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A bidirectional respiratory flowmeter using the hot-wire principle.

I Yoshiya, T Nakajima, I Nagai

Journal of Applied Physiology

|February 1, 1975

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A new bidirectional respiratory flowmeter uses a hot-wire sensor to accurately detect airflow direction. This device offers rapid switching times, minimizing artifacts for precise respiratory measurements.

Area of Science:

Biomedical Engineering
Respiratory Physiology

Background:

Accurate measurement of respiratory airflow is crucial for diagnosing and monitoring various respiratory conditions.
Existing flowmeters may have limitations in detecting rapid changes in airflow direction.

Purpose of the Study:

To develop and validate a novel bidirectional respiratory flowmeter utilizing the hot-wire principle.
To assess the performance and switching characteristics of the developed flowmeter.

Main Methods:

A bidirectional respiratory flowmeter was designed using a platinum hot-wire and two parallel tungsten wires.
A flow-direction sensor utilizing the temperature difference and resistance change between tungsten wires was implemented.
A differential amplifier was used to detect resistance differences and generate a flow inversion signal.

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Main Results:

The flowmeter demonstrated switching times of 3 ms during panting and 10 ms during quiet breathing at a specific sensor configuration.
Artifacts due to switching delay were found to be practically negligible.
The device is adaptable for various respiratory flow measurements, excluding applications with flammable gases.

Conclusions:

The developed hot-wire bidirectional respiratory flowmeter provides accurate and rapid detection of airflow direction.
The instrument's fast switching times and minimal artifacts make it suitable for precise respiratory monitoring.
This technology offers a versatile tool for respiratory research and clinical applications.