PROBLEM TO BE SOLVED: To obtain an ultrasonic endoscope that can easily describe a treatment instrument of a flexible line shape in an ultrasonic tomographic image without relying on capability of an operator in the ultrasonic endoscope in which an ultrasonic probe that obtains an ultrasonic tomographic image of an observation region is disposed in an insertion part distal end, and a forceps channel to project the treatment instrument of a flexible line shape in an ultrasonic tomographic image of an ultrasonic probe is opened in the insertion part distal end.SOLUTION: An ultrasonic endoscope makes a forceps channel meander in a plane including an ultrasonic scanning plane of an ultrasonic probe near the opening.COPYRIGHT: (C)2014,JPO&INPIT【課題】挿入部先端に、観察部位の超音波断層像を得る超音波プローブを設け、同挿入部先端に、超音波プローブの超音波断層像内に可撓線状処置具を突出させるための鉗子チャンネルを開口させた超音波内視鏡において、可撓線状処置具を、術者の技量に頼ることなく、超音波断層像内に容易に描出させることができる超音波内視鏡を得る。【解決手段】鉗子チャンネルを、上記開口の近傍において、超音波プローブの超音波走査平面を含む平面内において蛇行させた超音波内視鏡。【選択図】図6
