Webeco GmbH and Co. KG

Neustadt an der Weinstraße, Germany

Webeco GmbH and Co. KG

Neustadt an der Weinstraße, Germany

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Ehlbeck J.,Leibniz Institute for Plasma Science and Technology | Schnabel U.,Leibniz Institute for Plasma Science and Technology | Polak M.,Vanguard AG | Winter J.,Webeco GmbH and Co. KG | And 4 more authors.
Journal of Physics D: Applied Physics | Year: 2011

The aim of this paper is to provide a survey of plasma sources at atmospheric pressure used for microbicidal treatment. In order to consider the interdisciplinary character of this topic an introduction and definition of basic terms and procedures are given for plasma as well as for microbicidal issues. The list of plasma sources makes no claim to be complete, but to represent the main principles of plasma generation at atmospheric pressure and to give an example of their microbicidal efficiency. The interpretation of the microbicidal results remain difficult due to the non-standardized methods used by different authors and due to the fact that small variations in the setup can change the results dramatically. © 2011 IOP Publishing Ltd.


Polak M.,Vanguard AG | Winter J.,Webeco GmbH and Co. KG | Schnabel U.,Leibniz Institute for Plasma Science and Technology | Ehlbeck J.,Leibniz Institute for Plasma Science and Technology | Weltmann K.-D.,Leibniz Institute for Plasma Science and Technology
Plasma Processes and Polymers | Year: 2012

An innovative device capable of generating a cold atmospheric pressure plasma inside a 5 m long flexible tube with 2 mm inner diameter is presented. In order to analyze the inner-tube plasma, optical emission spectroscopy in the (vacuum) ultraviolet spectral range and Fourier transformed infrared spectroscopy were performed. By admixing small concentrations of nitrogen and oxygen to the standard argon gas flow rate of 1.5 slm, a drastically change in the plasma composition was observed. Additionally, it is possible to form a jet-like plasma at the end of the tube. The microbicidal efficacy of the inner-tube plasma and the jet-like plasma was shown for Bacillus atrophaeus spores. In this paper a setup is presented, to generate a DBD inside a long, flexible and thermo labile tube with the purpose to decontaminate the inner tube walls. The main application for these modified tubes is the implementation as biopsy channels in endoscopes, which are highly contaminated and difficult to sterilize. Besides decontamination of the inner tube it is also possible to ignite a jet-like discharge at the tube end. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Maucher T.,Fraunhofer Institute for Interfacial Engineering and Biotechnology | Schnabel U.,Leibniz Institute for Plasma Science and Technology | Volkwein W.,Fraunhofer Institute for Interfacial Engineering and Biotechnology | Kohnlein J.,HygCen GmbH | And 4 more authors.
Plasma Processes and Polymers | Year: 2011

Fine PTFE tubes are used in high-end and high cost devices like flexible Endoscopes where no standard sterilization procedure like autoclaving applies due to material properties. The study of innovative decontamination processes like plasma sterilization request appropriate analysis methods in order to verify the process functionality. In a related research project the IGB-cycle-method for contamination and recovery of indicator organisms like Bacillus atrophaeus spores was developed. It was possible to proof the IGB-cycle-method to be reproducible and reliable using round robin tests between three laboratories that compared their results in reference to a relevant level of contamination and recovery. Of a relevant contamination more than 7 log 10 steps of cfu/specimen could be recovered from the tube surface. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

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