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Updated: Aug 27, 2025
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Breath Collection from Children for Disease Biomarker Discovery
Published on: February 14, 2019
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Towards breath sensors that are self-powered by design
Lucy Fitzgerald1, Luis Lopez Ruiz2, Joe Zhu1
1Mechanical and Aerospace Engineering, University of Virginia, Charlottesville, VA, USA.
Royal Society Open Science
|September 23, 2022
Summary
This study introduces a new self-powered by design (SPD) flow sensor for implantable medical devices. It uses piezoelectric materials in human airways for efficient, sub-resonant energy harvesting and broadband flow detection.
Area of Science:
- Biomedical Engineering
- Materials Science
- Fluid Dynamics
Background:
- Piezoelectric materials convert mechanical stress to electrical energy, ideal for small-scale sensing in implantable devices.
- Current self-powered by design (SPD) flow sensors often rely on empirical, turbulence-driven resonance methods.
- There is a need for model-based, efficient SPD sensing solutions for medical applications.
Purpose of the Study:
- To explore sub-resonant self-powered by design (SPD) flow sensing in human airways using piezoelectric materials.
- To develop and validate a physical model for piezoelectric sensing and energy harvesting in airway environments.
- To theorize a novel SPD sensing method capable of detecting broadband flow information.
Main Methods:
- Developed a physical model simulating piezoelectric sensing and energy harvesting within a human airway.
- Validated the physical model through a series of benchtop experiments.
- Utilized the validated model to investigate sub-resonant operation and broadband flow detection.
Main Results:
- The physical model accurately represents piezoelectric sensing and energy harvesting in airway conditions.
- Demonstrated the feasibility of sub-resonant SPD flow sensing in a simulated human airway.
- The model provides a roadmap for developing implantable SPD sensing solutions.
Conclusions:
- A model-based approach enables efficient, sub-resonant SPD flow sensing in human airways.
- This research paves the way for novel, self-powered implantable medical devices.
- The developed model can inform the design of future SPD sensors for diverse flow-sensing applications.
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