Surface and near surface hardened medical implants

Details Surface and near surface hardened medical implants Surface and near surface hardened medical implants

A - Human Necessities

61

L

A61L 27/06 (2006.01) A61L 27/00 (2006.01) A61L 27/02 (2006.01) A61L 31/02 (2006.01) C22C 14/00 (2006.01) A61F 2/00 (2006.01)

Patent

CA 2130244

Surface and near surface hardened medical implants are provided. These implants are fabricated from titanium alloys that contain an amount of zirconium sufficient to permit the formation of a significant amount of zirconium oxide at the surface of the implant to cause surface hardening. Further, the zirconium-containing titanium alloy implants are characterized in having an alloy core with an oxygen-rich layer surrounding the core, and a surface layer, overlying the oxygen-rich layer, including mixed oxides of the metals present in the alloy. A zirconium-rich interface may sometimes be present between the oxygen-rich layer and the mixed-oxide surface layer. The method of producing these surface hardened implants includes the steps of heating the implant in an oxygen containing environment at a temperature sufficient to allow oxygen to diffuse to and react with the implant surface and near surface.

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