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[High linearity biologic impedancemeter (author's transl)]

O E Clavin, M E Valentinuzzi

    Acta Physiologica Latino Americana
    |January 1, 1977
    PubMed
    Summary
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    This study introduces a new high-linearity instrument for measuring biological impedance modulus and its variations. The device offers precise measurements for physiological monitoring, ensuring patient safety and reliable data collection.

    Area of Science:

    • Biomedical Engineering
    • Physiological Measurement

    Context:

    • Accurate impedance measurements are crucial for non-invasive physiological monitoring.
    • Existing instruments may lack the linearity, sensitivity, or safety features required for biological applications.

    Purpose:

    • To describe a novel, high-linearity instrument for measuring biological impedance modulus and its variations.
    • To detail the instrument's technical specifications, including linearity, sensitivity, and error margins.
    • To highlight the instrument's safety features and suitability for clinical and experimental use.

    Summary:

    • A high-linearity instrument for biological impedance modulus measurement (50-1,000 ohms) is presented.
    • It features two outputs (Z and delta Z) compatible with standard physiological recorders.

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  • Demonstrates high linearity (deviation <0.06%), sensitivity (100 mV/ohm), and low error (<1%), with stable performance under power supply fluctuations and robust isolation to prevent patient leakage currents.

    • Impact:

    • Enables more accurate and reliable non-invasive physiological monitoring.
    • Provides a safer alternative for biological impedance measurements, minimizing risks to patients.
    • Facilitates advanced research in areas such as respiratory and cardiac activity monitoring through precise impedance data.