Monocanaliculonasal and/or monocanalicular intubation assembly mainly intended for nasolachrymal imperforation, comprising a mandrel (2) made of a first substantially rigid material, such as a metal, and a tube (1) made of a second material that is less rigid than the first material and essentially flexible, such as silicone, a blocking plug (6) for locking the tube in position in the lachrymal duct and protruding laterally from the tube, characterized in that the length of the tube (1) is smaller than the length of the mandrel (2) and the mandrel (2) has a greater thickness, measured in a direction perpendicular to the longitudinal direction, relative to that of the tube (1), such that said mandrel can be inserted inside the tube and withdrawn therefrom.