Spinal stabilization implant system

• US 5,397,363 A
• Filed: 08/11/1992
• Issued: 03/14/1995
• Est. Priority Date: 08/11/1992
• Status: Expired due to Term

• Current Assignee: Steven D. Gelbard
• Original Assignee: Steven D. Gelbard
• Inventors: Gelbard, Steven D.
• Primary Examiner(s): Green, Randall L.
• Assistant Examiner(s): Nguyen, Dinh X.
• Application Number:
  US07/928,263
• Time in Patent Office: 945 Days
• Field of Search: 623/17, 606/60, 606/61, 606/72, 606/73
• US Class Current: 606/250
• CPC Class Codes: A61B 17/7032 Screws or hooks with U-shaped head or back through which longitudinal rods pass
• CPC Class Codes: A61B 17/7049 Connectors, not bearing on the vertebrae, for linking longitudinal elements together A61B17/7055, A61B17/7053, A61B17/7019 take precedence
• CPC Class Codes: A61B 17/7058 Plates mounted on top of bone anchor heads or shoulders
• CPC Class Codes: A61B 17/7059 Cortical plates A61B17/7007, A61B17/7058 take precedence
• CPC Class Codes: A61B 17/8042 the additional component being a cover over the screw head

Abstract

A surgical implant system for the stabilization of a human spine by fixation of the vertebra utilizing a stabilization cross-link spinal implant system. The system utilizes self-tapping screws having bifurcated protruding members to support an alignment rod, the protruding members available for placement of a fixed or variable traverse cross-link member that couples to the protruding members by use of threaded nuts corresponding to the threaded portion of the outer surface of the protruding members. The externally threaded coupling method can also be used for pedicle, caudal, cranial, thoracic and the like hooks. Also shown is a two plate system for anterior cervical spine fixation.

Claims

1. A surgical implant system for the stabilization of a human spine by fixation of vertebra, said system comprising:

a first screw formed from a shank having a first end and a second end, said first end having a relatively coarse self-tapping thread over a predetermined length of said first end, said second end having at least two spaced apart protruding members extending obliquely therefrom, said protruding members defining an inner surface saddle shaped and configured for receipt of at least one rod therein, said surface saddle having at least one outer threaded surface;

means for connecting said first screw to a second screw and being directly engaged to said first screw and said second screw, said second screw having a first end and a second end, said first end having a relatively coarse self-tapping thread over a predetermined length of said first end, said second end having at least two spaced apart protruding members extending obliquely therefrom, said protruding members defining an inner surface saddle shaped and configured for receipt of at least one rod therein, said surface saddle having at least one outer threaded surface;

at least one nut having an internal thread engageable with said threads formed on said outer surface of said protruding member for rigidly coupling said means for connecting to either said first screw or said second screw;

wherein said first screw and said second screw are each configured and adapted to be inserted into bone structure of a human spinal column whereby placing a rod within the saddle of a first screw and the saddle of a second screw allows for the stabilization of a human spine in a fixed position upon securing said rod in said saddles upon attachment of said nut.

2. The surgical implant system according to claim 1 wherein said saddle surface is receptive to a conventional alignment support rod for positioning along the length of the vertebra of the spine.

3. The surgical implant system according to claim 1 wherein said means for connecting is further defined as a rectangular shaped rigid plate having two ends and two edges with two surfaces therebetween, at least one opening disposed at each end of said plate operatively associated with said protruding members of said screw whereby a first metal screw is rigidly connected to a second screw by placement of said plate over said protruding members and attachment of said metal nuts to said threaded surface of said protruding member.

4. The surgical implant system according to claim 3 wherein said slots disposed in each end of said plate includes a means for rotating said slots in radial relation to said plate.

5. The surgical implant system according to claim 3 wherein said plate has four openings placed therethrough operatively associated with four spaced apart protruding members of a screw for coupling a first screw to a second screw.

6. The surgical implant system according to claim 5 wherein said openings of said plate includes a means for rotation.

7. The surgical implant system according to claim 1 wherein said second end of said screw includes four spaced apart protruding members, each protruding member having an inner surface and an outer surface, said inner surfaces providing an enlarged U-shaped saddle for receiving a receiving a rod in a longitudinal or horizontal position, said outer surface having threads formed thereon providing attachment to a nut for rigidly coupling said rod in said longitudinal or horizontal position to said saddle.

8. A surgical implant system for the stabilization of a human spine by fixation of the vertebra, said system comprising:

at least two screws with each said screw formed from a shank having a first end and a second end, said first end having a relatively coarse self-tapping thread over a major portion of its length, said second end having spaced apart protruding members defining a U-shaped saddle having inner surface and an outer surface, said inner surface available for receipt of an alignment rod, said outer surface having threads formed thereon;

an alignment rod;

a horizontally disposed support member having two ends and two edges forming two side surfaces therebetween with slots disposed at a first end for insertion of said protruding members of a first screw and slots disposed in a second end for insertion of said protruding members of a sagittal placed second screw;

at least two metal nuts having an internal thread engageable with said threaded surface of said protruding members;

wherein said first and second screws are configured and adapted to be inserted into bone structure of a human spinal column along the longitudinal length or horizontal width of a human spine whereby placement of said alignment rod along longitudinally disposed screws provides spine fixation in the longitudinal format and placement of said plate between horizontal disposed screws relative to the human spine provides fixation of the spine across the spinal cord.

9. The surgical implant system according to claim 8 wherein said saddle surface is receptive to a perpendicularly placed alignment support rod placed along a length of the vertebra.

10. The surgical implant system according to claim 8 wherein said slots disposed in the first end of said horizontally disposed support member includes a means for rotating said two slots in radial relation to said support member.

11. The surgical implant system according to claim 8 wherein said slots disposed in the second end of said horizontally disposed support member includes a means for rotating said two slots in radial relation to said support member.

12. The surgical implant system according to claim 8 including a means for spacing said traverse support member a predetermined distance from said saddle surface.

13. The surgical implant system according to claim 12 wherein said means for spacing is defined as a washer having an elongated slot for disposition over the protruding members of said screw allowing for placement on a top surface of an alignment support rod placed therein.