EP0176728B1
Expired / Lapsed
EP
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Intervertebral-disc prosthesis
Assignee: Waldemar Link GmbH and Co KG
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Filing: 1985-08-17
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Granted: 1989-07-26
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Expires: 2005-08-17
Abstract
Abstract An intervertebral disc endoprothesis comprises two symmetrical, concave end plates with an intermediate convex spacing piece. The end plates and the spacing piece have a plane guide rim. The end plates either have an edge shoulder or an annular groove for a toroid provided on the spacing piece. Alternatively, the intervertebral disc endoprothesis comprises two asymmetric end plates and a spacing piece, however, the two areas of movement are offset by 90 DEG in relation to each other and are partial surfaces of a cylinder. In the third variation, the two symmetrical end plates are convex, the spacing piece is cylindrical as well as concave at the two ends and has a durable cover.
Inventors
- 👤 Karin Dr. med. Büttner-Janz
- 👤 Bernd Dipl.-Ing. Derr
- 👤 Klaus-Peter Dipl.-Ing. Erkel
- 👤 Hans-Joachim Dipl.-Jur. Helisch
- 👤 Kurt Doz. Dr. Sc. Med. Schellnack
- 👤 Roland Dipl.-Ing. Schumann
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 02:09
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/44; A61F2/442; A61F2/4425; A61F2/30721; A61F2/30724; A61F2002/30001; A61F2002/30003; A61F2002/3006; A61F2002/3008; A61F2002/30316; A61F2002/30329; A61F2002/30383; A61F2002/3039; A61F2002/30398; A61F2002/304; A61F2002/30535; A61F2002/30604; A61F2002/30621; A61F2002/30639; A61F2002/30642; A61F2002/30649; A61F2002/30663; A61F2/30767; A61F2/30771; A61F2002/30841; A61F2002/30878; A61F2002/30891; A61F2002/30892; A61F2002/30894; A61F2002/443; A61F2220/00; A61F2220/0025; A61F2250/00; A61F2250/0058; A61F2250/0096; A61F2250/0098; A61F2310/00; A61F2310/00005; A61F2310/00011; A61F2310/00179
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
103 words
Intervertebral disc endoprosthesis comprising two symmetrical end plates having a concave central part and anchoring projections (3) and having a biconvex spacing piece with the same radius of curvature as the concave central part, characterised in that the end plates have a ringshaped, flat guide edge (2) which is bent at its outer edge and is provided with a tooth system (3) continuously round the edge,, and in that the height adjustable spacing piece also has a ringshaped flat guide edge (5) which fits it and which is surrounded by an annular ring (6) with prevents slipping or sliding outfrom the end plates.
Claim 2
Dependent Claim
103 words
Intervertebral disc endoprosthesis comprising two symmetrical end plates having a concave central part and anchoring projections (3) and having a biconvex spacing piece with the same radius of curvature as the concave central part, characterised in that the end plates have a ringshaped, flat guide edge (2) which is bent at its outer edge and is provided with a tooth system (3) continuously round the edge,, and in that the height adjustable spacing piece also has a ringshaped flat guide edge (5) which fits it and which is surrounded by an annular ring (6) with prevents slipping or sliding outfrom the end plates.
Claim 3
Dependent Claim
30 words
Intervertebral disc endoprosthesis according to claim 1, characterised in that the outer edges of the end plates are bent at different heights corresponding to the curvature of the vertebral column.
Claim 4
Dependent Claim
38 words
Intervertebral disc endoprosthesis according to claim 1 or 2, characterised in that the flat guide edge (2) of the end plates is provided with opposing two-dimensional extensions (7) which are adapted to the curvature of the spinal column.
Claim 5
Dependent Claim
38 words
Intervertebral disc endoprosthesis according to one of claims 1 to 3, characterised in that the chamber between the end plate and spinal column is fillet with a disc (8) made from alloplas- tic material and/or with bone cement.
Claim 6
Dependent Claim
44 words
Intervertebral disc endoprosthesis according to one of claims 1 to 3, characterised in that the concave central part (1) and a ring groove (10) having a guide edge (2) placed between them are incorporated in a compact end plate (9) with lateral two-dimensional extensions.
References Cited (Backward Citations)
No citation records indexed.
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