The present invention relates to a single-use device to be used in surgery each time that a vascular approach by means of cannulation or catheterization is deemed indispensable (cardiopulmonary bypass, anesthesia, emergencies, resuscitation), particularly during cardiac surgery or interventional cardiology. Said novel device substantially includes a body (5), a sealing system consisting of two inflatable diskettes (4), a control connector for inflating and deflating the diskettes (4), a tubular unit (6) and a flexible guide (1).