To properly use a rigid endoscope, you should understand its structure. At present, the products of various hard tube endoscope production plants in the world have different optical paths and different appearances, but their basic structures are the same: they consist of a working mirror tube part, a structural part, an eye mask part, and an optical cable interface part. The main body portion of the structure, the eye mask portion, and the cable interface portion are not easily damaged except for severe bumping. The most vulnerable part is the working mirror tube section. Taking a φ4mm rigid endoscope as an example: the working mirror tube is mainly composed of four parts: an outer tube, an endoscope tube, an optical lens, and an optical fiber. The optical lens is placed in the endoscope tube to form an optical system, and the optical fiber is placed between the inner and outer mirror tubes for illumination. The outer tube is a 0.1mm thick φ4mm stainless steel tube that is deformed by bumping or squeezing. Most of the optical lenses are glass columns of φ2.8mm and 25mm long. They will crack, collapse or shift the optical axis when they are slightly bumped and squeezed. Our common endoscopes have blurred vision and black edges. the reason. The optical fiber is made of extremely fine optical glass. A φ4mm speculum should be installed with more than 1500 pieces. In the outer tube, external force will cause the broken wire to affect the illuminance. The connection of the various mechanisms of the rigid endoscope is mostly bonded with epoxy glue. The quality of the glue and the packaging technology also affect the service life of the speculum. Although the rigid endoscope is delicate, it will not be damaged as long as it can be used and maintained correctly.