WO2002067792A2 - Flexible spine stablization systems - Google Patents
Flexible spine stablization systems Download PDFInfo
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- WO2002067792A2 WO2002067792A2 PCT/US2002/006134 US0206134W WO02067792A2 WO 2002067792 A2 WO2002067792 A2 WO 2002067792A2 US 0206134 W US0206134 W US 0206134W WO 02067792 A2 WO02067792 A2 WO 02067792A2
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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
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- A61F2/08—Muscles; Tendons; Ligaments
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- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
- A61B17/7059—Cortical plates
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- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/80—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Definitions
- the present invention relates to orthopedic implants, and more particularly, to flexible spinal stabilization systems.
- Interbody fusion device, artificial discs, interbody spacers and other devices have been inserted in a spinal disc space or engaged to a vertebral body. For example, as shown in
- a pair of interbody fusion devices II and 12 are inserted into an intradiscal space between the L5 and SI levels of the spinal column.
- Aorta Al and vena cava A2 along with other tissue and vasculature also extend along the anterior aspect of the spinal column.
- the anterior longitudinal ligament AL extends along the anterior portion of the disc space.
- the disc space is surrounded by annulus fibrosus or annulus fibers AF. Insertion of implants II and 12 into the disc space can be facilitated by the removal of all or a portion of the anterior longitudinal ligament AL and the annulus fibers AF.
- a rigid metal construct to each of the vertebral bodies on either side of the spinal disc space after inserting devices or performing surgical procedures in the disc space or on the vertebral bodies.
- a rigid metal plate can be placed along the anterior aspect of the vertebrae and secured to the L5 and SI levels after insertion of implants II and 12 into the disc space therebetween.
- a rigid rod or plate can be secured to the posterior portions of vertebrae VI and V2 after anterior insertion of implants II and 12.
- the present invention is directed to spine stabilization systems that are flexible and include components that replicate, substitute and/or augment the natural fiber orientation of the anterior longitudinal ligament and annulus tissue.
- the components resist loading applied by extension and rotation of the spine, while the flexibility of the components does not subject them to the compressive loading of the spinal column segment to which it is secured.
- FIG. 1 is an elevational view of a spinal column segment having a pair of interbody fusion devices inserted into a disc space.
- Fig. 2 is a plan view of a disc space of a spinal column segment and the surrounding tissue and vasculature.
- Fig. 3 is a perspective view a spinal column segment with its associated ligaments.
- Figs. 4(a) and 4(b) illustrate various features of a spinal disc space.
- Figs. 5(a) and 5(b) illustrate various structural properties of the annulus fibrosous.
- Fig. 6 is a flexible spine stabilization system according to one embodiment secured to a spinal column segment.
- Figs. 7(a) through 7(c) show various components of the system of Fig. 6.
- Fig. 8 is an elevational view of another embodiment flexible spine stabilization system secured to a spinal column segment.
- Fig. 8a is an enlarged detail view of a portion of the system of Fig. 8.
- Fig. 9 is elevational view of yet another embodiment flexible spine stabilization system secured to a spinal column segment.
- Fig. 10(a) is an elevational view of a further embodiment flexible spine stabilization system.
- Fig. 10(b) is the system of Fig. 10(a) secured to a spinal column segment.
- the systems can extend across one or more vertebral levels.
- the systems are configured to replicate, substitute and/or augment the structure and function of the natural occurring fibers that protect the intervertebral disc space.
- the systems can be used in lieu of the placement of a rigid anterior plate across one or more disc spaces after insertion of an interbody fusion device into the disc space.
- the systems can be used in non- interbody fusion procedures.
- the spine stabilization systems include a member having a first set of one or more components oriented generally in the direction of the annulus fibers, and a second set of components oriented generally in the direction of the fibers of the anterior longitudinal ligament.
- the spine stabilization systems of the present invention replicate, augment and/or substitute the load resistant properties capabilities of the annulus fibers and anterior longitudinal ligament.
- a spinal column segment including an upper vertebra VI and lower vertebra V2 is illustrated.
- the spinal column segment includes anterior longitudinal ligament AL extending along the anterior aspects of vertebra VI and vertebra V2 and across the intervertebral disc space between vertebrae VI and V2.
- the nucleus of the disc space is protected by annulus fibers AF.
- the spinal column segment further includes posterior longitudinal ligament PL, intertransverse ligament IL, facet capsular ligament FC, interspinous ligament ISL, superspinous ligament SSL, and ligamentum flavum LF.
- the spine is designed in such a way that when the functional spinal unit is subjected to different complex force and torque vectors, the individual ligaments provide tensile resistance to external loads by developing tension. When a surgical procedure interrupts or removes a portion ofthese ligaments, the ability of the spinal unit to resist these complex force and torque vectors is compromised.
- the anterior longitudinal ligament AL is an uni-axial structure, and is most effective in carrying loads along the direction in which the fibers run.
- the anterior longitudinal ligament AL has a fibrous tissue structure that arises from the anterior aspect of the basioccipital and is attached to the atlas and the anterior surfaces of all vertebrae, down to and including a part of the sacrum. It is firmly attached to the edges of the vertebral bodies, but is less firmly affixed to the annulus fibers AF.
- the width of the anterior longitudinal ligament AL diminishes at the level of disc and is narrower and thicker in the thoracic region of the spine.
- the fibers of the anterior longitudinal ligament run along the length of the spinal column in the direction of the central spinal column axis and transverse to axial plane H.
- the fibers of the anterior longitudinal ligament AL are much like rubber bands in that they readily resist tensile forces, but buckle when subjected to compressive forces.
- annulus fibrosus AF includes a number of concentric laminated bands, designated as annulus laminates AN1, AN2, AN3, and AN4 as shown in Fig. 4(a).
- annulus laminates AN have fibers oriented either +30 degrees or -30 degrees with respect to axial plane H of the spinal column.
- the AN fibers are oriented about +60 degrees or about -60 degrees with respect to the fibers of the anterior longitudinal ligament AL.
- the fibers of the adjacent annulus laminates AN are non-orthogonal with respect to axial plane H and to one another, forming a criss-cross pattern as shown by AN1 and AN2 of Fig. 2(b).
- AN1 and AN2 of Fig. 2(b)
- the resection, removal and other cutting required of the annulus laminates AN and anterior longitudinal ligament AL disrupts fiber orientation and continuity.
- FIGs. 5(a) and 5(b) the tensile properties and strength properties of the annulus fibrosis will now be discussed.
- the annulus fibers AF resist tensile forces and torque or rotational forces applied to the spinal column segment.
- Fig. 5(a) the tensile stiffness of the annulus AF in different directions is shown.
- the stiffness of annulus fibrosus AF is highest along a direction oriented 15 degrees with respect to axial plane H.
- the strength of the annulus AF has been found to be greatest along a direction oriented 30 degree with respect to horizontal axis H extending through the disc space. It has further been found that the strength of the annulus AF is three times greater along this 30 degree axis as compared to the strength along axial plane H.
- System 20 is secured to vertebra VI and vertebra V2 and extends across the disc space D. It is contemplated that one or more interbody fusion devices, interbody spacers, artificial discs or other implant can be inserted into disc space D in a procedure prior to attachment of system 20 to vertebrae VI and V2. It is also contemplated that a surgical procedure can be performed in or on disc space D such as, for example, removal of discal material to repair a herniated disc. In such procedures, the excision or disruption to the annulus fibrosus AF and the anterior longitudinal ligament AL compromises the ability ofthese spinal structures to resist extension, torsion, and lateral bending of the spinal column.
- System 20 can restore this ability and can cover the entry made through the annulus fibrosis AF and anterior longitudinal ligament AL, preventing devices inserted into the disc space from backing out or protruding through the created opening.
- System 20 includes diagonal components and vertical components.
- the diagonal components can be oriented in the range of 15 degrees to 60 degrees with respect to axial plane H when the devices are secured to the vertebrae.
- the vertical components extend generally perpendicular to axial plane H. Stated another way, a first set of diagonal components extends at an angle Al in the range of +30 degrees to +75 degrees relative to the vertical components, and a second set of diagonal components extends transverse to the first set and at an angle A2 in the range of -30 degrees to -75 degrees relative to the vertical components.
- the first set of diagonal components extends at an angle Al in the range of +45 degrees to +60 degrees relative to the vertical components
- the second set of diagonal components extends transverse to the first set and at an angle A2 in the range of -45 degrees to -60 degrees relative to the vertical components.
- the first set of diagonal components extends at an angle Al of about +60 degrees relative to the vertical components
- the second set of diagonal components extends transverse to the first set and at an angle A2 of about -60 degrees relative to the vertical components.
- System 20 includes a member extending between the first and second vertebrae VI and V2.
- the member includes a first layer 30 which has a number of vertically oriented components 34 and a number of horizontally oriented components 32.
- Components 32, 34 are interwoven or otherwise attached to form a grid-like or mesh pattern having a number of square apertures therethrough.
- the member further includes a second layer 35 as shown in Fig. 7(b) having a number of first diagonal components 36 and a number of second diagonal components 38.
- Diagonal components 36 and 38 are interwoven or otherwise attached to form a grid- like or mesh pattern having a number of diamond- shaped apertures.
- Each layer 30, 35 is flexible in compression yet inelastic or substantially inelastic to resist tensile loading.
- the individual components 32, 34, 36, 38 of each layer can be made from a small diameter or cross-section wire, fiber, rod, strand or other elongated component. As shown in Fig.
- first layer 30 is placed on top of second layer 35 and secured thereto via grommets 26.
- Other securement devices and techniques are also contemplated, including, for example, other fasteners such as rivets, clamps, cables, sutures, staples, and hooks; and chemical/thermal bonding, such as welding or adhesives.
- Other embodiments contemplate that layers 30, 35 are not engaged to one another, but rather simply placed on top of one another when secured to the spinal column.
- a number of openings 24 are formed through the layers to accommodate fasteners 22. In the illustrated embodiment, four such openings are formed, with one opening positioned adjacent each corner. Eyelets or grommets 26 extend around each hole 24. As shown in Fig. 6, bone engaging fasteners 22 can be placed through corresponding ones of the holes
- layers 30, 35 can be rounded to provide gradual transitions between the vertical and horizontal edges thereof.
- Other embodiments contemplate one opening 24 at each vertebra, and further embodiments contemplate more than two openings 24 at each vertebra.
- Other embodiments also contemplate that no openings are provided, but rather the fasteners extend directly through the layers of material.
- the vertically extending components 34 of first layer 30 are oriented and function in a manner similar to the longitudinal fibers of the anterior longitudinal ligament AL.
- Diagonal components 36, 38 of second layer 35 are non-orthogonally oriented with respect to the vertical components 34, and are oriented and function similar to annulus fibers AF.
- system 20 replaces, substitutes, and/or augments the function of the naturally occurring fibers of the anterior longitudinal ligament AL and the annulus fibrosis AF.
- the orientation of the components of system 20 are such that forces caused by extension, rotation, and lateral bending of the spinal column are resisted in a manner the same as or similar to the natural occurring anatomical structures provided to resist such forces. Refe ⁇ ing to Fig. 8 and 8a, there is provided a spine stabilization system 40 having a layer
- Layer 46 includes a number of interwoven components that include at least longitudinally and diagonally oriented components.
- first diagonal components 47, second diagonal components 48, vertical components 49, and horizontal components 45 are provided.
- the first and second diagonal components 47, 48 are oriented and function similar to the fibers of the annulus fibrosis AF, and the vertical components 49 are oriented and function similar to the anterior longitudinal ligament AL.
- Small apertures are provided through layer 46 between its components. Eyelets or grommets 44 each surround a corresponding one of the holes provided through layer 46. Bone engaging fasteners 42 extend through these holes to attach system 40 to vertebra VI and vertebra V2.
- System 50 includes a member formed by a layer 56 made from components interwoven such that there are no apertures through layer 56, providing a substantially solid wall across disc space D.
- Layer 56 includes a number of holes formed therethrough surrounded by grommets or eyelets 54.
- Fasteners 52 extend through the holes in order to secure the flexible system 50 to vertebra VI and V2 across the annulus fibrosis AF.
- System 60 includes member having a first vertical component 66 and a second vertical component 68.
- Vertical components 66 and 68 are interconnected by a first diagonal component 70 and a second diagonal component 72.
- first diagonal component 70 extends from a right lateral side of vertebral body V2 across the sagittal plane L to a left lateral side of vertebral body VI.
- Second diagonal component 72 extends from the left lateral side of vertebral body V2 across thee sagittal plane L to the right lateral side of vertebral body VI .
- the first vertical component 66 extends from a left lateral side of vertebral body V2 to the left lateral side of vertebral body VI offset to one side of sagittal plane L.
- Second vertical component 68 extends from the right lateral side of vertebral body V2 to the right lateral side of vertebral body VI offset to the other side of sagittal plane L.
- a hole 64 for receiving a fastener 62 to attach system 60 to vertebrae VI and V2.
- the vertically oriented components 66, 68 are oriented to replace, substitute and/or augment the structure function of the anterior longitudinal ligament AL and resist at least extension forces applied to the spinal column segment.
- the diagonal components 70, 72 are non-orthogonally oriented with respect to the vertically oriented components 66, 68 and resist at least rotational and torque forces on the spinal column segment.
- diagonal components 70, 72 are oriented and function similar to the fibers of the annulus fibrosis AF.
- the components of the flexible spinal stabilization systems can be made from one or a combination of metal material, polymeric material, ceramic material, shape memory material, and composites thereof.
- the components of the systems can also be coated or impregnated with anti-adhesive material that will prevent tissue and vasculature from attaching thereto.
- the components of the systems can be provided in multiple layers each including one or more components with the desired orientation and placed one on top of the other, or the components can be provided in a single interwoven layer that includes the desired component orientation.
- the components are made from metal wire mesh of suitable tensile strength and which is not subject to substantial creep deformation or in vitro degradation.
- the wire can be made from stainless steel, cobalt- chrome alloy, titanium, titanium alloy, or nickel-titanium, among others.
- the components are made from a soft fiber material.
- Soft fiber material can include polymeric material, such as SPECTRA fiber, nylon, carbon fiber and polyethylene, among others. Examples of suitable metal polymers include DACRON and GORE-TEX.
- One advantage provided by a soft fiber design is that the risk of tissue and vascular injury is further mitigated by reducing the abrasive qualities of the component material.
- the components fibers can be radiolucent, allowing radiographic imaging for assessment and monitoring of the disc space and any implant, fusion devices, or artificial disc inserted therein.
Abstract
Description
Claims
Priority Applications (5)
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DE60228417T DE60228417D1 (en) | 2001-02-28 | 2002-02-27 | FLEXIBLE SYSTEMS FOR STABILIZING THE SPINE |
JP2002567167A JP4145656B2 (en) | 2001-02-28 | 2002-02-27 | Flexible spine stabilization system |
CA002439482A CA2439482A1 (en) | 2001-02-28 | 2002-02-27 | Flexible spine stablization systems |
AU2002244201A AU2002244201B8 (en) | 2001-02-28 | 2002-02-27 | Flexible spine stabilization systems |
EP02709732A EP1367953B1 (en) | 2001-02-28 | 2002-02-27 | Flexible spine stabilization systems |
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US27210201P | 2001-02-28 | 2001-02-28 | |
US60/272,102 | 2001-02-28 |
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EP (1) | EP1367953B1 (en) |
JP (1) | JP4145656B2 (en) |
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AU (1) | AU2002244201B8 (en) |
CA (1) | CA2439482A1 (en) |
DE (1) | DE60228417D1 (en) |
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Also Published As
Publication number | Publication date |
---|---|
EP1367953B1 (en) | 2008-08-20 |
AU2002244201B2 (en) | 2006-04-13 |
US20080132950A1 (en) | 2008-06-05 |
US7326249B2 (en) | 2008-02-05 |
WO2002067792A3 (en) | 2002-11-28 |
US20040078082A1 (en) | 2004-04-22 |
EP1367953A1 (en) | 2003-12-10 |
DE60228417D1 (en) | 2008-10-02 |
AU2002244201B9 (en) | 2006-06-08 |
JP2004530460A (en) | 2004-10-07 |
JP4145656B2 (en) | 2008-09-03 |
ATE405220T1 (en) | 2008-09-15 |
CA2439482A1 (en) | 2002-09-06 |
AU2002244201B8 (en) | 2006-08-31 |
US20050119749A1 (en) | 2005-06-02 |
US6852128B2 (en) | 2005-02-08 |
US7041138B2 (en) | 2006-05-09 |
US20060200140A1 (en) | 2006-09-07 |
US6652585B2 (en) | 2003-11-25 |
US20020120269A1 (en) | 2002-08-29 |
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