Journal of Rehabilitation Research & Development (JRRD)

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Volume 48 Number 6, 2011
   Pages 661 — 668

Abstract —  Use of two-axis joystick for control of externally powered shoulder disarticulation prostheses

Robert D. Lipschutz, BSME, CP;1* Blair Lock, MS;1 Jonathon Sensinger, PhD;1-2 Aimee E. Schultz, MS;1 Todd A. Kuiken, MD, PhD1-2

1Center for Bionic Medicine, Rehabilitation Institute of Chicago, Chicago, IL; 2Department of Physical Medicine and Rehabilitation, Feinberg School of Medicine, Northwestern University, Chicago, IL

Abstract — We explored a new method for simple and accurate control of shoulder movement for externally powered shoulder disarticulation prostheses with a two-axis joystick. We tested 10 subjects with intact shoulders and arms to determine the average amount of shoulder motion and force available to control an electronic input device. We then applied this information to two different input strategies to examine their effectiveness: (1) a traditional rocker potentiometer and a pair of force-sensing resistors and (2) a two-axis joystick. Three nondisabled subjects and two subjects with shoulder disarticulation amputations attempted to control an experimental externally powered shoulder using both control strategies. Two powered arms were tested, one with powered flexion/extension and humeral rotation and one with powered flexion/extension and adduction/abduction. Overwhelmingly, the subjects preferred the joystick control, because it was more intuitively linked with their shoulder movement. Additionally, two motions (one in each axis) could be controlled simultaneously. This pilot study provides valuable insight into an effective means of controlling high-level, externally powered prostheses with a two-axis joystick.

Key words: control strategies, externally powered prosthesis, force-sensing resistor, joystick, proportional control, proprioception, rocker potentiometer, shoulder disarticulation, shoulder excursion, upper-limb amputation.


View HTML  ¦  View PDF  ¦  Contents Vol. 48, No. 6
This article and any supplementary material should be cited as follows:
Lipschutz RD, Lock B, Sensinger J, Schultz AE, Kuiken TA. Use of two-axis joystick for control of externally powered shoulder disarticulation prostheses. J Rehabil Res Dev. 2011;48(6):661-68.
DOI:10.1682/JRRD.2010.04.0072
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Last Reviewed or Updated  Monday, July 11, 2011 9:21 AM

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