发明名称 |
Fatigue-Resistant Nitinol Instrument |
摘要 |
A fatigue-resistant Nitinol instrument has a working portion in the deformed monoclinic martensitic state and an austenite finish temperature in the range of 40° to 60° C. Because the operating environment of the instrument is about 37° C., the working portion remains in the monoclinic martensitic state during its use. The relatively high austenite finish temperature and fatigue resistance is achieved by subjecting the nickel-titanium alloy to a final thermal heat treat in a temperature range of about 410° to 440° C. while the nickel-titanium alloy is under constant strain of about 3 to 15 kg. Further, the high austenite finish temperature is achieved without subjecting the alloy to thermal cycling to produce shape memory. Additionally, there are no intermediate processing steps occurring between obtaining a finished diameter of the wire or blank through cold working and the final thermal heat treat under constant strain. |
申请公布号 |
US2014242543(A1) |
申请公布日期 |
2014.08.28 |
申请号 |
US201414269968 |
申请日期 |
2014.05.05 |
申请人 |
Johnson William B. |
发明人 |
Johnson William B. |
分类号 |
B21K5/02;A61C5/02 |
主分类号 |
B21K5/02 |
代理机构 |
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代理人 |
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主权项 |
1. An instrument comprising:
a working portion composed of a nickel-titanium alloy and configured for use in the human body, the working portion having an austenite finish temperature in the range of 40° to 60° C., the working portion being in a deformed monoclinic martensitic state. |
地址 |
Tulsa OK US |