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Related Experiment Video

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Dry Electrodes for Surface Electromyography Based on Architectured Titanium Thin Films.

Marco S Rodrigues1, Patrique Fiedler2,3, Nora Küchler2

  • 1Centro de Física, Universidade do Minho, Campus de Gualtar, 4710-057 Braga, Portugal.

Materials (Basel, Switzerland)
|May 9, 2020
PubMed
Summary
This summary is machine-generated.

New dry electrodes using architectured titanium films offer a reusable alternative to traditional silver/silver chloride (Ag/AgCl) electrodes for surface electromyography (sEMG). These dry electrodes improve signal quality and eliminate the need for conductive gels, enhancing user comfort and convenience.

Keywords:
biopotential electrodesdry electrodeselectromyographyglancing angle depositionmagnetron sputteringthin films

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Area of Science:

  • Biomedical Engineering
  • Materials Science
  • Surface Science

Background:

  • Clinical surface electromyography (sEMG) relies on silver/silver chloride (Ag/AgCl) electrodes requiring conductive gel.
  • Conductive gels in sEMG limit long-term use due to drying, skin irritation, and prevent immediate electrode reuse.
  • Dry electrodes offer a potential solution to overcome the limitations of traditional gel-based electrodes.

Purpose of the Study:

  • To develop and evaluate novel dry electrodes for sEMG recordings using architectured titanium (Ti) thin films.
  • To investigate the influence of Ti thin film microstructures, specifically zigzags, on electrode performance.
  • To assess the reusability and signal quality of these dry electrodes compared to conventional Ag/AgCl electrodes.

Main Methods:

  • Fabrication of Ti thin films with zigzag microstructures via sputtering at varying incidence angles (α) on thermoplastic polyurethane (TPU) and stainless-steel (SS) substrates.
  • Characterization of electrode-skin impedance and recording of electromyography (EMG) signals in male athlete volunteers.
  • Comparison of signal quality parameters and signal-to-noise ratios (SNR) with reference Ag/AgCl electrodes.

Main Results:

  • Both SS and TPU-based dry electrodes demonstrated capability for sEMG recordings.
  • SS electrodes achieved signal quality comparable to Ag/AgCl reference electrodes.
  • TPU-based electrodes showed potential but require further optimization for performance enhancement.
  • Increased SNR was observed with the evolution of Ti thin film microstructure towards zigzag patterns.
  • Developed dry electrodes are reusable for multiple EMG recordings.

Conclusions:

  • Architectured Ti thin films, particularly with zigzag microstructures, are promising for developing high-performance dry sEMG electrodes.
  • Dry electrodes eliminate the need for conductive gels, offering a more comfortable and convenient solution for long-term sEMG monitoring.
  • Further microstructural tailoring of Ti thin films can optimize dry electrode performance for advanced biomedical applications.