Artificial joint, in particular an artificial hip joint

Details Artificial joint, in particular an artificial hip joint Artificial joint, in particular an artificial hip joint

A - Human Necessities

61

F

A61F 2/32 (2006.01) A61F 2/30 (2006.01) B24B 11/06 (2006.01) B24B 19/02 (2006.01) A61F 2/00 (2006.01) A61F 2/34 (2006.01) A61F 2/36 (2006.01) A61F 2/46 (2006.01)

Patent

CA 2251334

With the invention, a geometry is described which makes it possible to use similar, wear-resistant, metallic materials such as PROTASUL 21 WF for a bearing shell (1) and a joint ball (2) in a spherical bearing without micro-weldings and without excessive wear arising, while other properties such as toughness, stability of shape and elasticity can be exploited for the function. Micro-weldings of the similar metallic materials are largely prevented by a suitable relationship between the average radii R m, r m of the bearing surfaces A and B as well as of the permissible deviations (12, 13) in shape and of the permissible roughness of the bearing surfaces.

L'invention concerne une articulation artificielle dont la géométrie permet l'utilisation de matières métalliques du même type telles que PROTASUL 21 WF, pour former une coquille de coussinet (1) et une boule d'articulation (2) dans un coussinet sphérique, sans que se produisent des micro soudures et une usure excessive, tout en permettant de tirer profit d'autres propriétés telles que la ténacité, la stabilité dimensionnelle et l'élasticité, pour le fonctionnement de cette articulation. Grâce à une relation adaptée entre les rayons moyens Rm rm des surfaces d'appui A et B, les écarts de forme admissibles (12, 13) et la rugosité admissible des surfaces d'appui, des micro soudures des matières métalliques du même type sont empêchées dans une large mesure.

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