Retractable device for introducing solids into a cavity, in particular applicable for introducing a solid or semi-solid material (2) into a natural or artificial cavity, characterized by comprising three tubular bodies (3, 4, 5) of diameters or variable width and length, which are coupled to each other with axial sliding between them, consisting of two hollow tubes, one internal (3) and one external (4), and a plunger (5)； where the inner tube (3), which is of constant diameter, slides inside the external tube (4) to pass from a filling position, in which the distal incisal end (3a) of the inner tube (3) protrudes in a section (31) to the distal end (4a) of the external tube (4), to a emptying position, wherein said section (31) of the distal incisal end (3a) of the inner tube (3) is flush with the distal end (4a)) of the external tube (4), determining the deposition of said material (2) in said cavity without applying positive pressure by the displacement of the plunger (5) inside the internal tube (3), when said distal incisor end (3a) is located inserted in the cavity and provided with material (2). (Machine-translation by Google Translate, not legally binding)1. Dispositivo retráctil para introducción de sólidos dentro de una cavidad, en particular aplicable para introducir un material (2) sólido o semisólido dentro de una cavidad natural o artificial, caracterizado por comprender tres cuerpos (3, 4, 5) tubulares de diámetros o anchura y longitud variables, que se acoplan entre sí con deslizamiento axial entre los mismos, consistiendo en dos tubos huecos, uno interno (3) y uno externo (4), y un émbolo (5)； donde el tubo interno (3), que es de diámetro constante, se desliza dentro del tubo externo (4) para pasar de una posición de llenado, en que el extremo incisivo distal (3a) del tubo interno (3) sobresale en un tramo (31) al extremo distal (4a) del tubo externo (4), a una posición de vaciado, en que dicho tramo (31) del extremo incisivo distal (3a) del tubo in
