血管内カテーテル・ガイドワイヤーシミュレーターの研究

（カテーテルの挿入手法が治療に与える影響の調査)

抄録

Weakness of arterial wall leads to cerebral aneurysm. To prevent aneurysm rupture, endovascular therapy has been widely used. Guide wire and catheter used in this therapy are wire-like device. To safety operate these devices, well-experienced operators are required, because it is difficult to perfectly expect the behavior of these devices in blood vessel. Unexpected large deformation of devices in blood vessel often leads to accidents. Numerical analysis is effective tool to understand the nonlinear behavior of these devices. In this study, the character of two methods to navigate a catheter through a guide wire was investigated. A guide wire and catheter were modeled using short rigid bar (or pipe) and coil spring. The configurations of two catheter models (S-type and Double angle-type catheter model) were determined based on the catheters which were widely used. From numerical analysis, the hypothesis that the particular navigation method was superior to the other were rejected. The each combination of navigation method, guide wire and catheter had different character. The strain energy of S-type catheter model in navigation process was about twice larger than that of double angle-type catheter model. This suggested that when S-type catheter is selected for therapy, possibility of large deformation in navigation process is higher.