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ReGrid: A Highly Conformable and Ultrasound Transparent Patch for HD-sEMG Detection
Summary
This study introduces ReGrid, a novel dry electrode grid for high-density electromyography (HD-sEMG). It is skin-conformable and ultrasound-transparent, enabling simultaneous HD-sEMG and ultrasound imaging without signal interference.
Area of Science:
- Biomedical Engineering
- Neuroscience
- Medical Imaging
Background:
- High-density electromyography (HD-sEMG) requires reliable electrode-skin contact.
- Integrating HD-sEMG with ultrasound imaging presents challenges due to probe and electrode interference.
Purpose of the Study:
- To develop and validate a novel dry electrode grid (ReGrid) for HD-sEMG that is highly conformable and ultrasound-transparent.
- To assess the feasibility of simultaneous HD-sEMG and ultrasound acquisition using ReGrid.
Main Methods:
- Fabrication of a thin-film polyurethane membrane with inkjet-printed silver electrodes and traces.
- Mechanical conformability and ultrasound transparency testing.
- In-vivo evaluation on tibialis anterior muscle, recording HD-sEMG signals with and without an ultrasound probe.
Main Results:
- ReGrid demonstrated excellent conformability to curved surfaces and complete ultrasound transparency without artifacts.
- Low and stable electrode-skin impedance with noise levels comparable to gel-based electrodes.
- Simultaneous HD-sEMG and ultrasound acquisition showed no significant impact on signal quality, conduction velocity, or decomposition outcomes.
Conclusions:
- ReGrid is a viable technology for combined HD-sEMG and ultrasound applications.
- The electrode's properties enable novel integrated imaging and electrophysiological assessments.
- This facilitates advanced research in areas like 3D and panoramic ultrasound integrated with HD-sEMG.
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