Ventricular assist blood pump

摘要

A ventricular assist blood pump of the present invention includes: a rotational part having an impeller; and a housing which houses the rotational part therein. In the ventricular assist blood pump, a difference between a maximum flow rate and a minimum flow rate of a liquid in a state where the ventricular assist blood pump is connected to a liquid-discharge source which discharges the liquid while increasing and decreasing the flow rate of the liquid at a fixed cycle is 40% or more of a difference between the maximum flow rate and the minimum flow rate of the liquid in a state where the ventricular assist blood pump is not connected to the liquid-discharge source. A ventricular assist blood pump of the present invention can suppress the degree at which the health of a user deteriorates during long-term use compared to a conventional ventricular assist blood pump.

主权项

1. A ventricular assist blood pump comprising:
a rotational part having an impeller and a housing which houses the rotational part therein, wherein a first numerical value obtained by dividing a volume of the rotational part by a capacity of the housing falls within a range of 0.01 to 0.50, and a relationship between a head of the ventricular assist blood pump and a flow rate of the ventricular assist blood pump is measured using a liquid whose viscosity and density correspond to viscosity and density of blood as a working liquid, and in a graph where the head of the ventricular assist blood pump is taken on an axis of ordinates using mmHg as a unit and the flow rate of the ventricular assist blood pump is taken on an axis of abscissas using L/min as a unit, the flow rate of the ventricular assist blood pump is set to 5 L/min or more at a point where the head of the ventricular assist blood pump is lower than a shutoff head of the ventricular assist blood pump by 20 mmHg in pressure at a fixed rotational speed of the rotational part.