Analysis and Optimization for Support Performance of Magnesium Alloy Stent
10.16156/j.1004-7220.2019.01.03
- VernacularTitle:镁合金冠脉支架支撑性能分析及其优化
- Author:
Honghui ZHANG
1
;
Haiquan FENG
2
;
Zhiguo LI
2
;
Qingsong HAN
2
Author Information
1. College of Mechanical Engineering, Inner Mongolia University for Nationalities
2. College of Mechanical Engineering, Inner Mongolia University of Technology
- Publication Type:Journal Article
- Keywords:
magnesium alloy stent;
support performance;
finite element analysis;
penalty function;
structure optimization
- From:
Journal of Medical Biomechanics
2019;34(1):E014-E020
- CountryChina
- Language:Chinese
-
Abstract:
Objective To conduct simulation analysis on support performance of the stent by using finite element method, and optimize structure parameters of the stent by using Kriging surrogate model, so as to provide more scientific guidance for clinical treatment with design and development of the stent. Methods The contact model was established by penalty function method. The generalized variational principle was selected as theoretical basis of the numerical simulation, and the theory of Kriging surrogate model was used for finite element optimization on support stiffness of the stent, so as to study the effect from the number of circumferential support, the length of the support and the initial diameter on support performance of the stent. Results With the increase of the number of circumferential support or the length of the support, the support performance showed the decreasing tendency; with the increase of the initial diameter, the support performance showed the increasing tendency. From seven stents by using the theory of Kriging surrogate model, it was concluded that structural parameters of the optimal stent were: the number of circumferential support was six, the length of the support was 1.15 mm, and the initial diameter was 1.65 mm. Conclusions The numerical result agreed well with the experimental data and the error was smaller than 5%, and the error rate of experimental repeatability was within 0.5%, which verified effectiveness and rationality of the finite element analysis. The optimization of support performance provides an important reference for design and exploration of new magnesium alloy stent.
