The invention relates to an apparatus (9) for extracting at least one blood component contained in a primary bag (1) from a bag system, said bag system further comprising at least one bag (4) of solution containing a solution additive for said blood component and at least one collection satellite pocket (3) for collecting said blood component supplemented with said additive solution, said pockets (1,3,4) being associated with each other by tubules, said apparatus comprising； an extraction device (14) for extracting the blood component by compression from the primary bag (1), a control device (15) for allowing the transfer of said extracted component or said extracted component and the additive solution, in the satellite bag (3) for collecting via the tubes, an agitating device (16) for agitating the satellite bag (3) for collection, and a control system for controlling said extraction device (14) , said control device (15) and the stirring device (16), said system being designed to allow homogeneous mixing of the extracted blood component and the additive solution.L'invention concerne un appareil (9) pour extraire au moins un composant sanguin contenu dans une poche primaire (1 ) d'un système à poches, ledit système à poches comprenant en outre au moins une poche (4) de solution contenant une solution additive pour ledit composant sanguin et au moins une poche satellite (3) de recueil destinée à recueillir ledit composant sanguin additionné de ladite solution additive, lesdites poches (1,3,4) étant associées entre elles par des tubulures, ledit appareil comprenant； un dispositif d'extraction (14) destiné à extraire le composant sanguin par compression de la poche primaire (1), un dispositif de contrôle (15) destiné à permettre le transfert dudit composant extrait ou dudit composant extrait et de la solution additive, dans la poche satellite (3) de recueil par l'intermédiaire des tubulures, un dispositif d'agitation (16) destiné à agiter la poche satellite (3) de rec
