The invention relates to a high-flow nasal cannula allowing an increased supply of oxygen flow compared to nasal cannulas that already exist on the market. To this end, the nasal cannula has a connection to an oxygen supply source from which a conduit extends, said conduit branching into two outflow conduits for supplying the nasal cannula, where the diameter of the outflow conduits leading from the branching point to the nasal cannula is such that it allows the guidance of the maximum flow supplied by the source. To this end, in one possible embodiment, the diameter of the supply tubes is at least equal to the diameter of the tube connecting to the source.
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