Künstliches Gelenk, insbesondere Endoprothese zum Ersatz natürlicher Gelenke

摘要

An artificial joint, in particular an endoprosthesis for replacing natural joints, consists of at least two artificial joint parts with curved articulation surfaces. An arc-shaped contact line (k) designed on each of the articulation surfaces forms a section of a contact circle with a middle point (M) that lies in a plane. The articulation surfaces are matched in such a way that the contact lines (k) can roll on each other and their axes (m) that extend through middle points (M) may cross each other at a crossing point (S) perpendicularly to the plane of the contact circles. Regulating surfaces (3, 4) made up of a plurality of straight contact lines (s) are shaped on one side of the contact lines (k). The straight contact lines (s) lie on momentary connecting lines (s) between the momentary contact points (K) created when the contact lines (k) roll upon each other and the momentary crossing points (S) that result when the contact lines (k) swivel at an angular speed ( OMEGA ) around a common tangent (t) of the contact lines (k) through the momentary contact points (K).