Patent ID: 7004168

Claim:
A face mask assembly, comprising: (a) a face mask sized and configured to fit over an oral region, a nasal region, or both of a user's face, the mask having a port; (b) a first conduit having a proximal end and a distal end, wherein the proximal end of the first conduit is coupled to the face mask through the port; (c) a gas sample cell defined in the first conduit; (d) a second conduit having a proximal end and a distal end, wherein the proximal end of the second conduit is coupled to the distal end of the first conduit such that the face mask, the first conduit, and the second conduit are supported on such a user during use of the face mask assembly, and wherein the distal end of the second conduit is open to ambient atmosphere, and wherein the second conduit includes a reservoir defined therein; and an oxygen port defined in a wall of the second conduit and adapted to communicate a source of oxygen with the reservoir.