EP2529602B1 - Dispositif et procédé pour produire une décharge électrique dans des corps creux - Google Patents

Dispositif et procédé pour produire une décharge électrique dans des corps creux Download PDF

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Publication number
EP2529602B1
EP2529602B1 EP11705829.7A EP11705829A EP2529602B1 EP 2529602 B1 EP2529602 B1 EP 2529602B1 EP 11705829 A EP11705829 A EP 11705829A EP 2529602 B1 EP2529602 B1 EP 2529602B1
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EP
European Patent Office
Prior art keywords
plasma
generation
hose
electrodes
tube
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP11705829.7A
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German (de)
English (en)
Other versions
EP2529602A1 (fr
Inventor
Joerg Ehlbeck
Klaus-Dieter Weltmann
Manfred Stieber
Joern Winter
Kim Winterweber
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Webeco Hygiene In Medizin und Labor GmbH&Co KG
Leibniz Institut fuer Plasmaforschung und Technologie eV
Xion GmbH
Original Assignee
Webeco Hygiene In Medizin und Labor GmbH&Co KG
Leibniz Institut fuer Plasmaforschung und Technologie eV
Xion GmbH
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Publication date
Priority claimed from PCT/EP2010/050865 external-priority patent/WO2011091842A1/fr
Application filed by Webeco Hygiene In Medizin und Labor GmbH&Co KG, Leibniz Institut fuer Plasmaforschung und Technologie eV, Xion GmbH filed Critical Webeco Hygiene In Medizin und Labor GmbH&Co KG
Priority to EP11705829.7A priority Critical patent/EP2529602B1/fr
Priority claimed from PCT/EP2011/051035 external-priority patent/WO2011092186A1/fr
Publication of EP2529602A1 publication Critical patent/EP2529602A1/fr
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H1/00—Generating plasma; Handling plasma
    • H05H1/24—Generating plasma
    • H05H1/2406—Generating plasma using dielectric barrier discharges, i.e. with a dielectric interposed between the electrodes
    • H05H1/2439—Surface discharges, e.g. air flow control
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H2245/00—Applications of plasma devices
    • H05H2245/30—Medical applications

Definitions

  • the invention relates to a device and a method for the uniform production of a physical plasma in long and narrow lumen, flexible or rigid, dielectric hoses, pipes or other hollow bodies (hereinafter referred to as hoses) in the low, normal, or overpressure area, the partially or completely filled or flushed with gas or gas mixtures, one or more liquids, gas-bubble-containing liquids, liquid-gas mixtures, aerosols and / or foam (hereinafter referred to as process medium), for the purpose of cleaning, activation, coating, modification and biological decontamination (sterilization, disinfection, sterilization) of the inner walls of these tubes and / or the process medium itself, and for the purpose of therapeutic use by means of a dielectrically impeded barrier discharge or by means of the resulting by the electrical gas discharge in the process medium therapeutical components.
  • process medium for the purpose of cleaning, activation, coating, modification and biological decontamination (sterilization, disinfection, sterilization) of the inner walls of these tubes and / or the process medium
  • Another method introduces a short needle into the tube, creating a jet-like plasma. By a high gas flow, the plasma can then be driven over a certain distance in the hose. ( Phys. Plasmas 14, 074502 (2007 )) However, in this method, the homogeneity of the plasma over the entire length of the hose is not guaranteed. Furthermore, you also have to work with an additional inner electrode.
  • a method is known in which the tube is guided into a process chamber, wherein a part of the process chamber is under vacuum. 2 electrodes outside the tube generate the electric field inside to generate the plasma. ( EP 0 348 690 A2 ). However, partial vacuum is used in this structure. Furthermore, the process chamber is only suitable for the treatment of uninstalled hoses.
  • a device for dry biological decontamination of inner walls of pipes and other hollow bodies by means of an atmospheric pressure plasma generated by a dielectrically impeded barrier discharge in a flowing gas atmosphere comprising a conductive grounded electrode and an electrically conductive high voltage electrode in the wall of the hose parallel in the axial direction (EP 1 933 605 A1 ).
  • the disadvantage of this device lies in the parallel, axial arrangement of the electrodes, whereby, on the one hand, an inhomogeneous plasma formation within the hollow body is caused and, on the other hand, in the case of a bending of the tube, tensile and shear forces on the electrodes which damage the material occur.
  • the last point makes the implementation of the device described in arrangements in which the maintenance of the flexibility is absolutely necessary (eg endoscope channels) impossible.
  • at least one heating element is helically embedded in a polymer layer.
  • the purpose of the device is to heat up gaseous or liquid media within the tube.
  • the structure shown is not used to generate an electrical discharge.
  • a device is known with which a jetartges plasma can be generated outside a dielectric tube ( Applied Physics Letters 2005, 87, 113902 ).
  • plasma generation inside long tubes is not possible with this device.
  • this device is unsuitable for applications that require both plasma generation methods in one device (plasma in the tube and jet-like plasma at the tube exit).
  • streamer are generated in a liquid or even in gas bubbles surrounded by liquid with a pin-to-plate arrangement. These streamer develop very high temperatures at the foot and are only very limited spatially extended. A coating or decontamination inside thermolabile and narrow lumen is therefore not possible.
  • a device for generating plane pressure waves in liquid-filled tubes by means of plasma for the purpose of cleaning ( DE 23 25 517 ).
  • the plasma is used exclusively for pressure wave generation, so that liquids can not be decontaminated even by means of plasma with the device described.
  • the device does not guarantee the plasma formation over the entire hose length.
  • a known method for the treatment of liquids by means of electrical gas discharge is in the patent DE 44 40 813 C2 described.
  • the cleaning of the liquid takes place in a partially filled with liquid vessel under atmospheric pressure by generating a dielectrically impeded gas discharge in the form of microplasmas in the gas space between the electrode and liquid.
  • the generation of a dielectrically impeded barrier discharge in completely filled with liquid, liquid-gas mixtures, aerosols or foam long narrow hollow bodies is not the subject of the described method. However, this is useful, for example, for the cleaning of narrow long lumens.
  • the specified method does not claim to clean, activate, coat, modify and biological decontamination (sterilization, disinfection, sterilization) of the inner walls of hoses.
  • the patent DE601 03 997T2 ( EP 1 276 697 B1 ) relates to a method for fixing a first fluid in a second fluid using a corona discharge generated by means of very high DC voltages in the range of 50 kV.
  • Another device operates with a large plasma chamber, on the wall of a liquid film is applied, which then by means of a sheet charge is plasma treated. To ignite this arc charge a high power is required, which at the same time creates a very high temperature of the arc. For the treatment of thermolabile products this discharge is excluded. Furthermore, the structure of the device is unsuitable for the above purpose.
  • the object of the present invention is to overcome the disadvantages of the technical solutions described above.
  • the structure of the hoses has been changed so that no additional electrodes outside and inside the hoses are more needed to produce a homogeneous over the entire length of the hoses physical plasma, without causing changes in physical, chemical or mechanical properties, as well the functionality of the hoses occur.
  • the device represents, in particular, a simple and cost-effective change in the construction of such tubes. At the same time, this results in only minor changes for finished medical products containing such tubes.
  • the invention ensures the simplest possible generation of physical plasmas in the tubes in complex medical devices, so that disassembly of the devices or other special devices are not needed.
  • the tube walls are provided with a plurality of spirally and preferably equidistantly around the tube extending metallic conductors (hereinafter referred to as electrodes), wherein the electrodes are located within the tube wall.
  • electrodes metallic conductors
  • the electrodes are wound onto an inner tube, fixed with special adhesives, after which an outer tube is shrunk.
  • Other possibilities include the embedding of the electrodes in a single tube or in the application of electrical conductors by special etching or coating processes.
  • the so produced Hoses can have an inside diameter of a few cm down to 1 mm and smaller and a length of several meters.
  • the material of the electrodes must necessarily be electrically conductive, wherein the material of the inner or outer tube must have dielectric properties and preferably has a thickness of 10 microns to 5 mm.
  • the electrodes may be present as a wire with a diameter of preferably 10 ⁇ m up to 2 mm.
  • other cross-sectional geometries can be used (eg rectangular wire cross sections with a thickness of typically 10 ⁇ m to 500 ⁇ m and a width of preferably 0.1 mm to 2 mm).
  • the distance between the electrodes and the insulating material located therebetween must be chosen so that when a high voltage is applied, the resulting field strength between the electrodes is less than the dielectric strength of the insulating material.
  • the number of electrodes is greater than or equal to 2, with each second electrode preferably being at the same potential. Adjacent electrodes are controlled separately, so that one of the electrodes is at ground potential and the adjacent electrode is driven with an alternating voltage, preferably in the kHz range. According to the invention, an electrical field is generated by the structure between the electrodes and a physical plasma is generated when the ignition field strength is exceeded.
  • different discharge modes can be generated. Thus, volume and surface discharge as well as filamentous and diffuse discharge modes, depending on the task are adjustable.
  • the electrodes are pulled axially in the tube wall.
  • Another embodiment of this device can be realized via a braid inside the tube wall.
  • the braid consists of non-conductive material, which is typically also used in the construction of such tubes for example endoscopes. In this braid then continuously and preferably equidistant electrical conductors are woven, which then extend over the entire length of the hose.
  • the electrodes are introduced into the tube wall and externally wound around the tube a precise wire mesh.
  • the electrodes inside the wall are driven with the AC voltage, while the Grid is at ground potential. This forms a surface discharge inside the hose.
  • the process medium is not introduced into the interior of the tube, but applied externally, whereby a physical plasma can be generated on the outer wall of the tube.
  • dielectric bodies and / or dielectric liquid drops such as, for example, glass beads and / or oil drops, but in particular balls with a diameter greater than 100 ⁇ m and smaller than the inner diameter of the hose, are introduced into the hose alone or together with the process medium.
  • the device includes a high voltage supply whose frequency range is in kilohertz to megahertz and provides the voltage required to generate the atmospheric pressure discharge in the range of 1-25 kV, a dielectric tube whose diameter is preferably in the range of ⁇ m to mm and its length of can be varied from a few centimeters to several meters, and electrically conductive electrodes in the entire tube wall, which can be of any desired shape and can have a diameter in the range of ⁇ m up to several mm.
  • Fig. 1 and Fig. 2 show the basic structure of the device with 2 round, spirally around the inner tube (4) rotated electrodes, one of them to ground potential (1), the other (2) to an AC voltage.
  • the gas supply (7) via a gas connection with a gas nozzle.
  • the electrodes can be present in different arrangements and number, as in Fig. 3 and 4 shown as a network in which the electrodes are woven into a plastic mesh, or as in Fig. 5 shown as parallel wires in the axial direction. The number of electrodes is variable.
  • Inner and outer hose are identical in all arrangements and serve as a dielectric.
  • Fig. 7 shows a further embodiment of the tube, has been dispensed with a grounded electrode in the tube wall, instead, the electrical shield or kinking stiffening outside the tube is used as a ground electrode. As a result, a surface discharge is formed inside the tube.
  • the shield is also built into the hose wall.
  • Fig. 9 shows a further embodiment in which in the hose dielectric body and / or dielectric liquid droplets, such as glass beads and / or oil drops, but especially spheres with a diameter greater than 100 microns and smaller than the inner diameter of the tube, alone or together with the process medium be introduced.
  • a dielectric liquid droplets such as glass beads and / or oil drops
  • the high voltage electrode is driven in all embodiments with a voltage in the kilovolt range and a frequency of a few kilohertz up to megahertz with a sine, square or triangle signal.
  • a voltage in the kilovolt range and a frequency of a few kilohertz up to megahertz with a sine, square or triangle signal In this case, the most different duty cycles and edge steepnesses can be used, with special pulse or burst voltages for some processes can represent a particular advantage.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Apparatus For Disinfection Or Sterilisation (AREA)

Claims (15)

  1. Dispositif pour la génération d'un plasma physique à l'intérieur des tuyaux longs diélectriques avec un diamètre intérieur faible comportant:
    au moins une électrode à haute tension électriquement conductrice (3) et une électrode mise à la terre électriquement conductrice (2) ainsi une alimentation haute tension (6) et une unité d'alimentation pour les milieux de processus (7), caractérisé en ce que les deux électrodes sont introduites dans la paroi de tuyau.
  2. Dispositif selon la revendication 1, caractérisé en ce que les électrodes
    a) s'entendent en forme d'hélice le long de l'axe du tuyau ou
    b) parallèlement dans le sens axial ou
    c) sont introduites en tant que réseau ensemble avec des fibres non conductrices.
  3. Dispositif selon la revendication 1 ou 2, caractérisé en ce que les électrodes sont agencées dans la paroi du tuyau diélectrique et une grille électriquement conductrice est agencée à l'extérieur faite sur mesure autour le tube.
  4. Dispositif selon l'une quelconque des revendications 1 à 3, caractérisé en ce que dans le tuyau sont agencés des corps diélectriques et/ou des gouttes de liquide diélectriques, de préférence des billes de verre et/ou des gouttes d'huile, mais surtout des billes avec un diamètre supérieur à 100 µm et inférieur au diamètre intérieur du tuyau, seuls ou ensemble avec le milieu de processus.
  5. Dispositif selon la revendication 1 à 4, caractérisé en ce qu'il comprend des moyens pour la génération d'un plasma comme un jet à l'extrémité du tuyau.
  6. Dispositif pour la génération d'un plasma à l'intérieur des tuyaux longs diélectriques avec un diamètre intérieur faible, caractérisé en ce que par les étapes suivantes:
    ⇒ fixation des électrodes à cette fin à un tuyau interne, de préférence avec des colles, sur lesquelles ensuite un tuyau externe s'est rétréci ou application des électrodes par des procédés spéciaux de mordançage ou de revêtement ou incorporation des électrodes directement dans la paroi de tuyau.
    ⇒ addition d'un milieu de processus dans le tuyau et application d'une haute tension alternée, un plasma physique étant généré dans le milieu de processus lors du dépassement de l'intensité du champ d'allumage.
  7. Procédé pour la génération d'un plasma selon la revendication 6, caractérisé en ce qu'un signal rectangulaire avec une pente du signal de typiquement 1kV/ns est utilisé pour la génération de la haute tension.
  8. Procédé pour la génération d'un plasma selon l'une quelconque des revendications précédentes 6 ou 7, caractérisé en ce que la haute tension est appliquée en mode rafale.
  9. Procédé pour la génération d'un plasma selon l'une quelconque des revendications 6 à 8, caractérisé en ce que le milieu de processus et l'effet de plasma sont appliqués sur la surface externe du tuyau.
  10. Procédé pour la génération d'un plasma selon l'une quelconque des revendications 6 à 9, caractérisé en ce que l'étape de la génération du plasma comprend l'introduction des corps diélectriques et/ou des gouttes de liquide diélectriques comme par exemple des billes de verre et/ou des gouttes d'huile, mais surtout des billes avec un diamètre supérieur à 100 µm et inférieur au diamètre intérieur du tuyau, seuls ou ensemble avec le milieu de processus dans le tuyau.
  11. Procédé pour la génération d'un plasma selon l'une quelconque des revendications 6 à 10, caractérisé en ce que le plasma généré dans le lumen peut être extrait du lumen par un flux de gaz et/ou un potentiel virtuel de mis à la terre et peut être utilisé en tant qu'outil de traitement et pour des usages thérapeutiques.
  12. Procédé pour la génération d'un plasma selon l'une quelconque des revendications 6 à 10, caractérisé en ce que l'étape de génération du plasma comprend le nettoyage ou la modification de surface de la paroi du tuyau
    et/ou
    le nettoyage ou la modification de surface du milieu de processus.
  13. Procédé pour la génération d'un plasma selon l'une quelconque des revendications précédentes 6 à 10, caractérisé en ce que l'étape de génération du plasma comprend le revêtement de la paroi du tuyau ou le revêtement des corps solides alimentés au milieu de processus.
  14. Procédé pour la génération d'un plasma selon l'une quelconque des revendications 6 à 10, caractérisé en ce que l'étape de génération du plasma comprend la décontamination biologique (dégermination, désinfection, stérilisation) de la paroi du tuyau ou du milieu de processus.
  15. Procédé pour la génération d'un plasma selon l'une quelconque des revendications 6 à 10, caractérisé en ce que l'étape de génération du plasma comprend la génération d'un plasma comme un jet à l'extrémité du tuyau.
EP11705829.7A 2010-01-26 2011-01-26 Dispositif et procédé pour produire une décharge électrique dans des corps creux Not-in-force EP2529602B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP11705829.7A EP2529602B1 (fr) 2010-01-26 2011-01-26 Dispositif et procédé pour produire une décharge électrique dans des corps creux

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
PCT/EP2010/050865 WO2011091842A1 (fr) 2010-01-26 2010-01-26 Dispositif et procédé pour le nettoyage à sec, l'activation, le revêtement, la modification et la décontamination biologique des parois intérieures de tuyaux, de tubes et d'autres corps creux
DE102010003131 2010-03-22
EP11705829.7A EP2529602B1 (fr) 2010-01-26 2011-01-26 Dispositif et procédé pour produire une décharge électrique dans des corps creux
PCT/EP2011/051035 WO2011092186A1 (fr) 2010-01-26 2011-01-26 Dispositif et procédé pour produire une décharge électrique dans des corps creux

Publications (2)

Publication Number Publication Date
EP2529602A1 EP2529602A1 (fr) 2012-12-05
EP2529602B1 true EP2529602B1 (fr) 2014-11-05

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EP11705829.7A Not-in-force EP2529602B1 (fr) 2010-01-26 2011-01-26 Dispositif et procédé pour produire une décharge électrique dans des corps creux

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104661422A (zh) * 2015-02-09 2015-05-27 大连民族学院 一种等离子体对窥镜表面消毒杀菌的装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104661422A (zh) * 2015-02-09 2015-05-27 大连民族学院 一种等离子体对窥镜表面消毒杀菌的装置

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