With the continuous expansion of the application field of hyperbaric oxygen therapy and the innovation of oxygen supply terminals, the oxygen supply method has also developed from the original single lung oxygen supply to two types: lung oxygen supply and continuous oxygen supply. Therefore,Metal tube rotor flowmeterThere are also new applications in clinical practice. One common usage is the application of metal tube rotor flow meters in pulmonary oxygen supply. This usage can be conveniently and intuitively observed qualitatively on the flow meter, mainly observing the effective oxygen inhalation situation and the instantaneous flow rate of each oxygen inhalation by the patient. If the instantaneous flow rate is small or non-existent, it indicates that the patient's face mask is not properly worn and there is a leak in the contact area between the face and the mask. The cabin operator uses this observation to guide the patients in the cabin to correct the adverse conditions in a timely manner and ensure effective oxygen inhalation. The second is to expand the usage, that is, the metal tube rotor flowmeter is applied to continuous oxygen supply. The flow meter serves as both a switch and a flow regulator, allowing for quantitative adjustment of the flow rate. Cabin operators adjust the oxygen supply flow rate by observing the size of the balloon at the oxygen terminal inside the cabin. This use of the flow meter ensures effective oxygen supply, but it is still necessary to closely monitor the airtightness of the patient's oxygen terminal to prevent oxygen leakage and high oxygen concentration in the cabin. These two uses of metal rotor flow meters solve the oxygen inhalation needs and effective oxygen inhalation problems of various patients, benefiting more patients.