3 research outputs found
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Inferring complex textile shape from an integrated carbon black-infused ecoflex-based bend and stretch sensor array
We demonstrate how an array of custom-made strain and bend sensors could be integrated into a stretchable sleeve to infer the textile deformation. The angles and elongation measured by the sensors can be used by an optimisation-based algorithm to infer the textile geometrical model by minimising a loss function. We evaluated this on 4 shapes highlighting different body-part characteristics. We demonstrated that a 3.11 mm reconstruction error on complex geometries can be reduced up to 0.08 mm with the computation of angles. This proves the potential of the proposed prototype for capturing the shape of a body parts, muscle density measurement, body shape acquisition, the fabrication of orthoses and prostheses, or to perform movement sensing for human activity recognition, where it could be included in sports leggings for biomechanical analysis, or in everyday garments for motion and gesture sensing
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Biocompatible gel-free coconut oil and carbon black electrodes for ECG and respiration measurements
The current state of the art in telemedicine has increased the interest in long-term monitoring of physiological and bioelectric signals. This motivated the development of materials and techniques for the fabrication of biocompatible, user, and environmentally friendly alternatives to conventional resistive wet electrodes. Here, we report a method for the fabrication of dry flexible and stretchable electrodes based on coconut oil (CNO) and carbon black (CB) for the monitoring of electrophysiological signals without conductive gels. The highly stretchable material shows a specific resistance ρ down to 33.2± 12.3 Ωm, high conformability, and a stretchability up to 1500%. The epidermal electrodes were used to record electrocardiographic (ECG) signals and measure respiration in a three-lead configuration and compared with commercial wet electrodes. Even after being elongated by 100% for 100 stretch/release cycles, a reliable recording of the QRS complex is demonstrated without the need for any contact enhancer or substances that cause skin reaction, demonstrating the potential use of this material for long-term ECG monitoring applications.</p