Patent ID: 6817836
Filing Date: 2004-11-16
Classification: A61M,F04B,F04D,Y10S

Abstract:
A method for controlling a continuous flow rotary blood pump, comprising:establishing a normal operating range of the blood pump, said normal operating range comprising a normal pump flow range and a normal pressure head range; setting a target rotational speed of said pump in accordance with said normal operating range; determining a current operating condition of the blood pump, said current operating condition comprising a current pump flow, a current pressure head, and a current rotational speed of said pump; comparing the current operating condition with the normal operating range; selecting an appropriate control algorithm from a plurality of available control algorithms based on said comparison; and adjusting the target rotational speed of said pump using said selected control algorithm to maintain or recover said normal operating range, wherein: establishing said normal operating range comprises establishing a target operating point for the target rotational speed of the pump which provides a target pump flow and a target pressure head; said normal pump flow range is within a 20% deviation from said target pump flow; and said normal pressure head range is within a 25% deviation from said target pressure head.