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HEAT TREATMENT FOR COLD WORKED NITINOL TO IMPART A SHAPE SETTING CAPABILITY WITHOUT EVENTUALLY DEVELOPING STRESS-INDUCED MARTENSITE
HEAT TREATMENT FOR COLD WORKED NITINOL TO IMPART A SHAPE SETTING CAPABILITY WITHOUT EVENTUALLY DEVELOPING STRESS-INDUCED MARTENSITE
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机译:在没有明显发展应力诱发马氏体的情况下对冷镍进行热处理,以提高形状定型能力
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摘要
Cold worked nickel-titanium alloys that have linear pseudoelastic behavior without a phase transformation or onset of stress-induced martensite as applied to a medical device having a strut formed body deployed from a sheath is disclosed. In one application, am embolic protection device that employs a linear pseudoelastic nitinol self-expanding strut assembly with a small profile delivery system for use with interventional procedures is disclosed. The expandable strut assembly is covered with a filter element and both are compressed into a restraining sheath for delivery to a deployment site downstream and distal to an interventional procedure. Once at the desired site, the restraining sheath is retracted to deploy the embolic protection device, which captures flowing emboli generated during the interventional procedure. Linear pseudoelastic nitinol is used in the medical device as distinct from non-linear pseudoelastic (i.e., superelastic) nitinol.
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