• Title/Summary/Keyword: Myoelectric hand prosthesis

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Development of Surface Myoelectric Sensor for Myoelectric Hand Prosthesis

  • Choi, Gi-Won;Moon, In-Hyuk;Sung, So-Young;Lee, Mynug-Joon;Chu, Jun-Uk;Mun, Mu-Seong
    • 제어로봇시스템학회:학술대회논문집
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    • pp.1268-1271
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    • 2005
  • This paper proposes a compact-sized surface myoelectric sensor for myoelectric hand prosthesis. To fit the surface myoelectric sensor in the socket of the myoelectric hand prosthesis, the sensor should be a compact size. The surface myoelectric sensor is composed of a skin interface and a single processing circuit that are mounted on a single package. Since the skin interface has one reference and two input electrodes, and the reference electrode is located in middle of two input electrodes, we propose two types of sensors with the circle- and bar-shaped reference electrode, but all input electrodes are the bar-shaped. The metal material used for the electrodes is the stainless steel (SUS440) that endures sweat and wet conditions. Considering conduction velocity and median frequency of the myoelectric signal, we select the inter-electrode distance (IED) between two input electrodes as 18mm, 20mm, and 22 mm. The signal processing circuit consists of a differential amplifier with band pass filter, a band rejection filter for rejecting 60Hz power-line noise, amplifiers, and a mean absolute value circuit. We evaluate the proposed sensor from the output characteristics according to the IED and the shape of the reference electrode. From the experimental results we show the surface myoelectric sensor with the 18mm IED and the bar-shaped reference electrode is suitable for the myoelectric hand prosthesis.

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A Case Study of Myoelectric Hand Prosthesis for Upper Extremity Amputee (상지절단자용 전동의수 증례연구)

  • Kang, Ju-Ho;Kim, Myung-Hoe;Lee, Jeong-Weon
    • Physical Therapy Korea
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    • v.2 no.1
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    • pp.80-87
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    • 1995
  • The purpose of this case study was to introduce a myoelectric hand prosthesis for upper extremity amputee and prosthetic training program. Limb loss can result from disease, injury, or congenital causes. Trauma has been increasingly important role as the cause of amputaion in young, vigorous, and otherwise healthy individuals. The higher the level of amputation the greater the functional loss of the part, and the more the amputee must depend on the prostheis for fuction and cosmesis. Myoelectrical control of prostheses is a recent development and has been steadily gaining in clinical use over the past 20 years. Such a prosthesis uses signals from muscle contraction within the stump to activate a battery driven moter that operates specific component fuctions of the prosthesis. This twenty years old male case was operated a right above-elbow amputation due to tracffic accident and admitted to Yonsei Rehabilitaion hospital for the preprosthetic and prosthetic training. The case was able to successfully complete his myoelectric hand prosthesis training in the February of 1995.

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Study on a test method for the endurance of myoelectric hand prosthesis (근전의수의 내구성 시험방법에 대한 연구)

  • Choi, K.W.;Mun, M.S.
    • Journal of rehabilitation welfare engineering & assistive technology
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    • v.5 no.1
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    • pp.11-15
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    • 2011
  • This paper propose the test method for a performance of the myoelectric hand prosthesis(MHP) controlled according to the myoelectric signal generated in the human muscle. The MHP consists of a mechanical hand, a surface myoelectric sensor(SMES) for a measuring myoelectric signal, a control system and a charging battery. The two commercialized MHP is tested for the grip endurance property. The test results is not difference a noise and a grip force. The proposed test method is proved the reliability of MHP by the endurance test.

Study on a test method for the performance of myoelectric hand prosthesis (근전의수의 성능시험방법에 대한 연구)

  • Choi, Gi-Won;Choe, Gyu-Ha;Shin, Woo-Seok
    • Proceedings of the KIPE Conference
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    • pp.265-266
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    • 2010
  • This paper propose the test method for performance of myoelectric hand prosthesis(MHP) according to myoelectric signal generated in the human muscle. The MHP consists of a mechanical hand, a surface myoelectric sensor(SMES) for measuring myoelectric signal, a control system and a charging battery. The propose test method is proved the reliability of MHP.

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Grip Force Control of Myoelectric Signal Driving Type Myoelectric Hand Prosthesis (근전위 신호구동형 전동의수의 파지력 제어)

  • Choi, Gi-Won;Choe, Gyu-Ha;Shin, Woo-Seok
    • Proceedings of the KIPE Conference
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    • pp.340-342
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    • 2007
  • This paper presents the grip force control of myoelectric hand prosthesis according to myoelectric signal generated in the human muscle. The control system consist of a controller for driving DC motor, torque sensor for measuring out torque of motor, slip sensor for detecting slip of torque. The experimental results proved the reliability of proposed control system.

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Design of Control System for Myoelectric Signal Driving Type Myoelectric Hand Prosthesis (근전위 신호구동형 전동의수의 제어시스템 설계)

  • Choi, Gi-Won;Lee, Myung-Un;Ra, Sun-Gil;Choe, Gyu-Ha
    • The Transactions of the Korean Institute of Power Electronics
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    • v.12 no.3
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    • pp.248-257
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    • 2007
  • This paper presents the control system for driving myoelectric hand prosthesis according to myoelectric signal generated in the human muscle. A surface myoelectric sensor for measuring myoelectric signal is designed a skin interface and a processing circuit according to myoelectric signal output property. The control system consists of two controller for driving dual motor, torque sensor for measuring out torque of motor, slip sensor for detecting slip of torque. The experimental results proved the proposed control system.

A Study on the Control System of Myoelectric Hand Prosthesis (근전의수의 제어시스템에 관한 연구)

  • Choi, Gi-Won;Chu, Jun-Uk;Choe, Gyu-Ha
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.56 no.1
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    • pp.214-221
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    • 2007
  • This paper presents a myoelectric hand prosthesis(MHP) with two degree of freedom(2-DOF), which consists of a mechanical hand, a surface myoelectric sensor(SMES) for measuring myoelectric signal, a control system and a charging battery. The actuation for the 2-DOF hand functions such as grasping and wrist rotation was performed by two DC-motors, and controlled by myoelectric signal measured from the residual forearm muscle. The grip force of the MHP was automatically changed by a mechanical automatic speed reducer mounted on the hand. The skin interface of SMES was composed of the electrodes using the SUS440 metal in order to endure a wet condition due to the sweat. The sensor was embedded with a amplifier and a filter circuit for rejecting the offset voltage caused by power line noises. The control system was composed of the grip force sensor, the slip sensor, and the two controllers. The two controllers were made of a RISC-type microprocessor, and its software was executed on a real-time kernel. The control system used Force Sensing Resistors, FSR, as slip pick-ups at the fingertip of a thumb and the grip force information was obtained from a strain-gauge on the lever of the MHP. The experimental results were showed that the proposed control system is feasible for the MHP.

Development of Surface Myoelectric Sensor for Myoelectric Hand Prosthesis (근전의수용 소형 표면 근전위 센서의 개발)

  • Choi, Gi-Won;Sung, So-Young;Moon, Inhyuk
    • Journal of the Institute of Electronics Engineers of Korea SC
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    • v.42 no.6
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    • pp.67-76
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    • 2005
  • This paper proposes a compact-sized surface myoelectric sensor for the myoelectric hand prosthesis. To fit the surface myoelectric sensor in the socket for the myoelectric hand prosthesis, the sensor should be a compact size. The surface myoelectric sensor is. composed of a skin interface and a single processing circuit that are mounted on a single package. The skin interface has one reference and two input electrodes, and the reference electrode is located in the center of two input electrodes. In this paper we propose two types of sensors with the circle- and bar-shaped reference electrode, but all input electrodes are the bar-shaped. The metal material of the electrodes is the stainless steel (SUS440) that endures sweat and wet conditions. Considering the conduction velocity and the median frequency of the myoelectric signal, we select the inter-electrode distance (IED) between two input electrodes as 18mm, 20mm, and 22 mm. The signal processing circuit consists of a differential amplifier with a band pass filter, a band rejection filter for rejecting 60Hz power-line noise, amplifiers, and a mean absolute value circuit. We evaluate the proposed sensor from the output characteristics according to the IED and the shape of the reference electrode. From the experimental results we show the surface myoelectric sensor with the 18mm IED and the bar-shaped reference electrode is suitable for the myoelectric hand prosthesis.

Design of myoelectrical sensor for myoelectric hand prosthesis (전동의수용 근전위 센서 설계)

  • Choi, Gi-Won;Choe, Gyu-Ha
    • Proceedings of the KIPE Conference
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    • pp.247-249
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    • 2007
  • This paper proposes a dry-type surface myoelectric sensor for the myoelectric hand prosthesis. The designed surface myoelectric sensor is composed of skin interface and processing circuits. The skin interface has one reference and two input electrodes, and the reference electrode is located in the center of two input electrodes. Considering the conduction velocity and the median frequency of the myoelectric signal, the inter-electrode distance (IED) between two input electrodes as 18mm, 20mm, and 22mm is selected. The signal processing circuit consists of a differential amplifier with a band pass filter, a band rejection filter for rejecting 60㎐ power-line noise, amplifier, and a level circuit. Using SUS440, six prototype skin interface with different reference electrode shape and IED is fabricated, and their output characteristics are evaluated by output signal obtained from the forearm of a healthy subject. The experimental results show that the skin interface with parallel bar shape and the 18mm IED has a good output characteristics. The fabricated dry-type surface myoelectric sensor is evaluated for the upper-limb amputee.

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