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High-resolution portable bluetooth module for ECG and EMG acquisition.

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Summary

This study introduces a flexible, modular biosignal acquisition system for telemedicine, offering high-fidelity, power-efficient wireless data transmission and validated signal integrity for improved portable biosensing applications.

Keywords:
Acquisition integrityElectrocardiogramElectromyogramHuman-centredPrinted circuit boardTelemedicineWearable

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Area of Science:

  • Biomedical Engineering
  • Telemedicine Technology
  • Wearable Biosensors

Background:

  • Existing portable electrocardiogram (ECG) and surface electromyography (sEMG) systems for telemedicine often have limited flexibility and inefficient wireless data handling.
  • There is a need for adaptable and robust biosignal acquisition systems for remote patient monitoring.

Purpose of the Study:

  • To develop a modular biosignal acquisition system that addresses the limitations of current portable telemedicine devices.
  • To enhance application flexibility, signal validation, and wireless data transmission efficiency.

Main Methods:

  • A modular 8-channel biosignal acquisition system with 24-bit resolution and configurable sampling rates (1-4 kHz).
  • Features include per-channel gain/source adjustments, internal MUX-based reference drive, and visual electrode integrity monitoring.
  • Bluetooth® wireless transmission utilizes a compact bit-wise packet structure for improved efficiency.

Main Results:

  • Achieved low input-referred noise (max 6.7 μVrms) and excellent signal fidelity (harmonic correlations >99.99%, THD -53.03 dBc, pulse wave correlation >99.68%).
  • Demonstrated efficient data transmission (83.92% smaller than JSON, 7.28x faster decoding).
  • Provided extended operational time (22.3 hours on a 3.3 Ah battery at 150 mA).

Conclusions:

  • The developed system enables high-fidelity and power-efficient biosignal acquisition.
  • Validated signal integrity and adaptable multi-channel capabilities address critical gaps in portable biosensing for telemedicine.
  • The system offers a flexible and efficient solution for remote health monitoring.