Simulation analysis of equivalent circuit model of skin-electrode impedance for transcutaneous electrical stimulation

Joni Welman Simatupang, Wilbert Wijaya, David Tyler, Clementine Mavridis

Abstract


For more than 50 years, transcutaneous electrical stimulation method has been used to cure the spinal cord injury, stroke or cerebral palsy. This method works by activating the excitable nerves, muscle fibers by electrical current stimulation through electrode interface to skin. Electrode to skin interface requires equivalent circuit to overcome the inability of measuring the skin resistivity directly. Therefore, equivalent circuit inside the E-textile must be modelled properly for it to represents the skin nature, which is resistive and capacitive. We have been learned several models after the skin from previous works, which are from Lawler, Moineau and Keller & Kuhn. Unfortunately, Moineau model neglects the capacitance effect (we then neglected this model in our simulation analysis), while Lawler and Keller and Kuhn include capacitive and resistive nature of skin in their equivalent circuits. Both models consisted of only one parallel RC block. This paper presents the simulation results of the proposed equivalent circuit model using two parallel RC circuits. Simulation of the proposed model is conducted in MATLAB 2015a and compared with two previous models (Lawler and Keller & Kuhn) using certain parameters. The results show that the proposed model obtained the impedance of 10.830 kΩ when it is simulated using 100Hz of frequency, for Lawler et.al model the impedance is 5.340 kΩ and Keller & Kuhn model the impedance obtained is 6.490 kΩ. Therefore, the proposed model has the refined impedance compared with other models and is expected to deliver better electrical stimulation.

Keywords


Capacitive; Electrical stimulation; Impedance; Resistive; Transcutaneous



DOI: https://doi.org/10.11591/eei.v10i4.3080

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