Blood-separation device with displacement body

A blood separation device for separating blood into a plurality of blood components by a centrifugal force generated during a centrifuging process in a centrifuge, the blood separation device comprising:

• a first chamber for receiving a blood bag filled with the blood, the blood separating into the plurality of blood components by the centrifugal force in such a way that each of the plurality of blood components is located—as seen in a direction of the centrifugal force—in a separate section of the blood bag according to its specific weight after completion of a first phase of the centrifuging process,
• a second chamber for receiving at least one component bag that is provided for filling with one of the plurality of blood components,
• the at least one component bag comprising an inlet opening that is connected to an outlet opening of the blood bag via a line in which a controllable valve is arranged,
• a displacement body being arranged in the first chamber and exerting a pressing force onto the blood bag which is directed substantially perpendicular to the direction of the centrifugal force, wherein the displacement body is shaped in order to generate the pressing force by the centrifugal force and/or by a spring force, and
• a control unit, which during a second phase of the centrifuging process opens the controllable valve until said one of the plurality of blood components has passed into the at least one component bag as a result of the pressing force of the displacement body.