| 摘要 |
This invention relates to sensors for Capnometry or Capnography applications wherein measurement is made on the mainstream of the patients breathing tube gases. Provision is made for sampling the respired gases and periodically stopping them off from the sensing mechanism while introducing instead, gases of known concentrations into the sensing cell for calibrating purposes. Several methods are described for activating the valving mechanism included in the miniature sensor. In principle this invention overcomes the time delay and complexity inherent in side-stream Capnometry/Capnography where rapid, up-to-date readings of CO2 concentration in the patients air stream are delayed due to the length of the sampling tube to the measuring instrument by reversing the process and carrying calibration gases which need not change rapidly to the main-stream sensor where they can be periodically sampled and thus not impairing the higher speed response possible with main-stream sensing systems.
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