Abstract
Remodelling Olympus GIF-D2, a magnif ing scope have been manufactured for trial. This instrument have a object lens of long focal distance and 50-degree angle of orthoptic viewing. An object is continuously magnified, as the scope approach it. The maximal magnif ing power, which is gained when tip of scope sticks to objects, is fifteen times. Magnif ing views through the scope are similler to those through dissecting microscope with equal magnifications. Target biopsies can be accurately done with the scope, even at the time of close-up observation. This scope would be available for precise examinations, as well as for primary examinations of upper gastroint-estinal tract. In order to prevent hilights and to clear minute findings through magnifing scope, dye scattering method was appried. In this studies gastric mucosa, intestinal metaplasia and various lesions of the stomach were observed. In f undic area, regularly arranged, round or oval papillae were seen and capillary vessels were also seen after dye solution washed out. In pyloric mucosa, the papillae were slender in shape and irregular in size and arrangement. Intestinalized gastric mucosa were observed after staining by methylene blue, according to our in vivo staining method. In this lesions, four types were classified from staining patterns, from type "a" to "d". Staining became more remarkable alphabetically, and tye "d" was similler to villi of the duodenum. In other gastric lesions, changes of papillae, capil-lary vessels and other minute findings were exaggra-ted. Differentiation of benign and malignant lesions has become more easy and more accurate.
