ENDOSCOPIC OVERTUBE, TREATMENT INSTRUMENT AND ENDOSCOPE INCORPORATED INTO ENDOSCOPIC OVERTUBE, AND TREATMENT INSTRUMENT SYSTEM INCLUDING ENDOSCOPIC OVERTUBE

摘要

An endoscopic overtube of the present invention includes an endoscope insertion passage through which an endoscope is inserted, a treatment instrument insertion passage through which a treatment instrument is inserted, and an ultrasound transmission medium distributor capable of distributing an ultrasound transmission medium from the treatment instrument insertion passage to the endoscope insertion pass age. The thus configured endoscopic overtube of the present invention can hold the ultrasound transmission medium, excel in placing the ultrasound transmission medium, and smoothly supply the ultrasound transmission medium into the treatment instrument insertion passage.