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Development of Artificial Leg synchronizing with A Healthy One

Research Project

Project/Area Number 19K11326
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 59010:Rehabilitation science-related
Research InstitutionIwate Prefectural University

Principal Investigator

Murata Yoshitoshi  岩手県立大学, その他部局等, 特命教授 (80444925)

Co-Investigator(Kenkyū-buntansha) 西村 行秀  岩手医科大学, 医学部, 教授 (20464117)
Project Period (FY) 2019-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2021: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords義足 / 駆動義足 / 健足同期 / 歩行 / アシスト / 歩行障害 / SACH / 健足歩行 / 踵 / 歩行アシスト
Outline of Research at the Start

低価格で自然な歩行を可能とする高機能駆動義足を開発する。具体的には、既存の廉価な駆動義足に取り付ける部品として、足部の底屈・背屈を行うInstep Push/Pull、踵上げを補助するHeel-up spring、つま先垂れによる躓きを防止するToe ballを開発する。Instep Push/Pullには一軸小型ステッピングモータを利用する。Heel-up springと Instep Push/Pullを健足に同期して制御することで、学習の手間がなく健常に高い歩行を実現する。これらの部品を片麻痺等で歩行障がいのある方の靴に取り付けられるようにすることで、量産効果による低廉化を図る。

Outline of Final Research Achievements

Several million people around the world live with limb loss. Prosthetics are useful to improve their quality of life, and some powered prosthetics enable them to walk naturally. However, most are too expensive for most amputees to afford. We develop a low-cost one that adopts the instep push/pull module to move the foot part of prosthesis and the heel raising unit (HRU) to assist raising the heel part. Experimental results of HRU demonstrate that the optimal spring stiffness of such devices linearly correlates with the body weight, and controlling release timing of the spring improves its assistance effect.
However, in experimenting of the instep push/pull module, we had two problems, one was power shortage of an initial version of cylinder motor, the other was that the motor driver of higher power motor was broken because of regenerative energy. After solving such problems, we have evaluated a new module by prosthetic user to improve its control algorithms.

Academic Significance and Societal Importance of the Research Achievements

下肢切断者の平均年齢の上昇が著しく、特に疾病を原因とする下肢切断者が高齢者に増加している。高機能義足は、義足使用者のQOL向上に有効であるが、商用品は全て海外製で高価かつ保険適用外であることから、一般障がい者が購入・利用するのは難しい状況にある。
本研究開発では、工業用モータによる義足・足部の上下駆動部Instep Push/Pullと踵部に装着したHeel-Raising Unit を開発し、健足側に装着したセンサのデータを基に制御することで、低コストかつスムースに歩行出来る高機能義足を実現する。それにより、筋力が低下している高齢の障がい者でも購入・利用可能とし、彼らのQOL向上に資する。

Report

(6 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (6 results)

All 2022 2020 2019

All Journal Article (1 results) Presentation (4 results) (of which Int'l Joint Research: 4 results) Patent(Industrial Property Rights) (1 results)

  • [Journal Article] Spring Assist Unit for Individuals with Walking Disabilities2020

    • Author(s)
      Haruki Baba, Akimasa Suzuki, Yoshitoshi Murata
    • Journal Title

      IARIA, International Journal on Advances in Life Sciences

      Volume: vol 12 no 3 & 4 Pages: 102-113

    • Related Report
      2020 Research-status Report
  • [Presentation] Assistance Effect of an Evolved Heel-Raising Unit for Walking Disabilities2022

    • Author(s)
      Haruki Baba, Akimasa Suzuki, Yoshitoshi Murata
    • Organizer
      IARIA, eTELEMED 2022
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Proposal of Powered Foot Prosthesis Emulating Motion of Healthy Foot (PEHF)2020

    • Author(s)
      Yoshitoshi Murata, Haruki Baba, Yukihide Nishimura
    • Organizer
      IARIA, eTELEMED 2020
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Proposal of Spring Assist Unit for Walking Disabilities2020

    • Author(s)
      Haruki Baba, Yoshitoshi Murata, Tomoki Yamato
    • Organizer
      IARIA, eTELEMED 2020
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Module Structure for Foot Prosthetic and Interface Standardization2019

    • Author(s)
      Yoshitoshi Murata, Tomoki Yamato
    • Organizer
      ITU, 2019 ITU Kaleidoscope Academic Conference
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Patent(Industrial Property Rights)] 歩行補助装置2019

    • Inventor(s)
      村田嘉利
    • Industrial Property Rights Holder
      村田嘉利
    • Industrial Property Rights Type
      特許
    • Industrial Property Number
      2019-163887
    • Filing Date
      2019
    • Related Report
      2019 Research-status Report

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Published: 2019-04-18   Modified: 2025-01-30  

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