Patent ID: 8197417

Claim:
A unitary lightweight analyzer comprising, in combination: (a) a housing having a tubular socket with a central lumen; (b) an oxygen sensor mounted to the housing and exposed to the lumen for producing a first electrical signal proportional to inspired and expired oxygen; (c) a diatomic gas sensor contained in the housing including an arcuate, open channel having a concave wall with a reflective surface thereon and first and second ends, the first end aligned with an IR source and the second end aligned with an IR detector for producing a second electrical signal proportional to the concentration of a predetermined gas in inspired and expired respiratory air flowing through the transducer; (d) a flow sensor exposed to respiratory gas flow in the lumen for producing a third electrical signal proportional to the respiratory gas flow, the oxygen sensor, diatomic gas sensor and the flow sensor aligned with a mainstream respiratory gas flow path through the lumen; (e) an analog-to-digital converter connected to receive the first, second and third electrical signals; and (f) a microcontroller circuit coupled to the analog-to-digital converter, said oxygen sensor, diatomic gas sensor, flow sensors, analog-to-digital converter and microcontroller circuit being contained in a housing of a size and weight is adapted to be supported on the face of a subject whose oxygen uptake and carbon dioxide production are to be measured.