Methods and devices for introducing a colonoscope. An head of an endoscopic guide includes a balloon configured to accommodate a magnetic or ferromagnetic agent. A magnetic field source is configured to generate a magnetic field to exert a retaining force on the magnetic or ferromagnetic agent contained in the endoscopic balloon. The magnetic field is applied using the magnetic field source externally at an area of an abdomen of the patient in which the expanded endoscopic balloon with the magnetic or ferromagnetic agent is present to attract the endoscopic balloon against an anchoring point on a wall of the colon with a retaining force on the magnetic or ferromagnetic agent. The endoscopic guide is put in traction by applying a pulling force on the proximal end of the endoscopic guide to keep the endoscopic guide tensioned and to reduce curvature of loops of the colon.L'invention concerne un guide endoscopique pour cathéters et endoscopes comprenant un élément de guidage tubulaire, une tête d'ancrage, ladite tête d'ancrage étant pourvue d'au moins un récipient destiné à recevoir un agent magnétique, le récipient étant relié à ladite cavité longitudinale de l'élément de guidage, un agent magnétique qui peut se déplacer dans ladite cavité longitudinale afin de remplir/vider le récipient et une source de champ magnétique manoeuvrable manuellement.
