Spring-Like Kirigami Microelectrode Array in Shape Memory Polymer for Spontaneous Adaptation of Complex Topography in Neural Implants

This study presents a novel fabrication technology for shape memory polymer based kirigami electrodes designed for surface-mounted neural implants. The 3D kirigami structures enable dynamic height adjustments to adaptively conform to uneven topographies, effectively filling gaps up to 500 μm. Experimental results demonstrate significant improvements in signal quality compared to conventional 2D electrodes, with enhanced current uniformity after shape recovery. The spontaneous adaptability of these electrodes eliminates the need for local programming, making them suitable for diverse applications in neural interfaces and contributing to improved long-term stability and functionality in biomedical devices.