A body drainage system for draining fluid from a body cavity of a patient, the body cavity being provided with an access port, wherein the system comprises -a peristaltic pump mechanism (2), -a housing (1) for housing at least a portion of the peristaltic pump mechanism, -a flexible tube unit (3, 6, 7) configured to be connected at an access port end to the patient access port, and at a collection unit end to a collection unit (8), -a cover for covering movable parts of the peristaltic pump mechanism (2) -a regulator unit configured to regulate a rotational speed of the peristaltic pump mechanism, wherein the flexible tube unit (3, 6, 7) is configured to form a loop suitable to be placed in one way only at peristaltic pump mechanism making it possible for the peristaltic mechanism to compress a pump portion (3) of the flexible tube unit (3, 6, 7) repeatedly such that pumping occurs in a desired direction.
