PROBLEM TO BE SOLVED: To provide an insertion assisting tool for an endoscope which includes an operating mechanism for switching tubes through which washing water or the like for an observation window and a lighting window of an insertion portion of the endoscope into opening condition or closing condition, and works as follows: one of two tubes is turned into opening condition and another tube is turned into closing condition by a primary stage operation of an operation member, and both of the tubes are turned into opening condition by a secondary stage operation of the operation member.SOLUTION: In the insertion assisting tool 10 attached to a rigid endoscope 12, a handle portion 30 is provided at the proximal end of a sheath insertion portion 14. In the handle portion 30, a tube for supplying CO2 gas and a tube for supplying washing water are inserted into a nozzle at the distal end of the sheath insertion portion 14. When an air- and water-sending lever is pushed down by one stage, the end part of a torsion coil spring 94 is pushed down by the air- and water-sending lever to open the tube for supplying the gas, and when the lever is pushed down further by one stage, the end part of a return coil spring 96 is pushed down by the air- and water-sending lever to open the tube for supplying the liquid.COPYRIGHT: (C)2013,JPO&INPIT【課題】内視鏡挿入部の観察窓、照明窓の洗浄水等を流通させるチューブを開状態と閉状態とで切り替える操作機構を備えた内視鏡用挿入補助具において、操作部材の1段目の操作により、2つのチューブのうちの一方を開状態、他方のチューブを閉状態とすることができ、2段目の操作で両方のチューブを開状態にする内視鏡用挿入補助具を提供する。【解決手段】硬性内視鏡12に装着される挿入補助具10はシース挿入部14の基端側にハンドル部30が設けられる。ハンドル部30には、シース挿入部14の先端のノズルにCO2ガスを供給するチューブと洗浄水を供給するチューブが挿通される。送気送水用レバーを1段押下げると、捩りコイルばね94の端部が送気送水用レバーにより押下げられてガス供給チューブが開放され、更に1段押下げると、戻りコイルばね96の端部が送気送水用レバーにより押下げられて液供給チューブが開放される。【選択図】図1
