506 動圧浮上遠心血液ポンプのスラスト軸受形状がインペラ浮上特性に与える影響(OS9 オーガナイズドセッション《ライフサポートによる光学技術》)

Abstract

We have developed a hydrodynamically levitated centrifugal blood pump as a bridge to decision pump. However, since the bearing stiffness of the hydrodynamic bearing is small, the bearing gap tends to become narrow. The purpose of this study is to evaluate the improvement of the impeller levitation performance due to the effect of the thrust bearing geometry with spiral groove on impeller levitation performance in a hydrodynamically levitated centrifugal blood pump. We compared the geometric models that have different groove width. The numerical analysis was performed in order to calculate the bearing stiffness. The impeller levitation performance test was conducted using a mock circulation loop and a laser focus displacement meter. As a result, it was found that the sudden contraction model achieved an improvement of the impeller levitation performance in a hydrodynamically levitated centrifugal blood pump.