Interface device between an external equipment and lines intended to be connected to a patient system

An interface device between external equipment and at least a venous tube for connecting to a patient system in order to transfer fluid from the equipment to the patient system, the interface device comprising at least:

• a first port adapted to be connected to an outlet port of the external equipment;
• and
• a venous port for injecting the fluid into the venous tube;
• the interface device being adapted to adopt selectively a first configuration in which fluid is prevented from passing between the first port and the venous port and a second configuration in which the first port is connected to the venous port to allow fluid to pass from the first port to the venous port, the interface device being characterized in that:
• it includes a third port and is adapted to adopt selectively a venous lock access configuration that is different from said first and second configurations the third port being connected in this venous lock access configuration to the venous port while the first port is isolated from the venous port;
• and in that
• the venous port is carried by a stator of the interface device, the first port and the third port being carried by a movable assembly of the interface device that is movable relative to the stator, the interface device being arranged to pass from any one of its configurations to another one of its configurations by the movable assembly moving relative to the stator.