Abstract: A blockage prevention device is provided for ileal conduit urine collection systems of the type having a flexible bag which is coupled to the ileal conduit stoma of a patient to receive urine therefrom. The bag has an outlet located in the neck portion thereof for draining the collected urine to a storage receptacle. The prevention device comprises an elongated member having a fluid-conducting passageway extending therethrough and a plurality of helically-disposed apertures extending through the walls of the member. The member is disposed in the interior of the bag and serves to connect that portion of the interior of the bag lying outside of the neck portion with the bag outlet, so that urine collected in the bag because of a blockage in the neck portion will drain through the member to the bag outlet. The end of the member which is disposed in the bag outlet is provided with a fitting having a collar portion which abuts the bag outlet to limit insertion of the member into the bag.