A device for separating condensed water from an operating gas of a pneumatic pulsatile system is provided. The device has a gas line section with a gas inlet and a first and a second gas outlet. The device further comprises a condensation container for extracting the condensed water out of the operating gas, said condensation container being connected to the second gas outlet. A transition region from the second gas outlet to the condensation container has a cross-sectional enlargement, and the condensation container has means for discharging the extracted condensed water. A pneumatic pulsatile system and a cardiac support system are also provided.