| 摘要 |
<p>A biocompatible solid-solution alloy may be formed into any number of implantable medical devices. The solid-solution alloy comprises a combination of elements in specific ratios that make it magnetic resonance imaging compatible while retaining the characteristics required for implantable medical devices. The biocompatible solid-solution alloy is a cobalt-chromium alloy having substantially reduced iron, silicon, phosphorus and sulphur content. In one embodiment, an implantable medical device is formed from an improved, magnetic resonance compatible solid-solution alloy comprising chromium in the range from about 19 weight percent to about 21 weight percent, tungsten in the range from about 14 weight percent to about 16 weight percent, nickel in the range from about 9 weight percent to about 11 weight percent, manganese in the range from about 1 weight percent to about 2 weight percent, carbon in the range from about 0.05 weight percent to about 0.15 weight percent, iron in an amount not to exceed 0.3 weight percent, silicon in an amount not to exceed 0.4 weight percent, phosphorus in an amount not to exceed 0.04 weight percent, sulphur in an amount not to exceed 0.03 weight percent and the remainder cobalt.</p> |
