Abstract
A magnetically suspended centrifugal blood pump has no mechanical friction, so its shaft torque is stable and almost linear to its motor current. Using this characteristic, the pump head and flow rate can be evaluated from motor current and rotating speed. However, pump characteristics depend on blood viscosity. Therefore, it is important that the change of blood viscosity can be calibrated. Reynolds number is defined using Casson's viscosity and rotating speed of the motor. Then the relationships of pump head versus flow rate and motor current versus flow rate indicate a slightly different Reynolds number dependence between blood and glycerol aqueous solutions. The indirect measurement of the pump head and flow rate from observed motor current and rotating speed was confirmed to have good accuracy and response.
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