Finite element comparison of performance related characteristics of balloon expandable stents
Finite element comparison of performance related characteristics of balloon expandable stents
复制标题
球囊扩张支架性能相关特性的有限元比较
DOI：
10.1080/10255840601086234
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发表时间：
2007
影响因子：
1.6
通讯作者：
P. E. McHugh
中科院分区：
文献类型：
--
作者：
E. Donnelly;M. Bruzzi;Thomas Connolley;P. E. McHugh
心血管支架通常由316 L不锈钢制成，并使用球囊扩张在狭窄的动脉病变内展开。展开涉及使球囊膨胀并使支架塑性变形，直到获得所需的直径。这种塑性变形在支架中引起静态应力，该应力将在器械的使用寿命期间保持。为了确定这些应力，已经创建了几何形状不同的市售球囊可扩张支架的单位单元的有限元模型，并且已经模拟了展开和弹性回缩。在这项工作中，比较了各种支架几何形状与展开和回缩相关的残余应力，旨在为支架的疲劳载荷建立适当的初始应力状态。评价了收缩压/舒张压引起的支架中的最大、最小和平均应力，以及径向和纵向回缩等性能指标。
Cardiovascular stents are commonly made from 316L stainless steel and are deployed within stenosed arterial lesions using balloon expansion. Deployment involves inflating the balloon and plastically deforming the stent until the required diameter is obtained. This plastic deformation induces static stresses in the stent, which will remain for the lifetime of the device. In order to determine these stresses, finite element models of the unit cells of geometrically different, commercially available balloon expandable stents have been created, and deployment and elastic recoil have been simulated. In this work the residual stresses associated with deployment and recoil are compared for the various stent geometries, with a view to establishing appropriate initial stress states for fatigue loading for the stents. The maximum, minimum, and mean stresses induced in the stent due to systolic/diastolic pressure are evaluated, as are performance measures such as radial and longitudinal recoil.