Summary words: prevent cross-infection, safe, simple

(1) It can be divided into those with and without a transfer switch. It does not need to be separated from the ventilator, which minimizes the problems caused by the patient going offline midway.

(2) After inhalation, remove the suction tube from the artificial airway so that the gas flow will not interfere with the ventilator.

(3) Ensures positive end-expiratory pressure and prevents rapid hypoxic alveolar collapse.

(4) The PU film protects the airtightness of the sputum suction tube and prevents cross-infection.