Guide sheath tube, endoscope assembly and detection method

The invention relates to the technical field of endoscopes, in particular to a guiding sheathing canal, an endoscope assembly and a detection method, the guiding sheathing canal comprises a base body and a photoresistor, the base body is provided with a cavity channel, the cavity channel penetrates through the base body in the axial direction, the cavity channel is used for penetrating through an insertion part of an endoscope, the base body is provided with a light-transmitting area, the photoresistor is arranged in the light-transmitting area, and the photoresistor is arranged in the light-transmitting area. And the light facing surface of the photoresistor corresponds to the cavity channel, so that image transmission delay detection of the camera module on the endoscope is realized. Whether image transmission delay exists in the camera module of the insertion part or not can be accurately detected at the initial stage of use of the endoscope, the surgical risk is reduced, in addition, image transmission de