Kirigami-Inspired Brain Implants Flex Like Never Before for Neural Recording

Scientists have created a flexible microelectrode array inspired by kirigami, the Japanese art of paper cutting. The device, designed for long-term, large-scale recordings of brain activity in primates, allows it to move naturally with the brain's surface.

The array's design mimics kirigami, giving it the ability to stretch and bend without losing electrical function. Unlike rigid probes, its spiral threads allow it to flex in three dimensions, matching the brain's shifting contours. This solves a key problem: the mismatch between stiff electrodes and soft, pulsating brain tissue.

To implant the device, researchers used a water-dissolvable carrier coated in hydrogel. This method allows quick, high-volume placement across wide areas of the brain's outer layer. Once in place, the threads float conformally, adapting to the brain's constant movements.

Testing in macaque monkeys showed impressive results. The array recorded signals from over 700 individual neurons at once, with high precision. These recordings were then used to decode upper-limb movements accurately, highlighting potential for brain-machine interfaces.

The kirigami-inspired array offers broad coverage and mechanical resilience, making it ideal for studying complex neural circuits. Its ability to move with the brain also improves prospects for long-term implants. Researchers see this as a step toward more reliable, large-scale brain recording technologies.