Medical breathing apparatus

A medical mouthpiece, comprising:

• a generally U-shaped first member forming an upper channel spaced apart from a lower channel 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 first central orifice extending through the anterior portion;
• wherein the first member is shaped and configured to receive an upper dentition of a patient in the upper channel or a lower dentition of a patient in the lower channel;
• and
• a second member attached to the anterior portion, the second member including a second central orifice extending through the second member and in communication with the first central orifice to form a central passageway extending through the mouthpiece;
• wherein the second member includes a first port and a second port formed therein;
• the first port being fluidly connected to a left lateral interocclusal sampling port and a right lateral interocclusal sampling port for sampling expiration gases, the left and right lateral interocclusal sampling ports being disposed within the left and right inter-occlusal passageways, respectively, proximate the posterior portion;
• the second port being fluidly connected to the left and right lateral interocclusal passageways for delivery of a supplemental gas into the left and right lateral interocclusal passageways.