An apparatus for introducing at least one compound into the erythrocytes； the apparatus (1) comprises a system (2) of connection channels, which includes a first and a second channel (9, 10)； an introduction unit (3) for inserting a sample containing the erythrocytes into the apparatus (1)； a separation unit (4) to separate the different components of the sample from each other； a combination unit (5), which comprises a first reservoir (6) and in the area from which the erythrocytes and the compound combine with each other to obtain treated erythrocytes； an inlet (7) to insert the compound into the first reservoir (6)； a feeding unit (8), to introduce a first solution through the first channel (9) and introduce a second solution through the second channel (10)； a concentration unit (11) to concentrate the contents of the first tank (6)； and a collection unit (12), comprising a second reservoir (13) for collecting the treated erythrocytes； the channel system (2) connects the input unit (3), the separation unit (4), the combination unit (5), the power unit (8), the concentration unit (11) and the unit collection (12)； the apparatus (1) is characterized in that it comprises a control unit (15)； and first pumping means (49), which are operable by the control unit (15) and which are designed to move fluids at least between the introduction unit (3), the separation unit (4), the combination unit (5) and the collection unit (12)； The supply unit (8) comprises first adjustment means (29), which are operable by the control unit (15) and which are arranged along the first channel (9) to regulate the flow along the first channel (9)； and second adjustment means (30), which are operable by the control unit (15) and which are arranged along the second channel (10) to regulate the flow along the second channel (10)； The collection unit (12) comprises third adjustment means (33), which are operable by the control unit (15) and which are adapted to adjust the flow in the direction
