IN-VITRO AND IN-VIVO EXPERIENCES WITH URETERORENOSCOPE BY GELET

Using ureterorenoscopes with unidirectional flow, the urologist faces a conflict between a good view on one hand and high pressure in the ur eter and the pelvic collecting system of the kidney on the other hand, The ureterorenoscope designed by Gelet, which has continuous (bidirec tional) flow and separate irrigation and working channels, was compare d with the instrument by Perez-Castro, which has a common irrigation a nd working access, The features investigated were optical quality, Bow -irrigation characteristics, and handling, The latest generation of ur eterorenoscopes provides small total diameters because of minimized wo rking channels and fiberoptic image and light transmission, These semi rigid instruments combine the features of flexible endoscopes and trad itional ureterorenoscopes, The Gelet instrument offers continuous flow , achieved by separation of the irrigation and working channel, and pr ovides a good view even when working instruments are inserted, The add itional outlet channel prevents high pressure in the ureter and renal pelvis and offers another access for instrumentation, if necessary, wh ich means maximum safety for the patient, Because the connection of ca mera and light source on a flexible system is separated from the instr ument, ureterorenoscopy is a more convenient procedure for the urologi st.