implantable kunstlicher gelenkersatz

摘要

1472311 Hip-joint prostheses FELDMUHLE ANLAGENUND PRODUKTIONS GmbH 11 April 1974 [12 April 1973 (2)] 16118/74 Heading A5R A hip-joint prosthesis comprises a socket member 14 having a generally concave-hemispherical front surface and a rear surface 3 provided with a screw thread 4" whereby it may be screwed self-tappingly into a patient's ilium 13, and a cooperating ball member 10 having a generally part-spherical front surface and a recessed rear surface shaped to fit over the machined head 18 of the patients' femur 1, the recess having a screw thread 4' whereby the ball-member may be screwed self-tappingly onto the head of the femur, at least the superficial parts of the ball and socket members consisting of sintered aluminium oxide having a purity greater than 99%, a density greater than 3.9 g/cm3 and a mean grain size below 10 Ám. The aluminium oxide has been sintered above 1700‹C. The ball member and/or the socket member is/are internally reinforced by metal. The socket member may accommodate one or more countersunk screws 15.