OPTIMIZATION OF A CENTRIFUGAL BLOOD PUMP FOR IMPLANTED USE

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The purpose of this study was to optimize the design of the components of the ultracompact centrifugal blood pump which is implanted into the patient as the ventricular assist device. The pump was drastically miniaturized to the half of the former prototype by employing direct drive DC brushless motor.The impeller design was improved considering the hydrodynamic performances, electric efficiency, washing out condition on the blood-contacting surfaces, and blood cell damage impaired by the pump. The pump performance in vitro satisfied the need for left ventricular assist device. The curved configuration of the inlet duct was also evaluated for better anatomical fitting. The collective performance as a left ventricular assist device was evaluated using an adult goat in chronic animal experiments. 65 days of survival was realized using the pump installed outside the body.The signals of the driving motor was successfully utilized to estimate the flow rate of the pump with sufficient response. This method can possibly eliminate the use offlowmeter, and also be used to detect the adverse conditions, such as the sucking by excessive pump operation.