カテーテルのクリープ変形挙動に関する研究

（3段階の引張りと捩りに関するステップ比例荷重下で得られるクリープ変形挙動に及ぼす含水の影響について）

抄録

In general, as the materials for the catheter used in the surgery, a certain degree of rigidity and responsiveness is required for bringing the tip of the catheter to the target location. In the present study, using the catheters made of soft nylon resin reinforced with thin stainless wires, the creep deformation behaviors under three stage step stress for uniaxial tension or torsion load are investigated. It is presumed that the Young's modulus of matrix decreases and the braids become easy to peel off due to the water contained. Moreover, it is considered that the loading histories for tension and torsion affect the creep deformation behavior under water containing condition. Therefore, as a preliminary step to verify them, experiments are conducted under the proportional loading state with changing the ratio of tension and torsion, and the creep behaviors obtained under water containing condition are compared with non-water containing condition.