oxygen therapy

A Venturi mask mixes oxygen with room air, creating high-flow enriched oxygen of a desired concentration.

https://www.rtmagazine.com/

The non-rebreathing oxygen mask enables the delivery of high concentrations of oxygen

https://www.nursingtimes.net/

A nasal cannula is an oxygen delivery device frequently used by patients with COPD. It may be used in a hospital, at home, or on-the-go (隨時隨地).

https://www.verywellhealth.com/