A system for treating a patient having a disorder related to a patient's intestine, the patient having a reservoir for receiving and temporarily collecting therein intestinal contents, the reservoir being 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, said system comprising 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, wherein the at least one pump comprises a pump adapted to act on said intestinal wall from the outside of the reservoir so as to empty the reservoir by squeezing the reservoir from the outside thereof, characterized in that the at least one pump further comprises at least one of: - an electrically driven hydraulic pump, a hydraulically acting member for acting on said intestinal wall from the outside of the reservoir, and an artificial reservoir, wherein the electrically driven hydraulic pump is adapted to pump hydraulic fluid from the artificial reservoir to the hydraulically acting member, and - at least one mechanically acting member for acting on said intestinal wall from the outside of the reservoir and an electrical motor adapted to drive the mechanically acting member for emptying the reservoir. said system comprising 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, wherein the at least one pump comprises a pump adapted to act on said intestinal wall from the outside of the reservoir so as to empty the reservoir by squeezing the reservoir from the outside thereof, characterized in that the at least one pump further comprises at least one of: - an electrically driven hydraulic pump, a hydraulically acting member for acting on said intestinal wall from the outside of the reservoir, and an artificial reservoir, wherein the electrically driven hydraulic pump is adapted to pump hydraulic fluid from the artificial reservoir to the hydraulically acting member, and - at least one mechanically acting member for acting on said intestinal wall from the outside of the reservoir and an electrical motor adapted to drive the mechanically acting member for emptying the reservoir. - an electrically driven hydraulic pump, a hydraulically acting member for acting on said intestinal wall from the outside of the reservoir, and an artificial reservoir, wherein the electrically driven hydraulic pump is adapted to pump hydraulic fluid from the artificial reservoir to the hydraulically acting member, and - at least one mechanically acting member for acting on said intestinal wall from the outside of the reservoir and an electrical motor adapted to drive the mechanically acting member for emptying the reservoir.