User interface for supplying gases to an airway

A user interface for providing a flow of respiratory gases to a user during a medical procedure comprising:

• a nasal interface comprising a body and a pair of prongs extending from the body, the prongs configured to engage nares of the user's nose and direct high flow respiratory gases into the nares;
• a mouthpiece adapted to engage the mouth of the user;
• wherein the prongs and/or the mouthpiece are configured to partially occlude either an oral airway, a nasal passage, or both the oral airway and the nasal passage in use;
• wherein each prong is independently inflatable to create a partial seal with the nares of the user;
• and
• wherein the prongs are configured to be inflatable to create a partial occlusion with the nares of the user during use while the nasal interface directs high flow respiratory gases into the nares, wherein the partial occlusion comprises a gap between an outer surface of each of the prongs and the nares of the user.