Systems and method in accordance with the embodiments of the present invention can include an implant for positioning within a cervical facet joint for distracting the cervical spine, thereby increasing the area of the canals and openings through which the spinal cord and nerves must pass, and decre
Systems and method in accordance with the embodiments of the present invention can include an implant for positioning within a cervical facet joint for distracting the cervical spine, thereby increasing the area of the canals and openings through which the spinal cord and nerves must pass, and decreasing pressure on the spinal cord and/or nerve roots. The implant can be inserted laterally or posteriorly.
대표청구항▼
1. An apparatus for sizing a facet joint in order to select a facet joint implant for implanting in the facet joint, the apparatus comprising: a handle;an interfacet sizer having a proximal end and a distal end with an upper concave surface and an opposing lower convex surface extending from the pro
1. An apparatus for sizing a facet joint in order to select a facet joint implant for implanting in the facet joint, the apparatus comprising: a handle;an interfacet sizer having a proximal end and a distal end with an upper concave surface and an opposing lower convex surface extending from the proximal end to the distal end, the upper convex surface and lower convex surface tapering toward each other and having a rounded distal end, the interfacet sizer connected with the handle at the proximal end; anda stop extending from the concave surface at the proximal end of the interfacet sizer, the stop adapted to prevent over-insertion of the interfacet sizer during sizing,wherein the interfacet sizer is angled obliquely from a longitudinal axis of the handle and sized to fit between an inferior facet of an upper vertebra of the facet joint and a superior facet of a lower vertebra of the facet joint. 2. The apparatus of claim 1, wherein the distal end of the interfacet sizer has a distal tip, and wherein the stop extends a first distance from the longitudinal axis and the distal tip extends a second distance from the longitudinal axis, the second distance being greater than the first distance. 3. The apparatus of claim 1, wherein the stop includes a substantially planar surface extending substantially perpendicular to the concave surface of the interfacet sizer, the substantially planar surface arranged to abut one of the upper and lower vertebras to prevent over insertion of the interfacet sizer during sizing. 4. The apparatus of claim 3, wherein the handle includes a neck portion, the neck portion tapering towards the interfacet sizer and the interfacet sizer connected to the neck portion. 5. The apparatus of claim 4, wherein the stop includes a tapered portion extending from the substantially planar surface towards the neck portion. 6. The apparatus of claim 1, wherein the handle includes a substantially cylindrical portion having a radius extending from the longitudinal axis that defines a cylindrical boundary coincident with the cylindrical portion and extending along the longitudinal axis, and wherein the interfacet sizer is disposed within the boundary. 7. An apparatus for sizing a facet joint in order to select a facet joint implant for implanting in the facet joint, the apparatus comprising: a cylindrical handle member extending along a longitudinal axis and having a proximal end and a distal end, the cylindrical handle member having a radius extending from the longitudinal axis that defines a cylindrical boundary coincident with the cylindrical handle member and extending along the longitudinal axis;a neck member extending from the distal end of the cylindrical handle member, the neck member having a proximal end, a middle portion, and a distal end with an exterior surface tapering from the proximal end towards the middle portion of the neck member, the proximal end, the middle portion, and the distal end each having a different width;an interfacet sizer having a proximal end extending from the distal end of the neck member and having an opposing rounded, tapered distal end to facilitate insertion of the interfacet sizer into the facet joint, the interfacet sizer having an upper concave surface and an opposing lower convex surface extending from the proximal end to the distal end of the interfacet sizer, the upper convex surface and lower convex surface tapering toward each other to form the rounded, tapered distal end, wherein the interfacet sizer is disposed within the boundary; anda stop disposed at the proximal end of the interfacet sizer, the stop including a first portion having a substantially planar surface extending substantially perpendicular to the concave surface of the interfacet sizer, the stop adapted to prevent over-insertion of the tool during sizing and including a second portion extending from the substantially planar surface and tapering towards the distal end of the neck portion. 8. The apparatus of claim 7, wherein the distal end of the interfacet sizer has a distal tip, and wherein the stop extends a first distance from the longitudinal axis and the distal tip extends a second distance from the longitudinal axis, the second distance being greater than the first distance. 9. The apparatus of claim 7, wherein the proximal end of the neck member has a first width,wherein the middle portion of the neck member has a second width,wherein the distal end of the neck member has a third width,wherein the first width is greater than the second width and the third width is greater than the second width. 10. The apparatus of claim 7, wherein the handle has a handle thickness extending along the longitudinal axis and the interfacet sizer has a sizer thickness, the handle thickness being greater than the sizer thickness. 11. The apparatus of claim 7, wherein the substantially planar surface extends along an entire width of the proximal end of the interfacet sizer. 12. The apparatus of claim 7, wherein the stop has a pair of opposing substantially planar sidewall surfaces extending between the first portion and the second portion. 13. The apparatus of claim 12, wherein the interfacet sizer has a pair of opposing substantially planar sidewall surfaces extending between the upper convex surface and the lower convex surface, and wherein the pair of opposing substantially planar sidewall surfaces of the stop are, respectively, substantially coplanar with the pair of opposing substantially planar sidewall surfaces of the interfacet sizer. 14. The apparatus of claim 7, wherein the exterior surface of the neck member includes an upper surface and opposing lower surface extending from the proximal end to the distal end of the neck member, and wherein the convex surface of the interfacet spacer forms a continuous surface with the lower surface of the neck member. 15. The apparatus of claim 14, wherein the lower surface of the proximal end of the neck member extends a third distance from the longitudinal axis and the lower surface of the middle portion extends a fourth distance from the longitudinal axis, the third distance being greater than the fourth distance. 16. An apparatus for sizing a facet joint in order to select a facet joint implant for implanting in the facet joint, the apparatus comprising: a cylindrical handle member extending along a longitudinal axis and having a proximal end and a distal end, the cylindrical handle member having a radius extending from the longitudinal axis that defines a cylindrical boundary coincident with the cylindrical handle member and extending along the longitudinal axis;a tapering neck member extending from the distal end of the cylindrical handle member;an interfacet sizer having a proximal end extending from the tapering neck member and having an opposing rounded, tapered distal end to facilitate insertion of the interfacet sizer into the facet joint, the interfacet sizer having an upper concave surface and an opposing lower convex surface extending from the proximal end to the distal end of the interfacet sizer,a stop extending from the proximal end of the interfacet sizer, the stop includes a first portion having a substantially planar surface extending substantially perpendicular to the concave surface of the interfacet sizer adapted to prevent over-insertion of the tool during sizing and a second portion extending from the substantially planar surface and tapering towards the tapering neck portion. 17. The apparatus of claim 16, wherein the tapering neck member has a proximal end, a middle portion, and a distal end with an exterior surface tapering from the proximal end towards the middle portion of the neck member, wherein the proximal end of the neck member has a first width,wherein the middle portion of the neck member has a second width,wherein the distal end of the neck member has a third width,wherein the first width is greater than the second width and the third width is greater than the second width. 18. The apparatus of claim 17, wherein the exterior surface of the neck member includes an upper surface and opposing lower surface extending from the proximal end to the distal end of the neck member, and wherein the convex surface of the interfacet spacer forms a continuous surface with the lower surface of the neck member. 19. The apparatus of claim 17, wherein the interfacet spacer has a fourth width and the fourth width is greater than the second width of the middle portion of the neck member. 20. The apparatus of claim 16, wherein the stop has a pair of opposing substantially planar sidewall surfaces extending between the first portion and the second portion, wherein the interfacet sizer has a pair of opposing substantially planar sidewall surfaces extending between the upper convex surface and the lower convex surface, andwherein the pair of opposing substantially planar sidewall surfaces of the stop are, respectively, substantially coplanar with the pair of opposing substantially planar sidewall surfaces of the interfacet sizer.
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