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Current Directions in Biomedical Engineering

Joint Journal of the German Society for Biomedical Engineering in VDE and the Austrian and Swiss Societies for Biomedical Engineering

Editor-in-Chief: Dössel, Olaf

Editorial Board: Augat, Peter / Buzug, Thorsten M. / Haueisen, Jens / Jockenhoevel, Stefan / Knaup-Gregori, Petra / Kraft, Marc / Lenarz, Thomas / Leonhardt, Steffen / Malberg, Hagen / Penzel, Thomas / Plank, Gernot / Radermacher, Klaus M. / Schkommodau, Erik / Stieglitz, Thomas / Urban, Gerald A.

CiteScore 2018: 0.47

Source Normalized Impact per Paper (SNIP) 2018: 0.377

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Electrophoretic deposition of dielectric film on stimulation electrodes for the use in intraoperative neuromonitoring

Karin J. Chen / Johanna Oswald / Thilo Krüger
Published Online: 2018-09-22 | DOI: https://doi.org/10.1515/cdbme-2018-0125


Electrophoretic deposition (EPD) is a material processing technology which uses direct current (DC) voltage to deposit thin layers on a metallic substrate. EPD is a promising coating technology for medical devices due to its advantages such as thin homogenous layers and a broad range of usable substrates. The objective of this paper is to demonstrate how EPD can be deployed successfully to apply an insulation layer on a stimulation electrode. The Mapping suction probe by inomed Medizintechnik GmbH, Germany, was coated in this investigation. The unique feature of this product is that it combines both a surgical vacuum and a stimulation probe and is used for brain tumour resection. As for the insulation layer, ethylene chlorotrifluoroethylene (ECTFE) was chosen because of its good dielectric and biocompatible properties. ECTFE particles (Halar®6514, Solvay Specialty Polymer, Italy) were mixed with a solvent (Novec™ 7100DL Engineered Fluid, 3M™) to form a suspension. The coating process was partly automatized to ensure good repeatability and reproducibility. For coating, the stimulation probe was immersed in the suspension so that the counter electrode, a stainless-steel net, surrounded it equidistantly. A heat treatment of the coated device in an oven (FED56, Binder, Germany) was required afterwards to melt the deposited polymer particles. After the heat treatment, a glossy black layer (layer thickness 42 μm) was observed on the substrate. A smooth and homogenous surface confirmed that the coating is suitable for surgical application. However, due to a high evaporation rate of the solvent, the ratio of particles and solvent changes and the coating process will have to be controlled in the future to achieve a stable process. Further advantages of EPD such as short processing time, straightforward process flow and scalability enables high production quantities which is attractive for industrial application. EPD might be a promising coating technology for medical devices in the future.

Keywords: electrophoretic deposition; insulation layer; thin film; medical device; stimulation electrode

About the article

Published Online: 2018-09-22

Published in Print: 2018-09-01

Citation Information: Current Directions in Biomedical Engineering, Volume 4, Issue 1, Pages 521–524, ISSN (Online) 2364-5504, DOI: https://doi.org/10.1515/cdbme-2018-0125.

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