EP2529602A1 - Device and method for generating an electrical discharge in hollow bodies - Google Patents
Device and method for generating an electrical discharge in hollow bodiesInfo
- Publication number
- EP2529602A1 EP2529602A1 EP11705829A EP11705829A EP2529602A1 EP 2529602 A1 EP2529602 A1 EP 2529602A1 EP 11705829 A EP11705829 A EP 11705829A EP 11705829 A EP11705829 A EP 11705829A EP 2529602 A1 EP2529602 A1 EP 2529602A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- plasma
- generating
- tube
- electrodes
- hose
- 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.)
- Granted
Links
Classifications
-
- 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 uniform generation of a physical plasma in long and narrow lumen at the same time, flexible or rigid, dielectric hoses, pipes or other hollow bodies (hereinafter referred to as hoses) in the low, normal, or Overpressure area which is 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 purification, activation , Coating, modification and biological decontamination (sterilization, disinfection, sterilization) of the inner walls of these hoses and / or the process medium itself, as well as for therapeutic use by means of a dielectrically impeded barrier discharge or by means of the electrical gas discharge in the process medium therapeutic components.
- process medium for the purpose of purification, activation , Coating, modification and biological decontamination (sterilization, disinfection, sterilization) of the inner walls of these hoses and
- the device requires special internal electrodes
- the device requires special external electrodes
- the device does not work at normal pressure
- the device has high maintenance costs by e.g. high gas fins on
- the device is limited in the treatment route
- the device can not guarantee homogeneous treatment over the length of the tube
- the device is limited to noble gases, whereby the application is limited
- the device is not suitable for processing thermally labile materials
- the biological decontamination is carried out with aggressive media which leads to material damage
- 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.
- Another structure is realized via an inner electrode in the tube and an outer electrode below the tube. (Plasma Process, Polym., 2008, 5, 606-614)
- the physical plasma is therefore generated only between the electrodes and does not fill the entire volume of the tube. Furthermore, additional electrodes are needed in this structure, which limits the use of finished medical devices.
- a device is known with which a jetartges plasma outside a dielectric tube can be generated (Applied Physics Letters 2005, 87, 113902).
- plasma generation inside long tubes is not possible with this device.
- this device is unsuitable.
- a plasma is ignited inside glass tubes.
- a thin inner electrode is inserted into the tube.
- the counter electrode forms silver foil, which was attached outside the tube.
- a corona afterglow discharge is generated with nitrogen.
- the afterglow plasma is then passed into the tube at high flow rates, so that over some distance a plasma is present inside the tube.
- streamer are generated in liquids or in liquid-surrounded gas bubbles 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 known method for the treatment of liquids by means of electrical gas discharge is described in the patent DE 44 40 813 C2.
- 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 form of 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 Tested hoses can have an inside diameter of a few centimeters to less than 1 millimeter 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 ⁇ up to 5 mm.
- the electrodes may be present as wire with a diameter of preferably 10 ⁇ m 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 along.
- 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 fitting a 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, which can be generated on the outer wall of the tube, a physical plasma.
- hose dielectric body and / or dielectric liquid droplets such as glass beads and / or oil drops, but especially balls with a diameter greater than 100 ⁇ and smaller than the inner diameter of the hose, alone or together with the Process medium introduced.
- the device is very versatile, even in working and jet channels of complex medical devices, a physical plasma can be generated without any problems, without the structure of such devices must be changed greatly, or the function of components of the device is affected.
- the device offers the possibility to create a jet-like plasma at the gas outlet of the tubing for cleaning, activation, coating, modification and biological decontamination (disinfection, disinfection, sterilization) as well as for therapeutic applications.
- dielectric bodies for example gas bubbles
- the device includes a high voltage supply whose frequency range is in kilohertz up 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 ⁇ to mm and whose length can be varied from a few centimeters to several meters, and electrically conductive electrodes in the complete tube wall, which can be arbitrarily shaped and may have a diameter in the range of ⁇ up to several mm.
- FIGS. 1 and 2 show the basic structure of the device with two round, spirally wound electrodes around the inner tube (4), one of which is located at ground level. 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 shown in Fig. 3 and 4, as a network in which the electrodes are woven into a plastic mesh, or as shown in Fig. 5 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. 6 shows typical embodiments when more than 2 electrodes are used.
- Fig. 7 shows a further embodiment of the tube, was dispensed with a grounded electrode in the tube wall, instead, the electrical shield or kinking stiffener outside the tube is used as the ground electrode. As a result, a surface discharge is formed inside the tube.
- the shield is also incorporated in the tube wall with.
- Fig. 9 shows a further embodiment in which in the hose dielectric body and / or dielectric liquid droplets, such as glass beads and / or 01 drops, but especially spheres with a diameter greater than 100 ⁇ and smaller than the inner diameter of the Hose, alone or together with the process medium are introduced.
- the high voltage electrode is driven in all embodiments with a voltage in the kilovolt range and a frequency of a few kilohertz to megahertz with a sine, square or triangle signal.
- 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.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Apparatus For Disinfection Or Sterilisation (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP11705829.7A EP2529602B1 (en) | 2010-01-26 | 2011-01-26 | Device and method for generating an electrical discharge in hollow bodies |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/EP2010/050865 WO2011091842A1 (en) | 2010-01-26 | 2010-01-26 | Device and method for dry-cleaning, activating, coating, modifying, and biologically decontaminating the inner walls of hoses, pipes, and other hollow bodies |
DE102010003131 | 2010-03-22 | ||
EP11705829.7A EP2529602B1 (en) | 2010-01-26 | 2011-01-26 | Device and method for generating an electrical discharge in hollow bodies |
PCT/EP2011/051035 WO2011092186A1 (en) | 2010-01-26 | 2011-01-26 | Device and method for generating an electrical discharge in hollow bodies |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2529602A1 true EP2529602A1 (en) | 2012-12-05 |
EP2529602B1 EP2529602B1 (en) | 2014-11-05 |
Family
ID=47074460
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11705829.7A Not-in-force EP2529602B1 (en) | 2010-01-26 | 2011-01-26 | Device and method for generating an electrical discharge in hollow bodies |
Country Status (1)
Country | Link |
---|---|
EP (1) | EP2529602B1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104661422A (en) * | 2015-02-09 | 2015-05-27 | 大连民族学院 | Device for sterilizing and disinfecting surface of endoscope through plasma |
-
2011
- 2011-01-26 EP EP11705829.7A patent/EP2529602B1/en not_active Not-in-force
Non-Patent Citations (1)
Title |
---|
See references of WO2011092186A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP2529602B1 (en) | 2014-11-05 |
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