Non-Rebreather Mask with Nasal Cannula
A patient respiratory mask includes a face mask that in use defines an enclosed space, an oxygen reservoir bag in fluid communication with the enclosed space via a one-way intake valve, an out-flow port positioned on the face mask allowing for the exhaust of expired air. A source of oxygen is in fluid communication with the reservoir bag via an oxygen delivery tube, and a nasal cannula is positioned within the enclosed space and is connected to the source of oxygen by a nasal cannula delivery tube that is in fluid communication with the oxygen delivery tube. An in-line flow restrictor is positioned in the nasal cannula delivery tube and allows high-flow oxygen into the reservoir bag, while at the same time limiting oxygen flow into the nasal cannula.
1 . A patient respiratory mask comprising:
a face mask that in use defines an enclosed space between an inner surface of the face mask and the face of a patient;
an oxygen reservoir bag in fluid communication with the enclosed space via a one-way intake valve, the one-way intake valve allowing flow from the reservoir bag into the enclosed space but preventing the entry of expired air into the reservoir bag;
an out-flow port positioned on the face mask allowing for the exhaust of expired air;
a source of oxygen in fluid communication with the reservoir bag via an oxygen delivery tube;
a nasal cannula sized for high-flow oxygen delivery positioned within the enclosed space defined by the face mask, the nasal cannula being connected to the source of oxygen by a nasal cannula delivery tube that is in fluid communication with the oxygen delivery tube; and
an in-line flow restrictor positioned in the nasal cannula delivery tube that limits oxygen flow into the nasal cannula, while at the same time allowing a higher flow of oxygen into the reservoir bag.
2 . The patient respiratory mask of claim 1 , wherein the out-flow port includes a one-way valve to provide the effective near 100% FiO 2 of a non-rebreather mask by preventing inspiration of room air.
3 . The patient respiratory mask of claim 1 , wherein there is an in-line pop-off valve in the oxygen delivery tube, positioned between the source of oxygen and the connection of the nasal cannula delivery tube with the oxygen delivery tube, to prevent overpressure of the system.
4 . The patient respiratory mask of claim 1 , further comprising a sampling port in the face mask that allows for capnography of expired air.
5 . The patient respiratory mask of claim 1 , wherein the nasal cannula is formed integrally with the face mask.
6 . The patient respiratory mask of claim 1 , wherein the flow restrictor allows the flow of oxygen into the nasal cannula at a rate of about 8 to 15 l/min, while at the same time allowing oxygen flow into the reservoir bag at a flow rate of about 15-25 l/min.
7 . A method of administering high-flow oxygen therapy to a patient utilizing the respiratory mask of claim 1 .