Kit for forming implants in wall of gastrointestinal tract

A kit for treating a gastrointestinal tract of a mammal and including a package and a tubular needle, an end piece and a container of an implant-forming material carried within the package. The end piece has an outer surface provided with at least one recess and an internal passageway communicating with the recess. The end piece is mounted on the distal extremity of an elongate probe member and introduced into the upper portion of the gastrointestinal tract. A portion of the wall of the gastrointestinal tract is drawn into the recess and the tubular needle is extended through the elongate probe member and the internal passageway into the portion of the wall in the recess. Material from the container is loaded into the tubular needle and injected into the portion of the wall to form an implant in the wall.