Medical Prosthetic Devices Presenting Enhanced Biocompatibility and Wear Resistance, Based On Colbalt Alloys and Process for Their Preparation
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United States of America Patent
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Issued Date -
Oct 23, 2008
app pub date -
Oct 6, 2005
filing date -
Oct 8, 2004
priority date (Note) -
Abandoned
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Abstract
Medical prosthetic devices and in particular femoral head and/or acetabular cup of articular prostheses, made out of a cobalt alloy are submitted to a surface modification in order to obtain the formation of a thin surface layer constituted by Co--Ta and or Co--Nb intermetallic compounds, with the aim of inducing to the prosthetic device enhanced characteristics of biocompatibility, low metal ion release, higher hardness and wear resistance. The process of surface modification is performed by a treatment of the alloy in a molten salt mixture containing a tantalum halide, without applying any electrical field.
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