A percutaneous gastrostomy catheter includes an internal retainer configured to be maintained pressed against the stomach wall and to disengage itself from a tubing by biodegradation; and an external flange, traversed by the tubing, configured to be pressed against an external face of the abdominal wall and exert, in cooperation with the internal retainer, a pressure adapted to press an external face of the stomach wall against an internal face of the abdominal wall. The internal retainer includes an internal flange. A first face of the internal flange is configured to be pressed against an internal face of the stomach wall, the internal flange being detachable from the tubing under the effect of a simple pulling force. The internal retainer also includes an end piece pressed against the second face of the internal flange, such that the internal flange is between the end piece and the external flange, the end piece being made of a completely biodegradable copolymer or polymer having a bond with the tubing.