All neural information systems (NIS) rely on sensing neural activity to supply commands\nand control signals for computers, machines and a variety of prosthetic devices. Invasive systems\nachieve a high signal-to-noise ratio (SNR) by eliminating the volume conduction problems caused\nby tissue and bone. An implantable brain machine interface (BMI) using intracortical electrodes\nprovides excellent detection of a broad range of frequency oscillatory activities through the placement\nof a sensor in direct contact with cortex. This paper introduces a compact-sized implantable wireless\n32-channel bidirectional brain machine interface (BBMI) to be used with freely-moving primates.\nThe system is designed to monitor brain sensorimotor rhythms and present current stimuli with a\nconfigurable duration, frequency and amplitude in real time to the brain based on the brain activity\nreport. The battery is charged via a novel ultrasonic wireless power delivery module developed\nfor efficient delivery of power into a deeply-implanted system. The system was successfully tested\nthrough bench tests and in vivo tests on a behaving primate to record the local field potential (LFP)\noscillation and stimulate the target area at the same time.
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