The widely used type is the simple oxygen mask. The oxygen mask is used for non-life threatening conditions that may deteriorate. For example, if the patient is admitted to the hospital with chest pain, the doctor is likely to wear a simple mask.
It can be set to deliver a certain amount of oxygen to the patient, but the oxygen may be diluted by the air in the room. Therefore, if the oxygen mask is loosely installed, a large amount of air may enter and mix with oxygen.
There is a device called an oxygen concentrator that can be connected to a simple oxygen mask to help control the oxygen concentration. It can help, but it cannot fully control the oxygen flow.
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