Insertion device of intrauterine devices, in particular for the insertion and positioning inside the matrix of a living being of intrauterine devices for contraception, comprising an elongated main body provided internally with a through hole extending along the length of the entire main body, and through which a cannula assembly is displaceable, characterized in that the cannula assembly comprises a cannula coupled at its upper end to a hollow inner support through which an insertion plunger is displaceable； it includes a flexible tube insertable inside the cannula, in which end-stroke guiding means are arranged between the support and the insertion piston, the outer face of the support having a projection protruding outwards while the main body presents a longitudinal groove extending from the upper end through which the the said longitudinal groove includes a graduated scale formed by a plurality of cavities spaced apart equidistantly from one another and arranged laterally along the longitudinal groove in which the projection of the support is capable of being positioned. (Machine-translation by Google Translate, not legally binding)1. Aparato insertador de dispositivos intrauterinos, en particular para la inserción y posicionamiento en el interior de la matriz de un ser vivo de dispositivos intrauterinos para la contracepción, comprendiendo un cuerpo principal alargado provisto interiormente de un orificio pasante que se extiende a lo largo de todo el cuerpo principal, y a través del cual es desplazable un conjunto de cánula, caracterizado por el hecho de que el conjunto de cánula comprende una cánula acoplada por su extremo superior a un soporte interior hueco a través del cual es desplazable un émbolo de inserción que incluye un tubo flexible insertable en el interior de la cánula, en el que se disponen unos medios de guiado de final carrera entre el soporte y el émbolo de inserción, presentando la cara exterior del soporte un resalte que sobresale hacia fuer
