研究内容 research

筋電義手開発

[English]

当院リハビリテーション科、横浜国立大学加藤研究室電気通信大学横井研究室との共同で以下の研究を行っている。

主な研究内容

1.多自由度義手の解析

現在の義手は手指屈伸のみで手指屈伸と同時に前腕回内外、肘屈伸など複数の動作を行うことが困難である。そこで開発した多自由度の筋電義手についてできるだけ多くの評価項目(タイムラグ、握力、ピンチ力、機能評価、表面筋電図、針筋電図、MRI)で有用性の検証を行っている。必要に応じて神経移行手術を行い効率よい義手動作を行えるように検討している。


開発中の筋電義手


高耐久性超弾性シリコン材料クリスタルゲルを用いて製作された試作グローブ

2.ARシミュレーターを用いた筋電義手リハビリテーション

筋電義手装着後のリハビリサポートをするためAR (augmented reality, 拡張現実)シミュレーターを用いて神経移行術後のバイオフィードバック訓練を積極的に行い、評価していく。

新聞・雑誌・TV

●2016年12月2日 朝日新聞記事

上腕だけでも筋電義手「神経移行」手術で

朝日新聞記事

●2017年2月5日 テレビ神奈川放映

カナフルTV」(平成29年2月5日 特集!さがみロボット産業特区

現在、神奈川県さがみ産業ロボット特区の重点プロジェクトで行っている。

東海大学医学部の倫理研究審査委員会の承認(臨審委第14R-199号)を得て、生まれつき腕の欠損患者、事故などによる腕の切断患者への治療の一貫で義手を動かしてもらう研究を行っています。

東海大学医学部 外科学系整形外科学 高木岳彦 E-mail:ttkg7@tokai-u.jp

*お問い合わせはメールにて受け付けております。

Myoelectric Hands

[Japanese]

A research is collaborated with Department of Rehabilitation Medicine, Tokai University School of Medicine, Cyber-Robotics Lab, Yokohama National University (Kato Lab), and University of Electro-Communications (Yokoi Lab).

Articles and programs:

* This study was mentioned in an article published by Asahi Shimbun (December 2, 2016). The article was entitled “Nerve transfer surgery allows for making a myoelectric prosthetic hand, even in patients whose upper limb consists of only the upper arm.”

朝日新聞記事

* This study was mentioned by Television KANAGAWA (TVK) in the program “Kana-ful TV” (February 5, 2017).

In addition, this is currently being conducted a Priority Project at the Robot Town Sagami.

1.Analysis of hand prostheses.

The currently available prosthesis allows for finger flexion only and does not allow for multiple movements such as forearm pronation/supination or elbow flexion. Therefore, in a study of a myoelectric hand with multiple degrees of freedom that we have developed, we verified its utility by using as many evaluation items as possible (time lag, grip strength, pinch force, functional assessment, surface electromyography, needle electromyography, and magnetic resonance imaging). When needed, nerve transfer surgery was performed, and studies were carried out aimed at allowing efficient prosthetic hand movements.

Prototype glove is made of crystal gel, a material used for manufacturing highly durable hyperelastic silicone.

2.Myoelectric hand rehabilitation using an augmented reality (AR) simulator

To support the patient with the myoelectric hand, biofeedback training is carried out after nerve transfer surgery by using an AR simulator.

Clinical trial

We are conducting a clinical trial (see below) to move the prosthetic hands consistently for patients with congenital arm deficiencies as well as patients with acquired amputated arms (e.g. after accidents), under an approval by clinical research ethics review board at Tokai University School of Medicine (Approval number, 14R-199).

Recruitment of study participants

Takehiko Takagi
Department of Orthopaedic Surgery, Tokai University School of Medicine
E-mail: ttkg7@tokai-u.jp We accept inquiries by e-mail.

A research group led by Assistant Professor Takehiko Takagi has developed a "Myoelectric hand with a learning function allowing for the device to be adjusted to each individual user" and a clinical trial has been started.

November 26, 2015

A research group led by Assistant Professor Takehiko Takagi, Department of Orthopaedic Surgery, specialized in hand and peripheral nerve surgery, and his collaborators successfully developed an intelligent electric hand prosthesis with a myoelectrically controlled device equipped with a learning function allowing for the latter to adapt to each individual user. The study was started in 2010, mainly by Dr. Hiroshi Yokoi, a professor at the University of Electro-Communications and a head of the aforementioned university's Brain Science-Inspired Life Support Research Center. Ever since, the study has been carried out with support from the Japan Society for the Promotion of Science that provided a grant-in-aid for scientific research, the Japan Science and Technology Agency, as well as the Japan Agency for Medical Research and Development (AMED) through the Adaptable and Seamless Technology Transfer Program through target-driven research and development (A-STEP) and through the AMED's Strategic Research Program for Brain Sciences (SRPBS). On the November 11, 2015, the University of Electro-Communications held a press conference, reported their research results, and called for collaboration in conducting clinical tests.

A myoelectric hand is a prosthetic hand whose movements are controlled by electrical signals that are generated for producing muscle movements (myopotentials). Because of differences in intensities and patterns of electrical signals, training was time-consuming, and the device was expensive and heavy and could only be used on a limited number of people. The myoelectric hand that we developed in this study was a robot hand with a learning function that allows for the prosthetic hand to easily remember muscle movements of each individual user. When the user moves his/her muscles in a way as to “grasp” or “open” his/her hands, the patterns of electrical signals corresponding to those movements are input into the built-in miniature microcomputer inside the prosthetic hand. When a user wears the prosthesis and makes muscles exert some force in the same manner, he/she will be able to manipulate the device according to his/her own will, and will be able to use it after practicing for a short period of time.

In addition, the main parts, such as the myoelectric control system, the sensors, and the motor, have been modularized and made compact and lightweight, allowing for cost reduction. The glove part of the prosthesis was modeled with a 3D printer by using highly flexible material, allowing for achieving ideal shapes and thickness; as a result, movements such as “pinching a coin,” “grabbing a soft object such as a paper cup,” and “tying shoelaces” have been made possible. In addition to being suitable for various sizes ranging from infants to adults, this device can also be incorporated into existing decorative hand prostheses, and can be easily used by first-timers and by people with low residual muscle mass.

Next, in an effort to designate parts needed to complete the prosthetic device as established by the Japanese Ministry of Health, Labour and Welfare, we plan on carrying out clinical tests on study participants and collaborating with experts to evaluate the device's utility in daily life. Professor Takagi says: “The research-and-development phase of this study has been brought to completion, and now we are finally about to start clinical trials aimed at the commercialization and distribution of this product. We have reception desks at Tokai University School of Medicine, as well as at National Center for Child Health and Development, where we accept applications for enrollment as study participants. We hope that many people will cooperate with us.”

  • 東海大学医学部整形外科専門研修プログラム 見学申込はこちら
  • Voice 医局員の声 当科のやりがいや魅力を紹介
  • Research 研究内容紹介 トップレベルの研究を世界に発信
  • Research 研究内容紹介 1700件(2014年)を超える手術を施行

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