Treatments to reduce frictional wear between components made...

Details Treatments to reduce frictional wear between components made... Treatments to reduce frictional wear between components made...

C - Chemistry, Metallurgy

23

C

C23C 14/06 (2006.01) A61F 2/30 (2006.01) A61F 2/46 (2006.01) A61L 27/00 (2006.01) A61L 27/16 (2006.01) A61L 27/30 (2006.01) A61L 27/50 (2006.01) A61L 33/02 (2006.01) B29C 71/00 (2006.01) C08J 7/02 (2006.01) C23C 14/24 (2006.01) C23C 16/02 (2006.01) C23C 16/26 (2006.01) C23C 16/48 (2006.01) C23C 28/00 (2006.01) A61F 2/00 (2006.01) A61F 2/02 (2006.01) A61F 2/24 (2006.01)

Patent

CA 2186261

The present invention provides methods for modifying surfaces of metal alloy and/or UHMWPE (ultra-high molecular weight polyethylene), preferably surfaces which are frictionally engaged, e.g., in an orthopaedic implant. The methods reduce the coefficient of friction of the metal alloy component, reduce the shearing of fibrils from the UHMWPE component. One method involves solvent immersion of the UHMWPE component to remove short chains of polyethylene at or near its surface, and to swell and toughen its subsurface. Another method also involves firmly coating the surface of the metal alloy component with an adherent layer of diamond-like carbon ("DLC") by creating a metal-silicide interface at the surface of the metal alloy to permit firmer adhesion of DLC. Although these methods are particularly useful in orthopaedic applications, they can also be used to treat similar components used in other applications.

Procédés de modification de surfaces d'alliage métallique et/ou de polyéthylène de poids moléculaire très élevé (UHMWPE), de préférence des surfaces qui sont en contact à friction, dans un implant orthopédique, par exemple. Ces procédés permettent de réduire le coefficient de friction de l'élément en alliage métallique ainsi que le cisaillement des fibrilles de l'élément en UHMWPE. L'un des procédés consiste à immerger dans un solvant l'élément en UHMWPE afin d'en éliminer les chaînes courtes de polyéthylène à sa surface ou à proximité de celle-ci, de faire gonfler et de consolider la surface sous-jacente. Un autre procédé consiste à appliquer de manière résistante une couche adhésive de carbone du type diamant (DLC) sur la surface de l'élément en alliage métallique par création d'une interface métal/siliciure à la surface de l'alliage métallique en vue de renforcer l'adhérence du DLC. Bien que ces procédés conviennent particulièrement à des applications orthopédiques, ils peuvent également être utilisés pour traiter des éléments analogues dans le cadre d'autres applications.

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