Study on Deformational Behaivior and Strength of Catheter : Viscoelastic response under uni-axial tension, and relation between geometry of a braid and Young's modulus

Abstract

The catheter is known as a tubular medical instrument which is used to discharge the imputities of abdominal cavity or to inject nutrients into a body. However, the catheter is used not only for the purpose of the discharge or injection alone but also for the removal of the imperforation in the blood vessel without receiving a large damage by surgical operations. Therefore, a soft characteristic is necessary as the material of catheter. Simultaneously, the responsiveness and the operationality are required in order to carry out the remote operation smoothly. The purpose of this study is to investigate the deformational behavior and strength of catheter which is made from the nylon resin braided by a thin stainless wire. In this paper, we clarify a viscoelastic response by performing a stress relaxation and creep experiment. Moreover, we try to investigate the relation between the braid-angle and the Young's modulus.