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Related Experiment Videos

Totally implantable directional Doppler flowmeters.

H V Allen, J W Knutti, J D Meindl

    Biotelemetry and Patient Monitoring
    |January 1, 1979
    PubMed
    Summary

    Two novel implantable Doppler blood flowmeters enable chronic, deep-body flow measurement. These small, low-power devices offer researchers alternatives to percutaneous leads for long-term physiological monitoring.

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    Area of Science:

    • Biomedical Engineering
    • Physiological Monitoring
    • Implantable Devices

    Background:

    • Chronic measurement of deep-body blood flow is crucial for physiological research.
    • Existing methods often involve invasive procedures or percutaneous leads, limiting long-term studies.
    • Need for reliable, minimally invasive technologies for continuous hemodynamic monitoring.

    Purpose of the Study:

    • To develop and characterize two totally implantable Doppler blood flowmeters.
    • To provide researchers with advanced tools for long-term deep-body flow measurement.
    • To offer alternatives to traditional methods, reducing animal restraint and infection risk.

    Main Methods:

    • Development of two custom-integrated circuit-based Doppler flowmeters: continuous-wave (CW) and pulsed.
    • Characterization of device size (<2.5 cm³), power consumption (<30 mW), and baseline stability.
    • Application-specific use cases: pulsed Doppler for velocity profiles and CW Doppler with RF telemetry for range-based velocity estimation.

    Main Results:

    • Both CW and pulsed Doppler flowmeters demonstrated small size, low power usage, and excellent baseline stability.
    • The CW Doppler system allows for long-range (≥3m) RF telemetry with a single velocity estimate.
    • The pulsed Doppler system is suitable for velocity-profile data and nonencircling transducers.

    Conclusions:

    • The developed implantable Doppler flowmeters provide viable, long-term solutions for deep-body blood flow measurement.
    • These devices offer significant advantages over traditional methods, including reduced invasiveness and enhanced data acquisition capabilities.
    • The complementary nature of the two instruments expands options for researchers in hemodynamic monitoring.

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