Abstract: The device includes: a first catheter having dilators, a first inflatable balloon active between an inflated configuration, in which the first inflatable balloon is filled with a pressurised fluid and extends in a radial direction away from the first catheter, and a deflated configuration; elements for sending the fluid to the first inflatable balloon; an external tube, axially slidable on the first catheter, for covering and uncovering the first inflatable balloon in the deflated configuration; a second catheter internally insertable in the first catheter and having an internal passage for a metal guide wire; a second inflatable balloon active between an inflated configuration, in which the second inflatable balloon is filled with a pressurised fluid and extends in a radial direction away from the second catheter, and a deflated configuration; elements for sending fluid to the second inflatable balloon.