Oxygen absorbing tubes can be replaced once every 7 to 10 days. Oxygen absorbing tubes are relatively inexpensive and you can keep extra at home for replacement. Patients with chronic bronchitis, especially those with respiratory failure, may be involved in long-term oxygen therapy at home and indoors. Theoretically, oxygen tubing is a disposable item, but most of it is used by one person, so there is no question of sharing it among multiple people, and it can be used for about 7 to 10 days and replaced once. Oxygen absorbing tubing is unidirectional, so it is mainly the part that delivers oxygen that comes into contact with the body, especially the nose and mouth. When inhaling oxygen, you should first insert the oxygen tube, turn on the main oxygen switch, and make sure that the oxygen tube is clear, and then wear the oxygen tube appropriately when the oxygen flow is moderate. If a lot of secretions are adhered, it should be replaced at any time to prevent cross-infection. At the same time, a humidifying bottle should also be used for oxygen intake, with the purpose of humidifying the oxygen and avoiding over-drying of the respiratory tract. Patients are advised to use and change it under the proper guidance of the doctor when they start using it.