Medical pump device for conveying a medical fluid

A medical pump device for conveying a medical fluid, the medical pump device comprising:

• an elastomeric membrane, which forms a pump volume for receiving and delivering the medical fluid,
• wherein the elastomeric membrane is elastically expanded in a filling state of the pump volume at least partially filled with the medical fluid,
• and wherein, the elastically expanded elastomeric membrane exerts a delivery pressure on the pump volume in order to deliver the medical fluid into a medical fluid-line system connectable in a fluid-conducting manner to the pump volume,
• the medical pump device further comprising a throttle device with a channel,
• wherein the channel has an inlet, which is connected in a fluid-conducting manner to the pump volume, and an outlet, which is connectable in a fluid-conducting manner to the medical fluid-line system,
• and wherein the channel is designed in such a way that a delivery of the medical fluid through the outlet is adjustable to a defined flow rate,
• wherein the throttle device has at least a first body and a second body, wherein the channel is formed between oppositely arranged surfaces of the first body and the second body, and wherein the surfaces are movable relative to each other for finely adjusting the defined flow rate in such a way that an effective length of the channel is variable, and
• wherein the first body has a cylinder bore, and the second body comprises a cylinder, wherein the cylinder is fitted into the cylinder bore, and wherein the channel comprises an at least single-flight helix in a radial direction between the cylinder bore and the cylinder.