?:definition
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Artificial airways designed for insertion through one of the nostrils, permitting the passage of oxygen to the lungs. These airways typically consist of a hollow, curved plastic tube with a protruding rim (flange) at the proximal end; when the airway is inserted, the flange rests against the nostril, the curvature of the artificial airway follows the contour of the floor of the nose, and the distal end opens into the posterior pharynx. Nasopharyngeal artificial airways are available in several sizes to accommodate the patient\'s anatomic characteristics. They are intended for use in unconscious or semi-conscious patients who cannot maintain an open natural airway; insertion of the artificial airway should be performed only by trained healthcare personnel. Suction through the airway may be performed using appropriate catheters.
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