Patent ID: 7762253

Claim:
A multiple lumen cannula assembly for delivery of multiple medical gasses to a patient, the multiple lumen cannula assembly comprising: a first lumen of a first cross-sectional area for the delivery of a first medical gas, the first lumen having a plurality of flow passages separated by a plurality of ridges; a second lumen of a second cross-sectional area disposed within the first lumen for the delivery of a second medical gas, wherein the first cross-sectional area is larger than the second cross-sectional area; a connection assembly comprising a first portion for providing the first medical gas to the plurality of flow passages of the first lumen and a second portion for providing the second medical gas to the second lumen; a mixing chamber located proximal to the patient and configured to receive the first medical gas from the first lumen and the second medical gas from the second lumen, wherein the mixing chamber combines the first and second medical gasses prior to delivery to the patient; and a patient triggering device disposed in the mixing chamber for detecting a patient breathing attempt; and a kink resistive means disposed between the plurality of flow passages of the first lumen, thereby providing structural support to the multiple lumen cannula, wherein the first lumen is defined between a first lumen wall and a second lumen wall and second lumen is defined by the second lumen wall and the kink resistive means comprises the plurality of ridges disposed between the plurality of flow passages within the first lumen, wherein each of the plurality of ridges extends from the first lumen wall defining the first lumen and contacts the second lumen wall defining the second lumen.