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Capacitive blood pressure transducer

J F Dias, H E Karrer, A Tykulsky

    ISA Transactions
    |January 1, 1980
    PubMed
    Summary
    This summary is machine-generated.

    A novel capacitive transducer using fused quartz was developed for accurate blood pressure measurement. This device offers high overpressure capacity and minimal thermal drift for reliable readings.

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    Area of Science:

    • Biomedical Engineering
    • Materials Science

    Background:

    • Accurate blood pressure monitoring is crucial in clinical settings.
    • Existing transducers may face limitations in temperature stability and sensitivity.

    Purpose of the Study:

    • To develop and characterize a new capacitive transducer for blood pressure measurement.
    • To utilize fused quartz for enhanced thermal stability.

    Main Methods:

    • Fabrication of a capacitive transducer with a fused quartz body and diaphragm.
    • Plasma etching for electrode cavity creation and vacuum deposition of electrodes.
    • Brazing the diaphragm and body using a tin-gold alloy.

    Main Results:

    • The transducer exhibits a full scale of 300 mm Hg with 3000 mm Hg overpressure capacity.

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  • Achieved low thermal sensitivity (0.015% FS/°C) and thermal zero drift (0.01% FS/°C).
  • Demonstrated linearity and hysteresis of 0.5% FS with a low volume displacement of 0.02 mm³/100 mm Hg.

    • Conclusions:

    • The fused quartz capacitive transducer offers a robust and stable solution for blood pressure measurement.
    • The design minimizes thermal effects and provides high accuracy for clinical applications.