Infusion arrangement for administering a medical fluid

An infusion arrangement for administering a medical fluid, comprising:

• a medical elastomer pump with an elastomer membrane which forms a pump volume for receiving and delivering the medical fluid, wherein the elastomer membrane, in a filling state of the pump volume at least partially filled with the medical fluid, has an elastic expansion dependent on the filling state, and wherein the elastic expansion subjects the pump volume to a delivery pressure that is dependent on expansion and thus variable over an infusion duration,
• a fluid conduit path which is provided for discharging the medical fluid from the pump volume and which at a first end is fluidically connected to an outlet of the pump volume and at a second end is fluidically connectable to a patient port, and
• a fluid control device which is arranged in the fluid conduit path and is designed to influence a volumetric flow of the medical fluid delivered through the fluid conduit path by the medical elastomer pump,
• wherein the fluid control device has a hydraulic flow-regulating valve, which is designed to regulate the volumetric flow to a setpoint value and is provided with a throttle action that is automatically variable at least in accordance with the delivery pressure, and
• wherein the hydraulic flow-regulating valve is a 2-way hydraulic flow-regulating valve and has a first flow resistor, on which the delivery pressure acts at an inlet side and an outlet pressure acts at an outlet side, and a second flow resistor, which has the throttle action and is located downstream from the first flow resistor in a delivery direction of the volumetric flow, and a pressure scale arrangement with a hydraulically movable actuating element which is subjected at one end to the delivery pressure and at another end to the outlet pressure and by which the second flow resistor is automatically variable in accordance with a movement of the hydraulically movable actuating element caused by differential pressure.