A biodegradable and self-deployable electronic tent electrode for brain cortex interfacing

High-density, large-area electronic interfaces are a key component of brain–computer interface technologies. However, current designs typically require patients to undergo invasive procedures, which can lead to various complications. Here, we report a biodegradable and self-deployable tent electrode for brain cortex interfacing. The system can be integrated with multiplexing arrays and a wireless module for near-field communication and data transfer. It can be programmably packaged and self-deployed using a syringe for minimally invasive delivery through a small hole. Following delivery, it can expand to cover an area around 200 times its initial size. The electrode also naturally decomposes within the body after use, minimizing the impact of subsequent removal surgery. Through in vivo demonstrations, we show that our cortical-interfacing platform can be used to stimulate large populations of cortical activities. A biodegradable electronic tent electrode array that can be inserted into the brain cortex using a syringe, where it then expands to 200 times its original size, can be used for electrocorticography monitoring.