PROBLEM TO BE SOLVED: To provide a duct expansion device capable of expanding an observation range of the interior of a lumen, and an endoscope system.SOLUTION: The endoscope system includes: a catheter 30 a seal part 60 that is provided at a distal end of the catheter 30 and opened at the distal end a narrow-diameter tube 71 that is inserted into the catheter 30 and the seal part 60 and is movable in the catheter 30 along the axial direction an endoscope 10 that is inserted into the catheter 30 and the seal part 60 and is movable in the catheter 30 along the axial direction a nano balloon 72 that is provided at a distal end of the narrow-diameter tube 71 and is inflatable by protruding from the opening at the distal end of the seal part 60 a first injector 50 that is connected to a proximal end of the catheter 30 and injects fluid to the catheter 30 and a second injector 73 that is connected to a proximal end of the narrow-diameter tube 71 and injects fluid to the narrow-diameter tube 71 and the nano baloon 72.COPYRIGHT: (C)2015,JPO&INPIT【課題】管腔内の観察範囲を広げることができる管路拡張装置及び内視鏡システムを提供する。【解決手段】内視鏡システムは、カテーテル30と、カテーテル30の遠位端に設けられ、遠位端で開口したシール部60と、カテーテル30及びシール部60に挿通され、カテーテル30内を軸方向に沿って移動可能な細径チューブ71と、カテーテル30及びシール部60に挿通され、カテーテル30内を軸方向に沿って移動可能な内視鏡10と、細径チューブ71の遠位端に設けられ、シール部60の遠位端の開口から突き出て、膨張可能なナノバルーン72と、カテーテル30の近位端に接続されて、カテーテル30に流体を注入する第一注入器50と、細径チューブ71の近位端に接続され、細径チューブ71及びナノバルーン72に流体を注入する第二注入器73と、を備える。【選択図】図1
