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Kafe 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
|
출원번호 | US-0959200 (2010-12-02) |
등록번호 | US-8257397 (2012-09-04) |
발명자 / 주소 |
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 | 피인용 횟수 : 10 인용 특허 : 462 |
A bone anchor comprising a self-centering ball-joint suitable for use in a spine stabilization prosthesis which supports the spine while providing for the preservation of spinal motion. The bone anchor has a deflectable ball-rod partially received in a socket of a housing formed in the head of the b
A bone anchor comprising a self-centering ball-joint suitable for use in a spine stabilization prosthesis which supports the spine while providing for the preservation of spinal motion. The bone anchor has a deflectable ball-rod partially received in a socket of a housing formed in the head of the bone anchor. A centering rod received partially in the ball-rod and partially within the housing operates to align the ball-rod with the longitudinal axis of the bone anchor. Deflection of the ball-rod bends the centering rod which in turn applies a restoring force upon the ball-rod.
1. A spinal stabilization device comprising: a centering rod having a first end, a second end and a flexible section connecting the first end and the second end;a ball-rod including at least a partial ball-shaped retainer and a rod;a first bore extending along a longitudinal axis of the ball-rod and
1. A spinal stabilization device comprising: a centering rod having a first end, a second end and a flexible section connecting the first end and the second end;a ball-rod including at least a partial ball-shaped retainer and a rod;a first bore extending along a longitudinal axis of the ball-rod and opening through the ball-shaped retainer opposite the rod, wherein the first end of the centering rod is received in the first bore;a housing;a socket within the housing, wherein the socket partially encloses the ball-shaped retainer to form a ball-joint;a channel extending from the socket out of the housing, wherein the rod of the ball-rod extends through the channel out of the housing; anda second bore in the housing extending from the socket opposite the channel, wherein the second end of the centering rod is received in the second bore;whereby deflection of the ball-rod bends the flexible section of the centering rod and the centering rod exerts a restoring force to center the rod of the ball-rod within the channel. 2. The spine stabilization device of claim 1, wherein the channel comprises a frusto-conical surface positioned to contact the rod after a predetermined amount of deflection of the rod from center of the channel. 3. The spine stabilization device of claim 1, wherein said rod and said ball-shaped retainer are made in one piece. 4. The spine stabilization device of claim 1, wherein said housing further comprises a threaded bone anchor. 5. The spine stabilization device of claim 1, wherein said housing further comprises a coupling adapted to connect a spinal implant component to the housing. 6. The spine stabilization device of claim 1, wherein said ball-rod also includes a threaded mount external to the housing adapted to connect a spinal implant to the ball-rod component. 7. The spine stabilization device of claim 1, wherein said ball-rod is made of cobalt chrome alloy. 8. The spine stabilization device of claim 1, wherein said centering rod is made of a super-elastic metal. 9. The spine stabilization device of claim 1, wherein said centering rod is made of nitinol. 10. The spine stabilization device of claim 1, wherein the first bore further comprises an enlarged portion within the ball-shaped retainer, wherein the flexible section of the centering rod is received in the enlarged portion of the first bore. 11. A spine stabilization device comprising: a first element;a second element; anda self-centering joint connecting the first element and the second element;wherein said self-centering joint is a self-centering ball-joint andwherein the self-centering ball-joint comprises:a housing having a socket;a ball-rod received in the socket; anda centering rod received at least partially within the ball-rod and at least partially within the housing;whereby deflection of the ball-rod bends the centering rod and the centering rod exerts a restoring force on the ball-rod. 12. The spine stabilization device of claim 11, wherein said self-centering ball-joint comprises a limit surface positioned to constrain movement of the self-centering ball-joint. 13. The spine stabilization device of claim 11, wherein the first element is a bone anchor. 14. The spine stabilization device of claim 11, wherein the second element is a threaded mount adapted to connect to a spinal implant component. 15. A spinal rod comprising; a rod having a longitudinal axis;a rod-end comprising an aperture adapted to be secured to a bone anchor;and a set screw;wherein the rod-end is connected to the rod by a joint which permits the rod-end to, at least one of, slide along the longitudinal axis of the rod, and rotate around the longitudinal axis of the rod;and wherein the set screw is configured to apply a force to the rod to lock the rod relative to the rod-end. 16. The spinal rod of claim 15, further comprising; a socket in the rod-end;at least a partial ball positioned within the socket;wherein the aperture is located through the partial ball such that a bone anchor secured to the partial ball can pivot and rotate relative to the socket. 17. The spinal rod of claim 15, wherein the rod-end comprises a substantially cylindrical bore in which a first end of the rod is received. 18. The spinal rod of claim 17, wherein: the first end of the rod comprises a circumferential groove; andwherein the rod-end comprises a pin positioned to engage the circumferential groove to prevent removal of the first-end of the rod from the substantially cylindrical bore.
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