The invention comprises a hollow cylindrical body that is open at both ends and an axially movable plunger. A removable, disposable cannula, with an end hole for the passage of mucus, on account of rearward movement of the plunger, is pressure‑coupled to the open front end. Inside said cannula is a block of foam, whilst, after a diametral partition inside the syringe body, there is a leaktight seal located in a cylindrical portion or neck belonging to the actual plunger, which portion lies between the end head of the plunger, with a rhombic configuration with strongly rounded vertices, and a frustoconical portion as front part of the actual plunger, this frustoconical portion being provided with grooves for the passage and evaporation of the air during forward movement of the plunger. The cannula has a frustoconical front portion and a suitable configuration for fitting inside the nostril, having, internally, ribs that act as maximum travel stops, and externally there is an annular stop projection. The seal has a lower leaktight adjustment lip and can be moved forward and rearward by being entrained by the plunger. The rear end of the syringe body has an internal ring as stop for limiting maximum extraction of the plunger in the rearward movement thereof.Consiste en un cuerpo cilíndrico y hueco abierto por ambos extremos, y un émbolo desplazable axialmente. Sobre el extremo anterior y abierto va acoplado a presión, desmontable y desechable, una cánula con un orificio extremo para el paso de las mucosidades por desplazamiento, hacia atrás del émbolo. En el interior de tal cánula va dispuesto un bloque de espuma, mientras que con posterioridad a un tabique diametral interno del cuerpo de la jeringa va montada una junta de estanqueidad ubicada en un cuello o tramo cilíndrico perteneciente al propio émbolo, cuyo tramo está entre la cabeza extrema de éste, con una configuración rómbica de vértices acusadamente redondeados, y un tramo tronco-cónico como parte delantera de
