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Assistance of the elbow flexion motion on the active elbow orthosis using muscular stiffness force feedback

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Abstract

An elbow orthosis with pneumatic artificial muscles has been developed to assist and enhance upper limbs movements and has been examined for effectiveness. The effectiveness of the elbow orthosis was examined by comparing muscular activities during alternate dumbbell curl motion wearing and without wearing the orthosis. The subjects participating in the experiment were young adults in their twenties. The subjects were instructed to perform a dumbbell curl motion in a sitting position with and without wearing an orthosis in turn, and a dynamometer was used to measure elbow joint torque in isokinetic mode. The measurements were done with four various dumbbell loads: 0, 1, 3, and 5 kg. We examined the effectiveness of the elbow orthosis in two control methods. First, the orthosis was pneumatically actuated and controlled in the passive control mode. Then, it was controlled in the active control mode using the muscular stiffness force of the muscle that is measured from a force sensor through a cDAQ-9172 board. For the analysis of muscular power, the muscular activities of the subject were measured during alternate dumbbell curl motion using MP150 (BIOPAC Systems, Inc.). The muscles of interest were biceps brachii muscle, triceps brachii muscle, brachioradialis muscle, and flexor carpi ulnaris muscle in the upper limbs of the right side. The elbow joint torque was measured during elbow flexion motion using a dynamometer at 60° per second for isokinetic strength. The experimental result showed that the muscular activities wearing the elbow orthosis were reduced and elbow joint torque wearing the elbow orthosis was higher because of the assist of the orthosis. As a result of this experiment, the effectiveness of the developed elbow orthosis was confirmed and the level of assistance was quantified. With this, we confirmed the effectiveness of the developed elbow orthosis.

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Authors and Affiliations

  1. Department of Rehabilitative & Assistive Technology, National Rehabilitation Research Institute, Seoul, Korea

    Kyung Kim

  2. Division of Biomedical Engineering, College of Engineering, Chonbuk National University, Jeonju, Korea

    Kyung-Ju Hong & Tae-Kyu Kwon

  3. Sixty Puls Co., Seoul, Korea

    Nam-Gyun Kim

  4. Research Center of Healthcare & Welfare Instrument of the Aged, Chonbuk National University, Jeonju, Korea

    Tae-Kyu Kwon

Authors
  1. Kyung Kim
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  2. Kyung-Ju Hong
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  3. Nam-Gyun Kim
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  4. Tae-Kyu Kwon
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Corresponding author

Correspondence to Tae-Kyu Kwon.

Additional information

This paper was recommended for publication in revised form by Associate Editor Sungsoo Rhim

Kyung Kim received his B.S, M.S and Ph.D in Biomedical Engineering from Chonbuk National University, South Korea, in 2003, 2005 and 2010, respectively. His research interests include rehabilitation engineering and biomechatronics.

Kyung-Ju Hong received her M.S in Biomedical Engineering from Chonbuk National University, South Korea, in 2007. Her research interests include rehabilitation engineering and biomechatronics.

Nam-Gyun Kim received his Ph.D from the University of Strasbourg in 1987. Dr. Kim’s research interests include postural control, rehabilitation engineering.

Tae-Kyu Kwon received his Ph.D from Tohoku University, Japan, in 1999. Prof. Kwon’s research interests include rehabilitation engineering, biomechatronics.

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Kim, K., Hong, KJ., Kim, NG. et al. Assistance of the elbow flexion motion on the active elbow orthosis using muscular stiffness force feedback. J Mech Sci Technol 25, 3195–3203 (2011). https://doi.org/10.1007/s12206-011-0923-9

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  • DOI: https://doi.org/10.1007/s12206-011-0923-9

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