右心補助人工心臓開発における羽根車の動的特性に関する研究

―磁気駆動部の影響―

抄録

A left ventricular assist device (LVAD) is also used for right ventricular assist because a right ventricular assist device (RVAD) has not developed. LVADs should be driven at off-design point because the demanded head of a left heart is different from that of a right heart. When blood pumps are driven at off-design point, the instability of impellers can occur and lead to damages of blood. In the present study, the influence of the change of the attractive force due to the arrangement of the magnet on the movement of the impeller was evaluated in a RVAD under development was investigated. In experiments, performance tests of the RVAD were carried out and motions of the impeller were measured by two laser displacement sensors. As a result, changes in attractive force did not affect pump performance. It was also confirmed that the improved impeller operated more stably against disturbance. Therefore, it can be said that the improved impeller is more suitable for practical application.