US20110071637A1 - System and methods for inserting a vertebral spacer - Google Patents
System and methods for inserting a vertebral spacer Download PDFInfo
- Publication number
- US20110071637A1 US20110071637A1 US12/826,776 US82677610A US2011071637A1 US 20110071637 A1 US20110071637 A1 US 20110071637A1 US 82677610 A US82677610 A US 82677610A US 2011071637 A1 US2011071637 A1 US 2011071637A1
- Authority
- US
- United States
- Prior art keywords
- vertebral spacer
- spacer
- vertebral
- insertion tool
- tool
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
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- A61F2/4611—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof of spinal prostheses
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- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2230/0002—Two-dimensional shapes, e.g. cross-sections
- A61F2230/0017—Angular shapes
- A61F2230/0026—Angular shapes trapezoidal
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2230/0063—Three-dimensional shapes
- A61F2230/0082—Three-dimensional shapes parallelepipedal
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
- A61F2310/00005—The prosthesis being constructed from a particular material
- A61F2310/00011—Metals or alloys
- A61F2310/00017—Iron- or Fe-based alloys, e.g. stainless steel
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
- A61F2310/00005—The prosthesis being constructed from a particular material
- A61F2310/00011—Metals or alloys
- A61F2310/00023—Titanium or titanium-based alloys, e.g. Ti-Ni alloys
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
- A61F2310/00005—The prosthesis being constructed from a particular material
- A61F2310/00011—Metals or alloys
- A61F2310/00029—Cobalt-based alloys, e.g. Co-Cr alloys or Vitallium
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
- A61F2310/00005—The prosthesis being constructed from a particular material
- A61F2310/00011—Metals or alloys
- A61F2310/00035—Other metals or alloys
- A61F2310/00137—Tungsten or W-based alloys
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
- A61F2310/00005—The prosthesis being constructed from a particular material
- A61F2310/00179—Ceramics or ceramic-like structures
- A61F2310/00293—Ceramics or ceramic-like structures containing a phosphorus-containing compound, e.g. apatite
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
- A61F2310/00005—The prosthesis being constructed from a particular material
- A61F2310/00353—Bone cement, e.g. polymethylmethacrylate or PMMA
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
- A61F2310/00005—The prosthesis being constructed from a particular material
- A61F2310/00359—Bone or bony tissue
Definitions
- the present invention generally relates to a vertebral spacer to be inserted into an intervertebral space, thereby supporting the spinal column of a patient.
- the present invention further relates to a system and methods for implanting the vertebral spacer into the spinal column and securing the spacer therein.
- the spinal column which is the central support to the vertebrate skeleton and a protective enclosure for the spinal cord, is a linear series of vertebral bones. Intervertebral discs separate and reduce friction between adjacent vertebrae and absorb compression forces applied to the spinal column. Spinal nerves that extend from each side of the spinal cord exit the column at intervertebral forama.
- a typical vertebra comprises an anterior body, and a posterior arch that surrounds the spinal cord lying within the vertebral foramen formed by the arch.
- the muscles that flex the spine are attached to three processes extending from the posterior arch.
- the intervertebral discs include the fibrillar cartilage of the anulus fibrosus, a fibrous ring, the center of which is filled with an elastic fibrogelatinous pulp that acts as a shock absorber.
- the outer third of the anulus fibrosus is innervated.
- the entire spinal column is united and strengthened by encapsulating ligaments.
- Back pain is one of the most significant problems facing the workforce in the United States today. It is a leading cause of sickness-related absenteeism and is the main cause of disability for people aged between 19 and 45. Published reports suggest that the economic cost is significant, treatment alone exceeding $80 billion annually. Although acute back pain is common and typically treated with analgesics, chronic pain may demand surgery for effective treatment.
- Back pain can occur from pinching or irritation of spinal nerves, compression of the spine, vertebral shifting relative to the spinal cord axis, and bone spur formation.
- the most common cause of disabling back pain stems from trauma to a intervertebral disc, resulting from mechanical shock, stress, tumors or degenerative disease, which may impair functioning of the disc and limit spinal mobility. In many cases, the disc is permanently damaged and the preferred treatment becomes partial or total excision.
- One vertebral spacer that may be inserted between adjacent vertebrae includes two opposing plates separated by a belleville washer or a modified belleville washer.
- the washer functions to provide a restorative force to mimic the natural functions of the disc of providing a shock absorber and mobility between adjacent vertebrae.
- mechanical devices intended to replicate intervertebral disc function have had only limited success.
- An alternative approach is a “cage” that maintains the space usually occupied by the disc to prevent the vertebrae from collapsing and impinging the nerve roots.
- Spinal fusion may be used to restrict motion occurring between two vertebrae due to spinal segmental instability. Fusing the vertebrae together, however, reduces the mechanical back pain by preventing the now immobile vertebrae from impinging on the spinal nerve.
- the disadvantage of such spacers is that stability is created at the expense of spinal flexibility.
- the posterior approach (from the back of the patient) encounters the spinous process, superior articular process, and the inferior articular process that must be removed before insertion of the disc replacement material into the intervertebral space. Excessive removal of the bony process triggers further degradation and impediment of the normal movement of the spine.
- the anterior approach to the spinal column is complicated by the internal organs that must be bypassed or circumvented to access the vertebrae.
- intervertebral spacers require preparation of the surfaces of the adjacent vertebrae to accommodate the spacer, causing significant tissue and bone trauma. For example, chiseling or drilling of the vertebral surface may be required to prepare a receiving slot. They may also require screwing the spacer into the intervertebral space, making installation difficult and increasing trauma to the vertebral tissue.
- Many spacers include complex geometries and are costly to manufacture. Examples of such geometrically complex spacers are described in U.S. Pat. No. 5,609,636 to Kohrs et al., U.S. Pat. No. 5,780,919 to Zdeblick et al., U.S. Pat. No. 5,865,848 to Baker and U.S. Pat. No. 5,776,196 to Matsuzaki et al. Many of these complex spacers may require screwing the spacer into the intervertebral space, thereby making installation difficult and traumatic to the vertebral tissue.
- the present invention provides a vertebral spacer having a simple geometry for supporting adjacent vertebrae after excision, at least partially or wholly, of an intervertebral disc.
- the spacer includes a body having a lower surface and an upper surface. The lower surface will be supported by a lower vertebra; the upper surface supports the adjacent upper vertebra.
- the body of the vertebral spacer of the present invention therefore, provides support between the two adjacent vertebrae and to the spinal column.
- the body of the vertebral spacer of the present invention additionally has an anterior face and a posterior face extending from the lower surface.
- the height of the anterior face of the body may be less than, or greater than, the height of the posterior face to maintain the curvature of the spine when the vertebral spacer is inserted between two vertebrae.
- the body of the vertebral spacer also includes at least one guiding groove suitable for engaging with an insertion tool for delivering the vertebral spacer to an intervertebral space.
- the present invention further provides a system for delivering a vertebral spacer to the spinal column of a patient, comprising an insertion tool with a channel; (b) an optional guiding tool for directing the insertion tool to a selected point of insertion of a vertebral spacer; (c) a pusher; (d) a vertebral spacer slideably disposed in the channel of the insertion tool; and (e) a cutting tool.
- the cutting tool can be slid into the channel of the insertion tool providing that the pusher and the vertebral spacer are not therein.
- the channel of the insertion tool is configured to slideably accept any of a vertebral spacer, a pusher, a vertebral spacer , or a cutting tool.
- the insertion tool further comprises a spacer guide or a plurality of spacer guides for engagement with a first guiding groove or a second guiding groove of a vertebral spacer.
- the spacer guide is a flange extending from the channel. In another embodiment, the spacer guide is two opposing flanges configured to slideably engage with a first guiding groove and a second guiding groove, respectively.
- the spacer guide is at least one rib longitudinally placed on the inner surface of the channel of the insertion tool.
- insertion tool of the present invention include spacer guides that may be, but are not limited to, a segmented longitudinal rib, or a linear series of protrusions, also on the inner surface of the channel.
- the present invention further provides a method for delivering a vertebral spacer to a patient, comprising the steps of inserting the insertion tool into an intervertebral space of the spinal column of a patient, engaging at least one guiding groove of a vertebral spacer with a space guide of the insertion tool, sliding a pusher into the channel of the insertion tool, advancing the pusher and thereby pushing the vertebral spacer into the intervertebral space and removing the pusher and the insertion tool from the patient.
- the method of the present invention may further comprise the optional step of inserting a guiding tool into an intervertebral space for directing the insertion tool into the intervertebral space.
- the insertion tool may be slid along the guide tool to a selected position suitable for insertion of a vertebral spacer in the intervertebral space.
- the guide tool is then extracted from the insertion tool leaving the insertion tool inserted between adjacent vertebrae.
- the cutting tool is optionally slid along the channel of the insertion tool to engage a vertebra and generally is used to chisel at least one vertebral space receiving slot in the vertebrae.
- the cutting tool is removed from the patient by sliding the cutting tool back through the channel of the insertion tool.
- a vertebral spacer may then be slideably engaged with the insertion tool, with a space guide on the insertion tool engaging with a guiding groove of the vertebral spacer.
- the pusher may be engaged and advanced along the channel, thereby delivering the vertebral spacer into the vertebral spacer receiving slot (or receiving slots) in the adjacent vertebrae. It is also contemplated that a vertebral spacer receiving slot may not be cut in the adjacent vertebrae and that the inserted vertebral spacer optionally may contact only the uncut surface of the vertebrae.
- One embodiment of the method of the present invention comprises the additional step of delivering a hardening biocompatible composition to the vertebral spacer.
- the hardening biocompatible composition may be used, for example, to bond the vertebral spacer to an adjacent vertebra or be an osteogenic composition to promote bone growth from the adjacent vertebrae into the vertebral spacer.
- the hardening biocompatible composition can be, for example, an organic polymer, a mineral composition such as a hydroxyapatite-based composition, methyl methacrylate, or the like, or a combination thereof.
- a hydroxyapatite-based composition is especially useful in the context of the present invention for promoting osteocyte growth and bone deposition.
- FIG. 1A illustrates an embodiment of the vertebral spacer according to the present invention having a first guiding groove and a second guiding groove.
- FIG. 1B illustrates an embodiment of the vertebral spacer according to the present invention having protrusions on the upper surface thereof.
- FIG. 2A illustrates an embodiment of the vertebral spacer according to the present invention wherein a section dissected from a femur bone is contained within a partial metallic sheath.
- FIG. 2B illustrates an embodiment of the vertebral spacer according to the present invention wherein a section dissected from a femur bone is contained within a partial metallic sheath and having angular protuberances on the metallic sheath.
- FIG. 3 illustrates another embodiment of the vertebral spacer according to the present invention having two slots extending from the upper surface thereof.
- FIG. 4 is an end elevation of the embodiment of the vertebral spacer shown in FIG. 3 .
- FIG. 5 is a side elevation of the embodiment of the vertebral spacer shown in FIG. 3 .
- FIG. 6 is a horizontal elevation showing the bottom surface of the embodiment of the vertebral spacer shown in FIG. 3 . Positions of the slots relative to the second guiding groove are indicated by dashed lines.
- FIG. 7 illustrates another embodiment of the vertebral spacer according to the present invention wherein slots extending from the upper surface thereof accommodate bone material therein.
- FIG. 8 illustrates another embodiment of the vertebral spacer comprising alternate layers of bone, a biocompatible material, and a linking pin.
- FIG. 9 illustrates another embodiment of a layered vertebral spacer according to the present invention wherein the outermost layers are bone.
- FIGS. 10-12 illustrate the sectioning of a femur to give at least one vertebral spacer according to the present invention.
- FIG. 10 shows the sectioning planes for the excision of a section of a femur.
- FIG. 11 shows a cross-sectional view of an excised section of a femur with minimal portions of the femur shown in cross-hatch trimmed away to give two vertebral spacers.
- FIG. 12 shows the cross-sectional view of two vertebral spacers cut from a femoral section.
- FIG. 13 shows an end elevation of a vertebral spacer according to the present invention excised from a femur and having two guiding grooves therein.
- FIG. 14 shows a side elevation of a vertebral spacer according to the present invention excised from a femur.
- FIGS. 15 and 16 illustrate an embodiment of the vertebral spacer of the present invention excised from a femur wherein the femur medullary cavity not bisected.
- FIG. 17 is a perspective view of a vertebral spacer according to the present invention excised from a femur.
- FIG. 18 is an end elevation of the vertebral spacer illustrated in FIG. 17 .
- FIG. 19 is a perspective view of another vertebral spacer according to the present invention cut from the same section of femur as the spacer in FIG. 17 .
- FIG. 20 shows a top elevation of a vertebral spacer according to the present invention cut from a femur section.
- FIG. 21 shows a bottom elevation of a vertebral spacer according to the present invention cut from a femur section.
- FIG. 22 illustrates a perspective view of a vertebral spacer according to the present invention cut from a femur section and having a plurality of bores therein.
- FIGS. 23-28 illustrate perspective cross-sectional views of embodiments of the insertion tool according to the present invention.
- FIG. 23 shows an embodiment of the insertion tool having a flange thereon.
- FIG. 24 shows an embodiment of the insertion tool having two flanges.
- FIG. 25 shows an embodiment of the insertion tool having a rib thereon.
- FIG. 26 shows an embodiment of the insertion tool having two ribs.
- FIG. 27 shows an embodiment of the insertion tool having a plurality of longitudinal ribs.
- FIG. 28 shows an embodiment of the insertion tool having protrusions.
- FIG. 29 illustrates a perspective view of the system for delivering a vertebral spacer to a patient according to the present invention wherein the vertebral spacer engages two flanges on the insertion tool.
- FIG. 30 illustrates a perspective view of the system for delivering a vertebral spacer to a patient according to the present invention wherein the vertebral spacer engages two ribs on the insertion tool.
- FIG. 31 illustrates a perspective view of an embodiment of the system for delivering a vertebral spacer to a patient wherein the insertion tool has two flanges.
- FIG. 32 illustrates a perspective view of an embodiment of the system for delivering a vertebral spacer to a patient wherein the insertion tool has two ribs.
- FIGS. 33-35 illustrate the assembly of an embodiment of the system for delivering a vertebral spacer to a patient.
- FIG. 33 shows a vertebral spacer engaging an insertion tool according to the present invention.
- FIG. 34 illustrates the system wherein the distal end of a pusher is configured to accept the vertebral spacer.
- FIG. 35 illustrates the direction of delivery of the vertebral spacer to an intervertebral space by the insertion tool and the pusher therein.
- FIG. 36 illustrates a vertical cross-sectional view of an embodiment of the system for delivery of a vertebral spacer to a patient according to the present invention.
- FIG. 37 illustrates a vertical cross-sectional view of another embodiment of the system for delivery of a vertebral spacer to a patient according to the present invention.
- FIG. 38 illustrates the cutting of a vertebral spacer receiving slot by an embodiment of the cutting tool according to the present invention.
- FIG. 39 is a side-elevation of an embodiment of the cutting tool and insertion tool according to the present invention.
- FIG. 40 illustrates an end-elevation of an embodiment of the cutting tool according to the present invention.
- FIG. 41 is a perspective view of an embodiment of the cutting tool and the insertion tool according to the present invention.
- FIGS. 42-45 illustrate the delivery of a vertebral spacer to an intervertebral space according to the methods of the present invention.
- FIG. 42 illustrates the placing of an insertion tool into an intervertebral space by using a guiding tool.
- FIG. 43 shows the rotation of the insertion tool within the intervertebral space after extraction of the guiding tool.
- FIG. 44 illustrates the formation of a vertebral spacer receiving slot by the cutting tool.
- FIG. 45 illustrates the delivery of the vertebral spacer into the intervertebral space and the vertebral spacer receiving slot.
- FIG. 46 is a perspective view showing an embodiment of the vertebral spacer according to the present invention in situ in an intervertebral space of a patient.
- FIG. 47 is an overhead view showing two vertebral spacers formed from a femur on a vertebral surface.
- One aspect of the present invention is a vertebral spacer for insertion between two adjacent vertebrae 20 , thereby maintaining the intervertebral space 23 and preventing compression of the spinal cord therein.
- Various embodiments of the vertebral spacer 10 in accordance with the present invention are shown in FIGS. 1A-22 .
- the vertebral spacer 10 of the present invention is useful to replace an intervertebral disc 21 that has degenerated due to traumatic injury, vertebral displacement, or disease, such as, for example, autoimmune disease or rheumatoid arthritis or any other pathological condition of the spinal column that may injure or shift the intervertebral disc.
- the vertebral spacer 10 of the present invention provides support to the vertebrae 20 and maintains separation between vertebrae while also preserving the natural curvature of the spine.
- the vertebral spacer 10 of the present invention may have a plurality of surfaces, including a lower surface 15 and an upper surface 16 , with the lower surface 15 having an anterior face 13 and a posterior face 14 extending therefrom, as shown in FIG. 1A .
- the anterior face 13 may be directed towards the inner body cavity of a patient, and the posterior face 14 may be directed towards the dorsal surface of the patient.
- the vertebral spacer 10 can be configured such that the height of the anterior face 13 is less than the height of the posterior face 14 , as is illustrated, for example, in FIG. 1A .
- the vertebral spacer 10 of the present invention further comprises a first guiding groove 17 in the upper surface 16 or the lower surface 15 of the vertebral spacer 10 .
- the vertebral spacer 10 may also have an optional second guiding groove 18 in the upper surface 16 or the lower surface 15 not having the first guiding groove 17 therein.
- the vertebral spacer 10 of the present invention may be of any biocompatible or physiologically inert material or combination of such materials having the mechanical strength capable of maintaining the intervertebral space 23 ( FIG. 46 ) between two adjacent vertebrae 20 .
- examples of such materials include bone, such as bone sections from the femur, titanium, titanium alloy, stainless steel, chrome cobalt, and polymeric materials such as methyl methacrylate (MMA), urethane, polyacetal and the like.
- the material of the vertebral spacer 10 may, however, also have a degree of resilience and thereby tolerate a degree of compression.
- Such materials may include, but are not limited to, polymers such as carbon fiber reinforced polymer such as PEEK (polyetherether ketone), polycarbonate, polypropylene, polyethylene, polyamide and silicone-based polymers.
- the vertebral spacer 10 of the present invention may comprise a bone core 12 such as a femur and a sheath 35 as shown in FIG. 2 .
- the sheath 35 is metallic, such as a tungsten sheath. In another embodiment the sheath comprises a biocompatible polymer. In one embodiment, shown in FIG. 2B , the metallic sheath 35 has angular protrusions 34 thereon.
- the vertebral spacer 10 of the present invention may have any conformation that will allow the spacer 10 to be positioned in an intervertebral space 23 between adjacent vertebrae 20 and which will maintain an intervertebral space 23 and the natural curvature of a spinal column when in the desired position.
- exemplary geometric cross-sections that may be applied to the vertebral spacer 10 of the present invention include, but are not limited to, a rectangular cross-section or a trapezoidal cross-section.
- the upper surface 16 , and optionally the lower surface, of the vertebral spacer 10 can also include at least one protrusion 34 for frictionally engaging a vertebrae 20 as disclosed in U.S. patent application Ser. No. ______ incorporated herein by reference in its entirety.
- An exemplary embodiment of the protrusions 34 of the present invention traversing the upper surface 16 of the vertebral spacer 10 are illustrated in FIG. 1B .
- the protrusions are located on a metallic sheath 35 encapsulating a bone core 12 .
- the protrusions 34 may have any suitable geometric configuration that will allow the vertebral spacer 10 of the present invention to be secured to adjacent vertebrae, including having a triangular, rounded, or rectangular cross-section and the like, or any combination thereof.
- the protrusions may be elongated as shown in FIG. 1B , or any other shape such as square or circular protrusions or irregular non-elongated protrusions.
- the hardening biocompatible composition may be delivered to the portion of the femur medullary cavity 19 .
- the hardening biocompatible composition may be delivered to the slots 11 thereof.
- One embodiment of the method of the present invention therefore, further comprises the step of delivering a hardening biocompatible composition to the vertebral spacer 10 .
- the hardening biocompatible composition may be used, for example, to bond the vertebral spacer 10 to an adjacent vertebra or be an osteogenic composition to promote bone growth from the adjacent vertebrae into the vertebral spacer 10 .
- the hardening biocompatible composition may be, for example, an organic polymer, a mineral composition such as a hydroxyapatite-based compositions, methyl methacrylate or a combination thereof.
- a hydroxyapatite-based composition is especially useful in the context of the present invention for promoting osteocyte growth and bone deposition.
- the direction of insertion of the vertebral spacer 10 by the methods of the present invention can be selected by the surgeon according to the needs of the patient.
- the anterior face 13 of the vertebral spacer 10 may be positioned relative to the spine to maintain a desired curvature thereof, as shown in FIG. 46 .
- the vertebral spacer 10 may be inserted posteriorly as shown, for example in FIG. 46 , anteriorly, or laterally, relative to the spinal column. Once inserted into a desired position in the intervertebral space 23 , as shown in FIG. 46 , the lower surface 15 and the upper surface 16 of the vertebral spacer 10 are substantially contacting the adjacent vertebrae 20 .
- the lower surface 15 of the vertebral spacer 10 may contact the lower vertebra 20
- the upper surface 16 may support the adjacent upper vertebra 20 .
- Optional protrusions 34 extending from the upper surface 16 as shown, for example, in FIG. 1B , and/or the lower surface 15 can increase the frictional resistance between the vertebral spacer 10 and the adjacent vertebrae 20 .
- the vertebral spacer 10 of the present invention can support adjacent vertebrae 20 after the partial or total surgical removal of an intervertebral disc 21 , thereby preventing collapse and/or compression of the spine in this region that might otherwise lead to severe neurological damage.
- At least one slot 11 may be formed in the upper surface 16 and extend towards, but not connecting with, the opposing lower surface 15 , as shown in FIGS. 3-6 .
- the at least one slot 11 may be formed in the lower surface 15 and extend towards the upper surface 16 .
- the at least one slot 11 has a bone core 12 disposed therein, as shown in FIG. 7 .
- a hardening biocompatible composition may be deposited in the at least one slot 11 , wherein the hardening biocompatible composition generally comprises an osteogenic compound such as, for example, hydroxyapatite.
- the spacer 10 comprises a plurality of layers, wherein at least one layer is a bone core 12 .
- the plurality of layers may be bonded by any suitable method such as an adhesive, screws, bolts, a linking pin, or the like, and which will hold the layers immobile relative to each other.
- the vertebral spacer 10 of the present invention as shown in FIG. 9 , may be bonded by at least one pin 9 .
- the plurality of layers may be bonded by two pins positioned to prevent movement of the layers relative to each other.
- the bonding method will not impede installation of the vertebral spacer 10 into the intervertebral space 23 ( FIG. 46 ) of a patient.
- the alternate layers may have bone cores 12 as inner layers as shown in FIGS. 7 and 8 , or as the outermost layers of the vertebral spacer 10 , as shown in FIG. 9 .
- the vertebral spacer 10 is formed from a femoral section 24 taken from the shaft 22 of a femur, as shown in FIG. 10 .
- the femoral section 24 having a central femur medullary cavity 19 therein, may be trimmed as shown in FIGS. 11 , 12 , 15 and 16 to yield at least one vertebral spacer 10 .
- Each vertebral spacer 10 obtained from a femur shaft 22 will have at least a portion of the femur medullary cavity 19 connecting the upper 16 and lower 15 surfaces of the vertebral spacer 10 .
- the indented portion of the femur medullary cavity 19 is useful to partially surround a spinal cord when the vertebral spacer 10 is positioned within an intervertebral space, thereby allowing the vertebral spacer 10 to be positioned closer to the spinal cord than would be possible if the cavity 19 were not present.
- the vertebral spacer 10 of the present invention when excised from a femur shaft 22 ( FIG. 10 ) also has a first guiding groove 17 , and optionally, a second guiding groove 18 , in the upper 16 and/or lower 15 surfaces respectively of the vertebral spacer 10 , as shown in FIGS. 11-22 .
- the vertebral spacer 10 of the present invention may further include a bore 46 , or a plurality of bores 46 , extending from the upper surface 16 and/or the lower surface 15 of the vertebral spacer 10 .
- Bony or other tissue growth from adjacent vertebrae that extends into the bore 46 , or plurality of bores 46 , of the vertebral spacer 10 of the present invention may bond the vertebrae and the vertebral spacer 10 .
- the bony growth will, therefore, effectively fuse the adjacent vertebrae.
- a tissue growth factor or an osteogenic material may be inserted into the bores to increase the bony growth and, therefore, the rate of this fusion.
- Suitable growth factors include, but are not limited to, growth hormones, steroids, tissue growth factors and the like.
- FIGS. 24-41 Another aspect of the present invention is a system for delivering a vertebral spacer 10 to the spinal column of a patient, generally illustrated in FIGS. 24-41 .
- the system for delivering the vertebral spacer comprises (a) an insertion tool 60 for delivering the vertebral spacer 10 to the spinal column of a patient, wherein the insertion tool 60 has a channel 61 and an inner surface 62 as shown in FIGS. 24-28 ; (b) an optional guiding tool 80 ; (c) a pusher 63 (as in FIGS.
- a distal end 65 slideably disposable in the channel 61 of the insertion tool 60 ;
- a vertebral spacer 10 slideably disposable in the channel 61 of the insertion tool 60 ;
- a cutting tool 70 FIGS. 38-41 ) having a shaft 72 with a distal end 74 and a proximal end 75 , and a cutting head 71 secured to the distal end 74 of the shaft 72 .
- the channel 61 of the insertion tool 60 of the system of the present invention generally is configured to slideably accept any of the various vertebral spacers 10 , according to the present invention, a pusher 63 and/or a cutting tool 70 .
- the insertion tool 60 further comprises at least one spacer guide 66 for slideably engaging with a first guiding groove 17 or a second guiding groove 18 of a vertebral spacer 10 .
- the spacer guide 66 is a flange extending along an outside edge of the channel 61 .
- the spacer guide 66 is two opposing flanges along the upper and lower outside or distal side edges of the insertion tool 10 configured to slideably engage with a first guiding groove 17 ( FIGS. 1 , 3 - 9 , 11 - 14 ) and a second guiding groove 18 of a vertebral spacer 10 .
- the spacer guide 66 is formed as one or more ribs longitudinally disposed on an inner surface 62 of the channel 61 .
- the spacer guide 66 may be formed by at least one segmented longitudinal rib disposed on the inner surface 62 of the channel 61 , as shown in FIG. 27 , or a linear series of spaced protrusions, also disposed on the inner surface 62 of the channel 61 , as shown in FIG. 28 . It is to be understood, however, that any configuration of spacer guides 66 may be used by the insertion tool 60 that will allow a vertebral spacer to be slideably engaged with the insertion tool 60 and not resist insertion of the vertebral spacer into the spinal column of a patient.
- the spacer guide 66 may slideably engage the first 17 and optional second 18 guiding groove with at least a portion of the vertebral spacer 10 positioned externally to the channel 61 , as illustrated in FIGS. 29 and 31 .
- the present invention also provides an optional guide tool 80 that can be slideably disposed in the channel 61 of the insertion tool 60 .
- the elongated optional guide tool can be inserted into an intervertebral space 23 as indicated in FIGS. 42-43 , to a position selected by a surgeon for guiding the insertion tool 60 to the same selected position.
- the system for delivery of a vertebral spacer 10 to the spinal column of a patient further comprises a pusher 63 having a distal end 65 for contacting a vertebral spacer 10 disposed in the channel 61 .
- the pusher 63 can be slideably engaged in the channel 61 of the insertion tool 60 and is suitable for enabling a surgeon to push a vertebral spacer 10 along the channel 61 , out of the insertion tool 60 and into an intervertebral space 23 .
- the distal end 65 may be substantially parallel to the posterior face 14 of the vertebral spacer 10 .
- This orientation is especially useful for inserting a vertebral spacer 10 of the present invention in the lumbar region of a spinal column. It is to be understood, however, that the vertebral spacer 10 may be inserted in the insertion tool 60 in the opposite orientation for insertion in another region of the spine where reverse curvature to that of the lumbar region is to be maintained.
- the configuration of the distal end 65 of the pusher 63 may be defined by the anterior face 13 and the upper surface 16 of the vertebral spacer 10 .
- the system for the delivery of a vertebral spacer 10 to the spinal column of a patient further provides a cutting tool 70 suitable for cutting a vertebral spacer receiving slot 78 into a vertebra 20 .
- the cutting tool 70 of the present invention has a shaft 72 with a distal end 74 and a proximal end 75 .
- a cutting head 71 is connected to the distal end 74 of the shaft 72 of the cutting tool 70 .
- a striking head 73 is disposed on the proximal end 75 of the shaft 72 .
- the cutting head 71 of the cutting tool 70 may be an integral configuration of the distal end 74 of the shaft 72 , or connected to the distal end 74 of the shaft 72 .
- the cutting head 71 is connected to the shaft by an attachment member 76 which may be, for example, a threaded attachment member 76 , as shown in FIGS. 39 and 40 .
- the cutting head 71 will be capable of being slideably disposed within the channel 61 of the insertion tool 60 providing that the pusher 63 and the vertebral spacer 10 are not disposed therein
- FIGS. 42-45 Another aspect of the present invention is a method for delivering a vertebral spacer 10 to a patient using the system of the present invention comprising the insertion tool 60 , an optional guide tool 80 , the vertebral spacer 10 , the pusher 63 and the cutting tool 70 .
- Such a method is generally illustrated in FIGS. 42-45 and comprises the steps of inserting the insertion tool 60 into an intervertebral space 23 of the spinal column of a patient ( FIG. 42 ), rotating the insertion tool 60 in the intervertebral space 23 ( FIG. 43 ), cutting a vertebral spacer receiving slot 78 ( FIG.
- the vertebral spacer 10 is pushed into the intervertebral space 23 by slideably disposing a pusher 63 into the channel 61 of the insertion tool 60 , and advancing the pusher 63 ( FIG. 45 ). The pusher 63 and the insertion tool 60 are then removed from the patient.
- the insertion tool 60 further optionally may be directed into the selected position within the intervertebral space 23 by the guide tool 80 that may be inserted by the surgeon into the intervertebral space 23 .
- the method of the present invention therefore, further comprises the optional step of inserting a guiding tool 80 into an intervertebral space 23 .
- the insertion tool 60 may then be slid along the guide tool 80 until the insertion tool 60 is at the selected position for insertion of a vertebral spacer 10 in the intervertebral space 23 .
- the guide tool 80 is then removed from the channel 61 of the insertion tool 60 , as shown in FIG. 42 , leaving the insertion tool 60 inserted between adjacent vertebrae 20 .
- the guide tool 80 may remain in the insertion tool 60 while the insertion tool 60 is rotated in the intervertebral space 23 , thereby providing torsional strength to the insertion tool 60 .
- the insertion tool 60 may be inserted into the intervertebral space 23 with the channel 61 facing a vertebra 20 , as shown in FIG. 42 .
- the insertion tool 60 may then be rotated so that the open channel 61 of the tool 60 is not facing a vertebra 20 , as shown in FIG. 43 .
- the cutting tool 70 is optionally slid along the channel 61 of the insertion tool 60 to engage a vertebra 20 and to chisel a vertebral space receiving slot 78 in the vertebrae 20 .
- two vertebral spacer receiving slots 78 may be cut in opposing faces of adjacent vertebrae 20 .
- the striking head 73 of the cutting tool 70 may be struck with a striking tool 77 to increase the cutting action of the cutting head 71 .
- the cutting tool 70 is removed from the patient by slideably withdrawing the cutting tool 70 back through the channel 61 of the insertion tool 60 .
- a vertebral spacer 10 may then be slideably engaged with the insertion tool 60 , wherein at least one space guide 66 on the insertion tool 60 engages with a first guiding groove 17 and optionally a second guiding groove 18 of the vertebral spacer 10 .
- the pusher 63 may then be slideably engaged with the channel 61 and contacted with the vertebral spacer 10 .
- the pusher 63 is advanced along the channel 61 of the insertion tool 60 thereby pushing the vertebral spacer 10 into the vertebral spacer receiving slot 78 or receiving slots 78 in the adjacent vertebrae 20 . It is also contemplated, however, that a vertebral spacer receiving slot 80 may not be cut in the adjacent vertebrae 20 and that the inserted vertebral spacer 10 may optionally contact the uncut surface of the vertebrae 20 .
- the methods of the present invention for the delivery of a vertebral spacer 10 to an intervertebral space 23 may also be used to deliver two vertebral spacers 10 , as shown in FIG. 47 , it is further understood that a hardening biocompatible composition may be delivered between the vertebral spacers, thereby forming a larger effective spacer and optionally promoting bone growth to secure the vertebral spacers 10 to the vertebrae.
- kits for delivering a vertebral spacer to the spinal column of a patient comprising an insertion tool for delivering a vertebral spacer to the spinal column of a patient and having a channel having an inner surface, a pusher having a distal end is slideably disposable in the channel of the insertion tool, a vertebral spacer slideably disposable in the channel of the insertion tool, a cutting tool having a shaft with a distal end and a proximal end, and a cutting head secured to the distal end of the shaft, wherein the cutting tool is slideably disposable in the insertion tool providing that the pusher and the vertebral spacer are not disposed therein.
- Instructions for the use of the system and its various components to deliver a vertebral spacer to the spinal column of a patient also generally are included or provided.
- the kit of the present invention further can include an optional guiding tool configured to slideably engage the channel of the insertion device, and instructions for the operation thereof.
Abstract
The present invention provides vertebral spacers having a lower surface and an upper surface, an anterior face and a posterior face extending from the lower surface, and at least one guiding groove for engaging an insertion tool. A system for delivering a vertebral spacer to the spinal column of a patient, includes an insertion tool, an optional guiding tool, a pusher, a vertebral spacer, and a cutting tool. The insertion tool accepts any of a pusher, a vertebral spacer, or a cutting tool and has at least one spacer guide for engaging with a guiding groove of a vertebral spacer. The vertebral spacer is inserted into a patient by inserting the insertion tool into an intervertebral space, engaging the guiding groove of a vertebral spacer with a space guide of the insertion tool, advancing a pusher into the insertion tool, thereby pushing the vertebral spacer into the intervertebral space and thereafter removing the pusher and the insertion tool. The cutting tool is optionally used to chisel at least one vertebral space receiving slot in the vertebrae. A hardening biocompatible composition also maybe delivered, to bond the vertebral spacer to an adjacent vertebra or be an osteogenic composition to promote bone growth.
Description
- This application is a continuation of U.S. patent application Ser. No. 10/923,499, filed on Aug. 20, 2004; which application is a continuation of U.S. patent application Ser. No. 09/947,851, filed on Sep. 6, 2001, now U.S. Pat. No. 6,824,565; which application claims the benefit of U.S. Provisional Patent Application No. 60/231,142, filed on Sep. 8, 2000.
- The specifications of 10/923,499, filed Aug. 20, 2004; 09/947,851, filed Sep. 6, 2001; and 60/231,142, filed Sep. 8, 2000, are incorporated herein in their entirety, by this reference.
- 1. Field of Invention
- The present invention generally relates to a vertebral spacer to be inserted into an intervertebral space, thereby supporting the spinal column of a patient. The present invention further relates to a system and methods for implanting the vertebral spacer into the spinal column and securing the spacer therein.
- 2. Background of the Invention
- The spinal column, which is the central support to the vertebrate skeleton and a protective enclosure for the spinal cord, is a linear series of vertebral bones. Intervertebral discs separate and reduce friction between adjacent vertebrae and absorb compression forces applied to the spinal column. Spinal nerves that extend from each side of the spinal cord exit the column at intervertebral forama.
- A typical vertebra comprises an anterior body, and a posterior arch that surrounds the spinal cord lying within the vertebral foramen formed by the arch. The muscles that flex the spine are attached to three processes extending from the posterior arch. On the upper surface of each vertebra in a standing human, are two superior articulated processes that oppose two inferior articulated processes extending from the lower surface of an adjacent vertebra. Facets on the opposing processes determine the range and direction of movement between adjacent vertebrae, hence the flexibility of the spinal column.
- The intervertebral discs include the fibrillar cartilage of the anulus fibrosus, a fibrous ring, the center of which is filled with an elastic fibrogelatinous pulp that acts as a shock absorber. The outer third of the anulus fibrosus is innervated. The entire spinal column is united and strengthened by encapsulating ligaments.
- Back pain is one of the most significant problems facing the workforce in the United States today. It is a leading cause of sickness-related absenteeism and is the main cause of disability for people aged between 19 and 45. Published reports suggest that the economic cost is significant, treatment alone exceeding $80 billion annually. Although acute back pain is common and typically treated with analgesics, chronic pain may demand surgery for effective treatment.
- Back pain can occur from pinching or irritation of spinal nerves, compression of the spine, vertebral shifting relative to the spinal cord axis, and bone spur formation. The most common cause of disabling back pain, however, stems from trauma to a intervertebral disc, resulting from mechanical shock, stress, tumors or degenerative disease, which may impair functioning of the disc and limit spinal mobility. In many cases, the disc is permanently damaged and the preferred treatment becomes partial or total excision.
- Another cause of back injury is herniation of the intervertebral disc, wherein the gelatinous fluid of the nucleus pulposus enters the vertebral canal and pressures the spinal cord. Again, surgery is often the only method available for permanent relief from pain or the neurological damage ensuing from the pressure of fluid on the spinal cord, and requires replacement of the damaged disc.
- Traumatic injury to an intervertebral disc that is not removed will frequently promote scar tissue formation. Scar tissue is weaker than original healthy tissue so that the disc will progressively degenerate, lose water content, stiffen and become less effective as a shock absorber. Eventually, the disc may deform, herniate, or collapse, limiting flexibility of the spinal column at that position. The only option is for the intervertebral disc to be partially or totally removed.
- When the disc is partially or completely removed, it is necessary to replace the excised material to prevent direct contact between hard bony surfaces of adjacent vertebrae. One vertebral spacer that may be inserted between adjacent vertebrae, according to U.S. Pat. No. 5,989,291 to Ralph et al., includes two opposing plates separated by a belleville washer or a modified belleville washer. The washer functions to provide a restorative force to mimic the natural functions of the disc of providing a shock absorber and mobility between adjacent vertebrae. However, mechanical devices intended to replicate intervertebral disc function have had only limited success. An alternative approach is a “cage” that maintains the space usually occupied by the disc to prevent the vertebrae from collapsing and impinging the nerve roots.
- Spinal fusion may be used to restrict motion occurring between two vertebrae due to spinal segmental instability. Fusing the vertebrae together, however, reduces the mechanical back pain by preventing the now immobile vertebrae from impinging on the spinal nerve. The disadvantage of such spacers is that stability is created at the expense of spinal flexibility.
- Surgical procedures for replacing intervertebral disc material, rather than the fusing of the vertebrae, have included anterior approaches and posterior approaches to the spinal column. The posterior approach (from the back of the patient) encounters the spinous process, superior articular process, and the inferior articular process that must be removed before insertion of the disc replacement material into the intervertebral space. Excessive removal of the bony process triggers further degradation and impediment of the normal movement of the spine. The anterior approach to the spinal column is complicated by the internal organs that must be bypassed or circumvented to access the vertebrae.
- Many intervertebral spacers require preparation of the surfaces of the adjacent vertebrae to accommodate the spacer, causing significant tissue and bone trauma. For example, chiseling or drilling of the vertebral surface may be required to prepare a receiving slot. They may also require screwing the spacer into the intervertebral space, making installation difficult and increasing trauma to the vertebral tissue. Many spacers include complex geometries and are costly to manufacture. Examples of such geometrically complex spacers are described in U.S. Pat. No. 5,609,636 to Kohrs et al., U.S. Pat. No. 5,780,919 to Zdeblick et al., U.S. Pat. No. 5,865,848 to Baker and U.S. Pat. No. 5,776,196 to Matsuzaki et al. Many of these complex spacers may require screwing the spacer into the intervertebral space, thereby making installation difficult and traumatic to the vertebral tissue.
- There is a need for a vertebral spacer having a simple geometry that is easily insertable into an intervertebral space while causing minimal trauma to the surface of the vertebrae as well as the bony processes thereof. The present invention provides a vertebral spacer having a simple geometry for supporting adjacent vertebrae after excision, at least partially or wholly, of an intervertebral disc. The spacer includes a body having a lower surface and an upper surface. The lower surface will be supported by a lower vertebra; the upper surface supports the adjacent upper vertebra. The body of the vertebral spacer of the present invention, therefore, provides support between the two adjacent vertebrae and to the spinal column.
- The body of the vertebral spacer of the present invention additionally has an anterior face and a posterior face extending from the lower surface. The height of the anterior face of the body may be less than, or greater than, the height of the posterior face to maintain the curvature of the spine when the vertebral spacer is inserted between two vertebrae. The body of the vertebral spacer also includes at least one guiding groove suitable for engaging with an insertion tool for delivering the vertebral spacer to an intervertebral space.
- The present invention further provides a system for delivering a vertebral spacer to the spinal column of a patient, comprising an insertion tool with a channel; (b) an optional guiding tool for directing the insertion tool to a selected point of insertion of a vertebral spacer; (c) a pusher; (d) a vertebral spacer slideably disposed in the channel of the insertion tool; and (e) a cutting tool. The cutting tool can be slid into the channel of the insertion tool providing that the pusher and the vertebral spacer are not therein.
- The channel of the insertion tool is configured to slideably accept any of a vertebral spacer, a pusher, a vertebral spacer , or a cutting tool. The insertion tool further comprises a spacer guide or a plurality of spacer guides for engagement with a first guiding groove or a second guiding groove of a vertebral spacer.
- In one embodiment of the insertion tool the spacer guide is a flange extending from the channel. In another embodiment, the spacer guide is two opposing flanges configured to slideably engage with a first guiding groove and a second guiding groove, respectively.
- In another embodiment of the insertion tool, the spacer guide is at least one rib longitudinally placed on the inner surface of the channel of the insertion tool.
- Other embodiments of the insertion tool of the present invention include spacer guides that may be, but are not limited to, a segmented longitudinal rib, or a linear series of protrusions, also on the inner surface of the channel.
- The present invention further provides a method for delivering a vertebral spacer to a patient, comprising the steps of inserting the insertion tool into an intervertebral space of the spinal column of a patient, engaging at least one guiding groove of a vertebral spacer with a space guide of the insertion tool, sliding a pusher into the channel of the insertion tool, advancing the pusher and thereby pushing the vertebral spacer into the intervertebral space and removing the pusher and the insertion tool from the patient.
- The method of the present invention may further comprise the optional step of inserting a guiding tool into an intervertebral space for directing the insertion tool into the intervertebral space. The insertion tool may be slid along the guide tool to a selected position suitable for insertion of a vertebral spacer in the intervertebral space. The guide tool is then extracted from the insertion tool leaving the insertion tool inserted between adjacent vertebrae.
- The cutting tool is optionally slid along the channel of the insertion tool to engage a vertebra and generally is used to chisel at least one vertebral space receiving slot in the vertebrae. The cutting tool is removed from the patient by sliding the cutting tool back through the channel of the insertion tool. A vertebral spacer may then be slideably engaged with the insertion tool, with a space guide on the insertion tool engaging with a guiding groove of the vertebral spacer. The pusher may be engaged and advanced along the channel, thereby delivering the vertebral spacer into the vertebral spacer receiving slot (or receiving slots) in the adjacent vertebrae. It is also contemplated that a vertebral spacer receiving slot may not be cut in the adjacent vertebrae and that the inserted vertebral spacer optionally may contact only the uncut surface of the vertebrae.
- One embodiment of the method of the present invention comprises the additional step of delivering a hardening biocompatible composition to the vertebral spacer. The hardening biocompatible composition may be used, for example, to bond the vertebral spacer to an adjacent vertebra or be an osteogenic composition to promote bone growth from the adjacent vertebrae into the vertebral spacer. The hardening biocompatible composition can be, for example, an organic polymer, a mineral composition such as a hydroxyapatite-based composition, methyl methacrylate, or the like, or a combination thereof. A hydroxyapatite-based composition is especially useful in the context of the present invention for promoting osteocyte growth and bone deposition.
- Various objects, features, and advantages of the invention will become more apparent upon review of the detailed description set forth below when taken in conjunction with the accompanying drawing figures, which are briefly described as follows.
-
FIG. 1A illustrates an embodiment of the vertebral spacer according to the present invention having a first guiding groove and a second guiding groove. -
FIG. 1B illustrates an embodiment of the vertebral spacer according to the present invention having protrusions on the upper surface thereof. -
FIG. 2A illustrates an embodiment of the vertebral spacer according to the present invention wherein a section dissected from a femur bone is contained within a partial metallic sheath. -
FIG. 2B illustrates an embodiment of the vertebral spacer according to the present invention wherein a section dissected from a femur bone is contained within a partial metallic sheath and having angular protuberances on the metallic sheath. -
FIG. 3 illustrates another embodiment of the vertebral spacer according to the present invention having two slots extending from the upper surface thereof. -
FIG. 4 is an end elevation of the embodiment of the vertebral spacer shown inFIG. 3 . -
FIG. 5 is a side elevation of the embodiment of the vertebral spacer shown inFIG. 3 . -
FIG. 6 is a horizontal elevation showing the bottom surface of the embodiment of the vertebral spacer shown inFIG. 3 . Positions of the slots relative to the second guiding groove are indicated by dashed lines. -
FIG. 7 illustrates another embodiment of the vertebral spacer according to the present invention wherein slots extending from the upper surface thereof accommodate bone material therein. -
FIG. 8 illustrates another embodiment of the vertebral spacer comprising alternate layers of bone, a biocompatible material, and a linking pin. -
FIG. 9 illustrates another embodiment of a layered vertebral spacer according to the present invention wherein the outermost layers are bone. -
FIGS. 10-12 illustrate the sectioning of a femur to give at least one vertebral spacer according to the present invention.FIG. 10 shows the sectioning planes for the excision of a section of a femur. -
FIG. 11 shows a cross-sectional view of an excised section of a femur with minimal portions of the femur shown in cross-hatch trimmed away to give two vertebral spacers.FIG. 12 shows the cross-sectional view of two vertebral spacers cut from a femoral section. -
FIG. 13 shows an end elevation of a vertebral spacer according to the present invention excised from a femur and having two guiding grooves therein. -
FIG. 14 shows a side elevation of a vertebral spacer according to the present invention excised from a femur. -
FIGS. 15 and 16 illustrate an embodiment of the vertebral spacer of the present invention excised from a femur wherein the femur medullary cavity not bisected. -
FIG. 17 is a perspective view of a vertebral spacer according to the present invention excised from a femur. -
FIG. 18 is an end elevation of the vertebral spacer illustrated inFIG. 17 . -
FIG. 19 is a perspective view of another vertebral spacer according to the present invention cut from the same section of femur as the spacer inFIG. 17 . -
FIG. 20 shows a top elevation of a vertebral spacer according to the present invention cut from a femur section. -
FIG. 21 shows a bottom elevation of a vertebral spacer according to the present invention cut from a femur section. -
FIG. 22 illustrates a perspective view of a vertebral spacer according to the present invention cut from a femur section and having a plurality of bores therein. -
FIGS. 23-28 illustrate perspective cross-sectional views of embodiments of the insertion tool according to the present invention.FIG. 23 shows an embodiment of the insertion tool having a flange thereon.FIG. 24 shows an embodiment of the insertion tool having two flanges.FIG. 25 shows an embodiment of the insertion tool having a rib thereon.FIG. 26 shows an embodiment of the insertion tool having two ribs.FIG. 27 shows an embodiment of the insertion tool having a plurality of longitudinal ribs.FIG. 28 shows an embodiment of the insertion tool having protrusions. -
FIG. 29 illustrates a perspective view of the system for delivering a vertebral spacer to a patient according to the present invention wherein the vertebral spacer engages two flanges on the insertion tool. -
FIG. 30 illustrates a perspective view of the system for delivering a vertebral spacer to a patient according to the present invention wherein the vertebral spacer engages two ribs on the insertion tool. -
FIG. 31 illustrates a perspective view of an embodiment of the system for delivering a vertebral spacer to a patient wherein the insertion tool has two flanges. -
FIG. 32 illustrates a perspective view of an embodiment of the system for delivering a vertebral spacer to a patient wherein the insertion tool has two ribs. -
FIGS. 33-35 illustrate the assembly of an embodiment of the system for delivering a vertebral spacer to a patient.FIG. 33 shows a vertebral spacer engaging an insertion tool according to the present invention.FIG. 34 illustrates the system wherein the distal end of a pusher is configured to accept the vertebral spacer.FIG. 35 illustrates the direction of delivery of the vertebral spacer to an intervertebral space by the insertion tool and the pusher therein. -
FIG. 36 illustrates a vertical cross-sectional view of an embodiment of the system for delivery of a vertebral spacer to a patient according to the present invention. -
FIG. 37 illustrates a vertical cross-sectional view of another embodiment of the system for delivery of a vertebral spacer to a patient according to the present invention. -
FIG. 38 illustrates the cutting of a vertebral spacer receiving slot by an embodiment of the cutting tool according to the present invention. -
FIG. 39 is a side-elevation of an embodiment of the cutting tool and insertion tool according to the present invention. -
FIG. 40 illustrates an end-elevation of an embodiment of the cutting tool according to the present invention. -
FIG. 41 is a perspective view of an embodiment of the cutting tool and the insertion tool according to the present invention. -
FIGS. 42-45 illustrate the delivery of a vertebral spacer to an intervertebral space according to the methods of the present invention.FIG. 42 illustrates the placing of an insertion tool into an intervertebral space by using a guiding tool.FIG. 43 shows the rotation of the insertion tool within the intervertebral space after extraction of the guiding tool.FIG. 44 illustrates the formation of a vertebral spacer receiving slot by the cutting tool.FIG. 45 illustrates the delivery of the vertebral spacer into the intervertebral space and the vertebral spacer receiving slot. -
FIG. 46 is a perspective view showing an embodiment of the vertebral spacer according to the present invention in situ in an intervertebral space of a patient. -
FIG. 47 is an overhead view showing two vertebral spacers formed from a femur on a vertebral surface. - A full and enabling disclosure of the present invention, including the best mode known to the inventor of carrying out the invention, is set forth more particularly in the remainder of the specification, including reference to the accompanying drawings, wherein like reference numerals designate corresponding parts throughout several figures. This description is made for the purpose of illustrating the general principles of the invention and should not be taken in the limiting sense.
- One aspect of the present invention is a vertebral spacer for insertion between two
adjacent vertebrae 20, thereby maintaining theintervertebral space 23 and preventing compression of the spinal cord therein. Various embodiments of thevertebral spacer 10 in accordance with the present invention are shown inFIGS. 1A-22 . Thevertebral spacer 10 of the present invention is useful to replace an intervertebral disc 21 that has degenerated due to traumatic injury, vertebral displacement, or disease, such as, for example, autoimmune disease or rheumatoid arthritis or any other pathological condition of the spinal column that may injure or shift the intervertebral disc. Thevertebral spacer 10 of the present invention provides support to thevertebrae 20 and maintains separation between vertebrae while also preserving the natural curvature of the spine. - The
vertebral spacer 10 of the present invention may have a plurality of surfaces, including alower surface 15 and anupper surface 16, with thelower surface 15 having ananterior face 13 and aposterior face 14 extending therefrom, as shown inFIG. 1A . Theanterior face 13 may be directed towards the inner body cavity of a patient, and theposterior face 14 may be directed towards the dorsal surface of the patient. Thevertebral spacer 10 can be configured such that the height of theanterior face 13 is less than the height of theposterior face 14, as is illustrated, for example, inFIG. 1A . The difference in the height of the opposinganterior 13 andposterior 14 faces of thevertebral spacer 10 of the present invention, so that thelower surface 15 and theupper surface 16 are non-parallel, is useful to preserve the natural curvature of the spinal column. Thevertebral spacer 10 of the present invention further comprises afirst guiding groove 17 in theupper surface 16 or thelower surface 15 of thevertebral spacer 10. Thevertebral spacer 10, as contemplated by the present invention, may also have an optionalsecond guiding groove 18 in theupper surface 16 or thelower surface 15 not having the first guidinggroove 17 therein. - It is contemplated that the
vertebral spacer 10 of the present invention may be of any biocompatible or physiologically inert material or combination of such materials having the mechanical strength capable of maintaining the intervertebral space 23 (FIG. 46 ) between twoadjacent vertebrae 20. Examples of such materials include bone, such as bone sections from the femur, titanium, titanium alloy, stainless steel, chrome cobalt, and polymeric materials such as methyl methacrylate (MMA), urethane, polyacetal and the like. The material of thevertebral spacer 10 may, however, also have a degree of resilience and thereby tolerate a degree of compression. Such materials may include, but are not limited to, polymers such as carbon fiber reinforced polymer such as PEEK (polyetherether ketone), polycarbonate, polypropylene, polyethylene, polyamide and silicone-based polymers. - It is further contemplated that the
vertebral spacer 10 of the present invention may comprise abone core 12 such as a femur and asheath 35 as shown inFIG. 2 . - In one embodiment, the
sheath 35 is metallic, such as a tungsten sheath. In another embodiment the sheath comprises a biocompatible polymer. In one embodiment, shown inFIG. 2B , themetallic sheath 35 hasangular protrusions 34 thereon. - The
vertebral spacer 10 of the present invention may have any conformation that will allow thespacer 10 to be positioned in anintervertebral space 23 betweenadjacent vertebrae 20 and which will maintain anintervertebral space 23 and the natural curvature of a spinal column when in the desired position. Referring toFIGS. 1A-22 , exemplary geometric cross-sections that may be applied to thevertebral spacer 10 of the present invention include, but are not limited to, a rectangular cross-section or a trapezoidal cross-section. - As shown in
FIGS. 1B and 2B , theupper surface 16, and optionally the lower surface, of thevertebral spacer 10 can also include at least oneprotrusion 34 for frictionally engaging avertebrae 20 as disclosed in U.S. patent application Ser. No. ______ incorporated herein by reference in its entirety. An exemplary embodiment of theprotrusions 34 of the present invention traversing theupper surface 16 of thevertebral spacer 10 are illustrated inFIG. 1B . In another embodiment of thevertebral spacer 10 of the present invention, as shown inFIG. 2B , the protrusions are located on ametallic sheath 35 encapsulating abone core 12. Theprotrusions 34 may have any suitable geometric configuration that will allow thevertebral spacer 10 of the present invention to be secured to adjacent vertebrae, including having a triangular, rounded, or rectangular cross-section and the like, or any combination thereof. The protrusions may be elongated as shown inFIG. 1B , or any other shape such as square or circular protrusions or irregular non-elongated protrusions. - When the
vertebral spacer 10 comprises a section of a femur and wherein the femurmedullary cavity 19 connects theanterior face 13 and theposterior face 14 of thevertebral spacer 10, as shown inFIG. 2 , the hardening biocompatible composition may be delivered to the portion of the femurmedullary cavity 19. With the alternative embodiments of thevertebral spacer 10 having at least oneslot 11 extending from theupper surface 16 orlower surface 15, the hardening biocompatible composition may be delivered to theslots 11 thereof. One embodiment of the method of the present invention, therefore, further comprises the step of delivering a hardening biocompatible composition to thevertebral spacer 10. The hardening biocompatible composition may be used, for example, to bond thevertebral spacer 10 to an adjacent vertebra or be an osteogenic composition to promote bone growth from the adjacent vertebrae into thevertebral spacer 10. The hardening biocompatible composition may be, for example, an organic polymer, a mineral composition such as a hydroxyapatite-based compositions, methyl methacrylate or a combination thereof. A hydroxyapatite-based composition is especially useful in the context of the present invention for promoting osteocyte growth and bone deposition. - The direction of insertion of the
vertebral spacer 10 by the methods of the present invention can be selected by the surgeon according to the needs of the patient. Theanterior face 13 of thevertebral spacer 10, for example, may be positioned relative to the spine to maintain a desired curvature thereof, as shown inFIG. 46 . Thevertebral spacer 10 may be inserted posteriorly as shown, for example inFIG. 46 , anteriorly, or laterally, relative to the spinal column. Once inserted into a desired position in theintervertebral space 23, as shown inFIG. 46 , thelower surface 15 and theupper surface 16 of thevertebral spacer 10 are substantially contacting theadjacent vertebrae 20. For example, thelower surface 15 of thevertebral spacer 10 may contact thelower vertebra 20, and theupper surface 16 may support the adjacentupper vertebra 20.Optional protrusions 34 extending from theupper surface 16 as shown, for example, inFIG. 1B , and/or thelower surface 15 can increase the frictional resistance between thevertebral spacer 10 and theadjacent vertebrae 20. As shown inFIG. 46 , thevertebral spacer 10 of the present invention can supportadjacent vertebrae 20 after the partial or total surgical removal of an intervertebral disc 21, thereby preventing collapse and/or compression of the spine in this region that might otherwise lead to severe neurological damage. - In another embodiment of the
vertebral spacer 10 of the present invention, at least oneslot 11 may be formed in theupper surface 16 and extend towards, but not connecting with, the opposinglower surface 15, as shown inFIGS. 3-6 . Alternatively, the at least oneslot 11 may be formed in thelower surface 15 and extend towards theupper surface 16. - In still another embodiment of the
vertebral spacer 10 of the present invention, the at least oneslot 11 has abone core 12 disposed therein, as shown inFIG. 7 . Alternatively, a hardening biocompatible composition may be deposited in the at least oneslot 11, wherein the hardening biocompatible composition generally comprises an osteogenic compound such as, for example, hydroxyapatite. - In another embodiment of the
vertebral spacer 10 of the present invention, shown inFIGS. 8 and 9 , thespacer 10 comprises a plurality of layers, wherein at least one layer is abone core 12. The plurality of layers may be bonded by any suitable method such as an adhesive, screws, bolts, a linking pin, or the like, and which will hold the layers immobile relative to each other. In one embodiment of thevertebral spacer 10 of the present invention, as shown inFIG. 9 , may be bonded by at least one pin 9. In another embodiment of thevertebral spacer 10, the plurality of layers may be bonded by two pins positioned to prevent movement of the layers relative to each other. The bonding method will not impede installation of thevertebral spacer 10 into the intervertebral space 23 (FIG. 46 ) of a patient. The alternate layers may havebone cores 12 as inner layers as shown inFIGS. 7 and 8 , or as the outermost layers of thevertebral spacer 10, as shown inFIG. 9 . - Referring now to
FIGS. 10-22 , in another embodiment of thevertebral spacer 10 of the present invention, thevertebral spacer 10 is formed from afemoral section 24 taken from theshaft 22 of a femur, as shown inFIG. 10 . Thefemoral section 24, having a central femurmedullary cavity 19 therein, may be trimmed as shown inFIGS. 11 , 12, 15 and 16 to yield at least onevertebral spacer 10. Eachvertebral spacer 10 obtained from afemur shaft 22 will have at least a portion of the femurmedullary cavity 19 connecting the upper 16 and lower 15 surfaces of thevertebral spacer 10. The indented portion of the femurmedullary cavity 19 is useful to partially surround a spinal cord when thevertebral spacer 10 is positioned within an intervertebral space, thereby allowing thevertebral spacer 10 to be positioned closer to the spinal cord than would be possible if thecavity 19 were not present. Thevertebral spacer 10 of the present invention, when excised from a femur shaft 22 (FIG. 10 ) also has afirst guiding groove 17, and optionally, asecond guiding groove 18, in the upper 16 and/or lower 15 surfaces respectively of thevertebral spacer 10, as shown inFIGS. 11-22 . - Referring now to
FIG. 22 , thevertebral spacer 10 of the present invention may further include abore 46, or a plurality ofbores 46, extending from theupper surface 16 and/or thelower surface 15 of thevertebral spacer 10. Bony or other tissue growth from adjacent vertebrae that extends into thebore 46, or plurality ofbores 46, of thevertebral spacer 10 of the present invention may bond the vertebrae and thevertebral spacer 10. The bony growth will, therefore, effectively fuse the adjacent vertebrae. It is further contemplated that a tissue growth factor or an osteogenic material may be inserted into the bores to increase the bony growth and, therefore, the rate of this fusion. Suitable growth factors include, but are not limited to, growth hormones, steroids, tissue growth factors and the like. - Another aspect of the present invention is a system for delivering a
vertebral spacer 10 to the spinal column of a patient, generally illustrated inFIGS. 24-41 . The system for delivering the vertebral spacer comprises (a) aninsertion tool 60 for delivering thevertebral spacer 10 to the spinal column of a patient, wherein theinsertion tool 60 has achannel 61 and aninner surface 62 as shown inFIGS. 24-28 ; (b) anoptional guiding tool 80; (c) a pusher 63 (as inFIGS. 31-37 ) having adistal end 65 slideably disposable in thechannel 61 of theinsertion tool 60; (d) avertebral spacer 10 slideably disposable in thechannel 61 of theinsertion tool 60; and (e) a cutting tool 70 (FIGS. 38-41 ) having ashaft 72 with adistal end 74 and aproximal end 75, and a cuttinghead 71 secured to thedistal end 74 of theshaft 72. - The
channel 61 of theinsertion tool 60 of the system of the present invention generally is configured to slideably accept any of the variousvertebral spacers 10, according to the present invention, apusher 63 and/or acutting tool 70. Theinsertion tool 60 further comprises at least onespacer guide 66 for slideably engaging with afirst guiding groove 17 or asecond guiding groove 18 of avertebral spacer 10. - Referring now to
FIGS. 23-28 , in one embodiment of theinsertion tool 60 of the present invention, as shown inFIG. 23 , thespacer guide 66 is a flange extending along an outside edge of thechannel 61. In another embodiment of theinsertion tool 60 of the present invention, as shown inFIG. 24 , thespacer guide 66 is two opposing flanges along the upper and lower outside or distal side edges of theinsertion tool 10 configured to slideably engage with a first guiding groove 17 (FIGS. 1 , 3-9, 11-14) and asecond guiding groove 18 of avertebral spacer 10. - In still another embodiment of the
insertion tool 60 of the present invention as shown inFIGS. 25 and 26 , thespacer guide 66 is formed as one or more ribs longitudinally disposed on aninner surface 62 of thechannel 61. - In other embodiments of the
insertion tool 60 of the present invention, thespacer guide 66 may be formed by at least one segmented longitudinal rib disposed on theinner surface 62 of thechannel 61, as shown inFIG. 27 , or a linear series of spaced protrusions, also disposed on theinner surface 62 of thechannel 61, as shown inFIG. 28 . It is to be understood, however, that any configuration of spacer guides 66 may be used by theinsertion tool 60 that will allow a vertebral spacer to be slideably engaged with theinsertion tool 60 and not resist insertion of the vertebral spacer into the spinal column of a patient. - As shown in
FIGS. 29-35 , thespacer guide 66, or a plurality ofguides 66, may slideably engage the first 17 and optional second 18 guiding groove with at least a portion of thevertebral spacer 10 positioned externally to thechannel 61, as illustrated inFIGS. 29 and 31 . - The present invention also provides an
optional guide tool 80 that can be slideably disposed in thechannel 61 of theinsertion tool 60. The elongated optional guide tool can be inserted into anintervertebral space 23 as indicated inFIGS. 42-43 , to a position selected by a surgeon for guiding theinsertion tool 60 to the same selected position. - As shown in
FIGS. 31-32 , 34-37, and 45, the system for delivery of avertebral spacer 10 to the spinal column of a patient further comprises apusher 63 having adistal end 65 for contacting avertebral spacer 10 disposed in thechannel 61. It is contemplated that thepusher 63 can be slideably engaged in thechannel 61 of theinsertion tool 60 and is suitable for enabling a surgeon to push avertebral spacer 10 along thechannel 61, out of theinsertion tool 60 and into anintervertebral space 23. - In one embodiment of the pusher of the present invention as illustrated in
FIGS. 31 and 32 , thedistal end 65 may be substantially parallel to theposterior face 14 of thevertebral spacer 10. This orientation is especially useful for inserting avertebral spacer 10 of the present invention in the lumbar region of a spinal column. It is to be understood, however, that thevertebral spacer 10 may be inserted in theinsertion tool 60 in the opposite orientation for insertion in another region of the spine where reverse curvature to that of the lumbar region is to be maintained. In other embodiments of the present invention such as shown, for example, inFIGS. 34 , 35 and 37, the configuration of thedistal end 65 of thepusher 63 may be defined by theanterior face 13 and theupper surface 16 of thevertebral spacer 10. - As illustrated in
FIGS. 38-41 , the system for the delivery of avertebral spacer 10 to the spinal column of a patient further provides acutting tool 70 suitable for cutting a vertebralspacer receiving slot 78 into avertebra 20. The cuttingtool 70 of the present invention has ashaft 72 with adistal end 74 and aproximal end 75. A cuttinghead 71 is connected to thedistal end 74 of theshaft 72 of thecutting tool 70. In one embodiment of thecutting tool 70 of the present invention, a strikinghead 73 is disposed on theproximal end 75 of theshaft 72. - The cutting
head 71 of thecutting tool 70 may be an integral configuration of thedistal end 74 of theshaft 72, or connected to thedistal end 74 of theshaft 72. In one embodiment of thecutting tool 70 of the present invention, the cuttinghead 71 is connected to the shaft by anattachment member 76 which may be, for example, a threadedattachment member 76, as shown inFIGS. 39 and 40 . The cuttinghead 71 will be capable of being slideably disposed within thechannel 61 of theinsertion tool 60 providing that thepusher 63 and thevertebral spacer 10 are not disposed therein - Another aspect of the present invention is a method for delivering a
vertebral spacer 10 to a patient using the system of the present invention comprising theinsertion tool 60, anoptional guide tool 80, thevertebral spacer 10, thepusher 63 and thecutting tool 70. Such a method is generally illustrated inFIGS. 42-45 and comprises the steps of inserting theinsertion tool 60 into anintervertebral space 23 of the spinal column of a patient (FIG. 42 ), rotating theinsertion tool 60 in the intervertebral space 23 (FIG. 43 ), cutting a vertebral spacer receiving slot 78 (FIG. 44 ), and engaging the first guidinggroove 17, and optionally asecond guiding groove 18, of avertebral spacer 10 with aspace guide 66 of theinsertion tool 60. Thevertebral spacer 10 is pushed into theintervertebral space 23 by slideably disposing apusher 63 into thechannel 61 of theinsertion tool 60, and advancing the pusher 63 (FIG. 45 ). Thepusher 63 and theinsertion tool 60 are then removed from the patient. - The
insertion tool 60 further optionally may be directed into the selected position within theintervertebral space 23 by theguide tool 80 that may be inserted by the surgeon into theintervertebral space 23. The method of the present invention, therefore, further comprises the optional step of inserting a guidingtool 80 into anintervertebral space 23. - The
insertion tool 60 may then be slid along theguide tool 80 until theinsertion tool 60 is at the selected position for insertion of avertebral spacer 10 in theintervertebral space 23. Theguide tool 80 is then removed from thechannel 61 of theinsertion tool 60, as shown inFIG. 42 , leaving theinsertion tool 60 inserted betweenadjacent vertebrae 20. Alternatively, theguide tool 80 may remain in theinsertion tool 60 while theinsertion tool 60 is rotated in theintervertebral space 23, thereby providing torsional strength to theinsertion tool 60. Theinsertion tool 60 may be inserted into theintervertebral space 23 with thechannel 61 facing avertebra 20, as shown inFIG. 42 . Theinsertion tool 60 may then be rotated so that theopen channel 61 of thetool 60 is not facing avertebra 20, as shown inFIG. 43 . - As shown in
FIG. 44 , the cuttingtool 70 is optionally slid along thechannel 61 of theinsertion tool 60 to engage avertebra 20 and to chisel a vertebralspace receiving slot 78 in thevertebrae 20. Alternatively, two vertebralspacer receiving slots 78 may be cut in opposing faces ofadjacent vertebrae 20. The strikinghead 73 of thecutting tool 70 may be struck with astriking tool 77 to increase the cutting action of the cuttinghead 71. - As shown in
FIG. 45 , the cuttingtool 70 is removed from the patient by slideably withdrawing thecutting tool 70 back through thechannel 61 of theinsertion tool 60. Avertebral spacer 10 according to the present invention may then be slideably engaged with theinsertion tool 60, wherein at least onespace guide 66 on theinsertion tool 60 engages with afirst guiding groove 17 and optionally asecond guiding groove 18 of thevertebral spacer 10. Thepusher 63 may then be slideably engaged with thechannel 61 and contacted with thevertebral spacer 10. Thepusher 63 is advanced along thechannel 61 of theinsertion tool 60 thereby pushing thevertebral spacer 10 into the vertebralspacer receiving slot 78 or receivingslots 78 in theadjacent vertebrae 20. It is also contemplated, however, that a vertebralspacer receiving slot 80 may not be cut in theadjacent vertebrae 20 and that the insertedvertebral spacer 10 may optionally contact the uncut surface of thevertebrae 20. - It is to be understood that the methods of the present invention for the delivery of a
vertebral spacer 10 to anintervertebral space 23 may also be used to deliver twovertebral spacers 10, as shown inFIG. 47 , it is further understood that a hardening biocompatible composition may be delivered between the vertebral spacers, thereby forming a larger effective spacer and optionally promoting bone growth to secure thevertebral spacers 10 to the vertebrae. - Yet another aspect of the present invention is a kit for delivering a vertebral spacer to the spinal column of a patient, comprising an insertion tool for delivering a vertebral spacer to the spinal column of a patient and having a channel having an inner surface, a pusher having a distal end is slideably disposable in the channel of the insertion tool, a vertebral spacer slideably disposable in the channel of the insertion tool, a cutting tool having a shaft with a distal end and a proximal end, and a cutting head secured to the distal end of the shaft, wherein the cutting tool is slideably disposable in the insertion tool providing that the pusher and the vertebral spacer are not disposed therein. Instructions for the use of the system and its various components to deliver a vertebral spacer to the spinal column of a patient also generally are included or provided.
- The kit of the present invention further can include an optional guiding tool configured to slideably engage the channel of the insertion device, and instructions for the operation thereof.
- With respect to the above description, it is to be realized that the optimum dimensional relationships for the parts of the invention, to include variations in size, materials, shape, form, function and manner of operation, assembly, and use, are deemed readily apparent and obvious to one skilled in the art, and all equivalent relationships to those illustrated in the drawing and described in the specification are intended to be encompassed by the present invention. Further, the various components of the embodiments of the invention may be interchanged to produce further embodiments and these further embodiments are intended to be encompassed by the present invention.
- Although the invention has been described in detail for the purpose of illustration, it is understood that such detail is solely for that purpose, and variations can be made therein by those skilled in the art without departing from the spirit and scope of the invention which is defined by the following claims.
Claims (38)
1. A vertebral spacer comprising:
(a) a body having an upper surface and a lower surface, an anterior face and a posterior face, the anterior face and the posterior face extending from the lower surface to the upper surface; and
(b) a first guiding groove in one of the upper surface and the lower surface.
2. The vertebral spacer of claim 1 , further comprising a second guiding groove in the surface not having the first guiding groove therein.
3. The vertebral spacer of claim 1 , wherein the upper surface is non-parallel to the lower surface.
4. The vertebral spacer of claim 1 , wherein the body has a rectangular cross-section.
5. The vertebral spacer of claim 1 , wherein the body has at least one protrusion capable of contacting a vertebra.
6. The vertebral spacer of claim 1 , wherein the body has at least one protrusion on each of the upper surface and lower surface thereof.
7. The vertebral spacer of claim 1 , wherein the body further comprises at least one bore capable of receiving tissue growth.
8. The vertebral spacer of claim 1 , wherein the body is composed of a biocompatible material selected from the group consisting of a biocompatible polymer, a metal, bone material or a combination thereof.
9. The vertebral spacer of claim 1 , wherein the body is a section from the shaft of a femur and comprises a portion of the femur medullary cavity.
10. The vertebral spacer of claim 1 , wherein the body further comprises a metallic sheath.
11. The vertebral spacer of claim 10 , wherein the metallic sheath further comprises a plurality of protrusions thereon, and wherein the protrusions are capable of contacting a vertebra.
12. The vertebral spacer of claim 1 , wherein the body further comprises at least one slot extending inwardly from the upper surface or the lower surface.
13. The vertebral spacer of claim 12 , wherein the at least one slot has a bone core therein.
14. The vertebral spacer of claim 1 , wherein the body comprises a plurality of bonded layers.
15. The vertebral spacer of claim 14 , wherein at least one bonded layer comprises a bone core.
16. The vertebral spacer of claim 15 , wherein the bonded layers are bonded by an adhesive.
17. The vertebral spacer of claim 15 , and further comprising at least one linking pin for bonding.
18. The vertebral spacer of claim 15 , and further comprising the linking pins for bonding.
19. A system for delivering a vertebral spacer to the spinal column of a patient, comprising:
(a) an insertion tool for delivering a vertebral spacer to the spinal column of a patient, comprising a channel having an inner surface;
(b) a pusher having a distal end is slideably disposable in the channel of the insertion tool;
(c) a vertebral spacer slideably disposable in the channel of the insertion tool; and
(d) a cutting tool having a shaft with a distal end and a proximal end, and a cutting head secured to the distal end of the shaft, wherein the cutting tool is slideably disposable in the insertion tool providing that the pusher and the vertebral spacer are not disposed therein.
20. The system of claim 19 , further comprising a guiding tool configured to slideably engage the channel of the insertion device.
21. The system of claim 19 , wherein the insertion tool has a spacer guide slideably engaging the vertebral spacer.
22. The system of claim 21 , wherein the spacer guide is at least one flange disposed on the channel of the insertion tool.
23. The system of claim 21 , wherein the spacer guide is at least one rib longitudinally disposed on the inner surface of the channel of the insertion tool.
24. The system of claim 21 , wherein the spacer guide is a protrusion on the inner surface of the channel of the insertion device.
25. The system of claim 21 , wherein the spacer guide comprises a plurality of protrusions on the inner surface of the channel of the insertion device.
26. The system of claim 19 , wherein the distal end of the pusher is configured to receive the vertebral spacer.
27. The system of claim 19 , wherein the cutting tool further comprises a striking head connected to the proximal end of the shaft.
28. The system of claim 19 , wherein the cutting tool further comprises an attachment member for securing the cutting head to the distal end of the shaft.
29. A method for delivering a vertebral spacer into a patient using the system according to claim 19 , comprising the steps of:
(a) inserting an insertion tool into an intervertebral space of the spinal column of a patient;
(b) engaging at least a first guiding groove, of a vertebral spacer with a space guide of the insertion tool;
(c) urging the vertebral spacer into the intervertebral space and thereby into a vertebral spacer receiving slot defined in a vertebra of the patient; and
(d) removing the pusher and the insertion tool from the patient.
30. The method of claim 29 , wherein the insertion tool is rotated into a position substantially normal to a vertebra.
31. The method of claim 29 , further comprising the steps of:
(a) inserting a guide tool into a selected position in an intervertebral space;
(b) sliding the insertion tool along the guide tool;
(c) directing the insertion tool to the selected position in an intervertebral space; and
(d) removing the guide tool from the insertion tool.
32. The method of claim 29 , further comprising the steps of:
(a) sliding the cutting tool according to claim 18 in the insertion tool;
(b) contacting the vertebra with the cutting tool;
(c) cutting the vertebral spacer receiving slot in the surface of the vertebra defining the intervertebral space;
(d) removing the cutting tool from the patient; and
(e) pushing the vertebral spacer into the vertebral spacer receiving slot of the vertebra.
33. The method of claim 32 , further comprising the steps of repeating steps (a)-(e), thereby delivering a second vertebral spacer to the intervertebral space.
34. The method of claim 29 wherein the vertebral spacer is according to claim 11 , and further comprising the step of delivering a hardening biocompatible composition to the femur medullary cavity.
35. The method of claim 34 , wherein the hardening biocompatible composition comprises a bone composition, an organic polymer, methyl methylacrylate, an osteogenic composition or a combination thereof.
36. The method of claim 34 , wherein the hardening biocompatible composition comprises hydroxyapatite.
37. A kit for delivering a vertebral spacer to the spinal column of a patient comprising:
(a) an insertion tool for delivering a vertebral spacer to the spinal column of a patient, comprising a channel having an inner surface;
(b) a pusher having a distal end;
(c) a vertebral spacer capable of being slideably disposed along the channel of the insertion tool;
(d) a cutting tool having a shaft with a distal end and a proximal end, and a cutting head secured to the distal end of the shaft, wherein the cutting tool is capable of being slideably disposed along the insertion tool providing that the pusher and the vertebral spacer are not disposed therein; and
(e) instructions for the use of the system to deliver a vertebral spacer to the spinal column of a patient
38. The kit of claim 37 , further comprising the guiding tool configured to slideably engage the channel of the insertion device and instructions for the operation thereof.
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US12/826,776 US20110071637A1 (en) | 2000-09-08 | 2010-06-30 | System and methods for inserting a vertebral spacer |
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US12/826,776 Abandoned US20110071637A1 (en) | 2000-09-08 | 2010-06-30 | System and methods for inserting a vertebral spacer |
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US10/923,499 Abandoned US20050071009A1 (en) | 2000-09-08 | 2004-08-20 | System and methods for inserting a vertebral spacer |
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US9730802B1 (en) | 2014-01-14 | 2017-08-15 | Nuvasive, Inc. | Spinal fusion implant and related methods |
US10335287B2 (en) | 2014-01-14 | 2019-07-02 | Nuvasive, Inc. | Spinal fusion implant and related methods |
US11497621B2 (en) | 2014-01-14 | 2022-11-15 | Nuvasive, Inc. | Inserter for implanting a spinal implant |
WO2016207797A1 (en) | 2015-06-25 | 2016-12-29 | Changzhou Kanghui Medical Innovation Co., Ltd | Assembly comprising a delivery system and an interbody cage |
Also Published As
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US20030171814A1 (en) | 2003-09-11 |
US6824565B2 (en) | 2004-11-30 |
US20050071009A1 (en) | 2005-03-31 |
US20020045944A1 (en) | 2002-04-18 |
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