A - Human Necessities – 61 – F
Patent
A - Human Necessities
61
F
A61F 2/30 (2006.01) A61L 27/04 (2006.01) A61L 27/30 (2006.01) A61F 2/00 (2006.01) A61F 2/32 (2006.01) A61F 2/34 (2006.01) A61F 2/36 (2006.01) A61F 2/38 (2006.01) A61F 2/40 (2006.01) A61F 2/42 (2006.01) A61F 2/46 (2006.01)
Patent
CA 2451612
An orthopaedic joint prosthesis comprises a first joint component and a second joint component. Each of the components is formed from a metal body and has a bearing surface which engages the corresponding bearing surface of the other component when the prosthesis is implanted. Each of the metal bodies has a ceramic coating applied to it at the bearing surface, the coating comprising a chromium compound and being at least about 5 µm thick. The coatings which can be different, for example so that the difference between the hardnesses of the materials of the coatings which are applied to the first and second joint components is less than about 5000 MPa. Preferably, the metal from which at least one of the first and second joint components is made has a modulus of at least about 150 GPa.
L'invention porte sur une prothèse articulaire orthopédique comprenant un premier et un second composant. Chacun de ces composant est formé dans un corps métallique et comporte une surface de support qui vient en contact avec la surface de support correspondante de l'autre composant lorsque la prothèse est implantée. Sur la surface de support de chaque corps métallique est appliqué un revêtement céramique, ce revêtement comprenant un composé de chrome et ayant au moins une épaisseur d'environ 5 µm. Les revêtements peuvent être différents de sorte que, par exemple, la différence entre la dureté des matériaux de revêtement appliqués sur les premier et second composants soit inférieure à environ 5000 MPa. De préférence, le métal dans lequel est conçu au moins un des premier et seconds composants a un module d'au moins environ 150 GPa.
Farrar Richard
Fisher John
Hatto Peter
Depuy International Limited
Ionbond Limited
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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