Patent ID: 6126695
Filing Date: 2000-10-03
Classification: A61F,B24B

Abstract:
Artificial joint, comprising a bearing shell which has a concave spherical surface A with a center M.sub.s, and a joint ball which has a convex spherical surface B with a center M.sub.K, which is rotationally symmetrically arranged with respect to a mounting axis D in the direction of a neck of an artificial joint shaft connected with the joint ball, the bearing shell and the joint ball comprising a wear-resistant metallic material; the surface A having an average radius R.sub.m and the surface B having an average radius r.sub.m, with their difference amounting to 35 .mu.m<R.sub.M -r.sub.m <85 .mu.m; wherein the shape error of the surface A amounts to less than .+-.7.5 .mu.m over an angle 90.degree.>.alpha.<180.degree.; wherein the shape error of the surface B amounts to less than .+-.2 .mu.m over an angle .beta.>140.degree.; wherein the joint ball is continued outside the area B by a set-back surface C which has a distance to the center M.sub.K which is less than that of surface B, while a roughness of the surface A corresponds to a value R.sub.a <0.08 .mu.m and a roughness of the surface B corresponds to a value R.sub.a <0.08 .mu.m.