Figure 4: Ultra-flexible MEA device and ECG measurement performed using the adhesive gel.
From: A strain-absorbing design for tissue–machine interfaces using a tunable adhesive gel
(a) Photograph of a conventional device consisting of an array of Au electrodes placed on a rat heart obtained immediately after contact and after 40 s, (scale bar, 1 cm). (b) Photograph of a device consisting of an array of 5 wt% PVA gel-coated Au electrodes placed on a rat heart after contact and 30 min later. Representative voltage signal obtained from the left ventricle for 0.5 s using the Au electrodes (c) and adhesive gel-coated Au electrodes (d), respectively. Representative voltage data from the left ventricle for 10 s using the Au electrodes (e) and PVA gel-coated Au electrodes (f), respectively. (g) Photograph showing that the device (4 × 4 MEA) was in conformal contact with the entire front hemisphere of the rat heart. The distances between the electrodes are 4 mm (lateral) and 3.3 mm (vertical) (scale bar, 4 mm). (h) Simultaneous voltage mapping of a cardiac wave. The signal starts from the right atrium to the outer area.
