公开(公告)号：US20100331946A1

公开(公告)日：2010-12-30

申请号：US12873191

申请日：2010-08-31

申请人： BRET A. DOOLEY ,  CHRISTOPHER C. LASLEY ,  MICHAEL R. MITCHELL ,  ROBERT R. STEELE ,  ERIC M. TITTELBAUGH

发明人： BRET A. DOOLEY ,  CHRISTOPHER C. LASLEY ,  MICHAEL R. MITCHELL ,  ROBERT R. STEELE ,  ERIC M. TITTELBAUGH

IPC分类号： A61F2/82 ,  A61F2/01

CPC分类号： A61F2/82 ,  A61B2017/00867 ,  A61C2201/007 ,  A61L31/022 ,  A61L31/121 ,  A61L31/14 ,  A61L2400/16 ,  C22F1/006

摘要： Articles made of shape memory alloys having improved fatigue performance and to methods of treating articles formed from shape memory alloy materials by pre-straining the articles (or desired portions of the articles) in a controlled manner so that the resultant articles exhibit improved fatigue performance. The shape memory articles are preferably medical devices, more preferably implantable medical devices. They are most preferably devices of nitinol shape memory alloy, most particularly that is superelastic at normal body temperature. The pre-straining method of the present invention as performed on such articles includes the controlled introduction of non-recoverable tensile strains greater than about 0.20% at the surface of a desired portion of a shape memory alloy article. Controlled pre-straining operations are performed on the shape-set nitinol metal to achieve non-recoverable tensile strain greater than about 0.20% at or near the surface of selected regions in the nitinol metal article. The pre-straining operations result in a significant increase in fatigue life of the selectively treated regions and an overall improvement in the fatigue performance of the device.

摘要翻译： 由具有改善的疲劳性能的形状记忆合金制成的制品以及通过以受控的方式预制品（或制品的所需部分）来处理由形状记忆合金材料形成的制品的方法，使得所得制品表现出改进的疲劳性能。 形状记忆物品优选是医疗装置，更优选可植入医疗装置。 它们最优选为镍钛诺形状记忆合金的装置，最特别的是在正常体温下是超弹性的。 对这种制品进行的本发明的预应变方法包括在形状记忆合金制品的期望部分的表面处控制引入大于约0.20％的不可恢复的拉伸应变。 在形状组成的镍钛诺金属上进行受控的预应变操作，以在镍钛诺金属制品的选定区域的表面处或附近实现大于约0.20％的不可恢复拉伸应变。 预应变操作导致选择性处理区域的疲劳寿命显着增加，并且整体提高了设备​​的疲劳性能。