A kind of artificial heart-lung apparatus (100) may be connected to patient (average) and enter human body using roller pump (120) for sending removal blood, and described device (100) has: the roller pump (120) Removal blood line (101) flows to roller pump (120) for conveying removal blood One first blood transmitting line (104) sends from roller pump (120) towards human body for conveying blood Blood flow velocity sensor (111) are removed to be arranged in the removal blood line (101) With control unit (140). The flow velocity of control unit (140) control blood, which is fallen in by the roller pump (120) in particular range, passes through removal blood measuring blood flow velocity sensor (111) relative to the removal of flow velocity.
