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Fatigue-Life Computational Analysis for the Self-Expanding Endovascular Nitinol Stents

机译：自扩张血管内镍钛诺支架的疲劳寿命计算分析

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摘要

Self-expanding endovascular stents made of Nitinol (a Ni-Ti intermetallic compound possessing superelastic and shape-memory properties) are being widely used to treat a common circulatory problem in which narrowed arteries, primarily due to fatty deposits, hamper blood flow to the extremities (the problem commonly referred to as “peripheral artery disease”). The stents of this type unfortunately occasionally fail structurally (and, in turn, functionally) rendering the stenting procedure ineffective. The failure is most often attributed to the fatigue-induced damage since over its expected ten-year life span, the stent will normally experience 370-400 million pulsating-blood flow-induced loading cycles. Redesign/redevelopment of the stents using the conventional make-and-test approaches is quite expensive and time consuming and therefore is being increasingly complemented by computational engineering methods and tools. In the present study, advanced structural and fluid-structure interaction finite element computational methods are combined with the advanced fatigue-based durability analysis techniques to further enhance the use of the computational engineering analysis tools in the development of vascular stents with improved high-cycle fatigue life.
机译：由镍钛诺（一种具有超弹性和形状记忆特性的镍钛金属间化合物）制成的自膨胀血管内支架被广泛用于治疗常见的循环问题，该问题主要是由于脂肪沉积而使动脉变窄，阻碍了血液流向四肢。 （该问题通常称为“周围动脉疾病”）。不幸的是，这种类型的支架有时会在结构上（进而在功能上）失效，从而使支架手术无效。失效通常归因于疲劳引起的损坏，因为在其预期的十年使用寿命中，支架通常会经历370-400百万次脉动血流引起的加载循环。使用常规的制造和测试方法对支架进行重新设计/重新开发非常昂贵且耗时，因此越来越多地由计算工程方法和工具来补充。在本研究中，先进的结构和流体-结构相互作用有限元计算方法与先进的基于疲劳的耐久性分析技术相结合，以进一步增强计算工程分析工具在改善高周疲劳的血管支架开发中的应用生活。

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  • 来源
    《Journal of Materials Engineering and Performance》 |2012年第11期|p.2218-2230|共13页
  • 作者

    M. Grujicic; B. Pandurangan; A. Arakere; J. S. Snipes;

  • 作者单位

    Department of Mechanical Engineering, Clemson University, 241 Engineering Innovation Building, Clemson, SC, 29634-0921, USA;

    Department of Mechanical Engineering, Clemson University, 241 Engineering Innovation Building, Clemson, SC, 29634-0921, USA;

    Department of Mechanical Engineering, Clemson University, 241 Engineering Innovation Building, Clemson, SC, 29634-0921, USA;

    Department of Mechanical Engineering, Clemson University, 241 Engineering Innovation Building, Clemson, SC, 29634-0921, USA;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    fatigue-life prediction; Nitinol; stents;

    机译：疲劳寿命预测;镍钛诺;支架;

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