Multilock anterior cervical plating system
View Patent ↗Anatomically contoured anterior cervical plates with bone ingrowth surfaces, providing for intersegmental compressive preloading, and a rigid and locked interface to all of the bone screws, with those engaging the vertebrae deployed in highly convergent pairs. The bone screws have a tapered self-tapping leading end, an increasing root diameter with a generally constant outer diameter with a thread that is narrow and sharp throughout and an enlarged head portion capable of an interference fit to the receiving holes of the plate. Instrumentation consists of plate holders, a compression apparatus and a pilot hole forming device that interlocks with the plate. Methods for spinal compression and bone hole preparation are provided.
1. A plate system adapted for application to the anterior human cervical spine and for contacting at least a portion of the anterior aspects of at least two cervical vertebral bodies, said plate system comprising:
a plate having a longitudinal axis and a length sufficient to span a disc space and overlap portions of at least two adjacent cervical vertebral bodies, said plate having a lower surface for placement against the vertebral bodies and an upper surface opposite said lower surface, said lower surface being concave along a substantial portion of the longitudinal axis of said plate;
at least two bone screw receiving holes extending through said plate from said upper surface through said lower surface, each of said bone screw receiving holes having a central longitudinal axis and being adapted to receive a bone screw to attach for engaging said plate to the cervical spine; and
a lock adapted to overlie at least a portion of said at least two bone screw receiving holes, said lock having an elongated segment having a width, a length longer than said width, and a surface adapted to bear against said plate, said lock being adapted to engage said plate and being adapted to retain at least two bone screws to said plate when said length of said elongated segment is generally transverse to the longitudinal axis of said plate.
2. The plate of claim 1 , wherein said lock further comprises a shaft member for attaching said lock to said plate.
3. The plate system of claim 1 , wherein said plate includes a recess configured to receive at least a portion of a perimeter of said elongated segment.
4. The plate system of claim 1 , wherein at least two of said bone screw receiving holes lie along a line transverse to the longitudinal axis of said plate to overlie one of the cervical vertebral bodies.
5. The plate system of claim 1 , wherein at least a portion of said lower surface of said plate is other than smooth.
6. The plate system of claim 1 , further comprising at least a third bone screw receiving hole, said lock being configured to cover at least three of said bone screw receiving holes.
7. The plate system of claim 6 , further comprising at least a fourth bone screw receiving hole, said lock being configured to cover at least four of said bone screw receiving holes.
8. The plate system of claim 1 , wherein said lock is adapted to be rotated into unlocked position.
9. The plate system of claim 1 , in combination with at least two bone screws each having a central longitudinal axis and being adapted to engage each of the at least two vertebral bodies, respectively, each of said bone screws having a leading end for insertion into the vertebral bodies and a trailing end opposite said leading end.
10. The plate system of claim 9 , comprising at least in part of a bioresorbable material.
11. The plate system of claim 1 , wherein at least a first pair of said bone screw receiving holes is transversely oriented side-by-side in said plate to overlie the anterior aspect of a cervical vertebral body, said lock being adapted to cover at least in part a portion of each of said transversely oriented side-by-side bone screw receiving holes.
12. The plate system of claim 1 , in combination with an interbody implant.
13. The plate system of claim 1 , in combination with a bone graft.
14. The plate system of claim 1 , in combination with a bone growth promoting material.
15. The plate system of claim 14 , wherein said bone growth promoting material is at least in part other than bone.
16. The plate system of claim 14 , wherein said bone growth promoting material is at least in part bone.
17. The plate system of claim 14 , wherein said bone growth promoting material includes at least one of bone morphogenetic protein, hydroxyapatite, and hydroxyapatite tricalcium phosphate.
18. The plate system of claim 1 , wherein at least a portion of said lower surface of said plate comprises a bone ingrowth material.
19. The plate system of claim 1 , wherein at least a portion of said lower surface of said plate includes a bone ingrowth surface.
20. The plate system of claim 1 , wherein at least a portion of one of said plate and said lock is a bioresorbable material.
21. A plate system adapted for application to the anterior human cervical spine and for contacting at least a portion of the anterior aspects of at least two cervical vertebral bodies, said plate system comprising:
a plate having a longitudinal axis and a length sufficient to span a disc space and overlap portions of at least two adjacent cervical vertebral bodies, said plate having a lower surface for placement against the vertebral bodies and an upper surface opposite said lower surface, said lower surface being concave along a substantial portion of the longitudinal axis of said plate, said plate having a recess;
at least two bone screw receiving holes extending through said plate from said upper surface through said lower surface, each of said bone screw receiving holes having a central longitudinal axis and being adapted to receive a bone screw to attach for engaging said plate to the cervical spine; and
a lock for locking at least two bone screws inserted in said at least two bone screw receiving holes, respectively, said lock being at least in part other than a screw, said lock having a central opening, at least a portion of a perimeter of said lock being receives in said recess.
22. The plate system of claim 21 , wherein at least two of said bone screw receiving holes lie along a line transverse to the longitudinal axis of said plate to overlie one of the cervical vertebral bodies.
23. The plate system of claim 21 , wherein at least a portion of said lower surface of said plate is other than smooth.
24. The plate system of claim 21 , wherein said lock is removably coupled to said plate.
25. The plate system of claim 21 , further comprising at least a third bone screw receiving hole, said lock being configured to cover at least three of said bone screw receiving holes.
26. The plate system of claim 25 , further comprising at least a fourth bone screw receiving hole, said lock being configured to cover at least four of said bone screw receiving holes.
27. The plate system of claim 21 , wherein said lock comprises a thread adapted to comparatively engaged said plate.
28. The plate system of claim 21 , in combination with at least two bone screws each having a central longitudinal axis and being adapted to engage each of the at least two vertebral bodies, respectively, each of said bone screws having a leading end for insertion into the vertebral bodies and a trailing end opposite said leading end.
29. The plate system of claim 28 , comprising at least in part of a bioresorbable material.
30. The plate system of claim 21 , wherein at least a first pair of said bone screw receiving holes is transversely oriented side-by-side in said plate to overlie the anterior aspect of a cervical vertebral body, said lock being adapted to cover at least in part a portion of each of said transversely oriented side-by-side bone screw receiving holes.
31. The plate system of claim 21 , in combination with an interbody implant.
32. The plate system of claim 21 , in combination with a bone graft.
33. The plate system of claim 21 , in combination with a bone growth promoting material.
34. The plate system of claim 33 , wherein said bone growth promoting material is at least in part other than bone.
35. The plate system of claim 33 , wherein said bone growth promoting material is at least in part bone.
36. The plate system of claim 33 , wherein said bone growth promoting material includes at least one of bone morphogenetic protein, hydroxyapatite, and hydroxyapatite tricalcium phosphate.
37. The plate system of claim 21 , wherein at least a portion of said lower surface of said plate comprises a bone ingrowth material.
38. The plate system of claim 21 , wherein at least a portion of said lower surface of said plate includes a bone ingrowth surface.
39. The plate system of claim 21 , wherein at least a portion of one of said plate and said lock is a bioresorbable material.