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Article

Experimental Characterization of Ferroelectric Capacitor Circuits for the Realization of Simply Designed Electroceuticals

Fraunhofer Institute for Biomedical Engineering IBMT, 66280 Sulzbach/Saar, Germany
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Author to whom correspondence should be addressed.
Academic Editors: Lucian Pintilie and Marina Tyunina
Electron. Mater. 2021, 2(3), 299-311; https://doi.org/10.3390/electronicmat2030021
Received: 30 April 2021 / Revised: 18 June 2021 / Accepted: 6 July 2021 / Published: 9 July 2021
(This article belongs to the Special Issue Electronic Processes in Ferroelectrics)
Currently, a large number of neurostimulators are commercially available for the treatment of drug-resistant diseases and as an alternative to pharmaceuticals. According to the current state of the art, such highly engineered electroceuticals require bulky battery units and necessitate the use of leads and extensions to connect the implantable electronic device to the stimulation electrodes. The battery life and the use of wired electrodes constrain the long-term use of such implantable systems. Furthermore, for therapeutic success and patient safety, it is of utmost importance to keep the stimulation current within a safe range. In this paper, we propose an implantable system design that consists of a low number of passive electronic components and does not require a battery. The stimulation parameters and power are transmitted inductively using an extracorporeal wearable transmitter at frequencies below 1 MHz. A simple circuit design approach is presented to achieve a closed-loop control of the stimulation current by exploiting the nonlinear properties of ferroelectric materials in ceramic capacitors. Twenty circuit topologies of series- and/or parallel-connected ceramic capacitors are investigated by measurement and are modeled in Mathcad. An approximately linear increase in the stimulation current, a stabilization of the stimulation current and an unstable state of the system were observed. In contrast to previous results, specific plateau ranges of the stimulation current can be set by the investigated circuit topologies. For further investigations, the consistency of the proposed model needs to be improved for higher induced voltage ranges. View Full-Text
Keywords: ferroelectric material; nonlinear capacitor; inductive coupling; implantable electronics; neurostimulation; electroceuticals; Mathcad ferroelectric material; nonlinear capacitor; inductive coupling; implantable electronics; neurostimulation; electroceuticals; Mathcad
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MDPI and ACS Style

Olsommer, Y.; Ihmig, F.R. Experimental Characterization of Ferroelectric Capacitor Circuits for the Realization of Simply Designed Electroceuticals. Electron. Mater. 2021, 2, 299-311. https://doi.org/10.3390/electronicmat2030021

AMA Style

Olsommer Y, Ihmig FR. Experimental Characterization of Ferroelectric Capacitor Circuits for the Realization of Simply Designed Electroceuticals. Electronic Materials. 2021; 2(3):299-311. https://doi.org/10.3390/electronicmat2030021

Chicago/Turabian Style

Olsommer, Yves, and Frank R. Ihmig 2021. "Experimental Characterization of Ferroelectric Capacitor Circuits for the Realization of Simply Designed Electroceuticals" Electronic Materials 2, no. 3: 299-311. https://doi.org/10.3390/electronicmat2030021

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