414 遠心血液ポンプの動圧軸受形状がインペララジアル安定性と溶血に及ぼす影響(OS5-(4)オーガナイズドセッション《ライフサポートにおける工学技術》)

概要

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We have been developing a centrifugal blood pump with hydrodynamic bearings. The purpose of this study is to clarify experimentally the effect of the configuration of a hydrodynamic journal bearing to impeller radial stability and hemolysis for centrifugal blood pumps with hydrodynamic bearings for two weeks circulatory assist in order to establish a hydrodynamic journal bearing design method. We compared two depths of herring-bone groove on the journal bearing as 50 μm and 0 μm (no groove). Impeller trajectory was measured using two laser displacement sensors. Next, an in vitro hemolysis test for 4 hours was conducted with bovine blood added with heparin at a flow rate of 4 L/min and a pressure head of 200 mmHg. The experiments showed that the groove on the journal bearing will be useful for hemolysis reduction resulted by the impeller radial stability in a centrifugal blood pump.
2011-08-26