Wireless electrocortigraph (ECoG) recording system

We describe the design and development of a wireless recording system for short-term cortical EEG (ECoG) monitoring. This device is based on a novel manufacturing process that allows the synthesis of the electrode array and encapsulation of the integrated electronics at low cost. The electrodes and interconnections are created by depositing polymers doped with electrically conductive particles and interposing these conductive traces between insulating layers of nonconductive polymers. Signals from the electrodes are routed to a subcutaneous component of the implant where they are amplified and digitized. The implant is inductively powered by an external transceiver, and data from the implant are transmitted to the transceiver via transcutaneous infrared. This fully-implantable subdural grid has the potential reduce the rates of infection and other complications associated with cortical EEG monitoring procedures.