MODULAR INTERVERTEBRAL DISC PROSTHESIS AND METHOD OF REPLACING AN INTERVERTEBRAL DISC

• US 20080051902A1
• Filed: 08/08/2007
• Published: 02/28/2008
• Est. Priority Date: 08/10/2006
• Status: Abandoned Application

• Current Assignee: James Dwyer
• Original Assignee: James Dwyer
• Inventors: DWYER, James
• Application Number:
  US11/835,756
• Publication Number:
  US 20080051902A1
• Time in Patent Office: Days
• US Class Current: 623/17.16
• CPC Class Codes: A61F 2/30965 Reinforcing the prosthesis by embedding particles or fibres during moulding or dipping
• 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 2/4425 made of articulated components
• CPC Class Codes: A61F 2/4455 for the fusion of spinal bodies, e.g. intervertebral fusion of adjacent spinal bodies, e.g. fusion cages intervertebral discs A61F2/442
• CPC Class Codes: A61F 2/4611 of spinal prostheses
• CPC Class Codes: A61F 2002/302 toroidal, e.g. rings
• CPC Class Codes: A61F 2002/30331 made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit
• CPC Class Codes: A61F 2002/30383 made by laterally inserting a protrusion, e.g. a rib into a complementarily-shaped groove
• CPC Class Codes: A61F 2002/30471 connected by a hinged linkage mechanism, e.g. of the single-bar or multi-bar linkage type
• CPC Class Codes: A61F 2002/30492 using a locking pin
• CPC Class Codes: A61F 2002/305 Snap connection
• CPC Class Codes: A61F 2002/30563 having elastic means or damping means, different from springs, e.g. including an elastomeric core or shock absorbers
• CPC Class Codes: A61F 2002/30579 with mechanically expandable devices, e.g. fixation devices
• CPC Class Codes: A61F 2002/30604 modular
• CPC Class Codes: A61F 2002/30616 Sets comprising a plurality of prosthetic parts of different sizes or orientations
• CPC Class Codes: A61F 2002/30649 Ball-and-socket joints
• CPC Class Codes: A61F 2002/30677 Means for introducing or releasing pharmaceutical products, e.g. antibiotics, into the body
• CPC Class Codes: A61F 2002/30841 Sharp anchoring protrusions for impaction into the bone, e.g. sharp pins, spikes
• CPC Class Codes: A61F 2002/443 having two transversal endplates and at least one intermediate component
• CPC Class Codes: A61F 2002/4687 Mechanical guides for implantation instruments
• CPC Class Codes: A61F 2220/0025 : Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
• CPC Class Codes: A61F 2220/0033 : made by longitudinally pushing a protrusion into a complementary-shaped recess, e.g. held by friction fit
• CPC Class Codes: A61F 2220/0091 : connected by a hinged linkage mechanism, e.g. of the single-bar or multi-bar linkage type
• CPC Class Codes: A61F 2230/0065 : toroidal, e.g. ring-shaped, doughnut-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 2310/00203 : containing alumina or aluminium oxide
• CPC Class Codes: A61F 2310/00239 : containing zirconia or zirconium oxide ZrO2
• CPC Class Codes: A61F 2310/00293 : containing a phosphorus-containing compound, e.g. apatite
• CPC Class Codes: A61F 2310/00317 : containing silicon nitride
• CPC Class Codes: A61F 2310/00407 : Coating made of titanium or of Ti-based alloys

Abstract

An intervertebral disc prosthesis is provided. The prosthesis includes a first and second plate containing modular anchors that are moveable from a radially un-extended position in a non-deployed configuration to a radially extended position in a deployed configuration. A method of replacing a natural intervertebral disc with a prosthetic disc is also provided.

Claims

1. An intervertebral disc prosthesis comprising:

a first plate having a first channel extending at least partially therethrough, an upper surface containing a slot in fluid communication with the first channel, and a lower surface;

a first moveable anchor disposable in the first channel;

a second plate having a second channel extending at least partially therethrough, a lower surface containing a slot in fluid communication with the second channel, and an upper surface; and

a second moveable anchor disposable in the second channel.

2. The intervertebral disc prosthesis of claim 1, wherein the first and second anchors are disposed in the first and second channels, respectively.

3. The intervertebral disc prosthesis of claim 1, wherein the first and second anchors have substantially smooth surfaces.

4. The intervertebral disc prosthesis of claim 1, wherein the first and second anchor are each wedge-shaped.

5. The intervertebral disc prosthesis of claim 1, wherein the first and second anchors have zigzag edges comprising teeth.

6. The intervertebral disc prosthesis of claim 1, wherein the upper surface of the first plate and the lower surface of the second plate have convex configurations.

7. The intervertebral disc prosthesis of claim 1, wherein the first and second plate are wedge-shaped.

8. The intervertebral disc prosthesis of claim 1, wherein the first plate defines pores extending from the upper surface to the lower surface thereof and the second plate defines pores extending from the upper surface to the lower surface thereof.

9. The intervertebral disc prosthesis of claim 1, wherein the lower surface of the first plate is concave and the upper surface of the second plate is convex.

10. The intervertebral disc prosthesis of claim 1, further comprising a spacer positionable between the first and second plate.

11. The intervertebral disc prosthesis of claim 10, wherein the lower surface of the first plate is concave and an upper surface of the spacer is convex.

12. The intervertebral disc prosthesis of claim 9, wherein the first plate comprises connection means and the spacer comprises reciprocal connection means that accept the connection means of the first plate to secure the first plate to the spacer.

13. The intervertebral disc prosthesis of claim 9, wherein the second plate defines a central indentation which receives the spacer.

14. The intervertebral disc prosthesis of claim 1, further comprising a first pin insertable in the first channel and a second pin insertable in the second channel.

15. The intervertebral disc prosthesis of claim 14, wherein each of the first and second pins have substantially smooth surfaces.

16. The intervertebral disc prosthesis of claim 14, wherein each of the first and second channels are threaded and each of the first and second pins are cooperatively threaded.

17. The intervertebral disc prosthesis of claim 1, wherein the first plate further comprises a porous layer coating the upper surface thereof and the second plate further comprises a porous layer coating the lower surface thereof.

19. The intervertebral disc prosthesis of claim 1, wherein the moveable anchor is disposed in the channel.

21. A spinal kit comprising

the disc prosthesis of claim 1;

and

an interbody fusion cage comprising a hollow cylindrical body having an outer wall defining a plurality of fenestrations.

22. The spinal kit of claim 21, wherein the outer wall of the interbody fusion cage is at least partially threaded.

23. A spinal kit comprising:

The disc prosthesis of claim 1;

a paddle comprising a handle at a proximal portion thereof and a flattened portion at a distal portion thereof; and

an alignment jig.

18. The intervertebral disc prosthesis of claim 1, wherein the first and second plate define apertures on a side surface thereof that are adapted to receive an insertion tool.

18-1. An intervertebral disc prosthesis member comprising:

a plate having a channel extending at least partially therethrough, an upper surface comprising a slot in fluid communication with the channel, and a lower surface; and

a moveable anchor disposable in the channel.

20. A spinal kit comprising:

a plurality of disc prostheses, each of the disc prostheses comprising;

a first plate having a first channel extending at least partially therethrough, an

upper surface comprising a slot in fluid communication with the first channel, and a lower surface;

a first moveable anchor disposable in the first channel;

a second plate having a second channel extending at least partially therethrough, a lower surface comprising a slot in fluid communication with the second channel, and an upper surface; and

a second moveable anchor disposable in the second channel, wherein each of the plurality of disc prostheses have different anterior-posterior depths and/or different medial-lateral widths.

24. A method of replacing a natural intervertebral disc in a patient with a prosthetic intervertebral disc comprising:

providing a prosthetic intervertebral disc comprising a modular anchor moveable from a radially un-extended position in a non-deployed configuration to a radially extended position in a deployed configuration;

removing a natural intervertebral disc from the intervertebral space;

inserting a prosthetic intervertebral disc in a non-deployed configuration in the intervertebral space; and

deployed the anchor to extend into adjacent vertebral bodies and secure the prosthetic intervertebral disc in the intervertebral space.