Release device for actuation of an introduction catheter (12), comprising an outer shell (16) and a stylet (14) arranged so that it can be moved in the outer shell (16), with an elongated handle (26) , a fixing housing (46) arranged in the handle (26), which is designed to fix in the handle (26) a piece of proximal end of the stylet (14) so that it cannot move with respect to the longitudinal axis of the handle (26), and a guide (40) configured in the handle (26) that is designed to accommodate a drive element (18, 48) disposed in the proximal end zone of the outer shell (16) so that it can move with respect to the longitudinal axis of the handle (26) and with respect to the stylet (14), in which the handle (26) comprises an elongated base part (28) and an elongated adjustable part (30) joined with the part base (28), which can be adjusted along the longitudinal axis of the part of base (28), being able to change the adjustable part (30) between an adjustment state, in which the adjustable part (30) is held in the base part (28) axially movable for a modification of the length of the guide (40), and a blocking state, in which the adjustable part (30) is locked in the base part (28) at least axially.Dispositivo de liberación para el accionamiento de un catéter de introducción (12), que comprende una envoltura exterior (16) y un estilete (14) dispuesto de manera que puede desplazarse en la envoltura exterior (16), con una manija alargada (26), un alojamiento de fijación (46) dispuesto en la manija (26), que está diseñado para fijar en la manija (26) una pieza de extremo proximal del estilete (14) de manera que no pueda desplazarse con respecto al eje longitudinal de la manija (26), y una guía (40) configurada en la manija (26) que está diseñada para alojar un elemento de accionamiento (18, 48) dispuesto en la zona de extremo proximal de la envoltura exterior (16) de manera que pueda desplazarse con respecto al eje longitudinal de la manija (26) y con respecto al estil
