The principle of a fiber optic endoscope is similar to that of an optical mirror. In order to enter the smaller holes, we choose a fiber optic endoscope. The clarity of the fiber optic endoscope depends on the number of fiber bundles.

Fiber endoscope: apex part, bending part, insertion part, operation part, light guide hose, light guide connecting part, and the apex part of the eyepiece into a small rigid section, there are direct-viewing type (front-viewing type), side-viewing type, strabismus-viewing Mode. The gastroscope and colonoscopy adopt the direct view method, and the duodenoesophagoscope adopts the side view method. There are: objective lens hole (image guide beam), light hole (light guide beam), air and water hole (nozzle), and biopsy hole on the top of the apex. The bending part adopts the method of pulling by four steel wires. The head has four steel wires connected to the control part. By twisting the upper, lower, left, and right handwheels of the control part, the steel wires in different directions can be pulled respectively, so that the bending head swings in the corresponding direction. (portable video endoscope) There are light guides, image guide beams, various pipes and traction devices, bending pipes and bending rubbers in the bending part.

The hose part includes a bending part and an insertion part, also called a coil. It is equipped with light guide, image guide beam, water and gas pipeline, biopsy pipeline (also suction pipeline), traction steel wire, outsourcing stainless steel belt hose and metal mesh tube, and the outer layer is a smooth plastic sleeve. The fiber bundle that transmits the image constitutes the core part of the fiber endoscope. It consists of tens of thousands of extremely fine glass fibers. According to the principle of optical total reflection, all glass fibers must be covered with a film with a lower refractive index. It is guaranteed that all the light transmitted by the inner core fiber can be totally reflected. The transmission of a single fiber can only produce one light spot. In order to see the image, a large number of fibers must be assembled into bundles. If the image is to be transmitted to the other end to form the same image, each fiber must be in its own position. The two ends are arranged in the same position, which is called the guide beam. When a guide beam is disconnected, there will be one more black spot in the image. The light guides do not need to be arranged in the same position, and the brightness will be significantly reduced if a lot of them are disconnected.

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