The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 12, 1989
Filed:
Aug. 11, 1988
Gunther Rehder, Kiel, DE;
Friedrichsfeld GmbH Keramik und Kunststoffwerke, Mannheim, DE;
Abstract
An endoprosthesis for a knee joint comprising a femur part (6), a tibia part (8), and a middle part (18) which is articulated on the femur part (6) by a pin (14). The middle part (18) is pivotable with respect to the tibia part (8) about a centering pin (20), and a stop is pivoted which is dependent on the flexion angle. A bearing part (54), acting as artificial meniscus, is arranged between the femur part (6) and the middle part (18), and has a first guide element (56) coaxial to the flexion axis and in engagement with the bearing member (58) of the femur part (6). The bearing part (54) is displaceable with respect to the middle part (18) and also comprises a second guide element (60) in engagement with a guide track (62) of the middle part (18); the pin (14) is arranged eccentric to the bearing member (58), and movement of the flexion axis is forced along an evolute curve. The invention avoids localized load peaks while accomplishing the physiological functions of the knee joint during movement and load.