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Enhanced visual feedback for slip prevention with a prosthetic hand.

Erik D Engeberg1, Sanford Meek

  • 1University of Akron, Mechanical Engineering Department, ASEC, Room 113 Akron, OH 44325-3903, USA. engeberg@uakron

Prosthetics and Orthotics International
|March 10, 2012
PubMed
Summary

Upper limb amputees can now better control prosthetic hands using visual grip force feedback. This new technique significantly reduces object breakage when grasping brittle items.

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Area of Science:

  • Biomedical Engineering
  • Human-Computer Interaction
  • Prosthetics

Background:

  • Upper limb amputees lack direct grip force sensation from prosthetic hands, hindering precise object manipulation.
  • Visually assessing grip force is challenging, especially with rigid objects that show minimal deformation.

Purpose of the Study:

  • To evaluate the efficacy of visual grip force display for improving prosthetic hand object grasping.
  • To determine if visual feedback enhances control for upper limb amputees.

Main Methods:

  • An experimental controlled trial utilized a prosthetic hand with a visual force feedback system (bicolor LED).
  • Able-bodied subjects performed tasks with a brittle object, comparing a hybrid force-velocity sliding mode controller with and without visual feedback.

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Main Results:

  • The visual force feedback system led to a statistically significant reduction in object breakage.
  • Subjective evaluations and success rates confirmed the usefulness of the additional visual feedback.

Conclusions:

  • Visual grip force feedback effectively aids in manipulating brittle objects for prosthetic users.
  • This noninvasive, economical visual feedback technique offers significant improvements for handling delicate items.