Browsing by Keyword "Electrical stimulation"
Now showing 1 - 2 of 2
Results Per Page
Sort Options
Item Compact electrotactile stimulation and EMG acquisition system with embedded blanking of stimulation artifacts(Institute of Electrical and Electronics Engineers Inc., 2019-11) Strbac, Matija; Isakovic, Milica; Malesevic, Jovana; Keller, Thiery; Ilic, Vojin; Jorgovanovic, Nikola; Dosen, Strahinja; SG; Tecnalia Research & InnovationWe present a miniaturized closed-loop system for myoelectric control and electrotactile feedback in upper limb prostheses. The system integrates an electrotactile stimulator, which allows synchronous and asynchronous distribution of stimulation pulses, and an acquisition system for the simultaneous recording of multichannel EMG. The stimulator generates biphasic, current controlled pulses (amplitude: 0-5 mA; duration: 50-500 us; frequency: 1-100 Hz), which are routed by a demultiplexing circuitry to any of the 16 output channels. The acquisition system can be configured to record 8 bipolar or 16 monopolar EMG channels with a sampling frequency in the range from 500 Hz to 2 kHz. Embedded firmware incorporates direct calculation of ARV or RMS in the defined time window, as well as direct blanking of recording channels for the duration of the stimulation pulse artifact. Based on initial tests in a simple experimental setup we can determine that the developed system and proposed blanking algorithm can be used to record EMG signals during simultaneous delivery of electrical stimulation in challenging conditions (e.g., close electrode placement, high stimulation intensity).Item Design and Development of OECT Logic Circuits for Electrical Stimulation Applications(2022-04-14) Kostić, Miloš; Kojić, Vladimir; Ičagić, Savo; Andersson Ersman, Peter; Mulla, Mohammad Yusuf; Strandberg, Jan; Herlogsson, Lars; Keller, Thierry; Štrbac, Matija; Tecnalia Research & Innovation; SGThis paper presents the first successful implementation of fully printed electronics for flexible and wearable smart multi-pad stimulation electrodes intended for use in medical, sports and lifestyle applications. The smart multi-pad electrodes with the electronic circuits based on organic electrochemical transistor (OECT)-based electronic circuits comprising the 3–8 decoder for active pad selection and high current throughput transistors for switching were produced by multi-layer screen printing. Devices with different architectures of switching transistors were tested in relevant conditions for electrical stimulation applications. An automated testbed with a configurable stimulation source and an adjustable human model equivalent circuit was developed for this purpose. Three of the proposed architectures successfully routed electrical currents of up to 15 mA at an output voltage of 30 V, while one was reliably performing even at 40 V. The presented results demonstrate feasibility of the concept in a range of conditions relevant to several applications of electrical stimulation.