Patent ID: 7743770

Claim:
A cannula having at least three completely separate flow passages, the cannula comprising: a nasal main body having first and second main flow chambers respectively communicating with first and second ports, and the first and second main flow chambers being separated from one another by a nasal septum; a mouth main body located adjacent the nasal main body and having at least a third main flow chamber therein communicating with at least third port, and the third main flow chamber being completely separate from both the first and the second main flow chambers; a first nare having a first nasal port and a first nasal flow chamber communicating with the first main flow chamber; a second nare having a second nasal port and a second nasal flow chamber communicating with the second main flow chamber; a first mouthpiece having a first mouth port and a first mouthpiece flow chamber communicating with the third main flow chamber; and a first flow path comprises the first port, the first main flow chamber the first nasal flow chamber and the first nasal port; a second flow path comprises the second port, the second main flow chamber, the second nasal flow chamber and the second nasal port; and a third flow path comprises the third port, the third main flow chamber, the first mouthpiece flow chamber and the first mouth port.