G - Physics – 01 – N
Patent
G - Physics
01
N
354/28, 354/30,
G01N 21/35 (2006.01) A61B 5/08 (2006.01) G01N 21/31 (2006.01)
Patent
CA 1333849
An improved gas analyzer system and method for detecting and displaying the constituent gases of a respiratory gas stream, with the system compris- ing an optical bench further comprising a gas pathway for the flow of a gas stream through the optical bench, a flow shaping inlet at the gas entrance to the optical bench's gas pathway, three infrared detec- tion channel assemblies for measuring the partial pressures of constituent gases in the gas stream, means for measuring sensitivity changes in the detectors of the three infrared detection channel assemblies, a pressure sensor for measuring the pressure within the gas pathway, a temperature sensor for measuring the temperature within the optical bench, and a flow rate sensor for measuring the gas flow rate through the gas pathway, circuitry for processing the detected partial gas pressures, detector sensitivity changes, the measured values for pressure, temperature and flow rate, and for providing output signals indicative of processed measured values, the detected partial gas pressures, detector sensitivity changes and characterization information with respect to the optical bench components; analog input circuitry for processing the signals output from the optical bench for input to the analog processing circuitry; analog processing circuitry for processing the input signals and cor- recting at least the detected partial gas pressure signals for collision broadening, temperature, barometric pressure, cross correction, changes in detector sensitivity and characterization of the optical bench components, and providing output signals indicative of the corrected partial gas pressures to the display processing circuitry; display processing circuitry for processing the input signals for display of at least the corrected partial gas pressures on a cathode ray tube as numerical and scrolling graphical data, for output to analog and digital output connections, and for alarms; and a power supply for powering the system.
549452
Braig James R.
Corenman James E.
Goldberger Daniel S.
Rojas Emil P.
Stone James H.
Gowling Lafleur Henderson Llp
Nellcor Inc.
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