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Journal of NeuroEngineering and Rehabilitation

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Open Access 01-12-2015 | Research

An exploration of grip force regulation with a low-impedance myoelectric prosthesis featuring referred haptic feedback

Authors: Jeremy D. Brown, Andrew Paek, Mashaal Syed, Marcia K. O’Malley, Patricia A. Shewokis, Jose L. Contreras-Vidal, Alicia J. Davis, R. Brent Gillespie

Published in: Journal of NeuroEngineering and Rehabilitation | Issue 1/2015

Abstract

Background

Haptic display technologies are well suited to relay proprioceptive, force, and contact cues from a prosthetic terminal device back to the residual limb and thereby reduce reliance on visual feedback. The ease with which an amputee interprets these haptic cues, however, likely depends on whether their dynamic signal behavior corresponds to expected behaviors—behaviors consonant with a natural limb coupled to the environment. A highly geared motor in a terminal device along with the associated high back-drive impedance influences dynamic interactions with the environment, creating effects not encountered with a natural limb. Here we explore grasp and lift performance with a backdrivable (low backdrive impedance) terminal device placed under proportional myoelectric position control that features referred haptic feedback.

Methods

We fabricated a back-drivable terminal device that could be used by amputees and non-amputees alike and drove aperture (or grip force, when a stiff object was in its grasp) in proportion to a myoelectric signal drawn from a single muscle site in the forearm. In randomly ordered trials, we assessed the performance of N=10 participants (7 non-amputee, 3 amputee) attempting to grasp and lift an object using the terminal device under three feedback conditions (no feedback, vibrotactile feedback, and joint torque feedback), and two object weights that were indiscernible by vision.

Results

Both non-amputee and amputee participants scaled their grip force according to the object weight. Our results showed only minor differences in grip force, grip/load force coordination, and slip as a function of sensory feedback condition, though the grip force at the point of lift-off for the heavier object was significantly greater for amputee participants in the presence of joint torque feedback. An examination of grip/load force phase plots revealed that our amputee participants used larger safety margins and demonstrated less coordination than our non-amputee participants.

Conclusions

Our results suggest that a backdrivable terminal device may hold advantages over non-backdrivable devices by allowing grip/load force coordination consistent with behaviors observed in the natural limb. Likewise, the inconclusive effect of referred haptic feedback on grasp and lift performance suggests the need for additional testing that includes adequate training for participants.

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Title: An exploration of grip force regulation with a low-impedance myoelectric prosthesis featuring referred haptic feedback
Authors: Jeremy D. Brown
Andrew Paek
Mashaal Syed
Marcia K. O’Malley
Patricia A. Shewokis
Jose L. Contreras-Vidal
Alicia J. Davis
R. Brent Gillespie
Publication date: 01-12-2015
Publisher: BioMed Central
Published in: Journal of NeuroEngineering and Rehabilitation / Issue 1/2015
Electronic ISSN: 1743-0003
DOI: https://doi.org/10.1186/s12984-015-0098-1

2024 ASCO Annual Meeting

Springer Medicine

An exploration of grip force regulation with a low-impedance myoelectric prosthesis featuring referred haptic feedback

Abstract

Background

Methods

Results

Conclusions

2024 ASCO Annual Meeting

Springer Medicine

Abstract

Background

Methods

Results

Conclusions

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