Document Detail


Comparison of joint torque evoked with monopolar and tripolar-cuff electrodes.
MedLine Citation:
PMID:  14518785     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Using a self-sizing spiral-cuff electrode placed on the sciatic nerve of the cat, the joint torque evoked with stimulation applied to contacts in a monopolar configuration was judged to be the same as the torque evoked by stimulation applied to contacts in a tripolar configuration. Experiments were carried out in six acute cat preparations. In each experiment, a 12-contact electrode was placed on the sciatic nerve and used to effect both the monopolar and tripolar electrode configurations. The ankle torque produced by electrically evoked isometric muscle contraction was measured in three dimensions: plantar flexion, internal rotation, and inversion. Based on the recorded ankle torque, qualitative and quantitative comparisons were performed to determine if any significant difference existed in the pattern or order in which motor nerve fibers were recruited. No significant difference was found at a 98% confidence interval in either the recruitment properties or the repeatability of the monopolar and tripolar configurations. Further, isolated activation of single fascicles within the sciatic nerve was observed. Once nerve fibers in a fascicle were activated, recruitment of that fascicle was modulated over the full range before "spill-over" excitation occurred in neighboring fascicles. These results indicate that a four contact, monopolar nerve-cuff electrode is a viable substitute for a 12 contact, tripolar nerve-cuff electrode. The results of this study are also consistent with the hypothesis that multicontact self-sizing spiral-cuff electrodes can be used in motor prostheses to provide selective control of many muscles. These findings should also apply to other neuroprostheses employing-cuff electrodes on nerve trunks.
Authors:
Matthew D Tarler; J Thomas Mortimer
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Publication Detail:
Type:  Comparative Study; Evaluation Studies; Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  IEEE transactions on neural systems and rehabilitation engineering : a publication of the IEEE Engineering in Medicine and Biology Society     Volume:  11     ISSN:  1534-4320     ISO Abbreviation:  IEEE Trans Neural Syst Rehabil Eng     Publication Date:  2003 Sep 
Date Detail:
Created Date:  2003-10-01     Completed Date:  2003-10-30     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  101097023     Medline TA:  IEEE Trans Neural Syst Rehabil Eng     Country:  United States    
Other Details:
Languages:  eng     Pagination:  227-35     Citation Subset:  IM    
Affiliation:
Applied Neural Control Laboratory, Biomedical Engineering Department, Case Western Reserve University, Cleveland, OH 44106, USA. mdt4@po.cwru.edu
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MeSH Terms
Descriptor/Qualifier:
Animals
Ankle Joint / physiology*
Cats
Electric Stimulation*
Electrodes, Implanted*
Feasibility Studies
Isometric Contraction / physiology
Muscle, Skeletal / innervation*,  physiology*
Recruitment, Neurophysiological / physiology
Sciatic Nerve / cytology*,  physiology*
Torque
Grant Support
ID/Acronym/Agency:
N01-NS-32300/NS/NINDS NIH HHS

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


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