KR100973307B1 - Bipolar electrode guide wire and catheter system using same - Google Patents

Abstract

The present invention relates to a medical guide wire and a catheter system using the same. The bipolar electrode type guide wire according to the present invention is formed as an electrically conductive material, and is made of a first wire and an electrically conductive material which are inserted into a hollow catheter inserted into a tubular organ of a living body so that both ends thereof protrude from the catheter. And a second wire having a main line portion formed to be long and spaced apart from the first wire, and a coil portion extending in a spiral form from the main line portion to insert a first wire therein, wherein the first wire and the second wire are provided. The first wire and the second wire are electrically insulated except for each of the front end portions of the wire, and the front end portion of the first wire and the front end portion of the second wire are spaced apart from each other by a predetermined distance.

Catheter, guide wire

Description

Bipolar electrode type guide wire and Catheter system using the same

The present invention relates to a guide wire and a catheter system using the same, and more particularly, to perform high frequency heat treatment such as vascular occlusion, tumor removal, coronary structure occlusion, fistula occlusion, and short cut (shunt, short) occlusion. It relates to a guide wire and a catheter system using the same.

In various cases, such as vascular malformation such as arteriovenous malformation or bleeding diseases caused by organ rupture, occlusion or embolization that blocks the blood vessels at the bleeding site is necessary. .

Conventional embolization generally occludes blood vessels using embolic materials such as polyvinyl alcohol, gel foam, anhydrous ethanol, microspheres, coils, balloon separation. That is, the catheter was inserted along the blood vessel to the affected site, and then the vessel was occluded by injecting an embolic material into the affected area through the catheter.

However, when the blood vessel is occluded using the embolic material, there may be a side effect of using the embolic material. In other words, embolism can be reversed to block adjacent normal blood vessels, and when it enters the vein, it can block pulmonary artery and cause itrogenic embolism.

On the other hand, many methods of occluding the blood vessels through radiofrequency ablation (RFA), which occludes blood vessels by using a high frequency current without using embolic materials. FIG. 1 is a schematic diagram illustrating high frequency thermal therapy using a catheter, and FIG. 2 is a view for explaining high frequency thermal therapy performed using a catheter and an electrode for a patient who has a bleeding disease caused by a traumatic kidney injury. As a photograph, FIG. 2A is a state before treatment, FIG. 2B is a state where a catheter and a guide wire are inserted, and FIG. 2C is a state after treatment.

In order to perform radiofrequency ablation, a catheter (c) is first inserted into the patient's body, and the proximal segment of the catheter is approached through the blood vessel to the area where the lesion has occurred. Inserting the catheter (c) through the blood vessels is a very delicate process and is done through an angiographic fluoroscopy system. When the proximal end of the catheter (c) reaches the lesion, a high frequency current is applied to the lesion by applying power to a high frequency generator (not shown), which will be described in more detail. The catheter c has a hollow shape, and a lumen (not shown) is formed therein. A guide wire (not shown) is coaxially inserted into the lumen of the catheter c, and the distal end thereof is catheter (not shown). It protrudes and exposes about c). Therefore, when the proximal end of the catheter c reaches the region where the lesion is generated, the proximal end of the guide wire is also located in the same region. The guide wire is a metal material and is electrically connected to the high frequency generator. On the other hand, a ground pad (not shown) is attached to the patient's body (outer skin), which is also electrically connected to the high frequency generator. When power is applied to the high frequency generator, a path of current flow from the guide wire to the ground pad is formed. In this process, the friction energy caused by the vibration of the ions raises the temperature of the tissue, inducing coagulation necrosis, thereby occluding the blood vessel.

Figure 2a is a case of rupture of the kidney and false aneurysm of the kidney artery due to trauma. It can be seen that there is a large amount of bleeding in the region indicated by reference numeral b in FIG. 2A by the trauma. In FIG. 2B, the bleeding region is reached through the blood vessel while the guide wire w is inserted into the catheter c. Radio frequency heat treatment was performed in this region using high frequency current, and the result is shown in FIG. 2C. have. Looking at Figure 2c, unlike in Figure 2a it can be seen that the bleeding has stopped and can be confirmed that the blood vessels are effectively occluded by radiofrequency heat treatment.

High frequency thermal therapy using the catheter system of the above-described configuration is effective because it can prevent side effects such as occlusion of normal blood vessels, which may be caused by the use of an embolic material. However, side effects may occur in normal organs such as the heart, nervous system, and skin, in addition to the region in which the lesion is generated in the path of current transfer (path from the affected part to the ground pad). In addition, the catheter system using the above configuration is inconvenient in use, such as to attach a ground pad to the patient for the procedure.

The present invention is to solve the above problems, can locally induce coagulation necrosis only in the region where the lesion, such as vascular malformations, tumors, bleeding, etc. can be very effective high-frequency heat treatment without side effects such as damage to normal tissues Rather, the object of the present invention is to provide a bipolar electrode guide wire and a catheter system using the same, which is made of a very simple configuration and has increased the convenience and economy of the procedure.

Guide wire of the bipolar electrode method according to the present invention for achieving the above object is formed as an electrically conductive material, the first wire is inserted into the hollow catheter inserted into the tubular organ of the living body so that both ends protrude from the catheter And a second wire formed of an electrically conductive material, the main wire part being formed to be long and spaced apart from the first wire, and a coil part extending in a spiral form from the main wire part to insert the first wire inside. The first and second wires are electrically insulated from each other except only the front end portions of the first and second wires, and the front end portion of the first wire and the front end portion of the second wire are separated by a predetermined distance. It is characterized by being arranged.

According to the present invention, the spaced distance between the tip of the first wire and the tip of the second wire is preferably 1 mm to 50 mm.

In addition, according to the present invention, one end of the first wire is bent is formed in a direction crossing with respect to the longitudinal direction of the catheter, or preferably bent in a 'U' shape.

As described above, the catheter system according to the present invention is very effective because it is possible to intensively radiofrequency heat treatment only in the region where the lesion is generated, and has the advantage of not causing adverse effects on other tissues or blood vessels.

In addition, according to the present invention, there is an advantage that the workability is improved by eliminating the inconvenience of using a conventional ground pad.

In addition, in one embodiment of the present invention has the advantage that it is easy to insert the guide wire into the branching vessel by forming one end of the guide wire of the bipolar electrode method.

Hereinafter, with reference to the accompanying drawings, a bipolar electrode guide wire and a catheter system using the same according to an embodiment of the present invention will be described together.

FIG. 3 is a schematic perspective view of a bipolar electrode guide wire and a catheter system according to a preferred embodiment of the present invention, FIG. 4 is a schematic cross-sectional view taken along line IV-IV of FIG. 3, and FIG. 5 is a schematic view of line V-V of FIG. 4. It is a cross section.

3 to 5, the catheter system 100 according to the present invention includes a catheter 10, a bipolar electrode guide wire 50, and a high frequency generator 70.

The catheter 10 is formed to be inserted into a coronary organ of a living body such as a blood vessel and has a long circular cross section. The catheter 10 is generally classified by thickness and is divided into a general catheter and a microcatheter formed with a very small diameter. In the case of a microcatheter, the diameter is about 0.3 mm to 0.5 mm, and the length may vary, but for example, 80 cm to 160 cm. The catheter 10 is made of a flexible material because it is inserted into the human body through blood vessels. As the material of the catheter, fluororesins such as polytetrafluoroethylene (PTFE, PolyTetraFluoroEthylene), hexafluoropropylene copolymer (FEP), and perfluoroalkyl vinyl ether copolymer (PFA), known as Teflon resin, are used. The polytetrafluoroethylene is a crystalline polymer having a melting point of 327 ° C. and a continuous use temperature of 260 ° C., and can be stably used from low temperature (−268 ° C.) to high temperature. In addition, it has a strong chemical resistance and can be used stably without reactivity with various solvents such as acids and alkalis. In addition, materials such as polyethylene, polystyrene, and polyurethane may be used. Such a fluorine resin reduces friction when the guide wire 50 of the bipolar electrode type described later is inserted into the catheter 10 to facilitate insertion. On the other hand, the outer peripheral surface of the catheter 10 has a hydrophilic coating (hydrophilic coating) to facilitate the insertion into the blood vessels.

The catheter 10 is a hollow type with both ends open and a lumen 13 is formed therein, which is disposed coaxially along the longitudinal direction of the catheter 10. In addition, in the present embodiment, the lumen 13 is separated into the first lumen 11 and the second lumen 12 by the partition wall 14 formed along the catheter 10. The first lumen 11 includes a catheter 10 including both ends of the catheter 10, that is, a proximal end 10p inserted into the body and a distal end 10d disposed outside the body. It is formed through the whole. The first lumen 11 serves as a passage for inserting the bipolar electrode guide wire 50 to be described later. The second lumen 12 functions as a passage for injecting fluid into the inside of the balloon 60, which will be described later. The second lumen 12 proximal to the catheter 10 from a portion where the balloon 60 is disposed in the entire area of the catheter 10. Extending toward the distal end 10d opposite the end 10p. Accordingly, an inlet 17 is formed at one end of the second lumen 12 to penetrate between the inner circumferential surface and the outer circumferential surface of the catheter 10 to allow fluid to flow into the balloon 60. In addition, a fluid injection pipe 18 is disposed at the other end of the second lumen 12. The fluid injection pipe 18 is also hollow and has a third lumen (not shown) coaxially formed therein. The third lumen is for guiding the fluid injected into the balloon 60 to be described later to the second lumen 12 side, and the third lumen and the second lumen 12 communicate with each other. The fluid injection pipe 18 is fitted to the hub (h) to which the catheter 10 is fitted and fixed, and the second lumen 12 and the third lumen are connected to each other inside the hub h. have.

In this embodiment, the balloon 60 is shown in a combined form, but more generally, a catheter of a non-coupled form is employed. In the case of a non-coupled type catheter, the second lumen 12 or the fluid injection tube 18 for injecting the fluid into the balloon is not provided.

In addition, the distal end 10d of the catheter 10 is provided with an insertion hub 15 having an insertion hole formed therein for easy insertion of the guide wire 50 of the bipolar electrode type described later. The insertion port is formed to be tapered so that the diameter gradually decreases toward the proximal end 10p. Similarly, an injection hub 16 having an inclined injection hole formed therein is installed at the end of the fluid injection pipe 18 to facilitate the injection of the fluid.

Meanwhile, the bipolar electrode guide wire 50 according to the present invention includes a first wire 51 and a second wire 55.

The first wire 51 is elongated and fitted coaxially with the first lumen 11 of the catheter 10. However, both ends of the first wire 51 are disposed to protrude from the catheter 10, respectively. In the bipolar electrode guide wire 50 and the catheter system 100 according to the present invention, the first wire 51 performs a basic function of guiding a path to a region where a lesion has occurred along a blood vessel, and will be described later. It functions as an electrode for treatment. In order to function as an electrode, the first wire 51 is made of a metal material to have electrical conductivity.

A spherical first electrode 53 is attached to the front end of the first wire 51. The spherical first electrode 53 is disposed at the tip of the first wire 51 and performs an electrical action between the second electrode 58 attached to the tip of the second wire 55 to be described later. It is made of an electrically conductive material.

In addition, the outer circumferential surface of the first wire 51 is coated with a coating material 52 of an insulating polymer material, for example, Teflon resin. More specifically, the first wire 51 except for the front end of the region protruding from the first lumen 11 of the catheter 10 and the rear end connected to the high frequency generator 70 to be described later, these The central part between them is all coated by the coating agent 52. The tip portion of the first wire 51, that is, the first electrode 53, is a portion that acts as an electrode in which current is conducted between the tip portion of the second wire 55, which will be described later, as described above. Since the rear end of the wire 51 is a part electrically connected to the high frequency generator 70, the front end and the rear end of the first wire 51 are not insulated by the coating agent 52.

On the other hand, since the portion of the first wire 51 protruding from the lumen of the catheter 10 is a portion to be inserted up to the microvascular, it is formed more flexible than other portions using a material such as platinum.

Like the first wire 51, the second wire 55 is coaxially fitted to the lumen of the catheter 10, and includes the main line part 56 and the coil part 57. Since the second wire 55 acts as an electrode like the first wire 51, the second wire 55 is made of an electrically conductive metal material.

The main line portion 56 is formed long and is arranged side by side spaced apart from the first wire 51 by a predetermined distance. The coil portion 57 extends helically at the end of the main line portion 56. An annular second electrode 58 is attached to the end of the coil portion 57, that is, the tip portion of the second wire 55. The second electrode 58 is formed of an electrically conductive material. Since the annular second electrode 58 acts as an electrode corresponding to the first electrode 53 of the first wire 51, a path for propagating an alternating current between the first electrode 53 is formed. do.

In addition, the first wire 51 is inserted into the coil portion 57. However, since the first electrode 53 of the first wire 51 is disposed to protrude from the coil portion 57, the first electrode 53 and the second wire 55, which are distal ends of the first wire 51, are disposed. The second electrodes 58, which are the tips of the electrodes, are spaced apart from each other by a predetermined distance d. The distance d is preferably set to 1mm ~ 50mm. As will be described later, lesions such as blood vessels and tumors are positioned between the tip of the first wire 51 and the tip of the second wire 55, and between each tip of the first wire 51 and the second wire 55. AC propagates alternating currents, which can occlude blood vessels or cauterize tumors. Accordingly, when the distance between the tip portions of the first wire 51 and the second wire 55, that is, the distance d between the first electrode 53 and the second electrode 58 is less than 1 mm, current propagates. Not only is the area too small to be effective for large lesions, but the tip is in contact with each other, which is undesirable. In addition, if the distance (d) exceeds 50mm, there is a problem that the effective procedure is difficult because the propagation of the current is not smooth, affecting the normal tissues other than the lesion site, it is not preferable.

Since the bipolar guide wire 50 according to the present invention is inserted into the blood vessel as described above, it is not preferable that a step is formed in the guide wire 50. Accordingly, the diameter R of the first electrode 53, the outer diameter of the second electrode 58, and the width T of the coil part 57 are all the same and have the same thickness. In addition, the coating agent 52 disposed between the first electrode 53 and the second electrode 58 may be formed at a different portion so that the guide wire 50 according to the present invention can maintain the same thickness without forming a step. Compared to two thicker coatings. That is, it is formed to have the same width as the diameter R of the first electrode 53 and the outer diameter of the second electrode 58.

On the other hand, although not employed in the present embodiment, the Teflon or the like may be coated on the outer circumferential surface of the main line portion 56 of the second wire 55 like the first wire 51. However, when the coating is also applied to the coil portion 57 of the second wire 55, the bipolar electrode type guide wire 50 may be thickened, and thus the coating is not performed. In addition, the front end of the second wire 55 should not be insulated because it acts as an electrode together with the front end of the first wire 51, and the rear end should not be insulated since it should be electrically connected to the high frequency generator 70. Therefore, the front end and the rear end of the second wire 55 is not coated by the coating agent.

As described above, the first wire 51 and the second wire 55 may be electrically insulated from each other by coating the main wires of the first wire 51 and the second wire 55 using Teflon or the like. However, in the preferred embodiment of the present invention, the main wire portion 56 of the first wire 51 and the second wire 55 are electrically insulated by the polymer coating material 59. That is, in the state where the main line portion 56 of the first wire 51 and the second wire 55 are spaced apart from each other, the molten polymer coating material 59 is formed of the first wire 51 and the second wire 55. After wrapping the main wire 56 of the main wire 56 and the main wire 56 of the first wire 51 and the second wire 55 together, the coating material 59 in the molten state It solidifies.

In this state, the coating material 59 of the polymer material is interposed between the first and second wires 51 and 55 to electrically insulate them. In addition, since the first and second wires 51 and 55 are integrally formed by the coating material 59, there is an advantage in that the wires are easily separated from each other in use and operation. However, when the guide wire 50 according to the present invention is inserted into the blood vessel, it is not preferable that the first wire 51 and the second wire 55 move relative to each other, and thus, the first wire 51 and the second wire are not moved. The main part 57 of 55 is mutually coupled. Since the outer circumferential surface of the first wire 51 is surrounded by the coating agent 52, electrical insulation is maintained between the main wire part 57 of the formulation 2 wire 55 and thus, the first wire coated by the coating agent 52 ( 51 and the second wire 55, the main line portion 56 is bonded to each other by an adhesive (b) or a coupling member (not shown) to prevent relative movement.

On the other hand, since the outer diameter of the coating material 59 is the same as the width T of the coil part 57 of the second wire 55, a step is not formed between the coil part 57 and the coating material 59 and is the same. The thickness is maintained.

The bipolar electrode-type guide wire 50 having the above configuration may vary in diameter depending on the application, but in this embodiment, the outer diameter of the coil portion 57 of the second wire 55 is approximately 0.016 inches. do. For reference, in the present embodiment, the outer diameter of the catheter 10 is set to about 0.038 inches or more.

The balloon 60 is hermetically coupled to an outer circumferential surface of the catheter 10, and more specifically, surrounds an area in which the inlet 17 of the second lumen 12 is disposed and is coupled to the outer circumferential surface of the catheter 10. Balloon 60 is to expand in the blood vessel to block the blood flow is made of a flexible material. That is, when the fluid (generally used for angiography) flows between the inner circumferential surface of the balloon 60 and the outer circumferential surface of the catheter 10 via the inlet 17 via the second lumen 12, the balloon 60 is Will expand. Accordingly, the proximal end 10p of the catheter 10 remains in a contracted state before reaching the lesion area, and expands when fluid is injected in the lesion area. Since the outer circumferential surface of the balloon 60 is in contact with blood, it is preferable that the outer circumferential surface is formed of a material having antithrombogenic properties, and that a considerable amount of heat is generated during high frequency heat treatment, which will be described later. .

The radiofrequency generator 70 generates high frequency alternating current and is used for electrosurgery, and is used to locally cut or coagulate living tissue. In the present embodiment, the first wire 51 of the bipolar electrode guide wire 50 is electrically connected to the anode end (+) of the high frequency generator 70, and the second wire 55 is the high frequency generator 70. Is electrically connected to the negative terminal (-). Accordingly, in the present embodiment, as described in the related art, the first wire 51 and the second wire 55 act as positive and negative electrodes, respectively, instead of a monopolar electrode using a ground pad. Form a bipolar electrode. When about 20 watts of power is applied to the high frequency generator 70, a high frequency region (200 to 1200 kHz) is formed between the first electrode 53 of the first wire 51 and the second electrode 58 of the second wire 55. AC current propagates. As the alternating current propagates, frictional energy caused by the vibration of ions raises the temperature of biological tissues such as blood vessels and tumors to induce coagulation necrosis, thereby occluding bleeding blood vessels or cauterizing tumors.

When performing high frequency thermal therapy using unipolar electrode, there is inconvenience in using the ground pad attached to the patient as described above, and above all, it is necessary to close the block by forming a long transmission path of current from the electrode to the ground pad. There was a problem that affects other major vessels or tissues that accompany the blood vessels. However, when the bipolar electrode is used as in the present invention, since the delivery path is locally formed only in the bipolar electrode type guide wire 50, there is an advantage that no side effects occur in other tissues or blood vessels.

On the other hand, the balloon 60 is necessary for the effective high-frequency heat treatment when the blood flow in the bleeding area is fast. In other words, heat treatment through the high-frequency generator 70 is to induce coagulation by increasing the temperature of the tissue, when the blood flow is fast heat is transferred to the lesion rather than concentrated in the so-called heat sedimentation effect (heat sink effect) occurs, so it is difficult to induce coagulation necrosis. In this case, the balloon 60 is inflated in the blood vessel to temporarily block blood flow and perform high frequency heat treatment, thereby enabling an effective procedure.

Until now, one end (proximal end 10p side of the catheter) of the first wire 51 of the bipolar electrode guide wire 50 has been described and illustrated as being straight, but one end of the first wire has various shapes. Can have 6 and 7 show an embodiment in which one end of the first wire 51 is curved.

6 is a schematic perspective view of a bipolar electrode guide wire according to another embodiment of the present invention. Figure 7 is a schematic perspective view of the main portion of the bipolar electrode guide wire according to another embodiment of the present invention.

Referring to FIG. 6, one end of the first wire 51 is bent and disposed in a direction crossing the length direction of the catheter. In addition, referring to Figure 7, one end of the first wire 51 is formed to be completely curved in the letter 'U' shape. The blood vessels form branches from the coarse blood vessels and branch into narrow blood vessels, which are arranged in a direction intersecting with the coarse blood vessels. In order to insert the bipolar electrode guide wire 50 into the branched blood vessel along the thick blood vessel, one end of the first wire 51 may be bent as shown in FIG. 6. That is, when the guide wire 50 of the bipolar electrode type is rotated at the part where the blood vessel branches, the curved one end of the first wire 51 can be oriented toward the branched blood vessel.

In addition, when the blood vessel is formed to be completely reversed and branched, and it is necessary to insert the bipolar electrode guide wire 50 into the blood vessel completely branched, one end of the first wire 51 as shown in FIG. Being formed in the letter 'U' allows easy insertion.

So far, the guide wire according to the present invention has been described as being used in connection with a high frequency generator, but is not necessarily limited thereto and may be used in connection with a microwave generator according to a lesion.

Although the present invention has been described with reference to the embodiments shown in the accompanying drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. There will be. Accordingly, the true scope of protection of the invention should be defined only by the appended claims.

1 is a schematic diagram for explaining a radiofrequency thermal therapy using a catheter.

FIG. 2 is a photograph illustrating a radiofrequency thermal therapy performed using a catheter and an electrode for a patient in which a bleeding disease due to trauma is caused by trauma. FIG. 2A is a state before treatment, and FIG. The wire is inserted and FIG. 2C is after the treatment.

3 is a schematic perspective view of a bipolar electrode guide wire and catheter system according to a preferred embodiment of the present invention.

4 is a schematic cross-sectional view taken along the line IV-IV of FIG. 3.

FIG. 5 is a schematic cross-sectional view taken along the line VV of FIG. 4.

6 is a schematic perspective view of a bipolar electrode-type guide wire according to another embodiment of the present invention.

7 is a schematic perspective view of a bipolar electrode guide wire according to another embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

100 ... Catheter System 10 ... Catheter

50 ... bipolar electrode guide wire 51 ... first wire

52 ... Coatings 55 ... Second Wire

56 ... Main Line 57 ... Coil Section

59 ... cloth 60 ... balloons

Claims (14)

A first wire formed as an electrically conductive material, the first wire being inserted into a hollow catheter inserted into a tubular organ of a living body and having both ends protruding from the catheter; And A second wire made of an electrically conductive material, the main wire part being elongated and spaced apart from the first wire, and a coil part extending in a spiral form from the main wire part to insert the first wire inwardly; Including;  Electrically insulated between the first wire and the second wire, each end portion of the first wire and the second wire is insulated, the front end portion of the first wire and the second wire is insulated constant Guide wire of the bipolar electrode type, characterized in that spaced apart. The method of claim 1, Bipolar electrode-type guide wire further comprises a spherical first electrode made of an electrically conductive material and coupled to the tip of the first wire. The method of claim 2, The diameter of the spherical first electrode is a bipolar electrode-type guide wire, characterized in that the same as the width of the second wire coil portion. The method of claim 1, Bipolar electrode guide wire made of an electrically conductive material, characterized in that it further comprises a ring-shaped second electrode coupled to the front end of the second wire. The method of claim 1, A bipolar electrode guide wire, wherein the distance between the distal end of the first wire and the distal end of the second wire is 1 mm to 50 mm. The method of claim 1, One end of the first wire is bent bipolar electrode type guide wire, characterized in that formed in the direction crossing with respect to the longitudinal direction of the catheter. The method of claim 1, One end of the first wire is a bipolar electrode-type guide wire, characterized in that formed in a curved "U" shape. The method of claim 1, The first wire and the second wire are electrically insulated from each other by coating the outer circumferential surface of the first wire with a Teflon-based coating agent to electrically insulate each other. The method of claim 8, A bipolar electrode guide wire, characterized in that the outer peripheral surface of the second wire main line part is coated by a coating agent made of Teflon material. The method of claim 8 Further comprising a spherical first electrode made of an electrically conductive material and coupled to the front end of the first wire, and a second ring-shaped electrode made of an electrically conductive material and coupled to the front end of the second wire, The thickness of the portion disposed between the first electrode and the second electrode of the coating agent coated on the first wire is a bipolar electrode type guide wire, characterized in that the same as the width of the second wire coil portion. The method of claim 1, The main wire part of the first wire and the second wire is a bipolar electrode type guide, which is coupled to each other while being electrically coupled while maintaining an electrically insulated state by an insulating material interposed between the first wire and the second wire. wire. The method of claim 1, The main wire portions of the first wire and the second wire are integrally formed by being enclosed together by a coating material of an insulating material while being spaced apart from each other. The coating agent is interposed between the main wire portions of the first wire and the second wire to electrically insulate the main wire portions of the first wire and the second wire from each other. A hollow catheter inserted into a coronal organ of a living body, the both ends of which are open and in which lumens are coaxially formed; And The main wire portion is formed as an electrically conductive material, and is inserted into the lumen of the catheter and is disposed at both ends to protrude from the lumen, and the main wire portion is formed of an electrically conductive material and is formed to be long and spaced apart from the first wire. And a second wire helically extending from the main line portion, the second wire having a coil portion into which the first wire is inserted, and wherein the first wire and the second wire are electrically insulated from each other. And a tip wire of each of the second wires is insulated from each other, and a tip wire of the first wire and the tip of the second wire are insulated from each other. Catheter system. The method of claim 13, Further comprising a high frequency generator for generating a high frequency current, And a first wire and a second wire of the bipolar electrode type guide wire are electrically connected to the high frequency generator with different polarities.

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