冠状动脉支架纵向拉伸变形行为有限元分析

发布时间：2018-03-12 14:26

本文选题：冠状动脉支架　切入点：纵向拉伸变形　出处：《材料导报》2017年10期 　论文类型：期刊论文

【摘要】：纵向强度是冠状动脉支架的一项重要力学性能,因强度不足而导致的支架纵向变形行为已成为经皮冠状动脉支架介入术最严重的并发症之一。运用有限元方法系统地分析了支架的扩张尺度、拉伸力的作用点位置和支撑单元之间的周向连接单元数量与形状对支架纵向拉伸变形行为的影响。结果显示,在支架结构设计参数中,连接单元的数量对支架纵向拉伸变形行为影响最大,增加连接单元的数量可以提高支架抵抗变形能力。连接单元形状对支架纵向拉伸变形行为影响次之,当支架的纵向变形位移为0.5mm且将连接单元形状由S型转换为L型时支架纵向强度可以提高50%。对于同一种连接单元类型的支架,扩张尺度越大的支架越容易发生纵向变形。同时,结果显示支架远端与近端端部比支架中部更容易发生纵向变形。合理调整支架的设计参数可以有效改善支架的纵向拉伸变形行为,所得结论有助于支架设计师优化支架的结构设计以降低支架纵向变形程度。
[Abstract]:Longitudinal strength is an important mechanical property of coronary stents. The longitudinal deformation of stent due to insufficient strength has become one of the most serious complications of percutaneous coronary stenting. The scale of stent expansion is systematically analyzed by finite element method. The effect of the position of the action point of the tensile force and the number and shape of circumferential connection units between the bracing elements on the longitudinal tensile deformation behavior of the bracket. The results show that, in the structural design parameters of the bracket, The number of connecting units has the greatest influence on the longitudinal tensile deformation behavior of the scaffolds, and the increase of the number of the connecting units can improve the resistance of the scaffolds to deformation, and the shape of the connecting units has the second effect on the longitudinal tensile deformation behavior of the scaffolds. When the longitudinal deformation displacement of the bracket is 0.5 mm and the shape of the connecting unit is converted from S-type to L-type, the longitudinal strength of the bracket can be increased by 50%. For the same type of bracket, the larger the expansion scale is, the more likely the longitudinal deformation will occur. The results show that longitudinal deformation is more likely to occur in the distal and proximal end of the support than in the middle of the support, and reasonable adjustment of the design parameters of the support can effectively improve the longitudinal tensile deformation behavior of the support. The conclusions are helpful to optimize the structural design of the scaffolds to reduce the longitudinal deformation of the scaffolds.
【作者单位】：江苏大学机械工程学院;
【基金】：国家自然科学基金(51305171) 江苏省自然科学基金(BK20130525) 江苏省高校自然科学基金(13KJB460006)
【分类号】：R318.08;R541.4

【相似文献】