JP2007021024A - High frequency treatment instrument - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high frequency treatment instrument having firm connection between an electrode part and an electric insulation part and having a treatment part with a low cost constitution. <P>SOLUTION: This high frequency treatment instrument 2 is provided with the treatment part which has the treatment electrode part 17 for executing a high frequency treatment of a biotissue with its projecting from an insertion tube 12 having electric insulation, and the electric insulation part 18 having a diameter larger than the diameter dimension of the treatment electrode part 17 at the distal end of the treatment electrode part 17; and the treatment electrode part 17 and the electric insulation part 18 are integrally constituted by integral molding. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a high-frequency treatment instrument that is inserted into a body cavity and incises or coagulates a living tissue such as a mucous membrane with high frequency.

  In recent years, a trocar that guides the endoscope for observation into the body cavity and a trocar that guides the treatment tool to the treatment site without laparotomy in order to reduce the invasion to the patient, and puncture the abdomen of the patient. Laparoscopic surgery is performed in which therapeutic treatment is performed while observing a treatment tool and a treatment site with a mirror. In this method, a high-frequency treatment apparatus including a high-frequency power supply device that performs a treatment such as incision or coagulation of a living tissue by flowing a high-frequency current through the living tissue is used. Further, even in an endoscope having flexibility in an insertion portion inserted from the oral cavity, anus, etc., a high-frequency treatment instrument is introduced into a body cavity via a treatment instrument insertion channel provided in the endoscope. Thus, treatments such as incision and coagulation of living tissue can be performed.

  In the high-frequency treatment instrument, incision or cauterization such as coagulation is performed when the energized electrode touches the mucous membrane. And when performing a treatment with a high frequency treatment instrument, it is set as the state which the electrode protruded from the front-end | tip of an electrically insulating sheath. For example, when the operator coagulates the mucous membrane, an electrode to which a high-frequency current is applied is brought into contact with the mucosa. By this, the mucous membrane can be coagulated. On the other hand, when performing incision, an electrode to which a high-frequency current is applied is moved along a predetermined excision direction. As a result, incision and excision of the mucous membrane can be performed.

  When performing an incision with a high-frequency treatment instrument, the operator moves the electrode while maintaining a certain depth so that the electrode does not contact the non-excised tissue located deep in the site to be excised. Resection must be done. In this way, a technique for excising only the excision-handling site by moving the electrode while maintaining a certain depth is one of skillful techniques.

Japanese Patent Application Laid-Open No. 8-299355 discloses a high-frequency knife that can prevent insertion of a deep tissue that should not be incised and unnecessary cauterization during incision of a mucous membrane. In this high-frequency knife, an insulating tip having a diameter larger than that of the knife is provided at the protruding tip of the electrode knife.
JP-A-8-299355

  However, in the high-frequency knife of Patent Document 1, a step of fitting a knife having a bulging portion at the tip thereof into a through hole provided in an insulating chip having a spherical surface at the tip portion, and a bulging portion of the knife are arranged. An insulating chip is integrally provided at the protruding tip of the electrode knife through a step of applying and fixing a sealing agent to the recessed portion. For this reason, it is not only troublesome and time-consuming to integrally provide the insulating tip at the protruding tip of the electrode knife, but the yield is poor and the cost is increased. In addition, it is difficult to form an insulating chip having a recess and a through hole at low cost.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a high-frequency treatment instrument including a treatment portion having a low-cost configuration in which the bonding property between an electrode and an electrical insulating portion is strong.

  The high-frequency treatment instrument of the present invention includes a treatment electrode portion that performs high-frequency treatment of a living tissue in a state of protruding from an insertion portion having electrical insulation, and a distal end of the treatment electrode portion. In the high-frequency treatment instrument having a treatment portion including an electrical insulation portion having a diameter larger than the diameter, the treatment electrode portion and the electrical insulation portion are integrally formed by integral molding.

  According to this configuration, the treatment portion provided with the large-diameter electrical insulating portion at the distal end portion of the treatment electrode portion is efficiently produced by integral molding.

ADVANTAGE OF THE INVENTION According to this invention, the high frequency treatment tool provided with the treatment part of the structure with the strong connection property of an electrode and an electrical insulation part and cheapness is realizable.

Embodiments of the present invention will be described below with reference to the drawings.
1 to 8 relate to one embodiment of the present invention, FIG. 1 is a diagram for explaining the configuration of a high-frequency treatment apparatus, FIG. 2 is a diagram for explaining the configuration of a high-frequency knife as a high-frequency treatment instrument, and FIG. FIG. 4 is a diagram illustrating another configuration example of the retaining portion provided in the treatment electrode portion with attachment, FIG. 4 is a diagram illustrating another configuration of the retaining portion provided in the treatment electrode portion with insulation, and FIG. FIG. 6 illustrates a state in which the treatment electrode portion is disposed on the mold, and FIG. 6 illustrates a state in which the movable mold is disposed at the molding position with respect to the fixed mold on which the treatment electrode portion is disposed and the molding material is filled. FIG. 7 is a view for explaining a state in which the treatment electrode portion with an insulating portion with a runner is taken out from the fixed mold, and FIG. 8 is a configuration example of the treatment electrode portion with an insulating portion in consideration of incision ability and rigidity. FIG.

  As shown in FIG. 1, the high-frequency treatment device 1 includes a high-frequency treatment instrument 2 and a high-frequency power source 3. A high-frequency treatment tool 2 shown in the figure is a high-frequency knife, and cuts off a living tissue by supplying a high-frequency current to the living tissue. The high frequency power supply 3 supplies a high frequency current to the high frequency treatment instrument 2. The high frequency power source 3 includes a high frequency generation circuit that generates a high frequency and an HF output amplifier that amplifies the power of the high frequency. Two output terminals of the HF output amplifier are connected to the active electrode 3a and the patient electrode 3b.

  The high-frequency treatment instrument 2 and the high-frequency power source 3 are electrically connected via an active cord 4. Specifically, one end portion of the active cord 4 is detachably connected to an electrical connection portion 5 provided in the high-frequency treatment instrument 2, and the other end portion is an active cord connection portion provided in the high-frequency power source 3. Connected to the active electrode 3a.

  The high-frequency treatment instrument 2 is introduced into, for example, the abdominal cavity 6 a via a trocar 7 inserted into the abdomen of the patient 6. For example, a counter electrode 8 configured to come into contact with a wide area is disposed on the back side of the patient 6. A counter electrode plate cord 8 a extends from the counter electrode plate 8, and its end is connected to a patient electrode 3 b that is a counter electrode plate connecting portion of the high-frequency power source 3.

  A connection cord 9 a extending from the foot switch 9 is connected to the high frequency power source 3. A high-frequency current is supplied from the high-frequency power source 3 to the high-frequency treatment instrument by turning on the pedal portion 9b of the foot switch 9, and the supply of the high-frequency current is stopped by turning off the pedal portion 9b.

  Specifically, when the pedal portion 9b of the foot switch 9 is turned on by the surgeon, the high-frequency current is generated from the active electrode 3a, the active cord 4, the electrical connection portion 5, and a treatment electrode (described later) of the high-frequency treatment instrument 2. The flow flows so as to return to the patient electrode 3b through the counter electrode plate 8.

  As shown in FIG. 2, the high-frequency treatment instrument 2 includes a gripping part 11, an insertion part 12, and a treatment part 13. The insertion portion 12 protrudes from the distal end surface of the grip portion 11 by a predetermined amount, and the treatment portion 13 protrudes from the distal end surface of the insertion portion 12 by a predetermined amount.

  The insertion portion 12 is rigid and includes an insertion portion main body 14, a connection tube 15, and an electrode fixing member 16. The insertion portion main body 14 constitutes the outermost exterior of the insertion portion 12 and is made of an insulating resin member such as ceramic or Teflon (registered trademark). The connecting pipe 15 is made of, for example, stainless steel having conductivity. The electrode fixing member 16 is a cylindrical member made of, for example, stainless steel having conductivity.

  For example, an electrical connection 5 is provided on the side of the grip 11. A connector portion 4 a provided at one end of the active cord 4 is detachably connected to the electrical connection portion 5. The electrical connection part 5 is mainly composed of an electrical contact part 5a having conductivity and an insulating part 5b having insulation.

  The electrode fixing member 16 is integrally fixed to the distal end portion of the connection pipe 15. As a result, the electrode fixing member 16 and the connecting pipe 15 are electrically connected. Further, a treatment electrode portion 17 constituting the treatment portion 13 is integrally fixed to the electrode fixing member 16 by, for example, screwing. As a result, the electrode fixing member 16 and the treatment electrode portion 17 are electrically connected.

  The distal end portion of the connecting tube 15 is integrally disposed in the insertion portion main body 14 so as not to protrude from the distal end surface of the insertion portion main body 14, in other words, a predetermined amount of the connection tube 15 is depressed from the distal end surface. A proximal end portion of the connecting pipe 15 is fixed integrally to the grip portion 11. An electrical contact portion 5 a constituting the electrical connection portion 5 provided in the grip portion 11 is electrically connected to the proximal end portion of the connection pipe 15. Therefore, the electrical connection portion 5 and the treatment electrode portion 17 are electrically connected via the connection tube 15 and the electrode fixing member 16.

  The treatment portion 13 includes a treatment electrode portion 17 and an electrical insulation portion 18. The treatment electrode portion 17 is made of a conductive metal member such as stainless steel and has a relatively small diameter, and performs a high frequency incision treatment. On the other hand, the electric insulating portion 18 is a bulging electric insulating portion, and is a heat-resistant electric insulating member such as a resin member or ceramic, and has a diameter larger than that of the treatment electrode portion 17. The distal end side portion of the electrical insulating portion 18 is configured in a curved surface shape, for example, a hemispherical shape in consideration of contact with a living tissue. A retaining portion is provided on the distal end side portion of the treatment electrode portion 17. The retaining portion includes, for example, a convex portion 17b as shown in FIG. 3 or a concave portion 17c as shown in FIG. Therefore, as will be described later, by providing the electrical insulating portion 18 as shown by the alternate long and short dash line so as to cover the retaining portion provided in the treatment electrode portion 17 by integral molding, the electrical insulation portion 18 becomes the treatment electrode portion. It is surely prevented from falling off from 17. Reference numeral 17a denotes a male screw portion. The male screw portion 17 a is screwed into a female screw portion provided on the electrode fixing member 16.

  Instead of integrally configuring the treatment electrode portion 17 and the electrode fixing member 16 by screwing, the electrode fixing member and the treatment electrode portion may be configured integrally with the same member.

The integral formation process of the treatment part 13 is demonstrated with reference to FIG. 5 thru | or FIG.
First, as shown in FIG. 5, for example, an operator causes the base end portion of the treatment electrode portion 17 to face the electrode portion arrangement hole 21 a of the fixed mold 21 as indicated by a broken line. Thereafter, the operator arranges the treatment electrode portion 17 in the electrode portion arrangement hole 21a as indicated by a solid line. Thereafter, the operator operates the molding apparatus. Then, the moving mold 22 is moved to the molding position as indicated by the two-dot chain line, and the parting surface of the moving mold 22 and the parting surface of the fixed mold 21 are brought into close contact with each other. In this close contact state, the convex portion 17 b of the treatment electrode portion 17 is disposed at a predetermined position in the electrical insulating portion forming space 23 constituted by the fixed die 21 and the movable die 22.

  In the present embodiment, the electrode portion arrangement hole 21a includes, for example, a sleeve pin 24 and a first protruding pin 25. The sleeve pin 24 is formed with a through hole corresponding to the diameter of the treatment electrode portion 17 and the first protruding pin 25. The first protruding pin 25 is formed to have a predetermined length so as to correspond to the length of the treatment electrode portion 17 disposed in the electrode portion disposing hole 21a. The 1st protrusion pin 25 is used when removing the electrode part 17 for treatment arrange | positioned at the electrode part arrangement | positioning hole 21a from the electrode part arrangement | positioning hole 21a. Reference numeral 26 denotes an insulating member supply channel (hereinafter referred to as a runner), to which a molten resin member constituting the electrical insulating portion 18 is supplied. Reference numeral 26a denotes a gate (also referred to as a gate), and a molten resin member is filled from the runner 26 into the electrical insulating portion forming space 23 through the gate 26a. Reference numeral 27 denotes a second protruding pin, which is used when the runner member (reference numeral 28a in the figure) cooled and solidified in the runner 26 is taken out from the runner 26 of the fixed mold 21.

  Next, the molten resin member is filled into the electrical insulating portion forming space 23 through the gate 26a. Then, as shown in FIG. 6, a predetermined amount of molten resin member 28 is filled in the electric insulation portion forming space 23. Here, filling of the resin member 28 is stopped, and cooling is performed by applying a predetermined pressure for a predetermined time. Then, the melted resin member 28 is solidified. After solidification, the moving mold 22 is moved again to a predetermined position.

  Next, when the movement of the moving mold 22 is completed, the first protrusion pins 25 and 27 are operated, and the treatment electrode portion 17 is moved from the electric insulation portion forming space 23 and the electrode portion arrangement hole 21a as shown in FIG. The treatment portion 13 provided with the electrical insulating portion 18, the runner 26, and the gate 26 a to the runner portion 28 a are released from the fixed mold 21. At this time, the runner portion 28a is integrally provided on the electrical insulating portion 18 provided integrally with the distal end portion of the treatment electrode portion 17. Thereafter, the worker separates the runner portion 28a and the electrical insulating portion 18 by hand, for example. As a result, the treatment portion 13 in which the electrical insulating portion 18 is integrated with the treatment electrode portion 17 shown in FIG. 3 is obtained.

  As a result, according to the high-frequency treatment instrument 2 including the treatment portion 13, when the pedal portion 9b of the foot switch 9 is turned on by the surgeon, the high-frequency current is generated by the active electrode 3a, the active cord 4, the connector portion 4a, It flows so as to return to the patient electrode 3b through the counter electrode 8 from the electrical contact portion 5a, the connecting tube 15, the electrode fixing member 16, and the treatment electrode portion 17 of the treatment portion 13.

As described above, the treatment portion including the electrical insulation portion and the treatment electrode portion is formed by integral molding, so that the treatment portion having improved bonding strength between the electrical insulation portion and the treatment electrode portion can be stably and inexpensively. Can get to. As a result, in the high-frequency treatment instrument provided with this treatment portion, when the incision is made by moving the treatment electrode portion while hooking the bulging electrical insulation portion on the tissue, the bulging electrical insulation portion is caused by the load applied from the tissue. It is surely prevented from being broken or falling off from the treatment electrode part.
In the present embodiment, the insertion portion 12 of the high-frequency treatment instrument 2 is rigid, but the insertion portion of the high-frequency treatment instrument may be configured to be flexible.

  As shown in FIG. 8, the treatment portion 13A may be configured by continuously changing, for example, the diameter of the distal end side of the treatment electrode portion 17A. FIG. 8 is a diagram for explaining another configuration example of the treatment electrode portion constituting the treatment portion.

  As shown in the figure, in the treatment portion 13A of the present embodiment, a tapered surface portion 31 is provided on the distal end side of the treatment electrode portion 17A. Therefore, in the treatment electrode portion 17A, the cross-sectional area changes so as to continuously increase from the distal end side to the vicinity of the proximal end portion. Other configurations are the same as those of the above-described embodiment, and the same members are denoted by the same reference numerals and description thereof is omitted.

  In the treatment portion 13A having this configuration, the distal end side portion 31a including the tapered surface portion 31 of the treatment electrode portion 17A is in contact with the tissue, and the proximal end side portion 32 of the treatment electrode portion 17A is brought into contact with the tissue. When the state is compared, the contact area between the distal end side portion 31a and the tissue is smaller than the contact area between the proximal end side portion 32 and the tissue. Therefore, in the treatment electrode portion 17A of the treatment portion 13A, the cutting ability is improved without reducing the mechanical strength.

  As a result, according to the high-frequency treatment tool including the treatment portion 13A having the treatment electrode portion 17A, when the pedal portion 9b of the foot switch 9 is turned on by the operator, the high-frequency current is generated from the active electrode 3a and the active code. 4, the connector part 4a, the electrical contact part 5a, the connecting tube 15, the electrode fixing member 16, and the taper surface part 31 of the treatment electrode part 17A constituting the treatment part 13A to return to the patient electrode 3b via the counter electrode 8 Flowing into.

  In this way, by forming the treatment portion including the bulging electrical insulation portion and the treatment electrode portion by integral molding, the diameter size and the electrode shape of the electrode portion can be designed relatively freely and have desired characteristics. A treatment portion provided with a treatment electrode portion can be obtained. Other operations and effects are the same as in the above embodiment.

  Further, the configuration of the treatment portion is not limited to the configuration of the treatment electrode portion 17 and the electrical insulating portion 18, but the treatment portion having the configuration shown in FIGS. 9 to 11 or the configuration shown in FIGS. It may be a treatment part.

  Another configuration of the treatment section will be described with reference to FIGS. 9 is a diagram illustrating the configuration of the treatment section and the configuration of the treatment electrode section constituting the treatment section, FIG. 10 is a front view illustrating the configuration of the treatment section, and FIG. 11 is an electrode section of a fixed mold. It is a figure explaining the state which has arrange | positioned the treatment electrode part in the arrangement | positioning hole.

  As shown in FIG. 9, the treatment portion 13 </ b> B of the present embodiment includes a bulging portion 41 and a rod-like portion 42. The bulging portion 41 is constituted by a bulging electrical insulating portion 18A. The rod-shaped portion 42 is configured to include the treatment electrode portion 17B and the conductive portion covering insulating portion 18B. In the treatment portion 13 </ b> B, treatment electrode portions 17 </ b> B are provided on the outer surface on the proximal end surface side of the bulging portion 41 and the distal end portion side of the rod-like portion 42. In the rod-shaped portion 42, the treatment electrode portion 17B is provided circumferentially with a predetermined width dimension.

  The treatment electrode portion 17 </ b> B is configured as an annular electrode 43. The annular electrode 43 is provided with a conductive portion 44 for supplying a high frequency current. In the present embodiment, the annular electrode 43 includes a flange portion 43a and a tube portion 43b. The conductive portion 44 has a small diameter so that it can be disposed in the tube portion 43b. For example, a pair of tip protrusions 44 a that protrude a predetermined amount in a direction orthogonal to the longitudinal axis are provided on the tip side of the conductive portion 44. As shown in FIG. 10, the outer surface of the tip convex portion 44 a is electrically joined to the inner peripheral surface 43 c of the tube portion 43 b constituting the annular electrode 43 by, for example, solder.

  On the outer peripheral surface side of the conductive portion 44 protruding from the tube portion 43b of the annular electrode 43, the conductive portion covering insulating portion 18B is provided substantially evenly over the entire circumference. That is, the conductive portion 44 is provided in the central portion in the longitudinal direction of the conductive portion covering insulating portion 18B. The base end side portion of the conductive portion 44 is configured as a male screw portion 17 a that constitutes the base end portion of the rod-like portion 42.

  As shown in FIG. 11, the annular electrode 43 constituting the treatment electrode portion 17B and the male screw portion 17a constituting the conductive portion 44 and the rod-like portion 42 are arranged in the electrode portion arrangement hole 21b of the fixed mold 21A. In this arrangement state, the flange portion 43 a of the annular electrode 43 is arranged in the tip recess 24 a of the sleeve pin 24. Further, the outer peripheral surface of the tube portion 43b of the annular electrode 43 is disposed in close contact with the inner peripheral surface of the electrode portion arrangement hole 21b. Further, the base end portion of the rod-like portion 42 provided with the male screw portion 17a is also arranged in close contact with the electrode portion arrangement hole 21b. Then, when the moving mold 22 is moved to the molding position as shown by the two-dot chain line, and the parting surface of the moving mold 22 and the parting surface of the fixed mold 21A are in close contact with each other, A portion indicated by hatching is configured as an electrical insulating portion forming space 23A.

  The electrical insulating portion forming space 23A is filled with a resin member. Thereafter, the treatment portion 13B provided with the bulging electrical insulation portion 18A, the treatment electrode portion 17B, and the conductive portion covering insulation portion 18B and the runner member are released from the fixed mold 21A, and the runner member and the bulge electrical insulation portion are released. 18A is separated. As a result, as shown in FIG. 9, the treatment portion 13B having the bulging electrical insulation portion 18A, the treatment electrode portion 17B, and the conductive portion covering insulation portion 18B can be obtained.

  As a result, according to the high-frequency treatment tool including the treatment portion 13B provided with the treatment electrode portion 17B, when the pedal portion 9b of the foot switch 9 is turned on by the operator, the high-frequency current is generated from the active electrode 3a and the active electrode 3a. The cord 4, the connector part 4a, the electrical contact part 5a, the connection tube 15, the electrode fixing member 16, the conductive part 44, and the treatment electrode part 17B are returned to the patient electrode 3b via the counter electrode 8 from the annular electrode 43. Flowing into.

  As described above, the treatment electrode portion is constituted by the annular electrode and the conductive portion electrically joined to the annular electrode, so that a predetermined width is provided on the outer peripheral surface on the distal end side of the rod-like portion constituting the treatment portion. Dimensional circumferential electrode portions can be disposed. Further, the treatment portion is composed of the bulging portion and the rod-like portion, and the conductive portion is provided in the central portion of the rod-like portion, whereby the rigidity of the treatment portion can be improved.

  In addition, in this embodiment, although the structure which provides a collar part in the annular electrode which comprises an electrode part is shown, you may make it comprise an annular electrode only by a pipe part, without providing a collar part. Accordingly, the circumferential electrode portion having a predetermined width can be disposed at a predetermined position on the outer peripheral surface of the rod-shaped portion constituting the treatment portion. In the present embodiment, since the annular electrode 43 is sandwiched between the bulging electrical insulating portion 18A and the conductive portion covering insulating portion 18B, the annular electrode also serves as a retaining portion for the insulating portion.

  Another configuration of the treatment section will be described with reference to FIGS. 12 is a diagram for explaining the configuration of the treatment section and the configuration of the treatment electrode section, FIG. 13 is a cross-sectional view of the treatment electrode section of the treatment section of FIG. 12 cut along line XIII-XIII, and FIG. It is a figure explaining the state which has arrange | positioned the electrode part for treatment in the electrode part arrangement | positioning hole of a fixed metal mold | die.

  As shown in FIGS. 12 and 13, the treatment portion 13C of the present embodiment includes a bulging portion 41A and a rod-like portion 42A. The bulging portion 41A is constituted by a bulging electrical insulating portion 18C. The rod-shaped portion 42A includes a treatment electrode portion 17C and an electrode covering insulating portion 18D. In the treatment portion 13C, an elongated treatment electrode portion 17C having a predetermined width dimension is provided in the longitudinal direction of the side surface of the rod-like portion 42A. The treatment electrode portion 17 </ b> C is configured as a columnar electrode 45 provided with a convex portion 45 a protruding in a direction orthogonal to the longitudinal direction in the longitudinal direction. The columnar electrode 45 is provided with a recess 45b serving as a retaining portion.

  As shown in FIG. 13, the outer surface of the rod-shaped portion 42 </ b> A is constituted by the convex portion 45 a of the cylindrical electrode 45 and the electrode coating insulating portion 18 </ b> D. That is, around the cylindrical electrode 45, the electrode covering insulating portion 18D is provided so that only the outer peripheral surface portion of the convex portion 45a of the cylindrical electrode 45 is exposed. In addition, the base end side part of the electroconductive part 44 is comprised as the external thread part 17a which comprises the base end part of 42 A of rod-shaped parts.

  As shown in FIG. 14, the columnar electrode 45 constituting the treatment electrode portion 17C is disposed in the electrode portion arrangement hole 21c of the fixed mold 21B. In this arrangement state, the outer peripheral surface portion of the convex portion 45a of the cylindrical electrode 45 is disposed in close contact with the inner peripheral surface of the electrode portion arrangement hole 21c. Further, the base end portion of the rod-like portion 42A having the male screw portion 17a is also closely attached to the electrode portion arrangement hole 21c. When the moving mold 22 is moved to the molding position as indicated by the two-dot chain line, and the parting surface of the moving mold 22 and the parting surface of the fixed mold 21B are in close contact with each other, A portion indicated by hatching is configured as an electrical insulating portion forming space 23B.

  The electrical insulating portion forming space 23B is filled with a resin member. Thereafter, the bulging electrical insulation portion 18C, the treatment electrode portion 17C, and the treatment portion 13C provided with the electrode covering insulation portion 18D and the runner member are released from the fixed mold 21B, and the runner member and the bulge electrical insulation portion 18C are released. And are separated. As a result, as shown in FIG. 12, the treatment portion 13C including the bulging electrical insulation portion 18C, the treatment electrode portion 17C, and the electrode covering insulation portion 18D can be obtained.

  As a result, according to the high-frequency treatment tool including the treatment portion 13C provided with the treatment electrode portion 17C, when the pedal portion 9b of the foot switch 9 is turned on by the operator, the high-frequency current is generated from the active electrode 3a and the active electrode 3a. Return from the convex part 45a of the cylindrical electrode 45 constituting the cord 4, the connector part 4a, the electrical contact part 5a, the connection tube 15, the electrode fixing member 16, and the treatment electrode part 17C to the patient electrode 3b via the counter electrode 8 To flow.

  In this way, by configuring the treatment electrode portion with a cylindrical electrode having a convex portion, a longitudinal electrode portion having a predetermined width dimension is disposed on a desired outer peripheral surface of the rod-like portion constituting the treatment portion. Can do. Moreover, the rigidity of the treatment portion can be improved by adopting a configuration in which the outer peripheral surface portion of the convex portion provided on the cylindrical electrode portion is exposed at a part of the rod-like portion. In the present embodiment, the incision ability can be adjusted by appropriately setting the width dimension of the convex portion.

  By the way, in the embodiment described above, a configuration is shown in which the bulging electrical insulation portion is provided on the distal end side of the treatment electrode portion by integrally forming the treatment portion, but the bulging electrical insulation portion of the treatment portion is shown in FIG. The configuration may be as shown in FIG. FIG. 15 is a view showing a treatment portion having a configuration in which an electrical insulator is provided at the distal end portion of the treatment electrode portion, and FIG. 16 is a view showing a treatment portion in which the distal end portion of the treatment electrode portion is coated with an electrical insulator. It is.

  The treatment portion 13D shown in FIG. 15 includes an electrode 51 that constitutes a treatment electrode portion, and a bulge portion covering insulator cover 52 that constitutes an electrical insulation portion. The electrode 51 includes a bulging portion 51a and a treatment electrode portion 51b. The bulging portion 51a has a diameter larger than the outer diameter size of the treatment electrode portion 51b and has a curved surface at the tip side portion, and is formed in, for example, a hemispherical shape. The bulging portion covering insulator cover 52 includes a pair of insulating cover members 52a. The insulating cover member 52a is made of a ceramic material having excellent heat resistance, and is configured to have a predetermined thickness so as to cover the hemispherical shape portion of the bulging portion 51a and the outer shape portion constituted by the base end surface. The pair of insulating cover members 52a is covered and joined to the bulging portion 51a of the electrode 51 by, for example, brazing. Reference numeral 51c is a male screw portion. The male screw portion 51 c is screwed into a female screw portion provided on the electrode fixing member 16.

  According to this configuration, a pair of insulating cover members 52a formed of a ceramic material are joined to the bulging portion 51a of the electrode 51 to provide the bulging portion covering insulator cover 52, thereby constituting the treatment portion 13D having an electric insulating portion. ing. As a result, it is possible to obtain a treatment portion with improved bonding strength between the electrical insulating portion and the treatment electrode portion.

  In the treatment portion 13E shown in FIG. 16, instead of providing the bulging portion covering insulator 52 on the bulging portion 51a of the electrode 51, an electrical insulating covering portion 53 having a predetermined thickness dimension is provided on the surface of the bulging portion 51a. May be. The electrically insulating coating portion 53 is a ceramic coating agent or a fluororesin coating agent having excellent heat resistance.

  The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the invention.

1 to 8 relate to one embodiment of the present invention, and FIG. 1 is a diagram for explaining the configuration of a high-frequency treatment apparatus. The figure explaining the structure of the high frequency knife which is a high frequency treatment tool The figure explaining one structural example of the retaining part provided in the treatment electrode part with an insulation part The figure explaining the other structure of the retaining part provided in the electrode part for treatment with an insulating part. The figure explaining the state which has arrange | positioned the electrode part for treatment to a fixed metal mold | die The figure explaining the state which has filled the molding material by arrange | positioning a movement metal mold | die in a molding position with respect to the fixed metal mold | die with which the treatment electrode part is arrange | positioned The figure explaining the state which took out the electrode part for treatment with an insulating part with a runner from a fixed metal mold The figure explaining the example of composition of the electrode part for treatment with an insulating part in consideration of cutting ability and rigidity 9 to 11 are diagrams for explaining other configurations of the treatment section, and FIG. 9 is a diagram for explaining the configuration of the treatment section and the configuration of the treatment electrode section constituting the treatment section. Front view explaining the configuration of the treatment section The figure explaining the state which has arrange | positioned the electrode part for treatment in the electrode part arrangement | positioning hole of a fixed metal mold | die FIGS. 12 to 14 are diagrams illustrating another configuration of the treatment section, and FIG. 12 is a diagram illustrating the configuration of the treatment section and the configuration of the treatment electrode section. Sectional drawing which cut | disconnected the electrode part for treatment of the treatment part of FIG. 12 by the XIII-XIII line | wire The figure explaining the state which has arrange | positioned the electrode part for treatment in the electrode part arrangement | positioning hole of a fixed metal mold | die The figure which shows the treatment part of a structure which provides an electrical insulator in the front-end | tip part of the treatment electrode part The figure which shows the treatment part which applied the coating of the electrical insulator to the front-end | tip part of the treatment electrode part

Explanation of symbols

2 ... High-frequency treatment instrument
11 ... Gripping part
12 ... Insertion section
13 ... treatment section
17 ... Treatment electrode
17b ... convex part 18 ... electric insulation part

Claims (2)

A treatment electrode portion that performs high-frequency treatment of a living tissue in a state of protruding from an insertion portion having electrical insulation, and electrical insulation having a diameter larger than the outer diameter of the treatment electrode portion at the distal end of the treatment electrode portion In a high-frequency treatment instrument having a treatment part comprising a part,
The high-frequency treatment instrument, wherein the treatment electrode portion and the electrical insulating portion are integrally formed by integral molding.   The high-frequency treatment instrument according to claim 1, wherein the treatment electrode portion includes a retaining portion that prevents the electrical insulating portion from falling off at a part of the treatment electrode portion.

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