A cardiac pump is arranged to mimic triphasic operation. The pump uses a fluid line formed from flexible tubing, along with a reciprocating actuator arranged to move between a free orientation and an occluding orientation. This allows a portion of the fluid line to be selectively occluded during movement of the actuator, enabling blood or other fluids to be peristaltically forced fluid towards a fluid outlet. The direction of operation of the actuator, and the selection of appropriate occluding or free orientations, allows the pump to be operated in a triphasic manner.
