Design and Analysis of Experimental Device for Fatigue Test of the Lower Limb Vascular Stent *

Vascular stenting is a minimally invasive procedure to treat vascular occlusion and the physicochemical properties of the stent, like fatigue, determine its service life, which is important to patients’ health. However, the current stent fatigue testing equipment cannot simulate the actual deformation of the stent in human body. Therefore, the development of a better stent fatigue testing device is of great significance. In order to simulate the physical environments of the stent due to the movements of lower extremity, the gait analysis is performed and an experimental device for fatigue testing is designed using spherical linkage mechanism and planar linkage mechanism. In this paper, the femur in the lower extremity is fixed as a frame, and the gait data of normal walking state is transformed to obtain the movement data of pelvis and tibia relative to femur. In addition, the motion of the spherical linkage and the fitting method of its space trajectory are analyzed in detail.