![]() This optical element has a fixed viewing angle depending on the maker. Rigid endoscopes are used in various forms of endoscopies and consist of a long rigid tube and an optical element at the distal tip. Imaging devices are usually linked to the proximal end of the scopes allowing a zoomed and more detailed inspection. Any abnormalities indicating the presence of NPC can thus be observed. The scope will be inserted through the nasal passages until the professional is able to see the nasopharynx. ![]() The process is usually done by professionals using either a rigid or flexible fiber optic scope. Nasopharyngoscopy or nasal endoscopy is the process of evaluating the nasal passages via optics. Hongliang Ren, in Flexible Robotics in Medicine, 2020 13.2 Prior art and design criteria
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