Abstract
Generally, as for the material of catheter, soft characteristic is necessary not so as to damage vascular wall etc. On the other hand, a responsibility and enough rigidity are also required for the surgical operations such as myocardial or cerebral infarction. The purpose of this study is to investigate physical property of the catheter, which made of soft nylon resin and is reinforced stainless braid. In a previous report, combined tension and torsion tests have been carried out to investigate visco-elastic response under multi-axial loading, and we have been discussed the effect of braid's angle. In this paper, we investigate the stress relaxation under two-stage step strain with respect to tension and torsion. In addition, we try to formulate the numerical model for visco-elastic response based on these experimental results.
