A balloon colostomy obturator made of rubber is designed. It consists of a mushroom-like disc covering the artificial anus and a hollow tube-like obturator for inserting into the anal canal. The latter is kept unextruded in position with an inflatable balloon incorported around the tubeobturator. The balloon obturator does not collect but allow evacuation of solid stools at intervals and passage of gas at all times

through a filtering device in the hollow lumen of the tube-obturator. Intermittent evacuation of solid stool is controlled by an electronic transmitter installed inside the tube-obturator

which would alarm the patient to remove the obturator as a whole for evacuation of stool when enough of it accumulate and exert enough pressure on the transmitter to start the alarm. The device proves to work in animal experiment and clinical application in colostomy patients