Patent ID: 8758603

Claim:
A plasma purifying device, comprising: a plasma separator for which a collected blood circuit is connected to a blood inlet, a return blood circuit is connected to a blood outlet, a first pressure measurement circuit is connected to a first filtration outlet and a plasma circuit is connected to a second filtration outlet; a plasma component separator or plasma adsorber for which the plasma circuit is connected to a plasma inlet, and a return plasma circuit leading to the return blood circuit is connected to a plasma outlet, a blood pump which is installed in the collected blood circuit, and which supplies blood to a blood side space of the plasma separator; a plasma pump which is installed in the plasma circuit, and which supplies plasma to the plasma component separator or the plasma adsorber; an air pump which is installed in the first pressure measurement circuit, and which supplies air to a filtration side space of the plasma separator; and a control unit for controlling flow rates of the air pump and the plasma pump so that a pressure of the filtration side space of the plasma separator is higher than a pressure of the blood side space while delivering blood to the blood side space of the plasma separator by continuing to operate the blood pump without stopping following completion of plasma purification, and then delivering plasma remaining in the filtration side space of the plasma separator to the blood side space of the plasma separator or to the plasma circuit by supplying air from the air pump.