The present invention is installed in esophageal fistula formation safely , maintain , and further reduction of patient discomfort and a fistula possibly an object of the invention to provide a button that . In order to achieve the ; The above object , according to the present invention , provided with a flange (2) to the rear end of the round , and the shaft portion (1) the distal end to form a fistula button 9 . More specifically, the shaft having a flange at the rear end which is the front end portion is rounded and has a communication with a circular lumen cross sectional shape to the flange portion from the shaft portion , a flat, fluid in the flange portion having a substantially circular shape a means for securing the catheter , and the opening of the flange portion to form a fistula button 9 provided by the seal means .
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