Process for implanting an invertebral prosthesis

• US 5,702,454 A
• Filed: 05/29/1996
• Issued: 12/30/1997
• Est. Priority Date: 04/21/1993
• Status: Expired due to Term

• Current Assignee: Zimmer GmbH (Zimmer Biomet Holdings, Inc.)
• Original Assignee: Sulzer Orthopaedie AG
• Inventors: Baumgartner, Walter
• Primary Examiner(s): BRITTINGHAM, DEBRA
• Application Number:
  US08/657,446
• Time in Patent Office: 580 Days
• Field of Search: 623/11, 623/17, 623/18, 623/16, 606/61, 128/898
• US Class Current: 128/898
• CPC Class Codes: A61F 2/441 made of inflatable pockets or chambers filled with fluid, e.g. with hydrogel
• 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 2/4611 of spinal prostheses
• CPC Class Codes: A61F 2002/3008 radio-opaque, e.g. radio-opaque markers
• CPC Class Codes: A61F 2002/30242 spherical
• CPC Class Codes: A61F 2002/30462 retained or tied with a rope, string, thread, wire or cable
• 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 2002/30588 filled with solid particles
• CPC Class Codes: A61F 2002/30593 hollow
• CPC Class Codes: A61F 2002/4415 elements of the prosthesis being arranged in a chain like manner
• CPC Class Codes: A61F 2002/444 for replacing the nucleus pulposus
• CPC Class Codes: A61F 2002/4627 with linear motion along or rotating motion about the instrument axis or the implantation direction, e.g. telescopic, along a guiding rod, screwing inside the instrument
• CPC Class Codes: A61F 2220/0075 sutured, ligatured or stitched, retained or tied with a rope, string, thread, wire or cable
• CPC Class Codes: A61F 2230/0071 spherical
• CPC Class Codes: A61F 2250/0098 radio-opaque, e.g. radio-opaque markers
• CPC Class Codes: A61F 2310/00131 Tantalum or Ta-based alloys
• CPC Class Codes: Y10S 606/91 Polymer
• CPC Class Codes: Y10S 623/908 Bone

Abstract

An implant consisting of several support members (7), which are produced from an elastic plastic, is provided as a replacement for a part, which is no longer capable of bearing loads, of the core region of an intervertebral disk (3). The support members (7) are inserted one after the other into a central cavity (5) constructed in the core region by means of a tube (6) passing through an outer annular region (4) of the intervertebral disk (3) until said cavity is filled. When the cavity (5) becomes clogged with the filling members (7), they become deposited on the boundary walls of the annular region (4) and against one another and are elastically deformed under stress. Accordingly a universal implant which can be adapted to cavities (5) of any shape, and which forms a relatively compact, elastic support structure, can be achieved.

Claims

1. A method for implanting an intervertebral prosthesis comprising:

forming a cavity within an intervertebral disc;

providing at least three elastically deformable support members;

individually introducing each of the support members into the cavity of the intervertebral disc; and

individually positioning each of the support members within the cavity of the intervertebral disc.

2. The method of claim 1 further comprising forming an opening through an outer wall of the intervertebral disc.

3. The method of claim 2 wherein the forming step comprises removing tissue from a core of the intervertebral disc to form the cavity therein.

4. The method of claim 2 further comprising closing the opening after the support members have been positioned within the central cavity.

5. The method of claim 1 wherein the introducing step is carried out by forming an opening in an outer wall of the intervertebral disc, introducing a distal end of a hollow tube through the opening and delivering the support members through the tube into the cavity.

6. The method of claim 5 further comprising forming a second opening in the outer wall of the intervertebral disc and introducing a distal end of the second hollow tube through the second opening.

7. The method of claim 6 further comprising introducing a viewing scope through the distal end of the second hollow tube and monitoring the cavity during the support member introducing step.

8. The method of claim 6 further comprising introducing an instrument through the distal end of the second hollow tube and positioning at least one of the support members within the cavity with the instrument.

9. The method of claim 5 further comprising:

introducing a thin membrane into the cavity, the membrane defining an inner cavity and having an opening aligned with the distal end of the tube; and

delivering the support members through the tube and the membrane opening into the inner cavity of the membrane.

10. The method of claim 5 wherein the support members are mounted and spaced on an elongate flexible support, the method further comprising advancing the support through the tube and delivering the support members into the cavity one at a time.

11. A method for implanting an intervertebral prosthesis comprising:

forming a cavity within an intervertebral disc;

providing at least three elastically deformable support members; and

sequentially introducing each of the support members one at a time into the cavity of the intervertebral disc.