著者

中原 朗 大木 一郎

出版者

一般社団法人 日本消化器内視鏡学会

雑誌

日本消化器内視鏡学会雑誌 (ISSN:03871207)

巻号頁・発行日

vol.18, no.5, pp.727-745, 1976

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High frequency oscillators have been developed and utilized for endoscopic polypectomy. Animal experiments were performed before applying them clinical trials. The results obtained from animal experiments and the findings by clinical trials were reported.1. Among oscillators, a transistor type which can provide a regular wave seemed to be most suitable. One with a built-in timer as a safety device is preferable.2. Degree of changes in the mucous membranes caused by high frequency current were almost proportional to the intensity and time of flow of electric current, however they were inversely proportional to the size of the area of the mucous membrane where an electrode were attached.3. Pathological study showes that changes in the tissues induced by coagulating wave sometimes continued to proceed over 1-2 weeks. Therefore, while performing polypectomy it is desirable to try to leave a polyp root by 3-5 mm in length.4. The size of a postoperative ulceration and the days required for its healing were dependent upon the thickness of pedicle, the duration of current flowed, and the place where the snare was set.5. Postoperative bleeding sometimes occured in cases in which the polyp had been removed with incomplete coagulation.6. Endoscopic polypectomy could be a perfect biopsy method which can cover demerits of usual biopsy methods. Further histological studies on removed polyps could provide the in formation for the definitive treatment of malignant polyp.7. We believe that there would be no accidental complications with enough understandings of properties of cutting and coagulating wave.