EP4003203A1 - Instrument pour la chirurgie plasma et procédé pour produire un plasma - Google Patents

Instrument pour la chirurgie plasma et procédé pour produire un plasma

Info

Publication number
EP4003203A1
EP4003203A1 EP20740640.6A EP20740640A EP4003203A1 EP 4003203 A1 EP4003203 A1 EP 4003203A1 EP 20740640 A EP20740640 A EP 20740640A EP 4003203 A1 EP4003203 A1 EP 4003203A1
Authority
EP
European Patent Office
Prior art keywords
electrode
coating
distal end
instrument according
instrument
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.)
Pending
Application number
EP20740640.6A
Other languages
German (de)
English (en)
Inventor
Tjark BRANDT
Uwe Schnitzler
Johannes HEYM
Martin Walz
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.)
Erbe Elecktromedizin GmbH
Original Assignee
Erbe Elecktromedizin GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Erbe Elecktromedizin GmbH filed Critical Erbe Elecktromedizin GmbH
Publication of EP4003203A1 publication Critical patent/EP4003203A1/fr
Pending legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B18/04—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
    • A61B18/042—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating using additional gas becoming plasma
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B18/04—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
    • A61B18/12—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating by passing a current through the tissue to be heated, e.g. high-frequency current
    • A61B18/14—Probes or electrodes therefor
    • A61B18/1482—Probes or electrodes therefor having a long rigid shaft for accessing the inner body transcutaneously in minimal invasive surgery, e.g. laparoscopy
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B18/04—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
    • A61B18/12—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating by passing a current through the tissue to be heated, e.g. high-frequency current
    • A61B18/14—Probes or electrodes therefor
    • A61B18/1492—Probes or electrodes therefor having a flexible, catheter-like structure, e.g. for heart ablation
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B2018/00005—Cooling or heating of the probe or tissue immediately surrounding the probe
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B2018/00005—Cooling or heating of the probe or tissue immediately surrounding the probe
    • A61B2018/00011—Cooling or heating of the probe or tissue immediately surrounding the probe with fluids
    • A61B2018/00029—Cooling or heating of the probe or tissue immediately surrounding the probe with fluids open
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B2018/00053—Mechanical features of the instrument of device
    • A61B2018/00059—Material properties
    • A61B2018/00071—Electrical conductivity
    • A61B2018/00077—Electrical conductivity high, i.e. electrically conducting
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B2018/00053—Mechanical features of the instrument of device
    • A61B2018/00059—Material properties
    • A61B2018/00089—Thermal conductivity
    • A61B2018/00095—Thermal conductivity high, i.e. heat conducting
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B2018/00053—Mechanical features of the instrument of device
    • A61B2018/00107—Coatings on the energy applicator
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B2018/00053—Mechanical features of the instrument of device
    • A61B2018/00107—Coatings on the energy applicator
    • A61B2018/00148—Coatings on the energy applicator with metal
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B2018/00315—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body for treatment of particular body parts
    • A61B2018/00482—Digestive system
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B2018/00571—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body for achieving a particular surgical effect
    • A61B2018/00589—Coagulation
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B2018/00571—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body for achieving a particular surgical effect
    • A61B2018/00601—Cutting
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B2018/00571—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body for achieving a particular surgical effect
    • A61B2018/00607—Coagulation and cutting with the same instrument

Definitions

  • the invention relates to an electrosurgical instrument, in particular for plasma treatment of biological tissue, in particular for plasma coagulation, and a method for generating plasma.
  • a plasma coagulation instrument with an electrode designed as a flat plate and a plasma coagulation instrument with a wire-shaped electrode are known, both of which are arranged in a lumen of a hose-like fluid conductor. Due to their shape, the electrodes are supported on the inner wall of the lumen so that the tip of the respective electrode is in the lumen
  • the electrical discharge emanating from the electrode forms a plasma jet with the gas flowing through the lumen.
  • WO 2005/046495 A1 also discloses a similar instrument with a wire-like or pin-like electrode which is held in a fixed position in the center of a lumen of a hose-like fluid conductor. To fix the electrode is a diametrically stretched through the channel, it is supported with its long edges on the inner wall of the lumen, on which the electrode is attached. The electrode is formed, for example, by a tungsten wire.
  • EP 1 743 588 B1 discloses an electrosurgical electrode for contact coagulation which has an electrode body which consists of molybdenum in its core and is plated with a silver alloy. The silver alloy consists of silver with 1.4% to 4% Germanium and one to 1% to 2% indium. With such electrodes, the impairments occurring on the tissue are to be reduced when the tissue is cut.
  • the instrument has a fluid conductor with at least one lumen in which an electrode is arranged in front of preferably stationary and preferably centered.
  • the electrode consists of an electrode body which, starting from its distal end, extends in the proximal direction into the lumen and on which a coating device is arranged.
  • the lumen can be connected to a gas source, in particular an argon source, so that the electrode is arranged in a fluid stream.
  • the instrument can emit an axially or laterally directed plasma jet at the distal end.
  • the lumen can be implemented as a channel of a hose or pipe.
  • the hose or tube can have one or more lumens.
  • the electrode is at least partially arranged in the lumen and is preferably centered axially adjustable or axially fixed.
  • the electrode can be attached to a holder that extends up to the delimitation surface of the lumen. Alternatively, it can extend itself up to the boundary surface in order to be supported on this.
  • the distal end of the electrode is placed in one embodiment of the invention within the lumen.
  • the plasma jet is thus created in or on the distal end section of the lumen.
  • the end of the electrode does not stick out of the lumen and is therefore protected from direct tissue contact.
  • the electrode can also be placed so that its distal end protrudes from the lumen.
  • the electrode can carry an isolator at its distal end.
  • the insulator is preferably made of an electrically insulating ceramic material.
  • the insulator can be designed as a ball which is carried by the electrode.
  • the insulator can also be designed as a hemisphere which is carried by the electrode.
  • the insulator can turn its rounded or its flat side towards the lumen.
  • the insulator can also be designed as a cylinder with a rounded end.
  • the insulator can also be designed as a circular cone with a rounded or flat base.
  • the isolator can turn its base or its conical side towards the lumen.
  • the insulator can also be designed as a disk.
  • the insulator is preferably designed and arranged to be rotationally symmetrical with respect to the wire-shaped electrode.
  • a laterally directed opening can remain between the insulator and the distal end of the hose or tube, through which gas and / or plasma can exit.
  • the opening can stretch over 360 ° around the electrode. It can, for example, be designed as an annular slot or as a wide, annular free area between the insulator and the hose or pipe end. In this case the insulator is only supported by the electrode. It is not connected to the pipe or hose or to the elements arranged therein.
  • the laterally directed opening can also be divided into two or more partial openings.
  • the insulator can have one, two or more webs with the hose or Connect tube in which the lumen is formed and the electrode is arranged.
  • the web or webs can be connected to an element arranged in the lumen or to an element arranged on the outside of the tube or hose, for example a holder.
  • the holder can be formed integrally with the webs and the insulator from ceramic.
  • That part of the electrode at which discharge base points of the plasma discharge form can be arranged completely outside the lumen.
  • the electrode can protrude 1 mm to 3 mm from the lumen.
  • the coating arranged on the electrode body envelops the electrode body, the cross-section of the coating at a distance of several millimeters from the distal tip making up at least 12% of the area of the cross-section of the entire electrode. This preferably applies to a considerable portion of at least a few millimeters extending away from the distal end of the electrode in the proximal direction, regardless of the shape of the electrode.
  • the coating on the distal end of the electrode is reduced or eliminated regardless of the geometrical shape of the electrode at least after some time of intended use and during the same.
  • the distal end of the electrode can be free of coating even before the first use, or the coating can be applied to the distal end Have a reduced thickness at the end or be interrupted once or more times.
  • the distal end is understood to mean an end section of the electrode which can be 1 mm to 3 mm long.
  • the distal end can be blunt, rounded, tapered or tapered to a point.
  • the electrode can be designed as a plate with a distal tip or as a pin-shaped or needle-shaped electrode (so-called wire electrode).
  • the electrode is preferably arranged in a fixed or longitudinally movable manner in the lumen of the fluid conductor by suitable means, for example a holder. It is preferably centered.
  • the coating of the electrode preferably has a melting temperature that is lower, preferably significantly lower, than the melting temperature of the
  • the electrode body is preferably made of a material with a melting point above 1000 ° C. It can consist of steel, stainless steel, in particular chromium- and / or nickel-containing steels, molybdenum, tungsten, hard metal or another preferably electrically conductive material.
  • the electrode body preferably consists of a carbon-containing metal or a carbon-containing metal alloy. The carbon content is preferably greater than 0.02% by weight, preferably at least 0.05% by weight. %.
  • the coating preferably has a low melting temperature of less than 1000 ° C.
  • the melting temperature is preferably chosen to be so low that the operating conditions for which the instru- Ment is provided, at least part of the coating material at the distal end or in the vicinity of the distal end of the electrode melts.
  • the conditions of use for which the instrument is intended relate to the gas flows and electrical power provided during operation on the patient.
  • the coating material can preferably be silver or a silver alloy. In particular, a material is given as a coating material that reacts little or not at all with the gas flowing in the lumen.
  • an electrode structure can be formed at the beginning of the use of the instrument in which the coating of the electrode at the distal end of the electrode is absent or has a structure that deviates from the structure of the rest of the coating. It can thereby be achieved that the electrical discharge is concentrated on the distal end of the electrode. The heat input into the electrode is thus also concentrated on the distal end of the same. As a result, the electrode absorbs significantly less heat than known electrodes, in which the discharge base on the electrode wanders or jumps ent long.
  • the electrode can have a rough surface at its distal end, at least after the initial start-up, on which there are at least some islands freed from coating material.
  • the electrode base material preferably contains carbon, which forms an accumulation in some places and is exposed in some places.
  • the carbon can be surrounded by coating material or be rich in Be that are free of coating material. Carbon clusters can form root discharge points. The effects mentioned occur in particular with electrode diameters below 0.5 mm and coatings, the thickness of which exceeds a minimum. The minimum dimension is reached when at least 10%, better 12% of the electrode cross-sectional area is made of coating material.
  • the coating can melt in particular at the distal end and form a completely or partially liquid area.
  • the coating can withdraw somewhat from the distal end of the electrode body and expose the electrode body in whole or in part. However, it shows an increased electrode service life with significantly reduced material removal compared to uncoated electrodes.
  • the concentration of the electrical discharge on the outer distal end of the electrode minimizes the entry of thermal energy into the electrode.
  • the fluid conductor can be made entirely of plastic and a ceramic lining is also superfluous at the distal end. It is also possible to dispense with cooling the electrode by means of a heat sink or other measures.
  • a thermally and / or electrically insulating material such as ceramics or plastic can be used as the electrode holder without the risk of damage to the instrument even after prolonged use.
  • the electrode has a length at its distal end, for example at least 2 mm, preferably at least 2.5 mm, the heat capacity of which is less than 4.5 mJ / K, preferably less than 4.17 mJ / K.
  • the low heat capacity contributes to the localization and fixation of the discharge at the distal end of the electrode.
  • the electrode quickly reaches its operating temperature at which the coating metal is at least partially liquid. It can pull away from the hot electrode tip.
  • the discharge base is fixed to the hot electrode tip. It does not migrate in the proximal direction and, in particular, does not cross the forming ringför shaped barrier made of molten coating metal (eg silver).
  • the invention also includes a concept for the formation of the electrode with anchoring of the discharge base or the discharge base at the distal end of the
  • the discharge base points are points with increased electron exit compared to the surroundings. They are visible in the as places from which strongly luminous strands that are visible in the plasma emanate.
  • the desired design of the electrode can also be achieved by shaping the electrode when it is used for the first time.
  • a still unused electrode can have a largely precisely defined geometric shape, in particular at its distal end.
  • the coating can extend with a largely constant thickness to the outermost distal end of the electrode.
  • one or more areas of the distal end of the electrode can be exposed or have a reduced thickness of the coating.
  • the electrode surface at the distal end differs from the electrode surface at more proximal sections of the electrode.
  • the differences can be of a material or structural nature.
  • the distal end of the electrode can have carbon particles on the surface.
  • the differences in the surface of the distal end to the surface of the other electrode lead to the fixation of the discharge base points at the extreme distal end of the electrode and thus to the minimization of the heat input into the electrode and the surrounding wall of the fluid conductor.
  • Figure 1 shows an instrument and the device provided for supply, in a schematic representation
  • FIG. 2 shows a distal end section of an instrument according to the invention, in an enlarged, longitudinally sectioned basic illustration
  • FIG. 3 shows a distal end section of the instrument according to FIG. 2 during operation
  • FIG. 4 shows a cross section through the electrode according to FIG. 3, cut along the line IV-IV,
  • FIG. 5 shows an electrode in longitudinal section of its distal end section before its first use, in longitudinal section
  • Figure 6 shows the electrode according to Figure 5, in the formed state
  • FIGS. 7 and 8 show further embodiments of an electrode according to the invention before initial start-up, in longitudinal section.
  • FIG. 1 illustrates an instrument 10 which is designed as an endoscope probe. It is used for plasma coagulation, in particular argon plasma coagulation, i.e. for treating human or animal tissue without direct physical contact between its electrode 11 and the corresponding biological tissue.
  • the instrument 10 is designed as a flexible probe. The principles explained below can also be implemented on a rigid instrument suitable for laparoscopic use or an instrument suitable for open surgery.
  • the instrument 10 has a fluid conductor 12, for example in the form of a flexible tube 13, which extends from a distal end 14 to its proximal end 15.
  • a lumen 16 which can be seen in particular from FIG. 2, leads through the length of the tube 13.
  • a gas typically an inert gas such as argon, flows through this lumen.
  • the instrument 10 is connected to a device 17 which contains a gas source 18 or provides a connection to such.
  • the gas flows from the proximal end 15 to the distal end 14 of the tube 13 and thus the lumen 16 and from this out of the open end of the tube 13.
  • the electrode 11 is arranged, the distal end 19 of which preferably does not protrude from the fluid conductor 12, but rather is still positioned in the lumen 16. In some embodiments, however, it can also protrude with a section from the fluid conductor 12 and / or the lumen 16.
  • the electrode 11 is preferably a pin or needle electrode, which can be formed, for example, by a round or profile wire or also by a tube or a cannula.
  • Electrode 11 can also be formed by the distal end of the wire extending through lumen 16.
  • the electrode 11 can have a substantially constant cross section. Regardless of its specific shape, it can preferably be centered in the lumen 16 and be kept stationary or axially movable.
  • the holder 20 provided for this purpose carries the electrode 11 and is supported on the inside on the fluid conductor 12 or the hose 13.
  • the electrode 11 is electrically connected to a generator 21, for example an HF generator, which emits a high-frequency electrical voltage to the electrode 11.
  • a generator 21 for example an HF generator, which emits a high-frequency electrical voltage to the electrode 11.
  • a corresponding connecting conductor can extend from the electrode 11 through the entire lumen 16 to the proximal end 15, at which an electrical connection provides the contact to the generator 21.
  • the generator 21 is preferably set up to deliver a voltage which is sufficiently high to generate an electrical discharge at the tip of the electrode 11 and thereby at least partially ionize the gas stream flowing along the electrode 11 A plasma jet is generated for the treatment of biological tissue.
  • the electrode 11 is, for example, a slim cylinder with a ner flat, round, conical or conical tip or overall designed as a slender cone. At least in the vicinity of its distal end 19, it preferably has a diameter of less than 0.5 mm, preferably at most 0.3 mm. Therefore, its radius R apparent from FIG. 4 is less than 0.25 mm, preferably less than 0.15 mm. Radii smaller than 0.1 mm are possible.
  • the electrode 11 can also have a prismatic shape, for example by being designed as a profile wire. It can also be designed as a flat plate with a tip oriented in the distal direction.
  • FIG. 4 illustrates a cross section of the electrode 11 at an axial distance of a few millimeters from the distal end 19 of the electrode 11. The distance is so great that the structure of the electrode 11 remains unchanged in operation.
  • the electrode 11 has an electrode body 22 which is provided with a coating 23.
  • the electrode body 22 and the Beschich device 23 are made of different materials.
  • the melting temperature T K of the Elektrodenkör pers 22 is preferably above 1000 ° C.
  • the electrode body 22 can also consist of another thermally stable, electrically conductive or also electrically, at least in the cold state, non-conductive material, such as ceramic.
  • the electrode body 22 can consist of a high-melting metal such as steel, stainless steel, hard metal, molybdenum, tungsten or the like.
  • a stainless steel preferred as the base material has the following composition:
  • the coating 23 is preferably at least partially made of an electrically good conductive low-melting material with a melting point preferably lower than 1000 ° C, the coating 23 can for example consist of silver or silver alloys.
  • the thickness D of the coating 23 is preferably at least so large that the proportion of the area of the cross-hatched cross-hatched cross-hatched cross-sectional area of the coating 23 of the total cross-sectional area of the electrode 11 is greater than 10%, preferably greater than 12%.
  • the total cross-sectional area is the cross-sectional area with the area of a circle of radius R. In Figure 4, this corresponds to the sum of the area of the cross-sectional area of the electrode body 22 (hatched in Figure) and the area of the cross-sectional area of the coating 23 (cross-hatched in Figure 4 ).
  • the explained relationship between the cross-sectional area of the coating 23 and the total cross-sectional area of the electrode 11 applies regardless of its specific cross-sectional shape.
  • the electrode 11 can thus have a hollow cylindrical or a polygonally delimited cross section.
  • An intermediate layer 24 can be provided between the coating 23 and the electrode body 22.
  • This can consist of a metal, preferably a noble metal, a noble metal alloy or an inert metal, e.g. nickel, a nickel alloy,
  • the melting temperature T z of the material of the intermediate layer 24 is preferably between the melting temperatures T K and T B of the materials of the electrode body 22 and the coating 23 (T K > T Z > T B ).
  • the intermediate layer 24 can act as an adhesion promoter and at the same time favor the withdrawal of the melting coating 23 from the electrode body 22 at the distal end 19.
  • So instruments 11 can be designed with delicate outer dimensions from.
  • the outer diameter of the fluid conductor 12 can be 1 mm or less, if necessary.
  • the resulting miniaturization possibility is based on the low generation of heat and heat radiation at and from the electrode 11. This is achieved by combining at least some of the measures described above. In particular, this ensures that the electrical discharge is concentrated on the distal end 19 of the electrode 11 during operation.
  • This has a section 25 which is preferably several millimeters long and adjoins the distal end 19.
  • the section 25 preferably ends proximally in front of or on the holder 20.
  • the coating can, however, also extend further in the proximal direction over the holder 20 and continue. In the distal direction, the section 25 ends at the distal end 19 of the electrode 11.
  • the distal end 190 begins at an area 26 shown in FIG. 3, which is so close to the discharge base points 27 that are formed that 26 material of the Coating 23 is or may be in liquid form in operation.
  • At least parts of the electrode body 22 are exposed at the distal end 19 during operation.
  • the exposed area forms the distal end 19.
  • a section 19a is formed whose heat capacity is preferably less than 4.5 mJ / K, more preferably less than Is 4.17 mJ / K. From the section 19a can be formed by the distal end 19.
  • the low heat capacity of the section 19a enables the local melting of the coating 23. It also ensures constant electron emission from the end 19 immediately after the ignition of a plasma, even at low RF powers. This promotes the concentration of the plasma discharge on the distal end of the electrode and thus reduces the heat input into it.
  • the lumen 16 is first exposed to gas so that a gas flow results in the distal direction.
  • Argon for example, which flows along the electrode 11, can serve as the gas.
  • the electrode 11 is electrically connected to the generator 21.
  • the one on that Voltage applied at the distal end 19 leads to a sparkover to a nearby counterelectrode, which can be biological tissue, for example.
  • the electrode 11 has the initial shape illustrated in FIG. 5, which is determined geometrically.
  • the electrode body 22 is cylindrical, while the coating 23 has a constant thickness essentially everywhere.
  • the coating 23 extends from the distal end 19 a few millimeters or centimeters in per ximal direction and can then end or continue.
  • the coating 23 can extend over the end face of the electrode body 22 or it can also leave it free, as can be seen from the example according to FIG.
  • the coating 23 can also be removed from an end region, for example from the distal end 19, during the production of the electrode, as FIG. 7 shows.
  • the distal end 19 of the electrode 11 can be tapered, designed as a truncated cone or also as a wedge.
  • the electrode 11 can be produced by cutting off a sufficiently long section from an endlessly supplied coated wire. If necessary, the distal end 19 can be reworked to remove material in order to completely or partially remove the coating 23 at the end 19.
  • the distal end 19 of the electrode 11 is initially heated, so that it is then redesigned for further operation.
  • a region 26 is formed on the electrode 11 in which the material of the coating 23 is at least partially melted, as illustrated in FIG. In the area 26 can Coating be thicker than in the remaining area of the electrode 11. In contrast, the coating at the outer end 19 can have a smaller thickness, be interrupted or completely absent.
  • the processes described above in connection with the initial start-up can also be carried out in the course of manufacturing the instrument 10.
  • the manufacturer can briefly put the instrument 10 into operation under controlled conditions.
  • the manufacturer can specify the gas type and gas flow as well as the voltage and current, as for operation on the patient. However, he can also choose different gas types, gas flows or operating voltages or flows.
  • the distal end 19 of the electrode 11 becomes hot and electron-emissive, while the electrode 11 reaches far lower temperatures in the area 26 and in particular further proximally in the section 25 and remains relatively cool there.
  • the discharge base points 27 (FIG. 3) are fixed at the distal end 19 without migrating in the proximal direction. The electrode 11 thus emits very little heat and does not contribute significantly to the heating of the fluid conductor 12.
  • the instrument 10 has an electrode 11 which is arranged in a gas-carrying lumen 16 and held in a centered manner.
  • the electrode 11 has an electrode body 22 made of a thermally stable Ma material, for example hard metal, tungsten, steel, stainless steel or the like.
  • the electrode 11 is provided with a coating 23 made of a low-melting material, such as, for example, silver, silver alloys or another low-melting metal.
  • an adhesive layer 24, in particular a gold layer can be provided between the Coating 23 and the electrode body 22, an adhesive layer 24, in particular a gold layer, can be provided. This can facilitate the pulling back of the coating 23 upon initial start-up and thus during the formation of the shape of the electrode 11 desired for operation (for example according to FIG. 6).

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  • Details Of Resistors (AREA)

Abstract

L'instrument (10) selon l'invention présente une électrode (11) qui est disposée dans une lumière conductrice de gaz (16) et maintenue de manière centrée. L'électrode (11) présente un corps d'électrode (22) en un matériau thermiquement stable, par exemple en métal dur, en tungstène, en acier, en acier inoxydable ou analogue. L'électrode (11) est recouverte d'un revêtement (23) constitué d'un matériau à bas point de fusion comme l'argent, les alliages d'argent ou un autre métal à bas point de fusion. Une couche adhésive (24), en particulier une couche d'or, peut être prévue entre le revêtement (23) et le corps d'électrode (22). Cela peut favoriser la rétraction du revêtement (23) lors de la première mise en service et par conséquent lors du façonnage de la forme souhaitée de l'électrode (11) pour le fonctionnement.
EP20740640.6A 2019-07-23 2020-07-21 Instrument pour la chirurgie plasma et procédé pour produire un plasma Pending EP4003203A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP19187863.6A EP3769707B1 (fr) 2019-07-23 2019-07-23 Ensemble d'électrode
PCT/EP2020/070585 WO2021013852A1 (fr) 2019-07-23 2020-07-21 Instrument pour la chirurgie plasma et procédé pour produire un plasma

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EP4003203A1 true EP4003203A1 (fr) 2022-06-01

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EP19187863.6A Active EP3769707B1 (fr) 2019-07-23 2019-07-23 Ensemble d'électrode
EP20740640.6A Pending EP4003203A1 (fr) 2019-07-23 2020-07-21 Instrument pour la chirurgie plasma et procédé pour produire un plasma
EP20740638.0A Active EP4003202B1 (fr) 2019-07-23 2020-07-21 Ensemble d'électrode

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EP19187863.6A Active EP3769707B1 (fr) 2019-07-23 2019-07-23 Ensemble d'électrode

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EP20740638.0A Active EP4003202B1 (fr) 2019-07-23 2020-07-21 Ensemble d'électrode

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US (3) US20220257302A1 (fr)
EP (3) EP3769707B1 (fr)
JP (3) JP7476296B2 (fr)
KR (3) KR102888007B1 (fr)
CN (3) CN114126524B (fr)
BR (3) BR112021023591A2 (fr)
WO (3) WO2021013847A1 (fr)

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CN117165918B (zh) * 2023-11-02 2024-02-20 成都仕康美医疗器械有限公司 一种降低组织焦痂的电外科器械用电极及其制备方法
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US20220257302A1 (en) 2022-08-18
BR112021024172A2 (pt) 2022-03-22
JP2022541599A (ja) 2022-09-26
US20220265336A1 (en) 2022-08-25
WO2021013840A1 (fr) 2021-01-28
CN114126523A (zh) 2022-03-01
JP7476296B2 (ja) 2024-04-30
EP3769707A1 (fr) 2021-01-27
US20220280219A1 (en) 2022-09-08
KR102869118B1 (ko) 2025-10-14
BR112021023591A2 (pt) 2022-01-04
JP7583021B2 (ja) 2024-11-13
BR112021024096A2 (pt) 2022-04-19
RU2020123442A (ru) 2022-01-17
CN114126524B (zh) 2025-07-04
EP3769707B1 (fr) 2026-01-14
JP7545464B2 (ja) 2024-09-04
KR20220039731A (ko) 2022-03-29
EP4003202A1 (fr) 2022-06-01
EP3769707C0 (fr) 2026-01-14
EP4003202B1 (fr) 2026-01-07
CN114126525A (zh) 2022-03-01
KR20220039732A (ko) 2022-03-29
JP2022540962A (ja) 2022-09-20
CN114126523B (zh) 2025-03-07
KR102888007B1 (ko) 2025-11-20
EP4003202C0 (fr) 2026-01-07
KR20220039730A (ko) 2022-03-29
WO2021013852A1 (fr) 2021-01-28
CN114126524A (zh) 2022-03-01
JP2022541066A (ja) 2022-09-21
WO2021013847A1 (fr) 2021-01-28

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