Clinically, 1-time aspiration tubes are used to extract sputum from the respiratory tract. 1-time aspiration tubes can be divided into six models according to different sizes of tube diameters: F6, F4, F8, F10, F12 and F16. Aspiration tubes are made of medical polymer materials, mainly with catheters and connectors, and are used strictly under aseptic conditions. It is chosen according to the patient’s own condition, and physical conditions, and the size of the respiratory lumen, and is mainly used to extract sputum from the trachea, or a large amount of other secretions, to prevent the emergence of restricted respiratory function, or even cause asphyxia and respiratory failure.