Abstract
In order to simplify the procedure and to improve visuality in cholangiography we devised a new model of a duodenof iberscope by making the visual direction of the Olympus JF-B3 15 degrees backward. By applying the new model to examination for 51 patients with a suspicion of the pancreas or biliary tract of diseases, we could cannulate a tube through the new fiberscope at a rate of 98%, a rate of visualization was 87% in selective retrograde cholangiography, and 97% in selective retrograde pancreatography, respectively. Although we could not obtain a signiticant increase in the success rate of cholangiography, we could observe vater's Ampulla more clearly from downward under good visual control of the cannule than by using the original JF-B3. However, it may be necessary to add a further ability to the new scope to cover a forward view in addition to a backward view so that it can be used for routine examination of the upper digestive tract by making insertion of the scope easier.
