Apparatus for cleansing a colon of a patient, the apparatus including a foldable feed tube having a portion folded within another portion of the feed tube the folded portion unfolding under pressure of fluid inflow, the unfolding proceeding by eversion (turning inside-out), whereby the eversion of the folded part adds to the length of an unfolded part of the feed tube, thereby extending its length a fluid source arranged to feed fluid into the feed tube to inflate the folded portion of the feed tube, thereby unfolding and extending the feed tube into the colon of the patient the feed tube conducting the fluid into the colon and permitting exit of the fluid from the feed tube through at least one aperture, the exit aperture allowing cleansing of the colon by the fluid flowing one way outside of the feed tube in most of the colon in the direction from the cecum toward the anus of the patient, the fluid in the feed tube flowing one way in the opposite direction and a drainage channel configured for its insertion through the anus, the inner end of the drainage channel opening into the rectum behind the anus upon insertion, at least a part of the drainage channel including at least two sub-channels, of which at least one sub-channel conducts washing liquid into the patient and at least one other sub-channel drains the washing liquid out of the patient, thereby separating inflow and outflow, the liquid inflow reaching the colon via the feed tube, the outflow resulting from drainage of the colon cleansing.Cette invention concerne un appareil permettant de nettoyer le côlon dun patient, lappareil comprenant un tube dintroduction pliable doté dune portion pliée à lintérieur dune autre portion du tube dintroduction la portion pliée se déplie sous la pression dun fluide entrant, le dépliement seffectuant par éversion (retournement vers lintérieur), léversion de la partie pliée sajoutant à la longueur dune partie non pliée du tube dintroduction et permettant daugmenter sa long
