Abstract
The ventricular assist device (VAD) should supply the wide range of the flow assistance according to the cardiac requirement after the failing natuaral heart. The flow behavior within our different several types of VADs had been analized with the numerical method based on the flow visualization technique. In this study, it was observed that the stagnation in which the thrombus would be generated was affected mainly by the contour of VAD. According to the results of the flow. characteristics within VADs, the contour of the junctions between the sac and the inflow and outflow tracts were improved to the smooth configuration which enhanced the rotating flow in the diastole and minimized the stagnant area within the sac. It was concluded that the flow visualization furnished the very useful information on the development of the VAD.
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