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Non-contact electrocardiogram measuring method based on capacitance coupling electrodes with ultra-high input

Jiangtao Li1, Yifeng Wang1, Chenjie Li1

  • 1School of Electrical Engineering, Xi'an Jiaotong University, Xi'an 710049, China.

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New non-contact electrocardiogram (ECG) monitoring uses printed circuit board (PCB) electrodes for improved safety and comfort in remote cardiac healthcare. This wearable technology effectively captures essential ECG signals and heart rhythms during various activities.

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Area of Science:

  • Biomedical Engineering
  • Wearable Technology
  • Cardiovascular Monitoring

Background:

  • Remote cardiac healthcare demands advanced wearable electrocardiogram (ECG) monitoring solutions.
  • Conventional Ag/AgCl electrodes present limitations in safety, convenience, and comfort for long-term wearable monitoring.
  • No-contact ECG measurement methods offer significant advantages for wearable applications.

Purpose of the Study:

  • To develop and evaluate a novel non-contact ECG measurement system using capacitance coupling printed circuit board (PCB) electrodes.
  • To assess the performance characteristics of the proposed non-contact ECG system.
  • To validate the accuracy and effectiveness of the PCB electrode system against traditional methods.

Main Methods:

  • Designed and fabricated a capacitance coupling PCB electrode with ultra-high input impedance for non-contact ECG measurement.
  • Developed an eight-channel ECG signal processing circuit.
  • Experimentally measured key performance properties including input impedance, phase-frequency and amplitude-frequency characteristics, coupling coefficient, and input short-circuit noise. Conducted synchronous comparisons with Ag/AgCl electrodes and studied the influence of lead positions, coupling medium, and body motion.

Main Results:

  • The proposed non-contact ECG system effectively collected the main components of ECG signals and cardiac rhythm.
  • Experimental measurements confirmed the performance properties of the capacitance coupling PCB electrode system.
  • Synchronous comparisons demonstrated the accuracy of the non-contact method compared to Ag/AgCl electrodes across various conditions, including body motion.

Conclusions:

  • Capacitance coupling PCB electrodes provide a viable and effective solution for non-contact ECG monitoring.
  • The developed system is suitable for wearable, long-term ECG monitoring in remote healthcare settings.
  • The non-contact method demonstrates robustness and accuracy in capturing cardiac signals under diverse physiological and motion states.