An apparatus for treating a patient having a disorder related to the passageway of the patient's intestines, such as constipation or incontinence, comprises a pump for implantation in the patient operable on at least one selected portion of the intestines to pump intestinal contents through the passageway of the intestines. The pump includes a constriction device for alternately constricting the selected portion to at least substantially reduce the volume of the passageway of the intestines along the selected portion and to release the selected portion to increase the volume of the passageway of the intestines along the selected portion, such that intestinal contents is displaced through the passageway of the intestines.
