Abstract

Info

Title:: Evaluation?f?ulmonary?alve?tents?or?he?reatment?f?etralogy?f?allot?ased?n?inite element method

Author(s):: JIA Yunchao1; ZENG Ganhe1; CHEN Si1; JING Teng1; HE Zhaoming1; 2; 1. Department of Biomedical Engineering, Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang 212013, China 2. Department of Mechanical Engineering, Texas Tech University, Lubbock 79409, USA

Keywords:: Keywords: tetralogy of Fallot pulmonary valve stent balloon dilation plastic deformation finite element analysis

Abstract:: Abstract: Objective To analyzethe mechanical behaviors of pulmonary valve stents for the treatment of tetralogy of Fallot after balloon dilatation and unloading, thereby evaluating the therapeutic feasibility. Methods Two kinds of pulmonary valve stents with different mesh connection configurations ("X"-shape and "H"-shape) were designed, and the loading process of balloon dilatation and the elastic recoil after removing the balloon were simulated by finite element method. The von Mises stress, equivalent plastic strain and expansion were evaluated, and the effects caused by stent grid connection modes were analyzed.?esults The maximum stress and plastic strain appeared at the stent grid junction, but did not exceed the strength limit. Compared with "X" stent, "H" stent showed a lower stress and strain after loading and maintained a more stable shape after unloading. Conclusion (1) The stresses and plastic strains of stent after twice expansions are within the acceptable range, and can maintain the new shape after deformation, which verifies the feasibility of the treatment concept.(2) The maximum stress and plastic strain depend on the connection mode of stent grid. (3) Improving the connection of stent grid can effectively reduce the stress and strain, improve the stability and reduce the change to cone-shape.