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| 국가/구분 | United States(US) Patent 등록 |
|---|---|
| 국제특허분류(IPC7판) |
|
| 출원번호 | US-0381400 (1995-01-31) |
| 발명자 / 주소 |
|
| 인용정보 | 피인용 횟수 : 872 인용 특허 : 0 |
An expandable intervertebral cage apparatus includes a pair of cage components, each generally in the shape of a half cylinder. Each of the cage components provides a corresponding, abutting conically shaped recess that cooperates with a conical end portion of an expansion screw. One of the cage com
An expandable intervertebral cage apparatus includes a pair of cage components, each generally in the shape of a half cylinder. Each of the cage components provides a corresponding, abutting conically shaped recess that cooperates with a conical end portion of an expansion screw. One of the cage components carries a fitting with an internally threaded bore that receives external threads of the expansion screw. As the expansion screw advances into the cage, the conically shaped end portion of the expansion screw engages the conically shaped recesses on the cage components to expand the two cage components apart until they are in contact with the vertebral plates of adjacent vertebrae. The cage components have passageways for packing with bone-inducing-growth material allowing the cage to become part of a spinal fusion. A surgical method for installing the expandable intervertebral cage is also disclosed.
A bio-compatible intervertebral prosthesis for implantation between adjacent vertebrae comprising: a) a cage body that includes a plurality of components including at least first and second separable cage sections configured and sized to be inserted between adjacent vertebrae; b) said cage sections
A bio-compatible intervertebral prosthesis for implantation between adjacent vertebrae comprising: a) a cage body that includes a plurality of components including at least first and second separable cage sections configured and sized to be inserted between adjacent vertebrae; b) said cage sections being separable along the longitudinal axis of said cage body; c) the cage body having an anterior section with an internally threaded bore; d) the cage body having an internal recess defined by a recess surface; e) the cage body having anterior and posterior end portions; f) An expansion screw with proximal and distal end portions, the proximal end having means thereon for forming a connection with a rotary driver for rotating the screw, the distal end portion being sized and shaped to force the first and second cage sections apart as the screw advances longitudinally within the cage body to engage the recess surface along the length of the distal end of said expansion screw and in a direction from the anterior to the posterior end portions thereof; g) wherein said expansion screw has a length less than the length of the cage body and wherein said expansion screw does not extend beyond the end of said cage body; and h) wherein the first and second cage sections move apart incrementally as the screw advances into the internally threaded bore and recess surface.
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