Cautery puncture needle

Abstract

The present invention provides a cauterizing puncture needle that allows easy fine adjustment of the degree of bending of the cauterizing puncture needle. The cauterizing puncture needle (1) includes a tube portion and a front electrode portion (10) provided at the front end of the tube portion and through which high-frequency current is passed. The tube portion has a first bent portion and a second bent portion. The first bent portion is located at the front end side of the tube portion. The second bent portion is located at the base end side of the tube portion. The first bent portion and the second bent portion are configured such that the radius of curvature (R1) of the arc of the first bent portion is equal to or longer than the radius of curvature (R2) of the arc of the second bent portion, and the arc of the first bent portion is longer than the arc of the second bent portion. Alternatively, the first bent portion and the second bent portion are configured such that the arc of the first bent portion is equal to or longer than the arc of the second bent portion, and the radius of curvature (R1) of the arc of the first bent portion is longer than the radius of curvature (R2) of the arc of the second bent portion.

Description

Technical Field

[0001] This invention relates to cauterization puncture needles. Background Technology

[0002] Previously, as shown in Patent Document 1, a puncture needle comprising two curved sections was proposed.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2013-220202 Summary of the Invention

[0006] The problem that the invention aims to solve

[0007] However, users such as doctors need skilled techniques to adjust the curvature of the puncture needle.

[0008] Therefore, one of the objectives of this invention is to facilitate fine-tuning of the bending degree of the cauterization puncture needle.

[0009] Methods for solving problems

[0010] A cauterization puncture needle according to one embodiment of the present invention includes a tube and a front electrode portion disposed at the front end of the tube and through which a high-frequency current is transmitted. The tube has a first bend and a second bend. The first bend is located at the front end side of the tube. The second bend is located at the base end side of the tube. The first bend and the second bend are configured such that the radius of curvature of the arc of the first bend is greater than or equal to the radius of curvature of the arc of the second bend, and the arc of the first bend is longer than the arc of the second bend. Alternatively, the first bend and the second bend are configured such that the arc of the first bend is greater than or equal to the arc of the second bend, and the radius of curvature of the arc of the first bend is longer than the radius of curvature of the arc of the second bend.

[0011] The effects of the invention

[0012] As described above, according to the present invention, the degree of bending of the cauterization puncture needle can be easily adjusted. Attached Figure Description

[0013] Figure 1 This is a side view of the cauterization puncture needle and operating part of this embodiment.

[0014] Figure 2 This is an enlarged side view of the area including the first region and the second region of the cauterization puncture needle in this embodiment.

[0015] Figure 3 This is a diagram showing the front electrode section, the first tube, and the second tube before bending, along with side and partial cross-section views.

[0016] Figure 4 This is a diagram showing the side and partial cross-section of the front electrode section and the first tube.

[0017] Figure 5 This is a diagram showing the cross-sectional structure of the cauterization puncture needle before bending.

[0018] Figure 6 This is an enlarged side view of the cauterization puncture needle in this embodiment.

[0019] Figure 7 It is a diagram showing the front electrode section before bending, the side and partial cross-section of the first tube and the second tube, and a diagram showing a joint example including both bonding and spot welding. Detailed Implementation

[0020] The following description uses accompanying drawings to illustrate this embodiment (see attached drawings). Figures 1-6 It should be noted that the implementation methods are not limited to the following. Furthermore, the content described in one implementation method generally applies to other implementation methods as well. Additionally, the various implementation methods and variations can be appropriately combined.

[0021] To illustrate the internal structure of the first tube 21, etc. Figure 2 The first tube 21 and the second tube 22, which are not visible from the outside due to being covered by the covering part 40, are shown in dashed lines. To illustrate the internal structure of the first tube 21, Figure 3 The first tube 21, which is not visible from the outside due to being obscured by the second tube 22, is shown in dashed lines. To illustrate the internal structure of the first tube 21, etc., Figure 5 The length of regions 2a2 to 7a7 is shortened to show regions 1a1 to 7a7.

[0022] (Composition of cauterization puncture needle 1)

[0023] like Figure 1 As shown, the cauterization puncture needle 1 of this embodiment includes a front electrode portion 10, tube portions (first tube 21, second tube 22), and a covering portion 40. An operating portion 50, such as a Luer connector 51, is mounted on the base end side of the cauterization puncture needle 1. The cauterization puncture needle 1 is used for catheter ablation (myocardial ablation) and the like, in which a high-frequency current is introduced into the abnormal portion of the body for cauterization. It should be noted that in this embodiment, the first tube 21 and the second tube 22 are covered by the opaque covering portion 40, and are therefore located in a position not visible from the outside. However, the covering portion 40 may also be transparent rather than opaque.

[0024] (Front-end electrode section 10)

[0025] like Figure 2As shown, the front electrode portion 10 is provided at the front end of the first tube 21. The front electrode portion 10 is integrally formed with the first tube 21 by arc welding such as plasma welding or Tig (Tungsten Insert Gas) welding. The front electrode portion 10 is configured to generate Joule heating by passing a high-frequency current. Preferably, the insertion front end shape of the front electrode portion 10 is a semi-elliptical sphere (a shape that cuts the center of a projectile or rugby ball along its length) with the outer diameter gradually decreasing towards the front end. The insertion front end shape of the front electrode portion 10 is not limited to this; for example, it can also be hemispherical. A cylindrical portion 11 communicating with the first tube 21 is provided at the base end of the front electrode portion 10. A hole 11a is formed on the cylindrical portion 11. The hole 11a is used as a spray hole for spraying contrast agent. The hole 11a is formed by laser processing or the like.

[0026] The front electrode section 10 is made of metal to allow high-frequency current to flow in. The front electrode section 10 is preferably made of metals that can be photographed with high contrast under X-ray fluoroscopy, such as platinum, iridium, alloys of platinum and iridium, and alloys of platinum, iridium, and stainless steel, so that the location of the surgical site can be easily identified.

[0027] It should be noted that, in this embodiment, the cylindrical portion 11 is formed on the base end side of the front electrode portion 10, but it can also be formed on the front end side of the first tube 21.

[0028] (Pipe 1, 21)

[0029] like Figure 3 , Figure 4 As shown, the first tube 21 is a hollow cylindrical tube. The first tube 21 communicates with the cylindrical portion 11 of the front electrode portion 10 at its front end and with the second tube 22 at its base end. That is, the front electrode portion 10 is provided at the front end of the first tube 21. The first tube 21 extends from the region connected to the front electrode portion 10 through the inside of the second tube 22 to the region near the terminal portion of the base end of the straight region of the second tube 22 (the second region a2 to the fifth region a5 described later).

[0030] On the outer surface of the front end of the first tube 21, in the area not inserted into the inner side of the second tube 22, a pear-skin-like surface treatment is applied by sandblasting or the like. Specifically, the entire area of ​​the outer surface of the first tube 21 covered by the coating portion 40 (described later) is treated with a pear-skin-like surface treatment. The first tube 21 is made of a flexible metal such as stainless steel (SUS302, SUS304V, SUS316L), nickel-titanium alloy, CoCr, or other alloys.

[0031] (Pipe 22)

[0032] like Figure 5As shown, the second tube 22 is a hollow cylindrical tube. The second tube 22 has an inner diameter that is the same as or slightly larger than the outer diameter of the first tube 21. The second tube 22 communicates with the first tube 21 at its front end and with the operating part 50 at its base end. The second tube 22 extends from the region near the front electrode part 10 to the region where the operating part 50 is located (regions a3 to a7 described later).

[0033] The outer surface of the second tube 22 is treated with a pear-skin-like surface by sandblasting or other processes.

[0034] Specifically, the area covered by the coating portion 40 on the outer surface of the second tube 22 is subjected to a pear-skin-like surface treatment throughout. The second tube 22 is made of a flexible metal such as stainless steel (SUS302, SUS304V, SUS316L, etc.), nickel-titanium alloy, CoCr, etc.

[0035] The first tube 21 is inserted into the inner side of the second tube 22 from the front end side. The first tube 21 and the second tube 22 are joined together by laser welding, bonding, etc. to form a tube section. The front end side (second region a2) of this tube section is composed of a single layer of the first tube 21, the base end side (sixth region a6 and seventh region a7) is composed of a single layer of the second tube 22, and the area between the front end side and the base end side (third region a3 to fifth region a5) is composed of two layers of the first tube 21 and the second tube 22.

[0036] (Grit size of the grinding wheel used in sandblasting)

[0037] According to the JIS grit size designation, the grit size of the grinding wheels used in the sandblasting of the first tube 21 and the second tube 22 is preferably set to approximately 80 mesh (the grit size of a sieve that divides a 1-inch square into 80 parts, but not a sieve that divides a 1-inch square into 100 parts). It should be noted that the grit size of the grinding wheels used in the sandblasting process is not limited to this.

[0038] (covered part 40)

[0039] The outer surface of the front end of the first tube 21, which is not inserted into the inner side of the second tube 22, and the outer surface of the second tube 22 are covered by a cover portion 40. The cover portion 40 is used to prevent accidental high-frequency ablation of blood vessels, organs, etc., and to reduce the sliding resistance of the ablation puncture needle 1 within the body. The cover portion 40 is made of a hydrophobic resin material such as PTFE (polytetrafluoroethylene), ETFE (tetrafluoroethylene-ethylene copolymer), PFA (tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer), or other fluoropolymers. The cover portion 40 is made of a heat-shrinkable tube, which shrinks to fit tightly against the tube by heating after the tubes (the first tube 21 and the second tube 22) are inserted into the heat-shrinkable tube.

[0040] (Operations Department 50)

[0041] The operating section 50 at the base end of the second tube 22 includes a Luer connector 51, a repeater cable 53, and a syringe connection 55 (see...). Figure 1 The relay cable 53 electrically connects the high-frequency (radio wave (RF)) current generation source to the second tube 22, the first tube 21, and the front electrode section 10. The syringe connection section 55 is a Luer cone-shaped fitting part that connects to the syringe. By connecting the syringe filled with contrast agent to the syringe connection section 55, the contrast agent is injected into the first hollow section 21a and the second hollow section 22a, thereby spraying the contrast agent to the outside through the hole 11a formed in the barrel section 11 of the front electrode section 10 (see...). Figure 5 ).

[0042] (Outer diameter of each part)

[0043] The front electrode section 10, the first tube 21, and the covering section 40 are configured such that the outer diameter d1 of the front electrode section 10 is greater than the outer diameter d2 of the first tube 21 and smaller than the outer diameter d3 of the area of ​​the covering section 40 that covers the first tube 21 (see [reference]). Figures 2-5 For example, d1 = 0.75 mm, d2 = 0.70 mm, d3 = 0.83 mm). That is, the configuration is such that the relationship d2 < d1 < d3 holds. Here, the outer diameter d1 of the front electrode part 10 is defined as the outer diameter of the largest part of the outer diameter of the semi-ellipsoidal or hemispherical base end side portion and the cylindrical part 11.

[0044] (The structure of the bend)

[0045] The cauterization puncture needle 1 has two curved sections between the front electrode section 10 and the base end side of the second tube 22 (see...). Figure 1 , Figure 6 For the sections (first tube 21 and second tube 22) that are formed in a generally straight shape and are covered by the covering part 40, the two curved sections are formed by bending the corresponding parts (fourth region a4 and sixth region a6).

[0046] The bending portion is formed after the front electrode portion 10 is installed on the first tube 21, the first tube 21 is installed on the second tube 22, the covering portion 40 is installed on the first tube 21 and the second tube 22, and the second tube 22 is installed on the operation portion 50.

[0047] It should be noted that the bending portion can also be formed after the first tube 21 is installed on the second tube 22 and the covering portion 40 is installed on the first tube 21 and the second tube 22, and before the installation of the front electrode portion 10 on at least one of the operation portion 50 on the first tube 21 and the second tube 22.

[0048] Specifically, the cauterization puncture needle 1 has regions a1 to a7, with curved portions formed in regions a4 and a6. Region a1 is the region where the front electrode portion 10 is provided. Region a2 is a region consisting of a single layer of the first tube 21. Region a3 is a region consisting of two layers of the first tube 21 and the second tube 22, and is a straight region on the front end side (first straight portion). Region a4 is a region consisting of two layers of the first tube 21 and the second tube 22, and is a curved region (first curved portion). Region a5 is a region consisting of two layers of the first tube 21 and the second tube 22, and is a straight region on the base end side (second straight portion). Region a6 is a region consisting of a single layer of the second tube 22, and is a curved region (second curved portion). Region a7 is a region consisting of a single layer of the second tube 22, and is a straight region (third straight portion).

[0049] It should be noted that the fifth region a5 is preferably composed of two layers, the first tube 21 and the second tube 22, but it can also be composed of a single layer of only the second tube 22.

[0050] The first bend is located in the region formed by two layers of the first tube 21 and the second tube 22. The second bend is located in the region formed by a single layer of the second tube 22. That is, the tube section (first tube 21 and second tube 22) is constructed such that the region forming the first bend is thicker than the region forming the second bend. Because the first bend is formed in the region formed by two layers of the first tube 21 and the second tube 22, it is easier to maintain the shape of the bend compared to the second bend formed in the region formed by a single layer of the second tube 22. On the other hand, the second bend is formed in the region formed by a single layer of the second tube 22, and therefore, compared to the first bend, it is easier to bend under external force.

[0051] The two curved sections (region 4 a4 and region 6 a6) bend in the same direction. Region 4 a4 and region 6 a6 are configured such that the radius of curvature R1 of the arc in region 4 a4 is greater than or equal to the radius of curvature R2 of the arc in region 6 a6, and the arc in region 4 a4 is longer than the arc in region 6 a6. Specifically, the configuration is such that the relationship R1 ≥ R2 (e.g., R1 = R2 = 63.6 mm) and the arc length of a4 > the arc length of a6 (e.g., arc length of a4 = 34.6 mm, arc length of a6 = 20.6 mm) holds true. Alternatively, region 4 a4 and region 6 a6 are configured such that the arc length of region 4 a4 is greater than or equal to the arc length of region 6 a6, and the radius of curvature R1 of the arc in region 4 a4 is longer than the radius of curvature R2 of the arc in region 6 a6. That is, the configuration is such that the arc length of a4 ≥ the arc length of a6, and the relationship R1 > R2 holds true.

[0052] It should be noted that the difference in bending angle between the first and second bends is preferably within the range of, for example, 5 to 20 degrees.

[0053] The three straight sections (region a3, region a5 and region a7) extend in a generally straight line.

[0054] The term "generally straight" as used here refers not only to extending in a straight line, but also to a shape that curves gently with a radius of curvature longer than the radius of curvature R1 of the arc in region 4 a4 and the radius of curvature R2 of the arc in region 6 a6.

[0055] (The effect of setting two curved sections with different configurations)

[0056] Regions a4 (4th region) and a6 (6th region) are configured such that region a4 has a longer arc length and / or a longer radius of curvature compared to region a6. Therefore, stress concentration occurs in region a6 (6th region) on the base side compared to other regions, including region a4. Region a6 (2nd bend) is more easily bent than other parts, allowing users such as doctors to easily fine-tune the degree of bending. Furthermore, region a4 (1st bend) easily maintains its bent state, making it less prone to accidental bending during surgery or similar procedures.

[0057] Furthermore, region 4 a4 (the first bending section) consists of two layers: the first tube 21 and the second tube 22. Region 6 a6 (the second bending section) consists of a single layer of the second tube 22. Therefore, region 6 a6 is easier to bend than region 4 a4, making it easier for users such as doctors to fine-tune the degree of bending. Conversely, region 4 a4, which is more difficult to bend than region 6 a6, is easier to maintain its bent state. Therefore, it is less prone to accidental bending during surgery or similar procedures.

[0058] (The effect of surface treatment on the entire area covered by the coating part 40 of the second tube 22, etc.)

[0059] For the entire area covered by the sheath of the first tube 21 and the second tube 22, a pear-skin-like surface treatment is applied so that the first tube 21 and the like fit snugly against the sheath 40, and the sheath 40 is less prone to wrinkling. Therefore, the insertion of the cauterization puncture needle 1 into the sheath can be performed smoothly.

[0060] (The effect of increasing the outer diameter d1 of the front electrode section 10)

[0061] By making the outer diameter d1 of the front electrode portion 10 larger than the outer diameter d2 of the first tube 21, the electrode surface area of ​​the front electrode portion 10 can be increased compared to making it the same as the outer diameter d2 of the first tube 21. Increasing the electrode surface area enables electrically stable ablation and facilitates puncture into the desired area. Furthermore, because the layer difference between the front electrode portion 10 and the covered portion 40 is small, it is less likely for the covered portion 40 to peel off or curl up.

[0062] (The effect of having a straight section between two curved sections)

[0063] A fifth region a5 (second straight section) is provided between the fourth region a4 (first curved section) and the sixth region a6 (second curved section). By providing a straight section between the two curved sections, the position of the desired curved area (fourth region a4) can be easily visually identified through fine adjustments. Furthermore, since the fifth region a5 (second straight section) is composed of two layers, the first tube 21 and the second tube 22, it is less prone to bending compared to a region composed of a single layer. Therefore, the fifth region a5 is easier to maintain a straight state and is less likely to be accidentally bent during surgery or similar procedures.

[0064] (Application example of the connection between tube 21 and tube 22)

[0065] The connection between the first pipe 21 and the second pipe 22 can also be achieved through both bonding and welding. For example, as... Figure 7 As shown, the front end sides (including the areas of the third region a3 and the fourth region a4 and the bonding region b1) of the first tube 21 and the second tube 21 are joined by adhesive bonding, and the base end side (the fifth region a5) is joined by spot welding. Adhesion bonding is also to prevent leakage of contrast agents, etc. Spot welding is performed both to reliably achieve electrical conductivity up to the front electrode portion 10 and to prevent the joint between the first tube 21 and the second tube 22 from detaching. The spot weld is formed on the surface including the neutral surface NP of at least one of the first bend (the fourth region a4) and the second bend (the sixth region a6). Figure 7 An example is shown where spot welding is performed on the neutral face NP at three locations s1, s2, and s3 in region 5a5. The joint is first bonded on the front end side, and then spot welded on the base end side.

[0066] Several embodiments of the present invention have been described, but these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in many other ways, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their variations are included in the scope and spirit of the invention, and are equally included in the scope of the invention as described in the claims and its equivalents.

[0067] According to this instruction manual, the following solutions are provided.

[0068] (Option 1)

[0069] The cauterization puncture needle includes a tube and a front electrode portion disposed at the front end of the tube and through which a high-frequency current is transmitted. The tube has a first bend and a second bend. The first bend is located at the front end of the tube. The second bend is located at the base end of the tube. The first and second bends are configured such that the radius of curvature of the arc of the first bend is greater than or equal to the radius of curvature of the arc of the second bend, and the arc of the first bend is longer than the arc of the second bend. Alternatively, the first and second bends are configured such that the arc of the first bend is greater than or equal to the arc of the second bend, and the radius of curvature of the arc of the first bend is longer than the radius of curvature of the arc of the second bend.

[0070] According to Scheme 1, the first bend and the second bend are configured such that, compared to the second bend, the first bend has a longer arc length and / or a longer radius of curvature. Therefore, compared to other areas including the first bend, stress is concentrated on the base side of the second bend. The second bend is easier to bend than other parts, allowing users such as doctors to easily fine-tune the degree of bending. Furthermore, the first bend is easier to maintain its bent state, making it less prone to accidental bending during surgery or similar procedures.

[0071] (Option 2)

[0072] The preferred tube section has a first tube and a second tube. A front electrode section is provided on the front end side of the first tube. The base end side of the first tube is inserted into the second tube. A first bend is located in the region formed by the two layers of the first and second tubes. A second bend is located in the region formed by a single layer of the second tube.

[0073] According to Option 2, the second bend is easier to bend than the first bend, allowing doctors and other users to easily fine-tune the degree of bending. Furthermore, the first bend, which is more difficult to bend than the second bend, is easier to maintain its bent state. Therefore, it is less prone to accidental bending during surgery or similar procedures.

[0074] (Option 3)

[0075] Further preferably, the cauterization puncture needle has a covering portion that covers the tube portion. At least one of the outer surfaces of the first tube and the second tube is covered by the covering portion. A pear-skin-like surface treatment is performed over the entire area covered by the covering portion.

[0076] According to Scheme 3, the entire area covered by the sheath in the first and second tubes is treated with a pear-skin-like surface, so that the first tube and the others fit tightly against the sheath, and wrinkles are less likely to form in the sheath. Therefore, the insertion of the cauterization puncture needle into the sheath can be performed smoothly.

[0077] (Option 4)

[0078] It is further preferred that the outer diameter of the front electrode portion is larger than the outer diameter of the first tube, and smaller than the outer diameter of the area of ​​the covered portion that covers the first tube.

[0079] According to Scheme 4, by making the outer diameter of the front electrode portion larger than the outer diameter of the first tube, the electrode surface area of ​​the front electrode portion can be increased compared to making it the same as the outer diameter of the first tube. By increasing the electrode surface area, electrically stable ablation can be achieved, and puncture into the desired area can be easily performed. In addition, since the layer difference between the front electrode portion and the covered portion is small, it is difficult for the covered portion to peel off or curl up.

[0080] (Option 5)

[0081] Further preferably, the tube has a straight section between the first bend and the second bend. The straight section is located in the region formed by the two layers of the first tube and the second tube.

[0082] According to the proposed solution, by providing a straight section between the two curved sections, the location of the desired curved area (the second curved section) can be easily identified visually through fine adjustments. Furthermore, since this straight section is composed of two layers—the first tube and the second tube—it is less prone to bending compared to areas composed of a single layer. Therefore, this straight section is easier to maintain a straight position and is less likely to be accidentally bent during surgery or similar procedures.

[0083] (Option 6)

[0084] It is further preferred that the first tube and the second tube be joined by bonding on the front end side and spot welding on the base end side.

[0085] According to Scheme 6, leakage of liquid passing through the inside of the first tube can be prevented by bonding on the front end side. In addition, electrical conduction to the front electrode can be reliably achieved by spot welding on the base end side, and the first tube and the second tube are difficult to detach.

[0086] Explanation of reference numerals in the attached figures

[0087] 1. Burning puncture needle, 10. Front electrode section, 11. Cylindrical section

[0088] 11a Hole, 21 First Tube, 21a First Hollow Section, 22 Second Tube, 22a Second Hollow Section, 40 Coating Layer, 50 Operating Section, 51 Luer Connector, 53 Relay Cable, 55 Syringe Connection Section, a1 First Region, a2 Second Region, a3 Third Region (First Straight Section), a4 Fourth Region (First Bending Section), a5 Fifth Region (Second Straight Section), a6 Sixth Region (Second Bending Section), a7 Seventh Region (Third Straight Section), b1 Bonding Region, d1 Outer Diameter of Front Electrode Section, d2 Outer Diameter of First Tube, d3 Outer Diameter of the Coated Region of the First Tube, NP Mid-face of at least one of the First Bending Section and the Second Bending Section, s1 to s3 Spot Welding Areas

Claims

1. A cauterization puncture needle, characterized in that, include: Department; as well as The front electrode section, located at the front end of the tube, is through which a high-frequency current is passed. The tube has a first bend and a second bend. The first bend is located on the front end side of the tube. The second bend is located at the base end of the tube. The first curved portion and the second curved portion are configured such that the radius of curvature of the arc of the first curved portion is greater than or equal to the radius of curvature of the arc of the second curved portion, and the arc of the first curved portion is longer than the arc of the second curved portion. Alternatively, the first curved portion and the second curved portion are configured such that the arc of the first curved portion is longer than or equal to the arc of the second curved portion, and the radius of curvature of the arc of the first curved portion is longer than the radius of curvature of the arc of the second curved portion. The tubular section has a first tube and a second tube. The front electrode portion is provided on the front end side of the first tube. The base end of the first tube is inserted into the second tube. The first bend is located in the region formed by the two layers of the first tube and the second tube. The second bend is located in the region consisting of a single layer of the second tube.

2. The cauterization puncture needle according to claim 1, characterized in that, It further includes a covering portion that covers the tube portion. At least one of the outer surfaces of the first tube and the second tube is covered by the covering portion. A pear-skin-like surface treatment is applied to the entire area covered by the coating.

3. The cauterization puncture needle according to claim 2, characterized in that, The outer diameter of the front electrode portion is larger than the outer diameter of the first tube, but smaller than the outer diameter of the area of ​​the covered portion that covers the first tube.

4. The cauterization puncture needle according to any one of claims 1 to 3, characterized in that, The tube has a straight section between the first bend and the second bend. The straight section is located in the region formed by the two layers of the first tube and the second tube.

5. The cauterization puncture needle according to any one of claims 1 to 3, characterized in that, The first tube and the second tube are joined by bonding on the front end and spot welding on the base end.

6. The cauterization puncture needle according to claim 4, characterized in that, The first tube and the second tube are joined by bonding on the front end and spot welding on the base end.

7. The cauterization puncture needle according to any one of claims 1 to 3, characterized in that, The insertion tip of the front electrode is shaped like a semi-ellipsoid.

8. The cauterization puncture needle according to claim 4, characterized in that, The insertion tip of the front electrode is shaped like a semi-ellipsoid.

9. The cauterization puncture needle according to claim 5, characterized in that, The insertion tip of the front electrode is shaped like a semi-ellipsoid.

10. The cauterization puncture needle according to any one of claims 1 to 3, characterized in that, The front electrode section has a cylindrical section that communicates with the tube section. The cylindrical part is provided with holes.

11. The cauterization puncture needle according to claim 4, characterized in that, The front electrode section has a cylindrical section that communicates with the tube section. The cylindrical part is provided with holes.

12. The cauterization puncture needle according to claim 5, characterized in that, The front electrode section has a cylindrical section that communicates with the tube section. The cylindrical part is provided with holes.

13. The cauterization puncture needle according to any one of claims 1 to 3, characterized in that, The front electrode section is made of a metallic material that is difficult for X-rays to penetrate.

14. The cauterization puncture needle according to claim 4, characterized in that, The front electrode section is made of a metallic material that is difficult for X-rays to penetrate.

15. The cauterization puncture needle according to claim 5, characterized in that, The front electrode section is made of a metallic material that is difficult for X-rays to penetrate.

16. The cauterization puncture needle according to any one of claims 1 to 3, characterized in that, The first curved portion and the second curved portion are curved in the same direction.

17. The cauterization puncture needle according to claim 4, characterized in that, The first curved portion and the second curved portion are curved in the same direction.

18. The cauterization puncture needle according to claim 5, characterized in that, The first curved portion and the second curved portion are curved in the same direction.

19. The cauterization puncture needle according to any one of claims 1 to 3, characterized in that, The difference in bending angle between the first curved portion and the second curved portion is in the range of 5 degrees to 20 degrees.

20. The cauterization puncture needle according to claim 4, characterized in that, The difference in bending angle between the first curved portion and the second curved portion is in the range of 5 degrees to 20 degrees.

21. The cauterization puncture needle according to claim 5, characterized in that, The difference in bending angle between the first curved portion and the second curved portion is in the range of 5 degrees to 20 degrees.

22. The cauterization puncture needle according to claim 2 or 3, characterized in that, The coating is made of a hydrophobic resin material.

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