Fiber laryngoscope is currently the most widely used light-guided fiber endoscopy in otolaryngology. Fiber laryngoscopy using light-transmitting glass fibers can be bent, fiber beam brightness and can be directed in any direction of the characteristics of the light guide, made of mirror body thin and soft laryngoscope, the light source with halogen lamp cold light source. Fiber laryngoscopy system consists of three parts: the mirror body, cold light source and accessories. It can be inserted through the anterior nostril to examine the nasopharynx, oropharynx, laryngopharynx and larynx, so it is also called fiber nasopharyngeal laryngoscope. Fiber laryngoscopes have different types and specifications, and the commonly used fiber laryngoscopes have an effective length of more than 300mm, a distal end that can be bent upward by 90~130 degrees, and bent downward by 60~90 degrees, with a viewing angle of 50 degrees. At present, the outer diameter of the commonly used fiber laryngoscope is 3.2mm~6mm, which can be applied to the examination of children and adults, and the fiber laryngoscope has a lumen inside, which can be put into the forceps to carry out biopsy and surgery, and at the same time, the lumen can be used to carry on the negative pressure suction as well as the local administration of medication through the lumen of the larynx. The fiberoptic laryngoscope can be connected to a camera system and a computer system, which can be used to process the recorded images and video.

1 Advantages

(1) The body of the scope is soft and bendable, and the patient does not need a special position, so the pain and trauma are minimal, and it can be used for examination of neck deformities, difficulty in opening the mouth, and for frail and critically ill patients.

(2) It is easy to operate, and more conducive to the examination of various lesions in the larynx under the natural state of phonation.

(3)The end of the tube is close to the anatomical part, especially for the patients with short neck, hypertrophied tongue, narrow pharyngeal cavity and infantile epiglottis.

2. Disadvantages

The objective lens is small and the tube is long, which produces a fisheye effect, and the image is easily distorted and distorted with low color fidelity.