Document Detail

Cognitive feedback for use with FES upper extremity neuroprostheses.
MedLine Citation:
PMID:  2026429     Owner:  NLM     Status:  MEDLINE    
This paper describes the development of two sensory substitutions systems that provide cognitive feedback for FES hand grasp restoration neuroprostheses. One system uses an array of five electrodes to provide machine status information and a spatially encoded representation of the command signal that a quadriplegic individual generates to achieve proportional grasp control. Only one electrode site is active at any given instant, and a second informational channel is superimposed on the spatial position channel by modulating the frequency of the stimulus pulses. The frequency modulated feedback channel signals six levels of force developed at the finger tips during prehension activities. The second sensory system is an integral part of an implanted FES system and utilizes a single subdermally placed electrode to display machine status information and a five-level frequency code for feedback of the user generated grasp control signal. The multielectrode feedback system was implemented for laboratory studies using surface mounted electrodes, although its design will ultimately incorporate subdermal electrodes to provide a highly cosmetic and unencumbering system. An evaluation of the effectiveness of grasp force and command signal feedback provided by this multielectrode system in assisting an FES hand system user to regulate grasp force during a laboratory task, showed increased consistency of performance and an economy of grasp effort between 25 and 30%. Alternative strategies for feedback information and coding algorithms are discussed.
R R Riso; A R Ignagni; M W Keith
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  IEEE transactions on bio-medical engineering     Volume:  38     ISSN:  0018-9294     ISO Abbreviation:  IEEE Trans Biomed Eng     Publication Date:  1991 Jan 
Date Detail:
Created Date:  1991-06-10     Completed Date:  1991-06-10     Revised Date:  2009-11-11    
Medline Journal Info:
Nlm Unique ID:  0012737     Medline TA:  IEEE Trans Biomed Eng     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  29-38     Citation Subset:  IM    
Department of Biomedical Engineering, Case Western Reserve University, Cleveland, OH 44109.
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MeSH Terms
Electric Stimulation Therapy / methods*
Evaluation Studies as Topic
Hand / physiopathology*
Prosthesis Design
Quadriplegia / rehabilitation*
Sensation / physiology
Grant Support

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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