Lead development of next generation axial flow blood pump

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First, we investigated that the performance of axial flow pump can be improved by forced whirling motion (FWM). Although it is clear that FWM with the rotational ratio of 1 is the most effective for the pump performance improvement, its reason is not clarified yet. The internal flow of the pump was calculated with and without FWM for unsteady conditions to clarify the effects of FWM on pump performances. The CFD results revealed the differences in flow patterns between with and without FWM, and the estimation of distribution of shear speed around the impeller and on surface of it. The CFD results show that local downstream flows near the impeller are changed by the movement of the impeller with FWM. It was clarified that the pump flows and its behaviors contributed to the improvement in the performances of an axial flow pump using the FWM effect.