A method of conducting a clinical procedure, including providing an endoscope having an instrument channel in communication with a lumen providing a catheter adapted to be inserted through the instrument channel, the catheter comprising a tip having a guide tube portion, and a plurality of openings at a distal end of the catheter in the vicinity of the tip, the plurality of openings adapted for ejecting an irrigation fluid into and for sucking waste fluid from the lumen inserting the catheter through the endoscope such that the tip protrudes into the lumen providing and ejecting an irrigation fluid into the lumen through the openings sucking waste fluid from the lumen through the openings and withdrawing the catheter from the lumen and the endoscope.
