Nozzle for generation of an atmospheric pressure plasma

Description

1 / 17 Nozzle for generating atmospheric pressure plasma.

[0001] The present description refers to a nozzle for generating an atmospheric pressure plasma having a monopolar electrode. State of the art

[0002] Nozzles for generating atmospheric pressure plasma are known in the art. Said nozzles can be used in conjunction with devices for providing a gas as well as a pulsed voltage in order to generate atmospheric pressure plasma. Non-thermal atmospheric pressure plasma can be used in medical devices for the treatment of the human body. Medical devices generally comprise a handle where the plasma is generated and a nozzle where the plasma exits the device. In order to satisfy hygiene requirements for medical devices, the nozzle can be replaced and can be restricted to single use. An electrode arrangement for a plasma jet device as well as a plasma head having such an electrode arrangement is known from WO 2022 / 013 229 A1. The electrode arrangement comprises printed circuit boards with conduction paths.

[0003] The design of the device and particularly the nozzle may satisfy different requirements depending on the field of application and the surface to be treated. A device and nozzle for treating large surface areas such as skin treatment may differ from a nozzle for invasive subcutaneous treatment.

[0004] The first objective of the present invention is to provide a nozzle for the treatment of body structures, in particular bone structures or artificial bone structures, that are not exposed and / or not freely accessible. Petition 870250094704, dated 10 / 16 / 2025, page 22 / 48 2 / 17 accessible. An additional aspect is the provision of plasma generation close to the structure being treated, minimizing losses and also minimizing the treatment of neighboring structures. Summary

[0005] In one example, a nozzle for atmospheric pressure plasma generation has a monopolar electrode. The nozzle comprises a blade nozzle with an upper blade and a lower blade between which a gas channel is formed. An outlet is formed in the upper blade and the electrode is exposed in the outlet area.

[0006] The blade nozzle may be of a sandwich design, in which a gas channel is arranged between an upper blade and a lower blade. The electrode may also be arranged between the upper and lower blades. In one embodiment, the electrode may be attached to the lower blade. The gas channel outlet may be formed as a recess or opening in the upper blade. The shape of the outlet, for example, may be circular, elliptical, arc-shaped, or polygonal, as well as combinations thereof, or may have any other shape. The electrode is exposed or bare in the area of ​​the outlet. This may include the electrode being particularly exposed in the area of ​​a projection of the outlet shape onto the lower blade. Such an arrangement promotes plasma generation at or near the outlet, through which it exits the blade nozzle.

[0007] The nozzle comprises, in one embodiment, a V-shaped recess formed at one tip of the blade nozzle. The V-shaped recess may include any recess formed into the central area of ​​a basically flat or straight tip, particularly tail shapes. Petition 870250094704, dated 10 / 16 / 2025, page 23 / 48 3 / 17 dovetail, curved shapes or similar. The recess may extend over at least part of the tip, preferably over a central part of the tip. In one embodiment, the V-shaped recess may extend basically over the entire width of the tip. The V-shaped tip particularly facilitates the treatment of bone or implant structures such as the treatment of peri-implantitis in a metal dental implant, for which the blade nozzle needs to be inserted between the implant and the gingiva and in gingival pockets, respectively. The V-shaped tip facilitates insertion and movement into the pocket by reducing adhesion-slip phenomena, especially along the implant screw thread. Additionally, the V-shape promotes the application of the blade nozzle to a spherical surface of the implant by the nozzle being aligned to said surface.Similar effects can be achieved when other body structures such as bone, teeth, or implants / prostheses are treated. An example for prostheses could be hip or knee joint prostheses that are treated with plasma after implantation to remove bacteria.

[0008] In one embodiment, the blade nozzle can be flexibly bent in a direction orthogonal to the upper and lower blade surfaces. The upper and lower blades are arranged basically parallel with respect to their flattest extent. The flatter blade design, together with a well-limited gas channel height, allows for bendability through a force orthogonal to the upper and lower blades. The blade nozzle can Petition 870250094704, dated 10 / 16 / 2025, p. 24 / 48 4 / 17 can be curved around an axis orthogonally to the longitudinal extension of the blade nozzle, the longitudinal extension of which may be aligned with the flow direction in the gas channel or around an axis aligned with the longitudinal extension of the blade nozzle. The ability to curve around the orthogonal axis may facilitate insertion into flat openings such as gingival pockets, and the ability to curve around the longitudinal axis allows alignment with elliptical or circular surfaces. The height of the blade nozzle from the lower blade to the upper blade may be smaller compared to the width of the blade nozzle from one longitudinal side to the opposite longitudinal side. The width / height ratio may be in the range of 2 to 10, preferably in the range of 2 to 5.Additionally, the length of the free, upright portion of the blade nozzle extending from the connector to the tip may be greater than its width. The length / width ratio may be in the range of 2 to 10, preferably in the range of 2 to 5.

[0009] The blade nozzle, in one example, may have multiple outlets. The gas outlets may be located on the upper blade or, if a spacer is arranged between the upper and lower blades, the outlets may also extend from the upper blade to the spacer or may be projected as side outlets on the spacer. The outlets may all have the same shape or may have different shapes. The gas outlets may be arranged in an irregular pattern or a regular pattern, in particular in a symmetrical dot pattern or Petition 870250094704, dated 10 / 16 / 2025, p. 25 / 48 5 / 17 line. The symmetrical axis can extend along the width or length of the blade nozzle.

[00010] In one embodiment, each of the outputs has a corresponding monopolar electrode member. The arrangement of one electrode member for each output allows for sizing of each electrode according to the requirements at the corresponding output. In one embodiment, each of the electrode members can be contacted separately in order to control each electrode member separately. The control includes, in particular, the application of an individual voltage to each of the electrode members which can vary with time, for example a pulsed voltage. In this case, each of the electrode members can be considered as a separate electrode. However, in the case of multiple electrodes, the nozzle can be designed such that it comprises only monopolar electrodes and the opposite electrode is applied to the object to be treated.

[00011] In an alternative embodiment, the multiple electrode members are designed as forks or branches of a single electrode. In a further alternative, the blade nozzle comprises only a single electrode that is bare in the area of ​​multiple outlets or has multiple uncovered areas for each outlet.

[00012] In one embodiment, the upper blade and the lower blade are connected to each other or are joined at their lateral end portions and at their tip portion. A circumferential connection on three sides is provided, forming a gas channel between the upper blade and the lower blade. The cross-sectional shape of the blade nozzle can be basically elliptical or arc-shaped with Petition 870250094704, dated 10 / 16 / 2025, page 26 / 48 6 / 17 connection points at its main vertices. The elliptical shape can be achieved by a corresponding support of the blade sheets in a connector to connect the nozzle with the plasma generation device.

[00013] In an alternative embodiment, the connection between the upper blade and the lower blade is formed by a spacer that forms a side wall of the blade nozzle. The spacer can be arranged on at least three sides of the blade nozzle, in particular on two side portions as well as on the tip portion. This allows for a basically rectangular cross-section of the blade nozzle as well as the gas channel. A rectangular cross-section with a greater width than height allows for a bending capability as described above.

[00014] In one embodiment, at least one of the top blade, bottom blade, and side wall is made of a flexible PCB material, preferably polyamide or FR4. A flexible PCB material is a material used for printed circuit boards (PCBs). The top blade and bottom blade can be made of a sheet-like flexible PCB material. The use of a PCB material can have, particularly for the bottom blade, synergistic effects when the bottom blade is used as a carrier for the electrode. The electrode can be applied as a conductive rail in the PCB material.

[00015] The electrode, and in particular the conductive rail, in one embodiment, may be made of copper, preferably copper with a gold coating. In alternative embodiments, the electrode may be made of any conductive material. Petition 870250094704, dated 10 / 16 / 2025, page 27 / 48 7 / 17

[00016] In one embodiment, the electrode can be formed as a conductive rail on the lower blade, particularly on the inner surface of the lower blade. The PCB with the conductive rail can be formed in a manner known in the art. The PCB can comprise multiple conductive rails, for example, providing a conductive rail for each gas outlet. The PCB can be made of an electrically insulating material. When the conductive rail is formed on the inner surface of the lower blade, the conductive rail can extend into the gas channel located between the lower blade and the upper blade.

[00017] In order to prevent the spacer from overheating beyond a critical temperature and causing deformation of the spacer, in one embodiment, the electrode is spaced from the spacer. The electrode in particular may be spaced from the side wall and, if applicable, from the spacer. The gap between the spacer and the electrode may be provided by a groove in the bottom blade or PCB, respectively. The groove may be formed by removing the conductive layer during the production of the conductive rail and / or by removing parts of the PCB material.

[00018] In one embodiment, the electrode may be partially coated with a varnish that serves as an insulator. The coating of the electrode with an insulator may be such that the electrode is covered in the gas channel and is uncovered only in the gas outlet area. Such an arrangement prevents unwanted ignition of the gas during nozzle operation and plasma generation within the gas channel. The electrode may also be coated with an insulator other than a varnish. Alternatively, the electrode Petition 870250094704, dated 10 / 16 / 2025, p. 28 / 48 8 / 17 can run inside the blade or spacer, or it can be encased in a sandwich arrangement of the lower blade or the lower blade and spacer.

[00019] In one embodiment, the nozzle comprises a connector at the base of the blade nozzle. The connector is adapted to connect the nozzle to a device or a handle of a device for plasma generation. The connector may provide a gas inlet and an electrical connector. The electrical connector may provide an electrical connection to a power source for providing a voltage or modulating a voltage at the electrodes. The power source may be, in particular, a pulsed voltage source. The base of the blade nozzle is arranged on the opposite side of the tip portion.

[00020] The connector, in one embodiment, may be of molded plastic. During production, the blade nozzle is inserted into a mold and the base of the blade nozzle is overmolded with a plastic material.

[00021] Preferred embodiments of the present invention are described by way of example with reference only to the accompanying drawings, in which:

[00022] Figure 1 illustrates an example of a nozzle for generating an atmospheric pressure plasma.

[00023] Figure 2 is an illustration of the blade nozzle of Figure 1.

[00024] Figure 3 is a cross-section of the blade nozzle of Figure 2, taken from line AA.

[00025] Figure 3a is a detailed view of the cross-section of Figure 3, taken from circle B.

[00026] Figures 4a to 4c are a second embodiment of a blade nozzle in different views. Petition 870250094704, dated 10 / 16 / 2025, page 29 / 48 9 / 17

[00027] Figures 5a and 5b are a third embodiment of a blade nozzle in different views.

[00028] The present description is directed to a nozzle for the generation of an atmospheric pressure plasma. An example of a nozzle 1, as shown in Figure 1, may comprise a blade nozzle 10 and a connector 20. The blade nozzle 10 comprises a monopolar electrode 11. The blade nozzle 10 may be of an elongated form in which the connector 20 may be located on or around one end of the elongated blade nozzle 10. The electrode 11 is adapted to be connected to a power source, preferably through or within the connector 20, for the generation of an atmospheric pressure plasma by igniting a gas. The blade nozzle 10 further comprises a gas channel 16 for directing a gas to a tip 19 of the electrode 11. The blade nozzle 10 comprises a recess 14 as a gas outlet, which may be located in the area of ​​the tip of the electrode 19.

[00029] The blade nozzle 10 may be of elongated flat shape with a lower blade 12 and an upper blade 13. Between the lower blade 12 and the upper blade 13 the gas channel 16 as well as the electrode 11 may be arranged wherein the lower blade 12 may serve as a carrier for the electrode 11. The blade may be of a flexible material for printed circuit boards (PCBs), preferably polyamide or FR4. The tip 17 of the blade nozzle 10, which may be at the opposite end to the connector 20, may have a recess in the shape of a V, resulting in a V-shaped tip.

[00030] The basic design of blade nozzle 10 is a plan such that blade nozzle 10 can be curved when Petition 870250094704, dated 10 / 16 / 2025, pp. 30 / 48 10 / 17 an orthogonal force with the lower and upper blades 12, 13 is applied while it is relatively rigid when an orthogonal force with the side wall is applied. Such a design that can be curved or flexible is achieved primarily by the use of a blade material that can be curved / flexible as well as by the dimensions of the blade nozzle 10 having a flat design. The width of the blade nozzle 10 from one side wall to the opposite side wall is multiple times the height from the lower blade 12 to the upper blade 13.

[00031] In one embodiment, the lower blade 12 may have a thickness of about 45 µm and the upper blade 13 of 127 µm. The free upright part of the blade nozzle 10 may have dimensions of 10 mm in length and 2 mm in width resulting in a length / width ratio of 5. The height or thickness of the nozzle 1 may be 300 µm resulting in a width / height ratio of 6.7. The spacer 15 between the lower blade and the upper blade 12, 13 may have a width of 300 µm and a height or thickness of 125 µm. The electrode 11 attached with the rear blade 12 may have a thickness of 35 µm and a width of 500 µm.

[00032] Connector 20 is adapted to connect nozzle 1 to a handle or the base of a device for generating atmospheric pressure plasma (not shown). Two basic functions can be implemented in connector 20 besides contacting nozzle 1 with the handle or device. One function is to implement an electrical connection between electrode 11 and electrical connectors of the device not shown. Therefore, electrode 11 can be positioned in connector 20 such that an electrical connection can be made. Petition 870250094704, dated 10 / 16 / 2025, page 31 / 48 11 / 17 established. A second function is directing gas from a gas source (not shown) to gas channel 16. The gas can be supplied through the handle and / or the device for plasma generation. Therefore, connector 20 can be designed such that a gas-tight connection from the source to nozzle 1 can be established.

[00033] Additionally, the connector 20 or at least parts thereof may be designed in a rotationally symmetric manner such that the nozzle 1 may be rotated about its longitudinal axis R, which extends along the elongated shape of the nozzle 1 / blade nozzle 10. The connector 20 may comprise a profiled surface 22 for the rotation of the nozzle 1 about its rotating axis R. The profiled surface 22 may be arranged on the circumferential surface of a disc. The surface 22 may be designed in the manner of a serrated nut.

[00034] Figure 1 shows a nozzle 1 with a blade nozzle 10 and a connector 20. A more detailed view of the blade nozzle 10 is shown in Figures 2, 3 and 3a. The blade nozzle 10 comprises a lower blade 12. The lower blade 12 is composed of a PCB material and serves as a carrier for the electrode 11. The lower blade 12 may consist of polyamide or FR4. The blade nozzle 10 further comprises an upper blade 13. The lower blade 12 and the upper blade 13 are arranged in the segment extending from the connector 20, essentially congruent with respect to their outer shape. At the opposite end from the connector 20, the tip of the blade nozzle 10 has a V-shaped recess that forms a V-shaped tip 17. Between the lower blade 12 and the upper blade 13 is a spacer 15, arranged such that Petition 870250094704, dated 10 / 16 / 2025, pp. 32 / 48 12 / 17 that the lower blade and the upper blade 12, 13 are spaced apart from each other. The upper blade and the lower blade 13, 12 are basically parallel to each other. The spacer 15 may be arranged on the longitudinal sides of the blade nozzle 10, which may extend along the longitudinal axis R, and on the V-shaped tip 17 such that the volume between the two blades 12, 13 is enclosed and sealed. The spacer 15 may be considered as a side wall and front face of the blade nozzle 10. In conjunction with the description of the nozzle, all surfaces or sections facing or located in the tip area 17 are referred to as front surfaces or front or tip sections and the surfaces or sections facing or located near the opposite end of the nozzle 1 are referred to as rear surfaces or rear sections. Spacer 15 may consist of the same material as the lower and upper blades 12, 13.

[00035] The chamber confined between the lower and upper blades 12, 13 and the spacer 15 is designed as a gas channel 16. The gas current can be directed from a gas inlet 14' inside the connector 20 to a gas outlet 14 adjacent to the tip 17 of the blade nozzle 10. The gas outlet 14 can be designed as a recess in the upper blade 13. The recess 14 can be arranged in such a way above the electrode tip 19 that the tip 19 is opposite the gas outlet 14.

[00036] Connector 20 surrounds one end of blade nozzle 10 opposite tip 17. Connector 20 has a basically rotationally symmetrical external shape so as to be rotatably contactable with a base or handle. Connector 20 comprises two conical sections. Petition 870250094704, dated 10 / 16 / 2025, pp. 33 / 48 13 / 17 21a, 21b which are intermittent by an annular groove 23. The annular groove 23 serves as a gas inlet 24 for the nozzle 1 receiving gas from a source of a device / handle. Additionally, an interlock device of the base / handle can engage with the groove 23 in order to lock the nozzle 1 with the base or handle, respectively. For the tip 17 of the blade nozzle 10, the conical section 21b is followed by a profiled surface 22 in order to facilitate rotation of the nozzle 1 around its longitudinal axis R. The rear face of the connector 20 opposite the front face 17 and the profiled surface 22 are designed such that the electrode 11 projects beyond the rear face of the connector 20. The rear side of the nozzle 1 is designed, as shown in Figures 2 and 3, such that the lower blade / PCB 12 has a U-shaped form and the electrode 11 is exposed on a rear surface of the nozzle 1 where the area of ​​the electrode 11 extends beyond the rear surface of the connector 20.The shorter stem of the U-shape is completely overshaped by connector 20.

[00037] The lower blade 12 and the electrode 11 are curved such that the electrode 11 forms a rear face of the nozzle 1 in order to engage with an electrical connector of the handle / base and provide an electrical connection even during rotation of the nozzle 1.

[00038] As can be seen in Figure 2, the gas inlet 14' of the blade nozzle 10 is arranged on a rear face of the upper blade 13 and the spacer 15. The rear section of the blade nozzle 10 is overmolded by the connector 20 in such a way that a sealed gas connection from the annular groove 23 of the connector 20 with the gas inlet 14' of the blade nozzle 10 is provided. Petition 870250094704, dated 10 / 16 / 2025, pp. 34 / 48 14 / 17

[00039] In an alternative configuration, the annular groove 23 serves only to lock the nozzle 1 to the base / handle and the gas inlet 24 is projected onto the rear face of the connector 20. As can be seen in Figure 3, the electrode 11 is covered by a non-conductive material in the section between the electrode tip 19 and the rear face 19' of the electrode. The electrode 11 may be covered by a varnish 18. By covering the electrode 11, unwanted ignition of the gas in the gas channel 16 is avoided.

[00040] Figure 3a is a detailed illustration of the electrode tip 19 and the gas outlet section 14 of the blade nozzle 10. The illustration shows the sandwich design of the blade nozzle 10. The lower and upper planar blades 12, 13 are arranged parallel to each other and are spaced apart and connected by the spacer 15 serving as a side wall. The electrode 11 is attached with the lower blade 12 serving as an electrode carrier.

[00041] The rotating axis R shown in Figure 1 is located on the cutting surface AA, which itself is a symmetry surface of the blade nozzle 10. The rotating axis R is located between the lower blade 12 and the upper blade 13, in particular halfway between the lower and upper blades 12, 13.

[00042] Figures 4a to 4c illustrate a second embodiment of a blade nozzle 10 according to the present invention. The second embodiment differs from the first embodiment, inter alia, in the design of the gas inlet 14'. The gas inlet 14' in the second embodiment is formed by a recess in the upper blade 13, similar to the gas outlet 14. Additionally, the spacer 15 completely surrounds the gas channel 16. It is designed as a seal. Petition 870250094704, dated 10 / 16 / 2025, pp. 35 / 48 15 / 17 circumferential between the lower surface and the upper surface 12, 13. It serves as side walls as well as front and back walls.

[00043] Additionally, a through hole may extend through both rods of the U-shaped blade nozzle 10. The spacer 15 and the upper blade 13 may be applied to both rods of the lower blade 12 while the rear face of the U-shaped blade nozzle 10 is free of the spacer 15 and the upper blade 13 so as to provide a contact surface for the electrode 11. On the shorter rod the spacer 15 and the upper blade 13 are applied such that they surround the through hole and thus provide reinforcement.

[00044] The hole drilled through both stems of the U-shaped blade nozzle 10 provides a positional reference and also a support in the mold during the molding of the connector 20. Additionally, it provides reinforcement for the connection between the blade nozzle 10 and the molded connector 20.

[00045] Figures 5a and 5b illustrate a third embodiment of a blade nozzle 10 according to the present invention. It differs from the second embodiment according to Figures 4a to 4c in that it comprises not only one, but four gas outlets 14 and 14c. In addition to the centrally located gas outlet 14 on the upper blade 13 near the tip 17, it comprises two outlets 14a, 14b on the upper blade 13 and the spacer / side walls 15, as well as an outlet 14c on the upper blade 13 further aft. Both gas outlets 14 and 14c are located above the rotating axis R, and the cross-sectional surface AA divides each of the two recesses into two mirrored parts. The first outlet 14 is arranged Petition 870250094704, dated 10 / 16 / 2025, pp. 36 / 48 16 / 17 closest to tip 17, in which the fourth outlet 14c is arranged further back on the rear face. The second gas outlet 14a and the third outlet 14b are formed as recesses extending from the longitudinal sides on the upper blade 13 and also on the side walls / spacer 15. Both recesses 14a, 14b are arranged in the same longitudinal position of the blade nozzle 10 and are shaped in a mirrored inverted manner on opposite sides.

[00046] For each of the recesses 14 to 14c there is a corresponding designated electrode tip 19 to 19c. Each of the electrode tips 19 to 19c comprises a corresponding conduction path such that each electrode 11 to 11c can be independently supplied with electrical power. Each electrode 11-llc has its own electrode back face 19' to 19c' serving as an electrical contact. The arrangement pattern of the outputs 14 to 14c and the electrode tips 19 to 19c together with the independent electrical control of the electrodes 11 to 11c provides the possibility of influencing and modifying the structure and propagation of atmospheric pressure plasma.

[00047] In an alternative embodiment (not shown) the blade nozzle 10 may comprise multiple gas outlets and electrode tips, but only a single electrode that branches into multiple tips. Even though there is the possibility of controlling each electrode 11 to 11c independently, all electrodes have the same polarity, but the amount of voltage may be different or at least different over time. List of reference numerals 1 nozzle Petition 870250094704, dated 10 / 16 / 2025, pp. 37 / 48 17 / 17 blade nozzle electrode The second electrode 11b third electrode 11c fourth electrode carrier / lower blade (PCB) upper blade gas outlet 14th second gas outlet 14b third gas outlet 14c fourth gas outlet 14' recess (gas inlet) spacer gas channel V-shaped tip electrode tip varnish 19a second electrode tip 19b third electrode tip 19c fourth electrode tip 19' rear electrode face 19a' second rear electrode face 19b' third rear electrode face 19c' fourth rear face of connector electrode 21st conic section 21b second conical section profiled surface annular groove nozzle gas inlet Petition 870250094704, dated 10 / 16 / 2025, pp. 38 / 48

Claims

1 / 3 CLAIMS 1. Nozzle (1) for generating an atmospheric pressure plasma having a monopolar electrode (11) characterized in that the nozzle (1) comprises a blade nozzle (10) with an upper blade and a lower blade (12, 13) between which a gas channel (16) is formed, a gas outlet (14) is formed in the upper blade (13) and the electrode (11) is exposed in the area of ​​the outlet (14).

2. Nozzle (1), according to claim 1, characterized in that the nozzle (1) comprises a V-shaped recess (17) formed at one end (14) of the blade nozzle (10).

3. Nozzle (1), according to any of the preceding claims, characterized in that the blade nozzle (10) can be flexibly bent in a direction orthogonal to the upper surface and the lower surface of the blade (12, 13).

4. Nozzle (1), according to any of the preceding claims, characterized in that the blade nozzle (10) comprises multiple gas outlets (14-14c).

5. Nozzle (1), according to claim 4, characterized in that each of the outlets (14-14c) has a corresponding electrode tip (19-19c) and preferably a corresponding electrode (11-11c).

6. Nozzle (1), according to any of the preceding claims, characterized in that the upper blade and the lower blade (12, 13) are connected to each other at their lateral end portions and at their tip portion. Petition 870250094704, dated 10 / 16 / 2025, page 39 / 48 2 / 3 7. Nozzle (1), according to claim 6, characterized in that the connection between the upper blade and the lower blade (12, 13) is formed by means of a spacer forming a side wall (15) of the blade nozzle (10).

8. Nozzle (1), according to claim 7, characterized in that at least one gas outlet (14-14c) extends from the upper blade (13) to the side wall.

9. Nozzle (1), according to claim 7 or 8, characterized in that at least one gas outlet (14-14c) is located on the side wall (15).

10. Nozzle (1), according to any of the preceding claims, characterized in that the electrode (11) is formed of copper, preferably copper with a gold coating.

11. Nozzle (1), according to any of the preceding claims, characterized in that at least one of the lower blade (12), the upper blade (13) and the side wall (15) is made of a flexible PCB material, preferably polyamide or FR4.

12. Nozzle (1), according to any of the preceding claims, characterized in that the electrode (11) is formed as a conductive rail on the lower blade (12), particularly on the inner surface of the lower blade (12).

13. Nozzle (1), according to any of the preceding claims, characterized in that the electrode (11) is partially coated with a varnish (18) as an insulator. Petition 870250094704, dated 10 / 16 / 2025, page 40 / 48 3 / 3 14. Nozzle (1), according to any of the preceding claims, characterized in that the nozzle (1) comprises a connector (20) in a rear section of the blade nozzle (10).

15. Nozzle (1), according to claim 14, characterized in that the connector (20) comprises a gas inlet (24) and an electrical connector (19') and is preferably formed of plastic, more preferably of molded plastic. Petition 870250094704, dated 10 / 16 / 2025, pp. 41 / 48

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