Where an implanted reservoir for intestinal contents is formed from surgically modified intestine that has been cut along a mutual contact line of laterally adjacent sections of a bent portion of intestine and connected so that the resulting upper and lower halves of the intestine form an intestinal wall of the reservoir, the system for emptying such intestinal reservoir comprises an artificial flow control device implantable in the patient's body and adapted to control flow of the intestinal contents from said reservoir, the flow control device comprising at least one pump adapted to act on said intestinal wall so as to reduce the reservoir's volume, thereby emptying the reservoir. The system may further comprise an entry valve upstream of the reservoir and an exit valve downstream from the reservoir. The pump may be an electrical stimulation type pump, a hydraulically acting type pump or/and a mechanically acting type pump.