• Top page
  • Timetable
  • Per session
  • Per presentation
  • How to
  • Meeting Planner

演題詳細

Poster

ブレイン・マシン/コンピュータ・インターフェイス
BMI/BCI

開催日 2014/9/13
時間 11:00 - 12:00
会場 Poster / Exhibition(Event Hall B)

視覚皮質補綴に向けた無線通信および無線電力伝送機能を備えた多チャンネル刺激システム
A Multi-channel Stimulation System with Wireless Communication and Power Transmission for Visual Cortical Prostheses

  • P3-369
  • 亀田 成司 / Seiji Kameda:1 鎌田 隆嗣 / Takatsugu Kamata:1 林田 祐樹 / Yuki Hayashida:2 武内 良典 / Yoshinori Takeuchi:3 今井 正治 / Masaharu Imai:3 八木 哲也 / Tetsuya Yagi:2 
  • 1:大阪大・MEIセンター / MEI Center, Osaka Univ, Osaka, Japan 2:大阪大院工電気電子情報工学 / Grad Eng, Osaka Univ, Osaka, Japan 3:大阪大院情報科学 / Grad Info, Osaka Univ, Osaka, Japan 

For visual prostheses by means of intracortical microstimulation, it is necessary to develop devices that can generate spatio-temporal patterns of electrical stimuli to drive a large number of electrodes according to frame-sampled images. Here, we developed a prototype stimulation system consisting of a multi-channel current stimulator and wireless data/power transmitter and receiver controlled with microprocessors. The stimulator chip with the die size of 3.5×3.5 mm2 was fabricated with 0.25-μm CMOS VLSI technology, to implement parallel eight current generators and multiplexers. The chip generates biphasic stimulus pulses through 64 electrodes in time-sharing mode at up to 200 frames/sec. The stimulus parameters can be set for each electrode by digital codes stored in built-in registers. On demand, the combination of anode and cathode electrodes for passing the stimulus current can be changed online. The maximal amplitude of the stimulus pulse is ˜±400 μA/phase at ±2.5 V supply. As for the wireless power transmission, a pair of 20-mm-diameter coils with a 5-mm gap was employed and the operational frequency is adjustable by programming on embedded microprocessors, in a range from 250 to 425 kHz with 1-kHz step. The available output power at ±2.5 V supply is up to 0.25 W. The wireless data communication was realized with discrete System-on-a-Chip components, by which the stimulus parameters as well as any data set via SPI bus format are transmitted/received between the transmitter and receiver. The signal quality of 2-Mbps data rate at 2.4-GHz band without packet/bit error was verified by using random 19-byte-length data with 0-dBm transmit power, with an inter-module distance of 1 cm or less. The receiver without the coil is 23×26×3 mm in width, length and height, respectively, and the total weight is 5 g including the coil.

Copyright © Neuroscience2014. All Right Reserved.