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  4. Experimental characterization of ferroelectric capacitor circuits for the realization of simply designed electroceuticals
 
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2021
Journal Article
Title

Experimental characterization of ferroelectric capacitor circuits for the realization of simply designed electroceuticals

Abstract
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.
Author(s)
Olsommer, Yves  
Fraunhofer-Institut für Biomedizinische Technik IBMT  
Ihmig, Frank  orcid-logo
Fraunhofer-Institut für Biomedizinische Technik IBMT  
Journal
Electronic materials  
Open Access
File(s)
Download (2.41 MB)
Rights
CC BY 4.0: Creative Commons Attribution
DOI
10.24406/publica-r-269179
10.3390/electronicmat2030021
Language
English
Fraunhofer-Institut für Biomedizinische Technik IBMT  
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