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This design is mainly used to avoid infectious disease caused by direct contact between mouth and mouth in artificial respiration, but also can solve the embarrassment of kissing strangers directly. This design idea comes from a case of a drowning man who died due to the lack of timely artificial respiration. Its styling is in line with ergonomics, and its upper part and the lower part is vertical, because mouth are staggered when rescuing; the part is concave elliptic shape, which fits well with the shape of human mouth. Inside it is concave down,which is much easier for gas transmission.
South China University of Technology