A disposable nasopharyngeal airway (also known as a nasopharyngeal airway) is a common emergency device used to maintain the patient’s airway when artificial ventilation is required. It is mainly used in the following situations:

1. **Construction and materials**: Usually made of soft plastic or rubber, with one end slightly enlarged for insertion into the patient’s nostrils. The material selection ensures sufficient flexibility and durability while minimizing discomfort to the patient.

2. **Ventilation function**: The nasopharyngeal airway helps keep the airway open by inserting one end into the patient’s nasal cavity, allowing air to enter the patient’s airway smoothly. This is especially important for patients who are unconscious or facing airway obstruction.

3. **Single use**: The nasopharyngeal airway is usually used once, and each tube can only be used for one patient and should be discarded after use. This design can reduce the risk of cross-infection and maintain the cleanliness and safety of the equipment.

4. **Application scenario**: This device is commonly found in first aid kits or first aid kits on site. Especially when mouth-to-mouth or mask breathing is required, the nasopharyngeal airway can effectively help keep the airway open and provide necessary ventilation support.

Overall, the disposable nasopharyngeal airway is a simple and effective first aid device designed to ensure that measures can be taken quickly during the first aid process to maintain the patient’s airway open, thereby improving the first aid effect and success rate.