Mechanical Analysis Of Vascular Stents Based On Fluid-Structure Coupling

In recent years,vascular stent implantation has gradually developed into the main method of treatment of cardiovascular disease.How to evaluate some basic mechanical properties during stent implantation,the effect of stent implantation on plaque and vessel wall,the supportive force on vessel wall after implantation,and the fluid-structure interaction analysis under blood flow are very important subjects.In this paper,three kinds of simulation methods such as single scaffold,scaffold plus simulated blood vessel load,scaffold plus blood vessel wall were compared,and the basic mechanical properties of scaffolds and the evaluation of supporting force of blood vessel wall were obtained by using the finite element software ABAQUS simulation analysis.The ABAQUS Coupling Analysis performs bi-directional fluid-solid coupling analysis of the stent,vessel wall,and blood.The main contents include:1.Through the simulation of the four implantation stages of the stent,such as grasping,grasping rebound,expansion and expansion and rebound,it is found that the extreme stress point of the stent is always located on the inner surface of the curved section of the stent,and the maximum value of stent stress Appeared in the expansion stage,indicating that the stent surface of the curved section of the dangerous point,the expansion phase is a dangerous process;2.The comparative analysis of the three models shows that the supporting force of the magnesium alloy stent on the blood vessel wall is about 0.1Mpa.By comparing the basic mechanical properties of the 316 L stainless steel and magnesium alloy stent,it can be seen that in the 316 L stainless steel stent,Superiority3.The influence of blood flow on the stent and the influence of the stent implantation on the blood flow state were obtained through the fluid-structure coupling analysis of the coupling model of the stent,the blood vessel wall and the blood.