The present invention comprises a constitution of a method of operating for an anal fistula wherein said anal fistula vanishes away by closing a primary opening of the purulent anal fistula developed round an anus, a constitution of a method of operating or an anal fistula wherein a primary opening is closed and the lower portion of the anal fistula is also cut away at the same time when secondary openings are developed at two portions of the anal fistula developed round an anus, a constitution of a method of operating for an anal fistula wherein a primary opening of the purulent anal fistula developed round an anus is closed and a part of a periproctal abscess is also incised at he same time, a constitution of a method of operating for an anal fistula wherein an internal hemorrhoid and an external hemorrhoid are ligated and cut away and a primary opening of the anal fistula developed in the anus portion is also closed at the same time when the anal fistula having the primary opening and a secondary opening in the anus portion and the internal hemorrhoid and the external hemorrhoid are developed, and a constitution of a method of operating for an anal fistula wherein a primary opening of one anal fistula is closed to be removed and a primary opening of the other anal fistula is also closed to be removed at the same time when the anal fistulas are developed at two portions round an anus.
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