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See Chinese contents: YY/T 1543-2017 YY/T 1543-2017: Nasal oxygen cannula
This Standard stipulates the requirements of nasal oxygen cannulas intended to deliver medical oxygen, oxygen-enriched air (oxygen 93 percent) and other oxygenated medical gases for breathing to patients. This Standard is applicable to all the nasal oxygen cannulas, either independent nasal oxygen cannulas or nasal oxygen cannulas used to connect to humidification bottles and masks.
