A gastro-fiberscope equipped with a glassfiber light guide has been developed in Japan and we had the opportunity to first use it clinically. In comparing it with the Hirschowitz's Gastroduodenal Fiberscope made in U. S. A., this fiberscope has following features. In contrast with reddish hue in the image guide of Hirschowitz's instrument, this apparatus has clear transparent image guide rendering a quite natural color image. The light guide has advantages to prevent tissue damage due to heating by the lamp at the tip when prolonged intense lighting is required in cinematography and TV, to use lamp outside.
