简介：Itiscurrentlydifficultfortheamputeetoperceiveenvironmentalinformationsuchastactilepressureonthefingertipofthepresentupperlimbprostheses.Sensoryfeedbackinducedbycutaneouselectricalstimulationcanbeusedtotransmittactileinformationfromhandprosthesestosensorynerveofintactupperarm,thusproducingthecorrespondingperceptionsinhumanbrain.Inordertohaveadeeperunderstandingonthedistributionofstimulationcurrentwithinthelimb,andfindabetterplacementofthestimulatingandreferenceelectrodes,weconstructedathree-dimensionalupper-limbmodeltosystematicallystudytheeffectofelectrodeplacementoncurrentdistributionbasedonfiniteelementanalysis.Inthesesimulations,thereferenceelectrodeispositionedatfourdifferentlocationsaroundandontheaxialdirectionofthearm.Theresultsshowthatwiththeincreaseofdistancebetweenreferenceelectrodeandstimulatingelectrode,thecurrentdensityincreasesintheskinlayeroftheupperlimb.Whenthereferenceelectrodeisontheoppositesideofstimulatingelectrodearoundthearm,thecurrentismoreconcentratedintheskinlayer,whichisinlinewithrecentfindingsinpsychophysiologicalexperiments.Butbetterspatialselectivitycouldbeachievedwhenthereferenceelectrodeisclosertothestimulatingelectrodearoundthearm,anditismoreobviousincomparisonwiththatontheaxialdirection.Thesefindingswillprovideinsightsforthedesignofelectrodearrayusedforevokingcutaneoussensoryafferents.
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