Intervertebral device and method of use

• US 8,632,594 B2
• Filed: 08/01/2006
• Issued: 01/21/2014
• Est. Priority Date: 03/30/2002
• Status: Expired due to Fees

• Current Assignee: IMDS LLC
• Original Assignee: IMDS Corporation, Infinity Orthopedics Limited
• Inventors: Williams, Lytton A., Wong, Sui-Kay
• Primary Examiner(s): Sweet, Thomas J
• Assistant Examiner(s): MILLER, CHERYL L
• Application Number:
  US11/461,509
• Publication Number:
  US 20070010887A1
• Time in Patent Office: 2,730 Days
• Field of Search: 623 1711- 1716
• US Class Current: 623/17.15
• 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. A method of revising an intervertebral implant on a spine comprising first and second vertebral bodies adjacent to an intervertebral space, the intervertebral implant comprising a first anchor plate secured to the first vertebral body, a second anchor plate secured to the second vertebral body, and a first intermediate component positioned at least partially between the first and second anchor plates, the first intermediate component comprising a concave body attached to the first anchor plate, the concave body having a concave recess shaped to articulate with a convex surface to permit relative motion between the first and second anchor plates, the method comprising:

detaching the concave body from the first anchor plate without removing the first anchor plate from the first vertebral body; and

removing the concave body from the intervertebral space.

2. The method of claim 1, wherein the intervertebral implant further comprises an anchoring element positioned on the first anchor plate to enhance securement of the first anchor plate to the first vertebral body by penetrating the first vertebral body, wherein detaching the concave body from the first anchor plate comprises avoiding withdrawing the first anchoring element from penetration of the first vertebral body.

3. The method of claim 2, wherein the first anchoring element is attached to the first anchor plate independently of any threaded connection.

4. The method of claim 3, wherein the first anchoring element is formed as a single piece with the first anchor plate.

5. The method of claim 2, wherein the first anchoring element comprises a sharp point.

6. The method of claim 1, wherein the intervertebral implant further comprises a coupling member, wherein detaching the concave body from the first anchor plate comprises actuating the coupling member to permit removal of the concave body from the first anchor plate without requiring access to a bone-engaging surface of the first anchor plate.

7. The method of claim 6, wherein the coupling member comprises a set screw, wherein actuating the coupling member comprises disengaging threads of the set screw from threads of the first anchor plate.