Electrodes underpin electrophysiological signals recording,requiring stable skin contact and low impedance for high-quality,long-term acquisition.Dry microneedle electrodes penetrate the stratum corneum and bypass hai...Electrodes underpin electrophysiological signals recording,requiring stable skin contact and low impedance for high-quality,long-term acquisition.Dry microneedle electrodes penetrate the stratum corneum and bypass hair to ensure robust contact,but conventional rigid designs lack tissue conformity,risking discomfort and injury.This work introduces a modulus-adjustable,mechanically adaptive dry microneedle electrode(MDME)constructed from PEDOT:PSS and shape memory polymer.Submillimeter MDME penetrates skin barriers and,upon body temperature activation,softens to match tissue mechanics,minimizing invasiveness.The MDME exhibits low,stable interface impedance and enables high-quality electromyography,electrocardiography,electroencephalography,and electrocorticography recordings.After one month of usage,the electrophysiological root mean square noise increased by only 6μV,compared to 63μV of Ag/AgCl gel electrodes.Electroencephalogram signal-to-noise reached 8.12 dB versus 7.26 dB for the cranial screw electrodes.This work represents a notable advancement in MDME-based electrophysiological recording,expanding its potential applications in personalized healthcare and human-machine interaction.展开更多
基金supported by the National Natural Science Foundation of China under grant numbers 62422104(G.Y.),U21A20460(Y.L.),62371115(G.Y.),52021001(Y.L.)Science and Technology Major Project of Xizang Autonomous Region of China under grant no.XZ202201ZD0001G(G.Y.)+1 种基金Science and Technology Department of Sichuan Province under grant no.2024NSFSC0234(G.Y.)the Medico-Engineering Cooperation Funds,Fundamental Research Funds for the Central Universities,UESTC under grant nos.ZYGX2020ZB041(G.Y.),ZYGX2021YGLH002(G.Y.).
文摘Electrodes underpin electrophysiological signals recording,requiring stable skin contact and low impedance for high-quality,long-term acquisition.Dry microneedle electrodes penetrate the stratum corneum and bypass hair to ensure robust contact,but conventional rigid designs lack tissue conformity,risking discomfort and injury.This work introduces a modulus-adjustable,mechanically adaptive dry microneedle electrode(MDME)constructed from PEDOT:PSS and shape memory polymer.Submillimeter MDME penetrates skin barriers and,upon body temperature activation,softens to match tissue mechanics,minimizing invasiveness.The MDME exhibits low,stable interface impedance and enables high-quality electromyography,electrocardiography,electroencephalography,and electrocorticography recordings.After one month of usage,the electrophysiological root mean square noise increased by only 6μV,compared to 63μV of Ag/AgCl gel electrodes.Electroencephalogram signal-to-noise reached 8.12 dB versus 7.26 dB for the cranial screw electrodes.This work represents a notable advancement in MDME-based electrophysiological recording,expanding its potential applications in personalized healthcare and human-machine interaction.
