Simulation of Mechanical Behaviors of NIR Stent in a Stenotic Arter

The implantation of intravascular stent (IVS) is a kind of coronary angioplasty to restore the blood flow perfusion to the downstream of the heart muscle tissue. Since stenting does not require any surgical operation and has less complication, pain and a more rapid recovery compared to the other possible treatments, the use of coronary stents in interventional procedures has rapidly increased in recent years. In order to have the better output of stent implantation, it is necessary to analyze the mechanical behavior of this device before manufacturing and utilizing. One of the most effective methods to investigate the mechanical behavior of the stent is finite element method. As the main objective, this study aims to investigate the expansion characteristics of a stent as it is deployed in an artery containing a plaque and propose a model as close to real conditions of stent implantation as possible. A nonlinear model that contains balloon, stent and vessel with plaque is used and bi-linear elasto-plastic material model for stent and hyperelastic material models for balloon, artery and plaque have been assumed. This model includes the internal pressure of blood. Stress distribution, radial gain, outer diameter changes, dogboning and foreshortening are investigated.