PURPOSE: To eliminate extra liquid from blood and treat the blood by disposing a valve between an intermediate storing vessel and a storing vessel for finally treated blood, and opening the valve when a value of blood being suitable to return to a patient. CONSTITUTION: A suction device 1 sucks a blood and when the valve of the blood becomes suitable for returning the blood wash from a surgical site, and the mixture of an anticoagulation and a diluent is supplied to the suction device 1 from the mixture-stored vessel 12. This mixture is further mixed with a sucked blood in the suction device 1, and then introduced into a reservoir 3 for incising the heart. The whole mixture is sucked into a circulation circuit 17 by a pump 4. A circuit 17 includes a filter 5 and an intermediate storing vessel 7, thus an extra liquid is discharged to a collective vessel 6 by the action of the filter 5. The supply of the mixture horn the storing vessel 2 is adjusted by the adjusting lever 11 of an inlet valve in the suction device 1. In order to be movable a valve-cone 13a between a fully closed position and one opening position by the adjusting lever 11, and according to any requirement, the mixture of the anticoagulation and a diluent is supplied into a conduit 15 through a conduit 14, thus the mixture can be mixed with the sucked blood by the suction device 1.
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