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An inexpensive pressure telemetry system

B J Barber, E W Quillen, A W Cowley

    The American Journal of Physiology
    |October 11, 1980
    PubMed
    Summary
    This summary is machine-generated.

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    This study details an affordable, wireless telemetry system for monitoring animal blood pressure using common equipment. The system offers reliable, distortion-free data transmission for extended periods.

    Area of Science:

    • Biomedical Engineering
    • Physiological Monitoring
    • Animal Research

    Background:

    • Accurate physiological monitoring is crucial in animal research.
    • Existing telemetry systems can be expensive and complex.
    • Need for cost-effective and reliable remote data acquisition.

    Purpose of the Study:

    • To develop an inexpensive telemetry system for measuring arterial pressure in animals.
    • To utilize readily available transducers and recorders.
    • To ensure accurate and stable long-term data transmission.

    Main Methods:

    • A Statham transducer's DC signal was frequency-encoded using a voltage-controlled oscillator.
    • The signal frequency modulated a Colpitts oscillator for radio-frequency transmission (88-108 MHz).

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  • A portable system (0.5 kg) with a NiCd battery pack was developed for canine use.

    • Main Results:

    • The system transmitted signals up to 250 ft for 50 hours on a single charge.
    • A modified automotive receiver and Grass 7B recorder decoded the signal accurately.
    • No distortion was observed compared to direct measurements; drift-free for over 24 hours.

    Conclusions:

    • The developed telemetry system is a cost-effective solution for wireless physiological monitoring.
    • It provides accurate, reliable, and stable arterial pressure measurements in freely moving animals.
    • This technology can significantly benefit animal research by enabling less invasive, long-term studies.