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A Microsystem to Measure Respiratory and Anaesthetic Gases During Surgery

  • G. Jibelian
  • G. Yates
  • B. Taylor
Conference paper

Abstract

Estimation of the concentration of light and volatile anaesthetic gases in the operating arena is usually achieved either with a series of discrete analysers or with a specially designed time-shared mass spectrometer. The cost and maintenance of either system, as well as the bulk of instrumentation and the time-consuming calibration of each device, have been deterrents to their widespread use. A low-cost system, simpler to calibrate, to operate and to maintain has been designed. It operates on the principle of chromatography but without the usual slow responsetime, and the dependency on technical skill. The overall system incorporates two separate microanalysers: one dedicated to the analysis of volatile anaesthetics, the other to permanent gases. Unlike commercially available chromatographs, this system allows analysis of physiological levels of carbon dioxide in the presence of large concentrations of nitrous oxide. Total analysis time for all gases is within 60 s, and the sample volume is less than 0.25 ml. The analysers are designed to be microcomputer compatible, and a built-in autozeroing circuit ensures a virtually drift-free baseline. Once calibrated prior to use, no periodic calibration is required throughout the duration of a case. Because of their microdimensions, the gas analyzers with their inherent power supplies can be housed in a utility drawer found in any conventional anaesthesia cart, making the overall system unobtrusive during routine use.

Keywords

Nitrous Oxide Detector Response Periodic Calibration Total Analysis Time Strip Chart Recorder 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

References

  1. 1.
    Harry LV, Beckham LM (1964) Determination of volatile organic anesthetics in blood. In: Szymanski HA (ed) Biomedical applications of gas chromatography, 2nd edn. Plenum, New York, p 307Google Scholar
  2. 2.
    Adlard ER, Hill DW (1960) Analysis of anesthetic mixtures by gas chromatography. Nature 186:1045PubMedCrossRefGoogle Scholar
  3. 3.
    Dressier DP, Mastio GJ, Allbritten FF (1960) Clinical application of gas chromatography to analysis of respiratory gases. J Lab Clin Med 55:144Google Scholar
  4. 4.
    Dyfrerman A, Sjovall J (1962) Estimation of fluothane by gas chromatography. Acta Anesthesiol Scand 6:171CrossRefGoogle Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 1986

Authors and Affiliations

  • G. Jibelian
  • G. Yates
  • B. Taylor

There are no affiliations available

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