#$%^&*AU2019100778A420190815.pdf#####Abstract The invention discloses a medical oxygen cannula, comprising a body, a transition tube and two nasal prongs, wherein the body is connected with the transition tube, the transition tube is connected with the two nasal prongs in the 5 radial direction, and the inner walls at the joints where the nasal prongs meet the transition tube have a smooth transition arc structure. The invention improves the structure of the inner walls at the joints where the transition tube meets the nasal prongs to prevent turbulence of airflow and reduce noise； in addition, the invention enlarges the interior diameter of the transition tube and 0 that of the nasal prongs to reduce the flow rate of pressurized gas, which further prevents the noise caused by the flow of pressurized gas. Moreover, the transition tube is provided with breathable filler inside, which also helps to reduce airflow velocity.2 3 Figure 1 1/2
