Anterior impacted bone graft and driver instruments

• US 6,984,245 B2
• Filed: 08/06/2002
• Issued: 01/10/2006
• Est. Priority Date: 02/22/2000
• Status: Expired due to Term

• Current Assignee: RTI Surgical Incorporated
• Original Assignee: SDGI Holdings Incorporated (Medtronic Plc)
• Inventors: Lange, Eric C., DeRidder, Steven D., McGahan, Thomas V., Buskirk, Dayna
• Primary Examiner(s): Willse, David H.
• Assistant Examiner(s): Blanco, Javier G.
• Application Number:
  US10/213,328
• Publication Number:
  US 20030130737A1
• Time in Patent Office: 1,253 Days
• Field of Search: 623 1711- 1716, 606/61
• US Class Current: 623/17.11
• CPC Class Codes: A61F 2/28 Bones joints A61F2/30
• CPC Class Codes: A61F 2/442 Intervertebral or spinal discs, e.g. resilient non-disc-shaped intervertebral inflatable pockets A61F2/441; non-disc-shaped intervertebral fusion implants A61F2/4455
• CPC Class Codes: A61F 2/4465 having a circular or kidney shaped cross-section substantially perpendicular to the axis of the spine
• CPC Class Codes: A61F 2/4611 of spinal prostheses
• CPC Class Codes: A61F 2002/2839 Bone plugs or bone graft dowels
• CPC Class Codes: A61F 2002/3023 wedge-shaped cylinders
• CPC Class Codes: A61F 2002/30593 hollow
• CPC Class Codes: A61F 2002/30774 internally-threaded
• CPC Class Codes: A61F 2002/30787 inclined obliquely with respect to each other
• CPC Class Codes: A61F 2002/30879 Ribs
• CPC Class Codes: A61F 2002/30892 parallel
• CPC Class Codes: A61F 2002/30904 serrated profile, i.e. saw-toothed
• CPC Class Codes: A61F 2002/4627 with linear motion along or rotating motion about the instrument axis or the implantation direction, e.g. telescopic, along a guiding rod, screwing inside the instrument
• CPC Class Codes: A61F 2230/0069 cylindrical
• CPC Class Codes: A61F 2310/00017 Iron- or Fe-based alloys, e.g. stainless steel
• CPC Class Codes: A61F 2310/00023 Titanium or titanium-based alloys, e.g. Ti-Ni alloys
• CPC Class Codes: A61F 2310/00179 Ceramics or ceramic-like structures
• CPC Class Codes: A61F 2310/00359 Bone or bony tissue

Abstract

Instrument and implants are disclosed which provide for insertion of an implant into an intervertebral disc space from multiple approaches to the spine. Specifically, as a preferred aspect of the invention the implant includes a tapered portion and the implant may be inserted from multiple approaches to the spine with the orientation and taper properly oriented in the disc space regardless of the approach.

Claims

1. A spinal implant, comprising:

an implant body having

a first pair of substantially parallel sidewalls, and

a second pair of substantially parallel sidewalls disposed at an oblique angle with respect to said first pair of sidewalls to permit insertion of said implant body into a disc space from multiple directions; and

wherein said implant body defines a first insertion tool bore and a second insertion tool bore, said first tool bore extending substantially parallel to said first pair of sidewalls, said second tool bore extending substantially parallel to said second pair of sidewalls.

2. The implant of claim 1, wherein said first insertion tool bore is threaded.

3. The implant of claim 2, wherein said second insertion tool bore is threaded.

4. The implant of claim 3, wherein said implant body defines a third bore parallelly spaced apart from said first insertion tool bore, said third bore being adapted to receive a pin to minimize implant rotation.

5. The implant of claim 4, wherein said implant body further includes a front end face and an opposing end face oriented in a substantially parallel arrangement, wherein said front end face and said opposing end face extend substantially perpendicular with respect to said first pair of sidewalls.

6. The implant of claim 5, wherein said implant body has an upper bone engaging surface and a lower bone engaging surface, said upper and lower bone engaging surfaces each have a plurality of ridges defined thereon to minimize implant migration.

7. The implant of claim 6, wherein said implant body is tapered.

8. The implant of claim 7, wherein said implant body defines a central opening.

9. The implant of claim 8, wherein said implant body is formed of bone having a medullary canal, and said central opening conforms generally to the medullary canal.

10. The implant of claim 9, wherein a distance between said first pair of substantially parallel sidewalls is substantially identical to a distance between said second pair of substantially parallel sidewalls.

11. The implant of claim 10, wherein said second pair of sidewalls are disposed at angle of approximately 30 degrees with respect to said first pair of sidewalls.

12. The implant of claim 3, wherein:

said implant body further includes an angled driving wall in which said second insertion tool bore is defined; and

said angled driving wall defines a recess surface that extends substantially perpendicular with respect to said second pair of sidewalls.

13. The implant of claim 12, wherein said implant body is made of bone.

14. The implant of claim 13, wherein:

said bone includes a medullary canal; and

said implant body defines a central opening that conforms generally to said medullary canal.

15. The implant of claim 12, wherein a portion of said implant body includes an unmachined donor implant bone portion.

16. The implant of claim 1, wherein said implant body is constructed and arranged to permit insertion of said implant body into the disc space at least from a direct approach and from an oblique approach.

17. The implant of claim 1, wherein a distance between said first pair of sidewalls is substantially identical to a distance between said second pair of sidewalls.

18. The implant of claim 1, wherein said second pair of sidewalls are disposed at angle of approximately 30 degrees with respect to said first pair of sidewalls.

19. The implant of claim 1, wherein said implant body is made of bone.

20. The implant of claim 19, wherein:

said bone includes a medullary canal; and

said implant body defines a central opening that conforms generally to said medullary canal.

21. The implant of claim 1, wherein a portion of said implant body includes an unmachined donor implant bone portion.

22. The implant of claim 1, wherein said implant body has an upper bone engaging surface and a lower bone engaging surface, said upper and lower bone engaging surfaces each have a plurality of ridges defined thereon to minimize implant migration.

23. The implant of claim 1, wherein said implant body is tapered.

24. The implant of claim 23, wherein said implant body is made of bone.

25. The implant of claim 23, wherein a portion of said implant body includes an unmachined donor implant bone portion.

26. The implant of claim 23, wherein said implant body has an upper bone engaging surface and a lower bone engaging surface, said upper and lower bone engaging surface, each have a plurality of ridges defined thereon to minimize implant migration.

27. The implant of claim 23, wherein said implant body defines a third bore parallelly spaced apart from said first insertion tool bore, said third bore being smooth to receive a pin for minimizing implant rotation.

28. The implant of claim 23, wherein:

said implant body further includes an angled driving wall in which said second insertion tool bore is defined; and

said angled driving wall defines a recess surface that extends substantially perpendicular with respect to said second pair of sidewalls.

29. The implant of claim 1, wherein said implant body defines a central opening.

30. The implant of claim 1, wherein:

said implant body further includes an angled driving wall in which said second insertion tool bore is defined; and

said angled driving wall defines a recess surface that extends substantially perpendicular with respect to said second pair of sidewalls.

31. The implant of claim 30, wherein said implant body is made of bone.

32. The implant of claim 31, wherein:

said bone includes a medullary canal; and

said implant body defines a central opening that conforms generally to said medullary canal.

33. The implant of claim 30, wherein a portion of said implant body includes an unmachined donor implant bone portion.

34. The implant of claim 30, wherein said implant body has an upper bone engaging surface and a lower bone engaging surface, said upper and lower bone engaging surfaces each have a plurality of ridges defined thereon to minimize implant migration.

35. A spinal implant comprising:

an implant body having

a first pair of substantially parallel sidewalls, and

a second pair of substantially parallel sidewalls disposed at an oblique angle with respect to said first pair of sidewalls to permit insertion of said implant body into a disc space from multiple directions;

wherein said implant body defines a first insertion tool bore and a second insertion tool bore, said first tool bore extending substantially parallel to said first pair of sidewalls, said second tool bore extending substantially parallel to said second pair of sidewalls; and

wherein said implant body defines a third bore parallelly spaced apart from said first insertion tool bore, said third bore being smooth to receive a pin for minimizing implant rotation.

36. The implant of claim 35, wherein:

said implant body further includes a front end face and an opposing end face oriented in a substantially parallel arrangement; and

said front end face and said opposing end face extend substantially perpendicular with respect to said first pair of sidewalls.

37. The implant of claim 35, wherein said implant body has an upper bone engaging surface and a lower bone engaging surface, said upper and lower bone engaging surfaces each have a plurality of ridges defined thereon to minimize implant migration.

38. The implant of claim 35, wherein said implant body is made of bone.

39. The implant of claim 38, wherein:

said bone includes a medullary canal; and

said implant body defines a central opening that conforms generally to said medullary canal.

40. The implant of claim 38, wherein a portion of said implant body includes an unmachined donor implant bone portion.

41. A spinal implant, comprising:

an implant body having

a first pair of substantially parallel sidewalls; and

a second pair of substantially parallel sidewalls disposed at an oblique angle with respect to said first pair of sidewalls to permit insertion of said implant body into a disc space from multiple directions;

wherein said implant body defines a first insertion tool bore and a second insertion tool bore, said first tool bore extending substantially parallel to said first pair of sidewalls, said second tool bore extending substantially parallel to said second pair of sidewalls;

wherein said implant body is formed from bone; and

wherein said implant body further includes

a front end face,

an opposing end face oriented in a substantially parallel arrangement with said front end face, said front end face and said opposing end face extending substantially perpendicular with respect to said first pair of sidewalls,

a first unmachined portion extending between said opposing end face and one of said first pair of sidewalls,

a second unmachined portion extending between said opposing end face and one of said second pair of sidewalls, and

wherein said first unmachined portion and said second unmachined portion substantially maintain a natural shape of said bone.

42. The implant of claim 41, wherein:

said implant body further includes an angled driving wall in which said second insertion tool bore is defined; and

said angled driving wall defines a recess surface that extends substantially perpendicular with respect to said second pair of sidewalls.

43. The implant of claim 41, wherein said implant body defines a third bore parallelly spaced apart from said first insertion tool bore, said third bore being smooth to receive a pin for minimizing implant rotation.

44. The implant of claim 41, wherein said implant body has an upper bone engaging surface and a lower bone engaging surface, said upper and lower bone engaging surfaces each have a plurality of ridges defined thereon to minimize implant migration.

45. The implant of claim 41, wherein said implant body is tapered.

46. The implant of claim 41, wherein:

a first distance between said first pair of sidewalls is substantially identical to a second distance between said second pair of sidewalls; and

a third distance between said front end face and said opposing end face is substantially identical to said first and second distances.

47. The implant of claim 41, wherein:

said bone includes a medullary canal; and

said implant body defines a central opening that conforms generally to said medullary canal.