Abstract: The invention consists of an expansion catheter for intrauterine placement, featuring anatomical characteristics adaptable to the different morphologies of the uterine organ in its internal cavities, and which efficiently enables the dilatation and separation of the internal walls of the cavity subsequent to their reduction in the surgical process of endometrial scraping in the different surgical techniques of the procedure, in order to serve as a separator and isolator in the prevention of intrauterine adhesions, facilitating drainage both internally through the device and perimetrally. The device, containing an expansion device in a collapsed state, is placed in the uterus by means of an insertion device with the aid of a pusher, which is discarded together with the insertion device once the unit is in place.