Endoscope channel with adjustable tube cavity caliber

The utility model discloses an endoscope channel with an adjustable tube cavity caliber, and relates to the technical field of medical instruments. The device comprises a fixing sleeve, a plurality of adjusting rods are annularly fixed to the bottom of the fixing sleeve at equal intervals, a plurality of adjusting pipes penetrate through the outer circle face of the fixing sleeve, channel expansion structures penetrate through the adjusting pipes, and fastening bolts extending into inner cavities of the adjusting pipes penetrate through the adjusting pipes. The end, located in the adjusting pipe, of the fastening bolt makes contact with the channel expansion structure. Through the combined use of the fixing sleeve, the adjusting rod, the adjusting pipe and the channel expansion structure, the size of the endoscope channel can be adjusted according to needs during use so as to be suitable for different endoscope sizes, various endoscope channels do not need to be arranged according to different conditions, the