“…As a result of the recent development of fibre optics, it has become possible to design a gastroscope with a flexible shaft (Curtiss, Hirschowitz, and Peters, 1957;Hirschowitz, Curtiss, Peters, and Pollard, 1958) and preliminary reports on an instrument using this optical principle have already appeared (Hirschowitz, 1961;LoPresti, Scherl, Greene, and Farrar, 1962). This instrument has been available in Britain since 1961 and there have been several early comments on its value (Avery Jones and Kellock, 1961;Burnett, 1962a and b;Kemp, 1962). The present report describes the technique which has been evolved for use with this new type of gastroscope.…”