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US5755797: Intervertebral prosthesis and a process for implanting such a prosthesis

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Filing Information

Inventor(s) Walter Baumgartner ·
Assignee(s) Sulzer Medizinaltechnik AG ·
Attorney/Agent(s) Townsend and Townsend and Crew LLP ·
Primary Examiner Michael J. Milano ·
Application Number US8724937
Filing date 10/02/1996
Issue date 05/26/1998
Predicted expiration date 04/05/2014
U.S. Classifications 623/17  ·
International Classifications A61F 244  ·
Kind CodeA
International Classifications 62317;11 ·
Related U.S. Application DataThis is a Continuation of application Ser. No. 08/223,489 filed Apr. 5, 1994, the disclosure of which is incorporated by reference.
Foreign Priority EP93810291 - 04/21/1993 ·
13 Claims, No Drawings


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.

Independent Claims | See all claims (13)

  1. 1. An intervertebral prosthesis for an intervertebral disk having a cavity formed in a central region thereof, the prosthesis comprising an implant having at least three elastically deformable support members individually inserted into the cavity and individually positioned therein relative to each other to replace at least a part of the central region of the intervertebral disk, the support members each having a substantially fixed volume within the cavity, wherein at least one of the support members has an inner recess.
  2. 7. An intervertebral prosthesis for an intervertebral disk having a cavity formed in a central region thereof, the prosthesis comprising:an implant having at least three elastically deformable support members individually inserted into the cavity and individually positioned therein relative to each other to replace at least a part of the central region of the intervertebral disk, the support members each having a substantially fixed volume within the cavity; andan elongate, flexible support, the support members being mounted on the flexible support and spaced from each other by a minimum distance so that the support members are configured for successive and independent introduction into the cavity, the minimum distance between adjacent support members corresponding to a maximum outer dimension of at least one of the support members.
  3. 13.13. An intervertebral prosthesis for an intervertebral disk having a cavity formed in a central region thereof, the prosthesis comprising:an implant having at least three elastically deformable support members individually inserted into the cavity and individually positioned therein relative to each other to replace at least a part of the central region of the intervertebral disk, the support members each having a substantially fixed volume within the cavity; anda guide tube for introducing the support members into the cavity, wherein at least one of the support members comprises a guide surface that cooperates with the guide tube for positioning said one of the support members in a defined position in the cavity.

References Cited

U.S. Patent Documents

Document NumberAssigneesInventorsIssue/Pub Date
US3875595 Froning Apr 1975

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