Stretchable micro-doughnuts Kirigami bioprobe

We have developed a ‘doughnuts’-shaped stretchable microelectrode array device using a Kirigami structure. The Kirigami device shows the transformation from the two-dimensional (2D) doughnuts shape into the three-dimensional (3D) cylindrical shape. The cylindrical shaped stretchable film is suitable for the sphere or columnar shaped biological tissues with a high adhesion, enabling it to fix the electrodes to the wet biological tissues without slip. We fabricated the doughnuts shaped Kirigami electrode device, and demonstrated the in vivo electrocardiogram (ECG) recording from a beating mouse's heart. In addition to the wrapping feature, our Kirigami device with the small Young's modulus can minimize the device-induced physical stress to the heart, offering low invasive ECG recording compared to conventional elastomer based stretchable devices.