Laterally insertable artificial vertebral disk replacement implant with crossbar spacer

• US 20050125065A1
• Filed: 11/05/2004
• Published: 06/09/2005
• Est. Priority Date: 11/05/2003
• Status: Active Grant

• Current Assignee: Kyphon SARL (Medtronic Plc)
• Original Assignee: St. Francis Medical Technologies, Inc. (Medtronic Plc)
• Inventors: Mitchell, Steven T., Zucherman, James F., Hsu, Ken Y.
• Granted Patent: US 7,520,899 B2
• Time in Patent Office: Days
• US Class Current: 623/17.150
• CPC Class Codes: A61F 2/30771 applied in original prostheses, e.g. holes or grooves
• CPC Class Codes: A61F 2/30965 Reinforcing the prosthesis by embedding particles or fibres during moulding or dipping
• CPC Class Codes: A61F 2/4425 made of articulated components
• CPC Class Codes: A61F 2002/30172 T-shaped
• CPC Class Codes: A61F 2002/30179 X-shaped
• CPC Class Codes: A61F 2002/30392 Rotation
• CPC Class Codes: A61F 2002/30878 with non-sharp protrusions, for instance contacting the bone for anchoring, e.g. keels, pegs, pins, posts, shanks, stems, struts
• CPC Class Codes: A61F 2002/30884 Fins or wings, e.g. longitudinal wings for preventing rotation within the bone cavity
• CPC Class Codes: A61F 2002/30892 parallel
• CPC Class Codes: A61F 2002/30899 Protrusions pierced with apertures
• CPC Class Codes: A61F 2002/443 having two transversal endplates and at least one intermediate component
• CPC Class Codes: A61F 2220/0025 Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
• CPC Class Codes: A61F 2230/0028 Shapes in the form of latin or greek characters
• CPC Class Codes: A61F 2230/0052 T-shaped
• 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 2310/00029 Cobalt-based alloys, e.g. Co-Cr alloys or Vitallium
• CPC Class Codes: A61F 2310/00976 Coating or prosthesis-covering structure made of proteins or of polypeptides, e.g. of bone morphogenic proteins BMP or of transforming growth factors TGF

Abstract

The present invention is directed to an implant that can be placed between two adjacent vertebral bodies using a lateral insertion method. The implant is characterized as having a first end plate and a second end plate which a crossbar spacer therebetween. The crossbar spacer preferably fits within a channel on the inner surfaces of the first end plate and the second end plate, whereby the crossbar spacer allows pivots, twisting and/or rotational movement of the spine. The first end plate and the second end plate include a keel extending therefrom, whereby the keel traverses longitudinally between a first lateral side and a second opposed lateral side and is substantially perpendicular to the sagittal plane of the patient'"'"'s spine.

Claims

1. An intervertebral implant adapted to be inserted between adjacent vertebral bodies comprising:

a. a first end plate adapted to mate with a first vertebral body, the first end plate further comprising;

i. a first inner surface;

ii. a first outer surface; and

iii. a first keel on the first outer surface, wherein the first keel is oriented substantially perpendicular to the sagittal plane of the vertebral bodies;

b. a second end plate having a second outer surface adapted to mate with a second vertebral body, the second end plate including a second inner surface opposed to the first inner surface; and

c. a crossbar spacer positioned between the first and second inner surfaces.

2. The implant of claim 1 wherein the first keel further comprises a plurality of angled teeth.

3. The implant of claim 1 wherein the second end plate further comprises a second keel on the second outer surface, wherein the second keel is substantially perpendicular to the sagittal plane of the vertebral bodies.

4. The implant of claim 3 wherein the second keel further comprises a plurality of angled teeth.

5. The implant of claim 1 wherein the first keel further comprises a plurality of keels on the first outer surface.

6. The implant of claim 1 wherein the crossbar spacer further comprises:

a. a first member in contact with the first inner surface; and

b. a second member attached to the first member and oriented substantially perpendicular thereto, the second member in contact with the second inner surface.

7. The implant of claim 1 wherein the first end plate further comprises a first channel disposed in the first inner surface, wherein the first channel receives a portion of the crossbar spacer.

8. The implant of claim 7 wherein the first channel is oriented in a direction extending between an anterior end and a posterior end of the first end plate.

9. The implant of claim 7 wherein the first channel is oriented in a direction between a first lateral end and a second lateral end of the first end plate.

10. The implant of claim 1 wherein the second end plate further comprises a second channel disposed in the second inner surface, wherein the second channel receives a portion of the crossbar spacer.

11. The implant of claim 10 wherein the second channel is oriented in a direction extending between an anterior end and a posterior end of the second end plate.

12. The implant of claim 10 wherein the second channel is oriented in a direction between a first lateral end and a second lateral end of the second end plate.

13. An implant adapted to be inserted between adjacent vertebral bodies, comprising:

a. a first end plate having a first outer surface adapted to mate with a first vertebral body, the first end plate further comprising;

i. a first inner surface; and

ii. a first keel on the first outer surface, wherein the first keel is oriented substantially perpendicular to the sagittal plane of the vertebral bodies;

b. a second end plate having a second outer surface adapted to mate with a second vertebral body, the second end plate further comprising;

i. a second inner surface opposed to the first inner surface; and

ii. a second keel on the second outer surface, wherein the second keel is oriented substantially perpendicular to the sagittal plane of the vertebral bodies; and

c. a crossbar spacer in contact with the first and second inner surfaces.

14. The implant of claim 13 wherein the first keel further comprises a plurality of first keels on the first outer surface.

15. The implant of claim 13 wherein the first keel further comprises a plurality of teeth.

16. The implant of claim 13 wherein the second keel further comprises a plurality of second keels on the second outer surface.

17. The implant of claim 13 wherein the second keel further comprises a plurality of teeth.

18. The implant of claim 13 wherein the crossbar spacer further comprises:

a. a first member in contact with the first inner surface; and

b. a second member attached to the first member and oriented substantially perpendicular thereto, the second member in contact with the second inner surface.

19. The implant of claim 13 wherein the first end plate further comprises a first channel disposed in the first inner surface, wherein the first channel receives a portion of the crossbar spacer.

20. The implant of claim 19 wherein the first channel is oriented in a direction extending between an anterior end and a posterior end of the first end plate.

21. The implant of claim 19 wherein the first channel is oriented in a direction extending between a first lateral end and a second lateral end of the first end plate.

22. The implant of claim 13 wherein the second end plate further comprises a second channel disposed in the second inner surface, wherein the second channel receives a portion of the crossbar spacer.

23. The implant of claim 22 wherein the second channel is oriented in a direction extending between an anterior end and a posterior end of the second end plate.

24. The implant of claim 22 wherein the second channel is oriented in a direction between a first lateral end and a second lateral end of the second end plate.

25. An intervertebral implant adapted to be inserted between adjacent vertebral bodies comprising:

a. an articulating unit further comprising;

i. an anterior end;

ii. a posterior end;

iii. a first lateral end; and

iv. a second lateral end;

b. a keel extending from the articulating unit and oriented in a lengthwise direction between the first and second lateral ends; and

c. a crossbar spacer positioned within the articulating unit.

26. The implant of claim 25 wherein the keel further comprises at least one first keel extending from a first outer surface of the articulating unit.

27. The implant of claim 26 wherein the keel further comprises at least one second keel extending from a second outer surface of the articulating unit.

28. The implant of claim 25 wherein the crossbar spacer further comprises:

a. a first member in contact with a first inner surface of the articulating unit; and

b. a second member oriented substantially perpendicular to the first member, the second member in contact with a second opposed inner surface of the articulating unit.

29. The implant of claim 25 wherein the articulating unit further comprises a first channel disposed in a first inner surface, wherein the first channel receives a portion of the crossbar spacer.

30. The implant of claim 29 wherein the first channel is oriented lengthwise between the first and second lateral ends.

31. The implant of claim 29 wherein the first channel is oriented lengthwise between the anterior and posterior ends.

32. The implant of claim 29 wherein the articulating unit further comprises a second channel disposed in a second opposed inner surface, wherein the second channel receives a portion of the crossbar spacer.

33. The implant of claim 32 wherein the second channel is oriented lengthwise between the first and second lateral ends.

34. The implant of claim 32 wherein the second channel is oriented lengthwise between the anterior and posterior ends.

35. An intervertebral implant comprising:

a. an articulating unit adapted to be inserted between adjacent vertebral bodies, the articulating unit having a first channel therein;

b. a crossbar spacer in contact with the first channel, wherein the crossbar spacer and the first channel allow the articulating unit to rotate in association with flexion and extension of at least one of the vertebral bodies; and

c. a first keel adapted to mate with a vertebral body, the first keel extending from a first outer surface of the articulating unit and oriented to be substantially parallel with the first channel.

36. The implant of claim 35 wherein the first keel further comprises a plurality of teeth.

37. The implant of claim 35 further comprising a second keel extending from a second outer surface of the articulating unit, the second keel oriented substantially parallel with the first channel.

38. The implant of claim 37 wherein the first keel further comprises a plurality of teeth.

39. The implant of claim 35 wherein the articulating unit further comprises a second channel therein to receive the crossbar spacer wherein the crossbar spacer and the second channel allow the articulating unit to rotate in association with lateral bending of at least one of the vertebral bodies.

40. The implant of claim 39 wherein the crossbar spacer further comprises:

a. a first member in contact with the first channel in the articulating unit; and

b. a second member oriented substantially perpendicular to the first member, the second member in contact with the second channel.

41. The implant of claim 35 wherein the first keel is oriented substantially perpendicular to the sagittal plane of the vertebral body.

42. An implant adapted to be inserted between adjacent vertebral bodies in a spine comprising:

a. a first end plate having a first inner surface and a first keel on a first outer surface, wherein the first keel is oriented substantially parallel to the coronal plane of the spine;

b. a second end plate having a second inner surface opposed to the first inner surface and a second keel on a second outer surface, wherein the second keel is oriented substantially parallel to the first keel; and

c. a spacer having a first spacer member in contact with the first inner surface and a second spacer member in contact with the second inner surface and oriented perpendicular to the first spacer member.

43. An implant adapted to be inserted into a spine comprising:

a. a first end plate having a first outer surface adapted to be substantially in contact with an upper vertebral body;

b. a second end plate having a second outer surface adapted to be substantially in contact with a lower vertebral body;

c. a first keel protruding from the first outer surface and extending lengthwise between a first lateral end and a second lateral end of the first end plate; and

d. a second keel protruding from the second outer surface and oriented to be substantially parallel to the first keel.

44. An implant adapted to be inserted between adjacent vertebral bodies in a spine, the implant comprising:

a. an articulating unit having an outer surface adapted to be substantially in contact with a vertebral body;

b. a crossbar spacer positioned within the articulating unit, wherein the crossbar spacer allows at least a portion of the articulating unit to rotate in association with flexion and extension of at least one of the vertebral bodies; and

c. a keel extending from the outer surface of the articulating unit and oriented to extend lengthwise between a first lateral end and a second lateral end of the articulating unit.

45. An implant adapted to be inserted between adjacent vertebral bodies in a spine, the implant comprising:

a. an articulating unit having an outer surface adapted to be substantially in contact with a vertebral body, the articulating unit adapted to receive a crossbar spacer; and

b. a keel extending from the outer surface of the articulating unit and oriented to extend lengthwise between a first lateral end and a second lateral end of the unit.

46. In an interspinous disk replacement implant, the improvement comprising:

at least one keel adapted to be perpendicular to the sagittal plane of a spine when the implant is inserted into the spine.

47. In an interspinous disk replacement implant in a spine, the improvement comprising:

a. a crossbar spacer in contact with an inner surface the implant, wherein the crossbar spacer accommodates flexion and extension movement of the spine; and

b. a keel extending from an outer surface of the implant and adapted to be secured into a vertebral body, wherein the keel is approximately perpendicular to the sagittal plane of the spine.

48. In an interspinous disk replacement implant, the improvement comprising:

at least one keel extending from an outer surface of the implant from a first lateral side to a second lateral side, the at least one keel adapted to be insertable laterally into the spine.