US20120035660A1 - Dynamic stabilization connecting member with pre-tensioned solid core - Google Patents
Dynamic stabilization connecting member with pre-tensioned solid core Download PDFInfo
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- US20120035660A1 US20120035660A1 US13/317,158 US201113317158A US2012035660A1 US 20120035660 A1 US20120035660 A1 US 20120035660A1 US 201113317158 A US201113317158 A US 201113317158A US 2012035660 A1 US2012035660 A1 US 2012035660A1
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- core
- sleeve
- bone
- spacer
- bumper
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
- A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
- A61B17/7002—Longitudinal elements, e.g. rods
- A61B17/7019—Longitudinal elements having flexible parts, or parts connected together, such that after implantation the elements can move relative to each other
- A61B17/7026—Longitudinal elements having flexible parts, or parts connected together, such that after implantation the elements can move relative to each other with a part that is flexible due to its form
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
- A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
- A61B17/7002—Longitudinal elements, e.g. rods
- A61B17/7004—Longitudinal elements, e.g. rods with a cross-section which varies along its length
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
- A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
- A61B17/7002—Longitudinal elements, e.g. rods
- A61B17/7019—Longitudinal elements having flexible parts, or parts connected together, such that after implantation the elements can move relative to each other
- A61B17/702—Longitudinal elements having flexible parts, or parts connected together, such that after implantation the elements can move relative to each other having a core or insert, and a sleeve, whereby a screw or hook can move along the core or in the sleeve
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
- A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
- A61B17/7035—Screws or hooks, wherein a rod-clamping part and a bone-anchoring part can pivot relative to each other
- A61B17/7037—Screws or hooks, wherein a rod-clamping part and a bone-anchoring part can pivot relative to each other wherein pivoting is blocked when the rod is clamped
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
- A61B17/7049—Connectors, not bearing on the vertebrae, for linking longitudinal elements together
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
- A61B17/7049—Connectors, not bearing on the vertebrae, for linking longitudinal elements together
- A61B17/705—Connectors, not bearing on the vertebrae, for linking longitudinal elements together for linking adjacent ends of longitudinal elements
Definitions
- the present invention is directed to dynamic fixation assemblies for use in bone surgery, particularly spinal surgery, and in particular to longitudinal connecting members for such assemblies, the connecting members being attached to at least two bone fasteners.
- longitudinal connecting members have been designed that are of a material, size and shape to largely resist flexure, extension, torsion, distraction and compression, and thus substantially immobilize the portion of the spine that is to be fused.
- longitudinal connecting members are typically uniform along an entire length thereof, and usually made from a single or integral piece of material having a uniform diameter or width of a size to provide substantially rigid support in all planes.
- Such a cord or strand may be threaded through cannulated spacers that are disposed between adjacent bone anchors when such a cord or strand is implanted, tensioned and attached to the bone anchors.
- the spacers typically span the distance between bone anchors, providing limits on the bending movement of the cord or strand and thus strengthening and supporting the overall system.
- Such cord or strand-type systems require specialized bone anchors and tooling for tensioning and holding the cord or strand in the bone anchors.
- the cords or strands utilized in such systems do not allow for elastic distraction of the system once implanted because the cord or strand must be stretched or pulled to maximum tension in order to provide a stable, supportive system.
- the complex dynamic conditions associated with spinal movement create challenges for the design of elongate elastic longitudinal connecting members that exhibit an adequate fatigue strength to provide stabilization and protected motion of the spine, without fusion, and that allow for some natural movement of the portion of the spine being reinforced and supported by the elongate elastic or flexible connecting member.
- a further challenge are situations in which a portion or length of the spine requires a more rigid stabilization, possibly including fusion, while another portion or length may be better supported by a more dynamic system that allows for protective movement.
- a longitudinal connecting member assembly according to the invention for use between at least two bone attachment structures or anchors provide dynamic, protected motion of the spine.
- a longitudinal connecting member assembly according to the invention has an inner pre-tensioned core of circular or non-circular cross-section that is integral or otherwise fixed to a first bone anchor attachment portion.
- At least one elastic spacer surrounds the core and is slidable along the core at a location between a pair of adjacent bone anchors.
- At least one outer sleeve also surrounds the core and is in sliding relationship with the core. The outer sleeve also engages at least one bone anchor.
- the inner core and outer elastic spacer cooperate dynamically, with the outer sleeve being in compression while the core is in tension.
- the assembly may further include an elastic end bumper that also is in compression and places distractive force on the core.
- an improved medical implant assembly having at least two bone anchor attachment structures cooperating with a longitudinal connecting member, including an anchor member portion that is in engagement with one of the at least two bone anchor attachment structures, at least one compressible outer spacer, and at least one sleeve.
- the anchor member portion has a pre-tensioned member portion of reduced diameter that extends from an end thereof.
- the pre-tensioned member portion is received in the spacer, and the spacer is positioned between the at least two bone anchor attachment structures.
- the pre-tensioned member portion is also received within the sleeve and in slidable relationship therewith.
- the sleeve is in engagement with the other of the at least two bone anchor attachment structures.
- the improvement may further include an elastic bumper that engages the sleeve and receives the pre-tensioned member portion therein.
- the improvement may further include a fixation structure that is secured to the pre-tensioned member portion at an end thereof opposite the anchor member portion.
- an improved medical implant assembly having at least two bone attachment structures cooperating with a longitudinal connecting member
- the longitudinal connecting member includes an anchor member portion in engagement with one of the at least two bone attachment structures, the anchor member portion having a pre-tensioned bendable core extension of reduced diameter along a length thereof, the core extension attached to and extending from the anchor member portion and having a linear and a non-linear configuration; at least one compressible outer spacer, the core extension being received in the spacer, the spacer being positioned between the at least two bone attachment structures; and at least one sleeve, the core extension being received within the sleeve and in slidable relationship therewith, the sleeve being in engagement with the other of the at least two bone attachment structures.
- an improved medical implant assembly having at least two bone anchor attachment structures cooperating with a longitudinal connecting member
- the longitudinal connecting member includes an anchor member portion in engagement with one of the at least two bone anchor attachment structures, the anchor member portion having a pre-tensioned member portion of reduced diameter extending from an end thereof; at least one compressible outer spacer, the pre-tensioned member portion being received in the spacer, the spacer being positioned between the at least two bone anchor attachment structures; and at least one sleeve, the pre-tensioned member portion being received within the sleeve and in slidable relationship therewith, the sleeve being in engagement with the other of the at least two bone anchor attachment structures.
- the longitudinal connecting member also includes one or more of an elastic bumper and a fixation structure. Further, the pre-tensioned member portion is fixed to the anchor member portion at an end thereof, in some embodiments.
- a medical implant assembly having at least two bone attachment structures cooperating with a longitudinal connecting member
- the longitudinal connecting member includes an anchor member portion in engagement with one of the at least two bone attachment structures, the anchor member portion having a pre-tensioned bendable core extension of reduced diameter along a length thereof, the core extension attached to and extending from the anchor member portion and having a linear and a non-linear configuration; at least one compressible outer spacer, the core extension being received in the spacer, the spacer being positioned between the at least two bone attachment structures; and at least one sleeve, the core extension being received within the sleeve and in slidable relationship therewith, the sleeve being in engagement with the other of the at least two bone attachment structures.
- a medical implant assembly including a longitudinal connecting member having a stiff portion secured to at least a first bone attachment structure, the stiff portion being coaxial with a less stiff core extension portion of reduced width relative to the stiff portion, the core extension being in slidable relation with at least a second end bone attachment structure; at least one solid non-slitted outer spacer positioned entirely outside of the core extension and between the at least first and second end bone attachment structures, the spacer being in slidable relation with the core extension; and at least one end fixing structure and at least one elastic bumper, both the end fixing structure and the elastic bumper being positioned entirely outside of the at least second end bone attachment structure, wherein the bumper is positioned around the core extension and between the fixing structure and the at least second end bone attachment structure, and wherein the bumper is in slidable relation with the core extension; and wherein the fixing structure is slidable on the core section, compressible against the bumper and securable to the core extension.
- the core extension is in tension. In some further embodiments, the core extension is maintained in tension by axial elastic distraction from the bumper. In some further embodiments, the core extension is made of at least one of a polymer, PEEK and a non-metal. In some further embodiments, at least one sleeve is positioned around and between the core extension and the bone attachment structure, the sleeve being secured to at least the bone attachment structure. In some further embodiments, the tensioned core extension is adapted to provide resilient bending stiffness for the longitudinal connecting member while cooperating with the bone attachment structures. In some further embodiments, the end fixing structure is positioned entirely outside of the bumper. In some further embodiments, the bumper and the spacer are positioned entirely outside of the sleeve.
- An object of the invention is to provide dynamic medical implant stabilization assemblies having longitudinal connecting members that include a pre-tensioned inner core that allows for some bending, torsion, compression and distraction of the assembly. Another object of the invention is to provide such an assembly including an elastic pre-compressed outer spacer or sleeve. A further object of the invention is to provide dynamic medical implant longitudinal connecting members that may be utilized with a variety of bone screws, hooks and other bone anchors. Additionally, it is an object of the invention to provide a lightweight, reduced volume, low profile assembly including at least two bone anchors and a longitudinal connecting member therebetween. Furthermore, it is an object of the invention to provide apparatus and methods that are easy to use and especially adapted for the intended use thereof and wherein the apparatus are comparatively inexpensive to make and suitable for use.
- FIG. 1 is an enlarged front elevational view of a dynamic fixation connecting member assembly according to the invention including an anchor member integral with an inner core, two elastic spacers, two sleeves, an elastic bumper and a crimping ring.
- FIG. 2 is a cross-sectional view taken along the line 2 - 2 of FIG. 1 .
- FIG. 3 is an enlarged perspective view of the anchor member of FIG. 1 .
- FIG. 4 is an enlarged perspective view of one of the sleeves of FIG. 1 .
- FIG. 5 is an enlarged perspective view of another of the sleeves of FIG. 1 .
- FIG. 6 is an enlarged exploded front elevational view of the assembly of FIG. 1 .
- FIG. 7 is an enlarged perspective view of the crimping ring of FIG. 1 .
- FIG. 8 is an enlarged perspective view of the elastic bumper of FIG. 1 .
- FIG. 9 is an enlarged front perspective view of an elastic spacer of FIG. 1 .
- FIG. 10 is an enlarged rear perspective view of the elastic spacer of FIG. 9 .
- FIG. 11 is an enlarged front perspective view of another elastic spacer of FIG. 1 .
- FIG. 12 is an enlarged rear perspective view of the elastic spacer of FIG. 11 .
- FIG. 13 is a reduced front elevational view of the assembly of FIG. 1 shown with three cooperating bone screws.
- FIG. 14 is an enlarged front elevational view of a second embodiment of a dynamic fixation connecting member assembly according to the invention including an anchor member integral with an inner core, an elastic spacer, a sleeve, an elastic bumper and a crimping ring.
- FIG. 15 is a reduced exploded front elevational view of the assembly of FIG. 14 .
- FIG. 16 is a cross-sectional view taken along the line 16 - 16 of FIG. 14 .
- FIG. 17 is a reduced front elevational view of the assembly of FIG. 14 shown with three cooperating bone screws.
- FIG. 18 is front elevational view of a third embodiment of a dynamic fixation connecting member assembly according to the invention shown with four cooperating bone screws.
- FIG. 19 is a front elevational view of a fourth embodiment of a dynamic fixation connecting member assembly according to the invention with portions broken away to show the detail thereof.
- FIG. 20 is a front elevational view of a fifth embodiment of a dynamic fixation connecting member assembly according to the invention with an inner threaded core shown in phantom.
- FIG. 21 is a front elevational view of a sixth embodiment of a dynamic fixation connecting member assembly according to the invention.
- FIG. 22 is a reduced exploded front elevational view of the connecting member of FIG. 21 .
- FIG. 23 is a reduced cross-sectional view taken along the line 23 - 23 of FIG. 21 .
- FIG. 24 is a front elevational view of a seventh embodiment of a dynamic fixation connecting member assembly according to the invention shown with three bone screws.
- FIG. 25 is an enlarged perspective view of an eighth embodiment of a dynamic fixation connecting member assembly according to the invention including an anchor member integral with an inner core, an elastic spacer, a sleeve, an elastic bumper and a crimping member.
- FIG. 26 is a cross-sectional view taken along the line 26 - 26 of FIG. 25 .
- FIG. 27 is an enlarged exploded front elevational view of the assembly of FIG. 25 .
- FIG. 28 is an enlarged perspective view of the anchor member of FIG. 25 .
- FIG. 29 is an enlarged side elevational view of the anchor member of FIG. 25 .
- FIG. 30 is an enlarged perspective view of the spacer of FIG. 25 .
- FIG. 31 is an enlarged side elevational view of the spacer of FIG. 25 .
- FIG. 32 is an enlarged perspective view of the sleeve of FIG. 25 .
- FIG. 33 is an enlarged side elevational view of the sleeve of FIG. 25 .
- FIG. 34 is an enlarged perspective view of the elastic bumper of FIG. 25 .
- FIG. 35 is an enlarged side elevational view of the elastic bumper of FIG. 25 .
- FIG. 36 is an enlarged perspective view of the crimping member of FIG. 25 .
- FIG. 37 is an enlarged side elevational view of the crimping member of FIG. 25 .
- FIG. 38 is an enlarged front elevational view of the assembly of FIG. 25 shown with two cooperating bone screws with portions broken away to show the detail thereof.
- FIG. 39 is an enlarged perspective view of a ninth embodiment of a dynamic fixation connecting member assembly according to the invention including an anchor member integral with an inner core, an elastic spacer with a trapezoidal face, a sleeve, an elastic bumper and a crimping member.
- FIG. 40 is a reduced exploded perspective view of the assembly of FIG. 39 .
- FIG. 41 is an enlarged front elevational view of the elastic spacer of FIG. 39 .
- FIG. 42 is an enlarged side elevational view of the elastic spacer of FIG. 39 .
- FIG. 43 is an enlarged and partial front elevational view of the assembly of FIG. 39 shown cooperating with a pair of bone screws.
- FIG. 44 is an enlarged and partial front elevational view similar to FIG. 43 showing the assembly in a loaded condition.
- FIG. 45 is an enlarged front elevational view of a tenth embodiment of a dynamic fixation connecting member assembly according to the invention including an anchor member integral with an inner core, a first elastic spacer with a trapezoidal face, a first sleeve, a second elastic spacer, a second sleeve, an elastic bumper and a crimping member.
- FIG. 46 is an enlarged front elevational view similar to FIG. 45 with portions broken away to show the detail thereof.
- FIG. 47 is an enlarged perspective view of the first sleeve of FIG. 45 .
- FIG. 48 is an enlarged and partial perspective view of the assembly of FIG. 45 shown cooperating with three bone screws and with portions broken away to show the detail thereof.
- FIG. 49 is an enlarged and partial perspective view similar to FIG. 48 showing the assembly of FIG. 45 under a load.
- FIG. 50 is an enlarged perspective view of an eleventh embodiment of a dynamic fixation connecting member assembly according to the invention including an anchor member integral with an inner core, a first elastic spacer with a trapezoidal face, a first sleeve, a second elastic spacer with a trapezoidal face, a second sleeve, an elastic bumper and a crimping member.
- FIG. 51 is a reduced and partial front elevational view of the assembly of FIG. 50 shown cooperating with three bone screws.
- FIG. 52 is a partial front elevational view similar to FIG. 51 showing the assembly of FIG. 50 under a load.
- the reference numeral 1 generally designates a non-fusion dynamic stabilization longitudinal connecting member assembly according to the present invention.
- the connecting member assembly 1 includes an anchor member, generally 4 , having an elongate segment or inner core 6 and a bone anchor attachment portion 8 ; a first elastic spacer 10 ; a first sleeve 12 ; a second elastic spacer 14 ; a second sleeve 16 ; an elastic bumper 18 ; and a crimping ring 20 ; all substantially symmetrically aligned with respect to a central axis A of the anchor member 4 .
- the elongate core 6 of the anchor member 4 is receivable within the spacer 10 , the first sleeve 12 , the second spacer 14 , the second sleeve 16 , the bumper 18 and the crimping ring 20 .
- the axis A of the anchor member 4 is also the axis of the fully assembled assembly 1 .
- the inner core 6 is in tension and the spacers 10 and 14 and the bumper 18 are in compression.
- the dynamic connecting member assembly 1 cooperates with at least three bone anchors, such as the polyaxial bone screws, generally 25 and cooperating closure structures 27 , the assembly 1 being captured and fixed in place at the anchor portion 8 , the sleeve 12 and the sleeve 16 by cooperation between the bone screws 25 and the closure structures 27 .
- bone anchors such as the polyaxial bone screws
- the connecting member assembly 1 may be used with a wide variety of bone screws and other bone anchors already available for cooperation with more rigid rods including fixed, monoaxial bone screws, hinged bone screws, polyaxial bone screws, and bone hooks and the like, with or without compression inserts, that may in turn cooperate with a variety of closure structures having threads, flanges, or other structure for fixing the closure structure to the bone anchor, and may include other features, for example, external or internal drives, break-off tops and inner set screws.
- the bone anchors, closure structures and the connecting member assembly 1 are then operably incorporated in an overall spinal implant system for correcting degenerative conditions, deformities, injuries, or defects to the spinal column of a patient.
- the illustrated polyaxial bone screws 25 each include a shank 30 for insertion into a vertebra (not shown), the shank 30 being pivotally attached to an open receiver or head 31 .
- the shank 30 includes a threaded outer surface and may further include a central cannula or through-bore disposed along an axis of rotation of the shank.
- the through bore provides a passage through the shank interior for a length of wire or pin inserted into the vertebra prior to the insertion of the shank 30 , the wire or pin providing a guide for insertion of the shank 30 into the vertebra.
- the receiver 31 includes a pair of spaced and generally parallel arms that form an open generally U-shaped channel therebetween that is open at distal ends of such arms.
- the receiver arms each include radially inward or interior surfaces that have a discontinuous guide and advancement structure mateable with cooperating structure on the closure structure 27 .
- the guide and advancement structure may be a partial helically wound flangeform configured to mate under rotation with a similar structure on the closure structure 27 or a buttress thread, a square thread, a reverse angle thread or other thread like or non-thread like helically wound advancement structures for operably guiding under rotation and advancing the closure structure 27 downward between the receiver arms and having such a nature as to resist splaying of the receiver arms when the closure 27 is advanced between the receiver arms.
- the shank 30 and the receiver 31 may be attached in a variety of ways.
- a spline capture connection as described in U.S. Patent No. 6 , 716 , 214 , and incorporated by reference herein, may be used wherein the bone screw shank includes a capture structure mateable with a retaining structure disposed within the receiver.
- the retaining structure includes a partially spherical surface that is slidingly mateable with a cooperating inner surface of the receiver 31 , allowing for a wide range of pivotal movement between the shank 30 and the receiver 31 .
- polyaxial bone screws with other types of capture connections may also be used according to the invention, including but not limited to, threaded connections, frictional connections utilizing frusto-conical or polyhedral capture structures, integral top or downloadable shanks, and the like.
- polyaxial and other bone screws for use with connecting members of the invention may have bone screw shanks that attach directly to the connecting member or may include compression members or inserts that engage the bone screw shank and cooperate with the shank, the receiver and the closure structure to secure the connecting member assembly to the bone screw and/or fix the bone screw shank at a desired angle with respect to the bone screw receiver that holds the longitudinal connecting member assembly.
- closure structure 27 of the present invention is illustrated with the polyaxial bone screw 25 having an open receiver or head 31 , it foreseen that a variety of closure structure may be used in conjunction with any type of medical implant having an open or closed head or receiver, including monoaxial bone screws, hinged bone screws, hooks and the like used in spinal surgery.
- the threaded shank 30 may be coated, perforated, made porous or otherwise treated.
- the treatment may include, but is not limited to a plasma spray coating or other type of coating of a metal or, for example, a calcium phosphate; or a roughening, perforation or indentation in the shank surface, such as by sputtering, sand blasting or acid etching, that allows for bony ingrowth or ongrowth.
- Certain metal coatings act as a scaffold for bone ingrowth.
- Bio-ceramic calcium phosphate coatings include, but are not limited to: alpha-tri-calcium phosphate and beta-tri-calcium phosphate (Ca 3 (PO 4 ) 2 , tetra-calcium phosphate (Ca 4 P 2 O 9 ), amorphous calcium phosphate and hydroxyapatite (Ca 10 (PO 4 ) 6 (OH) 2 ).
- Coating with hydroxyapatite for example, is desirable as hydroxyapatite is chemically similar to bone with respect to mineral content and has been identified as being bioactive and thus not only supportive of bone ingrowth, but actively taking part in bone bonding.
- the closure structure 27 can be any of a variety of different types of closure structures for use in conjunction with the present invention with suitable mating structure on the interior surface of the upstanding arms of the receiver 31 .
- the illustrated closure structure 27 is rotatable between the spaced arms, but could be a slide-in closure structure.
- the illustrated closure structure 27 is substantially cylindrical and includes an outer helically wound guide and advancement structure in the form of a flange form that may take a variety of forms, including those described in Applicant's U.S. Pat. No. 6,726,689, which is incorporated herein by reference.
- closure structure guide and advancement structure could alternatively be a buttress thread, a square thread, a reverse angle thread or other thread like or non-thread like helically wound advancement structure for operably guiding under rotation and advancing the closure structure 27 downward between the receiver arms and having such a nature as to resist splaying of the arms when the closure structure 27 is advanced into the U-shaped channel formed by the arms.
- the illustrated closure 27 further includes an inner set screw with an internal drive in the form of an aperture utilized for assembly of the set screw and removal of the entire closure 27 .
- closure structure 27 may alternatively include an external drive, such as a break-off head designed to allow such a head to break from a base of the closure at a preselected torque, for example, 70 to 140 inch pounds.
- an external drive such as a break-off head designed to allow such a head to break from a base of the closure at a preselected torque, for example, 70 to 140 inch pounds.
- Such a closure structure would also include a base having an internal drive to be used for closure removal.
- the assembly 1 is elongate, with the inner core 6 being a substantially solid, smooth and uniform cylinder or rod having an outer cylindrical surface 36 and a substantially circular cross-section.
- the core 6 and integral anchor attachment portion 8 may be made from metal, metal alloys or other suitable materials, including plastic polymers such as polyetheretherketone (PEEK), ultra-high-molecular weight-polyethylene (UHMWP), polyurethanes and composites, including composites containing carbon fiber.
- PEEK polyetheretherketone
- UHMWP ultra-high-molecular weight-polyethylene
- composites including composites containing carbon fiber.
- the core 6 and the anchor attachment portion 8 may be made from different materials, for example, the core 6 may be made out of PEEK and fixed or adhered to a bone anchor attachment portion 8 made out of titanium.
- the core 6 and attachment portion 8 may include a small central lumen or through-bore (not shown) extending along the central axis A. Such a lumen may be used as a passage through the entire assembly 1 interior for a length of a guide wire for aiding insertion of the assembly 1 between implanted bone screws 25 in a percutaneous or less invasive procedure.
- the anchor member 4 is substantially cylindrical along an entire length thereof along the axis A and includes at least two or more circular cross-sections along the length thereof.
- the illustrated member 4 includes the slender and thus more flexible core 6 of a first circular cross-section and the bone anchor attachment portion 8 that has a second circular cross-section that is larger than the core 6 cross-section and thus is more rigid than the core 6 .
- the core 6 terminates at an end 38 .
- the core 6 Prior to final assembly, the core 6 is typically of a length greater than that shown in the drawing figures so that the core 6 may be grasped by a tool (not shown) near the end 38 and pulled along the axis A in a direction away from the anchor attachment portion 8 in order to place tension on the core 6 as will be described in greater detail below.
- a buttress plate 40 that has a third circular cross-section that is larger than the attachment portion 8 cross-section.
- the buttress plate 40 is integral with and disposed between the core 6 and the portion 8 .
- the illustrated anchor member 4 is substantially cylindrical, it is foreseen that the core 6 , the portion 8 and the plate 40 may have other forms, including but not limited to oval, square and rectangular cross-sections as well as other curved or polygonal shapes.
- the bone anchor attachment portion 8 is of a length along the axis A for cooperating with at least one and up to a plurality of bone attachment members, such as the bone screws 25 , hooks or other types of bone anchors.
- the portion 8 is substantially solid and rigid, with an outer cylindrical surface 39 that terminates at an end 41 .
- the plate 40 includes a first substantially flat and annular face 42 facing away from the core 6 and an opposed parallel substantially flat face 44 facing toward the core 6 .
- the faces 42 and 44 are disposed substantially perpendicular to the axis A.
- An outer cylindrical surface 46 extends between the faces 42 and 44 .
- a gently sloping transition surface or flange 48 bridges between and connects the outer cylindrical surface 36 of the core 6 with the substantially flat face 44 of the buttress plate 40 .
- the sleeves 12 and 16 are each sized and shaped to be slidingly received over the core 6 along the axis A and each have a length measured along the axis A that is sufficient for the attachment of at least one bone screw 25 thereon.
- the sleeves 12 and 16 may be made from metal, metal alloys or other suitable materials, including plastic polymers such as polyetheretherketone (PEEK), ultra-high-molecular weight-polyethylene (UHMWP), polyurethanes and composites, including composites containing carbon fiber.
- the sleeves 12 and 16 may be made of the same material as the cooperating core 6 , for example, the anchor member 4 and the sleeves 12 and 16 may all be made from PEEK; or, for example, the core 6 may be made from one material, such as PEEK, while the sleeves 12 and 16 may be made from another material, such as a metal (e.g. stainless steel or titanium).
- the sleeve 12 and 16 inner surfaces and/or cooperating core 6 outer surfaces may be coated with an ultra thin, ultra hard, ultra slick and ultra smooth coating, such as may be obtained from ion bonding techniques and/or other gas or chemical treatments.
- the illustrated sleeves 12 and 16 each are substantially cylindrical, having outer cylindrical bone anchor attachment surfaces 50 and 52 , respectively, that are each of substantially the same diameter as the outer surface 39 of the bone anchor attachment portion 8 .
- Each of the sleeves 12 and 16 further include an inner cylindrical surface 54 and 56 , respectively, that define a through-bore for the passage of the core 6 therethrough.
- the sleeve 12 includes a pair of integral, opposed end plates 58 and 60 while the sleeve 16 includes a single end plate 62 .
- the illustrated plates 58 , 60 and 62 have outer cylindrical surfaces 64 , 66 and 68 , respectively, that are of substantially the same diameter as the buttress plate outer cylindrical surface 46 .
- the plates 58 and 60 terminate at outer planar and annular surfaces 70 and 72 , respectively.
- the plate 62 terminates at an outer planar and annular surface 74 .
- the cylindrical surface 52 of the sleeve 16 terminates at an outer planar and annular surface 76 .
- the elastic spacers 10 and 14 and the elastic bumper 18 are sized and shaped to be slidingly received over the core 6 and may be made from a variety of elastic materials, including, but not limited to natural or synthetic elastomers such as polyisoprene (natural rubber), and synthetic polymers, copolymers, and thermoplastic elastomers, for example, polyurethane elastomers such as polycarbonate-urethane elastomers.
- the spacers 10 and 14 and bumper 18 inner and side surfaces may also be coated with an ultra thin, ultra hard, ultra slick and ultra smooth coating, such as may be obtained from ion bonding techniques and/or other gas or chemical treatments.
- the illustrated spacers 10 and 14 advantageously cooperate with the core 6 of the anchor member 4 , providing limitation and protection of movement of the core 6 located between bone screws 25 .
- the illustrated spacers 10 and 14 are almost identical, differing only with regard to inner surfaces that define through bores for receiving the anchor member core 6 .
- Each of the spacers 10 and 14 have an external substantially cylindrical outer surface 78 and 80 , respectively, and internal surfaces 82 and 84 , respectively, defining through bores.
- the internal surface 82 is further defined by a flared or conical outwardly extending surface 86 sized and shaped for cooperating with the surface 48 of the anchor member 4 .
- the spacer 10 includes opposed substantially planar and annular end surfaces 88 and 89 and the spacer 14 includes opposed substantially planar and annular end surfaces 90 and 91 .
- the end surfaces 88 and 89 and 90 and 91 are substantially perpendicular to the axis A.
- the spacers 10 and 14 may be of circular, square, rectangular or other cross-section including curved or polygonal shapes.
- both the spacers 10 and 14 further includes a compression groove 93 and 94 , respectively.
- Spacers according to the invention may include one, none or any desired number of grooves that allow for some additional compression of the spacers 10 and 14 when pressed upon in an axial direction by the plates 40 , 58 , 60 and 62 .
- the illustrated grooves 93 and 94 are substantially uniform and circular in cross-section, being formed in the respective external surfaces 78 and 80 and extending radially toward respective internal surfaces 82 and 84 .
- the size of the internal surfaces 82 and 84 allow for some axially directed sliding movement of the respective spacers 10 and 14 with respect to the core surface 36 .
- the core 6 and cooperating compressible spacers 10 and 14 allows for some twist or turn, providing some relief for torsional stresses.
- the spacers 10 and 14 and cooperating plates 40 , 58 , 60 and 62 may cooperate to limit such torsional movement as well as bending movement.
- a first set of pins may be inserted through the plates 40 and 60 and respective engaging spacer surfaces 89 and 88 .
- a second set of pins may be inserted through the plates 58 and 62 and respective engaging spacer surfaces 91 and 90 . It may be particularly advantageous to utilize pins made from tantalum, for example to provide x-ray markers, for example, when the anchor member 4 , sleeves and spacers are made from radiolucent plastics.
- the spacers 10 and 14 and cooperating plates 40 , 58 , 60 and 62 may include ribs or fins for insertion into apertures located on cooperating facing surfaces to provide limits on twisting movement between such plates and spacers.
- the bumper 18 is substantially cylindrical, including an outer surface 98 and an inner surface 99 forming a substantially cylindrical through bore that opens at planar end surfaces 100 and 101 and operatively extends along the axis A.
- the bumper 18 further includes a compression groove 104 that is similar in form and function to the compression grooves 93 and 94 described above with respect to the spacers 10 and 14 .
- the bumper 18 is sized and shaped to slidingly receive the core 6 through the inner surface 99 .
- the bumper 18 is preferably made from an elastomeric material such as polyurethane. The bumper 18 operatively provides axial tension on the core 6 as will be described in greater detail below.
- the crimping ring 20 is substantially cylindrical and includes an outer surface 110 and an inner surface 112 forming a substantially cylindrical through bore that opens at planar end surfaces 114 and 116 and operatively extends along the axis A.
- the crimping ring 20 is sized and shaped to receive the elongate core 6 through the inner surface 112 .
- the crimping ring 20 further includes a pair of crimp or compression grooves 120 that are pressable and deformable inwardly toward the axis A upon final tensioning of the core 6 and compression of the spacers 10 and 14 and the bumper 18 during assembly of the assembly 1 .
- the crimping ring 20 is preferably made from a stiff, but deformable material, including metals and metal alloys.
- the illustrated dynamic connecting member assembly 1 having a pre-tensioned core 6 cooperates with at least three bone anchors, such as polyaxial bone screws, generally 25 as shown in FIG. 13 .
- the three bone screws 25 are implanted into vertebrae (not shown).
- Each vertebra may be pre-drilled to minimize stressing the bone.
- each vertebra will have a guide wire or pin inserted therein that is shaped for the bone screw cannula of the bone screw shank 30 and provides a guide for the placement and angle of the shank 30 with respect to the cooperating vertebra.
- a further tap hole may be made and the shank 30 is then driven into the vertebra by rotation of a driving tool (not shown) that engages a driving feature on or near a top portion of the shank 30 . It is foreseen that both the screws 25 and the longitudinal connecting member assembly 1 may be inserted in a conventional, percutaneous or other minimally invasive surgical manner.
- the longitudinal connecting member assembly 1 is assembled to provide a pre-tensioned core 6 and pre-compressed spacers 10 and 14 and bumper 18 prior to implanting the assembly 1 in a patient. This is accomplished by first providing the anchor member 4 that has a core 6 that is longer in the axial direction A than the core 6 illustrated in the drawing figures.
- the spacer 10 is first loaded onto the core 6 by inserting the core 6 end 38 into the bore defined by the inner surface 82 with the face 89 directed toward the buttress plate 40 .
- the spacer 10 is moved along the core 6 until the surface 86 contacts the surface 48 .
- the sleeve 12 is then threaded onto the core 6 with the face 72 of the plate 60 facing the end surface 88 of the spacer 10 .
- the core 6 is received in the bore defined by the inner cylindrical surface 54 and the sleeve 12 is moved along the core 6 until the plate surface 72 abuts the spacer surface 88 .
- the spacer 14 is thereafter loaded onto the core 6 by inserting the core 6 end 38 into the bore defined by the inner surface 84 with the face 91 facing the toward the end plate 58 of the sleeve 12 .
- the spacer 14 is moved along the core 6 until the surface 91 contacts the surface 70 .
- the sleeve 16 is then threaded onto the core 6 with the face 74 of the plate 62 facing the end surface 90 of the spacer 14 .
- the core 6 is received in the bore defined by the inner cylindrical surface 56 and the sleeve 16 is moved along the core 6 until the plate surface 74 abuts the spacer surface 90 .
- the bumper 18 is thereafter loaded onto the core 6 by inserting the core 6 end 38 into the bore defined by the inner surface 99 with the face 101 facing the toward the surface 76 of the sleeve 16 .
- the bumper 18 is moved along the core 6 until the surface 101 contacts the surface 76 .
- the crimping ring 20 is thereafter loaded onto the core 6 by inserting the core 6 end 38 into the bore defined by the inner surface 112 with the face 116 facing the toward the surface 100 of the bumper 18 .
- the crimping ring 20 is moved along the core 6 until the surface 116 contacts the surface 100 . It is noted that due to the symmetrical nature of the sleeve 12 , the spacer 14 , the bumper 18 and the crimping ring 20 , these components may be loaded onto the core 6 from either side thereof.
- manipulation tools (not shown) are used to grasp the core 6 near the end 38 and at the bone anchor attachment portion 8 , placing tension on the core 6 .
- the spacer 10 , the sleeve 12 , the spacer 14 , the sleeve 16 , the bumper 18 and the crimping ring 20 are moved toward the buttress plate 40 and into contact with one another.
- Axial compressive force may also be placed on the components loaded on the core 6 , followed by deforming the crimping ring at the crimp grooves 120 and against the core 6 .
- the crimping ring 20 When the manipulation tools are released, the crimping ring 20 , now firmly and fixedly attached to the core 6 holds the spacers 10 and 14 and the bumper 18 in compression and the spacers and bumper place axial tension forces on the core 6 , resulting in a dynamic relationship between the core 6 and the spacers 10 , 14 and the bumper 18 .
- the tension on the core 6 is advantageously balanced and uniform as the spacers 10 and 16 are slidable with respect to the core 6 , but also are limited by the buttress plate of the anchor member 4 and end plates of the sleeves 12 and 16 .
- the bumper 18 that is compressed between the sleeve surface 76 and the crimping ring surface 116 is also slidable with respect to the core 206 .
- the spacers 10 and 14 and the bumper 18 place a distractive force on the core 6 along the axis A and between the buttress plate 40 and the crimping ring 20 , but also are movable with respect to the core 6 , thus being able to respond to jolting and other body movements and thereafter spring back into an originally set location.
- the sleeves 12 and 16 that may compress slightly, but are more rigid than the spacers 10 and 14 , keep the spacers 10 and 14 in an approximate desired axially spaced relation.
- the spacers 10 and 14 also advantageously slide along the core 6 in response to outside forces.
- the core 6 is then trimmed to be approximately flush with the end surface 114 of the crimping ring 20 .
- the pre-loaded connecting member assembly 1 is eventually positioned in an open, percutaneous or other less invasive manner in cooperation with the at least three bone screws 25 with the spacers 10 and 14 being disposed between and spaced from the bone screws 25 and with the portion 8 and sleeves 12 and 16 each being located within a U-shaped channel of a cooperating bone screw receiver 31 .
- a closure structure 27 is then inserted into and advanced between the arms of each of the bone screw receivers 31 until appropriately tightened.
- the assembly 1 is thus substantially dynamically loaded and oriented relative to the cooperating vertebra, providing relief (e.g., shock absorption) and protected movement with respect to flexion, extension, distraction and compressive forces placed on the assembly 1 and the three connected bone screws 25 .
- the slender core 6 allows for some twisting or turning, providing some relief for torsional stresses.
- the compressed spacers 10 and 14 place some limits on torsional movement as well as bending movement, to provide spinal support.
- the pre-loaded core 6 (in tension) and spacers 10 , 14 and bumper 18 (in compression) allow for compression and some extension of the assembly 1 located between the two bone screws 25 , e.g., shock absorption.
- disassembly is accomplished by using the driving tool (not shown) with a driving formation cooperating with the closure structure 27 internal drive or cooperating set screw internal drive to rotate and remove the closure structure 27 from the receiver 31 . Disassembly is then accomplished in reverse order to the procedure described previously herein for assembly.
- the connecting member assembly 1 may be removed and replaced with another longitudinal connecting member, such as a solid rod, having the same diameter as the portion 8 and the sleeves 12 and 16 , utilizing the same receivers 31 and the same or similar closure structures 27 .
- another longitudinal connecting member such as a solid rod
- a less rigid, more flexible assembly for example, an assembly 1 having components made of a more flexible material, but with the same diameter sleeves as the assembly 1 , may replace the assembly 1 , also utilizing the same bone screws 25 .
- an alternative embodiment of a dynamic longitudinal connecting member includes an anchor member, generally 204 , having an elongate segment or inner core 206 and a bone anchor attachment portion 208 ; an elastic spacer 210 ; a sleeve 216 ; an elastic bumper 218 ; and a crimping ring 220 ; all substantially symmetrically aligned with respect to a central axis B of the anchor member 204 .
- the elongate core 206 of the anchor member 204 is receivable within the spacer 210 , the sleeve 216 , the bumper 218 and the crimping ring 220 .
- the axis B of the anchor member 204 is also the axis of the fully assembled assembly 201 .
- the inner core 206 is in tension and the spacer 210 and the bumper 218 are in compression.
- the anchor member 204 is substantially similar to the anchor member 4 previously described herein with respect to the assembly 1 . Therefore, the member 204 includes the core 206 , the bone anchor attachment portion 208 and an integral buttress plate 240 identical or substantially similar in size and shape to the respective core 6 , attachment portion 8 and buttress plate 40 of the anchor member 4 previously described herein.
- the member 204 differs from the member 4 only in the length of the bone anchor attachment portion 208 .
- the portion 208 is longer than the similar portion 8 of the member 4 such that at least two bone screws 25 are attachable to the portion 208 as illustrated in FIG. 17 while only one bone screw 25 is attached to the portion 8 of the assembly 1 .
- the spacer 210 is identical or substantially similar to the spacer 10 illustrated in FIGS.
- the sleeve 216 is identical or substantially similar to the sleeve 16 illustrated in FIG. 4 and previously described herein, having an outer cylindrical surface 252 , an inner cylindrical surface 256 defining a through bore and an end plate 262 identical or substantially similar to the respective outer cylindrical surface 52 , inner cylindrical surface 56 and end plate 62 of the sleeve 16 previously described herein.
- the bumper 218 and the crimping ring 220 are identical or substantially similar to the respective bumper 18 and the crimping ring 20 previously described herein with respect to the assembly 1 .
- the assembly 201 is assembled in a manner substantially similar to the manner of assembly previously described herein with respect to the assembly 1 , the assembly 201 however, does not include a second spacer or second sleeve. Therefore, the core 206 is first received within a through bore of the spacer 210 , then within the inner cylindrical surface 256 of the sleeve 216 , followed by an inner through bore of the bumper 218 and then an inner through bore of the crimping ring 220 . Similar to what has been described previously with respect to the assembly 1 , the core 206 is initially of a longer length measured along the axis B than is shown in the drawing figures, allowing for a manipulation tool to grasp the core 206 near an end thereof that extends through the crimping ring bore.
- the core 206 is tensioned and/or the spacer 210 and bumper 220 are compressed, followed by deformation of the crimping ring 220 against the core 206 .
- the core 206 is then trimmed substantially flush to the crimping ring 220 .
- the assembly is now in dynamic relationship with the core 206 being in tension while the spacer 210 that is slidable with respect to the core 206 is compressed between the plates 240 and 262 and the bumper 218 that is also slidable with respect to the core 206 is compressed between the sleeve 216 and the crimping ring 220 ; the spacer 210 and the bumper 218 placing a distractive force on the core 206 along the axis B and between the buttress plate 240 and the crimping ring 220 .
- the assembly 201 may then be implanted, cooperating with three bone screws 25 as illustrated in FIG. 17 and as previously described herein with respect to the assembly 1 . Unlike the assembly 1 illustrated in FIG.
- the assembly 201 provides for dynamic stabilization between first and second bone screws 25 and a more rigid connection between the second bone screw 25 and a third bone screw 25 as both the second and third bone screws are attached to the rigid attachment portion 208 .
- the assembly 301 includes an anchor member 304 having an inner core 306 and a bone anchor attachment portion 308 ; a spacer 310 , a sleeve 316 , a bumper 318 and a crimping ring 320 .
- the illustrated spacer 310 , sleeve 316 , bumper 318 and crimping ring 320 are identical to the spacer 210 , sleeve 216 , bumper 218 and crimping ring 220 previously described herein with respect to the assembly 201 .
- the anchor member 304 is identical to the anchor member 204 with the exception that the bone anchor attachment portion 308 is of a length to receive three bone screw receivers 31 therealong while the portion 208 is sized to receive two bone screw receivers 31 .
- longitudinal connecting member assemblies according to the invention may be of a variety of lengths for cooperation with a plurality of bone screws 25 , either along a rigid end portion, such as the portion 308 shown in FIG. 18 , or along dynamic portions that include one or more spacers and one or more sleeves, such as the sleeves 12 and 16 for attachment to bone screws 25 or other bone anchors. It is foreseen that such sleeves may also be a variety of lengths for attachment to one or more bone anchors along a length of the individual sleeve.
- FIGS. 19 and 20 fourth and fifth embodiments of a dynamic longitudinal connecting member assembly of the invention are illustrated.
- an assembly 1 ′ is illustrated that is substantially similar to the assembly 1 previously described herein with an anchor member, generally 4 ′, having an inner core extension 6 ′ fixed to a bone anchor attachment portion 8 ′; spacers 10 ′ and 14 ′; sleeves 12 ′ and 16 ′; a bumper 18 ′ and a crimping ring 20 ′, all aligned along an axis A′.
- the illustrated spacers 10 ′ and 14 ′, sleeves 12 ′ and 16 ′, bumper 18 ′ and crimping ring 20 ′ are identical or substantially similar to the respective spacers 10 and 14 , sleeves 12 and 16 , bumper 18 and crimping ring 20 of the assembly 1 .
- the embodiment 1 ′ differs from the assembly 1 only in how the core extension 6 ′ is fixed to the bone anchor attachment portion 8 ′.
- the attachment portion 8 ′ includes a threaded aperture T and the core extension 6 ′ includes an outer threaded portion 36 ′ that mates with the threaded aperture T, fixing the core extension 6 ′ to the portion 8 ′ upon rotation of the core extension 6 ′ about the axis A′ within the aperture T.
- an assembly 201 ′ is shown that is substantially similar to the assembly 201 illustrated in FIGS. 14-17 .
- the assembly 201 ′ includes an anchor member, generally 204 ′, having an inner core extension 206 ′ fixed to a bone anchor attachment portion 208 ′; a spacer 210 ′; a sleeve 216 ′; a bumper 218 ′ and a crimping ring 220 ′, all aligned along an axis B′.
- the illustrated spacer 210 ′, sleeve 216 ′, bumper 218 ′ and crimping ring 220 ′ are identical or substantially similar to the respective spacer 210 , sleeve 216 , bumper 218 and crimping ring 220 of the assembly 201 .
- the embodiment 201 ′ differs from the assembly 201 only in how the core extension 206 ′ is fixed to the bone anchor attachment portion 208 ′.
- the attachment portion 208 ′ includes a threaded aperture T′ and the core extension 206 ′ includes an outer threaded portion 236 ′ that mates with the threaded aperture T′, fixing the core extension 206 ′ to the portion 208 ′ upon rotation of the core extension 206 ′ about the axis B′ within the aperture T′.
- the aperture T shown in FIG. 19 extends completely through the portion 8 ′ while the aperture T′ shown in FIG. 20 extends substantially into the portion 208 ′ along the axis B′, but does not extend therethrough.
- an assembly 401 is shown that includes the same or similar components to the assemblies 1 and 201 , for example, previously described herein. However, the components are sized such that the resulting assembly 401 has a constant outer diameter along an entire length thereof.
- the assembly 401 generally designates a non-fusion dynamic stabilization longitudinal connecting member assembly according to the present invention having an anchor member, generally 404 , that includes an elongate segment or inner core 406 integral with or otherwise fixed to a bone anchor attachment portion 408 ; an end spacer or stop 410 ; a second elastic spacer 411 ; a rigid sleeve 412 ; and a crimping ring 420 ; all substantially symmetrically aligned with respect to a central axis of the anchor member 404 .
- the elongate core 406 of the anchor member 404 is receivable within the spacers 410 and 411 , the sleeve 412 and the crimping ring 420 .
- the central axis of the anchor member 404 is also the axis of the fully assembled assembly 401 .
- the core 406 may be made of a slightly longer length and an elastic bumper, similar to the bumper 18 of the assembly 1 (but of a different inner diameter, such as the bumper 418 ′ shown in FIG. 24 ) may be placed between the sleeve 412 and the crimping ring 420 .
- the core 406 , anchor attachment portion 408 , spacers 410 and 411 , sleeve 412 and crimping ring 420 are substantially similar in form and function to the respective core 6 , anchor attachment portion 8 , spacer 10 , sleeve 12 and crimping ring 20 of the assembly 1 .
- the two spacers 410 and 411 may be made out of the same or different materials. For example, it may be desirable to make the spacer 410 of a more rigid material than the spacer 411 to provide more of a stop or barrier between the anchor attachment portion 408 and the spacer 411 in light of the reduced size of the components of the assembly 401 as compared to the assembly 1 and the fact that the assembly 401 does not include a buttress plate such as the buttress plate 40 of the assembly 1 . It is foreseen that in certain embodiments of the invention, the two spacers 410 and 411 may be replaced by a single spacer.
- the anchor attachment portion 408 and the core 406 may be configured in a more abrupt or stepped manner, forming a small stop or abutment surface disposed perpendicular to the central axis of the anchor member 404 .
- the assembly 404 when fully assembled, has the inner core 406 in tension and at least the spacer 411 in compression, with the ring 420 crimped against the core 406 .
- the dynamic connecting member assembly 401 cooperates with at least two bone anchors (not shown), such as the anchors 25 , the anchors being attached to the portion 408 and the rigid sleeve 412 .
- an assembly 401 ′ is shown that is substantially similar to the assembly 401 .
- the assembly 401 ′ differs from the assembly 401 only that the assembly 401 ′ includes a bumper 418 ′, a pair of spacers 411 ′ identical or substantially similar to the spacer 411 and a pair of rigid sleeves 412 ′ identical or substantially similar to the sleeve 412 , allowing for a bone screw 25 to be attached to each sleeve 412 ′ as well as to the anchor portion 408 ′, for a total of at least three bone screws 25 .
- One spacer 411 ′ is disposed between each bone screw 25 .
- the assembly 401 ′ includes an anchor member 404 ′ that includes an elongate segment or inner core (not shown, but substantially similar to the core 406 shown in FIG. 22 ) and an integral bone anchor attachment portion 408 ′; an end spacer or stop 410 ′; a pair of elastic spacers 411 ′; a pair of rigid sleeves 412 ′; and a crimping ring 420 ′; all substantially symmetrically aligned with respect to a central axis of the anchor member 404 ′.
- the elongate core of the anchor member 404 ′ is receivable within the end spacer 410 ′, the spacers 411 ′, the sleeves 412 ′ and the crimping ring 420 ′ as well as the elastic bumper 418 ′ that is similar in form and function to the bumper 18 of the assembly 1 .
- the anchor member 404 ′, spacers 411 , sleeve 412 , bumper 418 ′ and crimping ring 420 are substantially similar in form and function to the respective anchor member 4 , spacer 10 , sleeve 12 , bumper 18 and crimping ring 20 of the assembly 1 .
- the assembly 401 ′ end spacer or stop 410 ′ may be elastic like the spacers 411 ′ or may be made of a more rigid material in order to function in a manner similar to the buttress plate 40 of the assembly 1 .
- the reference numeral 501 generally designates another embodiment of a non-fusion dynamic stabilization longitudinal connecting member assembly according to the present invention.
- the connecting member assembly 501 includes an anchor member, generally 504 , having an elongate segment or inner core or core extension 506 and a bone anchor attachment portion 508 ; an elastic spacer 510 ; a sleeve 512 ; an elastic bumper 518 ; and a crimping member 520 ; all substantially symmetrically aligned with respect to a central axis AA of the anchor member 504 .
- the elongate core 506 of the anchor member 504 is receivable within the spacer 510 , the sleeve 512 , the bumper 518 and the crimping member 520 .
- the axis AA of the anchor member 504 is also a central axis of the fully assembled assembly 501 .
- the inner core 506 is in tension and the spacer 510 and the bumper 518 are in compression.
- the dynamic connecting member assembly 501 cooperates with at least two bone anchors, such as the polyaxial bone screws, generally 525 and cooperating closure structures 527 , the assembly 501 being captured and fixed in place at the anchor portion 508 and the sleeve 512 by cooperation between the bone screws 525 and the closure structures 527 .
- All of the embodiments according to the invention illustrated in FIGS. 25-52 are shown with the same bone screws 525 and cooperating closure structures 527 , however, as more fully discussed below, a wide variety of bone anchors may be used with connecting members according to the invention.
- the connecting member assembly 501 may be used with a wide variety of bone screws and other bone anchors that closely receive the planar surfaces of the assembly 501 , including fixed, monoaxial bone screws, hinged bone screws, polyaxial bone screws, and bone hooks and the like, with or without compression inserts, that may in turn cooperate with a variety of closure structures having threads, flanges, or other structure for fixing the closure structure to the bone anchor, and may include other features, for example, external or internal drives, break-off tops and inner set screws.
- the bone anchors, closure structures and the connecting member assembly 501 are then operably incorporated in an overall spinal implant system for correcting degenerative conditions, deformities, injuries, or defects to the spinal column of a patient.
- the illustrated polyaxial bone screws 525 each include a shank 530 for insertion into a vertebra (not shown), the shank 530 being pivotally attached to an open receiver or head 531 .
- the shank 530 includes a threaded outer surface and may further include a central cannula or through-bore disposed along an axis of rotation of the shank.
- the through bore provides a passage through the shank interior for a length of wire or pin inserted into the vertebra prior to the insertion of the shank 530 , the wire or pin providing a guide for insertion of the shank 530 into the vertebra.
- the receiver 531 includes a pair of spaced and generally parallel arms that form an open squared off U-shaped channel therebetween that is open at distal ends of such arms.
- the receiver arms each include radially inward or interior surfaces that have a discontinuous guide and advancement structure mateable with cooperating structure on the closure structure 527 .
- the guide and advancement structure may be a partial helically wound flangeform configured to mate under rotation with a similar structure on the closure structure 527 or a buttress thread, a square thread, a reverse angle thread or other thread like or non-thread like helically wound advancement structures for operably guiding under rotation and advancing the closure structure 527 downward between the receiver arms and having such a nature as to resist splaying of the receiver arms when the closure 527 is advanced between the receiver arms.
- the shank 530 and the receiver 531 may be attached in a variety of ways.
- a threaded capture connection as described in U.S. Patent Pub. No. 2007/0055244, and incorporated by reference herein, may be used wherein the bone screw shank includes an outer helical thread mateable with an inner helical thread of a retaining structure disposed within the receiver.
- the shank 530 of the illustrated bone screw 525 is top loaded into the receiver 531 and includes an upper portion 536 that has a partially spherical surface that is slidingly mateable with a cooperating inner surface of the receiver 531 , allowing for a wide range of pivotal movement between the shank 530 and the receiver 531 .
- Top or bottom loaded polyaxial bone screws for use with the assembly 501 may include other types of capture connections, including but not limited to, other threadably connected, spline connected, or cam connected shank upper portions mateable with a retainer structure or ring that is in turn slidingly mateable with the inner surface of the receiver 531 , frictional connections utilizing frusto-conical or polyhedral capture structures, and other types of integral top or downloadable shanks.
- polyaxial and other bone screws for use with connecting members of the invention may have bone screw shanks that directly engage the elongate connecting member or, as illustrated, include at least one compression member, such as the lower insert 538 that includes a partially spherical base that engages the substantially spherical upper portion of the bone screw shank 536 and also engages the bone anchor attachment portion 508 or the sleeve 512 to securely hold the connecting member assembly 501 within the receiver 531 and/or cooperate with the closure structure 527 to fix the bone screw shank 530 at a desired angle with respect to the bone screw receiver 531 .
- the lower insert 538 that includes a partially spherical base that engages the substantially spherical upper portion of the bone screw shank 536 and also engages the bone anchor attachment portion 508 or the sleeve 512 to securely hold the connecting member assembly 501 within the receiver 531 and/or cooperate with the closure structure 527 to fix the bone screw shank 530 at a desired angle with respect to the bone screw receiver 5
- the insert 538 includes spaced parallel walls disposed perpendicular to a bottom seating surface for closely holding the flat surfaced anchor attachment portion 508 or the flat surfaced sleeve 512 at a location slightly spaced from the squared off opening of the receiver 531 .
- closure structure 527 for use with the assembly 501 of the present invention is illustrated with the polyaxial bone screw 525 having an open receiver or head 531 , it foreseen that a variety of closure structures may be used in conjunction with any type of medical implant having an open or closed head or receiver, including monoaxial bone screws, hinged bone screws, hooks and the like used in spinal surgery.
- the threaded shank 530 may be coated, perforated, made porous or otherwise treated.
- the treatment may include, but is not limited to a plasma spray coating or other type of coating of a metal or, for example, a calcium phosphate; or a roughening, perforation or indentation in the shank surface, such as by sputtering, sand blasting or acid etching, that allows for bony ingrowth or ongrowth.
- Certain metal coatings act as a scaffold for bone ingrowth.
- Bio-ceramic calcium phosphate coatings include, but are not limited to: alpha-tri-calcium phosphate and beta-tri-calcium phosphate (Ca 3 (PO 4 ) 2 , tetra-calcium phosphate (Ca 4 P 2 O 9 ), amorphous calcium phosphate and hydroxyapatite (Ca 10 (PO 4 ) 6 (OH) 2 ).
- Coating with hydroxyapatite for example, is desirable as hydroxyapatite is chemically similar to bone with respect to mineral content and has been identified as being bioactive and thus not only supportive of bone ingrowth, but actively taking part in bone bonding.
- the closure structure 527 can be any of a variety of different types of closure structures for use in conjunction with the present invention with suitable mating structure on the interior surface of the upstanding arms of the receiver 531 .
- the illustrated closure structure 527 is rotatable between the spaced arms, but it is foreseen that it could be a slide-in closure structure.
- the illustrated closure structure 527 is substantially cylindrical and includes an outer helically wound guide and advancement structure in the form of a flange form that may take a variety of forms, including those described in Applicant's U.S. Pat. No. 6,726,689, the disclosure of which is incorporated herein by reference.
- closure structure guide and advancement structure could alternatively be a buttress thread, a square thread, a reverse angle thread or other thread like or non-thread like helically wound advancement structure for operably guiding under rotation and advancing the closure structure 527 downward between the receiver arms and having such a nature as to resist splaying of the arms when the closure structure 527 is advanced into the squared off U-shaped channel formed by the arms.
- the closure 527 may further include an inner set screw with an internal drive in the form of an aperture utilized for assembly of the set screw and removal of the entire closure 527 .
- the closure structure may alternatively include a non-helically wound locking or cam structure that may also include a flanged lip.
- the closure structure 527 may alternatively include an external drive, such as a break-off head designed to allow such a head to break from a base of the closure at a preselected torque, for example, 70 to 140 inch pounds. Such a closure structure would also include a base having an internal drive to be used for closure removal.
- the closure 527 has a planar bottom surface that engages the insert 538 as well as the bone anchor portion 508 or the sleeve 512 for consistent secure locking of the polyaxial screw mechanism, the insert 538 pressing against the shank upper portion 536 that in turn presses against an inner surface of the receiver 531 .
- the closure structure may have a roughened or point and rim structure to aid in frictionally engaging the longitudinal connecting member.
- the assembly 501 is elongate, with the inner core 506 being a substantially solid, smooth and uniform bar of substantially square or rectangular cross-section.
- the core 506 may have a variety of cross-sectional geometries including polygonal and curvate. It is preferred that the cross-section be non-circular. However, a curvate cross-section, such as an oval or elliptical shape is acceptable.
- the non-circular shape of the core 506 advantageously provides for torsion control of the assembly whereas a similar assembly made with a core of a circular cross section may tend to slip or rotate with respect to the other components of the assembly 501 when the assembly 501 is placed under torsional forces.
- a connecting member may require further structure in the form of pegs, pins or adhesives to more firmly connect an anchor member (similar to the anchor 504 but with circular cross-section) with an outer spacer (similar to the spacer 510 but with circular cross-section), for example.
- the anchor attachment portion 508 may be made from metal, metal alloys or other suitable materials, including plastic polymers such as polyetheretherketone (PEEK), ultra-high-molecular weight-polyethylene (UHMWP), polyurethanes and composites, including composites containing carbon fiber. It is noted that although an anchor member 504 is illustrated in which the components 506 and 508 are integral, the core extension 506 and the anchor attachment portion 508 may be made from different materials, for example, the core extension 506 may be made out of PEEK and fixed or adhered to a bone anchor attachment portion 508 made out of titanium.
- the core 506 and attachment portion 508 each include a small central lumen or through-bore 540 extending along the central axis AA.
- the lumen 540 may be used as a passage through the entire assembly 501 interior for a length of a guide wire for aiding insertion of the assembly 501 between implanted bone screws 525 in a percutaneous or less invasive procedure.
- the anchor member 504 is substantially bar-shaped along an entire length thereof along the axis AA and includes at least two or more rectangular cross-sections along the length thereof.
- the illustrated member 504 includes the slender and thus more flexible core 506 of a first rectangular cross-section that is illustrated in the drawings as having a square cross-section with four outer planar surfaces 543 .
- the core 506 terminates at an end 544 .
- the core 506 Prior to final assembly, the core 506 is typically of a length greater than that shown in the drawing figures so that the core 6 may be grasped by a tool (not shown) near the end 544 and pulled along the axis AA in a direction away from the anchor attachment portion 508 in order to place tension on the core 506 .
- the core 506 may be grasped by a tool near the end 544 during compression of the spacer 510 and/or bumper 518 and crimping of the member 520 .
- the spacer 510 and bumper 518 expand along the axis AA, placing the core extension 506 in tension.
- the bone anchor attachment portion 508 that is integral with the core extension 506 has a second rectangular cross-section that is larger than the core 506 cross-section and thus the portion 508 is more rigid than the core 506 .
- a buttress plate 546 that has a rectangular cross-section that is larger than the cross-section of the attachment portion 508 .
- the buttress plate 546 is integral with and disposed between the core 506 and the portion 508 .
- the illustrated anchor member 504 is substantially rectangular, it is foreseen that the core 506 , the portion 508 and the plate 546 may have other forms, including but not limited to oval and square cross-sections as well as other curved or polygonal shapes.
- the bone anchor attachment portion 508 is of a length along the axis AA for cooperating with at least one and up to a plurality of bone attachment members, such as the bone screws 525 , hooks or other types of bone anchors.
- the portion 508 is substantially solid and rigid, with opposed planar surfaces 548 and perpendicular cooperating opposed planar surfaces 550 .
- the surfaces 548 and 550 terminate at an end 551 .
- a distance between the surfaces 548 is slightly greater than a distance between the surfaces 550 . This is advantageous in situations wherein a relatively stiff bar 508 is desired but space considerations such as vertebrae and tooling placement require a more slender elongate connector.
- the buttress plate 546 includes a first substantially flat and annular face 552 facing away from the core 506 and an opposed parallel substantially flat face 554 facing toward the core 506 .
- the faces 552 and 554 are disposed substantially perpendicular to the axis AA.
- An outer surface 556 of rectangular cross-section extends between the faces 552 and 554 .
- a gently sloping transition surface or flange 558 bridges between and connects the surfaces 543 of the core 506 with the substantially flat face 554 of the buttress plate 546 .
- the sleeve 512 is sized and shaped to be slidingly received over the core 506 along the axis AA and has a length measured along the axis AA that is sufficient for the attachment of at least one bone screw 525 thereon.
- the sleeve 512 may be made from metal, metal alloys or other suitable materials, including plastic polymers such as polyetheretherketone (PEEK), ultra-high-molecular weight-polyethylene (UHMWP), polyurethanes and composites, including composites containing carbon fiber.
- the sleeve 512 may be made of the same material as the cooperating core 506 , for example, the anchor member 504 and the sleeve 512 may be made from PEEK; or, for example, the core 506 may be made from one material, such as PEEK, while the sleeve 512 may be made from another material, such as a metal (e.g. stainless steel or titanium).
- the sleeve 512 inner surfaces and/or cooperating core 506 outer surfaces may be coated with an ultra thin, ultra hard, ultra slick and ultra smooth coating, such as may be obtained from ion bonding techniques and/or other gas or chemical treatments.
- the illustrated sleeve 512 has a rectangular cross-section taken perpendicular to the axis AA, having outer opposed planar anchor attachment surfaces 560 and cooperating perpendicular opposed planar attachment surfaces 562 .
- the illustrated sleeve 512 rectangular cross-section is identical or substantially similar to the rectangular cross-section formed by the surfaces 548 and 550 of the bone anchor attachment portion 508 .
- the sleeve 512 further includes inner opposed planar surfaces 564 and cooperating perpendicular opposed planar surfaces 566 that define a through-bore for the passage of the core 506 therethrough.
- the surfaces 564 and 566 are of substantially the same width (measured perpendicular to the axis AA) for being closely slidingly mateable with the surfaces 543 of the core 506 .
- the sleeve 512 further includes a plate 570 at an end thereof.
- the illustrated end plate 570 has a rectangular cross-section perpendicular to the axis AA partially defined by outer planar surfaces 574 .
- the surfaces 574 are sized and shaped to be identical or substantially similar to the surfaces 556 of the plate 546 of the anchor member 504 .
- the plate 570 has a planar surface 575 perpendicular to the axis AA and an opposed terminal planar surface 576 .
- the surfaces 560 and 562 terminate at an outer planar surface 578 .
- the elastic spacer 510 and the elastic bumper 518 are sized and shaped to be slidingly received over the core 506 and may be made from a variety of elastic materials, including, but not limited to natural or synthetic elastomers such as polyisoprene (natural rubber), and synthetic polymers, copolymers, and thermoplastic elastomers, for example, polyurethane elastomers such as polycarbonate-urethane elastomers.
- the spacer 510 and the bumper 518 inner and side surfaces may also be coated with an ultra thin, ultra hard, ultra slick and ultra smooth coating, such as may be obtained from ion bonding techniques and/or other gas or chemical treatments.
- the illustrated spacer 510 advantageously closely slidingly mates and cooperates with the core 506 of the anchor member 504 , providing limitation and protection of axial movement and torsional control of the core 506 located between bone screws 525 .
- the illustrated spacer 510 has a pair of opposed planar outer surface 580 and perpendicular opposed planar cooperating surfaces 582 .
- the surfaces 580 and 582 have an outer cross-section similar or identical in size to the plates 546 and 570 .
- the spacer 510 also includes inner surfaces 584 of substantially the same width forming a lumen or through bore of substantially rectangular cross-section with respect the axis AA.
- the cross-section is substantially square and slightly larger than the substantially square cross-section of the core 506 .
- the internal surfaces 584 are further defined by a flared outwardly extending surface 586 sized and shaped for cooperating with the surface 558 of the anchor member 504 .
- the spacer 510 includes opposed substantially planar end surfaces 588 and 589 .
- the flared surface 586 terminates at the end surface 588 .
- the end surfaces 588 and 589 are substantially perpendicular to the axis AA. It is foreseen that in some embodiments, the spacer 510 may be of circular, square, or other outer cross-sectional shapes including curved or polygonal shapes.
- the spacer 510 further includes a compression groove 590 .
- Spacers according to the invention may include one, none or any desired number of grooves 590 that allow for some additional compression of the spacer 510 when pressed upon in an axial direction by the plates 546 and 570 .
- the illustrated groove 590 is substantially uniform and formed in the external surfaces 580 and 582 and extending inwardly toward the internal surfaces 584 .
- the size of the internal surfaces 584 allow for some axially directed sliding movement of the spacer 510 with respect to the core surfaces 543 but limits any rotation of the spacer 510 about the axis AA and thus limits twisting movements between the anchor 504 , the sleeve 512 and the spacer 510 .
- the illustrated bumper 518 is substantially square in cross-section in an operational direction perpendicular to the axis AA.
- the bumper 518 includes outer planar surfaces 592 and an inner bore also of substantially square cross-section with respect to the axis AA, the bore formed by inner planar surfaces 594 sized and shaped to be slightly larger than the surfaces 543 defining the core 506 .
- the surfaces 592 and 594 terminate at planar end surfaces 596 and 598 that are operatively perpendicular to the axis AA.
- the bumper 518 further includes a compression groove 600 that is similar in form and function to the compression groove 590 described previously herein with respect to the spacer 510 .
- the bumper 518 is sized and shaped to slidingly receive the core 506 through the inner surface 594 .
- the bumper 518 is preferably made from an elastomeric material such as polyurethane.
- the bumper 518 operatively provides axial tension on the core 506 as will be described in greater detail below.
- the crimping member 520 is substantially square in cross-section taken in a direction perpendicular to the axis AA and includes four substantially planar outer surfaces 602 .
- Four planar inner surfaces 604 form a through bore also of substantially square cross-section, sized and shaped to closely slidingly receive the planar surfaces 543 of the core 506 along the axis AA.
- the surfaces 602 and 604 terminate at opposed planar end surfaces 606 and 608 .
- the crimping member 520 further includes a pair of opposed crimp or compression grooves 610 that are pressable and deformable inwardly toward the axis AA upon final tensioning of the core 506 and/or compression of the spacer 510 and the bumper 518 during assembly of the assembly 501 .
- the crimping member 520 is preferably made from a stiff, but deformable material, including, but not limited to, metals and metal alloys.
- the illustrated dynamic connecting member assembly 501 having a pre-tensioned core extension 506 cooperates with at least two bone anchors, such as the polyaxial bone screws, generally 525 as shown in FIG. 38 .
- the bone screws 525 are implanted into vertebrae (not shown).
- Each vertebra may be pre-drilled to minimize stressing the bone.
- each vertebra will have a guide wire or pin inserted therein that is shaped for the bone screw cannula of the bone screw shank 530 and provides a guide for the placement and angle of the shank 530 with respect to the cooperating vertebra.
- a further tap hole may be made and the shank 530 is then driven into the vertebra by rotation of a driving tool (not shown) that engages a driving feature on or near a top portion of the shank 530 . It is foreseen that both the screws 525 and the longitudinal connecting member assembly 501 may be inserted in a conventional, percutaneous or other minimally invasive surgical manner.
- the longitudinal connecting member assembly 501 is assembled to provide a pre-tensioned core 506 and pre-compressed spacer 510 and bumper 518 prior to implanting the assembly 501 in a patient. This is accomplished by first providing the anchor member 504 that has a core 506 that is longer in the axial direction AA than the core 506 illustrated in the drawing figures.
- the spacer 510 is first loaded onto the core 506 by inserting the core 506 end 544 into the bore defined by the inner surfaces 584 with the spacer end face 588 directed toward the buttress plate 546 .
- the spacer 510 is moved along the core 506 until the surface 586 contacts the surface 558 .
- the sleeve 512 is then threaded onto the core 506 with the face 576 of the plate 570 facing the end surface 589 of the spacer 510 .
- the core 506 is received in the bore defined by the inner planar surfaces 564 and 566 and the sleeve 512 is moved along the core 506 until the plate surface 576 abuts the spacer surface 589 .
- the bumper 518 is thereafter loaded onto the core 506 by inserting the core 506 end 544 into the bore defined by the inner surfaces 594 with the face 596 facing the toward the surface 578 of the sleeve 512 .
- the bumper 518 is moved along the core 506 until the surface 596 contacts the surface 578 .
- the crimping member 520 is thereafter loaded onto the core 506 by inserting the core 506 end 544 into the bore defined by the inner surfaces 604 with the face 606 facing the toward the surface 598 of the bumper 518 .
- the crimping member 520 is moved along the core 506 until the surface 606 contacts the surface 598 . It is noted that due to the symmetrical nature of the sleeve 512 , the spacer 514 , the bumper 518 and the crimping member 520 , these components may be loaded onto the core 506 from either side thereof.
- the bone anchor attachment portion 508 , the spacer 510 and the sleeve 512 are not of square cross-section, such components 508 , 510 and 512 are assembled on the core 506 in alignment with the surfaces 548 , 580 and 560 being loaded on the core to be in parallel planes. As illustrated in FIGS. 25 and 26 , in the illustrated embodiment, such alignment places the surfaces 548 and 560 in substantially the same plane. Likewise, such assembly places the surfaces 550 , 582 and 562 in parallel with the surfaces 550 and 562 being in substantially the same plane.
- manipulation tools are used to grasp the core 506 near the end 544 and at the bone anchor attachment portion 508 , placing tension on the core 506 .
- the spacer 510 , the sleeve 512 , the bumper 518 and the crimping member 520 are moved toward the buttress plate 540 and into contact with one another.
- axial compressive force is placed on the components loaded on the core 506 , followed by deforming the crimping member at the crimp grooves 610 and against the core 506 .
- the crimping member 520 When the manipulation tools are released, the crimping member 520 , now firmly and fixedly attached to the core 506 holds the spacer 510 and the bumper 518 in compression and the spacers and bumper place axial tension forces on the core 506 , resulting in a dynamic relationship between the core 506 and the spacer 510 and bumper 518 .
- the tension on the core 506 is advantageously balanced and uniform as the spacer 510 is slidable with respect to the core 506 , but also are limited by the buttress plate of the anchor member 504 and end plate of the sleeve 512 .
- the bumper 518 that is compressed between the sleeve surface 578 and the crimping member surface 606 is also slidable with respect to the core 506 .
- the spacer 510 and the bumper 518 place a distractive force on the core 506 along the axis AA and between the buttress plate 546 and the crimping member 520 , but also are movable with respect to the core 506 , thus being able to respond to jolting and other body movements and thereafter spring back into an originally set location.
- the sleeve 512 may compress slightly, but is more rigid than the spacer 510 and bumper 518 and thus keeps the spacers 510 and bumper 518 in an approximate desired axially spaced relation.
- the spacer 510 also advantageously slides along the core 506 in response to outside forces. The core 506 is then trimmed to be approximately flush with the end surface 608 of the crimping member 520 .
- the pre-loaded connecting member assembly 501 is eventually positioned in an open, percutaneous or other less invasive manner in cooperation with the at least two bone screws 525 with the spacer 510 being disposed between and spaced from the bone screws 525 and with the portion 508 and sleeve 512 each being located within a squared-off U-shaped channel of a cooperating bone screw receiver 531 .
- a closure structure 527 is then inserted into and advanced between the arms of each of the bone screw receivers 531 until appropriately tightened.
- the assembly 501 is thus substantially dynamically loaded and oriented relative to the cooperating vertebra, providing relief (e.g., shock absorption) and protected movement with respect to flexion, extension, distraction and compressive forces placed on the assembly 501 and the connected bone screws 525 .
- the slender core extension 506 allows for some twisting providing some relief for torsional stresses.
- the fact that the core 506 is of a non-round cross-section and cooperates with through bores of the other assembly components that are also non-round and closely slidingly mate with the core 506 also advantageously provides limits to rotational or twisting movement of the assembly 501 in response to torsional forces.
- the compressed spacer 510 places some limits on torsional movement as well as bending movement, to provide spinal support.
- the pre-loaded core 506 (in tension) and spacer 510 and bumper 518 (in compression) allow for compression and some extension of the assembly 501 located between the two bone screws 525 , e.g., shock absorption.
- disassembly is accomplished by using the driving tool (not shown) with a driving formation cooperating with the closure structure 527 internal drive or cooperating set screw internal drive to rotate and remove the closure structure 527 from the receiver 531 . Disassembly is then accomplished in reverse order to the procedure described previously herein for assembly.
- the connecting member assembly 501 may be removed and replaced with another longitudinal connecting member, such as a solid cylindrical or bar-like rod, having the same diameter or width as the width of the bar-like portion 508 and the sleeve 512 , utilizing the same receivers 531 and the same or similar closure structures 527 .
- another longitudinal connecting member such as a solid cylindrical or bar-like rod, having the same diameter or width as the width of the bar-like portion 508 and the sleeve 512 , utilizing the same receivers 531 and the same or similar closure structures 527 .
- a less rigid, more flexible assembly for example, an assembly 501 having components made of a more flexible material, but with the same size sleeves as the assembly 501 , may replace the assembly 501 , also utilizing the same bone screws 525 .
- a dynamic longitudinal connecting member of the invention includes an anchor member, generally 704 , having an elongate segment or inner core 706 and a bone anchor attachment portion 708 ; an elastic spacer 710 ; a sleeve 716 ; an elastic bumper 718 ; and a crimping member 770 ; all substantially symmetrically aligned with respect to a central curvate axis BB of the anchor member 704 as unlike the core 506 of the assembly 501 , the core 706 of the assembly 701 is bent primarily at a location near the portion 708 .
- the elongate core 706 of the anchor member 704 is receivable within the spacer 710 , the sleeve 716 , the bumper 718 and the crimping member 720 .
- the central curvate axis BB of the anchor member 704 is also the axis of the fully assembled assembly 701 .
- the anchor member 704 is substantially similar to the anchor member 504 previously described herein with respect to the assembly 501 . Therefore, the member 704 includes the core 706 , the bone anchor attachment portion 708 and an integral buttress plate 746 identical or substantially similar in size and shape to the respective core 506 , attachment portion 508 and buttress plate 546 of the anchor member 504 previously described herein. The member 704 differs from the member 504 only in the fact that the core 706 is bent adjacent the buttress plate 746 .
- the sleeve 712 is identical or substantially similar to the sleeve 512 illustrated in FIGS. 32 and 33 and previously described herein, having an outer planar surfaces 760 and 762 , inner planar surfaces 764 and 766 defining a through bore and an end plate 770 identical or substantially similar to the respective outer surfaces 560 and 562 , inner surfaces 564 and 566 and end plate 570 of the sleeve 512 previously described herein.
- the bumper 718 and the crimping member 720 are identical or substantially similar to the respective bumper 518 and the crimping member 520 previously described herein with respect to the assembly 501 .
- the spacer 710 is operatively located between the buttress plate 746 and the sleeve plate 770 in a manner similar to the spacer 510 located between the plates 546 and 570 of the assembly 501 .
- the spacer 710 is also made from materials similar to the materials from which the spacer 10 is made.
- the spacer 710 further includes inner planar surfaces 784 and a flanged surface 786 forming a through bore for receiving the core 706 , such surfaces 784 and 786 being substantially similar in form and function to the surfaces 584 and 586 previously described herein with respect to the spacer 510 with the exception that the through bore may be further modified to follow the curvature of the bent core 706 .
- the spacer 710 is of a different shape than the spacer 510 .
- the spacer 710 includes a pair of opposed planar surfaces 790 that are trapezoidal in shape.
- the surfaces 790 run parallel to the through bore formed by the planar surfaces 784 , such bore terminating at opposed load-bearing end surfaces 792 and 794 .
- the surfaces 792 and 794 are not parallel, each directed toward one another and terminating at a small top (operatively posterior with respect to the spine) surface 796 and sloping in a direction away from one another at a larger bottom (operatively anterior) surface 798 .
- the surface 796 may be placed in an anterior position and the surface 798 placed in a posterior position with respect to the spine if desired to correct spinal kyphosis.
- the core 706 and spacer 710 may be bent, sized and shaped for the correction of other spinal deformities, such as scoliosis, for example.
- the assembly 701 is assembled in a manner substantially similar to the manner of assembly previously described herein with respect to the assembly 501 . Therefore, the core 706 is first received within a through bore of the spacer 710 formed by the surfaces 784 , then within the inner planar surfaces 764 and 766 of the sleeve 712 , followed by an inner through bore of the bumper 718 and then an inner through bore of the crimping member 720 . Similar to what has been described previously with respect to the assembly 1 , the core 706 is initially of a longer length measured along the axis BB than is shown in the drawing figures, allowing for a manipulation tool to grasp the core 706 near an end thereof that extends through the crimping member bore.
- the core 706 is tensioned and/or the spacer 710 and bumper 720 are compressed, followed by deformation of the crimping member 720 against the core 706 .
- the core 706 is then trimmed substantially flush to the crimping member 720 .
- the assembly is now in dynamic relationship with the core 706 being in tension while the spacer 710 that is slidable with respect to the core 706 is compressed between the plates 746 and 770 and the bumper 718 that is also slidable with respect to the core 706 is compressed between the sleeve 712 and the crimping member 720 ; the spacer 710 and the bumper 718 placing a distractive force on the core 706 along the axis BB and between the buttress plate 746 and the crimping member 720 .
- the assembly 701 may then be implanted, cooperating with a pair of bone screws 525 as illustrated in FIG. 43 and as previously described herein with respect to the assembly 501 . Unlike the assembly 501 illustrated in FIG.
- the bent core 706 and cooperating trapezoidal spacer 710 provide additional support or correction to a spine, for example, when correcting spinal lordosis.
- the assembly 701 and cooperating bone screws 525 of FIG. 43 are shown under a load that causes the core 706 to straighten and further compresses the spacer 710 resulting in a bulging of the flexible spacer at the anterior surface 798 .
- the assembly 801 includes an anchor member 804 having an inner core 806 and a bone anchor attachment portion 808 ; a trapezoidal spacer 810 , a sleeve 812 , a second spacer 814 , a second sleeve 816 , a bumper 818 and a crimping member 820 .
- the illustrated spacer 810 , sleeve 812 , bumper 818 and crimping member 820 are identical or substantially similar to the respective spacer 710 , sleeve 712 , bumper 718 and crimping member 720 previously described herein with respect to the assembly 701 .
- the anchor member 804 is identical to the anchor member 704 with the exception that the bone anchor attachment portion 808 is of a greater length to receive three bone screw receivers 531 therealong while the portion 708 is sized to receive two bone screw receivers 531 .
- the second spacer 814 is substantially similar in shape and function as the spacer 510 previously described herein with respect to the assembly 501 with the exception that the through bore defined by the inner planar surfaces is uniform (see FIG. 46 ) and does not require a flared portion for cooperating with the core 806 as the spacer 814 is disposed along a uniform mid-section of the core 806 .
- the sleeve 816 is for the most part similar to the sleeve 812 , the sleeve 712 and the sleeve 512 of the previously described embodiments, having outer planar surfaces 860 and 862 , a rectangular cross-section, inner planar surfaces 864 and 866 defining a through bore for closely receiving the core 806 and an end plate 870 identical or substantially similar to the respective outer surfaces 560 and 562 , inner surfaces 564 and 566 and end plate 570 of the sleeve 512 previously described herein with respect to the assembly 501 . Additionally, the sleeve 816 has an opposite end plate 871 spaced from and parallel to the end plate 870 .
- the assembly 801 is assembled in a manner substantially similar to the manner of assembly previously described herein with respect to the assembly 701 .
- the core 806 is first received within a through bore of the spacer 810 , then within the inner planar surfaces 864 and 866 of the sleeve 816 , followed by an inner through bore of the spacer 814 and then a through bore of the sleeve 812 . Thereafter, the core 806 is received in an inner through bore of the bumper 818 and then an inner through bore of the crimping member 820 .
- the core 806 is initially of a longer length than is shown in the drawing figures, allowing for a manipulation tool to grasp the core near an end thereof that extends through the crimping member bore.
- the core 806 is tensioned and/or the spacers 810 and 816 and the bumper 818 are compressed, followed by deformation of the crimping member 820 against the core 806 .
- the core 806 is then trimmed substantially flush to the crimping member 820 .
- the assembly is now in dynamic relationship with the core 806 being in tension while the spacers 810 and 816 that are slidable with respect to the core 806 are compressed and the bumper 818 that is also slidable with respect to the core 806 is compressed between the sleeve 812 and the crimping member 820 ; the spacers 810 and 816 and the bumper 818 placing a distractive force on the core 806 along an elongate axis thereof.
- the assembly 801 may then be implanted, cooperating with a three bone screws 525 as illustrated in FIG. 48 and as previously described herein with respect to the assembly 501 . Unlike the assembly 501 illustrated in FIG.
- the bent core 806 and cooperating trapezoidal spacer 810 provide additional support or correction to a spine, for example, when correcting spinal lordosis.
- the assembly 801 and cooperating bone screws 525 of FIG. 48 are shown under a load that causes the core 806 to straighten and further compresses the spacer 810 resulting in a bulging of an anterior surface of the spacer 810 .
- longitudinal connecting member assemblies according to the invention may be of a variety of lengths for cooperation with a plurality of bone screws 525 , either along an attachment portion, such as the portion 808 or along dynamic portions that include one or more spacers and one or more sleeves, such as the sleeves 512 , 712 , 812 and 816 for attachment of a plurality of bone screws 525 or other bone anchors. It is foreseen that such sleeves may also be a variety of lengths for attachment to one or more bone anchors along a length of the individual sleeve.
- FIGS. 50-52 illustrate another embodiment of a dynamic longitudinal connecting member assembly, generally 901 .
- the assembly 901 includes an anchor member 904 having an inner core 906 and a bone anchor attachment portion 908 ; first and second trapezoidal spacers 910 A and 910 B, a sleeve 912 , a second sleeve 916 , a bumper 918 and a crimping member 920 .
- the illustrated trapezoidal spacers 910 A and 910 B are identical or substantially similar to the trapezoidal spacer 710 previously described herein with respect to the assembly 701 .
- the second spacer 910 B would not require an inner flared portion as such spacer is placed along a uniform mid-section of the core 906 .
- the sleeves 912 and 916 are substantially similar to the respective sleeves 812 and 816 previously described herein with respect to the assembly 801 .
- the bumper 918 and crimping member 920 are identical or substantially similar to the respective bumpers 518 , 718 and 818 and crimping members 520 , 720 and 820 previously described herein with respect to the assemblies, 501 , 701 and 801 .
- the anchor member 904 is identical to the anchor member 804 with the exception that the core 906 is bent at two locations corresponding to the operative placement of the trapezoidal spacers 910 A and 910 B.
- the assembly 901 is assembled in a manner substantially similar to the manner of assembly previously described herein with respect to the assembly 801 .
- the core 906 is first received within a through bore of the spacer 910 , then within the inner planar surfaces defining the inner through bore of the sleeve 916 , followed by an inner through bore of the spacer 910 A and then a through bore of the sleeve 912 . Thereafter, the core 906 is received in an inner through bore of the bumper 918 and then an inner through bore of the crimping member 920 .
- the core 906 is initially of a longer length than is shown in the drawing figures, allowing for a manipulation tool to grasp the core 906 near an end thereof that extends through the crimping member bore.
- the core 906 is tensioned and/or the spacers 910 A and 910 B and the bumper 918 are compressed, followed by deformation of the crimping member 920 against the core 906 .
- the core 906 is then trimmed substantially flush to the crimping member 920 .
- the assembly is now in dynamic relationship with the core 906 being in tension while the spacers 910 A and 910 B that are slidable with respect to the core 906 are compressed and the bumper 918 that is also slidable with respect to the core 906 is compressed between the sleeve 912 and the crimping member 920 ; the spacers 910 A and 910 B and the bumper 918 placing a distractive force on the core 946 along an elongate axis thereof.
- the assembly 901 may then be implanted, cooperating with a three bone screws 525 as illustrated in FIG. 51 and as previously described herein with respect to the assembly 501 .
- the bent core 906 and cooperating trapezoidal spacers 910 A and 910 B provide additional support or correction to a spine, for example, when correcting spinal lordosis.
- the assembly 901 and cooperating bone screws 525 of FIG. 51 are shown under a load that causes the core 906 to straighten and further compresses the spacers 910 A and 910 B resulting in a bulging of anterior surfaces of the spacers 910 A and 910 B.
Abstract
A dynamic longitudinal connecting member assembly includes an anchor member having an integral or otherwise fixed elongate core of circular or non-circular cross-section. The core is pre-tensioned and extends through at least one elastic spacer and at least one outer sleeve. The anchor member and the outer sleeve each attach to at least one bone anchor. In operation, the core is held in tension by the spacer.
Description
- This application is a continuation of U.S. application Ser. No. 12/459,492, filed Jul. 1, 2009, which is a continuation-in-part of U.S. application Ser. No. 12/156,260, filed May 30, 2008 that claimed the benefit of U.S. Provisional Application No. 60/932,567 filed May 31, 2007, all of which are incorporated by reference herein. U.S. application Ser. No. 12/156,260 also claimed the benefit of U.S. Provisional Application No. 60/994,068 filed Sep. 17, 2007, which is incorporated by reference herein. U.S. application Ser. No. 12/459,492 also claimed the benefit of U.S. Provisional Patent Application Ser. No. 61/134,480, filed Jul. 10, 2008 and claimed the benefit of U.S. Provisional Patent Application Ser. No. 61/137,743, filed Aug. 1, 2008. U.S. application Ser. No. 12/459,492 was also a continuation-in-part of U.S. patent application Ser. No. 12/148,465, filed Apr. 18, 2008 that claimed the benefit of U.S. Provisional Patent Application Ser. No. 60/927,111, filed May 1, 2007, all of which are incorporation by reference herein.
- The present invention is directed to dynamic fixation assemblies for use in bone surgery, particularly spinal surgery, and in particular to longitudinal connecting members for such assemblies, the connecting members being attached to at least two bone fasteners.
- Historically, it has been common to fuse adjacent vertebrae that are placed in fixed relation by the installation therealong of bone screws or other bone anchors and cooperating longitudinal connecting members or other elongate members. Fusion results in the permanent immobilization of one or more of the intervertebral joints. Because the anchoring of bone screws, hooks and other types of anchors directly to a vertebra can result in significant forces being placed on the vertebra, and such forces may ultimately result in the loosening of the bone screw or other anchor from the vertebra, fusion allows for the growth and development of a bone counterpart to the longitudinal connecting member that can maintain the spine in the desired position even if the implants ultimately fail or are removed. Because fusion has been a desired component of spinal stabilization procedures, longitudinal connecting members have been designed that are of a material, size and shape to largely resist flexure, extension, torsion, distraction and compression, and thus substantially immobilize the portion of the spine that is to be fused. Thus, longitudinal connecting members are typically uniform along an entire length thereof, and usually made from a single or integral piece of material having a uniform diameter or width of a size to provide substantially rigid support in all planes.
- An alternative to fusion, which immobilizes at least a portion of the spine, and the use of more rigid longitudinal connecting members or other rigid structure has been a “soft” or “dynamic” stabilization approach in which a flexible loop-, S-, C- or U-shaped member or a coil-like and/or a spring-like member is utilized as an elastic longitudinal connecting member fixed between a pair of pedicle screws in an attempt to create, as much as possible, a normal loading pattern between the vertebrae in flexion, extension, distraction, compression, side bending and torsion. Another type of soft or dynamic system known in the art includes bone anchors connected by flexible cords or strands, typically made from a plastic material. Such a cord or strand may be threaded through cannulated spacers that are disposed between adjacent bone anchors when such a cord or strand is implanted, tensioned and attached to the bone anchors. The spacers typically span the distance between bone anchors, providing limits on the bending movement of the cord or strand and thus strengthening and supporting the overall system. Such cord or strand-type systems require specialized bone anchors and tooling for tensioning and holding the cord or strand in the bone anchors. Although flexible, the cords or strands utilized in such systems do not allow for elastic distraction of the system once implanted because the cord or strand must be stretched or pulled to maximum tension in order to provide a stable, supportive system.
- The complex dynamic conditions associated with spinal movement create challenges for the design of elongate elastic longitudinal connecting members that exhibit an adequate fatigue strength to provide stabilization and protected motion of the spine, without fusion, and that allow for some natural movement of the portion of the spine being reinforced and supported by the elongate elastic or flexible connecting member. A further challenge are situations in which a portion or length of the spine requires a more rigid stabilization, possibly including fusion, while another portion or length may be better supported by a more dynamic system that allows for protective movement.
- Longitudinal connecting member assemblies according to the invention for use between at least two bone attachment structures or anchors provide dynamic, protected motion of the spine. A longitudinal connecting member assembly according to the invention has an inner pre-tensioned core of circular or non-circular cross-section that is integral or otherwise fixed to a first bone anchor attachment portion. At least one elastic spacer surrounds the core and is slidable along the core at a location between a pair of adjacent bone anchors. At least one outer sleeve also surrounds the core and is in sliding relationship with the core. The outer sleeve also engages at least one bone anchor. The inner core and outer elastic spacer cooperate dynamically, with the outer sleeve being in compression while the core is in tension. The assembly may further include an elastic end bumper that also is in compression and places distractive force on the core.
- In one embodiment, an improved medical implant assembly having at least two bone anchor attachment structures cooperating with a longitudinal connecting member is provided, including an anchor member portion that is in engagement with one of the at least two bone anchor attachment structures, at least one compressible outer spacer, and at least one sleeve. The anchor member portion has a pre-tensioned member portion of reduced diameter that extends from an end thereof. The pre-tensioned member portion is received in the spacer, and the spacer is positioned between the at least two bone anchor attachment structures. The pre-tensioned member portion is also received within the sleeve and in slidable relationship therewith. The sleeve is in engagement with the other of the at least two bone anchor attachment structures. The improvement may further include an elastic bumper that engages the sleeve and receives the pre-tensioned member portion therein. The improvement may further include a fixation structure that is secured to the pre-tensioned member portion at an end thereof opposite the anchor member portion.
- In another embodiment, an improved medical implant assembly having at least two bone attachment structures cooperating with a longitudinal connecting member is provided, the improvement wherein the longitudinal connecting member includes an anchor member portion in engagement with one of the at least two bone attachment structures, the anchor member portion having a pre-tensioned bendable core extension of reduced diameter along a length thereof, the core extension attached to and extending from the anchor member portion and having a linear and a non-linear configuration; at least one compressible outer spacer, the core extension being received in the spacer, the spacer being positioned between the at least two bone attachment structures; and at least one sleeve, the core extension being received within the sleeve and in slidable relationship therewith, the sleeve being in engagement with the other of the at least two bone attachment structures.
- In yet another embodiment, an improved medical implant assembly having at least two bone anchor attachment structures cooperating with a longitudinal connecting member is provided, the improvement wherein the longitudinal connecting member includes an anchor member portion in engagement with one of the at least two bone anchor attachment structures, the anchor member portion having a pre-tensioned member portion of reduced diameter extending from an end thereof; at least one compressible outer spacer, the pre-tensioned member portion being received in the spacer, the spacer being positioned between the at least two bone anchor attachment structures; and at least one sleeve, the pre-tensioned member portion being received within the sleeve and in slidable relationship therewith, the sleeve being in engagement with the other of the at least two bone anchor attachment structures. In some embodiments, the longitudinal connecting member also includes one or more of an elastic bumper and a fixation structure. Further, the pre-tensioned member portion is fixed to the anchor member portion at an end thereof, in some embodiments.
- In still another embodiment, a medical implant assembly having at least two bone attachment structures cooperating with a longitudinal connecting member is provided, the improvement wherein the longitudinal connecting member includes an anchor member portion in engagement with one of the at least two bone attachment structures, the anchor member portion having a pre-tensioned bendable core extension of reduced diameter along a length thereof, the core extension attached to and extending from the anchor member portion and having a linear and a non-linear configuration; at least one compressible outer spacer, the core extension being received in the spacer, the spacer being positioned between the at least two bone attachment structures; and at least one sleeve, the core extension being received within the sleeve and in slidable relationship therewith, the sleeve being in engagement with the other of the at least two bone attachment structures.
- In another embodiment, a medical implant assembly is provided, the assembly including a longitudinal connecting member having a stiff portion secured to at least a first bone attachment structure, the stiff portion being coaxial with a less stiff core extension portion of reduced width relative to the stiff portion, the core extension being in slidable relation with at least a second end bone attachment structure; at least one solid non-slitted outer spacer positioned entirely outside of the core extension and between the at least first and second end bone attachment structures, the spacer being in slidable relation with the core extension; and at least one end fixing structure and at least one elastic bumper, both the end fixing structure and the elastic bumper being positioned entirely outside of the at least second end bone attachment structure, wherein the bumper is positioned around the core extension and between the fixing structure and the at least second end bone attachment structure, and wherein the bumper is in slidable relation with the core extension; and wherein the fixing structure is slidable on the core section, compressible against the bumper and securable to the core extension.
- In a further embodiment, the core extension is in tension. In some further embodiments, the core extension is maintained in tension by axial elastic distraction from the bumper. In some further embodiments, the core extension is made of at least one of a polymer, PEEK and a non-metal. In some further embodiments, at least one sleeve is positioned around and between the core extension and the bone attachment structure, the sleeve being secured to at least the bone attachment structure. In some further embodiments, the tensioned core extension is adapted to provide resilient bending stiffness for the longitudinal connecting member while cooperating with the bone attachment structures. In some further embodiments, the end fixing structure is positioned entirely outside of the bumper. In some further embodiments, the bumper and the spacer are positioned entirely outside of the sleeve.
- An object of the invention is to provide dynamic medical implant stabilization assemblies having longitudinal connecting members that include a pre-tensioned inner core that allows for some bending, torsion, compression and distraction of the assembly. Another object of the invention is to provide such an assembly including an elastic pre-compressed outer spacer or sleeve. A further object of the invention is to provide dynamic medical implant longitudinal connecting members that may be utilized with a variety of bone screws, hooks and other bone anchors. Additionally, it is an object of the invention to provide a lightweight, reduced volume, low profile assembly including at least two bone anchors and a longitudinal connecting member therebetween. Furthermore, it is an object of the invention to provide apparatus and methods that are easy to use and especially adapted for the intended use thereof and wherein the apparatus are comparatively inexpensive to make and suitable for use.
- Other objects and advantages of this invention will become apparent from the following description taken in conjunction with the accompanying drawings wherein are set forth, by way of illustration and example, certain embodiments of this invention.
- The drawings constitute a part of this specification and include exemplary embodiments of the present invention and illustrate various objects and features thereof.
-
FIG. 1 is an enlarged front elevational view of a dynamic fixation connecting member assembly according to the invention including an anchor member integral with an inner core, two elastic spacers, two sleeves, an elastic bumper and a crimping ring. -
FIG. 2 is a cross-sectional view taken along the line 2-2 ofFIG. 1 . -
FIG. 3 is an enlarged perspective view of the anchor member ofFIG. 1 . -
FIG. 4 is an enlarged perspective view of one of the sleeves ofFIG. 1 . -
FIG. 5 is an enlarged perspective view of another of the sleeves ofFIG. 1 . -
FIG. 6 is an enlarged exploded front elevational view of the assembly ofFIG. 1 . -
FIG. 7 is an enlarged perspective view of the crimping ring ofFIG. 1 . -
FIG. 8 is an enlarged perspective view of the elastic bumper ofFIG. 1 . -
FIG. 9 is an enlarged front perspective view of an elastic spacer ofFIG. 1 . -
FIG. 10 is an enlarged rear perspective view of the elastic spacer ofFIG. 9 . -
FIG. 11 is an enlarged front perspective view of another elastic spacer ofFIG. 1 . -
FIG. 12 is an enlarged rear perspective view of the elastic spacer ofFIG. 11 . -
FIG. 13 is a reduced front elevational view of the assembly ofFIG. 1 shown with three cooperating bone screws. -
FIG. 14 is an enlarged front elevational view of a second embodiment of a dynamic fixation connecting member assembly according to the invention including an anchor member integral with an inner core, an elastic spacer, a sleeve, an elastic bumper and a crimping ring. -
FIG. 15 is a reduced exploded front elevational view of the assembly ofFIG. 14 . -
FIG. 16 is a cross-sectional view taken along the line 16-16 ofFIG. 14 . -
FIG. 17 is a reduced front elevational view of the assembly ofFIG. 14 shown with three cooperating bone screws. -
FIG. 18 is front elevational view of a third embodiment of a dynamic fixation connecting member assembly according to the invention shown with four cooperating bone screws. -
FIG. 19 is a front elevational view of a fourth embodiment of a dynamic fixation connecting member assembly according to the invention with portions broken away to show the detail thereof. -
FIG. 20 is a front elevational view of a fifth embodiment of a dynamic fixation connecting member assembly according to the invention with an inner threaded core shown in phantom. -
FIG. 21 is a front elevational view of a sixth embodiment of a dynamic fixation connecting member assembly according to the invention. -
FIG. 22 is a reduced exploded front elevational view of the connecting member ofFIG. 21 . -
FIG. 23 is a reduced cross-sectional view taken along the line 23-23 ofFIG. 21 . -
FIG. 24 is a front elevational view of a seventh embodiment of a dynamic fixation connecting member assembly according to the invention shown with three bone screws. -
FIG. 25 is an enlarged perspective view of an eighth embodiment of a dynamic fixation connecting member assembly according to the invention including an anchor member integral with an inner core, an elastic spacer, a sleeve, an elastic bumper and a crimping member. -
FIG. 26 is a cross-sectional view taken along the line 26-26 ofFIG. 25 . -
FIG. 27 is an enlarged exploded front elevational view of the assembly ofFIG. 25 . -
FIG. 28 is an enlarged perspective view of the anchor member ofFIG. 25 . -
FIG. 29 is an enlarged side elevational view of the anchor member ofFIG. 25 . -
FIG. 30 is an enlarged perspective view of the spacer ofFIG. 25 . -
FIG. 31 is an enlarged side elevational view of the spacer ofFIG. 25 . -
FIG. 32 is an enlarged perspective view of the sleeve ofFIG. 25 . -
FIG. 33 is an enlarged side elevational view of the sleeve ofFIG. 25 . -
FIG. 34 is an enlarged perspective view of the elastic bumper ofFIG. 25 . -
FIG. 35 is an enlarged side elevational view of the elastic bumper ofFIG. 25 . -
FIG. 36 is an enlarged perspective view of the crimping member ofFIG. 25 . -
FIG. 37 is an enlarged side elevational view of the crimping member ofFIG. 25 . -
FIG. 38 is an enlarged front elevational view of the assembly ofFIG. 25 shown with two cooperating bone screws with portions broken away to show the detail thereof. -
FIG. 39 is an enlarged perspective view of a ninth embodiment of a dynamic fixation connecting member assembly according to the invention including an anchor member integral with an inner core, an elastic spacer with a trapezoidal face, a sleeve, an elastic bumper and a crimping member. -
FIG. 40 is a reduced exploded perspective view of the assembly ofFIG. 39 . -
FIG. 41 is an enlarged front elevational view of the elastic spacer ofFIG. 39 . -
FIG. 42 is an enlarged side elevational view of the elastic spacer ofFIG. 39 . -
FIG. 43 is an enlarged and partial front elevational view of the assembly ofFIG. 39 shown cooperating with a pair of bone screws. -
FIG. 44 is an enlarged and partial front elevational view similar toFIG. 43 showing the assembly in a loaded condition. -
FIG. 45 is an enlarged front elevational view of a tenth embodiment of a dynamic fixation connecting member assembly according to the invention including an anchor member integral with an inner core, a first elastic spacer with a trapezoidal face, a first sleeve, a second elastic spacer, a second sleeve, an elastic bumper and a crimping member. -
FIG. 46 is an enlarged front elevational view similar toFIG. 45 with portions broken away to show the detail thereof. -
FIG. 47 is an enlarged perspective view of the first sleeve ofFIG. 45 . -
FIG. 48 is an enlarged and partial perspective view of the assembly ofFIG. 45 shown cooperating with three bone screws and with portions broken away to show the detail thereof. -
FIG. 49 is an enlarged and partial perspective view similar toFIG. 48 showing the assembly ofFIG. 45 under a load. -
FIG. 50 is an enlarged perspective view of an eleventh embodiment of a dynamic fixation connecting member assembly according to the invention including an anchor member integral with an inner core, a first elastic spacer with a trapezoidal face, a first sleeve, a second elastic spacer with a trapezoidal face, a second sleeve, an elastic bumper and a crimping member. -
FIG. 51 is a reduced and partial front elevational view of the assembly ofFIG. 50 shown cooperating with three bone screws. -
FIG. 52 is a partial front elevational view similar toFIG. 51 showing the assembly ofFIG. 50 under a load. - As required, detailed embodiments of the present invention are disclosed herein; however, it is to be understood that the disclosed embodiments are merely exemplary of the invention, which may be embodied in various forms. Therefore, specific structural and functional details disclosed herein are not to be interpreted as limiting, but merely as a basis for the claims and as a representative basis for teaching one skilled in the art to variously employ the present invention in virtually any appropriately detailed structure. It is also noted that any reference to the words top, bottom, up and down, and the like, in this application refers to the alignment shown in the various drawings, as well as the normal connotations applied to such devices, and is not intended to restrict positioning of the connecting member assemblies of the application and cooperating bone anchors in actual use.
- With reference to
FIGS. 1-13 , thereference numeral 1 generally designates a non-fusion dynamic stabilization longitudinal connecting member assembly according to the present invention. The connectingmember assembly 1 includes an anchor member, generally 4, having an elongate segment or inner core 6 and a boneanchor attachment portion 8; a firstelastic spacer 10; afirst sleeve 12; a secondelastic spacer 14; asecond sleeve 16; anelastic bumper 18; and a crimpingring 20; all substantially symmetrically aligned with respect to a central axis A of the anchor member 4. The elongate core 6 of the anchor member 4 is receivable within thespacer 10, thefirst sleeve 12, thesecond spacer 14, thesecond sleeve 16, thebumper 18 and the crimpingring 20. Thus, the axis A of the anchor member 4 is also the axis of the fully assembledassembly 1. As will be described in greater detail below, when fully assembled and fixed with all components fixed in position as shown inFIG. 1 , the inner core 6 is in tension and thespacers bumper 18 are in compression. - As illustrated in
FIG. 13 , the dynamic connectingmember assembly 1 cooperates with at least three bone anchors, such as the polyaxial bone screws, generally 25 and cooperatingclosure structures 27, theassembly 1 being captured and fixed in place at theanchor portion 8, thesleeve 12 and thesleeve 16 by cooperation between the bone screws 25 and theclosure structures 27. Because theanchor portion 8 and thesleeves member assembly 1 may be used with a wide variety of bone screws and other bone anchors already available for cooperation with more rigid rods including fixed, monoaxial bone screws, hinged bone screws, polyaxial bone screws, and bone hooks and the like, with or without compression inserts, that may in turn cooperate with a variety of closure structures having threads, flanges, or other structure for fixing the closure structure to the bone anchor, and may include other features, for example, external or internal drives, break-off tops and inner set screws. The bone anchors, closure structures and the connectingmember assembly 1 are then operably incorporated in an overall spinal implant system for correcting degenerative conditions, deformities, injuries, or defects to the spinal column of a patient. - The illustrated polyaxial bone screws 25 each include a
shank 30 for insertion into a vertebra (not shown), theshank 30 being pivotally attached to an open receiver orhead 31. Theshank 30 includes a threaded outer surface and may further include a central cannula or through-bore disposed along an axis of rotation of the shank. The through bore provides a passage through the shank interior for a length of wire or pin inserted into the vertebra prior to the insertion of theshank 30, the wire or pin providing a guide for insertion of theshank 30 into the vertebra. Thereceiver 31 includes a pair of spaced and generally parallel arms that form an open generally U-shaped channel therebetween that is open at distal ends of such arms. The receiver arms each include radially inward or interior surfaces that have a discontinuous guide and advancement structure mateable with cooperating structure on theclosure structure 27. The guide and advancement structure may be a partial helically wound flangeform configured to mate under rotation with a similar structure on theclosure structure 27 or a buttress thread, a square thread, a reverse angle thread or other thread like or non-thread like helically wound advancement structures for operably guiding under rotation and advancing theclosure structure 27 downward between the receiver arms and having such a nature as to resist splaying of the receiver arms when theclosure 27 is advanced between the receiver arms. - The
shank 30 and thereceiver 31 may be attached in a variety of ways. For example, a spline capture connection as described in U.S. Patent No. 6,716,214, and incorporated by reference herein, may be used wherein the bone screw shank includes a capture structure mateable with a retaining structure disposed within the receiver. The retaining structure includes a partially spherical surface that is slidingly mateable with a cooperating inner surface of thereceiver 31, allowing for a wide range of pivotal movement between theshank 30 and thereceiver 31. Polyaxial bone screws with other types of capture connections may also be used according to the invention, including but not limited to, threaded connections, frictional connections utilizing frusto-conical or polyhedral capture structures, integral top or downloadable shanks, and the like. Also, as indicated above, polyaxial and other bone screws for use with connecting members of the invention may have bone screw shanks that attach directly to the connecting member or may include compression members or inserts that engage the bone screw shank and cooperate with the shank, the receiver and the closure structure to secure the connecting member assembly to the bone screw and/or fix the bone screw shank at a desired angle with respect to the bone screw receiver that holds the longitudinal connecting member assembly. Furthermore, although theclosure structure 27 of the present invention is illustrated with thepolyaxial bone screw 25 having an open receiver orhead 31, it foreseen that a variety of closure structure may be used in conjunction with any type of medical implant having an open or closed head or receiver, including monoaxial bone screws, hinged bone screws, hooks and the like used in spinal surgery. - To provide a biologically active interface with the bone, the threaded
shank 30 may be coated, perforated, made porous or otherwise treated. The treatment may include, but is not limited to a plasma spray coating or other type of coating of a metal or, for example, a calcium phosphate; or a roughening, perforation or indentation in the shank surface, such as by sputtering, sand blasting or acid etching, that allows for bony ingrowth or ongrowth. Certain metal coatings act as a scaffold for bone ingrowth. Bio-ceramic calcium phosphate coatings include, but are not limited to: alpha-tri-calcium phosphate and beta-tri-calcium phosphate (Ca3(PO4)2, tetra-calcium phosphate (Ca4P2O9), amorphous calcium phosphate and hydroxyapatite (Ca10(PO4)6(OH)2). Coating with hydroxyapatite, for example, is desirable as hydroxyapatite is chemically similar to bone with respect to mineral content and has been identified as being bioactive and thus not only supportive of bone ingrowth, but actively taking part in bone bonding. - With reference to
FIG. 13 , theclosure structure 27 can be any of a variety of different types of closure structures for use in conjunction with the present invention with suitable mating structure on the interior surface of the upstanding arms of thereceiver 31. The illustratedclosure structure 27 is rotatable between the spaced arms, but could be a slide-in closure structure. The illustratedclosure structure 27 is substantially cylindrical and includes an outer helically wound guide and advancement structure in the form of a flange form that may take a variety of forms, including those described in Applicant's U.S. Pat. No. 6,726,689, which is incorporated herein by reference. It is also foreseen that according to the invention the closure structure guide and advancement structure could alternatively be a buttress thread, a square thread, a reverse angle thread or other thread like or non-thread like helically wound advancement structure for operably guiding under rotation and advancing theclosure structure 27 downward between the receiver arms and having such a nature as to resist splaying of the arms when theclosure structure 27 is advanced into the U-shaped channel formed by the arms. The illustratedclosure 27 further includes an inner set screw with an internal drive in the form of an aperture utilized for assembly of the set screw and removal of theentire closure 27. It is foreseen that theclosure structure 27 may alternatively include an external drive, such as a break-off head designed to allow such a head to break from a base of the closure at a preselected torque, for example, 70 to 140 inch pounds. Such a closure structure would also include a base having an internal drive to be used for closure removal. - Returning to the longitudinal connecting
member assembly 1 illustrated inFIGS. 1-13 , theassembly 1 is elongate, with the inner core 6 being a substantially solid, smooth and uniform cylinder or rod having an outercylindrical surface 36 and a substantially circular cross-section. The core 6 and integralanchor attachment portion 8 may be made from metal, metal alloys or other suitable materials, including plastic polymers such as polyetheretherketone (PEEK), ultra-high-molecular weight-polyethylene (UHMWP), polyurethanes and composites, including composites containing carbon fiber. It is noted that although an anchor member 4 is illustrated in which thecomponents 6 and 8 are integral, the core 6 and theanchor attachment portion 8 may be made from different materials, for example, the core 6 may be made out of PEEK and fixed or adhered to a boneanchor attachment portion 8 made out of titanium. The core 6 andattachment portion 8 may include a small central lumen or through-bore (not shown) extending along the central axis A. Such a lumen may be used as a passage through theentire assembly 1 interior for a length of a guide wire for aiding insertion of theassembly 1 between implanted bone screws 25 in a percutaneous or less invasive procedure. - With particular reference to
FIG. 3 , the anchor member 4 is substantially cylindrical along an entire length thereof along the axis A and includes at least two or more circular cross-sections along the length thereof. The illustrated member 4 includes the slender and thus more flexible core 6 of a first circular cross-section and the boneanchor attachment portion 8 that has a second circular cross-section that is larger than the core 6 cross-section and thus is more rigid than the core 6. The core 6 terminates at anend 38. Prior to final assembly, the core 6 is typically of a length greater than that shown in the drawing figures so that the core 6 may be grasped by a tool (not shown) near theend 38 and pulled along the axis A in a direction away from theanchor attachment portion 8 in order to place tension on the core 6 as will be described in greater detail below. - With particular reference to
FIGS. 2-3 , between the core 6 and theportion 8 is a buttressplate 40 that has a third circular cross-section that is larger than theattachment portion 8 cross-section. The buttressplate 40 is integral with and disposed between the core 6 and theportion 8. Although the illustrated anchor member 4 is substantially cylindrical, it is foreseen that the core 6, theportion 8 and theplate 40 may have other forms, including but not limited to oval, square and rectangular cross-sections as well as other curved or polygonal shapes. The boneanchor attachment portion 8 is of a length along the axis A for cooperating with at least one and up to a plurality of bone attachment members, such as the bone screws 25, hooks or other types of bone anchors. Theportion 8 is substantially solid and rigid, with an outercylindrical surface 39 that terminates at anend 41. Theplate 40 includes a first substantially flat andannular face 42 facing away from the core 6 and an opposed parallel substantiallyflat face 44 facing toward the core 6. The faces 42 and 44 are disposed substantially perpendicular to the axis A. An outercylindrical surface 46 extends between thefaces flange 48 bridges between and connects the outercylindrical surface 36 of the core 6 with the substantiallyflat face 44 of the buttressplate 40. - With particular reference to
FIGS. 4 and 5 , thesleeves bone screw 25 thereon. Similar to the anchor member 4, thesleeves sleeves sleeves sleeves sleeve - The illustrated
sleeves outer surface 39 of the boneanchor attachment portion 8. Each of thesleeves cylindrical surface sleeve 12 includes a pair of integral,opposed end plates sleeve 16 includes asingle end plate 62. The illustratedplates cylindrical surfaces cylindrical surface 46. Theplates annular surfaces plate 62 terminates at an outer planar andannular surface 74. Thecylindrical surface 52 of thesleeve 16 terminates at an outer planar andannular surface 76. - With reference to
FIGS. 8-12 , theelastic spacers elastic bumper 18 are sized and shaped to be slidingly received over the core 6 and may be made from a variety of elastic materials, including, but not limited to natural or synthetic elastomers such as polyisoprene (natural rubber), and synthetic polymers, copolymers, and thermoplastic elastomers, for example, polyurethane elastomers such as polycarbonate-urethane elastomers. In order to have low or no wear debris, thespacers bumper 18 inner and side surfaces may also be coated with an ultra thin, ultra hard, ultra slick and ultra smooth coating, such as may be obtained from ion bonding techniques and/or other gas or chemical treatments. - The illustrated
spacers FIGS. 9-12 , the illustratedspacers spacers outer surface internal surfaces internal surface 82 is further defined by a flared or conical outwardly extendingsurface 86 sized and shaped for cooperating with thesurface 48 of the anchor member 4. Thespacer 10 includes opposed substantially planar and annular end surfaces 88 and 89 and thespacer 14 includes opposed substantially planar and annular end surfaces 90 and 91. When cooperating with the core 6, the end surfaces 88 and 89 and 90 and 91 are substantially perpendicular to the axis A. It is foreseen that in some embodiments, thespacers spacers compression groove spacers plates grooves external surfaces internal surfaces internal surfaces respective spacers core surface 36. - The core 6 and cooperating
compressible spacers spacers plates plates plates spacers plates - With particular reference to
FIG. 8 , thebumper 18 is substantially cylindrical, including anouter surface 98 and aninner surface 99 forming a substantially cylindrical through bore that opens at planar end surfaces 100 and 101 and operatively extends along the axis A. Thebumper 18 further includes acompression groove 104 that is similar in form and function to thecompression grooves spacers bumper 18 is sized and shaped to slidingly receive the core 6 through theinner surface 99. Thebumper 18 is preferably made from an elastomeric material such as polyurethane. Thebumper 18 operatively provides axial tension on the core 6 as will be described in greater detail below. - With particular reference to
FIG. 7 , the crimpingring 20 is substantially cylindrical and includes anouter surface 110 and aninner surface 112 forming a substantially cylindrical through bore that opens at planar end surfaces 114 and 116 and operatively extends along the axis A. The crimpingring 20 is sized and shaped to receive the elongate core 6 through theinner surface 112. The crimpingring 20 further includes a pair of crimp orcompression grooves 120 that are pressable and deformable inwardly toward the axis A upon final tensioning of the core 6 and compression of thespacers bumper 18 during assembly of theassembly 1. The crimpingring 20 is preferably made from a stiff, but deformable material, including metals and metal alloys. - The illustrated dynamic connecting
member assembly 1 having a pre-tensioned core 6 cooperates with at least three bone anchors, such as polyaxial bone screws, generally 25 as shown inFIG. 13 . In use, the threebone screws 25 are implanted into vertebrae (not shown). Each vertebra may be pre-drilled to minimize stressing the bone. Furthermore, when a cannulated bone screw shank is utilized, each vertebra will have a guide wire or pin inserted therein that is shaped for the bone screw cannula of thebone screw shank 30 and provides a guide for the placement and angle of theshank 30 with respect to the cooperating vertebra. A further tap hole may be made and theshank 30 is then driven into the vertebra by rotation of a driving tool (not shown) that engages a driving feature on or near a top portion of theshank 30. It is foreseen that both thescrews 25 and the longitudinal connectingmember assembly 1 may be inserted in a conventional, percutaneous or other minimally invasive surgical manner. - With particular reference to
FIGS. 1 , 2 and 6, the longitudinal connectingmember assembly 1 is assembled to provide a pre-tensioned core 6 andpre-compressed spacers bumper 18 prior to implanting theassembly 1 in a patient. This is accomplished by first providing the anchor member 4 that has a core 6 that is longer in the axial direction A than the core 6 illustrated in the drawing figures. Thespacer 10 is first loaded onto the core 6 by inserting the core 6end 38 into the bore defined by theinner surface 82 with theface 89 directed toward the buttressplate 40. Thespacer 10 is moved along the core 6 until thesurface 86 contacts thesurface 48. Thesleeve 12 is then threaded onto the core 6 with theface 72 of theplate 60 facing theend surface 88 of thespacer 10. The core 6 is received in the bore defined by the innercylindrical surface 54 and thesleeve 12 is moved along the core 6 until theplate surface 72 abuts thespacer surface 88. Thespacer 14 is thereafter loaded onto the core 6 by inserting the core 6end 38 into the bore defined by theinner surface 84 with theface 91 facing the toward theend plate 58 of thesleeve 12. Thespacer 14 is moved along the core 6 until thesurface 91 contacts thesurface 70. Thesleeve 16 is then threaded onto the core 6 with theface 74 of theplate 62 facing theend surface 90 of thespacer 14. The core 6 is received in the bore defined by the innercylindrical surface 56 and thesleeve 16 is moved along the core 6 until theplate surface 74 abuts thespacer surface 90. Thebumper 18 is thereafter loaded onto the core 6 by inserting the core 6end 38 into the bore defined by theinner surface 99 with theface 101 facing the toward thesurface 76 of thesleeve 16. Thebumper 18 is moved along the core 6 until thesurface 101 contacts thesurface 76. The crimpingring 20 is thereafter loaded onto the core 6 by inserting the core 6end 38 into the bore defined by theinner surface 112 with theface 116 facing the toward thesurface 100 of thebumper 18. The crimpingring 20 is moved along the core 6 until thesurface 116 contacts thesurface 100. It is noted that due to the symmetrical nature of thesleeve 12, thespacer 14, thebumper 18 and the crimpingring 20, these components may be loaded onto the core 6 from either side thereof. - After the crimping
ring 20 is loaded onto the core 6, manipulation tools (not shown) are used to grasp the core 6 near theend 38 and at the boneanchor attachment portion 8, placing tension on the core 6. Furthermore, thespacer 10, thesleeve 12, thespacer 14, thesleeve 16, thebumper 18 and the crimpingring 20 are moved toward the buttressplate 40 and into contact with one another. Axial compressive force may also be placed on the components loaded on the core 6, followed by deforming the crimping ring at thecrimp grooves 120 and against the core 6. When the manipulation tools are released, the crimpingring 20, now firmly and fixedly attached to the core 6 holds thespacers bumper 18 in compression and the spacers and bumper place axial tension forces on the core 6, resulting in a dynamic relationship between the core 6 and thespacers bumper 18. The tension on the core 6 is advantageously balanced and uniform as thespacers sleeves bumper 18 that is compressed between thesleeve surface 76 and the crimpingring surface 116 is also slidable with respect to thecore 206. Thespacers bumper 18 place a distractive force on the core 6 along the axis A and between the buttressplate 40 and the crimpingring 20, but also are movable with respect to the core 6, thus being able to respond to jolting and other body movements and thereafter spring back into an originally set location. Thesleeves spacers spacers spacers end surface 114 of the crimpingring 20. - With reference to
FIG. 13 , the pre-loaded connectingmember assembly 1 is eventually positioned in an open, percutaneous or other less invasive manner in cooperation with the at least threebone screws 25 with thespacers portion 8 andsleeves bone screw receiver 31. Once a desired position is attained, aclosure structure 27 is then inserted into and advanced between the arms of each of thebone screw receivers 31 until appropriately tightened. - The
assembly 1 is thus substantially dynamically loaded and oriented relative to the cooperating vertebra, providing relief (e.g., shock absorption) and protected movement with respect to flexion, extension, distraction and compressive forces placed on theassembly 1 and the three connected bone screws 25. The slender core 6 allows for some twisting or turning, providing some relief for torsional stresses. Furthermore, thecompressed spacers spacers assembly 1 located between the twobone screws 25, e.g., shock absorption. - If removal of the
assembly 1 from any of thebone screw assemblies 25 is necessary, or if it is desired to release theassembly 1 at a particular location, disassembly is accomplished by using the driving tool (not shown) with a driving formation cooperating with theclosure structure 27 internal drive or cooperating set screw internal drive to rotate and remove theclosure structure 27 from thereceiver 31. Disassembly is then accomplished in reverse order to the procedure described previously herein for assembly. - Eventually, if the spine requires more rigid support, the connecting
member assembly 1 according to the invention may be removed and replaced with another longitudinal connecting member, such as a solid rod, having the same diameter as theportion 8 and thesleeves same receivers 31 and the same orsimilar closure structures 27. Alternatively, if less support is eventually required, a less rigid, more flexible assembly, for example, anassembly 1 having components made of a more flexible material, but with the same diameter sleeves as theassembly 1, may replace theassembly 1, also utilizing the same bone screws 25. - With reference to
FIGS. 14-17 , an alternative embodiment of a dynamic longitudinal connecting member, generally 201, includes an anchor member, generally 204, having an elongate segment orinner core 206 and a boneanchor attachment portion 208; anelastic spacer 210; asleeve 216; anelastic bumper 218; and a crimpingring 220; all substantially symmetrically aligned with respect to a central axis B of theanchor member 204. Theelongate core 206 of theanchor member 204 is receivable within thespacer 210, thesleeve 216, thebumper 218 and the crimpingring 220. Thus, the axis B of theanchor member 204 is also the axis of the fully assembledassembly 201. When fully assembled and fixed with all components fixed in position as shown inFIG. 14 , theinner core 206 is in tension and thespacer 210 and thebumper 218 are in compression. - In the illustrated embodiment, the
anchor member 204 is substantially similar to the anchor member 4 previously described herein with respect to theassembly 1. Therefore, themember 204 includes thecore 206, the boneanchor attachment portion 208 and an integral buttressplate 240 identical or substantially similar in size and shape to the respective core 6,attachment portion 8 and buttressplate 40 of the anchor member 4 previously described herein. Themember 204 differs from the member 4 only in the length of the boneanchor attachment portion 208. Theportion 208 is longer than thesimilar portion 8 of the member 4 such that at least twobone screws 25 are attachable to theportion 208 as illustrated inFIG. 17 while only onebone screw 25 is attached to theportion 8 of theassembly 1. Thespacer 210 is identical or substantially similar to thespacer 10 illustrated inFIGS. 11 and 12 and previously described herein. Thesleeve 216 is identical or substantially similar to thesleeve 16 illustrated inFIG. 4 and previously described herein, having an outercylindrical surface 252, an innercylindrical surface 256 defining a through bore and anend plate 262 identical or substantially similar to the respective outercylindrical surface 52, innercylindrical surface 56 andend plate 62 of thesleeve 16 previously described herein. Thebumper 218 and the crimpingring 220 are identical or substantially similar to therespective bumper 18 and the crimpingring 20 previously described herein with respect to theassembly 1. - The
assembly 201 is assembled in a manner substantially similar to the manner of assembly previously described herein with respect to theassembly 1, theassembly 201 however, does not include a second spacer or second sleeve. Therefore, thecore 206 is first received within a through bore of thespacer 210, then within the innercylindrical surface 256 of thesleeve 216, followed by an inner through bore of thebumper 218 and then an inner through bore of the crimpingring 220. Similar to what has been described previously with respect to theassembly 1, thecore 206 is initially of a longer length measured along the axis B than is shown in the drawing figures, allowing for a manipulation tool to grasp thecore 206 near an end thereof that extends through the crimping ring bore. Thecore 206 is tensioned and/or thespacer 210 andbumper 220 are compressed, followed by deformation of the crimpingring 220 against thecore 206. Thecore 206 is then trimmed substantially flush to the crimpingring 220. The assembly is now in dynamic relationship with thecore 206 being in tension while thespacer 210 that is slidable with respect to thecore 206 is compressed between theplates bumper 218 that is also slidable with respect to thecore 206 is compressed between thesleeve 216 and the crimpingring 220; thespacer 210 and thebumper 218 placing a distractive force on thecore 206 along the axis B and between the buttressplate 240 and the crimpingring 220. Theassembly 201 may then be implanted, cooperating with threebone screws 25 as illustrated inFIG. 17 and as previously described herein with respect to theassembly 1. Unlike theassembly 1 illustrated inFIG. 13 that provides for a more dynamic and flexible connection between all three illustrated bone screws 25, theassembly 201 provides for dynamic stabilization between first and second bone screws 25 and a more rigid connection between thesecond bone screw 25 and athird bone screw 25 as both the second and third bone screws are attached to therigid attachment portion 208. - With reference to
FIG. 18 , a third embodiment of a dynamic longitudinal connecting member assembly, generally 301 is illustrated. The assembly 301 includes an anchor member 304 having aninner core 306 and a boneanchor attachment portion 308; aspacer 310, a sleeve 316, abumper 318 and a crimping ring 320. The illustratedspacer 310, sleeve 316,bumper 318 and crimping ring 320 are identical to thespacer 210,sleeve 216,bumper 218 and crimpingring 220 previously described herein with respect to theassembly 201. The anchor member 304 is identical to theanchor member 204 with the exception that the boneanchor attachment portion 308 is of a length to receive threebone screw receivers 31 therealong while theportion 208 is sized to receive twobone screw receivers 31. It is foreseen that longitudinal connecting member assemblies according to the invention may be of a variety of lengths for cooperation with a plurality of bone screws 25, either along a rigid end portion, such as theportion 308 shown inFIG. 18 , or along dynamic portions that include one or more spacers and one or more sleeves, such as thesleeves - With reference to
FIGS. 19 and 20 , fourth and fifth embodiments of a dynamic longitudinal connecting member assembly of the invention are illustrated. With reference toFIG. 19 , anassembly 1′ is illustrated that is substantially similar to theassembly 1 previously described herein with an anchor member, generally 4′, having an inner core extension 6′ fixed to a boneanchor attachment portion 8′;spacers 10′ and 14′;sleeves 12′ and 16′; abumper 18′ and a crimpingring 20′, all aligned along an axis A′. The illustratedspacers 10′ and 14′,sleeves 12′ and 16′,bumper 18′ and crimpingring 20′ are identical or substantially similar to therespective spacers sleeves bumper 18 and crimpingring 20 of theassembly 1. Theembodiment 1′ differs from theassembly 1 only in how the core extension 6′ is fixed to the boneanchor attachment portion 8′. In theassembly 1′ theattachment portion 8′ includes a threaded aperture T and the core extension 6′ includes an outer threadedportion 36′ that mates with the threaded aperture T, fixing the core extension 6′ to theportion 8′ upon rotation of the core extension 6′ about the axis A′ within the aperture T. - With reference to
FIG. 20 , another embodiment of the invention, anassembly 201′, is shown that is substantially similar to theassembly 201 illustrated inFIGS. 14-17 . Theassembly 201′ includes an anchor member, generally 204′, having aninner core extension 206′ fixed to a boneanchor attachment portion 208′; aspacer 210′; asleeve 216′; abumper 218′ and a crimpingring 220′, all aligned along an axis B′. The illustratedspacer 210′,sleeve 216′,bumper 218′ and crimpingring 220′ are identical or substantially similar to therespective spacer 210,sleeve 216,bumper 218 and crimpingring 220 of theassembly 201. Theembodiment 201′ differs from theassembly 201 only in how thecore extension 206′ is fixed to the boneanchor attachment portion 208′. In theassembly 201′ theattachment portion 208′ includes a threaded aperture T′ and thecore extension 206′ includes an outer threadedportion 236′ that mates with the threaded aperture T′, fixing thecore extension 206′ to theportion 208′ upon rotation of thecore extension 206′ about the axis B′ within the aperture T′. It is noted that the aperture T shown inFIG. 19 extends completely through theportion 8′ while the aperture T′ shown inFIG. 20 extends substantially into theportion 208′ along the axis B′, but does not extend therethrough. - With reference to
FIGS. 21-23 , another embodiment of a connecting member according to the invention, anassembly 401 is shown that includes the same or similar components to theassemblies assembly 401 has a constant outer diameter along an entire length thereof. Thus, theassembly 401 generally designates a non-fusion dynamic stabilization longitudinal connecting member assembly according to the present invention having an anchor member, generally 404, that includes an elongate segment orinner core 406 integral with or otherwise fixed to a boneanchor attachment portion 408; an end spacer or stop 410; a secondelastic spacer 411; arigid sleeve 412; and a crimpingring 420; all substantially symmetrically aligned with respect to a central axis of theanchor member 404. Theelongate core 406 of theanchor member 404 is receivable within thespacers sleeve 412 and the crimpingring 420. Thus, the central axis of theanchor member 404 is also the axis of the fully assembledassembly 401. Although not shown, thecore 406 may be made of a slightly longer length and an elastic bumper, similar to thebumper 18 of the assembly 1 (but of a different inner diameter, such as thebumper 418′ shown inFIG. 24 ) may be placed between thesleeve 412 and the crimpingring 420. Thecore 406,anchor attachment portion 408,spacers sleeve 412 and crimpingring 420 are substantially similar in form and function to the respective core 6,anchor attachment portion 8,spacer 10,sleeve 12 and crimpingring 20 of theassembly 1. In the illustratedembodiment 401, the twospacers spacer 410 of a more rigid material than thespacer 411 to provide more of a stop or barrier between theanchor attachment portion 408 and thespacer 411 in light of the reduced size of the components of theassembly 401 as compared to theassembly 1 and the fact that theassembly 401 does not include a buttress plate such as the buttressplate 40 of theassembly 1. It is foreseen that in certain embodiments of the invention, the twospacers portion 408 to thecore 406 shown in the drawings, theanchor attachment portion 408 and thecore 406 may be configured in a more abrupt or stepped manner, forming a small stop or abutment surface disposed perpendicular to the central axis of theanchor member 404. - Similar to the
assembly 1, theassembly 404, when fully assembled, has theinner core 406 in tension and at least thespacer 411 in compression, with thering 420 crimped against thecore 406. The dynamic connectingmember assembly 401 cooperates with at least two bone anchors (not shown), such as theanchors 25, the anchors being attached to theportion 408 and therigid sleeve 412. - With reference to
FIG. 24 , another embodiment of a connecting member according to the invention, anassembly 401′, is shown that is substantially similar to theassembly 401. Theassembly 401′ differs from theassembly 401 only that theassembly 401′ includes abumper 418′, a pair ofspacers 411′ identical or substantially similar to thespacer 411 and a pair ofrigid sleeves 412′ identical or substantially similar to thesleeve 412, allowing for abone screw 25 to be attached to eachsleeve 412′ as well as to theanchor portion 408′, for a total of at least three bone screws 25. Onespacer 411′ is disposed between eachbone screw 25. Thus, theassembly 401′ includes ananchor member 404′ that includes an elongate segment or inner core (not shown, but substantially similar to thecore 406 shown inFIG. 22 ) and an integral boneanchor attachment portion 408′; an end spacer or stop 410′; a pair ofelastic spacers 411′; a pair ofrigid sleeves 412′; and a crimpingring 420′; all substantially symmetrically aligned with respect to a central axis of theanchor member 404′. The elongate core of theanchor member 404′ is receivable within theend spacer 410′, thespacers 411′, thesleeves 412′ and the crimpingring 420′ as well as theelastic bumper 418′ that is similar in form and function to thebumper 18 of theassembly 1. Thus, theanchor member 404′,spacers 411,sleeve 412,bumper 418′ and crimpingring 420 are substantially similar in form and function to the respective anchor member 4,spacer 10,sleeve 12,bumper 18 and crimpingring 20 of theassembly 1. Similar to theassembly 401, theassembly 401′ end spacer or stop 410′ may be elastic like thespacers 411′ or may be made of a more rigid material in order to function in a manner similar to the buttressplate 40 of theassembly 1. - With reference to
FIGS. 25-38 , thereference numeral 501 generally designates another embodiment of a non-fusion dynamic stabilization longitudinal connecting member assembly according to the present invention. The connectingmember assembly 501 includes an anchor member, generally 504, having an elongate segment or inner core orcore extension 506 and a boneanchor attachment portion 508; anelastic spacer 510; asleeve 512; anelastic bumper 518; and a crimpingmember 520; all substantially symmetrically aligned with respect to a central axis AA of theanchor member 504. Theelongate core 506 of theanchor member 504 is receivable within thespacer 510, thesleeve 512, thebumper 518 and the crimpingmember 520. Thus, the axis AA of theanchor member 504 is also a central axis of the fully assembledassembly 501. As will be described in greater detail below, when fully assembled and fixed with all components fixed in position as shown inFIG. 25 , theinner core 506 is in tension and thespacer 510 and thebumper 518 are in compression. - As illustrated in
FIG. 38 , the dynamic connectingmember assembly 501 cooperates with at least two bone anchors, such as the polyaxial bone screws, generally 525 and cooperatingclosure structures 527, theassembly 501 being captured and fixed in place at theanchor portion 508 and thesleeve 512 by cooperation between the bone screws 525 and theclosure structures 527. All of the embodiments according to the invention illustrated inFIGS. 25-52 are shown with the same bone screws 525 and cooperatingclosure structures 527, however, as more fully discussed below, a wide variety of bone anchors may be used with connecting members according to the invention. For example, because theanchor portion 508 and thesleeve 512 of theassembly 501 have substantially solid and planar surfaces, the connectingmember assembly 501 may be used with a wide variety of bone screws and other bone anchors that closely receive the planar surfaces of theassembly 501, including fixed, monoaxial bone screws, hinged bone screws, polyaxial bone screws, and bone hooks and the like, with or without compression inserts, that may in turn cooperate with a variety of closure structures having threads, flanges, or other structure for fixing the closure structure to the bone anchor, and may include other features, for example, external or internal drives, break-off tops and inner set screws. The bone anchors, closure structures and the connectingmember assembly 501 are then operably incorporated in an overall spinal implant system for correcting degenerative conditions, deformities, injuries, or defects to the spinal column of a patient. - The illustrated polyaxial bone screws 525 each include a
shank 530 for insertion into a vertebra (not shown), theshank 530 being pivotally attached to an open receiver orhead 531. Theshank 530 includes a threaded outer surface and may further include a central cannula or through-bore disposed along an axis of rotation of the shank. The through bore provides a passage through the shank interior for a length of wire or pin inserted into the vertebra prior to the insertion of theshank 530, the wire or pin providing a guide for insertion of theshank 530 into the vertebra. Thereceiver 531 includes a pair of spaced and generally parallel arms that form an open squared off U-shaped channel therebetween that is open at distal ends of such arms. The receiver arms each include radially inward or interior surfaces that have a discontinuous guide and advancement structure mateable with cooperating structure on theclosure structure 527. The guide and advancement structure may be a partial helically wound flangeform configured to mate under rotation with a similar structure on theclosure structure 527 or a buttress thread, a square thread, a reverse angle thread or other thread like or non-thread like helically wound advancement structures for operably guiding under rotation and advancing theclosure structure 527 downward between the receiver arms and having such a nature as to resist splaying of the receiver arms when theclosure 527 is advanced between the receiver arms. - The
shank 530 and thereceiver 531 may be attached in a variety of ways. For example, a threaded capture connection as described in U.S. Patent Pub. No. 2007/0055244, and incorporated by reference herein, may be used wherein the bone screw shank includes an outer helical thread mateable with an inner helical thread of a retaining structure disposed within the receiver. Theshank 530 of the illustratedbone screw 525 is top loaded into thereceiver 531 and includes anupper portion 536 that has a partially spherical surface that is slidingly mateable with a cooperating inner surface of thereceiver 531, allowing for a wide range of pivotal movement between theshank 530 and thereceiver 531. Top or bottom loaded polyaxial bone screws for use with theassembly 501 may include other types of capture connections, including but not limited to, other threadably connected, spline connected, or cam connected shank upper portions mateable with a retainer structure or ring that is in turn slidingly mateable with the inner surface of thereceiver 531, frictional connections utilizing frusto-conical or polyhedral capture structures, and other types of integral top or downloadable shanks. Also, as indicated above, polyaxial and other bone screws for use with connecting members of the invention may have bone screw shanks that directly engage the elongate connecting member or, as illustrated, include at least one compression member, such as thelower insert 538 that includes a partially spherical base that engages the substantially spherical upper portion of thebone screw shank 536 and also engages the boneanchor attachment portion 508 or thesleeve 512 to securely hold the connectingmember assembly 501 within thereceiver 531 and/or cooperate with theclosure structure 527 to fix thebone screw shank 530 at a desired angle with respect to thebone screw receiver 531. As illustrated inFIG. 38 and also shown inFIG. 48 , theinsert 538 includes spaced parallel walls disposed perpendicular to a bottom seating surface for closely holding the flat surfacedanchor attachment portion 508 or the flat surfacedsleeve 512 at a location slightly spaced from the squared off opening of thereceiver 531. - Although the
closure structure 527 for use with theassembly 501 of the present invention is illustrated with thepolyaxial bone screw 525 having an open receiver orhead 531, it foreseen that a variety of closure structures may be used in conjunction with any type of medical implant having an open or closed head or receiver, including monoaxial bone screws, hinged bone screws, hooks and the like used in spinal surgery. - To provide a biologically active interface with the bone, the threaded
shank 530 may be coated, perforated, made porous or otherwise treated. The treatment may include, but is not limited to a plasma spray coating or other type of coating of a metal or, for example, a calcium phosphate; or a roughening, perforation or indentation in the shank surface, such as by sputtering, sand blasting or acid etching, that allows for bony ingrowth or ongrowth. Certain metal coatings act as a scaffold for bone ingrowth. Bio-ceramic calcium phosphate coatings include, but are not limited to: alpha-tri-calcium phosphate and beta-tri-calcium phosphate (Ca3(PO4)2, tetra-calcium phosphate (Ca4P2O9), amorphous calcium phosphate and hydroxyapatite (Ca10(PO4)6(OH)2). Coating with hydroxyapatite, for example, is desirable as hydroxyapatite is chemically similar to bone with respect to mineral content and has been identified as being bioactive and thus not only supportive of bone ingrowth, but actively taking part in bone bonding. - With further reference to
FIG. 38 , theclosure structure 527 can be any of a variety of different types of closure structures for use in conjunction with the present invention with suitable mating structure on the interior surface of the upstanding arms of thereceiver 531. The illustratedclosure structure 527 is rotatable between the spaced arms, but it is foreseen that it could be a slide-in closure structure. The illustratedclosure structure 527 is substantially cylindrical and includes an outer helically wound guide and advancement structure in the form of a flange form that may take a variety of forms, including those described in Applicant's U.S. Pat. No. 6,726,689, the disclosure of which is incorporated herein by reference. It is also foreseen that according to the invention the closure structure guide and advancement structure could alternatively be a buttress thread, a square thread, a reverse angle thread or other thread like or non-thread like helically wound advancement structure for operably guiding under rotation and advancing theclosure structure 527 downward between the receiver arms and having such a nature as to resist splaying of the arms when theclosure structure 527 is advanced into the squared off U-shaped channel formed by the arms. Theclosure 527 may further include an inner set screw with an internal drive in the form of an aperture utilized for assembly of the set screw and removal of theentire closure 527. It is foreseen that the closure structure may alternatively include a non-helically wound locking or cam structure that may also include a flanged lip. It is also foreseen that theclosure structure 527 may alternatively include an external drive, such as a break-off head designed to allow such a head to break from a base of the closure at a preselected torque, for example, 70 to 140 inch pounds. Such a closure structure would also include a base having an internal drive to be used for closure removal. In the illustrated embodiments, theclosure 527 has a planar bottom surface that engages theinsert 538 as well as thebone anchor portion 508 or thesleeve 512 for consistent secure locking of the polyaxial screw mechanism, theinsert 538 pressing against the shankupper portion 536 that in turn presses against an inner surface of thereceiver 531. It is also foreseen that the closure structure may have a roughened or point and rim structure to aid in frictionally engaging the longitudinal connecting member. - Returning to the longitudinal connecting
member assembly 501 illustrated inFIGS. 25-38 , theassembly 501 is elongate, with theinner core 506 being a substantially solid, smooth and uniform bar of substantially square or rectangular cross-section. Thecore 506 may have a variety of cross-sectional geometries including polygonal and curvate. It is preferred that the cross-section be non-circular. However, a curvate cross-section, such as an oval or elliptical shape is acceptable. As will be described in greater detail below, the non-circular shape of the core 506 advantageously provides for torsion control of the assembly whereas a similar assembly made with a core of a circular cross section may tend to slip or rotate with respect to the other components of theassembly 501 when theassembly 501 is placed under torsional forces. Such a connecting member may require further structure in the form of pegs, pins or adhesives to more firmly connect an anchor member (similar to theanchor 504 but with circular cross-section) with an outer spacer (similar to thespacer 510 but with circular cross-section), for example. - The
anchor attachment portion 508 may be made from metal, metal alloys or other suitable materials, including plastic polymers such as polyetheretherketone (PEEK), ultra-high-molecular weight-polyethylene (UHMWP), polyurethanes and composites, including composites containing carbon fiber. It is noted that although ananchor member 504 is illustrated in which thecomponents core extension 506 and theanchor attachment portion 508 may be made from different materials, for example, thecore extension 506 may be made out of PEEK and fixed or adhered to a boneanchor attachment portion 508 made out of titanium. Thecore 506 andattachment portion 508 each include a small central lumen or through-bore 540 extending along the central axis AA. Thelumen 540 may be used as a passage through theentire assembly 501 interior for a length of a guide wire for aiding insertion of theassembly 501 between implantedbone screws 525 in a percutaneous or less invasive procedure. - With particular reference to
FIGS. 27-29 , theanchor member 504 is substantially bar-shaped along an entire length thereof along the axis AA and includes at least two or more rectangular cross-sections along the length thereof. The illustratedmember 504 includes the slender and thus moreflexible core 506 of a first rectangular cross-section that is illustrated in the drawings as having a square cross-section with four outerplanar surfaces 543. Thecore 506 terminates at anend 544. Prior to final assembly, thecore 506 is typically of a length greater than that shown in the drawing figures so that the core 6 may be grasped by a tool (not shown) near theend 544 and pulled along the axis AA in a direction away from theanchor attachment portion 508 in order to place tension on thecore 506. Alternatively, thecore 506 may be grasped by a tool near theend 544 during compression of thespacer 510 and/orbumper 518 and crimping of themember 520. As will be described in greater detail below, after removal of the tools, thespacer 510 andbumper 518 expand along the axis AA, placing thecore extension 506 in tension. - The bone
anchor attachment portion 508 that is integral with thecore extension 506 has a second rectangular cross-section that is larger than thecore 506 cross-section and thus theportion 508 is more rigid than thecore 506. Also with reference toFIGS. 25-29 , between the core 506 and theportion 508 is a buttressplate 546 that has a rectangular cross-section that is larger than the cross-section of theattachment portion 508. The buttressplate 546 is integral with and disposed between the core 506 and theportion 508. Although the illustratedanchor member 504 is substantially rectangular, it is foreseen that thecore 506, theportion 508 and theplate 546 may have other forms, including but not limited to oval and square cross-sections as well as other curved or polygonal shapes. The boneanchor attachment portion 508 is of a length along the axis AA for cooperating with at least one and up to a plurality of bone attachment members, such as the bone screws 525, hooks or other types of bone anchors. Theportion 508 is substantially solid and rigid, with opposedplanar surfaces 548 and perpendicular cooperating opposedplanar surfaces 550. Thesurfaces end 551. In the illustrated embodiment, a distance between thesurfaces 548 is slightly greater than a distance between thesurfaces 550. This is advantageous in situations wherein a relativelystiff bar 508 is desired but space considerations such as vertebrae and tooling placement require a more slender elongate connector. - The buttress
plate 546 includes a first substantially flat andannular face 552 facing away from thecore 506 and an opposed parallel substantiallyflat face 554 facing toward thecore 506. The faces 552 and 554 are disposed substantially perpendicular to the axis AA. Anouter surface 556 of rectangular cross-section extends between thefaces surfaces 543 of the core 506 with the substantiallyflat face 554 of the buttressplate 546. - With particular reference to
FIGS. 26 , 32 and 33, thesleeve 512 is sized and shaped to be slidingly received over thecore 506 along the axis AA and has a length measured along the axis AA that is sufficient for the attachment of at least onebone screw 525 thereon. Similar to theanchor member 504, thesleeve 512 may be made from metal, metal alloys or other suitable materials, including plastic polymers such as polyetheretherketone (PEEK), ultra-high-molecular weight-polyethylene (UHMWP), polyurethanes and composites, including composites containing carbon fiber. Thesleeve 512 may be made of the same material as the cooperatingcore 506, for example, theanchor member 504 and thesleeve 512 may be made from PEEK; or, for example, thecore 506 may be made from one material, such as PEEK, while thesleeve 512 may be made from another material, such as a metal (e.g. stainless steel or titanium). In order to have low or no wear debris, thesleeve 512 inner surfaces and/or cooperatingcore 506 outer surfaces may be coated with an ultra thin, ultra hard, ultra slick and ultra smooth coating, such as may be obtained from ion bonding techniques and/or other gas or chemical treatments. - The illustrated
sleeve 512 has a rectangular cross-section taken perpendicular to the axis AA, having outer opposed planar anchor attachment surfaces 560 and cooperating perpendicular opposed planar attachment surfaces 562. The illustratedsleeve 512 rectangular cross-section is identical or substantially similar to the rectangular cross-section formed by thesurfaces anchor attachment portion 508. Thesleeve 512 further includes inner opposedplanar surfaces 564 and cooperating perpendicular opposedplanar surfaces 566 that define a through-bore for the passage of the core 506 therethrough. In the illustrated embodiment, thesurfaces surfaces 543 of thecore 506. Thesleeve 512 further includes aplate 570 at an end thereof. Theillustrated end plate 570 has a rectangular cross-section perpendicular to the axis AA partially defined by outerplanar surfaces 574. Thesurfaces 574 are sized and shaped to be identical or substantially similar to thesurfaces 556 of theplate 546 of theanchor member 504. Theplate 570 has aplanar surface 575 perpendicular to the axis AA and an opposed terminalplanar surface 576. Thesurfaces planar surface 578. - With reference to
FIGS. 25-27 , theelastic spacer 510 and theelastic bumper 518 are sized and shaped to be slidingly received over thecore 506 and may be made from a variety of elastic materials, including, but not limited to natural or synthetic elastomers such as polyisoprene (natural rubber), and synthetic polymers, copolymers, and thermoplastic elastomers, for example, polyurethane elastomers such as polycarbonate-urethane elastomers. In order to have low or no wear debris, thespacer 510 and thebumper 518 inner and side surfaces may also be coated with an ultra thin, ultra hard, ultra slick and ultra smooth coating, such as may be obtained from ion bonding techniques and/or other gas or chemical treatments. - The illustrated
spacer 510 advantageously closely slidingly mates and cooperates with thecore 506 of theanchor member 504, providing limitation and protection of axial movement and torsional control of the core 506 located between bone screws 525. With particular reference toFIGS. 26 , 30 and 31, the illustratedspacer 510 has a pair of opposed planarouter surface 580 and perpendicular opposed planar cooperating surfaces 582. Thesurfaces plates spacer 510 also includesinner surfaces 584 of substantially the same width forming a lumen or through bore of substantially rectangular cross-section with respect the axis AA. In the illustrated embodiment, the cross-section is substantially square and slightly larger than the substantially square cross-section of thecore 506. Theinternal surfaces 584 are further defined by a flared outwardly extendingsurface 586 sized and shaped for cooperating with thesurface 558 of theanchor member 504. Thespacer 510 includes opposed substantially planar end surfaces 588 and 589. The flaredsurface 586 terminates at theend surface 588. When cooperating with thecore 506, the end surfaces 588 and 589 are substantially perpendicular to the axis AA. It is foreseen that in some embodiments, thespacer 510 may be of circular, square, or other outer cross-sectional shapes including curved or polygonal shapes. In the illustrated embodiment, thespacer 510 further includes acompression groove 590. Spacers according to the invention may include one, none or any desired number ofgrooves 590 that allow for some additional compression of thespacer 510 when pressed upon in an axial direction by theplates groove 590 is substantially uniform and formed in theexternal surfaces internal surfaces 584. The size of theinternal surfaces 584 allow for some axially directed sliding movement of thespacer 510 with respect to the core surfaces 543 but limits any rotation of thespacer 510 about the axis AA and thus limits twisting movements between theanchor 504, thesleeve 512 and thespacer 510. - With particular reference to
FIGS. 25-27 and 34-35, the illustratedbumper 518 is substantially square in cross-section in an operational direction perpendicular to the axis AA. Thebumper 518 includes outerplanar surfaces 592 and an inner bore also of substantially square cross-section with respect to the axis AA, the bore formed by innerplanar surfaces 594 sized and shaped to be slightly larger than thesurfaces 543 defining thecore 506. Thesurfaces bumper 518 further includes acompression groove 600 that is similar in form and function to thecompression groove 590 described previously herein with respect to thespacer 510. Thebumper 518 is sized and shaped to slidingly receive thecore 506 through theinner surface 594. Thebumper 518 is preferably made from an elastomeric material such as polyurethane. Thebumper 518 operatively provides axial tension on thecore 506 as will be described in greater detail below. - With particular reference to
FIGS. 25-27 and 36-37, the crimpingmember 520 is substantially square in cross-section taken in a direction perpendicular to the axis AA and includes four substantially planarouter surfaces 602. Four planarinner surfaces 604 form a through bore also of substantially square cross-section, sized and shaped to closely slidingly receive theplanar surfaces 543 of thecore 506 along the axis AA. Thesurfaces member 520 further includes a pair of opposed crimp orcompression grooves 610 that are pressable and deformable inwardly toward the axis AA upon final tensioning of thecore 506 and/or compression of thespacer 510 and thebumper 518 during assembly of theassembly 501. The crimpingmember 520 is preferably made from a stiff, but deformable material, including, but not limited to, metals and metal alloys. - The illustrated dynamic connecting
member assembly 501 having apre-tensioned core extension 506 cooperates with at least two bone anchors, such as the polyaxial bone screws, generally 525 as shown inFIG. 38 . In use, the bone screws 525 are implanted into vertebrae (not shown). Each vertebra may be pre-drilled to minimize stressing the bone. Furthermore, when a cannulated bone screw shank is utilized, each vertebra will have a guide wire or pin inserted therein that is shaped for the bone screw cannula of thebone screw shank 530 and provides a guide for the placement and angle of theshank 530 with respect to the cooperating vertebra. A further tap hole may be made and theshank 530 is then driven into the vertebra by rotation of a driving tool (not shown) that engages a driving feature on or near a top portion of theshank 530. It is foreseen that both thescrews 525 and the longitudinal connectingmember assembly 501 may be inserted in a conventional, percutaneous or other minimally invasive surgical manner. - With particular reference to
FIGS. 25-27 , the longitudinal connectingmember assembly 501 is assembled to provide apre-tensioned core 506 andpre-compressed spacer 510 andbumper 518 prior to implanting theassembly 501 in a patient. This is accomplished by first providing theanchor member 504 that has a core 506 that is longer in the axial direction AA than the core 506 illustrated in the drawing figures. Thespacer 510 is first loaded onto thecore 506 by inserting thecore 506end 544 into the bore defined by theinner surfaces 584 with thespacer end face 588 directed toward the buttressplate 546. Thespacer 510 is moved along thecore 506 until thesurface 586 contacts thesurface 558. Thesleeve 512 is then threaded onto thecore 506 with theface 576 of theplate 570 facing theend surface 589 of thespacer 510. Thecore 506 is received in the bore defined by the innerplanar surfaces sleeve 512 is moved along thecore 506 until theplate surface 576 abuts thespacer surface 589. Thebumper 518 is thereafter loaded onto thecore 506 by inserting thecore 506end 544 into the bore defined by theinner surfaces 594 with theface 596 facing the toward thesurface 578 of thesleeve 512. Thebumper 518 is moved along thecore 506 until thesurface 596 contacts thesurface 578. The crimpingmember 520 is thereafter loaded onto thecore 506 by inserting thecore 506end 544 into the bore defined by theinner surfaces 604 with theface 606 facing the toward thesurface 598 of thebumper 518. The crimpingmember 520 is moved along thecore 506 until thesurface 606 contacts thesurface 598. It is noted that due to the symmetrical nature of thesleeve 512, the spacer 514, thebumper 518 and the crimpingmember 520, these components may be loaded onto the core 506 from either side thereof. However, if, as in the illustrated embodiment, the boneanchor attachment portion 508, thespacer 510 and thesleeve 512 are not of square cross-section,such components core 506 in alignment with thesurfaces FIGS. 25 and 26 , in the illustrated embodiment, such alignment places thesurfaces surfaces surfaces - After the crimping
member 520 is loaded onto thecore 506, manipulation tools (not shown) are used to grasp thecore 506 near theend 544 and at the boneanchor attachment portion 508, placing tension on thecore 506. Furthermore, thespacer 510, thesleeve 512, thebumper 518 and the crimpingmember 520 are moved toward the buttressplate 540 and into contact with one another. Alternatively, or in addition, axial compressive force is placed on the components loaded on thecore 506, followed by deforming the crimping member at thecrimp grooves 610 and against thecore 506. When the manipulation tools are released, the crimpingmember 520, now firmly and fixedly attached to thecore 506 holds thespacer 510 and thebumper 518 in compression and the spacers and bumper place axial tension forces on thecore 506, resulting in a dynamic relationship between the core 506 and thespacer 510 andbumper 518. The tension on thecore 506 is advantageously balanced and uniform as thespacer 510 is slidable with respect to thecore 506, but also are limited by the buttress plate of theanchor member 504 and end plate of thesleeve 512. Furthermore, thebumper 518 that is compressed between thesleeve surface 578 and the crimpingmember surface 606 is also slidable with respect to thecore 506. Thespacer 510 and thebumper 518 place a distractive force on thecore 506 along the axis AA and between the buttressplate 546 and the crimpingmember 520, but also are movable with respect to thecore 506, thus being able to respond to jolting and other body movements and thereafter spring back into an originally set location. - The
sleeve 512 may compress slightly, but is more rigid than thespacer 510 andbumper 518 and thus keeps thespacers 510 andbumper 518 in an approximate desired axially spaced relation. However, thespacer 510 also advantageously slides along thecore 506 in response to outside forces. Thecore 506 is then trimmed to be approximately flush with theend surface 608 of the crimpingmember 520. - With reference to
FIG. 38 , the pre-loaded connectingmember assembly 501 is eventually positioned in an open, percutaneous or other less invasive manner in cooperation with the at least twobone screws 525 with thespacer 510 being disposed between and spaced from the bone screws 525 and with theportion 508 andsleeve 512 each being located within a squared-off U-shaped channel of a cooperatingbone screw receiver 531. Once a desired position is attained, aclosure structure 527 is then inserted into and advanced between the arms of each of thebone screw receivers 531 until appropriately tightened. - The
assembly 501 is thus substantially dynamically loaded and oriented relative to the cooperating vertebra, providing relief (e.g., shock absorption) and protected movement with respect to flexion, extension, distraction and compressive forces placed on theassembly 501 and the connected bone screws 525. Theslender core extension 506 allows for some twisting providing some relief for torsional stresses. However, the fact that thecore 506 is of a non-round cross-section and cooperates with through bores of the other assembly components that are also non-round and closely slidingly mate with thecore 506 also advantageously provides limits to rotational or twisting movement of theassembly 501 in response to torsional forces. Furthermore, thecompressed spacer 510 places some limits on torsional movement as well as bending movement, to provide spinal support. The pre-loaded core 506 (in tension) andspacer 510 and bumper 518 (in compression) allow for compression and some extension of theassembly 501 located between the twobone screws 525, e.g., shock absorption. - If removal of the
assembly 501 from any of thebone screw assemblies 525 is necessary, or if it is desired to release theassembly 501 at a particular location, disassembly is accomplished by using the driving tool (not shown) with a driving formation cooperating with theclosure structure 527 internal drive or cooperating set screw internal drive to rotate and remove theclosure structure 527 from thereceiver 531. Disassembly is then accomplished in reverse order to the procedure described previously herein for assembly. - Eventually, if the spine requires more rigid support, the connecting
member assembly 501 according to the invention may be removed and replaced with another longitudinal connecting member, such as a solid cylindrical or bar-like rod, having the same diameter or width as the width of the bar-like portion 508 and thesleeve 512, utilizing thesame receivers 531 and the same orsimilar closure structures 527. Alternatively, if less support is eventually required, a less rigid, more flexible assembly, for example, anassembly 501 having components made of a more flexible material, but with the same size sleeves as theassembly 501, may replace theassembly 501, also utilizing the same bone screws 525. - With reference to
FIGS. 39-44 , another embodiment of a dynamic longitudinal connecting member of the invention, generally 701, includes an anchor member, generally 704, having an elongate segment orinner core 706 and a boneanchor attachment portion 708; anelastic spacer 710; a sleeve 716; anelastic bumper 718; and a crimpingmember 770; all substantially symmetrically aligned with respect to a central curvate axis BB of theanchor member 704 as unlike thecore 506 of theassembly 501, thecore 706 of theassembly 701 is bent primarily at a location near theportion 708. Theelongate core 706 of theanchor member 704 is receivable within thespacer 710, the sleeve 716, thebumper 718 and the crimpingmember 720. Thus, the central curvate axis BB of theanchor member 704 is also the axis of the fully assembledassembly 701. When fully assembled and fixed with all components fixed in position as shown in FIG. 39, theinner core 706 is in tension and thespacer 710 and thebumper 718 are in compression. - In the illustrated embodiment, the
anchor member 704 is substantially similar to theanchor member 504 previously described herein with respect to theassembly 501. Therefore, themember 704 includes thecore 706, the boneanchor attachment portion 708 and an integral buttressplate 746 identical or substantially similar in size and shape to therespective core 506,attachment portion 508 and buttressplate 546 of theanchor member 504 previously described herein. Themember 704 differs from themember 504 only in the fact that thecore 706 is bent adjacent the buttressplate 746. - The
sleeve 712 is identical or substantially similar to thesleeve 512 illustrated inFIGS. 32 and 33 and previously described herein, having an outerplanar surfaces planar surfaces end plate 770 identical or substantially similar to the respectiveouter surfaces inner surfaces end plate 570 of thesleeve 512 previously described herein. Thebumper 718 and the crimpingmember 720 are identical or substantially similar to therespective bumper 518 and the crimpingmember 520 previously described herein with respect to theassembly 501. - The
spacer 710 is operatively located between the buttressplate 746 and thesleeve plate 770 in a manner similar to thespacer 510 located between theplates assembly 501. Thespacer 710 is also made from materials similar to the materials from which thespacer 10 is made. Thespacer 710 further includes innerplanar surfaces 784 and aflanged surface 786 forming a through bore for receiving thecore 706,such surfaces surfaces spacer 510 with the exception that the through bore may be further modified to follow the curvature of thebent core 706. Also, thespacer 710 is of a different shape than thespacer 510. Thespacer 710 includes a pair of opposedplanar surfaces 790 that are trapezoidal in shape. Thesurfaces 790 run parallel to the through bore formed by theplanar surfaces 784, such bore terminating at opposed load-bearing end surfaces 792 and 794. Thesurfaces surface 796 and sloping in a direction away from one another at a larger bottom (operatively anterior)surface 798. It is noted that also according to the invention thesurface 796 may be placed in an anterior position and thesurface 798 placed in a posterior position with respect to the spine if desired to correct spinal kyphosis. In other embodiments of the invention thecore 706 andspacer 710 may be bent, sized and shaped for the correction of other spinal deformities, such as scoliosis, for example. - The
assembly 701 is assembled in a manner substantially similar to the manner of assembly previously described herein with respect to theassembly 501. Therefore, thecore 706 is first received within a through bore of thespacer 710 formed by thesurfaces 784, then within the innerplanar surfaces sleeve 712, followed by an inner through bore of thebumper 718 and then an inner through bore of the crimpingmember 720. Similar to what has been described previously with respect to theassembly 1, thecore 706 is initially of a longer length measured along the axis BB than is shown in the drawing figures, allowing for a manipulation tool to grasp thecore 706 near an end thereof that extends through the crimping member bore. Thecore 706 is tensioned and/or thespacer 710 andbumper 720 are compressed, followed by deformation of the crimpingmember 720 against thecore 706. Thecore 706 is then trimmed substantially flush to the crimpingmember 720. The assembly is now in dynamic relationship with thecore 706 being in tension while thespacer 710 that is slidable with respect to thecore 706 is compressed between theplates bumper 718 that is also slidable with respect to thecore 706 is compressed between thesleeve 712 and the crimpingmember 720; thespacer 710 and thebumper 718 placing a distractive force on thecore 706 along the axis BB and between the buttressplate 746 and the crimpingmember 720. Theassembly 701 may then be implanted, cooperating with a pair of bone screws 525 as illustrated inFIG. 43 and as previously described herein with respect to theassembly 501. Unlike theassembly 501 illustrated inFIG. 38 thebent core 706 and cooperatingtrapezoidal spacer 710 provide additional support or correction to a spine, for example, when correcting spinal lordosis. With reference toFIG. 44 , theassembly 701 and cooperating bone screws 525 ofFIG. 43 are shown under a load that causes thecore 706 to straighten and further compresses thespacer 710 resulting in a bulging of the flexible spacer at theanterior surface 798. - With reference to
FIGS. 45-49 , another embodiment of a dynamic longitudinal connecting member assembly, generally 801 is illustrated. Theassembly 801 includes ananchor member 804 having aninner core 806 and a boneanchor attachment portion 808; atrapezoidal spacer 810, asleeve 812, asecond spacer 814, asecond sleeve 816, abumper 818 and a crimpingmember 820. The illustratedspacer 810,sleeve 812,bumper 818 and crimpingmember 820 are identical or substantially similar to therespective spacer 710,sleeve 712,bumper 718 and crimpingmember 720 previously described herein with respect to theassembly 701. Theanchor member 804 is identical to theanchor member 704 with the exception that the boneanchor attachment portion 808 is of a greater length to receive threebone screw receivers 531 therealong while theportion 708 is sized to receive twobone screw receivers 531. Thesecond spacer 814 is substantially similar in shape and function as thespacer 510 previously described herein with respect to theassembly 501 with the exception that the through bore defined by the inner planar surfaces is uniform (seeFIG. 46 ) and does not require a flared portion for cooperating with thecore 806 as thespacer 814 is disposed along a uniform mid-section of thecore 806. - The
sleeve 816 is for the most part similar to thesleeve 812, thesleeve 712 and thesleeve 512 of the previously described embodiments, having outerplanar surfaces planar surfaces core 806 and anend plate 870 identical or substantially similar to the respectiveouter surfaces inner surfaces end plate 570 of thesleeve 512 previously described herein with respect to theassembly 501. Additionally, thesleeve 816 has anopposite end plate 871 spaced from and parallel to theend plate 870. - The
assembly 801 is assembled in a manner substantially similar to the manner of assembly previously described herein with respect to theassembly 701. Thecore 806 is first received within a through bore of thespacer 810, then within the innerplanar surfaces sleeve 816, followed by an inner through bore of thespacer 814 and then a through bore of thesleeve 812. Thereafter, thecore 806 is received in an inner through bore of thebumper 818 and then an inner through bore of the crimpingmember 820. Similar to what has been described previously with respect to theassemblies core 806 is initially of a longer length than is shown in the drawing figures, allowing for a manipulation tool to grasp the core near an end thereof that extends through the crimping member bore. Thecore 806 is tensioned and/or thespacers bumper 818 are compressed, followed by deformation of the crimpingmember 820 against thecore 806. Thecore 806 is then trimmed substantially flush to the crimpingmember 820. The assembly is now in dynamic relationship with thecore 806 being in tension while thespacers core 806 are compressed and thebumper 818 that is also slidable with respect to thecore 806 is compressed between thesleeve 812 and the crimpingmember 820; thespacers bumper 818 placing a distractive force on thecore 806 along an elongate axis thereof. Theassembly 801 may then be implanted, cooperating with a threebone screws 525 as illustrated inFIG. 48 and as previously described herein with respect to theassembly 501. Unlike theassembly 501 illustrated inFIG. 38 thebent core 806 and cooperatingtrapezoidal spacer 810 provide additional support or correction to a spine, for example, when correcting spinal lordosis. With reference toFIG. 49 , theassembly 801 and cooperating bone screws 525 ofFIG. 48 are shown under a load that causes thecore 806 to straighten and further compresses thespacer 810 resulting in a bulging of an anterior surface of thespacer 810. - It is foreseen that longitudinal connecting member assemblies according to the invention may be of a variety of lengths for cooperation with a plurality of bone screws 525, either along an attachment portion, such as the
portion 808 or along dynamic portions that include one or more spacers and one or more sleeves, such as thesleeves - As another example of an elongate dynamic connecting member of the invention for use with at least three
bone screws 525,FIGS. 50-52 illustrate another embodiment of a dynamic longitudinal connecting member assembly, generally 901. Theassembly 901 includes ananchor member 904 having aninner core 906 and a boneanchor attachment portion 908; first and secondtrapezoidal spacers sleeve 912, asecond sleeve 916, abumper 918 and a crimpingmember 920. The illustratedtrapezoidal spacers trapezoidal spacer 710 previously described herein with respect to theassembly 701. Thesecond spacer 910B would not require an inner flared portion as such spacer is placed along a uniform mid-section of thecore 906. Thesleeves respective sleeves assembly 801. Thebumper 918 and crimpingmember 920 are identical or substantially similar to therespective bumpers members anchor member 904 is identical to theanchor member 804 with the exception that thecore 906 is bent at two locations corresponding to the operative placement of thetrapezoidal spacers - The
assembly 901 is assembled in a manner substantially similar to the manner of assembly previously described herein with respect to theassembly 801. Thecore 906 is first received within a through bore of the spacer 910, then within the inner planar surfaces defining the inner through bore of thesleeve 916, followed by an inner through bore of thespacer 910A and then a through bore of thesleeve 912. Thereafter, thecore 906 is received in an inner through bore of thebumper 918 and then an inner through bore of the crimpingmember 920. Similar to what has been described previously with respect to theassemblies core 906 is initially of a longer length than is shown in the drawing figures, allowing for a manipulation tool to grasp thecore 906 near an end thereof that extends through the crimping member bore. Thecore 906 is tensioned and/or thespacers bumper 918 are compressed, followed by deformation of the crimpingmember 920 against thecore 906. Thecore 906 is then trimmed substantially flush to the crimpingmember 920. The assembly is now in dynamic relationship with thecore 906 being in tension while thespacers core 906 are compressed and thebumper 918 that is also slidable with respect to thecore 906 is compressed between thesleeve 912 and the crimpingmember 920; thespacers bumper 918 placing a distractive force on the core 946 along an elongate axis thereof. Theassembly 901 may then be implanted, cooperating with a threebone screws 525 as illustrated inFIG. 51 and as previously described herein with respect to theassembly 501. Similar to theassembly 801, thebent core 906 and cooperatingtrapezoidal spacers FIG. 52 , theassembly 901 and cooperating bone screws 525 ofFIG. 51 are shown under a load that causes thecore 906 to straighten and further compresses thespacers spacers - It is to be understood that while certain forms of the present invention have been illustrated and described herein, it is not to be limited to the specific forms or arrangement of parts described and shown.
Claims (18)
1. In a medical implant assembly having at least first and second bone anchor attachment structures cooperating with a longitudinal connecting member, the improvement wherein the longitudinal connecting member comprises:
a) an anchor member portion in engagement with the first of the bone anchor attachment structures, the anchor member portion having a pre-tensioned member portion of reduced diameter extending from an end thereof;
b) a compressible outer spacer, the pre-tensioned member portion being received in the spacer, the spacer being positioned between the first and second bone anchor attachment structures; and
c) a sleeve, the pre-tensioned member portion being received within the sleeve and in slidable relationship therewith, the sleeve being in engagement with a second of the bone anchor attachment structures.
2. The improvement of claim 1 further comprising an elastic bumper, the pre-tensioned member portion being received within the bumper and the bumper engaging the sleeve.
3. The improvement of claim 1 further comprising a fixation structure secured to the pre-tensioned member portion at an end thereof opposite the anchor member portion.
4. The improvement of claim 1 wherein the pre-tensioned member portion is fixed to the anchor member portion at an end thereof.
5. In a medical implant assembly having at least first and second bone attachment structures cooperating with a longitudinal connecting member, the improvement wherein the longitudinal connecting member comprises:
a) an anchor member portion in engagement with the first of the bone attachment structures, the anchor member portion having a pre-tensioned bendable core extension of reduced diameter along a length thereof, the core extension attached to and extending from the anchor member portion and having a linear and a non-linear configuration;
b) a compressible outer spacer, the core extension being received in the spacer, the spacer being positioned between the first and second bone attachment structures; and
c) a sleeve, the core extension being received within the sleeve and in slidable relationship therewith, the sleeve being in engagement with the second of the bone attachment structures.
6. In a medical implant assembly having at least first and second bone anchor attachment structures cooperating with a longitudinal connecting member, the improvement wherein the longitudinal connecting member comprises:
a) an anchor member portion in engagement with a first of the bone anchor attachment structures, the anchor member portion having a pre-tensioned member portion of reduced diameter extending from an end thereof;
b) a compressible outer spacer, the pre-tensioned member portion being received in the spacer, the spacer being positioned between the at least two bone anchor attachment structures; and
c) a sleeve, the pre-tensioned member portion being received within the sleeve and in slidable relationship therewith, the sleeve being in engagement with the second of the bone anchor attachment structures.
7. The improvement of claim 6 further comprising an elastic bumper, the pre-tensioned member portion being received within the bumper and the bumper engaging the sleeve.
8. The improvement of claim 6 further comprising a fixation structure secured to the pre-tensioned member portion at an end thereof opposite the anchor member portion.
9. The improvement of claim 6 wherein the pre-tensioned member portion is fixed to the anchor member portion at an end thereof.
10. In a medical implant assembly having at least first and second bone attachment structures cooperating with a longitudinal connecting member, the improvement wherein the longitudinal connecting member comprises:
a) an anchor member portion in engagement with the first of the bone attachment structures, the anchor member portion having a pre-tensioned bendable core extension of reduced diameter along a length thereof, the core extension attached to and extending from the anchor member portion and having a linear and a non-linear configuration;
b) a compressible outer spacer, the core extension being received in the spacer, the spacer being positioned between the first and second bone attachment structures; and
c) a sleeve, the core extension being received within the sleeve and in slidable relationship therewith, the sleeve being in engagement with the second of the bone attachment structures.
11. A medical implant assembly with at least first and second bone attachment structures including:
a) a longitudinal connecting member having a stiff portion secured to at least the first bone attachment structure, the stiff portion being coaxial with a less stiff core extension portion of reduced width relative to the stiff portion, the core extension being in slidable relation with the second bone attachment structure;
b) a solid non-slitted outer spacer positioned entirely outside of the core extension and between the first and second bone attachment structures, the spacer being in slidable relation with the core extension; and
c) an end fixing structure and an elastic bumper, both the end fixing structure and the elastic bumper being positioned entirely outside of the second bone attachment structure, wherein the bumper is positioned around the core extension and between the fixing structure and the second bone attachment structure, and wherein the bumper is in slidable relation with the core extension; and wherein
d) the fixing structure is slidable on the core section, compressible against the bumper and securable to the core extension.
12. The assembly according to claim 11 , wherein the core extension is in tension.
13. The assembly according to claim 11 , wherein the core extension is maintained in tension by axial elastic distraction from the bumper.
14. The assembly according to claim 11 , wherein the core extension is made of at least one of a polymer, PEEK and a non-metal.
15. The assembly according to claim 11 , wherein at least one sleeve is positioned around and between the core extension and the bone attachment structure, the sleeve being secured to at least the bone attachment structure.
16. The assembly according to claim 11 , wherein the tensioned core extension is adapted to provide resilient bending stiffness for the longitudinal connecting member while cooperating with the bone attachment structures.
17. The according to claim 11 , wherein the end fixing structure is positioned entirely outside of the bumper.
18. The assembly according to claim 11 , wherein the bumper and the spacer are positioned entirely outside of the sleeve.
Priority Applications (4)
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US13/317,158 US20120035660A1 (en) | 2007-05-01 | 2011-10-11 | Dynamic stabilization connecting member with pre-tensioned solid core |
US15/197,247 US9931139B2 (en) | 2007-01-18 | 2016-06-29 | Dynamic stabilization connecting member with pre-tensioned solid core |
US15/943,257 US11224463B2 (en) | 2007-01-18 | 2018-04-02 | Dynamic stabilization connecting member with pre-tensioned flexible core member |
US17/578,144 US20220133359A1 (en) | 2007-01-18 | 2022-01-18 | Dynamic stabilization connecting member with pre-tensioned solid core member |
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US92711107P | 2007-05-01 | 2007-05-01 | |
US93256707P | 2007-05-31 | 2007-05-31 | |
US99406807P | 2007-09-17 | 2007-09-17 | |
US12/148,465 US10258382B2 (en) | 2007-01-18 | 2008-04-18 | Rod-cord dynamic connection assemblies with slidable bone anchor attachment members along the cord |
US12/156,260 US7951170B2 (en) | 2007-05-31 | 2008-05-30 | Dynamic stabilization connecting member with pre-tensioned solid core |
US13448008P | 2008-07-10 | 2008-07-10 | |
US13774308P | 2008-08-01 | 2008-08-01 | |
US12/459,492 US8366745B2 (en) | 2007-05-01 | 2009-07-01 | Dynamic stabilization assembly having pre-compressed spacers with differential displacements |
US13/317,158 US20120035660A1 (en) | 2007-05-01 | 2011-10-11 | Dynamic stabilization connecting member with pre-tensioned solid core |
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US15/197,247 Continuation US9931139B2 (en) | 2007-01-18 | 2016-06-29 | Dynamic stabilization connecting member with pre-tensioned solid core |
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US13/317,158 Abandoned US20120035660A1 (en) | 2007-01-18 | 2011-10-11 | Dynamic stabilization connecting member with pre-tensioned solid core |
US13/694,982 Abandoned US20130138153A1 (en) | 2007-05-01 | 2013-01-23 | Dynamic stabilization assembly having pre-compressed spacers with differential displacements |
US15/197,247 Active US9931139B2 (en) | 2007-01-18 | 2016-06-29 | Dynamic stabilization connecting member with pre-tensioned solid core |
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US15/197,247 Active US9931139B2 (en) | 2007-01-18 | 2016-06-29 | Dynamic stabilization connecting member with pre-tensioned solid core |
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US8535351B1 (en) * | 2008-06-09 | 2013-09-17 | Melvin Law | Dynamic spinal stabilization system |
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US9750540B2 (en) | 2007-01-26 | 2017-09-05 | Roger P. Jackson | Dynamic stabilization member with molded connection |
US9931139B2 (en) | 2007-01-18 | 2018-04-03 | Roger P. Jackson | Dynamic stabilization connecting member with pre-tensioned solid core |
US10130393B2 (en) | 2007-01-18 | 2018-11-20 | Roger P. Jackson | Dynamic stabilization members with elastic and inelastic sections |
US10258382B2 (en) | 2007-01-18 | 2019-04-16 | Roger P. Jackson | Rod-cord dynamic connection assemblies with slidable bone anchor attachment members along the cord |
US10383660B2 (en) | 2007-05-01 | 2019-08-20 | Roger P. Jackson | Soft stabilization assemblies with pretensioned cords |
US10470801B2 (en) | 2007-01-18 | 2019-11-12 | Roger P. Jackson | Dynamic spinal stabilization with rod-cord longitudinal connecting members |
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US11147597B2 (en) | 2004-02-27 | 2021-10-19 | Roger P Jackson | Dynamic spinal stabilization assemblies, tool set and method |
US11224463B2 (en) | 2007-01-18 | 2022-01-18 | Roger P. Jackson | Dynamic stabilization connecting member with pre-tensioned flexible core member |
US11241261B2 (en) | 2005-09-30 | 2022-02-08 | Roger P Jackson | Apparatus and method for soft spinal stabilization using a tensionable cord and releasable end structure |
US11707298B2 (en) | 2005-09-30 | 2023-07-25 | Roger P. Jackson | Dynamic spinal stabilization assembly with elastic bumpers and locking limited travel closure mechanisms |
US11751913B2 (en) | 2006-01-09 | 2023-09-12 | Roger P. Jackson | Longitudinal connecting member with sleeved tensioned cords and releasable end blocker-bumper |
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US7766915B2 (en) | 2004-02-27 | 2010-08-03 | Jackson Roger P | Dynamic fixation assemblies with inner core and outer coil-like member |
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Also Published As
Publication number | Publication date |
---|---|
US9931139B2 (en) | 2018-04-03 |
US8366745B2 (en) | 2013-02-05 |
US20160310171A1 (en) | 2016-10-27 |
US20130138153A1 (en) | 2013-05-30 |
US20090275985A1 (en) | 2009-11-05 |
WO2010005582A1 (en) | 2010-01-14 |
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