Which airway adjunct device is a flexible rubber or plastic tube designed to be inserted into the nose?

The nasopharyngeal airway is specifically designed to be inserted into the nasal passage, making it an ideal choice for patients who are semiconscious or unconscious but still have a gag reflex. This device, constructed from flexible rubber or plastic, allows for unobstructed airflow by bypassing potential blockages in the oral cavity or pharynx. The design of the nasopharyngeal airway facilitates passage through the nose into the nasopharynx, and its flexibility helps in accommodating the anatomical contours of the airway, reducing the risk of trauma during insertion.

In contrast, the oropharyngeal airway is inserted through the mouth and is intended for patients who are unconscious and do not have a gag reflex; it would not be suitable for use in the nasal cavity. The endotracheal tube is a more invasive device that is placed directly into the trachea, primarily by advanced providers during intubation procedures, and is not designed for nasal insertion. A suction catheter is used for clearing obstructions from the airway rather than maintaining airway patency. Therefore, the nasopharyngeal airway is correctly identified as the airway adjunct designed for nasal insertion.