Knee joint endoprosthesis

US4770663A · kind A · utility

Inventors

• Lothar Hanslik · Berlin, DE
• Joachim E. Henssge · Lübeck, DE

Key dates

• Filing date: Jul 23, 1986
• Grant date: Sep 13, 1988
• Expiry date: Jul 23, 2006

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61F2/3836
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

The invention relates to knee joint endoprosthesis consisting of a femur part provided with two skid surfaces leaving a free space between each other, said surfaces being connected with each other in front and having their curvature increasing from the front towards the rear and being curved also on planes perpendicular to said curvature; a tibia part having two surfaces on which the skid surfaces ride in a sliding manner, with an elevation being disposed between said two surfaces; and of artificial connecting means for keeping the two parts of the prosthesis together. The invention lies in the fact that the outer surface (2) of the tibia part is largely plane on a center sectional plane from the front to the rear; that the inner surface (1) of the tibia part is slightly concave on a center sectional plane from the front to the rear; that the slope (6) of the elevation (3; 4) to the outer surface (2) is flatter than the slope (5) of the elevation (3; 4) to the inner surface (1); and that the parts of the prosthesis are kept together by two ending, non-flexible bands, of which a first band extends from the front center of the tibia part upwardly and on the outside and inclined rearw…