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US20060009846A1 - Flexible systems for spinal stabilization and fixation - Google Patents

Flexible systems for spinal stabilization and fixation Download PDF

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Publication number
US20060009846A1
US20060009846A1 US11215853 US21585305A US2006009846A1 US 20060009846 A1 US20060009846 A1 US 20060009846A1 US 11215853 US11215853 US 11215853 US 21585305 A US21585305 A US 21585305A US 2006009846 A1 US2006009846 A1 US 2006009846A1
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implant
tunnel
vertebra
end
opening
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Abandoned
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US11215853
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Hai Trieu
Jon Serbousek
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Hai Trieu
Jon Serbousek
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    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2310/00Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
    • A61F2310/00005The prosthesis being constructed from a particular material
    • A61F2310/00179Ceramics or ceramic-like structures
    • A61F2310/00293Ceramics or ceramic-like structures containing a phosphorus-containing compound, e.g. apatite
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2310/00Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
    • A61F2310/00005The prosthesis being constructed from a particular material
    • A61F2310/00359Bone or bony tissue

Abstract

Systems for spinal stabilization and fixation replace, reconstruct or augment the spinal ligamentous and/or bony tissues resected during surgical procedures. The spinal stabilization system includes at least an implant configured to span the intervertebral disc space with at least one of its ends attached to a respective vertebral body by at least one anchor. The system has a low profile conformable to the spinal anatomy.

Description

    CROSS-REFERENCE TO RELATED APPLICATION
  • [0001]
    This application is a divisional of U.S. patent application Ser. No. 10/083,199 filed on Feb. 26, 2002, which is hereby incorporated by reference, which claims the benefit of the filing date of Provisional Patent Application No. 60/272,114 filed on Feb. 28, 2001.
  • BACKGROUND
  • [0002]
    The present invention is directed devices and methods for use in spinal surgery, and more particularly to devices and methods for stabilizing the spine.
  • [0003]
    Various spinal surgical procedures require access of a subject disc space or vertebral body, such as for the repair of a herniated disc or vertebral body, the insertion of one or more interbody fusion devices, interbody spacers, or artificial discs. In order to access a spinal column, one or more spinal ligaments and bony tissue may have to be severed or at least partially resected to allow insertion of devices and/or surgical instruments into or to the disc space or vertebral body. It also may be desirable to augment or replace existing spinal ligaments and bony tissue. Posterior or anterior rigid metal constructs can also be used to stabilize the spinal column after these techniques are completed.
  • [0004]
    Rigid metal plates or rods on the anterior, antero-lateral, lateral or posterior portions of the spinal column segment are in close contact with and exposed to the adjacent vasculature and tissue. It is desirable that the potential for screw back out, loosening, bending of the construct, and stress shielding be reduced or eliminated in view of this close contact with the vasculature and the surrounding tissue.
  • SUMMARY OF THE INVENTION
  • [0005]
    The present invention is directed systems and methods for spinal stabilization and fixation. The systems are useful in the replacement, reconstruction or augmentation of spinal ligamentous or bony tissues, and also in resisting the tensile and rotational loading applied thereto by spinal motion.
  • [0006]
    In one form, the spinal stabilization systems include at least an elongated implant configured to span the intervertebral disc space with its ends attached to a respective vertebral body. The ends of the implant can be placed in tunnels formed in the adjacent vertebrae. The implant can have a substantially flexible yet substantially inelastic body with a low profile capable of conforming to the spinal anatomy. The anchors used to attach the ends of the implant to the vertebrae can be at least partially concealed in the vertebral body to which it is engaged, further reducing the profile of the device. Examples of suitable anchors include interference screws, suture anchors, bone screws, buttons, pin fasteners, and staples. It is further contemplated that the implant and anchors can be made from nonresorbable or resorbable material.
  • [0007]
    In one technique, the stabilization system can be attached to and stabilize the anterior portion of the spinal column. The stabilization system can also be attached to and stabilize the lateral or antero-lateral portion of the spinal column. In another technique, the stabilization system is attached to a posterior portion of the spinal column via anchors engaged to the vertebrae at any one of a number of locations, including but not limited to the facets, pedicles, pars, transverse processes, or spinous processes.
  • [0008]
    There are also various methods for securing a flexible implant to adjacent vertebral bodies in which the anchor and at least a portion of the implant is placed in a tunnel formed in the vertebral body. The attachment techniques provide a low profile system that reduces exposure and contact with the adjacent anatomic structures.
  • [0009]
    These and other forms, aspects, embodiments, features and advantages of the present invention will be apparent from the following description of the illustrated embodiments.
  • BRIEF DESCRIPTION OF THE FIGURES
  • [0010]
    FIG. 1 is a side elevational view in partial section of a spinal column segment having an interbody fusion device inserted into the disc space and one embodiment spine stabilization system attached to the vertebral bodies.
  • [0011]
    FIG. 2 is a side elevational view in partial section of a spinal column segment having an artificial disc inserted into the disc space and another embodiment spine stabilization system attached to the vertebral bodies.
  • [0012]
    FIG. 3 is an anterior elevational view of a spinal column segment having another embodiment spine stabilization system attached thereto.
  • [0013]
    FIG. 4 is an anterior view of a spinal column segment having a further embodiment spine stabilization system attached thereto.
  • [0014]
    FIG. 5 is a side elevational view in partial section of a spinal column segment having another embodiment spine stabilization system attached thereto.
  • [0015]
    FIG. 6 is a side elevational view in partial section of a spinal column segment having a further embodiment spine stabilization system attached thereto.
  • [0016]
    FIG. 7 is a perspective view of one embodiment of an anchor for attaching spine stabilization systems to vertebral bodies.
  • [0017]
    FIG. 8 is a side elevational view in partial section of a spinal column segment having another embodiment spine stabilization system attached thereto.
  • [0018]
    FIG. 9 is a side elevational view in partial section of a spinal column segment having another embodiment spine stabilization system attached thereto.
  • [0019]
    FIG. 10 is a side elevational view in partial section of a spinal column segment having another embodiment spine stabilization system attached thereto.
  • [0020]
    FIG. 11 is a side elevational view in partial section of a spinal column segment having another embodiment spine stabilization system attached thereto.
  • [0021]
    FIG. 12 is an anterior elevational view in partial section of a spinal column segment having another embodiment spine stabilization system attached thereto.
  • [0022]
    FIG. 13 is an anterior elevational view in partial section of a spinal column segment having another embodiment spine stabilization system attached thereto.
  • [0023]
    FIG. 14 is a side elevational view in partial section of a spinal column segment having another embodiment spine stabilization system attached thereto.
  • [0024]
    FIG. 15 is a side elevational view in partial section of a spinal column segment having another embodiment spine stabilization system attached thereto.
  • [0025]
    FIG. 16 is an anterior elevational view in partial section of a spinal column segment having another embodiment spine stabilization system attached thereto.
  • [0026]
    FIG. 17 is an anterior elevational view in partial section of a spinal column segment having another embodiment spine stabilization system attached thereto.
  • [0027]
    FIG. 18 is an anterior elevational view in partial section of a spinal column segment having another embodiment spine stabilization system attached thereto.
  • [0028]
    FIG. 19 is an anterior elevational view in partial section of a spinal column segment having another embodiment spine stabilization system attached thereto.
  • [0029]
    FIG. 20 is a side elevational view of a spinal column segment having a posterior spine stabilization system attached thereto.
  • [0030]
    FIG. 21 is a side elevational view of a spinal column segment having another embodiment posterior spine stabilization system attached thereto.
  • [0031]
    FIG. 22 is a posterior elevational view of a spinal column segment having another embodiment posterior spine stabilization device attached thereto.
  • DESCRIPTION OF THE ILLUSTRATED EMBODIMENTS
  • [0032]
    For the purposes of promoting an understanding of the principles of the invention, reference will now be made to the illustrated embodiments and specific language will be used to describe the same. It will nevertheless be understood that no limitation of the scope of the invention is thereby intended. Any such alterations and further modifications of the invention, and any such further applications of the principles of the invention as illustrated herein are contemplated as would normally occur to one skilled in the art to which the invention relates.
  • [0033]
    The present invention includes spine stabilization systems in which flexible implants are anchored to the adjacent vertebrae. The stabilization systems have application in stabilizing the anterior, antero-lateral, lateral and/or posterior portions of a spinal column segment including one or more vertebral levels. The implants have a low profile and are conformable to the spinal anatomy to minimize intrusion into the surrounding tissue and vasculature. The implants attach to vertebrae and prevent separation of the vertebrae while allowing normal extension and articulation of the spinal column segment. Portions of the implants and the anchors attaching the implant to vertebrae can be at least partially or fully embedded within the vertebrae to minimize intrusion into the surrounding tissue and vasculature.
  • [0034]
    It is contemplated that the implants of the spine stabilization systems described herein can be made from resorbable material, nonresorbable material and combinations thereof. In one example, resorbable implants can be used with interbody fusion devices since a permanent exterior stabilization may not be desired after fusion of the vertebrae. It is also contemplated that the anchors used to attach the implants to the vertebrae can be made from resorbable material, nonresorbable material, and combinations thereof.
  • [0035]
    The implants can be flexible, tear resistant, and/or suturable. The implant can be fabricated from synthetic flexible materials in the form of fabrics, non-woven structures, two or three dimensional woven structures, braided structures, and chained structures. The implants can also be fabricated from natural/biological materials, such as autograft or allograft, taken from patellar bone-tendon-bone, hamstring tendons, quadriceps tendons, or Achilles tendons, for example. Growth factors or cells can be incorporated into the implant for bone ingrowth and bony attachment or for soft tissue ingrowth. Possible growth factors that can be incorporated include transforming growth factor β1, insulin-like growth factor 1, platelet-derived growth factor, fibroblast growth factor, bone morphogenetic protein, LIM mineralization protein (LMP), and combinations thereof.
  • [0036]
    Possible implant materials include synthetic resorbable materials such as polylactide, polyglycolide, tyrosine-derived polycarbonate, polyanhydride, polyorthoester, polyphosphazene, calcium phosphate, hydroxyapatite, bioactive glass and combinations thereof. Possible implant materials also include natural resorbable materials such as autograft, allograft, xenograft, soft tissues, connective tissues, demineralized bone matrix, and combinations thereof. Possible implant material further include nonresorbable materials such as polyethylene, polyester, polyvinyl alcohol, polyacrylonitrile, polyamide, polytetrafluorethylene, poly-paraphenylene terephthalamide, cellulose, shape-memory alloys, titanium, titanium alloys, stainless steel, and combinations thereof.
  • [0037]
    The spine stabilization systems described herein include anchors to attach the implant to the vertebrae. It is contemplated the anchors can be, for example, interference screws or anchors, gull anchors, suture anchors, pin fasteners, bone screws with spiked washers, staples, and buttons. It is contemplated that the anchors can be made from resorbable materials, nonresorbable materials, and combinations thereof. Possible synthetic resorbable materials include polylactide, polyglycolide, tyrosine-derived polycarbonate, polyanhydride, polyorthoester, polyphosphazene, calcium phosphate, hydroxyapatite, bioactive glass, and combinations thereof. Possible natural resorbable materials include cortical bone, autograft, allograft, and xenograft. Possible nonresorbable materials include carbon-reinforced polymer composites, shape-memory alloys, titanium, titanium alloys, cobalt chrome alloys, stainless steel, and combinations thereof.
  • [0038]
    Referring now to FIG. 1, there is shown a spine stabilization system attached to vertebrae V1 and V2. Stabilization system 28 includes a flexible implant 30 that extends along the anterior faces of vertebrae V1 and V2, and is attached to first vertebra V1 and the second vertebra V2. A fusion device 34 has been inserted into disc space D for fusion of vertebra V1 and vertebra V2. Implant 30 can resist extension, flexion, and/or lateral bending loads created by motion of the spinal column depending on the location or locations of the spinal column segment on which the implant is positioned.
  • [0039]
    Flexible implant 30 has a first end 31 a and an opposite second end 31 b. Vertebra V1 includes a first opening H1 in its anterior face and a first tunnel extending therefrom. Vertebra V2 has a second opening H2 in its anterior face and a second tunnel extending therefrom. The ends 31 a and 31 b are inserted into respective ones of the first and second tunnels through openings H1 and H2. An anchor 32 a is inserted through opening H1 and into the tunnel of vertebra V1 to secure end 31 a to vertebrae V1. Similarly, an anchor 32 b is inserted through opening H2 and into the tunnel of vertebra V2 to secure end 31 b to vertebrae V2. Anchors 32 a, 32 b are illustrated as threaded interference screws that are embedded into vertebral bodies V1 and V2 so that they do not protrude from the anterior faces of vertebrae V1 and V2. However, as with the other implants discussed herein, other anchors and anchoring techniques described herein could also be employed with implant 30.
  • [0040]
    Interference anchors 32 a, 32 b can be oriented at an angle ±α with respect to the axial plane P of spinal column that provides a smooth transition for implant 30 as it enters openings H1 and H2 of vertebrae V1 and V2. This reduces stress concentrations at the junction between the implant and the vertebrae. In one embodiment, angle α is about 45 degrees. Other embodiments contemplate angular orientations that range from 0 degrees to about 80 degrees and from about 25 degrees to 65 degrees. As shown in FIG. 3, implant 30 has a reduced lateral width W1 that minimizes the lateral intrusion of implant 30 into the surrounding tissue.
  • [0041]
    The ends of implant 30 and the other implants described herein can be provided with pigtails or other extensions of reduced size for insertion through the openings and tunnels formed in the vertebrae. It is also contemplated that the ends of the implant can include eyelets, holes, loops or other configuration suitable for engagement with an anchor.
  • [0042]
    Referring now to FIG. 2, a spine stabilization system 28′ similar to system 28 includes an implant 30 with opposite ends 31 a and 31 b attached to vertebra V1 and V2, respectively. An artificial disc 38 is placed in disc space D. Implant ends 31 a and 31 b are attached to gull anchors 36 a and 36 b, respectively. Gull anchors 36 a, 36 b are placed through respective ones of openings H1 and H2 and embedded in tunnels formed in vertebrae V1 and V2, respectively, along with the corresponding ends 31 a, 31 b of implant 30. Gull anchors 36 a, 36 b have wings that are pivotable toward their shaft of the anchor during insertion and are pivotable laterally away from the anchor shaft to resist pullout of the anchor from vertebra after insertion therein.
  • [0043]
    Referring now to FIG. 4, another embodiment spine stabilization system 40 is illustrated attached to vertebrae V1 and V2. System 40 includes an implant 41 attached along the anterior faces of vertebrae V1 and V2. Implant 41 has a width W2 for attachment of two anchors to each end of implant 41. The width W2 also provides greater coverage of the annulus tissue surrounding disc space D. Anchors 44 a and 44 b are attached to comers 42 a and 42 b, respectively, of implant 41 to secure it to vertebra V1. Anchors 44 c and 44 d are attached to comers 42 c and 42 d, respectively, of implant 41 to secure it to vertebra V2.
  • [0044]
    Referring now to FIGS. 5-7 there are shown two additional embodiments of a spinal stabilization system attached to vertebrae V1 and V2. In FIG. 5 stabilization system 50 includes an implant 51 extending along the anterior faces of vertebrae V1 and V2. Implant 51 has a first end 52 a attached to vertebra V1 and an opposite second 52 b attached to vertebra V2. Opening H1 opens adjacent to or through the vertebral endplate of vertebra V1, and a first tunnel extends therefrom in vertebra V1 to opening H2 at its anterior face. First end 52 a of implant 51 is placed into opening H1 and through the tunnel and attached to vertebra V1 with anchor 54 a at opening H2. A second tunnel is formed in vertebra V2 between opening H3 adjacent to or through the vertebral endplate of vertebra V2 and opening H4 at its anterior face. Second end 52 b of implant 51 is placed into opening H3 and through the second tunnel and attached to vertebra V2 with anchor 54 b at opening H4.
  • [0045]
    In one embodiment, anchor 54 is a button or flange member that is secured to the ends of implant 51 and abuts against the anterior face of the respective vertebra. As shown in FIG. 7, anchor 54 has a bearing member 56 with a first flange 57 and an opposite second flange 58. Flanges 57, 58 are sized larger than openings H2, H4 and abut against the face of the vertebra around the respective opening in order to secure implant 51 to the vertebra.
  • [0046]
    In one embodiment, attachment loop 59 is attached to bearing member 56 to secure implant 51 thereto. Attachment loop 59 can extend into the tunnel adjacent the respective opening H2, H4. Implant 51 can be looped around attachment loop 59 as shown in FIG. 7, or attachment loop 59 can extend through the body of implant 51 like a suture. It is contemplated that attachment loop 59 can be, for example, a tether, cable, or wire. In another embodiment, not attachment loop is provided, but rather the ends of implant 51 extend through openings or slots provided in respective ones of the anchors 54 a, 54 b and are secured thereto by tying, knotting, looping or otherwise fixing the ends of implant 51 to the adjacent anchor 54 a, 54 b.
  • [0047]
    In FIG. 6 stabilization system 60 includes an implant 61 having a first end 62 a attached to vertebra V1 and an opposite second 62 b attached to vertebra V2. A first tunnel is formed in vertebra V1 between opening H1 at the lower portion of the anterior face of vertebra V1 and opening H2 at the upper portion of the anterior face of vertebra V1. First end 62 a of implant 61 is placed into opening H1 and through the tunnel for attachment to vertebra V1 with anchor 54 a at opening H2. A second tunnel is formed in vertebra V2 between opening H3 at the upper portion of the anterior face of vertebra V2 and opening H4 at the lower portion of the anterior face of vertebra V2. Second end 62 b of implant 61 is placed into opening H3 and through the second tunnel for attachment to vertebra V2 with anchor 54 b at opening H4.
  • [0048]
    It is contemplated that implants 51, 61 or other implants described herein can be provided in multiple segments, of which each segment is attached to a respective one of the vertebrae V1 and V2. The multiple implant segments can be attached to one another adjacent disc space D by suturing, stapling, fusing or otherwise securing the ends of the implant segments together to form a single implant 51, 61. For example, implant 51 includes an upper segment 51 a attachable to vertebra V1 and a lower segment 51 b attachable to vertebra V2. Upper segment 51 a is attached to lower segment 51 b at overlap region 51 c.
  • [0049]
    Referring now to FIG. 8 another embodiment spine stabilization system 70 is attached to vertebrae V1 and V2. System 70 has an implant 71 that extends between vertebrae V1 and V2. Implant 71 has opposite ends 72 a and 72 b that are positioned in notches N1 and N2 formed in the anterior faces of vertebrae V1 and V2, respectively. Implant 71 has first end 72 a attached to vertebra V1 via first anchor 74 a in notch N1. Notch N1 is formed in vertebra V1 to recess the head of anchor 74 a below the anterior face of vertebra V1, minimize or eliminating its protrusion into the adjacent tissue. Anchor 74 a is illustrated in the form of a threaded screw that extends through a spiked washer 76 a. The screw and spikes of washer 76 a extend through end 72 a of implant 71 and into vertebra V1.
  • [0050]
    Implant 71 has opposite second end 72 b attached to vertebra V2 via second anchor 74 b in notch N2. Notch N2 is formed in vertebra V2 to recess the head of anchor 74 b below the anterior face of vertebra V2, minimizing or eliminating its protrusion into the adjacent tissue. Anchor 74 b is illustrated in the form of a threaded screw that extends through a spiked washer 76 b. The screw and spikes of washer 76 b extend through end 72 b and into vertebra V2.
  • [0051]
    Referring now to FIG. 9 another embodiment spine stabilization system 80 is attached to vertebrae V1 and V2 with anchors 74 a, 74 b. Anchors 74 a, 74 b include spiked washers 76 a, 76 b and a bone screw extending therethrough such as discussed above. System 80 has an implant 81 that extends along and is conformable to the anterior faces of vertebrae V1 and V2. Implant 81 has a first end 82 a attached to vertebra V1 via first anchor 74 a. The screw and spikes of washer 76 a extend through end 82 a and into vertebra V1 with the head of anchor 74 a abutting against the anterior face of vertebra V1. Implant 81 has an opposite second end 82 b attached to vertebra V2 via second anchor 74 b. The screw and spikes of washer 76 b extend through end 82 b and into vertebra V2 with the head of anchor 74 b abutting against washer 76 b.
  • [0052]
    In one form, it is contemplated that the surface of washers 76 a, 76 b in contact with the head of the screw extending therethrough is concave to at least partially receive the screw head so that the profile of the screw head above washer 76 a is minimized. In another form, the spiked washers are in the form of staples configured to attach the ends of the implant to the vertebrae without a bone screw.
  • [0053]
    Referring now to FIG. 10, another embodiment spine stabilization system 90 is shown attached to the anterior faces of vertebrae V1 and V2. System 90 has an implant 91 having a first end 92 a and an opposite second end 92 b embedded in vertebrae V1 and V2, respectively. Vertebra V1 has a first opening H1 and a first tunnel extending therefrom into vertebra V1 at an angle +α relative to axial plane P of the spinal column. A second opening H2 having a second tunnel extending therefrom is formed into vertebra V1 at an angle +α relative to axial plane P so that the second tunnel intersects the first tunnel extending from opening H1. First end 92 a is positioned through first opening H1 and into the first tunnel where it is attached to vertebra V1 by a first anchor 94 a.
  • [0054]
    Anchors 94 a, 94 b are illustrated in the form of a pin fastener having a screw thread portion with a pin 95 a extending therefrom. Anchor 94 a is threaded into opening H2 so that pin 95 a extends through second end 92 a to secure implant 91 to vertebra V1. The end of anchor 94 a opposite pin 95 a is provided without a head so that anchor 95 a can be recessed below the anterior face of vertebra V1.
  • [0055]
    Vertebra V2 has a third opening H3 and a third tunnel extending therefrom at an angle −α into vertebra V2. A fourth opening H4 having a fourth tunnel extending therefrom at an angle +α is formed in vertebra V2 so that the fourth tunnel intersects the third tunnel extending from third opening H3. Second end 92 b of implant 91 is positioned through third opening H3 and into the third tunnel where it is attached to vertebra V2 by a second anchor 94 b. Anchor 94 b has a screw thread with a pin 95 b extending therefrom. Anchor 94 b is threaded into opening H4 so that pin 95 b extends through second end 92 b to secure implant 91 to vertebra V2. The end of anchor 94 b opposite pin 95 b is provided without a head so that anchor 95 b can be recessed below the outer surface of vertebra V2.
  • [0056]
    Referring now to FIG. 11, implant 90 is shown with a slightly altered anchoring arrangement as compared to that of FIG. 10. The anchors 96 a, 96 b of FIG. 11 are illustrated in the form of a pin fastener having an exposed head that extends slightly from the anterior face of vertebra V1 and V2, respectively.
  • [0057]
    It is contemplated that the implant 91 of FIGS. 10 and 11 can be provided with eyelet or other opening at each end 92 a, 92 b sized to receive the pin extending distally from the screw thread portion of anchors 94, 96. It is also contemplated that the pins of anchors 94, 96 can extend directly through the implant material at its ends 92 a, 92 b.
  • [0058]
    Referring now to FIG. 12, there is illustrated spine stabilization system 100 attached along the anterior faces of vertebrae V1 and V2. System 100 has an implant 101 with a first end 102 a and opposite second end 102 b. A first tunnel extends from first opening H1 posteriorly into vertebra V1, and second tunnel extends laterally from a second opening H2 formed in the lateral side of vertebra V1 and intersects the first tunnel. First end 102 a extends through opening H1 and into the first tunnel. Anchors 104 a, 104 b are illustrated in the form of a pin fastener. A first anchor 104 a has a screw thread portion with a pin 105 a extending therefrom. First anchor 104 a is placed through second opening H2 so that pin 105 a engages first end 102 a of implant 101.
  • [0059]
    A third tunnel extends from third opening H3 posteriorly into vertebra V2, and a fourth tunnel extends laterally from a fourth opening H4 formed in the lateral side of vertebra V2 and intersects the third tunnel. Second end 102 b extends through opening H3 and into the third tunnel. A second anchor 104 b has a screw thread portion with a pin 105 b extending therefrom. Second anchor 104 b is placed through fourth opening H4 so that pin 105 b engages first end 102 b of implant 101.
  • [0060]
    Referring now to FIG. 13, there is illustrated another embodiment spine stabilization system 110 extending along the anterior faces of vertebrae V1, V2 and having an obliquely oriented attachment arrangement in each of the vertebrae V1, V2. System 110 includes an implant 111 extending between a first end 112 a and a second end 112 b. First opening H1 is formed in the anterior face of vertebra V1 and has a first tunnel extending therefrom that curves obliquely relative to the sagittal plane toward the lateral face of vertebra V1. A second opening H2 is formed in the antero-lateral face of vertebra V1 and has a second tunnel extending therefrom that intersects the first tunnel. Implant 111 has a first end 112 a extending through first opening H1 into the first tunnel. A first anchor 114 a has a screw thread portion with a pin 115 a extending therefrom. Anchor 114 a is placed through opening H2 so that pin 115 a engages first end 112 a of implant 111.
  • [0061]
    Third opening H3 is formed in the anterior face of vertebra V2 and has a first tunnel extending therefrom that curves obliquely relative to the sagittal plane toward the lateral face of vertebra V2. A fourth opening H4 is formed in the antero-lateral face of vertebra V2 and has a fourth tunnel extending therefrom that intersects the third tunnel. Implant 111 has a second end 112 b extending through third opening H3. A second anchor 114 b has a screw thread portion with a pin 115 b extending therefrom. Anchor 114 b is placed through opening H4 so that pin 115 b engages first end 112 b of implant 111.
  • [0062]
    Referring now to FIG. 14 another embodiment spine stabilization system 120 is attached to vertebrae V1 and V2. System 120 has an implant 121 extending along the lateral faces of vertebrae V1 and V2. Vertebra V1 has a first opening H1 in the lateral face of vertebra V1 and a first tunnel extending therefrom. First end 122 a extends through first opening H1 and into the first tunnel where anchor 124 a secures implant 121 to vertebra V1. Vertebra V2 has a second opening H2 in the lateral face of vertebra V2 and a second tunnel extending therefrom. Second end 122 b extends through opening H2 and into the second tunnel where second anchor 124 b secures implant 121 to vertebra V2. Anchors 124 a, 124 b are interference screws embedded in the respective vertebrae V1, V2 and in engagement with respective ones of the ends of implant 121.
  • [0063]
    Referring now to FIG. 15, there is illustrated another embodiment spine stabilization system 130 having an implant 131 extending along the lateral faces of vertebrae V1 and V2. First opening H1 is formed in the lateral face of vertebra V1 and has a first tunnel extending into vertebra V1. A second opening H2 is formed in the anterior face of vertebra V1 and has a second tunnel extending therefrom that intersects the first tunnel. Implant 131 has a first end 132 a extending through first opening H1 and into the first tunnel. A first anchor 134 a in the second tunnel has a screw thread portion with a pin 135 a extending therefrom that engages first end 132 a of implant 131.
  • [0064]
    Third opening H3 is formed in the lateral face of vertebra V2 and has a third tunnel extending therefrom into vertebra V2. A fourth opening H4 is formed in the anterior face of vertebra V2 and has a fourth tunnel extending therefrom that intersects the third tunnel. Implant 131 has a second end 132 b extending through third opening H3 into the third tunnel. A second anchor 134 b in the fourth tunnel has a screw thread portion with a pin 135 b extending therefrom that engages second end 132 b of implant 131.
  • [0065]
    Referring now to FIGS. 16 and 17, further embodiments of spine stabilization systems are illustrated that employ multiple implants attached to vertebra V1 and V2. In FIG. 16 stabilization system 140 includes a first implant 141 offset laterally to a first side of the sagittal plane L, and a second implant 141′ offset to a second side of the sagittal plane L. First and second implants 141, 141′ can be equally spaced the same distance from plane L.
  • [0066]
    First implant 141 has a first end 142 a extending through opening H1 and into a first tunnel formed in vertebra V1. First end 142 a is attached to vertebra V1 with anchor 144 a in the first tunnel. Implant 141 has an opposite second end 142 b extending through opening H3 and into a third tunnel formed in vertebra V2. Second end 142 b is attached to vertebra V2 with anchor 144 b in the third tunnel.
  • [0067]
    Second implant 141′ has a first end 142 a′ extending through opening H2 and into a second tunnel in vertebra V1. First end 142 a′ is attached to vertebra V1 with anchor 144 a′ in the second tunnel. Implant 141′ has an opposite second end 142 b′ extending through opening H4 and into a fourth tunnel in vertebra V2. Second end 142 b′ is attached to vertebra V2 with anchor 144 b′ in the fourth tunnel.
  • [0068]
    In FIG. 17 stabilization system 150 is secured anteriorly to vertebrae V1 and V2. System 150 has a first implant 151 with a first end 152 a extending through opening H1 and into a first tunnel formed in vertebra V1. First end 152 a is attached to vertebra V1 with anchor 154 a in the first tunnel. Implant 151 has an opposite second end 152 b extending across sagittal plane L and through opening H4 and into a fourth tunnel formed in vertebra V2. Second end 152 b is attached to vertebra V2 with anchor 154 b in the fourth tunnel.
  • [0069]
    Stabilization system 150 has a second implant 151′ with a first end 152 a′ extending through opening H2 and into a second tunnel formed in vertebra V1. First end 152 a′ is attached to vertebra V1 with anchor 154 a′ in the second tunnel. Implant 151′ has an opposite second end 152 b′ extending through opening H3 and into a third tunnel formed in vertebra V2. Second end 152 b′ is attached to vertebra V2 with anchor 154 b′ in the third tunnel. Second implant 151 ′ extends obliquely across sagittal plane L, forming an “X” shape with first implant 151. The angle of each implant 151, 151′ relative to the sagittal plane may vary in the range from about 5 degrees to about 86 degrees, from about 20 degrees to about 70 degrees, and from about 30 degrees to about 60 degrees. The criss-crossing of implants 151, 151′ improves the resistance of spinal stabilization system 150 to relative rotation or lateral bending between vertebrae V1 and V2.
  • [0070]
    Referring now to FIG. 18 there is illustrated another embodiment of spinal stabilization system 160 attached to vertebrae V1 and V2. System 160 has an implant 161 bendable or flexible to assume a U-shaped configuration, and is attachable to the anterior, antero-lateral or lateral faces of vertebrae V1 and V2. A curved or non-linear tunnel is formed in vertebra V1 between openings H1 and H2 in the anterior face of vertebra V1. Vertebra V2 has formed therein a first tunnel extending from opening H3, and a second tunnel extending from opening H4. Implant 161 extends through the curved tunnel of vertebra V1, and has a first end 162 a secured in the tunnel extending from opening H3 with first anchor 164 a. Implant 161 has a second end 162 b secured in the tunnel extending from opening H4 with second anchor 164 b.
  • [0071]
    Referring now to FIG. 19 there is illustrated another spinal stabilization system 170 attached to vertebrae V1 and V2. System 170 has an implant 171 bendable or flexible to assume an oval-shaped configuration, and is attachable to the anterior, antero-lateral or lateral faces of vertebrae V1 and V2. A first curved or non-linear tunnel is formed in vertebra V1 between openings H1 and H2 in the anterior face of vertebra V1. A second curved or non-linear tunnel is formed in vertebra V2 between openings H3 and H4 in the anterior face of vertebra V2. Implant 171 extends through the first tunnel of vertebra V1, and has a first end 172 a positioned in the second tunnel of vertebra V2. Implant 171 has a second end 172 b positioned in the second tunnel adjacent to or in overlapping arrangement with first end 172 a. An anchor 174 secures ends 172 a, 172 b in the second tunnel of vertebra V2.
  • [0072]
    Referring now to FIG. 20, there is shown another embodiment stabilization system 180 secured to the posterior portion of the spine. System 180 has an implant 181 that extends between and is attached to the spinous processes SP1 and SP2 of vertebra V1 and V2 with anchors 184 a and 184 b, respectively. Anchors 184 a and 184 b are illustrated as buttons or buckles such as described above with respect to button 54. Tunnels can be drilled through each of the spinous processes SP1, SP2 sized to receive the ends of implant 181 therethrough for attachment to anchors 184 a, 184 b. Alternatively, the tunnels through SP1 and SP2 can be sized to receive an attachment loop or member extending from respective ones of the anchors 184 a, 184 b for engagement of the ends of implant 181 between SP1 and SP2.
  • [0073]
    In FIG. 21, another embodiment posterior spine stabilization system 190 is illustrated. Vertebra V1 includes a first tunnel formed in a pedicle thereof opening at H1 on the pedicle at the posterior portion of the spinal column segment. Vertebra V2 includes a second tunnel formed in or through a pedicle thereof and opening at H2 on the pedicle at the posterior portion of the spinal column segment. System 190 includes an implant 191 extending between and attached to the pedicles P1 and P2 of vertebra V1 and V2. Implant 191 includes a first end 191 a embedded in the first tunnel in vertebra V1 and attached thereto with anchor 194 a. Implant 191 includes a second end 191 b embedded in the second tunnel in vertebra V2 and attached thereto with anchor 194 b. Anchors 194 a and 194 b are illustrated as threaded interference screws. However, other embodiments contemplate the use of other anchors described herein. Other embodiments also contemplate the attachment of posterior spine stabilization devices to the facets, pars, or transverse processes of vertebrae V1 and V2.
  • [0074]
    Referring now to FIG. 22, a posterior view is provided of the posterior portion of the spinal column segment with a spine stabilization system 200 attached thereto along multiple levels. System 200 is similar to system 190 described above, and includes a first implant 201 attached to the pedicles of vertebrae V1 and V3 via anchors 204 a and 204 c, respectively, along one side of the spinous processes. The ends of implants 201 and anchors 204 a, 204 c can be embedded or positioned in tunnels formed in the pedicles of vertebra V1, V3. Spine stabilization system 200 further includes a second implant 200′ attached to the pedicles of vertebrae V1 and V3 via anchors 204 a′ and 204 c′, respectively, along the other side of the spinous processes opposite implant 200. The ends of implant 201′ and anchors 204 a′, 204 c′ can be embedded or positioned in tunnels formed in the pedicles of vertebra V1, V3. Implants 201, 201′ can span across vertebra V2, or can be attached thereto with an anchor extending through or coupled to the implant.
  • [0075]
    The present invention further contemplates surgical methods for attaching a spinal stabilization system to first and second vertebrae. The openings and tunnels can be formed by drilling, tapping, chiseling, punching, or otherwise cutting the vertebral bodies. In the embodiments of the stabilization system employing curved or non-linear tunnels through the vertebrae, it is contemplated that a flexible drill can be used to create these curved tunnels. It is further contemplated that attachment of the stabilization systems could occur before, after or during placement of a device into the disc space between the first and second vertebrae.
  • [0076]
    In one specific application, the stabilization system is used to reconstruct the anterior longitudinal ligament. In one specific surgical technique, the disc space is accessed from an anterior approach and a fusion device, artificial disc or spacer is inserted into the disc space. A first opening and tunnel is formed into the upper vertebral body and a second opening and tunnel is formed into the lower vertebral body. One end of the implant is inserted into either the first or second tunnel, and the implant is attached to the corresponding vertebra with an anchor. The opposite end of the implant is inserted into the other tunnel formed in the other vertebra and attached with an anchor. A desired tension can be applied to the implant before attachment of the other end to the other vertebra. The applied tension may differ depending on whether the device inserted into the disc space is a fusion cages, an artificial disc, or spacer. The other end of the implant is then attached to the other vertebra using a second anchor. The anchors can be embedded in the vertebrae to reduce the profile of the system along the upper and lower vertebrae.
  • [0077]
    While the invention has been illustrated and described in detail in the drawings and foregoing description, the same is to be considered as illustrative and not restrictive in character, it being understood that only the illustrated embodiments have been shown and described, and that all changes and modifications that come within the spirit of the invention are desired to be protected. For example, the spine stabilization system could be employed across multiple vertebral levels. In another example, multiple spine stabilization systems could be employed on the same vertebral level such as across the anterior aspects and the lateral aspects of the same vertebrae.

Claims (24)

  1. 1-38. (canceled)
  2. 39. A method for stabilizing a portion of the spinal column, comprising:
    providing an implant having a first end and an opposite second end;
    forming a tunnel in a first vertebral body;
    placing at least a portion of one the first end and the second end of the implant in the tunnel; and
    attaching the one end of the implant to the first vertebral body.
  3. 40. The method of claim 39, wherein forming the tunnel includes forming the tunnel at an angle relative to the axial plane of the spinal column in the range of 0 degrees to 80 degrees.
  4. 41. The method of claim 39, wherein attaching the one end includes placing at least one anchor in the tunnel in the first vertebral body.
  5. 42. The method of claim 41, further comprising:
    forming a second tunnel in a second vertebral body;
    placing the other of the first end and the second end of the implant in the second tunnel; and
    attaching the other end of the implant in the second tunnel of the second vertebral body.
  6. 43. The method of claim 42, wherein attaching the other end includes placing at least one anchor in the second tunnel in the second vertebral body.
  7. 44. The method of claim 42, wherein the first tunnel and the second tunnel are formed such that the implant extends along the anterior faces of the first vertebral body and the second vertebral body.
  8. 45. The method of claim 42, wherein the first tunnel and the second tunnel are formed such that the implant extends along the lateral faces of the first vertebral body and the second vertebral body.
  9. 46. The method of claim 42, wherein the first tunnel and the second tunnel are formed such that the implant extends along the posterior of the first vertebral body and the second vertebral body.
  10. 47. The method of claim 42, further comprising inserting a device in a spinal disc space between the first vertebral body and the second vertebral body.
  11. 48. The method of claim 39, further comprising:
    forming a second tunnel in the first vertebral body that intersects the tunnel; and
    inserting at least one anchor in the second tunnel to attach the implant.
  12. 49. The method of claim 48, wherein forming the tunnel includes forming the tunnel in communication with the anterior face of the first vertebral body, and forming the second tunnel includes forming the second tunnel in communication with the lateral face of the first vertebral body.
  13. 50. The method of claim 48, wherein forming the tunnel includes forming the tunnel in communication with the anterior face of the first vertebral body, and forming the second tunnel includes forming the second tunnel in communication with the antero-lateral face of the first vertebral body.
  14. 51. The method of claim 48, wherein:
    forming the tunnel includes forming the tunnel in communication with the anterior face of the first vertebral body adjacent one of its endplates and at a first angle relative to the axial plane of the spinal column; and
    forming the second tunnel includes forming the second tunnel in communication with the anterior face of the first vertebral body adjacent the other of its endplates at a second angle relative to the axial plane.
  15. 52. The method of claim 39, wherein:
    forming the tunnel includes forming the tunnel from a first opening adjacent one endplate of the first vertebral body to a second opening adjacent the other endplate of the first vertebral body;
    placing the implant includes placing the one end of the implant through the first opening and the tunnel to the second opening; and
    attaching the one end includes attaching the one end of the implant at the second opening.
  16. 53. The method of claim 52, wherein the first opening extends through the one endplate.
  17. 54. The method of claim 39, further comprising:
    providing a second implant having a first end and an opposite second end;
    forming a second tunnel in the first vertebral body;
    placing at least portion of one of the first end and second end of the second implant into the second tunnel; and
    attaching the one end of the second implant to the first vertebral body.
  18. 55. The method of claim 54, further comprising:
    forming a third tunnel in a second vertebral body;
    placing the other of the first and second ends of the implant in the third tunnel;
    attaching the other end of the implant to the second vertebral body;
    forming a fourth tunnel in the second vertebral body;
    placing the other of the first end and second end of the second implant in the fourth tunnel; and
    attaching the other end of the second implant to the second vertebral body.
  19. 56. The method of claim 55, wherein the first and second implants are attached to the first and second vertebral bodies in a parallel arrangement.
  20. 57. The method of claim 55, wherein the first and second implants are attached to the first and second vertebral bodies in an X-shaped arrangement.
  21. 58. The method of claim 39, further comprising:
    forming a second tunnel formed in the first vertebral body spaced from the tunnel;
    forming a third tunnel in a second vertebral body from a first opening adjacent one endplate of the second vertebral body to a second opening adjacent the one endplate of the second vertebral body;
    placing the implant through the third tunnel;
    placing the other of the first end and second end of the implant into the second tunnel; and
    attaching the other end in the second tunnel to the first vertebral body.
  22. 59. The method of claim 39, wherein:
    forming the tunnel includes forming the tunnel between a first opening adjacent one endplate of the first vertebral body and a second opening adjacent the one endplate of the first vertebral body, and further comprising:
    forming a second tunnel through a second vertebral body from a third opening adjacent one endplate of the second vertebral body to a fourth opening adjacent the one endplate of the second vertebral body;
    placing the implant through the second tunnel;
    placing the one end of the implant into the tunnel through the first opening;
    placing the other of said first and second ends of the implant into the tunnel through the second opening and adjacent the one end of the implant in the first tunnel; and
    attaching the first and second ends to the first vertebral body.
  23. 60. The method of claim 39, further comprising:
    forming a notch in the first vertebral body;
    forming the tunnel includes forming the tunnel in communication with the notch; and
    attaching the one end to the first vertebral body in the notch.
  24. 61-77. (canceled)
US11215853 2001-02-28 2005-08-31 Flexible systems for spinal stabilization and fixation Abandoned US20060009846A1 (en)

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EP1381322A1 (en) 2004-01-21 application
US7229441B2 (en) 2007-06-12 grant
WO2002067793A2 (en) 2002-09-06 application
US20020120270A1 (en) 2002-08-29 application
WO2002067793A3 (en) 2002-11-21 application
CA2439525A1 (en) 2002-09-06 application
JP2004527287A (en) 2004-09-09 application

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