Height-and angle-adjustable motion disc implant

• US 20060136062A1
• Filed: 12/17/2004
• Published: 06/22/2006
• Est. Priority Date: 12/17/2004
• Status: Abandoned Application

• Current Assignee: Depuy Spine Incorporated (Johnson & Johnson)
• Original Assignee: Depuy Spine Incorporated (Johnson & Johnson)
• Inventors: DiMauro, Thomas M., Slivka, Michael, Serhan, Hassan, Sutton, Jeffrey Karl, DiNello, Alexandre, O'Neil, Michael
• Application Number:
  US11/015,927
• Publication Number:
  US 20060136062A1
• Time in Patent Office: Days
• US Class Current: 623/17.140
• CPC Class Codes: A61B 2017/00004 (bio)absorbable, (bio)resorbable, resorptive for implantable prostheses A61F2210/0004
• CPC Class Codes: A61F 2/4425 made of articulated components
• CPC Class Codes: A61F 2/482 Electrical means
• CPC Class Codes: A61F 2/484 Fluid means, i.e. hydraulic or pneumatic
• CPC Class Codes: A61F 2002/30069 elastomeric
• CPC Class Codes: A61F 2002/30075 swellable, e.g. when wetted
• CPC Class Codes: A61F 2002/30079 magnetic
• CPC Class Codes: A61F 2002/3008 radio-opaque, e.g. radio-opaque markers
• CPC Class Codes: A61F 2002/30266 wedge-shaped parallelepipeds
• CPC Class Codes: A61F 2002/30405 made by screwing complementary threads machined on the parts themselves
• CPC Class Codes: A61F 2002/30476 locked by an additional locking mechanism
• CPC Class Codes: A61F 2002/30487 Circumferential cooperating grooves and beads on cooperating lateral surfaces of a mainly longitudinal connection
• CPC Class Codes: A61F 2002/30514 using a locking washer
• CPC Class Codes: A61F 2002/30515 using a locking wedge or block
• CPC Class Codes: A61F 2002/3052 unrestrained in only one direction, e.g. moving unidirectionally
• CPC Class Codes: A61F 2002/30522 releasable, e.g. using a releasable ratchet
• CPC Class Codes: A61F 2002/30538 for adjusting angular orientation
• CPC Class Codes: A61F 2002/3055 for adjusting length
• CPC Class Codes: A61F 2002/30556 for adjusting thickness
• CPC Class Codes: A61F 2002/30579 with mechanically expandable devices, e.g. fixation devices
• CPC Class Codes: A61F 2002/30581 : having a pocket filled with fluid, e.g. liquid
• CPC Class Codes: A61F 2002/30649 : Ball-and-socket joints
• CPC Class Codes: A61F 2002/30668 : Means for transferring electromagnetic energy to implants
• CPC Class Codes: A61F 2002/443 : having two transversal endplates and at least one intermediate component
• CPC Class Codes: A61F 2002/449 : comprising multiple spinal implants located in different intervertebral spaces or in different vertebrae
• CPC Class Codes: A61F 2210/0061 : swellable
• CPC Class Codes: A61F 2210/009 : magnetic
• CPC Class Codes: A61F 2220/0025 : Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
• CPC Class Codes: A61F 2230/0082 : parallelepipedal
• CPC Class Codes: A61F 2250/0001 : Means for transferring electromagnetic energy to implants
• CPC Class Codes: A61F 2250/0006 : for adjusting angular orientation
• CPC Class Codes: A61F 2250/0009 : for adjusting thickness
• CPC Class Codes: A61F 2250/0098 : radio-opaque, e.g. radio-opaque markers
• 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 2310/00203 : containing alumina or aluminium oxide
• CPC Class Codes: A61F 2310/00239 : containing zirconia or zirconium oxide ZrO2

Abstract

This invention relates to an intervertebral motion disc having a height adjustable endplate.

Claims

1. A prosthetic endplate in an intervertebral motion disc, the endplate comprising:

i) an outer plate comprising

an outer surface adapted for fixation to a first vertebral body,

an inner surface having a threaded recess, and

a body portion therebetween,

ii) an inner plate comprising;

an inner surface having a first articulation surface,

an outer surface, and

a body portion therebetween having a threaded lateral surface,

wherein the threaded lateral surface of the body portion of the inner plate is mated with threaded recess of the outer plate.

2. The endplate of claim 1 wherein the at least one of the plates comprises a marker for determining height or angle.

3. The endplate of claim 2 wherein the marker is a Hall Sensor located upon the outer plate.

4. The endplate of claim 2 wherein the marker is radio-opaque.

5. The endplate of claim 1 wherein the inner plate contains a plurality of magnets.

6. The endplate of claim 1 further comprising:

iii) a pinion gear attached to the outer surface of the inner plate.

7. The endplate of claim 6 further comprising:

iv) a worm gear associated with the pinion gear.

8. The endplate of claim 1 wherein the first articulation surface is convex.

9. The endplate of claim 8 wherein the first articulation surface comprises polyethylene.

10. The endplate of claim 1 wherein the first articulation surface is concave.

11. The endplate of claim 10 wherein the first articulation surface comprises a metal.

12. The endplate of claim 1 further comprising:

iii) discrete adjustment means for discretely adjusting the inner plate relative to the outer plate.

13. The endplate of claim 1 further comprising:

iii) manual adjustment means for manually adjusting the inner plate relative to the outer plate.

14. The endplate of claim 13 wherein the manual adjustment means comprises a pinion gear.

15. The endplate of claim 1 further comprising:

iii) non-invasive adjustment means for non-invasively adjusting the inner plate relative to the outer plate.

16. The endplate of claim 15 wherein the non-invasive adjustment means comprises a magnet.

17. The endplate of claim 1 further comprising:

iii) one-way adjustment means for adjusting the inner plate relative to the outer plate in one direction.

18. A method of adjusting a position of a prosthetic endplate, comprising the steps of:

a) providing a prosthetic endplate comprising;

i) an outer plate comprising an outer surface adapted for fixation to a first vertebral body,

an inner surface having a threaded recess, and

a body portion therebetween,

ii) an inner plate comprising;

an inner surface,

an outer surface, and

a body portion therebetween having a threaded lateral surface,

wherein the threaded lateral surface of the body portion of the inner plate is mated with threaded recess of the outer plate,

b) fixing the outer surface of the outer plate to the first vertebral body to produce a first relative position of the inner plate upon the outer plate, and

c) selectively adjusting the first relative position to a second relative position of the inner plate upon the outer plate.

19. A prosthetic endplate in an intervertebral motion disc, the endplate comprising:

i) an outer plate comprising

an outer surface adapted for fixation to a first vertebral body,

an inner surface having a threaded recess, and

a body portion therebetween,

ii) an inner plate comprising;

an inner surface,

an outer surface, and

a body portion therebetween having a threaded lateral surface,

wherein the threaded lateral surface of the body portion of the inner plate is mated with threaded recess of the outer plate.

20. The endplate of claim 19 wherein the inner surface of the inner plate is non-articulating.

21. A prosthetic endplate in an intervertebral motion disc, the endplate comprising:

i) an outer plate comprising

an outer surface adapted for fixation to a first vertebral body,

an inner surface having a recess therein, and

a body portion therebetween, and

ii) an inner plate comprising;

an inner surface having a first articulation surface,

an outer surface having a wedged surface, and

a body portion therebetween disposed within the recess of the outer plate.

22. The endplate of claim 21 further comprising:

iii) a first wedge having a corresponding wedge surface for providing sliding contact with the wedged surface of the inner plate.

23. The endplate of claim 22 wherein the wedge comprises a throughbore, and

wherein the endplate further comprises:

iv) a captive screw having an elongated shaft having a threaded surface thereon, wherein the elongated shaft is disposed within the throughbore of the wedge.

24. The endplate of claim 22 further comprising:

iv) manual adjustment means for adjusting the wedge relative to the wedge surface.

25. The endplate of claim 24 wherein the manual adjustment means comprises a proximal head located on the captive screw.

26. The endplate of claim 22 further comprising:

iv) non-invasive adjustment means for adjusting the wedge relative to the wedge surface.

27. The endplate of claim 26 wherein the non-invasive adjustment means comprises a proximal head located on the captive screw, wherein the proximal head is magnetic.

28. The endplate of claim 22 wherein the wedge has a pusher rod or puller rod attached thereto.

29. The endplate of claim 22 wherein the wedge comprises at least one tooth.

30. The endplate of claim 29 wherein the wedge comprises a spring-loaded tooth.

31. The endplate of claim 22 wherein the wedged surface comprises a plurality of teeth.

32. The endplate of claim 22 further comprising a second wedge.

33. The endplate of claim 22 further comprising second and third wedges.

34. The endplate of claim 33 wherein the three wedges are spaced about 120 degrees apart.

35. The endplate of claim 33 wherein the first wedge is associated with a pusher rod or puller rod, and the second wedge is associated with a captive screw.

36. The endplate of claim 21 further comprising:

iii) an expandable bag having a corresponding wedge surface for providing contact with the wedged surface of the inner plate.

37. A kit for correcting spinal deformity comprising:

a) an intervertebral motion disc, and

b) a vertebral tether.

38. The kit of claim 37 wherein the motion disc comprises wedged endplates.

39. The kit of claim 37 wherein the motion disc comprises a prosthetic endplate comprising:

i) an outer plate comprising;

an outer surface adapted for fixation to a first vertebral body,

an inner surface having a recess therein, and

a body portion therebetween, and

ii) an inner plate comprising;

an inner surface having a first articulation surface,

an outer surface having a wedged surface, and

a body portion therebetween disposed within the recess of the outer plate.

40. A method of correcting a spinal deformity, comprising the steps of:

a) providing a deformed functional spinal unit comprising an intervertebral disc and opposing endplates,

b) removing at least a portion of the intervertbral disc to form a disc space,

c) inserting an intervertebral motion disc having wedged shape into the disc space.

41. The method of claim 40 wherein the motion disc is inserted into a convex side of a deformity.

42. The method of claim 41 further comprising the step of:

d) tethering the functional spinal unit to correct the deformity.

43. The method of claim 40 wherein the motion disc is inserted into a concave side of a deformity.

44. The method of claim 40 wherein the deformed functional spinal unit comprises deformed opposing endplates.

45. The method of claim 44 further comprising the step of:

d) tethering the functional spinal unit to correct the deformity.

46. A prosthetic endplate in an intervertebral motion disc, the endplate comprising:

i) an outer plate comprising

an outer surface adapted for fixation to a first vertebral body,

an inner surface having a recess therein, and

a body portion therebetween, and

ii) an inner plate comprising;

an inner surface and an outer surface forming a wedge, and

a body portion therebetween disposed within the recess of the outer plate.

47. The endplate of claim 46 wherein the at least one of the plates comprises a marker for determining height or angle.

48. A motion disc comprising:

a) a first rigid endplate having a moveable wedge therein, the wedge having an outer surface, and

b) a second flexible endplate having a flexible portion attached to a rigid portion having a wedge surface,

wherein the outer surface of the wedge of the first rigid endplate slides against the wedge surface of the second flexible endplate.