Development of a wearable, pediatric centrifugal circulatory support system

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In this study, we focused upon basic research leading to development of a pediatric circulatory support system. To meet this goal, we have designed a small centrifugal blood pump with a 30mm diameter impeller having 6 straight vanes, supported by a hydrodynamic bearing at its center and driven through outer-radial magnetic coupling to the external motor. The pump diameter measured to be 60mm and its height including the motor to be 30mm, yielding the displaced volume of 85ml and the priming volume of 5ml. The pump provided the flow of 1.0 – 1.5 L/min against the afterload of 100mmHg at the pump speed of 2500 rpm. The pump can be implanted in either extra-corporeally or intra-corporeally inside the thorax from the left ventricular apex to the descending aorta. Because of its small size and extremely small priming volume, it can be used for circulatory support from fetuses, neonates to children bridging to heart transplantation and other more advance therapies.