Ultrasonic treatment tool

Abstract

This ultrasonic treatment tool comprises: an ultrasonic blade 13 that supplies ultrasonic vibrations and high-frequency current to biological tissue; a jaw 11 that opens and closes relative to the ultrasonic blade 13; a holder member 14 that is provided to be able to pivot relative to the jaw 11; and an abutment member 12 that is provided on the holder member 14, is made of a first resin material, and abuts against the ultrasonic blade 13 when the jaw 11 is closed relative to the ultrasonic blade 13. The holder member 14 is at least partially made of a second resin material, and has an electrode EP that supplies high-frequency current to at least a part of a contact surface that comes into contact with the biological tissue.

Description

Ultrasonic Treatment Device

[0001] The present invention relates to an ultrasonic treatment device.

[0002] Conventionally, ultrasonic treatment devices have been known that treat a target area in biological tissue (hereinafter referred to as the target) by supplying ultrasonic vibrations and high-frequency current as treatment energy to the target area (see, for example, Patent Document 1).

[0003] The ultrasonic treatment device described in Patent Document 1 includes an ultrasonic blade, jaws, and abutment member as shown below. The ultrasonic blade supplies ultrasonic vibrations and high-frequency current to the treatment target. The jaws open and close relative to the ultrasonic blade. The jaws are provided with electrodes that supply high-frequency current to the treatment target. The abutment member is made of a resin material and is provided on the jaws. The abutment member abuts against the ultrasonic blade when the jaws are closed relative to the ultrasonic blade.

[0004] US Patent Application Publication No. 2021 / 0196334

[0005] However, in ultrasonic treatment instruments, repeated output of ultrasonic vibrations can cause wear of the contact member. When the contact member wears out in this way, the distance between the ultrasonic blade and the jaw-side electrode becomes smaller, and the ultrasonic blade may come into contact with the electrode. In other words, contact between the ultrasonic blade and the electrode may affect the lifespan of the ultrasonic blade.

[0006] The present invention has been made in view of the above, and has an object to provide an ultrasonic treatment device that can reduce the impact on the life of an ultrasonic blade.

[0007] In order to solve the above-mentioned problems and achieve the object, the ultrasonic treatment device of the present invention comprises an ultrasonic blade that supplies ultrasonic vibrations and high-frequency current to biological tissue, respectively, a jaw that opens and closes relative to the ultrasonic blade, a holder member that is swingably attached to the jaw, and an abutment member that is attached to the holder member and made of a first resin material that abuts against the ultrasonic blade when the jaw is closed relative to the ultrasonic blade, and the holder member is at least partially made of a second resin material and has an electrode that supplies the high-frequency current to at least a portion of the contact surface that comes into contact with the biological tissue.

[0008] According to the ultrasonic treatment device of the present invention, the influence on the life of the ultrasonic blade can be reduced.

[0009] Fig. 1 is a diagram showing a treatment system according to an embodiment. Fig. 2 is a diagram explaining the configuration of a tip portion of an ultrasonic treatment instrument. Fig. 3 is a diagram explaining the configuration of a tip portion of an ultrasonic treatment instrument. Fig. 4 is a diagram explaining the configuration of a jaw. Fig. 5 is a diagram explaining the configuration of a holder member. Fig. 6 is a diagram explaining a modified example of the embodiment.

[0010] Hereinafter, a mode for carrying out the present invention (hereinafter referred to as an embodiment) will be described with reference to the drawings. Note that the present invention is not limited to the embodiment described below. Furthermore, in the description of the drawings, the same parts are given the same reference numerals.

[0011] [Overall Configuration of Treatment System] Fig. 1 is a diagram showing a treatment system 1 according to an embodiment. The treatment system 1 applies treatment energy to a region of biological tissue to be treated (hereinafter referred to as a treatment target), thereby treating the treatment target. The treatment energy in this embodiment is ultrasonic energy and high-frequency energy. Treatments that can be performed by the treatment system 1 according to this embodiment include coagulation (sealing) of the treatment target, incision of the treatment target, and the like. Coagulation and incision may also be performed simultaneously. As shown in Fig. 1, this treatment system 1 includes a treatment tool 2 and a control device 3.

[0012] [Configuration of Treatment Tool] In the following, one side along the central axis Ax1 (FIG. 1) of the outer pipe 10 will be referred to as the distal side Ar1, and the other side will be referred to as the proximal side Ar2. Furthermore, the "width direction" described below refers to a direction perpendicular to the central axis Ax1 and the opening / closing direction of the jaw 11 relative to the treatment portion 131, and is also a direction perpendicular to the plane of the paper in FIG.

[0013] 2 and 3 are diagrams illustrating the configuration of the distal end portion of the treatment tool 2. Specifically, Fig. 2 is a perspective view showing the distal end portion of the treatment tool 2. Fig. 3 is a cross-sectional view of the distal end portion of the treatment tool 2 cut along a plane perpendicular to the central axis Ax1.

[0014] The treatment tool 2 is an ultrasonic treatment tool according to the present invention. The treatment tool 2 applies ultrasonic energy and high-frequency energy to a treatment target, thereby treating the treatment target. As shown in FIG. 1 , the treatment tool 2 includes a handpiece 4 and an ultrasonic transducer 5.

[0015] As shown in Figures 1 to 3, the handpiece 4 includes a fixed handle 6 (Figure 1), an operating handle 7 (Figure 1), a switch 8 (Figure 1), a rotating knob 9 (Figure 1), an outer pipe 10 (Figures 1 and 2), a jaw 11, a holder member 14 (Figures 2 and 3), a contact member 12 (Figure 3), and an ultrasonic blade 13.

[0016] The fixed handle 6 supports the entire treatment tool 2 and is a part that is held by an operator (user) such as a surgeon.

[0017] The operating handle 7 is movably attached to the fixed handle 6 and receives opening and closing operations by an operator such as a surgeon.

[0018] The switch 8 is provided in an exposed state on the outside of the fixed handle 6 and receives treatment operations from an operator such as a surgeon.

[0019] The rotation knob 9 has a generally cylindrical shape coaxial with the central axis Ax1 and is provided on the distal end side Ar1 of the fixed handle 6. The rotation knob 9 is rotated by an operator such as a surgeon. This rotation causes the rotation knob 9 to rotate about the central axis Ax1 relative to the fixed handle 6. Furthermore, the rotation of the rotation knob 9 causes the outer pipe 10, jaw 11, holder member 14, abutment member 12, and ultrasonic blade 13 to rotate about the central axis Ax1.

[0020] The outer pipe 10 has a tubular shape and corresponds to a pipe according to the present invention. In this embodiment, the outer pipe 10 is a cylindrical pipe made of a conductive material such as metal.

[0021] A first pin Pi1 (FIGS. 1 and 2) is fixed to the end of the tip side Ar1 of the outer pipe 10. The first pin Pi1 has a cylindrical shape extending in a direction perpendicular to the plane of the paper in Fig. 1 and engages with the jaw 11 to rotatably support the jaw 11. In this embodiment, the first pin Pi1 is made of a conductive material such as metal.

[0022] The outer peripheral surface of the outer pipe 10 is covered with an electrically insulating outer tube (not shown). A tubular inner pipe PI ( FIG. 2 ) is inserted into the outer pipe 10 and moves back and forth along the longitudinal direction of the outer pipe 10 in response to an opening or closing operation of the operating handle 7 by an operator such as a surgeon. A second pin Pi2 ( FIG. 2 ) having a cylindrical shape extending in a direction perpendicular to the plane of FIG. 1 and engaging with the jaw 11 is fixed to the end of the distal end side Ar1 of the inner pipe PI. In this embodiment, the second pin Pi2 is arranged on the upper side (the side where the jaw body 111 is arranged with respect to the treatment portion 131) of the first pin Pi1 in FIG. 2 .

[0023] The jaw 11 is connected to the outer pipe 10 by a first pin Pi1. The jaw 11 is also connected to the inner pipe PI by a second pin Pi2. The jaw 11 rotates about the first pin Pi1 relative to the outer pipe 10 in conjunction with the forward and backward movement of the inner pipe PI in response to an opening and closing operation of the operating handle 7 by an operator such as a surgeon. This causes the jaw 11 to open and close relative to a treatment portion 131, which is the distal end of the ultrasonic blade 13, and enables the jaw 11 to grasp a treatment target between the treatment portion 131 and the jaw 11.

[0024] The treatment tool 2 may be configured as a push-close type or a pull-close type.

[0025] The push-close type has the following configuration: The jaw 11 rotates around the first pin Pi1 in a direction approaching the treatment portion 131 in conjunction with the movement of the inner pipe PI toward the distal end side Ar1. That is, the jaw 11 closes relative to the treatment portion 131. Furthermore, the jaw 11 rotates around the first pin Pi1 in a direction away from the treatment portion 131 in conjunction with the movement of the inner pipe PI toward the proximal end side Ar2. That is, the jaw 11 opens relative to the treatment portion 131.

[0026] The pull-close type has the following configuration: The jaw 11 rotates around the first pin Pi1 in a direction approaching the treatment portion 131 in conjunction with the movement of the inner pipe PI toward the base end side Ar2. That is, the jaw 11 closes relative to the treatment portion 131. Also, the jaw 11 rotates around the first pin Pi1 in a direction away from the treatment portion 131 in conjunction with the movement of the inner pipe PI toward the tip end side Ar1. That is, the jaw 11 opens relative to the treatment portion 131.

[0027] The detailed configuration of the jaw 11 will be described later in the section "Configuration of the jaw."

[0028] The holder member 14 has a cylindrical shape extending in a direction perpendicular to the plane of FIG. 1 and is pivotally supported on the jaw 11 by a third pin Pi3 ( FIG. 2 ) fixed to the jaw 11 so as to be swingable about the central axis of the third pin Pi3. By allowing the holder member 14 to swing about the central axis of the third pin Pi3, when a treatment target is grasped between the jaw 11 and the treatment portion 131, the position at which the strongest force is applied to the treatment target is positioned approximately at the longitudinal center of the jaw 11, rather than at the base end side Ar2 of the jaw 11. In other words, a substantially uniform force is applied to the treatment target grasped between the jaw 11 and the treatment portion 131. In this embodiment, the third pin Pi3 is made of a conductive material such as metal.

[0029] The holder member 14 is also provided with an electrode EP and first and second conductive surfaces CS1 and CS2 (see FIG. 5).

[0030] The detailed configuration of the holder member 14 will be described later in the section "Configuration of the Holder Member." The configurations of the electrode EP and the first and second conductive surfaces CS1 and CS2 will be described later in the section "Configuration of the Electrodes and the First and Second Conductive Surfaces."

[0031] The abutment member 12 is made of a first resin material, such as polytetrafluoroethylene (PTFE), that is electrically insulating and biocompatible, and has a generally rectangular parallelepiped shape extending along the longitudinal direction of the jaw 11 and the holder member 14. As shown in Figures 2 and 3, the abutment member 12 is fixed to the surface of the holder member main body 141 that faces the treatment portion 131, and abuts against the treatment portion 131 when the jaw 11 is closed relative to the treatment portion 131. The abutment member 12 has the function of preventing the ultrasonically vibrating treatment portion 131 from colliding with the jaw 11 and being damaged when the incision of the treatment target by ultrasonic vibration is completed.

[0032] The ultrasonic blade 13 is made of a conductive material and has an elongated shape extending along the central axis Ax1. The ultrasonic blade 13 is inserted into the inner pipe PI with the treatment portion 131 protruding to the outside. At this time, the end of the proximal side Ar2 of the ultrasonic blade 13 is mechanically connected to the ultrasonic vibrator 52 constituting the ultrasonic transducer 5, as shown in FIG. 1 . The ultrasonic blade 13 transmits ultrasonic vibrations generated by the ultrasonic transducer 5 from the end of the proximal side Ar2 to the treatment portion 131. The ultrasonic vibrations are longitudinal vibrations that vibrate in a direction along the central axis Ax1. The outer peripheral surface of the ultrasonic blade 13, excluding the treatment portion 131, is covered by an electrically insulating inner tube.

[0033] As shown in FIG. 1 , the ultrasonic transducer 5 includes a TD (transducer) case 51 and an ultrasonic vibrator 52 .

[0034] The TD case 51 supports the ultrasonic transducer 52 and is detachably connected to the fixed handle 6 .

[0035] The ultrasonic vibrator 52 generates ultrasonic vibrations under the control of the control device 3. In this embodiment, the ultrasonic vibrator 52 is configured by a BLT (bolt-tightened Langevin type vibrator).

[0036] [Configuration of the control device] The control device 3 comprehensively controls the operation of the treatment tool 2 via the electric cable C (Fig. 1). Specifically, the control device 3 detects a treatment operation on the switch 8 by an operator such as a surgeon via the electric cable C. When the control device 3 detects the treatment operation, it applies treatment energy to the treatment target grasped between the jaw 11 and the treatment portion 131 via the electric cable C. In other words, the control device 3 treats the treatment target.

[0037] For example, when applying ultrasonic energy to a treatment target, the control device 3 supplies driving power to the ultrasonic vibrator 52 via the electric cable C. This causes the ultrasonic vibrator 52 to generate longitudinal vibrations (ultrasonic vibrations) that vibrate in a direction along the central axis Ax1. The treatment unit 131 also vibrates at a desired amplitude due to the longitudinal vibrations. Then, ultrasonic vibrations are supplied from the treatment unit 131 to the treatment target grasped between the jaw 11 and the treatment unit 131. Ultrasonic energy is applied from the treatment unit 131 to the treatment target.

[0038] Furthermore, for example, when applying high-frequency energy to a treatment target, the control device 3 supplies high-frequency power between the electrode EP provided on the holder member 14 and the ultrasonic blade 13 via an electric cable C or the like. When high-frequency power is supplied between the electrode EP and the ultrasonic blade 13, a high-frequency current is supplied to the treatment target grasped between the jaw 11 and the treatment section 131. In other words, high-frequency energy is applied to the treatment target.

[0039] [Regarding the jaw configuration] Fig. 4 is a diagram illustrating the configuration of the jaw 11. Specifically, Fig. 4 is a perspective view of the jaw 11 as seen from the treatment portion 131 side. For ease of explanation, the distal end portion is not shown in Fig. 4. The jaw 11 is made of a conductive material. As shown in Fig. 4, the jaw 11 is a member in which a jaw main body 111 and a pair of bearing portions 112 are integrally formed.

[0040] The jaw body 111 is configured as a long, approximately plate-like body. As shown in FIG. 4 , a recess 1111 is provided on the surface of the jaw body 111 facing the treatment section 131, extending from the base end toward the distal end Ar1 along the longitudinal direction of the jaw body 111.

[0041] 4, a through-hole 1113 is provided in each of the widthwise sidewall portions of the jaw body 111, which constitutes the recess 1111, at a position substantially in the center of the longitudinal direction of the jaw 11. A third pin Pi3 is inserted into the through-hole 1113 and fixed thereto by welding.

[0042] A cover RC (FIGS. 2 to 4) made of an electrically insulating resin is integrally formed on the rear surface of the jaw body 111, which is away from the treatment portion 131, so as to cover the rear surface. In this embodiment, the cover RC is insert-molded into the jaw body 111, but this is not limiting. For example, a configuration may be adopted in which the cover RC is fixed to the jaw body 111 by a snap fit or a metal pin.

[0043] The pair of bearing portions 112 are respectively provided at the end of the base end side Ar2 of the jaw body 111, and are each composed of a plate body that faces the jaw body 111 in the width direction. The pair of bearing portions 112 have the same configuration. Therefore, the following will describe the configuration of only one bearing portion 112.

[0044] The bearing portion 112 is provided with first and second insertion holes 1121 and 1122 that penetrate the front and back, respectively. The bearing portion 112 is connected to the outer pipe 10 by inserting a first pin Pi1 into the first insertion hole 1121. The bearing portion 112 is connected to the inner pipe PI by inserting a second pin Pi2 into the second insertion hole 1122.

[0045] [Configuration of Holder Member 14] Figure 5 is a diagram illustrating the configuration of the holder member 14. Specifically, Figure 5 is a perspective view of the holder member 14 as viewed from the treatment section 131 side. For ease of explanation, dots are applied to the electrode EP and the first and second conductive surfaces CS1, CS2 in Figure 5. The holder member 14 is made of a second resin material that is electrically insulating and biocompatible, such as polyether ether ketone (PEEK) or polyphenylsulfone (PPSU). As shown in Figure 5, the holder member 14 is a member in which a holder member main body 141, a plurality of first teeth 142, and a plurality of second teeth 143 are integrally formed.

[0046] The holder member main body 141 is formed of a long plate. The outer shape of the holder member main body 141 is set to be substantially the same as the inner shape of the recess 1111.

[0047] As shown in Figure 5, the multiple first tooth portions 142 each protrude from one side of the width direction on the surface of the holder member main body 141 facing the treatment portion 131 toward the treatment portion 131, and are arranged side by side along the longitudinal direction of the holder member main body 141.

[0048] As shown in Figure 5, the multiple second tooth portions 143 each protrude from the other side of the width direction on the treatment portion 131 side surface of the holder member main body 141, toward the treatment portion 131 side, and are arranged side by side along the longitudinal direction of the holder member main body 141.

[0049] Here, as shown in FIG. 5 , a recess 144 is provided in the widthwise central portion of the surface of the holder member main body 141 facing the treatment unit 131, the recess 144 being recessed on the side away from the treatment unit 131 and extending along the longitudinal direction of the holder member main body 141. Furthermore, claw portions 145, 146 ( FIGS. 3 and 5 ) that protrude toward the widthwise center and extend along the longitudinal direction of the holder member main body 141 are provided on the sidewall portions on both sides of the widthwise direction of the holder member main body 141 that form the recess 144. The abutting member 12 is mechanically fixed to the holder member 14 by being engaged with the claw portions 145, 146. That is, the abutting member 12 is provided in the widthwise central portion of the holder member 14. Furthermore, the side wall portions on both sides in the width direction of the holder member main body 141 that form the recess 144 are provided with insertion holes 147 that penetrate the side wall portions from the front to the back and through which the third pin Pi3 is inserted.

[0050] [Configuration of the Electrode and First and Second Conductive Surfaces] As shown in Fig. 5, the electrodes EP are provided on the widthwise inner surfaces (on the second tooth portions 143 side) of the plurality of first tooth portions 142, the tip surfaces of the first tooth portions 142, the widthwise inner surfaces (on the first tooth portion 142 side) of the plurality of second tooth portions 143, and the tip surfaces of the second tooth portions 143. In addition, a coating material that is non-adhesive to the treatment target is applied to the electrodes EP. The coating material is an extremely thin coating material having a thickness of approximately several hundred nanometers to several micrometers and containing fluorine or silicon.

[0051] As shown in FIG. 5, the first conductive surface CS1 is provided on the inner surface of the insertion hole 147.

[0052] As shown in FIG. 5, the second conductive surface CS2 is provided on the side wall of the recess 144, and electrically connects the electrode EP and the first conductive surface CS1.

[0053] The electrode EP and the first and second conductive surfaces CS1 and CS2 described above are formed by the following three-dimensional plating process. Specifically, a laser is irradiated at predetermined positions on the holder member 14 made of the second resin material. Then, electroless plating is used to form the electrode EP and the first and second conductive surfaces CS1 and CS2 at the laser irradiation positions. The thickness of the electrode EP and the first and second conductive surfaces CS1 and CS2 is, for example, approximately several micrometers. A structure produced by such a three-dimensional plating process is called a molded interconnect device (MID), as it is a three-dimensional resin molded product with an electrode circuit formed on its surface. The electrode EP and the first and second conductive surfaces CS1 and CS2 are not limited to those formed by the above-described three-dimensional plating process, and may also be formed by other methods.

[0054] When high-frequency power is supplied to the electrode EP to apply high-frequency energy to the treatment target, the high-frequency power is supplied along the electrical path from the electrical cable C to the outer pipe 10 to the first pin Pi1 to the jaw 11 to the third pin Pi3 to the first conductive surface CS1 to the second conductive surface CS2 to the electrode EP.

[0055] The present embodiment described above provides the following advantages. In the treatment tool 2 according to this embodiment, at least a portion of the holder member 14 is made of the second resin material. The holder member 14 is provided with the above-described electrode EP. Therefore, the rigidity of the holder member 14 can be reduced compared to when the holder member 14 is made of a metal material. That is, even if the contact member 12 wears due to repeated output of ultrasonic vibrations, the distance between the ultrasonic blade 13 and the holder member 14 decreases, and the ultrasonic blade 13 and the holder member 14 come into contact with each other, the impact on the ultrasonic blade 13 can be reduced. Therefore, the treatment tool 2 according to this embodiment can reduce the impact on the lifespan of the ultrasonic blade 13.

[0056] In particular, the electrodes EP are formed by a three-dimensional plating process, so that even if the holder member 14 is made of the second resin material, the electrodes EP can be easily formed at specific positions on the holder member 14.

[0057] In addition, the electrode EP is provided with a coating material that is non-adhesive to the treatment target, which prevents the treatment target from sticking to the electrode EP and allows the treatment target to be treated well.

[0058] Other Embodiments While the embodiments for carrying out the present invention have been described above, the present invention should not be limited to the above-described embodiments. In the above-described embodiments, the outer pipe 10 is used as the electrical path from the electric cable C to the electrode EP, but the present invention is not limited to this, and an inner pipe PI may be used instead of the outer pipe 10.

[0059] FIG. 6 is a diagram illustrating a modified example of the embodiment. Specifically, FIG. 6 corresponds to FIG. 4. For ease of explanation, dots are added to the third conductive surface CS3 in FIG. 6. In the above-described embodiment, the jaw 11 is made of a conductive material. However, this is not a limitation and the jaw 11 may be made of a third resin material. The third resin material may be the same as the second resin material described in the above-described embodiment. In this case, as shown in FIG. 6, the jaw 11 is provided with a third conductive surface CS3 to ensure an electrical path from the first pin Pi1 to the third pin Pi3.

[0060] The third conductive surface CS3 is provided on the inner surface of the first insertion hole 1121, the inner surface of the through hole 1113, the surface of the bearing portion 112 facing the other bearing portion 112, and the side wall portion of the recess 1111, and ensures an electrical path from the first pin Pi1 inserted into the first insertion hole 1121 to the third pin Pi3 inserted into the through hole 1113.

[0061] The third conductive surface CS3 described above is formed by a three-dimensional plating process, similar to the electrode EP and the first and second conductive surfaces CS1 and CS2 described in the above-described embodiment. Note that the third conductive surface CS3 is not limited to one formed by the above-described three-dimensional plating process, and one formed by other methods may also be used.

[0062] Even when the configuration of this modified example shown in FIG. 6 is adopted, the same effects as those of the above-described embodiment are achieved.

[0063] REFERENCE SIGNS LIST 1 Treatment system 2 Treatment tool 3 Control device 4 Handpiece 5 Ultrasonic transducer 6 Fixed handle 7 Operating handle 8 Switch 9 Rotating knob 10 Outer pipe 11 Jaw 12 Abutment member 13 Ultrasonic blade 14 Holder member 51 TD case 52 Ultrasonic vibrator 111 Jaw body 112 Bearing portion 131 Treatment portion 141 Holder member body 142 First tooth portion 143 Second tooth portion 144 Recessed portion 145, 146 Claw portion 147 Insertion hole 1111 Recessed portion 1113 Through hole 1121 First insertion hole 1122 Second insertion hole Ar1 Distal end side Ar2 Base end side Ax1 Central axis C Electrical cable CS1 First conductive surface CS2 Second conductive surface CS3 Third conductive surface EP Electrode Pi1 First pin Pi2 Second pin Pi3 Third pin PI Inner pipe RC Cover

Claims

1. An ultrasonic treatment device comprising: an ultrasonic blade that supplies ultrasonic vibrations and high-frequency current to biological tissue, respectively; a jaw that opens and closes relative to the ultrasonic blade; a holder member that is swingably attached to the jaw; and a contact member that is attached to the holder member and made of a first resin material and that contacts the ultrasonic blade when the jaw is closed relative to the ultrasonic blade, wherein at least a portion of the holder member is made of a second resin material and has an electrode that supplies the high-frequency current to at least a portion of the contact surface that contacts the biological tissue.

2. An ultrasonic treatment device as described in claim 1, wherein the abutment member is provided in the central portion of the holder member in the width direction, and the electrodes are provided on at least a portion of the contact surface located on both sides of the abutment member in the width direction.

3. The ultrasonic treatment device according to claim 1, wherein the second resin material is polyether ether ketone or polyphenylsulfone.

4. The ultrasonic treatment device according to claim 1, wherein the electrodes are formed by a three-dimensional plating process.

5. An ultrasonic treatment device according to claim 1, further comprising a cylindrical pin attached to the jaw and supporting the holder member so that the holder member can swing, and the electrode is electrically connected to the jaw via the pin.

6. An ultrasonic treatment device as described in claim 5, wherein the holder member is provided with an insertion hole through which the pin is inserted, and the inner surface of the insertion hole is provided with a first conductive surface that electrically connects the pin and the electrode.

7. An ultrasonic treatment device according to claim 6, wherein the holder member is provided with a second conductive surface that electrically connects the first conductive surface and the electrode.

8. An ultrasonic treatment device according to claim 1, wherein the electrodes are provided with a coating material that is non-adhesive to the biological tissue.

9. An ultrasonic treatment instrument according to claim 6, wherein the jaw is made of a third resin material and has a third conductive surface electrically connected to the pin.

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