Polyaryletherketone Artificial Intervertebral Disc

• US 20090276051A1
• Filed: 05/05/2009
• Published: 11/05/2009
• Est. Priority Date: 05/05/2008
• Status: Abandoned Application

• Current Assignee: Simplify Medical Pty. Ltd. (Nuvasive Incorporated)
• Original Assignee: SpinalMotion, Inc. (Globus Medical, Inc.)
• Inventors: de Villiers, Malan, Jansen, Neville, Arramon, Yves
• Application Number:
  US12/435,572
• Publication Number:
  US 20090276051A1
• Time in Patent Office: Days
• US Class Current: 623/17.160
• CPC Class Codes: A61F 2/30734 Modular inserts, sleeves or augments, e.g. placed on proximal part of stem for fixation purposes or wedges for bridging a bone defect
• 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 2002/3008 radio-opaque, e.g. radio-opaque markers
• CPC Class Codes: A61F 2002/30448 using adhesives
• CPC Class Codes: A61F 2002/305 Snap connection
• CPC Class Codes: A61F 2002/30565 having spring elements
• CPC Class Codes: A61F 2002/30663 multiaxial, e.g. biaxial; multipolar, e.g. bipolar or having an intermediate shell articulating between the ball and the socket
• CPC Class Codes: A61F 2002/30841 Sharp anchoring protrusions for impaction into the bone, e.g. sharp pins, spikes
• CPC Class Codes: A61F 2002/30879 Ribs
• CPC Class Codes: A61F 2002/30884 Fins or wings, e.g. longitudinal wings for preventing rotation within the bone cavity
• CPC Class Codes: A61F 2002/30899 Protrusions pierced with apertures
• CPC Class Codes: A61F 2002/30904 serrated profile, i.e. saw-toothed
• CPC Class Codes: A61F 2002/443 having two transversal endplates and at least one intermediate component
• CPC Class Codes: A61F 2310/00407 Coating made of titanium or of Ti-based alloys
• CPC Class Codes: A61F 2310/00796 Coating or prosthesis-covering structure made of a phosphorus-containing compound, e.g. hydroxy(l)apatite
• CPC Class Codes: A61L 2430/38 for reconstruction of the spine, vertebrae or intervertebral discs
• CPC Class Codes: A61L 27/18 obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
• CPC Class Codes: C08L 71/00 Compositions of polyethers obtained by reactions forming an ether link in the main chain of polyacetals C08L59/00; of epoxy resins C08L63/00; of polythioether-ethers C08L81/02; of polyether-sulfones C08L81/06; Compositions of derivatives of such polymers

Abstract

An intervertebral prosthesis for insertion between adjacent vertebrae, in one embodiment, includes upper and lower prosthesis plates and a movable core. The prosthesis plates and optionally the core are formed of polyaryletherketone (PAEK) for improved imaging properties. A metallic insert is provided on each of the PAEK prosthesis plates providing a bone ongrowth surface.

Claims

1. An intervertebral disc comprising:

an upper plate having an upper vertebra contacting surface and a lower bearing surface, wherein the upper plate is formed of polyaryletherketone (PAEK) with the upper surface formed at least in part from a metallic insert having a plurality of projections formed thereon for improving bone attachment;

a lower plate having a lower vertebra contacting surface and an upper bearing surface, wherein the lower plate is formed of PAEK with the lower surface formed at least in part from a metallic insert having a plurality of projections formed thereon for improving bone attachment; and

a core positioned between the upper and lower plates, the core having upper and lower surfaces configured to mate with the bearing surfaces of the upper and lower plates.

2. The disc of claim 1, wherein the core is movable with respect to the upper and lower plates.

3. The disc of claim 1, further comprising anchoring elements in the form of fins extending from the upper surface of the upper plate and from the lower surface of the lower plate.

4. The disc of claim 3, wherein the fins each have a height greater than their width and a length greater than their height.

5. The disc of claim 3, wherein the fin is formed of PAEK.

6. The disc of claim 3, wherein the fin is formed is formed of PAEK and is covered with a metallic material.

7. The disc of claim 3, wherein the fin is formed as a part of the metallic insert.

8. The disc of claim 1, wherein the metallic inserts are formed of titanium.

9. The disc of claim 1, wherein the metallic inserts are insert molded into the PAEK of the upper and lower plates.

10. The disc of claim 1, wherein the metallic inserts having a thickness of about 0.1 to about 1.0 mm.

11. The disc of claim 1, wherein the metallic inserts are attached to the PAEK of the upper and lower plates by a press fit connection.

12. The disc of claim 1, wherein a portion of the upper surface of the upper plate and the lower surface of the lower plate include titanium plasma spray coating for bone attachment.

13. The disc of claim 1, wherein the core is formed of PAEK.

24. The disc of claim 1, wherein the core is formed of PAEK.

25. The disc of claim 1, wherein the metallic inserts comprise stamped teeth.

14. An intervertebral disc comprising:

an upper plate having an upper vertebra contacting surface and a lower bearing surface, wherein the upper plate is formed of polyaryletherketone (PAEK) with the upper surface formed at least in part from a metallic insert having a thickness of at least 0.3 mm;

a lower plate having a lower vertebra contacting surface and an upper bearing surface, wherein the lower plate is formed of PAEK with the lower surface formed at least in part from a metallic insert having a thickness of at least 0.3 mm; and

a core positioned between the upper and lower plates, the core having upper and lower surfaces configured to mate with the bearing surfaces of the upper and lower plates.

15. The disc of claim 14, wherein the core is movable with respect to the upper and lower plates.

16. The disc of claim 14, further comprising anchoring elements in the form of fins extending from the upper surface of the upper plate and from the lower surface of the lower plate.

17. The disc of claim 16, wherein the fins each have a height greater than their width and a length greater than their height.

18. The disc of claim 16, wherein the fin is formed of PAEK.

19. The disc of claim 16, wherein the fin is formed is formed of PAEK and is covered with a metallic material.

20. The disc of claim 16, wherein the fin is formed as a part of the metallic insert.

21. The disc of claim 14, wherein the metallic inserts are formed of titanium.

22. The disc of claim 14, wherein the metallic inserts are insert molded into the PAEK of the upper and lower plates.

23. The disc of claim 14, wherein the metallic inserts are attached to the PAEK of the upper and lower plates by a press fit connection.

26. An intervertebral disc comprising:

an upper plate having an upper vertebra contacting surface and a lower bearing surface, wherein the upper plate is formed of polyaryletherketone (PAEK) with the upper surface formed at least in part from a metallic insert having a plurality of projections formed thereon for improving bone attachment;

a lower plate having a lower vertebra contacting surface and an upper bearing surface, wherein the lower plate is formed of PAEK with the lower surface formed at least in part from a metallic insert having a plurality of projections formed thereon for improving bone attachment; and

wherein the upper and lower bearing surfaces are configured to allow articulation between the upper vertebra contacting surface and the lower vertebra contacting surface.

27. The disc of claim 26, wherein the upper and lower bearing surfaces are configured to engage a movable core positioned between the upper and lower plates.

28. The disc of claim 26, further comprising anchoring elements in the form of fins extending from the upper surface of the upper plate and from the lower surface of the lower plate.

29. The disc of claim 28, wherein the fins each have a height greater than their width and a length greater than their height.

30. The disc of claim 28, wherein the fins are formed of PAEK.

31. The disc of claim 26, wherein the metallic inserts are formed of titanium.

32. The disc of claim 26, wherein the metallic inserts are insert molded into the PAEK of the upper and lower plates.

33. The disc of claim 26, wherein the metallic inserts having a thickness of about 0.1 to about 1.0 mm.

34. The disc of claim 26, wherein the metallic inserts are attached to the PAEK of the upper and lower plates by a press fit connection.

35. The disc of claim 26, wherein the metallic inserts are attached to the PAEK and cover at least 50% of bone contacting surface of the upper and lower plates.

36. The disc of claim 26, wherein the PAEK comprises polyetheretherketone (PEEK).

37. An intervertebral disc comprising:

an upper plate formed of polyaryletherketone (PAEK) with a metallic insert fixed to the PAEK and configured to contact a first vertebra;

a lower plate formed of PAEK with a metallic insert fixed to the PAEK and configured to contact a second vertebra adjacent to the first vertebra; and

wherein the upper and lower plates are arranged to articulate in a anterior-posterior direction and in a lateral direction with respect to one another and to rotate with respect to one another.