Blood collection device

An apparatus for collecting a target volume of blood in a collecting bag of a bag system further comprising a collection needle connected to the collecting bag via a flexible tube, said apparatus comprising:

• a plate intended for receiving the collecting bag,
• a clamping device of the flexible tube comprising a bearing element having a bearing surface against which said flexible tube is intended for being clamped, a clamping element having a clamping surface facing the bearing surface, the clamping element configured to move with respect to the bearing element between at least one open position where the flexible tube placed between the bearing surface and the clamping surface is not deformed and an obturation position where the flexible tube placed between the bearing surface and the clamping surface is obstructed;
• and
• a control unit, configured for determining the volume of blood collected in said collecting bag and displacing the clamping element from the open position to a first intermediate position between the open position and the obturation position, when the determined volume of blood collected in the collecting bag reaches a predetermined volume.