2019 · 29 citations · 8 references
EngineeringBiomedical EngineeringElectrical EngineeringAntennasNeural EngineeringWireless CommunicationsImplantable Biomedical DevicesImplantable MicrodevicesImplantable MicrosystemsImplantable Neural DevicesRadio-frequency Integrated CircuitsWireless Power TransferBackscatteringBi-directional Wireless Power TransferBrain-machine InterfacesElectrocorticographyElectrocorticography ImplantsImplantable Wireless Power TransferInductive CouplingWireless Power Transfer For Implants
To dramatically increase the scale and spatial resolution for future chronic electrocorticography (ECoG) applications, we propose a wireless brain-machine interface (BMI) system based on a high number (up to 1000) of freely distributed, sub-mm sized (0.25 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> ) IC implants. The chip features an onchip antenna for RF energy harvesting at 900 MHz and data backscattering at 10 Mbps. In order to synchronize and time-multiplex the uplink data transmission of the untethered chips, while allowing their oscillators to free-run to save power, a robust Mbps ASK-PWM downlink data protocol based on digital counters was implemented. To the best of our knowledge, this paper presents the first experimental validation of simultaneous wireless power transfer and bi-directional RF data communications on a network of (32) brain implant ICs over a single inductive coupling link.
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Neuronal ensemble control of prosthetic devices by a human with tetraplegia
Leigh R. Hochberg, Mijail D. Serruya, Gerhard M. Friehs et al. · Nature · 2006 · 3.3K citations