On-airway respiratory gas monitor employing transformed infrared

Surgery – Respiratory method or device – Means for supplying respiratory gas under positive pressure

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12820423, A61M 1600

Patent

active

059311614

ABSTRACT:
The respiratory gas analyzer (10), in one embodiment, is used for in-stream analysis of a patient breathing circuit (12). The analyzer includes a source (12) of infrared illumination, a modulator (28) for modulating the infrared illumination on a wavelength dependent basis to yield a modulated signal, a transmitter/detector unit (32) for transmitting the modulated signal through the breathing circuit (12) and detecting the transmitted signal, and a processing unit (34) for determining composition information regarding a sample under analysis based on the detected, modulated signal. The modulator (28) may include, for example, a Michelson interferometer for transforming the illumination into a frequency domain signal. The modulated signal allows for use of a compact detector system at the respiratory circuit interface. In addition, infrared fiber optics can be utilized to minimize instrumentation/optics at the interface.

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Amorphous Materials, Inc., Chalcogenide Glass Infrared Fibers For Application in the 2-11.mu.m Wavelength Range.

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