JPH10243947A - High-frequency device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily pierce an electrode to a desired part in an organization so as to execute positioning by forming at least one of plural electrodes to be a shape which can be pierced into a living body and coating the electrode so as to reduce electric insulating property at least in its tip part. SOLUTION: A high-frequency power source 1 in a high-frequency device is connected to a piercing electrode 3 to be pierced into the living body in one side and to an out-of-body electrode 4 which is arranged in a prescribed position in the outside of the living body 6 in the other side with a matching circuit 2 for attaining matching of the impedance of the living body 6. Then, high-frequency current with the matching circuit 2 is permitted to flow in the both electrodes 3 and 4 so that high-frequency current is given only to a medical treatment part 5 to execute a prescribed treatment in the living body 6 by heating, solidification and burning, etc., against the part 5. In this case, the piercing electrode 3 is constituted by coating the periphery of an electrode needle 8 consisting of stainless steel being a conductive body in a center part by a coating part 7 provided with a lubricity by non-uniform thickness so that piercing is facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, a method in which a high-frequency current is applied between a pair of electrodes inserted or brought into contact with a living body,
The present invention relates to a high-frequency device for treating an affected tissue of a living body.

[0002]

2. Description of the Related Art Conventionally, in the field of medical equipment, various types of therapeutic devices for necrosis by heating or cauterizing a malignant tumor or the like generated in a living body using, for example, a DC wave or a microwave. Is disclosed.

For example, Japanese Utility Model Application Laid-Open No. 2-51564 discloses a technique related to a direct current treatment apparatus for quantitatively confirming tissue necrosis during direct current treatment and judging the treatment effect accurately. That is, in the same technology, a pH sensor is provided on a pair of needle-shaped bipolar electrodes, and based on the pH measured by the pH sensor, the power supply to the electrodes is controlled, whereby the necrosis of the tissue is quantitatively confirmed, Judge the therapeutic effect.

Further, for example, Japanese Patent Application Laid-Open No. 3-92182 discloses a technique relating to a microwave therapy apparatus which is easy to operate, does not flow a direct current through a living body, and has no adhesion to the living body. In other words, in this technique, a non-adhesive coating is applied to the probe tip electrode, a DC current is applied between the electrodes during non-microwave irradiation, the impedance between the electrodes is measured, and the non-adhesive coating is peeled off based on the measurement result. Is detected.

On the other hand, in the technique using a power supply unit of a high frequency unit, in order to treat, for example, a breast cancer or a prostate cancer, a high-frequency current is concentrated on the site in the body, and the site is necrotized by the high-frequency current concentration. ing. In addition, for example, in the treatment of esophageal cancer and the like, by inserting an intraluminal electrode, the high-frequency current is concentrated on the site, heating, coagulation,
He is taking measures such as cauterization. In what is generally called "hyperthermia", the cancer cells are moved from 42 degrees to 4 degrees.
Cauterize 4 times, without affecting normal cells,
Necrosis only cancer cells with less blood flow. In addition,
In a high temperature range, that is, for example, proteins are decomposed 6
Various techniques for cauterizing completely localized cancer cells at 0 degrees or more have been proposed.

[0006]

However, in the technique disclosed in Japanese Utility Model Laid-Open No. 2-51564,
Since a direct current is used, the degree of energy penetration into the living body is low, and it is difficult to reliably coagulate, cauterize, etc. in the tissue within a specified range. Further, when the output is high, there is a problem that the nervous system is stimulated. In addition, since it is difficult to coat the electrode itself due to the characteristic of using a direct current, there is also a problem that the electrode is cauterized to a peripheral portion and the electrode adheres.

Further, in the technique disclosed in Japanese Patent Application Laid-Open No. 3-92182, it is necessary to transmit energy by microwaves to the electrodes using a coaxial cable, so that the structure as an applicator is very complicated. Had become. Furthermore, it is difficult and expensive to produce a material having a hardness and diameter suitable for being inserted into the body. Further, since all of the electrodes are not covered, there has been a problem that the electrodes adhere to the skin and cannot be easily removed as described above.

In general, when an electrode for an electric scalpel is provided with a covering material on the electrode, desired incision and coagulation cannot be performed. Further, if the electrode member such as stainless steel is bare, there is a possibility that the electrode will adhere to the tissue at the time of tissue coagulation.

In a treatment apparatus using an insertion electrode for radio frequency (RF) energy treatment, for example, on the order of 8 MHz, there is an example in which the insertion electrode is uniformly coated with one member, but the treatment range is locally limited. It is difficult to limit the procedure, the treatment range in the living body is the entire length of the puncture length of the electrode,
There is a disadvantage that energy is supplied to all the punctured portions, and all of the punctured portions are heated and solidified. Furthermore, when the RF electrode inserted into the living body has an abnormally high temperature,
The coating member for controlling the treatment area was destroyed, so that the treatment area could not be controlled. In addition, there was a possibility that the metal as the internal conductive member adhered to the living tissue, causing bleeding when removing the electrode. In addition, it is desirable that the needle-shaped electrode be strong as much as possible and be as thin as possible.
In the electrode using the electrode, when the diameter of the electrode becomes small, the loss increases, and further, there is a possibility that the heat generated by the electrode itself may reach the tissue around a desired portion.

Further, among treatment apparatuses using microwaves (MW; Micro Wave) on the order of, for example, 2450 MHz, there is a treatment apparatus in which the periphery of the insertion portion of the electrode is insulated, but the thickness of the coating film is limited. Since the tip portion is constant and has a bare structure without covering, the tip portion of the electrode may adhere to the tissue during the treatment.

[0011] In addition, although there is an insertion type electrode formed in a needle shape to facilitate insertion of the electrode, it is extremely difficult to accurately insert the electrode into a desired deep part of a patient. Even if it could, the position could not be fixed exactly. Since it is not possible to visually observe the state of the treatment site, it has been difficult to determine the degree of coagulation or the like.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has as its object to easily insert, position, detain, and withdraw a desired site in a tissue, To provide a high-frequency device that allows only heating, coagulation, or cauterization of a part to be performed, enables easy determination of the state of the heating, coagulation, or the like, and improves clinical safety. is there.

[0013]

In order to achieve the above object, a high-frequency device according to the present invention comprises a high-frequency power supply and a plurality of electrodes for supplying a high-frequency current from the high-frequency power supply to a desired portion of a living body. In the high-frequency device, at least one of the plurality of electrodes has a shape capable of penetrating the living body, and the electrode is covered with a covering material so that at least the distal end has low electrical insulation. It is characterized by doing.

That is, in the high-frequency device according to the present invention, the covering member for covering the electrode is formed to be thin only in a portion corresponding to the region of the living body to which the high-frequency current is to be applied, and is sharp so as to easily penetrate the living body. It is configured to have a sharp tip.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing the configuration of a high-frequency device according to the first embodiment. FIG. 1A shows the overall configuration of the high-frequency device according to the first embodiment. FIG.
(B) has shown the detailed structure of the insertion electrode of the said high frequency device.

As shown in FIG. 1A, this high-frequency device comprises a high-frequency power supply 1, a matching circuit 2, a piercing electrode 3, and an extracorporeal electrode 4. The high-frequency power supply 1 includes a matching circuit 2 for matching with the impedance of the living body 6.
Are connected to the insertion electrode 3 and the other is connected to the extracorporeal electrode 4. The extracorporeal electrode 4 is arranged at a predetermined position outside the living body 6, and the insertion electrode 3 is inserted into the living body 6. Then, a high-frequency current flowing through the matching circuit 2 of the high-frequency power supply 1 flows between the insertion electrode 3 and the extracorporeal electrode 4, and thereby a treatment site 5 where a predetermined treatment of the living body is to be performed.
Only the high-frequency current is applied to the portion 5, and the portion 5 is heated, coagulated, cauterized, and the like.

The frequency of the high-frequency power supply 1 is not particularly limited. However, unless a certain high frequency is used, it is not possible to specify a treatment site due to uneven coating thickness described later. It is preferred to use. Further, when the ISM frequency is considered, for example, about 13.56 MHz or about 27.12 MHz is preferable.

As shown in FIG.
In the center of the electrode, for example, a stainless steel electrode needle 8
Are arranged. The periphery of the stainless steel electrode needle 8 is covered with a coating portion 7 having an uneven thickness and having lubricity. Generally, for example, FEP, PTFE
It is conceivable to cover with a lubricating resin material such as. Since the penetration electrode 3 has a non-uniform coating thickness according to the length of the treatment site, a high-frequency current is intensively applied to a thin portion of the coating to cauterize only a desired treatment site. To make things possible.

When a coating is formed by a heat-shrinkable tube or the like as a simple manufacturing method, an appropriate insulating filler is filled because the tip of the insertion electrode 3 is hollow. For example, it is sufficient to bond the silicon adhesive to the adhesive. Also, the tip is FEP, PTFE
The tip of the insertion electrode may be made sharper by solid molding integrally with a resin such as the above, so that the insertion can be performed more easily. When using the heat-shrinkable tube for the coating portion 7, first, after a single coating,
By performing the second coating while leaving the target treatment length, it can be easily created.

According to the first embodiment, since the covering portion 7 made of resin covers the entire stainless steel electrode needle 8, adhesion between the piercing electrode 3 and the tissue of the living body 6 does not occur.
Furthermore, since the thickness of the coating 7 is not uniform,
Only a desired range inside the living body 6 can be treated.

FIG. 2 is a diagram showing a configuration of a piercing electrode used in the high-frequency device according to the second embodiment. In the above-described first embodiment, the thickness of the covering portion 8 is reduced only at the distal end portion of the insertion electrode 3 to enable coagulation or the like only at the treatment site corresponding to the length. The insertion electrode 9 according to the second embodiment enables heating, cauterization, coagulation, and the like of a plurality of treatment sites existing in the axial direction at a time.

That is, as shown in FIG.
A plurality of portions 5a, 5b, and 5c having a small coating thickness are provided in the axial direction (each length is a, b, and c in the figure), and a plurality of treatments are performed by flowing a high-frequency current in this range. It is possible to treat the site at once. In addition, each length of the thin portion of the coating portion may not be the same length, and it is a matter of course that the length can be set according to the size of a desired treatment site. . This second
According to the embodiment, multi-point treatment can be performed by one puncture, and low invasiveness is achieved.

FIG. 3 is a diagram showing a configuration of a piercing electrode used in the high-frequency device according to the third embodiment. In the first embodiment described above, for example, when coating is performed using a Teflon heat-shrinkable tube, a step occurs at the boundary between the thin and thick portions. On the contrary,
The piercing electrode 10 used in the high-frequency device according to the third embodiment has a configuration in which the boundary is continuously changed, that is, a step is not generated. Thereby, for example, even when a treatment is performed on a treatment site in a liver or the like, it is possible to smoothly insert the insertion electrode without moving the liver or the like, thereby further improving operability. it can.

FIG. 4 is a diagram showing a configuration of a piercing electrode used in the high-frequency device according to the fourth embodiment. As shown in the figure, in the present embodiment, a sharp X-ray opaque member 12 is provided at a predetermined position at the tip of the insertion electrode 11. According to this, when performing a treatment under X-ray fluoroscopy, the position of the insertion electrode 11 in the living body can be easily grasped, and accurate treatment can be performed even when treating a desired treatment site. Close. In addition, since only the distal end portion needs to be connected separately, there is an advantage that the structure is easy to manufacture.

FIG. 5 is a diagram showing the configuration of a piercing electrode used in the high-frequency device according to the fifth embodiment. As shown in the figure, the puncture electrode 13 is provided with a “scale” on the surface of the covering portion. Therefore, the inserted length can be grasped visually at any time, and the position of the tip of the inserted electrode 13 can be determined appropriately. This is also effective in determining whether or not the insertion electrode has moved from the initial position of the living body after insertion, and can enhance clinical safety.

FIG. 6 is a diagram showing the configuration of a piercing electrode used in the high-frequency device according to the sixth embodiment. As shown in the figure, in the insertion electrode 14 of this embodiment,
Second covering portion 7b covered on first covering portion 7a
However, it is configured so that it can be quickly peeled off at the clinical stage within a desired range. For example, according to the treatment site, A,
By peeling the covering material in each of the ranges B and C, it is possible to obtain an electrode corresponding to a desired range of the treatment site. In addition, according to the sixth embodiment, it is needless to say that the piercing electrode 9 as shown in FIG. As described above, according to the sixth embodiment, it is possible to quickly create an insertion electrode corresponding to various treatment ranges, for example, at the time of clinical practice.

FIG. 7 is a diagram showing the configuration of a piercing electrode used in the high-frequency device according to the seventh embodiment. As shown in the drawing, in the insertion electrode 15, a second coating portion 12a coated on the first coating is movable with respect to the first coating portion. Therefore, by moving the second covering portion 12a according to the range of the treatment site, the effective length at which the high-frequency current should be concentrated can be changed to a desired length. Further, if the second covering portion 12a and the tip portion are made of an X-ray opaque member, the position can be easily specified under X-ray fluoroscopy. After the second coating is set at a desired position, the second coating is fixed to the first coating material by, for example, screwing, so that the second coating moves from the set position when piercing a living body at the time of clinical practice. Needless to say, there is no possibility that such a problem will occur.

FIG. 8 is a diagram showing the configuration of a piercing electrode used in the high-frequency device according to the eighth embodiment. As shown in the figure, in the piercing electrode 16, a linear projection 17 is further provided on the second covering portion 7b covered on the first covering portion 7a. As described above, since the linear projections 17 are provided on the covering portion 7b, warpage of the punctured portion due to resistance at the time of piercing into the living tissue 6 does not easily occur, and therefore, it is possible to easily and linearly pierce a desired portion. . In general, the internal organs such as the liver move by respiration, etc., but according to the insertion electrode according to the present embodiment, the insertion electrode can be prevented from relatively moving, thereby improving clinical safety. be able to.

FIG. 9 is a diagram showing a configuration of a piercing electrode used in the high-frequency device according to the ninth embodiment. As shown in the figure, in the piercing electrode 18, a spiral projection 19 is provided on the second covering portion. As described above, since the coating has the spiral projections 19, it is difficult for the insertion portion to be warped due to resistance at the time of insertion into the living tissue, so that it is possible to easily and linearly insert a desired portion. Further, the spiral projection 1
Having 9 makes it easier to pierce relatively hard tissue. In addition, after positioning, the axial movement of the piercing electrode 18 is regulated by the helical projection 19, so that the indwellability during treatment is improved, and the safety in clinical practice can be improved.

FIG. 10 is a diagram showing the configuration of a piercing electrode used in the high-frequency device according to the tenth embodiment. As shown in the figure, a part of the surface of the coating of the insertion electrode 20 is formed in a flange shape 22, and in relation to a brim-shaped fixing member 21 fixed to the body surface, the insertion electrode 20 The position is fixed. When the treatment is performed at a position relatively close to the body surface, the present embodiment can also prevent the insertion electrode from relatively moving in relation to the body surface, thereby improving clinical safety. Is valid. The collar-shaped fixing member 21 is fixed to the body surface by inserting a screw through a hole provided at a predetermined position or by sewing.

FIG. 11 is a diagram showing an example of use of the high-frequency device according to the eleventh embodiment.

FIG. 2A shows an example of use in which a rigid needle 23 such as a stainless needle is percutaneously inserted to accurately approach a target treatment site. FIG. 1B shows an example of use of a 24-wire elastic needle such as a stranded wire, a titanium needle, or the like, for transendoscopic approach. According to this embodiment, an accurate puncture ability according to the treatment method can be obtained.

FIG. 12 is a diagram showing the configuration of the insertion electrode used in the high-frequency device according to the twelfth embodiment.
(A) is a side sectional view, and (b) is a front sectional view.

As shown in FIG.
Has a channel 26 in its coating. At the time of actual insertion, first insert a general guide needle to the affected area,
While passing the guide needle through the channel 26, the insertion electrode 2
5 is inserted into the affected area according to the guide needle. Alternatively, with the guide needle inserted into the channel 26, the guide needle and the insertion electrode 26 are inserted together to the affected part, and after this insertion, the guide needle is pulled out. According to the twelfth embodiment, even if the strength of the insertion electrode is insufficient, the insertion can be performed by using the guide needle, so that the diameter of the insertion electrode can be reduced. Further, it is easy to reliably insert the diseased part into the affected part. Further, if alcohol is injected from the above channel, simultaneous use with so-called “alcohol injection coagulation method” or the like is also possible.

FIG. 13 is a diagram showing the configuration of the insertion electrode used in the high-frequency device according to the thirteenth embodiment.
(A) is a side sectional view, and (b) is a front sectional view.

As shown in FIG.
Is an internal electrode 2 serving as a conductor made of, for example, stainless steel.
8 is cylindrical and has a channel 29 inside the electrode 28. At the time of actual insertion, first, a general guide needle is inserted into the affected part, and the insertion electrode is inserted into the affected part according to the guide needle while passing the guide needle through the channel 29. Alternatively, with the guide needle inserted into the channel 29, the guide needle and the insertion electrode 27 are inserted together to the affected area, and after this insertion, the guide needle is pulled out. The position of the channel 29 may be provided on the side of the electrode. However, from the viewpoint of characteristics, it is desirable that the electrode is cylindrical and the channel is provided at the center. According to the thirteenth embodiment, even if the strength of the insertion electrode is insufficient, the insertion can be performed by using the guide needle, so that the diameter of the insertion electrode 27 can be reduced. Further, it is easy to reliably insert the diseased part into the affected part. Further, if alcohol is injected from the above channel, simultaneous use with so-called “alcohol injection coagulation method” or the like is also possible.

FIG. 14 is a diagram showing the configuration of the insertion electrode used in the high-frequency device according to the fourteenth embodiment. As shown in FIG.
Only three are removable. Further, the stainless steel needle 31 and the covering portion 33 are configured to be connected by fitting members 30 and 32. According to the fourteenth embodiment, it is possible to remove and replace the covering material for each treatment, so that clinical safety and economy can be improved. Furthermore, the use can be expanded.

FIG. 15 is a view showing the configuration of the insertion electrode used in the high-frequency device according to the fifteenth embodiment. As shown in the figure, in this insertion electrode, the open end of the channel 35 is separated into two sides by a catheter, one is a high-frequency insertion electrode for inserting the insertion electrode, and the other is a syringe. Syringe taper 34 for injecting liquid using
And According to the fifteenth embodiment, more stable treatment and observation can be performed by injecting the electrolytic solution at the time of inserting the insertion electrode and the degassed water at the time of inserting the ultrasonic probe with the syringe. In addition, if the degassed electrolytic solution is used, it can be shared.
Further, in this example, it is a matter of course that the tip portion is not a through hole.

FIG. 16 is a diagram showing the configuration of the insertion electrode used in the high-frequency device according to the sixteenth embodiment. As shown in the figure, in this insertion electrode, after the stainless steel needle 36 is subjected to copper plating 37 as a highly conductive material,
It is configured to be covered by the covering portion 38. That is, copper plating is performed to increase the conductivity while maintaining the strength of the needle with stainless steel. According to the sixteenth embodiment, the conductivity of the high-frequency current can be further improved. It is needless to say that the conductivity can be further increased by plating with a material having higher conductivity such as gold.

FIG. 17 is a diagram showing the configuration of the insertion electrode used in the high-frequency device according to the seventeenth embodiment. As shown in the figure, the predetermined portion of the insertion electrode is thin, and when the RF relay cable 39 is pulled out, the electrode 4
The portion corresponding to 0 is broken and cannot be reused by the same electrode. Then, when another electrode is fitted to the RF relay cable 39 again, it can be newly used. According to the seventeenth embodiment, the use is performed only once, and the electrode is not used while being bent, so that the treatment safety is improved.

FIG. 18 is a diagram showing the configuration of the high-frequency device according to the eighteenth embodiment.

As shown in the figure, a matching circuit 2 for efficiently supplying power and a traveling wave / reflected wave power measuring circuit 41 are arranged in parallel between the high frequency power supply 1 and the electrodes 3 and 4. Has been established. Since the impedance changes depending on the length of the treatment site of the insertion electrode 3, the load is variable, and the electric power reflectance is adjusted to be approximately 0% at the start of the treatment. This adjustment may be manual or automatic.

After the start of the treatment, the matching circuit 2 is not adjusted. As the properties (moisture content, coagulation degree, temperature, etc.) of the tissue at the treatment site change as the treatment progresses, the load impedance viewed from the power source changes, and the power reflectance changes. This change is measured by the traveling wave / reflected wave power measurement circuit 41, and the result is compared with the threshold value by the control circuit 42, and the display circuit 43 or the buzzer 44 displays the power reflectance, or the reflectance is displayed. When a certain threshold value is exceeded, the user is notified or instructed by a warning sound or a warning light to that effect.

Alternatively, the control circuit 42 controls so as to cut off or reduce the high-frequency output when the power reflectance exceeds the threshold value. The threshold value may be set to a fixed value to simplify the operation, and may be adjusted according to an arbitrary treatment. Furthermore, it has an electrode recognition function,
A threshold value corresponding to each insertion electrode can be automatically set.

FIG. 19 is a diagram showing the configuration of the high-frequency device according to the nineteenth embodiment.

As shown in FIG. 19A, a temperature sensor 45 is built in the piercing electrode 3, and its output is connected to the control circuit 42 via the temperature sensor circuit 46. The temperature detected by the temperature sensor 45 is displayed by the display circuit 43 as needed. When the temperature detected by the temperature sensor 45 exceeds a certain temperature, the control circuit 42 cuts off or reduces the high-frequency power, and controls so as to maintain a desired temperature range.

When the temperature exceeds a certain temperature, the display circuit 43 or the buzzer 44 can notify the user with a warning sound or a warning lamp. According to the nineteenth embodiment, it is possible to control the high-frequency output or to notify the user of the tissue properties of the treatment site based on the more direct information of the temperature, and to cauterize the treatment site. It is possible to prevent overkill.

Here, the detailed configuration of the piercing electrode incorporating the above-mentioned temperature sensor is shown in FIG. 19 (b), and the first covering portion 47 covering the periphery of the electrode wire 50 and the outside thereof are shown. A temperature sensor 45 is arranged between the covered second covering portions 48.

FIG. 20 is a diagram showing the configuration of the high-frequency device according to the twentieth embodiment.

As shown in the figure, in this insertion electrode, a plurality of temperature sensors 45a, 45b, 4
5c is provided, and when the temperature detected by these temperature sensors exceeds a preset temperature, the temperature controller 51 forcibly cuts off the high-frequency output. Therefore, according to the twentieth embodiment, it is possible to prevent thermal damage to a non-treatment site.

FIG. 21 is a diagram showing the configuration of the high-frequency device according to the twenty-first embodiment.

As shown in the figure, in this example, the treatment range is expanded by using a plurality of insertion electrodes 52a, 52b and 52c. In this example, since the puncture electrode is pierced from multiple points of the living body at the same time, it is effective when a wide range of treatment is required, for example, when the patient is not a minute cancer. In this example, each electrode has an elliptical cautery range.

FIG. 22 is a diagram showing the configuration of the high-frequency device according to the twenty-second embodiment.

As shown in the figure, in this example, no extracorporeal electrode is required, and a plurality of piercing electrodes 53 and 54 are used in a bipolar type. That is, in this example, the puncture electrodes 53 and 54 are pierced into the living body together, and a high-frequency current is applied between the puncture electrodes 53 and 54 to perform treatments such as coagulation, heating, and cauterization of a desired portion. In this example, a predetermined range between the electrodes 53 and 54 is an ablation range.

FIG. 23 is a diagram showing the configuration of the high-frequency device according to the twenty-third embodiment.

As shown in the figure, in this example, the tip of the insertion electrode is coated with a low-impedance coating material 58, and the other portions are coated with a high-impedance coating material 57. According to the twenty-third embodiment, even when the entire insertion portion is inserted into the tissue, the high-frequency current concentrates on the portion covered with the low impedance material 58 at the tip of the insertion portion, so that only this portion is treated. can do.

FIG. 24 is a diagram showing the configuration of the high-frequency device according to the twenty-fourth embodiment.

As shown in FIG.
The tip is formed by a spiral part 59 having a spiral shape. Therefore, according to the twenty-fourth embodiment, in addition to the above-described effects, by making the shape spiral, the coating is substantially thinned, and the high-frequency current is reduced. The concentration is increased, and local treatment can be performed more efficiently.

FIG. 25 is a diagram showing the configuration of the insertion electrode of the high-frequency device according to the twenty-fifth embodiment. As shown in the figure, the insertion electrode includes a non-conductive insertion catheter and electrodes along the inner surface thereof, and a rigid wire 61 is connected to the electrode 62. Move the rigid wire 61,
A multipoint trimmer 60 for fixing is attached to the catheter. Therefore, the electrode 62 can be freely moved by the trimmer 60, and the position can be finely adjusted after the electrode is inserted.

According to the twenty-fifth embodiment, the treatment range in the tissue can be selectively widened by accurately moving and fixing the electrode 62 in the catheter. Therefore,
Even when it is difficult to specify the position while clinically inserting, the treatment range can be specified after insertion.

FIG. 26 is a diagram showing the configuration of the insertion electrode of the high-frequency device according to the twenty-sixth embodiment. (A) shows a state before insertion, and (b) shows a state after insertion.

As shown in the figure, in this example, a multi-needle electrode 6 spreading in a fan shape is provided inside a non-conductive insertion catheter.
6 is stored. Then, after the catheter is inserted, the multi-needle electrode 66 is taken out from the distal end to form an electrode having a wide heating range. According to the twenty-sixth embodiment, the same treatment range as in the case where a plurality of needle-shaped electrodes are inserted can be obtained with a low invasiveness in which only one catheter is inserted.

FIG. 27 is a diagram showing the configuration of the insertion electrode of the high-frequency device according to the twenty-seventh embodiment. As shown in the figure, in this example, the covering portion 68 of the non-conductive member is non-uniform in the radial direction, and the directivity is provided in the radial treatment range. According to the twenty-seventh embodiment, the treatment range in the radial direction of the needle-shaped electrode can be made directional, and the present invention can be applied to an affected part that cannot be directly inserted into the central part.

FIG. 28 is a view showing a state of a connector for connecting the insertion electrode and the high-frequency cable. As shown in the figure, the insertion electrode is composed of an insertion section 71 having a treatment section 70 at its tip, a grip section 72 and a connector 73, and a connector 74 is provided on the high-frequency cable. . The connector 73 on the insertion electrode 69 and the connector 74 on the high-frequency cable are fitted.

FIG. 29 is a sectional view showing FIG. 28 in more detail. As shown in the figure, on the insertion electrode side, the thin stainless steel rod 77 is covered by a first covering portion 76, and the second covering portion 78 is left except for the length of the treatment portion 70.
In the region to be further gripped by the gripping portion covering portion 7
9 is covered, and a buckle 80 is provided only at a predetermined position thereon. At the rear end of the stainless steel rod 77,
A crimp terminal 81 is provided, and its outer periphery is covered by a housing 82.

On the other hand, on the high-frequency cable side, a high-frequency lead wire 87 is covered with a coating tube 86, and a break stopper 85 is provided at a predetermined position on the outer periphery thereof. A crimp terminal 84 is provided at the end of the high-frequency lead wire 87, and the outer periphery of the crimp terminal 84 is covered by a housing 83.

Although the embodiment of the present invention has been described above, the present invention is not limited to this, and it is a matter of course that various improvements and modifications can be made without departing from the gist of the present invention. For example, in most of the above embodiments, the description has been given on the assumption that the insertion electrode is directly inserted only by the rigidity of the electrode, but the present invention is not limited to this, and it is possible to use the guide member. It is also possible to adopt a configuration that allows insertion. Furthermore, in the above embodiment, the range in which the high-frequency current is concentrated is adjusted by changing the thickness of the coating material. However, the thickness is made uniform, and the content of the insulating material in the insulating member is changed. so,
The range in which the high-frequency current is concentrated can be adjusted. Further, in the above-described embodiment, the case where treatment is mainly performed on the liver and the like has been described as an example. Of course.

The above-described embodiment of the present invention includes the following inventions.

(1) In a high-frequency device having a high-frequency power supply and a plurality of electrodes for applying a high-frequency current from the high-frequency power supply to a desired part of a living body, at least one of the plurality of electrodes is connected to the living body. A high-frequency device having a shape capable of being pierced and covering the electrode with a coating material so that at least the tip of the electrode has low electrical insulation.

(2) At least one of the plurality of electrodes is configured such that the coating is thinned only in a region corresponding to a desired portion to which a high-frequency current of a living body is to be applied in a concentrated manner. The high-frequency device according to the above (1).

(3) The high-frequency device according to (1), further comprising a matching circuit for matching with the impedance of the living body.

(4) The high-frequency device according to (1), wherein at least one of the plurality of electrodes is constituted by a stainless steel electrode needle.

The inventions of (1) to (4) are based on the first aspect.
(FIG. 1). According to this, by making the thickness of the covering portion non-uniform, the high-frequency current can be concentrated on a desired region. The second
First, the concept of the twenty-second embodiment (FIGS. 21 and 22) is also included in the present invention.

(5) At least one of the plurality of electrodes can be appropriately configured so that the coating is thinned only in regions corresponding to a plurality of desired parts to which a high-frequency current of a living body is to be applied in a concentrated manner. The high-frequency device according to the above (1), wherein:

The present invention corresponds to the second embodiment (FIG. 2). According to this, a multipoint treatment can be performed with a single puncture, and low invasiveness is achieved.

(6) At least one of the plurality of electrodes has a thinner coating only in a region corresponding to a desired portion to which a high-frequency current of a living body is to be applied in a concentrated manner. The high-frequency device according to (1), wherein the thickness of the coating changes continuously at the boundary.

The present invention corresponds to the third embodiment (FIG. 3). According to this, for example, even when a treatment is performed on a treatment site in a liver or the like, it is possible to smoothly insert the insertion electrode without moving the liver or the like.

(7) The high-frequency device according to (1), wherein the tip of at least one of the plurality of electrodes is formed of an X-ray opaque member.

The present invention corresponds to the fourth embodiment (FIG. 4). According to this, when performing a treatment under X-ray fluoroscopy, the position of the electrode in the living body can be easily grasped, so that the treatment can be performed accurately.

(8) The high-frequency device according to (1), wherein an index is provided on a surface of a covering portion of at least one of the plurality of electrodes.

The present invention corresponds to the fifth embodiment (FIG. 5). According to this, the inserted length can be visually grasped by an index such as a scale.

(9) A lubricating heat-shrinkable tube is used as the coating member, and a single coating is applied to the entire electrode by the tube, and then the second coating is left with a desired length. The high-frequency device according to the above (1), wherein the high-frequency device is configured so that the second covering portion can be appropriately peeled off by a desired length.

The present invention corresponds to the sixth embodiment (FIG. 6). According to this, an insertion electrode corresponding to various treatment ranges can be realized.

(10) A first coating portion is provided on the surface of at least one of the plurality of electrodes, a second coating portion is provided on the first coating, and the second coating portion is provided. Is movable with respect to the first covering portion.

(11) The high-frequency device according to (9), wherein at least one of the tip portion of the electrode and the second covering portion is formed of an X-ray opaque member.

The inventions (10) and (11) correspond to the seventh embodiment (FIG. 7). According to this, the effective length in which the high-frequency current should be concentrated can be quickly changed to a desired length. Further, it is suitable for treatment at the time of X-ray transmission.

(12) The high-frequency device according to (1), further comprising a linear projection at a predetermined position on the surface of the covering portion.

The present invention corresponds to the eighth embodiment (FIG. 8). According to this, it is possible to improve safety in clinical practice.

(13) The high-frequency device according to (1), further comprising a spiral projection at a predetermined position on the surface of the covering portion.

The present invention corresponds to the ninth embodiment (FIG. 9). According to this, the indwellability during treatment can be improved.

(14) The high-frequency device according to (1), wherein the surface of the covering portion is formed in a spiral shape, and further comprising a brim-shaped fixing member that meshes with the spiral covering portion.

The present invention corresponds to the tenth embodiment (FIG. 10). According to this, it is possible to prevent the insertion electrode from relatively moving in relation to the body surface.

(15) The high-frequency device according to the above (1), wherein at least one of the plurality of electrodes is formed of a rigid member and can be inserted into a living body percutaneously.

(16) The high-frequency device according to the above (1), wherein at least one of the plurality of electrodes is formed of an elastic member and is used endoscopically.

The inventions (15) and (16) correspond to the eleventh embodiment (FIG. 11). According to this, an accurate puncture ability according to the treatment method can be obtained.

(17) The high-frequency device according to (1), wherein a channel hole is provided in a part of the covering portion.

The present invention corresponds to the twelfth embodiment (FIG. 12). According to this, it is easy to reliably insert the diseased part using the guide needle.

(18) At least one of the plurality of electrodes is formed in a cylindrical shape, and a channel hole is provided in the center of the cylindrical electrode. The high-frequency device according to claim 1.

The present invention corresponds to the thirteenth embodiment (FIG. 13). According to this, it is easy to reliably insert the diseased part using the guide needle or the like.

(19) The high-frequency device according to (1), wherein at least one of the plurality of electrodes is detachable by a covering portion and a fitting member.

The present invention corresponds to the fourteenth embodiment (FIG. 14). According to this, clinical safety and economic efficiency can be improved.

(20) The high-frequency device according to (1), wherein the covering portion has a channel hole and a syringe taper, and the channel hole is filled with an electrolyte to replace the electrode. .

The present invention corresponds to the fifteenth embodiment (FIG. 15). According to this, more stable treatment and observation can be performed.

(21) The high-frequency device according to (1), wherein at least one of the plurality of electrodes is coated with a coating portion after being plated with a highly conductive material.

The present invention corresponds to the sixteenth embodiment (FIG. 16). According to this, the conductivity of the high-frequency current can be further improved.

(22) The high-frequency device according to (1), wherein at least one of the plurality of electrodes is replaceable integrally with the covering portion.

This invention corresponds to the seventeenth embodiment (FIG. 17). According to this, since the use is performed only once and the electrode is not used while being bent, the treatment safety is improved.

(23) A high-frequency power supply, a plurality of electrodes for applying a high-frequency current from the high-frequency power supply to a desired part of a living body, and a power measuring circuit for measuring power by traveling waves and reflected waves from the living body Comparing the power measured by the power measurement circuit with a predetermined threshold value, shutting off the high-frequency power supply, a control circuit for instructing a warning, and a warning circuit for performing the warning, the A high-frequency device, wherein at least one of the electrodes has a shape capable of penetrating the living body, and the electrode is covered with a covering member so as to have a non-uniform thickness.

The present invention corresponds to the eighteenth embodiment (FIG. 18). According to this, the safety of the treatment can be improved by appropriately issuing a warning.

(24) A high-frequency power supply, a plurality of electrodes for applying a high-frequency current from the high-frequency power supply to a desired part of a living body, a temperature sensor provided on at least one of the plurality of electrodes, The temperature sensor compares the measured value with a predetermined threshold, shuts off the high-frequency power supply, includes a control circuit that instructs a warning, and a warning circuit for performing the warning, and includes a warning circuit. Wherein at least one of the electrodes has a shape capable of penetrating the living body, and the electrode is covered with a covering member so as to have a non-uniform thickness.

(25) The high-frequency device according to (24), wherein the temperature sensor is disposed in a portion where the coating of the electrode is thin.

The inventions (24) and (25) correspond to the nineteenth embodiment (FIG. 19). According to this, the safety of the treatment can be improved.

(26) The high-frequency device according to the above (23), wherein a plurality of the temperature sensors are arranged in a portion other than a portion where the coating of the electrode is thinned.

This invention corresponds to the twentieth embodiment (FIG. 20). According to this, the temperature around the treatment site can be grasped, and the safety of the treatment can be improved.

(27) The above-mentioned (1), wherein the covering portion comprises a low-impedance covering portion covering a range where the high-frequency current is to be concentrated, and a high-impedance covering portion covering other portions. High frequency equipment.

This invention corresponds to the twenty-third embodiment (FIG. 23). According to this, the current can be concentrated on the portion covered with the low impedance material.

(28) The high-frequency device according to (1), wherein at least one of the plurality of electrodes has a spiral shape to substantially reduce the coating density. .

The present invention corresponds to the twenty-fourth embodiment (FIG. 24). According to this, it is possible to substantially reduce the coating density of the tip portion and concentrate the current on the portion.

(29) At least one of the plurality of electrodes is connected to a wire, and its position can be adjusted by driving the wire with a trimmer. ).

This invention corresponds to the twenty-fifth embodiment (FIG. 25). According to this, the treatment range can be specified after the insertion.

(30) The high-frequency device according to (1), wherein the plurality of electrodes constitute a multi-needle electrode, and are configured to protrude from the distal end of the catheter after being inserted into a living body.

The present invention corresponds to the twenty-sixth embodiment (FIG. 26). According to this, the same treatment range as when a plurality of needle-shaped electrodes are inserted can be obtained with a low invasive degree that only one catheter is inserted.

(31) The high-frequency device according to (1), wherein the covering portion is non-uniform in the radial direction.

This invention corresponds to the twenty-seventh embodiment (FIG. 27). According to this, the treatment range in the radial direction of the needle-shaped electrode can be made directional.

[0126]

As described in detail above, according to the present invention,
A desired site in tissue can be easily inserted, positioned, placed, and removed, and only the desired site can be heated, coagulated, cauterized, etc., and the heating and coagulation can be performed. And the like can be easily determined, and a high-frequency device with improved clinical safety can be provided.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a configuration of a high-frequency device according to a first embodiment. FIG. 1A illustrates an entire configuration of the high-frequency device according to the first embodiment, and FIG. b) shows the detailed configuration of the insertion electrode.

FIG. 2 is a diagram illustrating a configuration of an insertion electrode of a high-frequency device according to a second embodiment.

FIG. 3 is a diagram illustrating a configuration of an insertion electrode of a high-frequency device according to a third embodiment.

FIG. 4 is a diagram illustrating a configuration of an insertion electrode of a high-frequency device according to a fourth embodiment.

FIG. 5 is a diagram showing a configuration of an insertion electrode of a high-frequency device according to a fifth embodiment.

FIG. 6 is a diagram illustrating a configuration of an insertion electrode of a high-frequency device according to a sixth embodiment.

FIG. 7 is a diagram showing a configuration of an insertion electrode of a high-frequency device according to a seventh embodiment.

FIG. 8 is a diagram showing a configuration of an insertion electrode of a high-frequency device according to an eighth embodiment.

FIG. 9 is a diagram showing a configuration of an insertion electrode of a high-frequency device according to a ninth embodiment.

FIG. 10 is a diagram showing a configuration of an insertion electrode of a high-frequency device according to a tenth embodiment.

FIG. 11 is a diagram showing a configuration of an insertion electrode of a high-frequency device according to an eleventh embodiment.

FIG. 12 is a diagram showing a configuration of an insertion electrode of a high-frequency device according to a twelfth embodiment.

FIG. 13 is a diagram showing a configuration of an insertion electrode of a high-frequency device according to a thirteenth embodiment.

FIG. 14 is a diagram illustrating a configuration of an insertion electrode of a high-frequency device according to a fourteenth embodiment.

FIG. 15 is a diagram showing a configuration of an insertion electrode of a high-frequency device according to a fifteenth embodiment.

FIG. 16 is a diagram showing a configuration of an insertion electrode of a high-frequency device according to a sixteenth embodiment.

FIG. 17 is a diagram showing a configuration of a piercing electrode of a high-frequency device according to a seventeenth embodiment.

FIG. 18 is a diagram showing a configuration of a piercing electrode of a high-frequency device according to an eighteenth embodiment.

FIG. 19 is a diagram showing a configuration of a piercing electrode of a high-frequency device according to a nineteenth embodiment.

FIG. 20 is a diagram showing a configuration of an insertion electrode of a high-frequency device according to a twentieth embodiment.

FIG. 21 is a diagram showing a configuration of an insertion electrode of a high-frequency device according to a twenty-first embodiment.

FIG. 22 is a diagram showing a configuration of a piercing electrode of a high-frequency device according to a twenty-second embodiment.

FIG. 23 is a diagram showing a configuration of a piercing electrode of a high-frequency device according to a twenty-third embodiment.

FIG. 24 is a diagram showing a configuration of an insertion electrode of a high-frequency device according to a twenty-fourth embodiment.

FIG. 25 is a diagram showing a configuration of an insertion electrode of a high-frequency device according to a twenty-fifth embodiment.

FIG. 26 is a diagram showing a configuration of a piercing electrode of a high-frequency device according to a twenty-sixth embodiment.

FIG. 27 is a diagram showing a configuration of a piercing electrode of a high-frequency device according to a twenty-seventh embodiment.

FIG. 28 is a diagram showing a configuration for connecting a penetration electrode and a high-frequency cable.

FIG. 29 is a diagram showing the configuration of FIG. 28 in more detail.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 High frequency electrode 2 Matching circuit 3 Insertion electrode 4 External electrode 5 Treatment part 6 Living body 7 Coating part 8 Stainless steel electrode needle

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Norihiko Haruyama, Inventor Olympus Optical Co., Ltd. 2-43-2 Hatagaya, Shibuya-ku, Tokyo

Claims (1)

[Claims] 1. A high-frequency device having a high-frequency power supply and a plurality of electrodes for applying a high-frequency current from the high-frequency power supply to a desired part of a living body, wherein at least one of the plurality of electrodes is inserted into the living body. A high-frequency device having a shape capable of being inserted into the electrode and coating the electrode with a coating material so that at least the tip of the electrode has low electrical insulation.