Patent · US Expired

Intervertebral disc endoprosthesis

US5401269A · kind A · utility

1,022Cited by

3References

18Claims

0Family size

Assignee

WALDEMAR LINK GmbH & Co. KG · DE

Inventors

Karin Büttner-Janz · Berlin, DE
Arnold Keller · Kayhude, DE
Jean-Philippe Lemaire · Chevigny-Saint-Sauveur, FR

Key dates

Filing date	Mar 10, 1993
Grant date	Mar 28, 1995
Priority date	—
Expiry date	Mar 10, 2013

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S606/91
WIPO fieldMedical technology
WIPO sectorInstruments

Abstract

Intervertebral disc endoprosthesis with two prosthesis plates which are to be connected to the end plates of the relevant vertebrae, and with a prosthesis core which cooperates with at least one prosthesis plate via an articular surface permitting a rotational movement around the vertical axis, In order indeed to make possible a rotational movement around the vertical axis but to oppose this movement by a resistance, the articular surface forms curved arches of different average radius in the median section and in the frontal section. The radius of curvature in the sagittal section is expediently less than in the frontal section. To avoid excessive twisting it is possible to provide stops on the prosthesis plates and on the prosthesis core. These are designed, for example, as ribs and grooves which run in the median plane.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.