发明名称 |
Non-oxidizing polymeric medical implant |
摘要 |
A medical implant made of polymeric material having an increased oxidation resistance is formed by a method including the steps of placing a resin powder in a sealed container. A substantial portion of the oxygen is removed from the sealed container by either a vacuum, an oxygen absorbent or by flushing with inert gas. The container is then repressurized with a gas such as nitrogen, argon, helium or neon so that long term storage may be possible. On use, the resin is transferred to a forming device which both melts and forms the resin in an oxygen reduced atmosphere to produce a polymeric raw material such as a rod or bar stock. The medical implant is then formed from this raw material annealed and sealed in an air-tight package in an oxygen reduced atmosphere. The implant is then radiation sterilized and thereafter annealed in the package for a predetermined time and temperature sufficient to form cross-links between any free radicals in neighboring polymeric chains.
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申请公布号 |
US5449745(A) |
申请公布日期 |
1995.09.12 |
申请号 |
US19940320705 |
申请日期 |
1994.10.07 |
申请人 |
HOWMEDICA INC. |
发明人 |
SUN, DEH-CHUAN;STARK, CASPER F. |
分类号 |
A61L27/00;A61L2/08;A61L15/60;A61L27/16;A61L29/04;A61L31/00;A61L31/04;A61L33/00;B29C35/08;B29C43/00;B29C43/16;C08F2/46;(IPC1-7):C08F6/26 |
主分类号 |
A61L27/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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