A Fully-Implantable Wireless System for Human Brain-Machine Interfaces Using Brain Surface Electrodes: W-HERBS

Masayuki HIRATA  Kojiro MATSUSHITA  Takafumi SUZUKI  Takeshi YOSHIDA  Fumihiro SATO  Shayne MORRIS  Takufumi YANAGISAWA  Tetsu GOTO  Mitsuo KAWATO  Toshiki YOSHIMINE  

IEICE TRANSACTIONS on Communications   Vol.E94-B   No.9   pp.2448-2453
Publication Date: 2011/09/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E94.B.2448
Print ISSN: 0916-8516
Type of Manuscript: INVITED PAPER (Special Section on Information Communication Technology for Highly Reliable Human Health Care Services)
brain-machine interface,  implantable device,  wireless,  brain surface electrodes,  motor restoration,  

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The brain-machine interface (BMI) is a new method for man-machine interface, which enables us to control machines and to communicate with others, without input devices but directly using brain signals. Previously, we successfully developed a real time control system for operating a robot arm using brain-machine interfaces based on the brain surface electrodes, with the purpose of restoring motor and communication functions in severely disabled people such as amyotrophic lateral sclerosis patients. A fully-implantable wireless system is indispensable for the clinical application of invasive BMI in order to reduce the risk of infection. This system includes many new technologies such as two 64-channel integrated analog amplifier chips, a Bluetooth wireless data transfer circuit, a wirelessly rechargeable battery, 3 dimensional tissue-fitting high density electrodes, a titanium head casing, and a fluorine polymer body casing. This paper describes key features of the first prototype of the BMI system for clinical application.