Deformation Analysis of Self-Expanding Stent Considering Plaque and a New Expanding Mechanism

Katsuhiko Sasaki; Yukiko Tomooka; Ryo Takeda; Achmad Syaifudin

Katsuhiko Sasaki Department of Mechanical Engineering, Faculty of Engineering, Hokkaido University
Yukiko Tomooka Department of Mechanical Engineering, Faculty of Engineering, Hokkaido University
Ryo Takeda Department of Mechanical Engineering, Faculty of Engineering, Hokkaido University
Achmad Syaifudin Department of Mechanical Engineering, Institut Teknologi Sepuluh Nopember

Keywords: FEM; nonlinear deformation; plague; SMA; stent

Abstract

In this research, effects of material properties of stent materials, such as nitinol and ferrous alloy, on a self-expanding stent are studied by the stent deployment simulations using finite element method (FEM). Stent, vessel, and plaque are modeled by using AutoCAD. The model is imported to a finite element analysis software Ansys 15.0 and the deployment analysis of the stent is carried out. In addition, two methods of the unsheathing of the self-expanding stent are studied: (1) a conventional method where a stent comes out from one end of the sheath and (2) a new method in which a stent comes out from the center of the sheath. Also, both the area stenosis ratio and Dog-Boning are discussed referring the simulations conducted in the paper.