| 摘要 |
The present invention discloses a structural improvement of an oxygen mask which covers a nose without covering a mouth, wherein a respiration tube faces upward, an air inlet tube is located at a center of an exterior side of the respiration tube and an inner tube of the air inlet tube is extended into the respiration tube. A patient breathes in oxygen from the air inlet tube and breathes out from a tube opening of an exhale tube at an upper end, so that he or she can inhale more oxygen.
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