On the finite element modelling of balloon-expandable stents
On the finite element modelling of balloon-expandable stents
复制标题
DOI：
10.1016/j.jmbbm.2007.07.002
复制
发表时间：
2008-01-01
影响因子：
3.9
通讯作者：
Sasaki, Katsuhiko
中科院分区：
文献类型：
--
作者：
Jua, Feng;Xia, Zihui;Sasaki, Katsuhiko
有限元法已广泛应用于支架的力学和生物力学性能分析。在几何学上，闭孔支架是多个重复单元的组装件，并且在纵向和周向方向上都表现出周期性。本文的目的是研究用于支架分析的有限元模型。为此，三个模型，分别称为面板，RUC（重复单元格）和RUC（重复单元格与自由端）模型，提出了合并旋转对称，周期性和自由边缘条件。所提出的模型被应用到分析的Palmaz-Schatz和正弦型支架。Panel模型将数值模型的尺寸从完整、半个或四分之一支架减小到一个条带，而不会损失计算精度。RUC模型对支架的内部（两端除外）给出了令人满意的结果。本文首次描述的RUC模型为支架的内部和远端提供了准确的结果。此外，它还可以预测公知的“狗骨头”现象，其中球囊在支架的两端过度膨胀。(c)2007爱思唯尔有限公司保留所有权利。
Finite element method (FEM) has been extensively applied in the analyses of mechanical and biomechanical properties of stents. Geometrically, a closed-cell stent is an assembly of a number of repeated unit cells and exhibits periodicity in both longitudinal and circumferential directions. The objective of this paper is to study the FEM models for the analysis of stents. To this end, three models, termed respectively as the Panel, RUC (repeated unit cell) and RUC, (repeated unit cell with a free end) models, are proposed incorporating rotationally symmetrical, periodic and free edge conditions. The proposed models are applied to the analysis of stents of Palmaz-Schatz and sinusoidal types. The Panel model reduces the size of the numerical model from the full, half or quarter stent to a strip of it without losing the computational accuracy. The RUC model gives satisfactory results for the inner part of the stent except for the two ends. The RUC model, described here for the first time, provides accurate results for both the inner part and the distal ends of the stent. in addition, it allows the prediction of the well-known phenomenon of "dog-boning", in which the balloon is excessively expanded at the two ends of the stent. (c) 2007 Elsevier Ltd. All rights reserved.