Interspinous implant
An interspinous implant is provided. The interspinous implant can include a first member having a first end and a second end. At least one of the first end and the second end can include a mating portion. The interspinous implant can also include a second member, which can have a first end, a second end and at least one receiving portion formed adjacent to at least one of the first end and the second end. The at least one receiving portion can receive the mating portion to couple the first member to the second member at a desired orientation. The interspinous implant can also include a first extension, which can be substantially opposite the mating portion, and adapted to engage a spinous process. The interspinous implant can comprise a second extension, which can be substantially opposite the at least one receiving portion, and adapted to engage a second process.
1. An interspinous implant having a longitudinal superior-inferior axis, the interspinous implant comprising:
a body having a medial-lateral width and an anterior-posterior depth;
a first bracket connected to the body and extending in the superior direction, the first bracket comprising a first pair of legs that define a first opening extending along a first bracket axis, the first bracket axis extending parallel to the longitudinal superior-inferior axis;
a second bracket connected to the body and extending in the inferior direction, the second bracket comprising a second pair of legs that define a second opening extending along a second bracket axis, the second bracket axis extending parallel to the longitudinal superior-inferior axis;
a first channel defined by the interspinous implant between the first pair of legs; and
a second channel defined by the interspinous implant between the second pair of legs, the first and second channels extend parallel to one another in an anterior-posterior direction and oblique to the longitudinal superior-inferior axis along at least portions of respective lengths thereof;
wherein the second pair of legs are spaced to directly engage a spinous process of a vertebra by having a spacing that approximates a width of the spinous process;
wherein the second bracket includes flanges extending laterally from the second pair of legs to directly engage a lamina of the vertebra adjacent the spinous process, the flanges having a length sufficient to support the lamina;
wherein the first bracket and the second bracket are offset in the anterior-posterior direction such that the first bracket axis and the second bracket axis are not coaxial; and
wherein the second pair of legs is configured to engage an anterior portion of the spinous process of the vertebra and the first pair of legs is configured to support a posterior portion of an additional spinous process of an additional vertebra superior of the vertebra engaged by the second pair of legs when the second bracket is engaged with the lamina of the vertebra adjacent the spinous process.
2. The interspinous implant of claim 1 , wherein each leg of the second bracket has an inner surface with a variable distance from the longitudinal superior-inferior axis.
3. The interspinous implant of claim 2 , wherein each inner surface comprises a curved inner surface that is shaped such that each leg of the second bracket has a thickness increasing away from the body.
4. The interspinous implant of claim 1 , wherein the first bracket and the second bracket are offset such that the first bracket axis is advanced in the anterior direction relative to the second bracket axis relative to an anterior-posterior center of the interspinous implant.
5. The interspinous implant of claim 4 , wherein anterior surfaces of the flanges have an anterior-posterior slope.
6. The interspinous implant of claim 1 , wherein each leg includes anti-slip formations.
7. The interspinous implant of claim 6 , wherein the anti-slip formations comprise sagittal teeth.
8. The interspinous implant of claim 6 , wherein the anti-slip formations are located on the flanges.
9. The interspinous implant of claim 1 , wherein each flange includes a hole.
10. The interspinous implant of claim 1 , wherein the body includes a medial-lateral recess.
11. The interspinous implant of claim 1 , further comprising a channel extending into at least one of the medial and lateral sides of the body.
12. The interspinous implant of claim 1 , wherein the second pair of legs includes inner surfaces that are disposed to be parallel relative to a medial sagittal plane of the interspinous implant.
13. The interspinous implant of claim 1 , wherein the flanges include inner surfaces that are continuous with the inner surfaces of the second pair of legs, respectively, to directly engage the lamina immediately adjacent the spinous process.
14. The interspinous implant of claim 1 , further comprising:
an intermediate portion of the body extending from the first pair of legs to the second pair of legs to join the first and the second pairs of legs together in an offset relationship, the intermediate portion being between the first and the second pairs of legs to define a wall of each one of the first and the second brackets, and including a first thickness that is greater than both a second thickness of the first pair of legs and a third thickness of the second pair of legs as measured along a transverse axis extending across the intermediate portion from the first pair of legs to the second pair of legs.
15. The interspinous implant of claim 1 , wherein the second pair of legs is configured to extend inferiorly past the spinous process of the vertebra.