Medical breathing apparatus

A medical breathing apparatus, comprising:

• a generally U-shaped first member forming an upper surface spaced apart from a lower surface with left and right lateral interocclusal passageways formed therebetween, the left and right lateral interocclusal passageways extending from an anterior portion of the first member through a posterior portion of the first member, and a posterior central orifice extending through the anterior portion from a first cavity defined by a tubular portion extending anteriorly from the anterior portion of the first member;
• wherein the first member is shaped and configured to contact an upper dentition of a patient with the upper surface or a lower dentition of a patient with the lower surface;
• a second member attached to the anterior portion, the second member including an anterior central orifice extending through the second member and in communication with the posterior central orifice to form a central passageway extending through the first member and the second member;
• wherein the second member includes one or more anterior apertures in fluid communication with the left and right lateral interocclusal passageways;
• and
• an adapter slidably receivable within the first cavity of the tubular portion of the first member, wherein the adapter includes a central orifice configured to engage the second member as an extension of the central passageway, and a respiratory orifice configured to deliver respiratory gas to the left and right lateral interocclusal passageways.