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Related Experiment Video

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Monitoring Lung Function with Electrical Impedance Tomography in the Intensive Care Unit

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Portable Breathing Monitoring With Phase-Resolved Airflow Dynamics Enabled by a Dual-Response Flexible PZT Sensor.

Minyu Li¹, Jun Aoyama¹, Yuchao Wu¹

¹Department of Complex Systems Science, Graduate School of Informatics, Nagoya University, Nagoya, Japan.

Advanced Healthcare Materials

|May 28, 2026

Summary

This study introduces a portable breathing monitor using a flexible sensor. The device captures breathing dynamics, revealing distinct patterns in patients with chronic obstructive pulmonary disease or asthma for better health assessment.

Keywords:

Respiratory monitoring flexible PZT sensor intra‐cycle analysis phase‐resolved breathing dynamics piezoelectric–pyroelectric coupling portable healthcare devices

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Area of Science:

Biomedical Engineering
Respiratory Physiology
Wearable Technology

Background:

Assessing respiratory health in daily life is crucial but challenging due to breathing's dynamic nature.
Existing methods struggle to extract clear physiological data from breathing signals under natural conditions.

Purpose of the Study:

To develop a portable breathing monitoring device capable of extracting interpretable physiological information from natural breathing.
To enable phase-resolved quantification of breathing effort distribution.

Main Methods:

Development of a portable breathing monitor utilizing a flexible lead zirconate titanate sensor.
Exploitation of polarity-opposed piezoelectric and pyroelectric responses via sensor orientation.
Analysis of breathing waveform structure and phase-specific dynamics.

Main Results:

The sensor generates a dual-component breathing waveform (transient spike and quasi-steady peak).
This structure allows quantification of breathing effort distribution between components.
Pilot studies showed phase-specific breathing dynamic redistribution in patients with chronic obstructive pulmonary disease or asthma.

Conclusions:

The dual-response sensing approach provides robust access to function-related changes during natural breathing.
This technology offers a more stable and physiologically meaningful method for respiratory monitoring.
Potential for improved health assessment in daily-life settings, especially for respiratory conditions.