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 comprisesa peristaltic pump mechanism,a housing for housing at least a portion of the peristaltic pump mechanism,a flexible tube unit configured to be connected at an access port end to the patient access port, and at a collection unit end to a collection unit,a cover for covering movable parts of the peristaltic pump mechanism,a regulator unit configured to regulate a rotational speed of the peristaltic pump mechanism,wherein the flexible tube unit 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 of the flexible tube unit repeatedly such that pumping occurs in a desired direction.
