镍钛丝断裂原因分析  

Cause Analysis on Fracture of Nickel Titanium Wires

作　　者：施小立 祁凤君 穆盈 廖经友 刘艳文 李晓玲 SHI Xiaoli;QI Fengjun;MU Ying;L;LIU Yanwen;LI Xiaoling(Shenzhen Advanced Medical Services Co.,Ltd.,Shenzhen 518057,China)

机构地区：[1]深圳市领先医疗服务有限公司,深圳518057

出　　处：《理化检验（物理分册）》2018年第11期829-832,共4页Physical Testing and Chemical Analysis(Part A:Physical Testing)

摘　　要：某镍钛合金植入类医疗器械产品里的镍钛丝在生产过程中发生断裂,采用化学成分分析、力学性能试验、洁净度测试、断口宏微观分析以及能谱分析等方法对其断裂原因进行了分析。结果表明:镍钛丝的加工应力未得到很好的消除,加之编织模棒和热缩管引入了腐蚀介质,二者共同作用导致该镍钛丝发生了应力腐蚀断裂。The nickel titanium wires in a nickel titanium alloy implantable medical device product fractured during production.The fracture reasons were analyzed by chemical composition analysis,mechanical property test,cleanliness test,macro and micro fracture analysis,energy spectrum analysis and so on.The results show that the machining stress of the nickel titanium wires had not been eliminated well,and the corrosive medium introduced by the braiding rod and the heat shrinkable tube.These two factors together caused the stress corrosion fracture of the nickel titanium wires.

关 键 词：植入类医疗器械 镍钛丝 断裂 应力腐蚀 

分 类 号：TG115.2[金属学及工艺—物理冶金]