Abstract
This paper presents experiences with a new f iberscope, FG-28A, Asahi. This f iberscope is forwardviewing and f ixedf ocusing. The effective length is 1, 130 mm and the angle of view is 76°. One of the most important characteristics of this fiberscope is a medium-sized caliber of the shaft (9.5 mm), in order to reduce the disadvantages of other types of fiber-scope with too large or too small caliber. This fiberscope has been used clinically in 289 cases of routine upper G-I. examinations including 7 cases of EPCG. The insertion with this FG-28A was as easy as that with other conventional small-calibered f iberscopes. The stomach and duodenum were entirely observed, but the most difficult part in observation of the stomach was middle and lower posterior wall of the body. It was also rather difficult to observe the greater curvature of the duodenal bulb just distal to the pyloric ring. These would be a common disadvantages with forward-viewing fiberscopes. The image of this scope is sharp enough and photography with this scope is almost satisfactory. EPCG was also possible though it was more difficult to obtain the duodenal papilla from the anal side with thid scope than with other small-calibered scopes. Biopsy specimens taken were large enough in size for pathological evaluation even though a biopsy forceps for this scope is somewhat small (2.4 mm).
