A hydro dynamic centrifugal blood pump was developed using a Conical Spiral Groove Bearing (CSGB) is developed, whose geometry was determined based on a preliminary test. As the result of the preliminary test for the optimum groove shape, groove depth and number ware set to be 210μm, and 10, respectively. The performance test of the pump with CSGB showed the pump head H=2.5m (180mmHg) and flow rate Q=3.5L/min at rotational speed 3000 min^<-1>.
