Due to the deep position of the throat and the complex physiological structure, it is impossible to directly look through the throat. When examining the throat, special inspection methods are needed, such as an indirect laryngoscopy, direct laryngoscopy, fiberoptic laryngoscope, etc.
Indirect laryngoscopy is the most commonly used laryngeal examination method. The indirect laryngoscope is a flat circular mirror with a handle, the mirror and the handle intersect at 120 degrees, the diameter of the mirror is different, should be based on the subject’s pharynx situation to select the appropriate size of the indirect laryngoscopy.
Direct laryngoscopy requires a direct laryngoscope to directly raise the base of the tongue and epiglottis when inspecting the larynx. It is not a routine examination of the larynx because it is an invasive method of examination in the laryngeal examination and the patient is anesthetized on the mucosal surface. It is generally difficult to tolerate and usually requires hospitalization under general anesthesia.
The fiberoptic laryngoscope is currently the most widely used light guide fiber endoscope in Otolaryngology. The fiber laryngoscope uses the bendability of the light-transmitting glass fiber, the strong brightness of the fiber beam, and the ability to conduct light in any direction. The laryngoscope is made of a thin and soft mirror body, and the light source is a cold light source of a halogen lamp.
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