An insertion device IV catheter, comprising an outlet catheter (3) in the proximal end of a tubular catheter (3a), an outlet needle (2) with an attached hollow needle (2a), the hollow needle extending through the catheter plug and the tubular catheter (3a) in the prepared position, so that the needle tip protrudes distally from the distal end of the tubular catheter, and - a needle protection element; characterized in that it also includes; - a tubular protective cylinder (1) that is releasably attached to the catheter plug (3) in a prepared position, where the needle plug (2) can be displaced in the tubular protective cylinder (1), and why - the needle protection element (4) has a proximal rear wall (4.1) that is fixed at a distal end area of the tubular protective cylinder (1) by means of clamping members (6), and - where the protective cylinder Tubular (1) and catheter cobo (3) are retained in the needle protection element (4) in the prepared position, and the needle protection element (4) is released from the catheter plug (3) in a protected position in which the needle protection element covers the needle tip.Un dispositivo de inserción de catéter IV, que comprende un enchufe de catéter (3) en el extremo proximal de un catéter tubular (3a), un enchufe de aguja (2) con una aguja hueca unida (2a), extendiéndose la aguja hueca a través del enchufe de catéter y el catéter tubular (3a) en la posición preparada, de manera que la punta de aguja sobresale distalmente del extremo distal del catéter tubular, y - un elemento de protección de aguja; caracterizado por que, además comprende; -un cilindro protector tubular (1) que está unido de manera liberable al enchufe de catéter (3) en una posición preparada, en donde el enchufe de aguja (2) se puede desplazar en el cilindro protector tubular (1), y por que - el elemento de protección de aguja (4) tiene una pared trasera proximal (4.1) que está fijada en un área extrema distal del cilindro protector tubular (1) por medio