The oxygen bag has a limited amount of oxygen stored inside, and depending on the frequency of the patient’s oxygen intake, it can be clear how long to suck. If the normal low flow rate is used, such as 1-2L/min flow rate, the oxygen will be sucked up in about half an hour or so, and if the oxygen is sucked at a high flow rate, it may be sucked up in 5-10 minutes. Therefore, if the patient’s condition is more urgent in the case of emergency, when escorting to the emergency department, you can temporarily use oxygen bags to ensure the oxygen supply, long-term oxygen intake or to choose the regular central oxygen supply, can ensure an adequate supply of oxygen.