Intervertebral device and method of use

• US 20040010316A1
• Filed: 03/28/2003
• Published: 01/15/2004
• Est. Priority Date: 03/30/2002
• Status: Active Grant

• Current Assignee: IMDS LLC
• Original Assignee: Infinity Orthopedics Limited
• Inventors: William, Lytton, Wong, Sui-Kay
• Granted Patent: US 7,717,959 B2
• Time in Patent Office: Days
• US Class Current: 623/17.16
• CPC Class Codes: A61F 2/4425 made of articulated components
• CPC Class Codes: A61F 2002/30079 magnetic
• CPC Class Codes: A61F 2002/30092 using shape memory or superelastic materials, e.g. nitinol
• CPC Class Codes: A61F 2002/30387 Dovetail connection
• CPC Class Codes: A61F 2002/30433 using additional screws, bolts, dowels, rivets or washers e.g. connecting screws
• CPC Class Codes: A61F 2002/305 Snap connection
• CPC Class Codes: A61F 2002/30507 using a threaded locking member, e.g. a locking screw or a set screw
• CPC Class Codes: A61F 2002/30654 Details of the concave socket
• CPC Class Codes: A61F 2002/30795 Blind bores, e.g. of circular cross-section
• CPC Class Codes: A61F 2002/30841 Sharp anchoring protrusions for impaction into the bone, e.g. sharp pins, spikes
• CPC Class Codes: A61F 2002/30892 parallel
• CPC Class Codes: A61F 2002/443 having two transversal endplates and at least one intermediate component
• CPC Class Codes: A61F 2210/0014 using shape memory or superelastic materials, e.g. nitinol
• 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 2220/0041 using additional screws, bolts, dowels or rivets, e.g. connecting screws
• 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 2310/00053 Vanadium or V-based alloys
• 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 2310/00407 : Coating made of titanium or of Ti-based alloys
• 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

An intervertebral disc replacement device is disclosed and includes a first implantable member having a first anchor plate and a concave body detachably coupled to the first anchor plate, and a second implantable member having a second anchor plate and a convex body detachably coupled to the second anchor plate, the convex body configured to engage the concave body in movable relation thereto.

Claims

1. An intervertebral disc replacement device, comprising:

a first implantable member having a first anchor plate and a concave body detachably coupled to the first anchor plate; and

a second implantable member having a second anchor plate and a convex body detachably coupled to the second anchor plate, the convex body configured to engage the concave body in movable relation thereto.

2. The device of claim 1 wherein the concave body is coupled to the first anchor plate using at least one device selected from the group consisting of coupling tracks, friction fit devices, slip-fit devices, locking members, magnetic coupling devices, twist locks, and snap-fit devices.

3. The device of claim 1 wherein the first anchor plate further comprises:

a base plate;

at least one retaining wall in communication witht the base plate;

at least one retaining flange in communication with the retaining wall and forming at least one concave body receiver configured to receive the concave body therein;

at least one coupling member receiver formed on the first anchor plate; and

at least one anchoring element positioned on the periphery of the base plate and configured to engage and be retained within an endplate of a vertebra.

4. The device of claim 3 wherein the concave body further comprises at least one support wall having at least one coupling track formed thereon, the coupling track configured to engage and detachably couple the concave body to the first anchor plate.

5. The device of claim 1 wherein the concave body further comprises at least one concave recess formed therein.

6. The device of claim 5 wherein the concave recess defines a longitudinal arc positioned along a longitudinal axis of the concave body.

7. The device of claim 5 wherein the concave recess defines a lateral arc positioned along a lateral axis of the concave body.

8. The device of claim 5 wherein the concave recess defines a longitudinal arc and a lateral arc.

9. The device of claim 4 further comprises at least one flange positioned on the concave body, the flange configured to define the concave recess.

10. The device of claim 9 wherein the flange is configured to contact the second implantable member when the convex body of the second implantable member is engaging the concave body of the first implantable member, thereby limiting a movement of the second impantable member.

11. The device of claim 1 further comprising at least one coupler recess configured to receive a coupling member therein, the coupling member configured to secure the concave body to the first anchor plate.

12. The device of claim 11 wherein the coupling member is selected from the group consisting of screws, bolts, pins, lock members, buttons, toggles, friction retention members, magnetic retention devices, and snap locks.

13. The device of claim 1 wherein the convex body is coupled to the second anchor plate using at least one device selected from the group consisting of coupling tracks, friction fit devices, slip-fit devices, locking members, magnetic coupling devices, twist locks, and snap-fit devices.

14. The device of claim 1 wherein the second anchor plate further comprises:

a base member having an interior surface;

a convex body receiver positioned on the interior surface of the base member, the convex body receiver configured to engage and retain a convex body therein; and

at least one anchoring element positioned on the periphery of the base member and configured to engage and be retained within an endplate of a vertebra.

15. The device of claim 14 wherein the convex body further comprises:

an arcuate body having a first surface and base;

at least one support wall in communication with the base; and

at least one attachment recess positioned on the base, the attachment recess configured to engage and be retained by the convex body receiver.

16. The devcie of claim 15 further comprising a convex body coupler positioned on the arcuate body.

17. The device of claim 16 further comprising an engagement surface detachbly coupled to the arcuate body.

18. The device of claim 15 further comprising at least one constraining flange positioned on the convex body, the constraining flange configured to contact the first implantable member when the convex body of the second implantable member is engaging the concave body of the first implantable member, thereby limiting a movement of the second impantable member.

19. The device of claim 1 wherein the convex body defines a longitudinal arc positioned along a longitudinal axis of the concave body.

20. The device of claim 1 wherein the convex body defines a lateral arc positioned along a lateral axis of the convex body.

21. The device of claim 1 wherein the convex body defines a longitudinal arc and a lateral arc.

22. The device of claim 1 wherein a radius of curvature of the convex body is-substantially constant.

23. The device of claim 1 wherein a radius of curvature of the convex body is variable.

24. The device of claim 1 further comprising at least one fastener receiver configured to receive a coupling member therein, the coupling member configured to secure the convex body to the second anchor plate.

25. The device of claim 24 wherein the coupling member is selected from the group consisting of screws, bolts, pins, lock members, buttons, toggles, friction retention members, magnetic retention devices, and snap locks.

26. The device of claim 1 further comprising a plurality of anchoring elements positioned on a periphery of the first anchor plate and the second anchor plate, the anchoring elmenets configured to engage an end plate of a vertebra.

27. The devie of claim 26 wherein the anchoring elements comprise a anchor body defining an anchor lumen and having a distal tip.

28. The device of claim 27 wherein the distal tip is pointed.

29. The device of claim 27 wherein the distal tip is atraumatic.

30. The device of claim 26 wherein at least one of the first anchor plate, the second anchor plate, and the anchoring elements comprise at least one surface discontinuity selected from the group consisting of therapeutc coatings, Ti-plasma coatings, fenestrations, pores, textures, and flutes.

31. The device of claim 1 wherein at least one of the first anchor plate, the second anchor plate, or both is plasma sprayed.

32. An intervertebral disc replacement system, comprising:

a first implantable member having a first anchor plate disposing a plurality of anchoring elements positioned on a periphery of the first anchor plate, and a concave body detachably coupled to the first anchor plate; and

a second implantable member having a second anchor plate disposing a plurality of anchoring elements positioned on a periphery of the second anchor plate, and a convex body detachably coupled to the second anchor plate, the convex body configured to engage the concave body in movable relation thereto.

33. A partial disc replacement device, comprising:

a first partial disc device having a first anchor plate disposing a plurality of anchoring elements positioned on a periphery of the first anchor plate, and a hemi concave body detachably coupled to the first anchor plate; and

a second partial disc device having a second anchor plate disposing a plurality of anchoring elements positioned on a periphery of the second anchor plate, and a hemi convex body detachably coupled to the second anchor plate, the hemi convex body configured to engage the hemi concave body in movable relation thereto.

34. A method of implanting an intervertebral disc prosthesis within the spine of a patient, comprising:

providing a disc space between two adjacent vertebrae;

positioning at least one intervertebral disc prosthesis within the disc space; and

engaging a cartilaginous end plate of a vertebra with at least one anchoring element positioned on the intervertebral disc prosthesis.

35. A method of implanting an intervertebral disc prosthesis within the spine of a patient, comprising:

providing a disc space between two adjacent vertebrae;

positioning a first implantable member having a concave recess formed therein within the disc space;

engaging a cartilaginous end plate of a vertebra with at least one anchoring element positioned on the first implantable member;

positioning a second implantable member having a convex body formed thereon within the disc space;

engaging a cartilaginous end plate of a vertebra with at least one anchoring element positioned on the second implantable member; and

engaging the concave body of the first implantable member within the convex body of the second implantable member.

36. A method of repairing an intervertebral disc prosthesis implanted within the body of a patient, comprising:

providing a disc space between two adjacent vertebrae, a first vertebra having a first implantable member implanted therein, the first implantable member having a concave body coupled thereto, and a second vertebra having a second implantable member implanted therein, the second implantable member having a convex body coupled thereto;

removing a coupling member coupling the concave body to the first implantable member;

removing the concave body from the first implantable member while leaving a first anchor plate implanted within the first vertebra;

positioning a replacement concave body on the first anchor plate;

coupling the replacement concave body to the first anchor plate with a coupling member; and

engaging the replacement concave body of the first implantable member within the convex body of the second implantable member.

38. The method of claim 36 wherein the vertebra is L2 to L5.

37. An anterior lateral method of accessing the vertebrae of a patient, comprising:

positioning a patient in a lateral decubitus position;

determining a position of a disc to be accessed within the spine;

forming an incision within the skin of a patient from a mid-axilliary line medially and laterally over a disc space to be repaired;

incising a subcutaneous tissue and underlying fascia;

bluntly dissecting an external oblique muscle;

bluntly dissecting a transversus;

bluntly dissecting-an internal oblique muscle;

bluntly dissecting a peritoneum posteriorly to the vertebrae;

bluntly dissecting a psoas anteriorly and posteriorly without injuring a lumbrosacral plexus or nerve root;

retracting the peritoneum medially and cephalad to the vertebra;

ligating segmented vessels; and

retracting medially and laterally the ligated segmented vessel to permit access to the vertebra.