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A practical ultrasonic plethysmograph

V C Wu, W T Nickell, P K Bhagat

Aviation, Space, and Environmental Medicine

|April 1, 1982

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A new ultrasonic plethysmograph accurately measures human limb volume changes using acoustic pulse transit times. This advanced device offers improved performance and self-calibration capabilities over traditional methods.

Area of Science:

Biomedical Engineering
Medical Instrumentation
Physiology

Background:

Standard Whitney Strain Gauge plethysmographs have limitations in performance.
Accurate monitoring of human limb dimension changes is crucial for various medical applications.

Purpose of the Study:

To describe a novel ultrasonic plethysmograph with enhanced performance.
To introduce a method for monitoring limb dimension changes using acoustic pulse transit times.

Main Methods:

The instrument measures acoustic pulse transit times across two chords of the limb.
A microprocessor performs calculations, control functions, and self-calibration.
The system allows for correction of non-uniform limb expansion.

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Main Results:

Percentage change in limb volume is proportional to twice the percentage change in measured chords for uniform expansion.
Measurement of two chords enables correction for non-uniform expansion.
The instrument can estimate the absolute cross-sectional area of the limb.

Conclusions:

The developed ultrasonic plethysmograph offers improved performance and accuracy.
The microprocessor integration allows for self-calibration and easy reprogramming.
This technology provides a more advanced tool for monitoring limb volume dynamics.