S021024 Numerical Analysis of Guidewire and Catheter in Blood Vessels : Dynamic Motion of Guidewire

Abstract

In this study, we evaluated the dynamic motion of guidewire and catheter in blood vessels by numerical analysis. The model of the guidewire is constructed with viscoelastic springs and segments. The proximal part of the guidewire model is constrained by the catheter model, which is fixed and assumed to be a rigid tube. First, after displaced and released the guidewire, the damped free vibration was analyzed. Second, the motion of the guidewire in torus-shaped blood vessel model was calculated when the proximal part of the guidewire model was pushed and pulled. The vessel is an elastic circular cylinder, whose shape is defined by the centerline and the radii. Collisions between the guidewire and the vessel are calculated and the contact forces are determined according to the stiffness, damping and friction of the vessel wall. The viscous term for each joint of the guidewire model used in our previous studies was smaller than actual values. The viscous term affected the trajectory of the guidewire tip and the contact force.