A Stretchable-Hybrid Low-Power Monolithic ECG Patch with Microfluidic Liquid-Metal Interconnects and Stretchable Carbon-Black Nanocomposite Electrodes for Wearable Heart Monitoring

A coin-cell battery-powered 4.8 cm x 4.8 cm SEP with three key parts: Rigid chip on board, elastomer matrix with microfluidics, and softcarbon black nanocomposite electrodes.

A stretchable electrocardiogram (ECG) patch (SEP) that monolithically integrates ECG monitoring chip-on-board (COB) with polydimethylsiloxane (PDMS) and liquid-metal interconnects is presented. The 4.8 x 4.8 cm2 SEP is conformal and robust to mechanical deformation. The use of Silicon On-Insulator rigid complementary-metal-oxide-semiconductor chip allows sophisticated power management and signal processing. The chip’s dense inputs/output pads are interfaced with coarser liquid-metal interconnects using dual-sided COB design. Robust ECG signal response (=100 mVP–P up to 1 kHz), subjected to mechanical deformation and moisture is demonstrated. The SEP allows up to 10% stretch, providing sufficient pliability to enable conformal contact to the human chest. Low profile soft carbon black-PDMS nanocomposite electrodes, robust to deformation, enable good skin contact and allow for low-noise signal acquisition that is comparable to larger commercial wet electrodes.

Researcher / Author: Yida Li, Alireza Alian, Li Huang, Kah Wee Ang, Dennis Lin, Dan Mocuta, Nadine Collaert, and Aaron V-Y Thean
ADV. Electron, Master,  2018, 1800463; https://doi.org/10.1002/aelm.201800463.

For full publication paper, email: hifes@nus.edu.sg

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