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Related Experiment Videos

A Doppler flowmeter for use in theatre.

J D Beard, J M Evans, R Skidmore

    Ultrasound in Medicine & Biology
    |November 1, 1986
    PubMed
    Summary
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    A new Doppler flowmeter offers improved accuracy for measuring blood velocity in arteries. This device minimizes errors from vessel variations and probe angle, providing reliable flow measurements for surgical applications.

    Area of Science:

    • Biomedical Engineering
    • Medical Devices
    • Fluid Dynamics

    Background:

    • Existing electromagnetic and ultrasonic flowmeters have limitations in accuracy and application.
    • Accurate measurement of blood flow is crucial in vascular surgery.

    Purpose of the Study:

    • To develop and validate a novel Doppler flowmeter for precise blood velocity measurement.
    • To overcome limitations of current flowmetry techniques in surgical settings.

    Main Methods:

    • Development of a Doppler flowmeter utilizing a 10 MHz pencil probe and mean frequency estimator.
    • Implementation of a plastic cuff to standardize probe angle and vessel constraint.
    • Use of a gauge for precise vessel wall thickness measurement.
    • Calibration for non-even insonation to calculate internal diameter and blood flow.

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    Main Results:

    • The flowmeter exhibits linear output from 1.3 to over 50 cm s-1 for pulsatile flow.
    • Accuracy and reproducibility were found to be less than 12% for vessels > 2 mm internal diameter on a hydraulic model.
    • Satisfactory signals were obtained from most prosthetic materials, except PTFE.

    Conclusions:

    • The developed Doppler flowmeter provides a reliable and accurate method for measuring blood flow during arterial reconstructive surgery.
    • The system's design minimizes common sources of error, enhancing clinical applicability.
    • Routine use in arterial surgery demonstrates its practical value and effectiveness.