Method and apparatus for spinal stabilization
A method and apparatus of limiting at least one degree of movement between a superior vertebrae and an inferior vertebrae of a patient includes advancing a distal end of a stabilization device into a pedicle of the inferior vertebrae. A proximal portion of the stabilization device is positioned such that the proximal portion limits at least one degree of movement between a superior vertebrae and an inferior vertebrae by contacting a surface of the superior vertebrae.
1. A spinal stabilization device, comprising:
an elongate body, having a proximal end and a distal end;
a distal anchor on the distal end of the elongate body;
a proximal anchor moveably carried by the elongate body, the proximal anchor having a proximal member defining a proximal stop and a distal member defining a distal stop, wherein an expandable member is positioned between the proximal stop and the distal stop,
wherein the expandable member is configured to expand radially as the proximal stop and distal stop are moved towards each other and the expandable member is compressed therebetween, wherein the proximal anchor and the elongated body include complementary retention structures which allow distal movement of the proximal anchor but resist proximal movement of the proximal anchor.
2. The spinal stabilization device of claim 1 , wherein the expandable member comprises an elastic material.
3. The spinal stabilization device of claim 1 , wherein the expandable member comprises a malleable material.
4. The spinal stabilization device of claim 1 , wherein the expandable member comprises a metal.
5. The spinal stabilization device of claim 1 , wherein the expandable member comprises one or more slots.
6. The spinal stabilization device of claim 1 , wherein the proximal member is configured to be advanced in the distal direction while resisting movement in the proximal direction.
7. The spinal stabilization device of claim 1 , wherein the proximal member comprises threads.
8. The spinal stabilization device of claim 1 , wherein the distal member comprises threads.
9. A spinal stabilization device, comprising:
an elongate body, having a proximal end and a distal end;
a distal anchor on the distal end of the elongate body;
a proximal anchor moveably carried by the elongate body, the proximal anchor having a proximal member defining a proximal flange and a distal member defining a distal flange, wherein an expandable member is positioned between the proximal flange and the distal flange,
wherein the expandable member is configured to expand radially as the proximal flange is moved toward the distal flange and the expandable member is compressed therebetween, wherein the proximal member comprises a recess and a ring.
10. The spinal stabilization device of claim 9 , wherein the ring comprises a series of annular ridges or grooves configured to permit distal travel of the proximal anchor with respect to the elongate body, but resist proximal travel of the proximal anchor with respect to the elongate body.
11. The spinal stabilization device of claim 9 , wherein the ring is a split ring.
12. The spinal stabilization device of claim 9 , wherein the expandable member comprises an elastic material.
13. The spinal stabilization device of claim 9 , wherein the proximal member is configured to be advanced in the distal direction while resisting movement in the proximal direction.
14. The spinal stabilization device of claim 9 , wherein the proximal member comprises threads.
15. A spinal stabilization device, comprising:
an elongate body, having a proximal end and a distal end;
a distal anchor on the distal end of the elongate body;
a proximal anchor moveably carried by the elongate body, the proximal anchor having a proximal member defining a proximal stop and a distal member defining a distal stop, wherein an expandable member is positioned between the proximal stop and the distal stop,
wherein the expandable member is configured to expand radially as the proximal member is moved distally and the expandable member is compressed between the proximal stop and the distal stop, wherein the proximal anchor and the elongated body include complementary retention structures which allow distal movement of the proximal anchor but resist proximal movement of the proximal anchor.
16. The spinal stabilization device of claim 15 , wherein the expandable member comprises an elastic material.
17. The spinal stabilization device of claim 15 , wherein the proximal member comprises threads.