self-inflating bag

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self-inflating bag (self-in-flayt-ing) n. a device for delivering emergency artificial ventilation by means of a tight-fitting face mask, a laryngeal mask, or an endotracheal tube. It consists of a stiff plastic bag, which is squeezed to deliver its gas contents into the patient's airway; when the pressure is released, it is reinflated from the atmosphere or an attached oxygen supply.