抄録
The invention of the swan type double bending gastrofiberscope solved the pending problem of observing the posterior wall of the upper part of the body of the stomach and the frontal view just below the cardia. It also made possible the close observation of the pyloric region which was another old pending wish of those using the gastrofiberscope. Moreover, this new scope can be inserted into the pyloric ring closely along the lesser curvature because the new scope had a lower bending part This fact is an unexpected fruit for the inventor and is now expected to form the basis of the development of the typical duodenofiberscope.
