It consists of a hollow and cylindrical body, open on both ends, and an axially movable plunger. On the open front end, a detachable and disposable cannula is coupled under pressure, with an end hole for the passage of mucus by the backward movement of the plunger. Inside said cannula there is a foam block, while on the back of an inner diametric partition of the body of the syringe, a watertight joint is mounted, located in a neck or cylindrical section belonging to the plunger itself, whose section is established between the end head thereof, with a rhombic configuration with sharp rounded vertexes, and a trunk-conical section as the front of the plunger itself, being this trunk-conical section provided with slots for the exit and evaporation of the air when the plunger moves forward. The cannula has a trunk-conical front section and an appropriate configuration for its adaptation to the inside of the nostril, having nerves inside that work as stops of maximum movement also having, an annular projection that works as a stop, externally. The joint has a lower lip for watertightness and adjustment and is movable forward and backwards, dragged by the plunger. The back end of the body of the syringe has an inner ring as a stop limiting the maximum removal of the plunger during its backward movement.
