抄録
In order to reduce hemolysis in a centrifugal pump, wall shear stress on a pump casing was measured using a flush-mounted hotfilm probe. The blood pump was Nikkiso HPM-15. The measured shear stress reached the maximum value at the location of r/R≅0.8 between impellers, and was approximately proportional to the pump rotational speed. At the speed of 3000rpm, shear stress exceeds 300Pa over the region of r/R>0.5. At the high rotational speed, when the red blood cells enter into the thin high shear layer on the casing surface, the sells suffer instant damage, which would be one of the key factors for hemolysis.
