Valvular annuloplasty rings of a biocompatible low elastic modulus titanium-niobium-zirconium alloy
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United States of America Patent
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Oct 7, 1997
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N/A
app pub date -
Oct 12, 1995
filing date -
Dec 21, 1989
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Abstract
An annuloplasty ring of low elastic modulus Ti--Nb--Zr alloy to provide enhanced biocompatibility, hemocompatibility, flexibility and strength. Components of the annuloplasty ring can be surface hardened by oxygen or nitrogen diffusion or by depositing a tightly adherent, hard, wear-resistant, hemocompatible ceramic coating by physical vapor deposition and chemical vapor deposition. The Ti--Nb--Zr alloy can be used as a fabrication material for any annuloplasty ring component that either comes into contact with blood, thereby demanding high levels of hemocompatibility, or that is subject to microfretting, corrosion, or other wear such that a low elastic modulus metal with a corrosion-resistant, hardened surface would be desirable.
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