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Biomedical Engineering Study on a Design of Cochlear Implants.

Research Project

Project/Area Number 61490002
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field 広領域
Research InstitutionHokkaido University.

Principal Investigator

IFUKUBE Tohru  Research Institute of Applied Electricity, Hokkaido University Associate Professor, 応用電気研究所, 助教授 (70002102)

Co-Investigator(Kenkyū-buntansha) TERAYAMA Yoshihiko  Medical School, Hokkaido University, 医学部, 教授 (90000976)
FUTAMI Ryouko  Research Institute of Applied Electricity, Hokkaido University Assiatant Profess, 応用電気研究所, 助手 (20156938)
HOSHIMIYA Nozomu  Research Institute of Applied Electricity, Hokkaido University Professor, 応用電気研究所, 教授 (50005394)
Project Period (FY) 1986 – 1987
Project Status Completed (Fiscal Year 1987)
Budget Amount *help
¥4,500,000 (Direct Cost: ¥4,500,000)
Fiscal Year 1987: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1986: ¥3,500,000 (Direct Cost: ¥3,500,000)
KeywordsCochlear Implant / Speech Processing / 刺激電極 / 人工内耳 / 聴覚障害者補助 / 音声認識
Research Abstract

A purpose of this research is to do fundamental experiments regarding an optimal design of the cochlear implant that electrically stimulates the survival auditory nerves for the deaf. Researches carried out are the following 4 points.
(1)It was investigated what kind of current distribution produces inside the cochlea of a human cadaver when electrodes were inserted into the cochlea. (2) A spwwch processor was developed on the basis of the above result and the discrimination ability of synthetic vowels was evaluated by a subject implanted with an eight channel cochlear prosthesis. (3) A new model of the electrode for the extracochlear implant was developed as a less invasive alternative to electrode insertion in the cochlea. (4) Such a speech coding method that discrimination of vowels is possible with single channel method was proposed and its efficacy was evaluated by an animal experiment.
As results, (1) a stimulation current path from the inside of the cochlea to the outside wlarifie … More d. It is found out that a stimulation current spreads largely outside the cochlea (T.Ifukube, 1987a). (2) A speech processor that had a function of lateral inhibition was designed in order to compensate for the wide current spread and its efficacy was confirmed by a recognition experiment of synthesis vowels (T.Ifukube, 1987b). (3)A Pt-Ir wire electrode covered with Polyvinyl alcohol gel including saline solution was developed as a stimulation electrode for a single channel extracochlear implant. The electrical characteristics of the electrode was checked and it was ascertained that the electrode had almost the same characteristics as human body (T.Ifukube, et al, 1988, J.Matsushima et al, 1988). (4) the speech processor for a single channel cochlear implant was designed which produced a time sequential stimulation pulses obtained by combining pitch signals and the second formant frequency of voices. The efficacy of this coding method was proved from a view point of compound action potential responded to stimulation that gave to the cochlea of guinea pig (T.Ifukube et al, 1988, K.Takahashi et al, 1988). Less

Report

(2 results)
  • 1987 Final Research Report Summary
  • 1986 Annual Research Report
  • Research Products

    (21 results)

All Other

All Publications (21 results)

  • [Publications] Ifukube, Tohru: IEEE Trans., on BME. 34. 876-882 (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Ifukube, Tohru: IEEE Trans., on BME. 34. 883-890 (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Ifukube, Tohru: IEEE Trans., on BME. (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] 松島純一: 日本耳鼻咽喉科学会会報. 76. (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] 伊福部達: 電子情報通信学会技術研究報告. SP87-71. 1-8 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] 高橋国広: 耳鼻咽咽科臨床. 81. (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] 伊福部達: "新編感覚知覚心理学ハンドブックー人工中耳・人工内耳-" 誠信書房, (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] 伊福部達: "機械工学便覧-聴覚障害者用機器-" 日本機械学会, (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] T.Ifukube, R.L.White: "Current distribution produced inside and outside the cochlea from a scala tympani electrode array." IEEE Trans., BME. 34. 876-882 (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] T.Ifukube, R.L.White: "A speech processor with lateral inhibition for an eight channel cochlear implant and its evaluation." IEEE Trans., BME. 34. 883-890 (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] T.Ifukube, Y.Hirata, J.Matsushima: "A stimulation electrode covered with polyvinyl alcohol gel for an extracochlear prosthesis." IEEE Trans., BME. in press. (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] J.Matsushima, K.Takahashi, M.Kumagai, Y.Terayama, T.Ifukube: "An electrophysiological study of stimulation electrode using polyvinyl alcohol gel." Journal of Otolaryngology of japan. 76. (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] T.Ifukube, K.Hirata, J.Matsushima: "A basic study on extracochlear implant - on speech coding-." Report of the Institute of Electronics, Information and Communication Engineers.sp87-81. 1-8 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] T.Ifukube: Handbook of Sensory and perception, SEISHIN Publishing Company.Cochlear Implant, (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Tohru Ifukube;Robert L.Wite: Proceedings of IEEE-IECEJ-ASJ International Conference on Acoustics,Speech,and Signal Processing. 617-620 (1986)

    • Related Report
      1986 Annual Research Report
  • [Publications] 宮前孝一,伊福部達,松島純一,星宮望: 電子通信学会技術研究報告. SP86-107. 1-8 ()

    • Related Report
      1986 Annual Research Report
  • [Publications] 松島純一,高橋国広,原田千洋,寺山吉彦,伊福部達: 日本オージオロジー学会誌. (1987)

    • Related Report
      1986 Annual Research Report
  • [Publications] 高橋国広,松島純一,熊谷雅彦,寺山吉彦,伊福部達: 日本オージオロジー学会誌. (1987)

    • Related Report
      1986 Annual Research Report
  • [Publications] Tohru Ifukube;Robert L.white: IEEE Transactions on Biomedical Engineering. (1987)

    • Related Report
      1986 Annual Research Report
  • [Publications] Tohru Ifukube;Robert L.White: IEEE Transactions on Biomedical Engineering. (1987)

    • Related Report
      1986 Annual Research Report
  • [Publications] 伊福部達: "新編感覚・知覚心理学ハンドブックー人工中耳・人工内耳ー" 誠信書房, 20 (1987)

    • Related Report
      1986 Annual Research Report

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Published: 1987-03-31   Modified: 2016-04-21  

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