Study on the Sensitivity of Flow Rate Change after Head Variation in Rotary Blood Pump with Constant Voltages

The comfortability of the receptor with a heart pump becomes more and more important in the future. One of the key technologie to achieve this purpose is to improve the sensitivity of flow rate change after the head variation in the pump, so as to maintain the flow rate balance between the left ventricular assist pump and right ventricle. This paper improved motor control system in left ventricular assist impeller pump through the pressure feedback control the flow rate changes along with the head variation (2mmHg, 3mmHg, 4mmHg, 5mmHg), always to maintain the change of the flow rate (1L/min), so that the sensitivity of the flow rate changes was increased with the pumping head, improving the comfortability of the receptor.