The Effects of a Constituent Material Optimizated Self-expanding Stent on Stenosis

Abstract

Stenting is a treatment for vascular stenosis in which a metal stent is inserted into the vessel to improve blood flow by expanding and supporting it from the inside. Currently, the materials used for self-expanding stents and their effects on improving the stenosis rate has not been fully investigated. In this study, we used finite element analysis to simulate the stenting procedure. Plaques with different material properties were modeled in a vascular stenosis model, and the equivalent stress and stenosis rate in the vessel when the stent was expanded were derived. Furthermore, sequential approximate optimization was implemented to derive material properties of the shape memory alloy which was more suitable for stenting than the conventional Ni-Ti alloy.