密闭式吸痰有利于维持良好的气道压力，可作为急性呼吸衰竭机械通气患者进行气管内吸痰时的首选方法。
The closed aspiration system could be the first choice for airway management, because it administered to keeping the normal airway pressure.
机械通气患者密闭式吸痰时不需脱离呼吸机，吸痰过程中可以保持持续通气，预防低氧血症。
The patients don't need to be separated from the mechanical ventilation and may keep continuous ventilation during suction, which can prevent hypoxemia.
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