Pump rotor

A peristaltic hose pump for pumping of a medical fluid, comprising:

• a pump bed having an arcuate form;
• and
• a pump rotor at least partially surrounded by the arcuate form of the pump bed,
• wherein a disposable pump hose is insertable into the pump bed to be located between the pump rotor and the pump bed,
• wherein the pump rotor comprises:
• at least two rotor rollers configured to urge the pump hose against the pump bed, wherein the pump hose is occluded in a region of the at least two rotor rollers, and wherein the medical fluid is pumped through the pump hose by rotation of the pump rotor, and
• at least one actuating device for extending and retracting the at least two rotor rollers hydraulically, pneumatically, or both, wherein the at least one actuating device is a double-acting actuating device, wherein the double-acting actuating device is at least one of a (i) double-acting hydraulic cylinder, (ii) double-acting pneumatic cylinder, (iii) double-acting hydraulic piston, or (iv) double-acting pneumatic piston, to which at least one of a hydraulically generated pressure and a pneumatically generated pressure can be applied on both sides of the cylinder or piston.