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Related Experiment Video

Updated: Feb 27, 2026

Conformable Wearable Electrodes: From Fabrication to Electrophysiological Assessment
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Passive Wearable Skin Patch Sensor Measures Limb Hemodynamics Based on Electromagnetic Resonance.

Kim Cluff, Ryan Becker, Balakumar Jayakumar

    IEEE Transactions on Bio-Medical Engineering
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    This study developed a passive electromagnetic resonant skin patch sensor capable of measuring pulsatile blood flow and hemodynamic waveform features. The sensor accurately detects heart rate and may enable wireless cardiovascular health monitoring.

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    Area of Science:

    • Biomedical Engineering
    • Cardiovascular Monitoring
    • Sensor Technology

    Background:

    • Developing non-invasive methods for monitoring limb hemodynamics is crucial for cardiovascular health assessment.
    • Existing technologies may be limited by invasiveness, power requirements, or bulkiness.

    Purpose of the Study:

    • Design and develop an open-circuit electromagnetic resonant skin patch sensor.
    • Characterize the relationship between fluid volume and resonant frequency.
    • Evaluate the sensor's capability in measuring limb hemodynamics and pulse volume waveform features.

    Main Methods:

    • An open-circuit electromagnetic resonant sensor with a planar spiral copper trace was designed.
    • The sensor's self-resonating response was excited by a radio frequency sweep.
    • Performance was evaluated using a human arm phantom with a vascular network.

    Main Results:

    • The sensor detected pulsatile blood flow via resonant frequency shifts.
    • Waveform patterns (systolic upstroke, peak, dicrotic notch, diastolic downstroke) were observed.
    • Resonant sensor peak systolic time strongly correlated with ultrasound pulse wave Doppler measurements.

    Conclusions:

    • The sensor accurately detects pulsatile flow and hemodynamic waveform features.
    • Heart rate was measured with 98% accuracy.
    • The passive, wireless sensor shows potential for monitoring cardiovascular health.