Patent ID: 8770199

Claim:
A nasal cannula for therapeutic gas delivered to a patient in need thereof, comprising: a first lumen, a second lumen, and a third lumen: the first lumen being a first therapeutic gas lumen for delivering a first therapeutic gas to a patient in need thereof, the second lumen being a triggering lumen, and the third lumen being a second therapeutic gas lumen for delivering a second therapeutic gas to the patient; a cannula nosepiece aggregating, and allowing separate flow paths to the patient for, each of (i) the first therapeutic gas lumen, (ii) the triggering lumen, and (iii) the second therapeutic gas lumen; and wherein the first lumen has an inner diameter that is smaller than an inner diameters of the second lumen and third lumen but larger than an inner diameter of the flow path for the first lumen at the cannula nosepiece.