文献类型：期刊文献

英文题名：Numerical investigations of the mechanical properties of braided vascular stents

作者：Fu, Wenyu[1,2];Xia, Qixiao[1];Yan, Ruobing[3];Qiao, Aike[4]

第一作者：Fu, Wenyu;付文宇

通讯作者：Qiao, AK[1]

机构：[1]Beijing Union Univ, Coll Mech & Elect Engn, Beijing 100020, Peoples R China;[2]Beijing Univ Technol, Coll Architecture & Civil Engn, Beijing 100124, Peoples R China;[3]Univ Ottawa, Dept Civil Engn, Ottawa K1N 6N5, ON, Canada;[4]Beijing Univ Technol, Coll Life Sci & Bioengn, Beijing 100124, Peoples R China

第一机构：北京联合大学机器人学院

通讯机构：[1]corresponding author), Beijing Univ Technol, Coll Life Sci & Bioengn, Beijing 100124, Peoples R China.

年份：2018

卷号：29

期号：1

起止页码：81-94

外文期刊名：BIO-MEDICAL MATERIALS AND ENGINEERING

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000425302200007)】；

基金：This work was supported by the General Program of Science and Technology Development Project of the Beijing Municipal Education Commission of China (KM201711417011), Major Project of Science and Technology of Beijing Municipal Education Commission and Type B Project of Beijing Natural Science Foundation (KZ201710005007) and the National Natural Science Foundation of China (11772015).

语种：英文

外文关键词：Braided stent; finite element method; radial stiffness; longitudinal flexibility; parametric analysis

摘要：BACKGROUND: Braided stents, such as Pipeline Embolization Device (PED; ev3 Neurovascular, Irvine, CA, USA), are commonly used to treat cerebral aneurysms. However, little information is available on the compression and bending characteristics of such stents. OBJECTIVE: This paper investigates how geometrical parameters of braided stents influence their radial compression and bending characteristics. METHODS: Six groups of braided stent models with different braiding angles, numbers of wires and wire diameters are constructed. Parametric analyses of these models are conducted using Abaqus/Explicit software. The numerical results of a finite element analysis are validated by comparison with data of theoretical analysis. RESULTS: The results show that the radial stiffness is not uniform along the longitudinal direction of the stent. When the braiding angle increases from 30 degrees to 75 degrees, the minimum radial deformation decreases from 0.85 mm to 0.0325 mm (at a pressure of 500 Pa, for 24 braided wires). When the wire diameter increases from 0.026 mm to 0.052 mm, the minimum radial deformation decreases from 0.65 mm to 0.055 mm (at a pressure of 500 Pa and a braiding angle of 60 degrees, for 24 braided wires). Frictions don't affect stent diameter and its axial length when braided stent is crimping, but the friction must be considered when it is related to the radial pressure required for compression the braided stent. CONCLUSIONS: Compared with commonly used intracranial stents, a braided stent with geometrical parameters close to PED stent has a smaller radial stiffness but a considerably greater longitudinal flexibility. The results of this analysis of braided stents can help in the design and selection of flow diverter stents for clinical treatment of cerebral aneurysms.