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WO2019078275A1 - Électrode pour équipement médical à haute fréquence et équipement médical à haute fréquence - Google Patents

Électrode pour équipement médical à haute fréquence et équipement médical à haute fréquence Download PDF

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Publication number
WO2019078275A1
WO2019078275A1 PCT/JP2018/038715 JP2018038715W WO2019078275A1 WO 2019078275 A1 WO2019078275 A1 WO 2019078275A1 JP 2018038715 W JP2018038715 W JP 2018038715W WO 2019078275 A1 WO2019078275 A1 WO 2019078275A1
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Prior art keywords
electrode
high frequency
conductive
medical device
intermediate layer
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English (en)
Japanese (ja)
Inventor
義幸 小川
広明 葛西
卓矢 藤原
由 村野
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Olympus Corp
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Olympus Corp
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    • 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

Definitions

  • the present invention relates to an electrode for a high frequency medical device and a high frequency medical device.
  • Priority is claimed on Japanese Patent Application No. 2017-201785, filed Oct. 18, 2017, the content of which is incorporated herein by reference.
  • high frequency medical devices are used to treat living tissue by applying a high frequency voltage to living tissue.
  • high frequency medical devices can dissect, coagulate or cauterize biological tissue.
  • biological tissue may be firmly attached to the electrode surface due to repeated treatment during surgery. When the biological tissue adheres to the electrode surface, for example, the treatment performance such as dissection of the electrode to the biological tissue is reduced. In this case, the operator needs to remove the high-frequency medical device and wipe off the adhering matter from the electrode surface. The work of wiping the electrode surface causes the operation time to be prolonged. This increases the burden on the operator and the patient.
  • Patent Document 1 describes a high frequency treatment apparatus configured by coating a surface of a metal electrode with a monomolecular film whose terminal is a fluorine atom.
  • Patent Document 1 the electrode surface is coated with a nonconductive monolayer.
  • Patent Document 1 describes that since the monomolecular film is sufficiently thin and uniform, efficient treatment can be performed without interrupting the power supply from the electrode to the living tissue.
  • the discharge energy in the spark acts locally on the electrode surface in a short time, whereby the metal of the electrode surface becomes May melt or splash.
  • the adhesion preventing film also scatters with the metal on the electrode surface. As a result, the rough metal surface of the electrode substrate is exposed to the electrode surface.
  • Biological tissue is easily attached to the electrode surface after the occurrence of the spark phenomenon, and furthermore, when the biological tissue is attached, peeling is difficult. Therefore, for example, in the electrode having the anti-adhesion film of the living tissue in the high frequency treatment device described in Patent Document 1, etc., the durability of the electrode is low by the progress of the deterioration of the anti-adhesive film when sparks occur during treatment. Become.
  • the present invention has been made in view of the above problems, and provides an electrode for a high frequency medical device and a high frequency medical device capable of reducing the deterioration of the adhesion preventing performance of a living tissue even if a spark occurs at the time of treatment.
  • the purpose is to
  • An electrode for a high frequency medical device comprises: a base material; and an intermediate layer comprising a first metal material laminated on the base material and having a melting point higher than the melting point of the base material. And a conductive antiadhesive film laminated on the intermediate layer.
  • the melting point of the first metal material may be 1900 ° C. or higher.
  • the base material is mainly composed of metal material mainly composed of aluminum and titanium. It may include at least one selected from the group consisting of metallic materials and stainless steel.
  • the first metal material contained in the intermediate layer is One metal element selected from the group consisting of tungsten, molybdenum, tantalum, and niobium may be used as the main component.
  • the conductive antiadhesive film is a silicone resin, silica, And a non-metallic material containing any of the fluorine-based resins as a main component, and a conductive material dispersed in the non-metallic material.
  • the conductive substance in the electrode for a high frequency medical device according to the fifth aspect, may be carbon black or metal particles.
  • the conductive antiadhesive film is mainly composed of gold.
  • a metal layer or a metal layer made of a metal material mainly composed of platinum may be included.
  • the high frequency medical device of the eighth aspect of the present invention comprises an electrode for a high frequency medical device according to any one of the above first to seventh aspects.
  • the electrode for a high frequency medical device and the high frequency medical device according to each of the above aspects, even if a spark is generated at the time of treatment, the deterioration of the adhesion preventing performance of the living tissue can be reduced.
  • FIG. 2 is a cross-sectional view taken along line AA in FIG. It is a typical sectional view of the electrode for high frequency medical devices concerning this embodiment. It is a schematic cross section explaining the effect
  • FIG. 1 is a schematic configuration view showing an example of a high frequency medical device according to an embodiment of the present invention.
  • FIG. 2 is a cross-sectional view taken along line AA in FIG.
  • FIG. 3 is a schematic cross-sectional view of an electrode for a high frequency medical device according to the present embodiment.
  • the high frequency knife 10 which concerns on this embodiment shown in FIG. 1 is an example of the high frequency medical device which concerns on this embodiment.
  • the high frequency knife 10 is a medical treatment tool that incises and cuts out a living tissue, coagulates (hemostasis) the living tissue, and cauters by applying a high frequency voltage.
  • the high frequency knife 10 includes a rod-like grip 2 for an operator to hold by hand, and an electrode 1 (an electrode for a high frequency medical device) protruding from the tip of the grip 2.
  • the electrode unit 1 abuts on a living tissue as a treatment object to apply a high frequency voltage.
  • the electrode portion 1 has a blade portion 1c suitable for incision of a living tissue at the outer edge.
  • the side surface surrounded by the blade portion 1c in the electrode portion 1 constitutes an abdominal portion 1d suitable for coagulation of a living tissue and the like.
  • the abdomen 1 d is a flat surface or a gently curved surface close to a flat surface.
  • the shape shown in FIGS. 1 and 2 is an example of the shape of the electrode unit 1.
  • the electrode portion 1 may have a round rod shape, a square rod shape, a disk shape, a bowl shape, or the like.
  • the electrode unit 1 includes an electrode main body 1A (base material), an intermediate layer 1B, and a conductive antiadhesive film 1C.
  • the external shape of the electrode main body 1A is a rectangular piece having an arc-shaped portion at the corner of the tip in the protruding direction of the electrode portion 1.
  • the electrode body 1A in the cross section orthogonal to the projecting direction (the direction from the back to the front in the drawing), the electrode body 1A has a flat shape whose thickness decreases toward the outer edge.
  • the cross-sectional shape of the outer edge portion at the tip in the projecting direction (the left end of the electrode portion 1 in FIG. 1) is similarly reduced in thickness toward the outer edge.
  • the outer edge portion of the electrode body 1A is rounded in a cross section orthogonal to the projecting direction.
  • the radius of curvature of the roundness of the outer edge portion is appropriately set according to the purpose of use of the high frequency knife 10.
  • the radius of curvature of the roundness of the outer edge portion is shown as one quarter of the thickness of the electrode body 1A as an example.
  • the radius of curvature of the rounding of the outer edge may be larger or smaller than this.
  • the radius of curvature of the radius may be so small as to constitute a sharp edge.
  • metallic material means metal or alloy.
  • a metal material mainly composed of X metal element name
  • X metal element name
  • a metal material containing aluminum as a main component a metal material containing titanium as a main component, stainless steel or the like may be used.
  • an electrode body 1A having a complicated shape is easily manufactured.
  • the metal material containing aluminum as a main component, the metal material containing titanium as a main component, and stainless steel are all metal materials having a melting point of less than 1900 ° C.
  • the melting points of aluminum, titanium, and SUS304 are 660 ° C., 1812 ° C., and 1450 ° C., respectively.
  • One type of metal material may be used for electrode body 1A, and multiple types of metal materials may be compounded.
  • the above-described metal material mainly composed of aluminum, the metal material mainly composed of titanium, and stainless steel is used as the material constituting the electrode body surface 1a. More preferably, either is used.
  • the electrode body 1 ⁇ / b> A is electrically connected to the high frequency power supply 3 by a wire connected to the base end held by the grip 2.
  • the high frequency power supply 3 is electrically connected to a return electrode plate 4 mounted on the treatment subject.
  • the intermediate layer 1 ⁇ / b> B is a thin film laminated on the electrode body surface 1 a and covering at least the entire portion of the electrode body 1 ⁇ / b> A protruding from the grip portion 2.
  • the intermediate layer 1 ⁇ / b> B may cover the electrode body surface 1 a inside the grip portion 2.
  • the intermediate layer 1B may have a single layer structure or a multilayer structure.
  • the intermediate layer 1B includes a layered portion of a metal material (first metal material) having a melting point higher than that of the electrode body 1A.
  • the layered portion made of the first metal material is more preferably provided in contact with the conductive antiadhesive film 1C described later.
  • the intermediate layer 1B may include a graded layer whose composition changes in the layer thickness direction. In the example shown in FIG. 3, the intermediate layer 1B is a single layer.
  • the melting point of the first metal material contained in the intermediate layer 1B is higher as compared to the melting point of the metal material of the electrode body 1A.
  • the melting point of the first metal material contained in the intermediate layer 1B is more preferably 1900 ° C. or higher.
  • the first metal material contained in the intermediate layer 1B is mainly composed of one metal element selected from the group consisting of tungsten, molybdenum, tantalum and niobium.
  • the melting points of tungsten, molybdenum, tantalum and niobium are 3387 ° C., 2623 ° C., 2990 ° C. and 2415 ° C., respectively.
  • the layer thickness of the intermediate layer 1B is not particularly limited.
  • the layer thickness of the intermediate layer 1B may be 0.5 ⁇ m or more and 5 ⁇ m or less.
  • the layer thickness of the intermediate layer 1B is 0.5 ⁇ m to 5 ⁇ m, for example, it becomes easy to manufacture the intermediate layer 1B by sputtering.
  • the conductive antiadhesive film 1C is provided to be laminated on the upper surface 1b of the intermediate layer 1B.
  • the conductive antiadhesive film 1C constitutes the outermost surface of the electrode unit 1 at least in a region in contact with a living tissue (see FIG. 2).
  • the conductive antiadhesive film 1C covers at least the intermediate layer 1B of the electrode main body 1A protruding from the grip portion 2.
  • the conductive antiadhesive film 1 ⁇ / b> C includes a base material 5 (nonmetallic material) and a conductive material 6.
  • the base material 5 has good adhesion to the upper surface 1b of the intermediate layer 1B, and is made of a nonmetallic material that does not easily adhere to living tissue.
  • the base material 5 more preferably includes at least one of the group consisting of silicone resin, silica, and fluorine resin.
  • the conductive substance 6 is contained dispersed in the base material 5.
  • the material of the conductive substance 6 is not particularly limited as long as it can impart conductivity necessary for the electrode portion 1 to the conductive antiadhesive film 1C.
  • carbon-based particles such as carbon black or metal particles may be used. Carbon black is excellent in conductivity and biocompatibility, and is also excellent in dispersibility with respect to a nonmetallic material to be the base material 5. For this reason, carbon black is particularly suitable as the conductive substance 6.
  • metal particles are used as the conductive substance 6, it is more preferable to use a metal material having high electrical conductivity.
  • the conductive substance 6 may be exposed from the base material 5 to constitute a part of the outer surface 1 e of the conductive antiadhesive film 1C. Therefore, as the conductive substance 6, it is more preferable to use a metal material which is biocompatible and to which biological tissue is not easily attached.
  • metal materials suitable for the conductive substance 6 include, for example, metal materials containing gold, silver, platinum, nickel, copper and the like as main components.
  • the electrode unit 1 described above may be manufactured, for example, as follows.
  • an appropriate metal material is processed to manufacture the electrode body 1A.
  • Examples of the method of manufacturing the electrode main body 1A include pressing, cutting, and forming.
  • an intermediate layer 1B is formed on the electrode body surface 1a of the electrode body 1A.
  • Examples of the method of forming the intermediate layer 1B include sputtering, vapor deposition, plating and the like.
  • the conductive antiadhesive film 1C is formed on the upper surface 1b of the intermediate layer 1B.
  • the conductive antiadhesive film 1C may be formed, for example, by painting.
  • the conductive material 6 is mixed with a resin paint or ceramic paint containing the components of the base material 5.
  • the coating means is not particularly limited.
  • the coating means include, for example, spray coating, dip coating, spin coating, screen printing, ink jet method, flexographic printing, gravure printing, pad printing and the like. Since spray coating and dip coating can be easily applied even if the shape of the object to be coated is complicated, they are particularly suitable as a coating means for forming the conductive antiadhesive film 1C on a high frequency medical device.
  • the paint layer formed on the intermediate layer 1B is dried by a method such as heating. Thereby, the conductive antiadhesive film 1C is formed. Above, the electrode part 1 is manufactured.
  • FIG. 4A to FIG. 4D are schematic cross-sectional views for explaining the operation of the electrode for the high frequency medical device of the comparative example.
  • FIG. 5A and FIG. 5B are SEM images showing an example of the electrode surface of the comparative example before and after performing the incision respectively.
  • 6A to 6C are schematic cross-sectional views for explaining the operation of the electrode for a high frequency medical device according to the present embodiment.
  • FIGS. 7A and 7B are SEM images showing an example of the electrode surface according to the present embodiment before and after the incision.
  • the treatment using the high frequency knife 10 is performed, for example, in a state where the counter electrode 4 is attached to a patient (not shown) and the high frequency power is applied to the electrode unit 1 by the high frequency power supply 3.
  • the operator brings the blade 1 c or the abdomen 1 d of the electrode unit 1 into contact with the treatment object such as the treatment unit of the patient while applying the high frequency voltage to the electrode unit 1.
  • the abdomen 1 d is pressed against the treatment object, hemostasis and cauterization of a living tissue can be performed.
  • the operator separates the electrode unit 1 from the treatment object.
  • the living body tissue is difficult to adhere to the outer surface 1e of the conductive antiadhesive film 1C in contact with the living body tissue by the base material 5, the living body tissue is easily peeled off.
  • the electrode part 1 is exposed to high temperature by heat generation by high frequency current.
  • the discharge energy may be concentrated in a minute region between the electrode unit 1 and the living tissue to cause a rapid temperature rise. There is.
  • the electrode part 101 of a comparative example is comprised except the intermediate
  • the conductive antiadhesive film 1C in the electrode portion 101 is laminated on the electrode body surface 1a of the electrode body 1A.
  • the illustrated spark S1 is schematically represented, and it is not intended to accurately indicate the discharge path and the discharge range (the same applies to the illustration of the spark S2 described later).
  • the spark S1 when the spark S1 is generated, the spark S1 causes an insulation breakdown between the electrode body surface 1a of the electrode body 1A and the living tissue T1 to generate a discharge.
  • the spark S1 acts on a minute area, the medium in the discharge path is rapidly heated by the discharge energy.
  • the temperature at this time exceeds the melting point of the electrode body 1A, a part of the electrode body 1A is rapidly melted from the electrode body surface 1a.
  • the metal material of the melted electrode body 1A is scattered or evaporated.
  • the conductive antiadhesive film 1C also melts or evaporates.
  • the hole H is formed.
  • a rough surface 1 f is formed which is an uneven surface due to melting and scattering of the metal material.
  • the living tissue T1 When the living tissue T1 is easily moved, the living tissue T1 is splashed off by the scattering electrode main body 1A or the like and separated from the outer surface 1e. However, since the electrode unit 101 is pressed against a living tissue and used, as shown in FIG. 4B, another living tissue T2 approaches the hole H. As a result, as shown in FIG. 4C, the living tissue T2 that has entered the hole H comes in contact with the rough surface 1f of the hole H. When the living tissue T1 is difficult to move, the living tissue T1 on the hole H enters the hole H and contacts the rough surface 1f of the hole H (see FIG. 4C).
  • FIG. 5A and FIG. 5B The image (SEM image) of an example of the electrode main body surface 1a in the electrode part 101 of the comparative example acquired by the scanning electron microscope (SEM, Scanning Electron Microscope) is shown by FIG. 5A and FIG. 5B.
  • SEM Scanning Electron Microscope
  • FIG. 5A shows a SEM image of the electrode body surface 1a before the incision is made by the electrode unit 101 (before the incision).
  • FIG. 5B shows a SEM image of the electrode body surface 1a after the incision of the mucous layer has been performed 10 times by the electrode unit 101 (after the incision).
  • the size of the display range of each SEM image is 60 ⁇ m ⁇ 45 ⁇ m.
  • the electrode body surface 1a before incision was substantially flat.
  • corrugated surface is formed in the electrode main body surface 1a after incision. This uneven surface is considered to be formed by melting of the electrode body surface 1a.
  • an intermediate layer 1B is provided between the electrode main body 1A and the conductive antiadhesive film 1C.
  • the middle layer 1B is a conductor having excellent conductivity because it is made of a metal material. Therefore, as shown in FIG. 6A, when the spark s1 is generated between the electrode unit 1 and the living tissue t1, the spark s1 is generated between the upper surface 1b of the intermediate layer 1B and the living tissue t1.
  • the illustrated spark s1 is schematically represented, and it is not intended to accurately indicate the discharge path and the discharge range (the same applies to the illustration of the spark s2 described later).
  • the conductive antiadhesive film 1C and the intermediate layer 1B on the path of the spark s1 are rapidly heated.
  • the conductive antiadhesive film 1C according to the present embodiment is melted and evaporated as in the case of the comparative example.
  • the intermediate layer 1B has a melting point higher than that of the electrode body surface 1a, the intermediate layer 1B does not melt at all, or even if it is melted, the amount of melting is smaller than in the comparative example. According to the study of the present inventor, if the intermediate layer 1B contains a metal layer having a melting point of 1900 ° C. or more, the occurrence of melting of the intermediate layer 1B is remarkably suppressed.
  • the intermediate layer 1B contains a metal material whose melting point exceeds 2400 ° C., for example, a metal material whose main component is one metal element selected from the group consisting of tungsten, molybdenum, tantalum, and niobium. For example, melting of the intermediate layer 1B is prevented.
  • the heat transferred to the intermediate layer 1B diffuses in the intermediate layer 1B, and a portion of the heat also conducts to the electrode body 1A.
  • the temperature rise of the electrode body 1A is smaller than that of the comparative example. Even if a part of the electrode body 1A is melted, the molten metal does not scatter as in the comparative example because it is covered by the intermediate layer 1B.
  • the spark s1 even if the spark s1 is generated, only the conductive adhesion preventing film 1C around the spark s1 is broken, so damage to the conductive adhesion preventing film 1C is also smaller than in the comparative example.
  • the adhesion prevention film 1C has few defects, so adhesion is prevented. Performance is maintained. Even if the living tissue t1 touches the upper surface 1b of the intermediate layer 1B, since the upper surface 1b is a flat surface, sticking of the living tissue t1 is less likely to occur compared to the comparative example.
  • a spark s2 is generated between the electrode unit 1 and another living tissue t2 when a high frequency voltage is further applied.
  • a hole h2 is similarly formed around the path of the spark s2 (see FIG. 6C).
  • the conductive adhesion preventing film 1C may be gradually deteriorated by repeatedly using the electrode unit 1. However, compared with the case of the comparative example, the progress of deterioration is delayed. In addition, even if the exposed area of the upper surface 1b of the intermediate layer 1B is increased, the coagulated material is easily peeled off as compared with the comparative example because the upper surface 1b is flat.
  • FIG. 7A and 7B The SEM image of an example of the upper surface 1b of the intermediate
  • tungsten having a layer thickness of 1 ⁇ m was used as the material of the intermediate layer 1B.
  • the same SUS 304 as that of the comparative example was used as a material of the electrode main body 1A.
  • the conductive antiadhesive film 1C is removed for photographing.
  • FIG. 7A shows a SEM image of the upper surface 1 b before the incision is made by the electrode unit 1 (before the incision).
  • FIG. 7A shows a SEM image of the upper surface 1 b before the incision is made by the electrode unit 1 (before the incision).
  • FIG. 7B shows a SEM image of the upper surface 1 b after the incision is performed by the electrode unit 1 under the same conditions as the SEM image of the above-described comparative example (after the incision).
  • the size of the display range of each SEM image is 60 ⁇ m ⁇ 45 ⁇ m.
  • the top surface 1b before the incision was substantially flat.
  • the upper surface 1b after the incision was also flat as before the incision. Therefore, it is considered that melting did not occur in the intermediate layer 1B made of tungsten.
  • the high frequency knife 10 and the electrode unit 1 can reduce the deterioration of the adhesion preventing performance of the living tissue even if a spark is generated during the treatment. For this reason, the service life of the high frequency knife 10 and the electrode part 1 improves.
  • FIG. 8 is a schematic cross-sectional view of an electrode for a high frequency medical device according to a modification of the embodiment of the present invention.
  • the high frequency knife 20 (high frequency medical device) of the present modification includes an electrode portion 21 (electrode for high frequency medical device) in place of the electrode portion 1 in the above embodiment.
  • the electrode unit 21 in the present modification includes a conductive adhesion preventing film 21C (metal layer) instead of the conductive adhesion preventing film 1C of the electrode unit 1 in the above embodiment.
  • a conductive adhesion preventing film 21C metal layer
  • the conductive antiadhesive film 21 ⁇ / b> C is configured to include a metal layer made of a metal material to which biological tissue is not easily attached.
  • the conductive antiadhesive film 1C may have a single-layer structure or a multi-layer structure.
  • a metal material to which biological tissue is less likely to adhere is used for the metal layer constituting the outer surface 21e.
  • an appropriate metal material capable of improving the adhesion between the metal layer constituting the outer surface 21e and the intermediate layer 1B is used as the metal layer between the metal layer constituting the outer surface 21e and the intermediate layer 1B. Is more preferred.
  • a metal material capable of improving the adhesion between the metal layer constituting the outer surface 21e and the intermediate layer 1B for example, a metal material constituting the metal layer constituting the outer surface 21e and a metal material constituting the intermediate layer 1B Alloys may be used.
  • a graded layer may be used in which the composition of the metal material constituting the metal layer constituting the outer surface 21e and the metal material constituting the intermediate layer 1B gradually or stepwise changes.
  • the conductive antiadhesive film 21C is formed.
  • the film formation method of the conductive antiadhesive film 21C include spray coating and dip coating.
  • the high frequency knife 20 according to this modification is different from the above embodiment only in that the conductive antiadhesive film 21C is formed of a metal layer. For this reason, on the surface of the electrode portion 21, the biological tissue hardly adheres by the action of the conductive adhesion preventing film 21C. Even if the conductive adhesion preventing film 21C is melted by the spark generated during use of the electrode portion 21, the intermediate layer 1B similar to the above embodiment is provided between the conductive adhesion preventing film 21C and the electrode main body 1A. It is provided.
  • the high frequency knife 20 and the electrode unit 21 according to the present modification can reduce the deterioration of the adhesion preventing performance of the living tissue even if a spark is generated at the time of treatment. Thereby, the service life of the high frequency knife 20 and the electrode part 21 improves.
  • a high frequency medical device is not limited to a high frequency knife.
  • treatment tools such as an electric scalpel, a high frequency knife, high frequency scissors, a snare, etc. are mentioned, for example.
  • Examples 1 to 18 of an electrode for a high frequency medical device corresponding to the above-described embodiment and modification will be described together with Comparative Examples 1 to 5.
  • the structure and evaluation result of the electrode part of each Example and each comparative example are shown by following [Table 1].
  • Example 1 is an example corresponding to the electrode unit 1 according to the above-described embodiment.
  • SUS304 which is stainless steel was used as a material of the electrode main body 1A which is a base material.
  • the shape of the electrode body 1A was a round bar having a diameter of 0.8 mm.
  • As the intermediate layer 1B (the reference numerals are omitted in [Table 1]. The same applies to the other members).
  • Tungsten (denoted as “W” in [Table 1]) with a layer thickness of 1 ⁇ m was used.
  • a silicone-based resin (denoted as "silicone” in [Table 1]) was used.
  • a conductive substance 6 of the conductive antiadhesive film 1C carbon black (denoted as “CB” in [Table 1]) was used.
  • the average particle size of carbon black was 25 nm.
  • the content of the conductive substance 6 in the conductive antiadhesive film 1C was 30 mass%.
  • the film thickness of the conductive antiadhesive film 1C was 20 ⁇ m.
  • the electrode unit 1 of Example 1 was manufactured as follows. After the electrode main body 1A was manufactured, a single-layer intermediate layer 1B made of tungsten was formed on the electrode main surface 1a of the electrode main body 1A. The intermediate layer 1B was deposited by sputtering. The layer thickness of the intermediate layer 1B was 1 ⁇ m. The base material 5 and the conductive substance 6 were mixed after curing so that the content of the conductive substance 6 became the above-mentioned value. Thus, a paint for forming the conductive antiadhesive film 1C was manufactured. The paint was spray-coated on the mid layer 1B. Thereafter, the coated film was dried at 220 ° C.
  • Example 1 a conductive antiadhesive film 1C was formed on the intermediate layer 1B. Thereby, the electrode part 1 of Example 1 was manufactured. After the wiring was connected to the electrode unit 1, the gripping unit 2 was attached. The wiring of the electrode unit 1 was electrically connected to the high frequency power supply 3 to which the counter electrode plate 4 was connected, and the high frequency knife 10 of Example 1 was manufactured.
  • the material of the electrode main body 1A is different from that of the first embodiment.
  • the electrode body 1A of Example 2 aluminum (denoted as “Al” in [Table 1]) was used.
  • the electrode portion 1 and the high frequency knife 10 of Examples 2 and 3 were manufactured in the same manner as Example 1 except that the material of the electrode main body 1A was different.
  • the material of the intermediate layer 1B is different from that of the first embodiment.
  • molybdenum (denoted as "Mo” in [Table 1]) was used.
  • tantalum (denoted as "Ta” in [Table 1]. ) was used.
  • niobium (denoted as "Nb” in [Table 1]) was used.
  • the electrode portion 1 and the high frequency knife 10 of Examples 4 to 6 were manufactured in the same manner as in Example 1 except that the material of the intermediate layer 1B was different.
  • Example 7 and 8 The seventh embodiment is different from the first embodiment in that the layer thickness of the intermediate layer 1B is 0.5 ⁇ m.
  • the eighth embodiment differs from the first embodiment in that the layer thickness of the intermediate layer 1B is 5 ⁇ m.
  • the electrode portion 1 and the high frequency knife 10 of Examples 7 and 8 were manufactured in the same manner as in Example 1 except that the layer thickness of the intermediate layer 1B was different.
  • the material of the base material 5 is different from the first embodiment.
  • silica which is a ceramic was used.
  • a fluorine-based resin was used.
  • the electroconductive substance 6 was mixed and manufactured with the silica coating material and fluorine coating material containing each component.
  • the electrode portion 1 and the high frequency knife 10 of Examples 9 and 10 were manufactured in the same manner as Example 1 except that the paint for forming the base material 5 of the conductive antiadhesive film 1C was different.
  • Examples 11 and 12 correspond to the electrode unit 21 of the above-described modified example.
  • a conductive adhesion preventing film 21C is provided in place of the conductive adhesion preventing film 1C in the first embodiment.
  • gold denoted as "Au” in [Table 1]
  • platinum denoted as "Pt” in [Table 1]
  • the layer thickness of each conductive adhesion preventing film 21C was 1 ⁇ m.
  • the electrode portion 21 and the high-frequency knife 20 of Examples 10 and 11 are the same as Example 1 except that the metal layer of the above-described conductive adhesion preventing film 1C is formed by plating as the conductive adhesion preventing film 21C. manufactured.
  • Example 13 to 15 the material of the conductive substance 6 is different from that in Example 1.
  • gold particles having an average particle diameter of 25 nm (denoted as “Au particles” in [Table 1]) were used.
  • silver particles having an average particle diameter of 40 nm (denoted as "Ag particles” in [Table 1]) were used.
  • nickel particles having an average particle diameter of 30 nm (denoted as "Ni particles” in [Table 1]) were used.
  • the electrode portion 1 and the high frequency knife 10 of Examples 13 to 15 are manufactured in the same manner as Example 1 except that the material of the conductive substance 6 contained in the paint for forming the conductive antiadhesive film 1C is different. It was done.
  • Example 16 to 18 In Examples 16 to 18, the content of the conductive substance 6 is different from that in Example 1.
  • the content rates of the conductive substance 6 in Examples 16 to 18 were 5 mass%, 10 mass%, and 20 mass%, respectively.
  • the electrode portion 1 and the high frequency knife 10 of Examples 16 to 18 are the same as Example 1 except that the amount of the conductive substance 6 contained in the paint for forming the conductive antiadhesive film 1C is different. manufactured.
  • Comparative Examples 1 to 5 The comparative examples 1 to 5 will be described focusing on differences from the above-described example.
  • Comparative Example 1 is an example in which the intermediate layer 1B is deleted in Example 1 described above.
  • Comparative Examples 2 to 4 are examples in which the material of the intermediate layer 1B is changed in the above-mentioned Example 1.
  • gold denoted as "Au” in [Table 1]
  • TiAlSiN titanium aluminum silicon nitride
  • TiAlSiN titanium aluminum silicon nitride
  • Comparative Example 4 chromium nitride (CrN) was used instead of tungsten.
  • the melting point of CrN is 800.degree.
  • Comparative Example 5 is an example where the conductive substance 6 is eliminated in Example 1 above.
  • the antiadhesive film was made of silicone resin having a layer thickness of 5 ⁇ m.
  • the adhesion prevention evaluation of the biological tissue in the electrode part of Examples 1-18 and Comparative Examples 1-5 was performed.
  • the adhesion prevention evaluation was performed by measuring the change over time of the incision performance of the electrode portion. This is because when the adhesion of the living tissue to the electrode occurs, it becomes difficult to conduct electricity and the incision property is reduced.
  • a predetermined incision operation described later was repeated.
  • Pig stomach was used as the treatment object.
  • the incision operation of the mucous membrane layer and submucosal layer of a treated object was performed repeatedly using the electrode part of each example and each comparative example.
  • One incision operation was performed under the conditions of an incision mode, an output of 50 W, and an incision distance of 10 mm. This cutting operation was performed 500 times for each electrode unit. At the 500th incision, the time taken to make a 10 mm incision (dissection time) was measured.
  • Table 1 describes the dissection time and the evaluation of anti-sticking evaluation.
  • the incision time is within 5 seconds, the incision is good. Therefore, it was evaluated as "good” (good, described as “o” in [Table 1]) as the adhesion preventing property of the living tissue.
  • the incision time exceeds 5 seconds, the incision property is poor. Therefore, it was evaluated as “poor” (denoted as "x” in [Table 1]) as the adhesion preventing property of the living tissue.
  • [Table 1] the incision time by each of the electrode parts in Examples 1-6, 9, 10 was 3 seconds.
  • the incision time by each electrode unit of Examples 7, 8, 11 to 15, 17, and 18 was 4 seconds.
  • the incision time by the electrode part of Example 16 was 5 seconds. For this reason, the adhesion preventing properties of the electrode portions in Examples 1 to 18 were all evaluated as “good”.
  • the dissection times by the electrode parts of Comparative Examples 1 to 4 were 30 seconds, 20 seconds, 20 seconds, and 30 seconds, respectively. For this reason, the adhesion preventing properties of the electrode parts of Comparative Examples 1 to 4 were all evaluated as “defective”.
  • the anti-adhesion film of the electrode portion of Comparative Example 5 did not have conductivity, so it was not possible to incise the treatment object even in the initial state. For this reason, Comparative Example 5 was evaluated as "defective".
  • the comparative example 1 had the configuration of the comparative example shown in FIG. 4A and FIG. 4B, so as described above, it is considered that as a result of melting of the electrode main body 1A, the biological tissue adheres and the dissection property decreases.
  • the dissection property has decreased.
  • an electrode for a high frequency medical device and a high frequency medical device capable of reducing the deterioration of the adhesion preventing performance of a living tissue even if a spark occurs at the time of treatment.
  • Electrode part (electrode for high frequency medical equipment) 1a Electrode Body Surface 1A Electrode Body (Base Material) 1b top surface 1B middle layer 1C conductive antiadhesive film 1e, 21e outer surface 1f rough surface 5 base material (non-metallic material) 6 Conductive substance 10, 20 High frequency knife (high frequency medical equipment) 21C Conductive adhesion prevention film (metal layer)

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  • Biomedical Technology (AREA)
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  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
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Abstract

Une unité d'électrode (1) comprend : un corps d'électrode (1A); une couche intermédiaire (1B) stratifiée sur le corps d'électrode (1A) et comprenant un premier matériau métallique ayant un point de fusion plus élevé que le point de fusion d'au moins le corps d'électrode (1A); et un film conducteur anti-adhérence (1C) stratifié sur la couche intermédiaire (1B).
PCT/JP2018/038715 2017-10-18 2018-10-17 Électrode pour équipement médical à haute fréquence et équipement médical à haute fréquence Ceased WO2019078275A1 (fr)

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JP2017201785A JP6856492B2 (ja) 2017-10-18 2017-10-18 高周波医療機器用の電極および高周波医療機器

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015521873A (ja) * 2012-07-03 2015-08-03 クレオ・メディカル・リミテッドＣｒｅｏ Ｍｅｄｉｃａｌ Ｌｉｍｉｔｅｄ 電気外科用切除器具
WO2017130383A1 (fr) * 2016-01-29 2017-08-03 オリンパス株式会社 Instrument de traitement haute fréquence
WO2017145842A1 (fr) * 2016-02-22 2017-08-31 オリンパス株式会社 Film antiadhésif pour dispositifs médicaux et dispositif médical

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015521873A (ja) * 2012-07-03 2015-08-03 クレオ・メディカル・リミテッドＣｒｅｏ Ｍｅｄｉｃａｌ Ｌｉｍｉｔｅｄ 電気外科用切除器具
WO2017130383A1 (fr) * 2016-01-29 2017-08-03 オリンパス株式会社 Instrument de traitement haute fréquence
WO2017145842A1 (fr) * 2016-02-22 2017-08-31 オリンパス株式会社 Film antiadhésif pour dispositifs médicaux et dispositif médical

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