抄録
Cascade pump has a rotating disk with circumferential vanes. Flow channel is constructed around the circumferential space of the rotating disk. The cascade pump has thin structure because the inlet and outlet ports are set on the same plane with the rotating disk. The gap between disk surface and casing should be less than 0.05 mm to prevent pressure loss through the gap in the cascade pump. The gap of the cascade pump produces higher hemolysis and thrombus in it. The disk surface gap is minimized with modifying the impeller to ring shape with a radial self-bearing motor to achieve better blood compatibility. Developed pump has maximum diameter of 59 mm and a thickness of 22 mm. Maximum flow rate and head pressure are 7 L/min and 330 mmHg, respectively. The hemolysis property is just two times of the commercial based blood pump and sufficient for mechanical circulatory support.
