Micropump

A patch pump device comprising a disposable unit and a reusable base unit (38) removably mounted to the disposable unit, the disposable unit including a drug reservoir (41) and a catheter (5) adapted for subcutaneous drug administration, the disposable unit having an adhesive base (43) adapted for adhesive mounting of the patch pump on a patient's skin, the device further including a pump comprising a pump module (2) and a drive (36), wherein the pump module is mounted to the reservoir in the disposable unit, said catheter being connected to an outlet (28) of the pump module, and the drive is mounted in the reusable unit and is configured to drive a rotor (6) of the pump module. The pump module includes a stator (8), a rotor comprising an axial extension (14,16) slidably and rotatably mounted at least partially in a rotor chamber (10) of the stator, and at least first and second valves between an inlet and the rotor chamber, respectively between the rotor chamber and an outlet (12), that open and close as a function of at least the angular displacement of the rotor.