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Related Experiment Videos

A fiber optic PCO2 sensor.

G G Vurek, P J Feustel, J W Severinghaus

    Annals of Biomedical Engineering
    |January 1, 1983
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces the Opticap, an optical probe for measuring partial pressure of carbon dioxide (PCO2). The device uses fiber optics and a phenol red solution, demonstrating reliable performance in animal tissue and arterial PCO2 sensing.

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    Area of Science:

    • Biomedical Engineering
    • Sensor Technology
    • Optical Physics

    Background:

    • Accurate measurement of partial pressure of carbon dioxide (PCO2) is critical in clinical settings.
    • Existing PCO2 sensors may have limitations in terms of invasiveness, drift, or response time.
    • Development of novel optical sensors offers potential for improved PCO2 monitoring.

    Purpose of the Study:

    • To describe the theory, construction, and performance of a novel catheter tip optical PCO2 probe.
    • To evaluate the Opticap sensor's efficacy for both tissue and arterial PCO2 measurements.
    • To assess the sensor's stability and longevity.

    Main Methods:

    • The Opticap probe utilizes plastic fiber optics with a silicone rubber tip containing a phenol red-KHCO3 solution.

    Related Experiment Videos

  • Changes in ambient PCO2 alter the solution's pH, affecting the optical transmittance of phenol red.
  • A dual-fiber system transmits light to the tip and the resulting optical signal to a receiver for electrical conversion.

    • Main Results:

    • The electrical signal generated by the Opticap probe showed a linear relationship with PCO2 in the range of 2.7 to 10.7 kPa.
    • The sensor was successfully tested as a tissue PCO2 sensor on the feline cerebral cortex and as an arterial PCO2 sensor.
    • Daily drift was measured at 0.6 kPa or less, with individual probes demonstrating usability for up to 12 weeks.

    Conclusions:

    • The Opticap catheter tip optical PCO2 probe is a viable technology for PCO2 monitoring.
    • The sensor exhibits good linearity, stability, and longevity, suitable for clinical applications.
    • This optical PCO2 sensor offers a promising alternative for both tissue and arterial PCO2 measurements.