Patent ID: 7166115
Filing Date: 2007-01-23
Classification: A61B

Abstract:
1. A ligation treating apparatus which is attached to a tip of an endoscope for carrying out ligation of a varicose vein, comprising: an inner cylindrical portion which is connected to the tip of the endoscope; a plurality of ligation rings which are aligned and held on an outer circumference of the inner cylindrical portion with diameters thereof elastically expanded and are guided by the inner cylindrical portion and movable toward the front end of the inner cylindrical portion; an outer cylindrical portion which surrounds the inner cylindrical portion via the ligation rings and forms a cylinder portion by use of space between the inner cylindrical portion and the outer cylindrical portion; an annular piston member which is provided in the cylinder portion in direct contact with a rearmost ligation ring and can push the ligation rings toward the front end of the inner cylindrical portion; a first air passage for introducing air to drive the piston member forward into the cylinder portion on the rear side of the piston member; air introduction means for forcing a given amount of air into the cylinder portion via the first air passage; an annular groove which is formed along the entire outer circumference of a front end of the inner cylindrical portion so that the foremost ligation ring is fitted and held in the groove releasably; a second air passage which branches off from the first air passage and extends along the inner cylindrical portion; and an air discharge port which is communicated with the second air passage and opened at the bottom of the annular groove; wherein the air discharge port is blocked by a ligation ring fitted in the annular groove and opened when the ligation ring is moved out of the annular groove by the press force of the piston member and discharges air fed from the air introduction means to the cylinder portion so as to stop the piston member.