Ultrasonic treatment tool

Abstract

An ultrasonic treatment tool according to the present invention comprises: a vibration transmission member which has a treatment part at the tip end thereof for treating a treatment target and which transmits ultrasonic vibration from the base end toward the treatment part; a holding member which opens and closes with respect to the treatment part; and a resin pad which is held by the holding member and which has a gripping surface that grips the treatment target between the resin pad and the treatment part. The resin pad has: a first region which includes a gripping position for the treatment target and in which heat generated by the treatment is large; and a second region other than the first region. In the holding member, the heat capacity per unit length of a third region facing the first region is greater than the heat capacity per unit length of a fourth region facing the second region.

Description

Ultrasonic Treatment Device

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

[0002] BACKGROUND ART Conventionally, ultrasonic treatment devices are known that apply ultrasonic energy to a target area in living tissue to treat the target area (hereinafter referred to as the target area) (see, for example, Patent Document 1).

[0003] The ultrasonic treatment device described in Patent Document 1 includes a rod member, a holder member, and a pad member (hereinafter referred to as a resin pad) as shown below. The rod member has a treatment portion at its tip for treating biological tissue, and transmits ultrasonic vibrations from its base end toward the treatment portion. The holder member opens and closes relative to the treatment portion. The resin pad is held by the holder member and has an abutment surface that grips the biological tissue between the holder member and the treatment portion.

[0004] However, there is a problem with resin pads in that, for example, when ultrasonic vibrations are applied from the treatment unit after treatment (incision) of the target site is completed, the resin pad may deteriorate due to frictional heat and may no longer be able to perform the desired function. In response to this, the ultrasonic treatment device described in Patent Document 1 is equipped with a heat transfer member that transfers the heat of the resin pad to the holder member, thereby reducing the frictional heat of the resin pad.

[0005] International Publication No. 2022 / 185406

[0006] However, there is a problem in that the provision of the heat transfer member increases the size of the ultrasonic treatment instrument.

[0007] The present invention has been made in view of the above, and an object of the present invention is to provide an ultrasonic treatment device that can suppress deterioration of a resin pad while suppressing an increase in size.

[0008] In order to solve the above-mentioned problems and achieve the object, the ultrasonic treatment instrument of the present invention has a treatment section at its tip for treating a treatment target, and is equipped with a vibration transmission member that transmits ultrasonic vibrations from the base end toward the treatment section, a holding member that opens and closes with respect to the treatment section, and a resin pad that is held by the holding member and has a gripping surface that grips the treatment target between the treatment section and the holding member, wherein the resin pad includes a gripping position of the treatment target and has a first region where large heat is generated by treatment and a second region other than the first region, and the heat capacity per unit length of the holding member in a third region opposite the first region is larger than the heat capacity per unit length of a fourth region opposite the second region.

[0009] According to the ultrasonic treatment device of the present invention, it is possible to suppress deterioration of the resin pad while suppressing an increase in size.

[0010] FIG. 1 is a diagram showing an ultrasonic treatment device according to an embodiment. FIG. 2 is a diagram showing a tip portion of the ultrasonic treatment device. FIG. 3 is a diagram showing a tip portion of the ultrasonic treatment device. FIG. 4 is a diagram showing a jaw. FIG. 5 is a diagram showing a jaw. FIG. 6 is a diagram showing an arm. FIG. 7 is a diagram showing a wiper jaw. FIG. 8 is a diagram showing a wiper jaw. FIG. 9 is a diagram for explaining an example of heat received by a resin pad in the longitudinal direction. FIG. 10 is a partial cross-sectional view showing the tip portion of the jaw. FIG. 11 is a cross-sectional view of the jaw tip portion corresponding to line A-A shown in FIG. 10. FIG. 12 is a cross-sectional view of the jaw tip portion corresponding to line B-B shown in FIG. 10. FIG. 13 is a diagram showing an example of the configuration of a conventional jaw tip portion.

[0011] 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.

[0012] (Embodiment) FIG. 1 is a diagram illustrating an ultrasonic treatment device 1 according to an embodiment. FIGS. 2 and 3 are diagrams illustrating the distal end portion of the ultrasonic treatment device 1. Specifically, FIG. 2 is a diagram illustrating the distal end portion of the ultrasonic treatment device 1, viewed along a normal direction of a plane including the central axis Ax of a sheath 7, with the jaw 8 and the vibration transmission member 10 included in the plane. FIG. 2 is a cross-sectional view of the distal end portion of the ultrasonic treatment device 1, cut along the plane including the central axis Ax of the sheath 7, with the jaw 8 and the vibration transmission member 10 included in the plane. Note that the "width direction" described below refers to a direction perpendicular to the paper surface of FIGS. 2 and 3. The ultrasonic treatment device 1 applies ultrasonic energy and / or high-frequency energy to a target portion of biological tissue to treat the target portion. Here, the treatment refers to, for example, coagulation and incision of the target portion. As shown in FIG. 1, the ultrasonic treatment device 1 includes a handpiece 2 and an ultrasonic transducer 3.

[0013] 1 to 3, the handpiece 2 includes a holding case 4 (see FIG. 1), an operating handle 5 (see FIG. 1), a switch 6 (see FIG. 1), a sheath 7, a jaw 8, a resin pad 9 (see FIGS. 2 and 3), and a vibration transmission member 10. The holding case 4 supports the entire ultrasonic treatment instrument 1. The operating handle 5 is movably attached to the holding case 4 and is opened and closed by the operator.

[0014] The switch 6 is exposed to the outside of the holding case 4 and receives an output start operation from the operator. The switch 6 outputs an operation signal corresponding to the output start operation to a control device (not shown) electrically connected to the ultrasonic treatment instrument 1. The sheath 7 has a generally cylindrical shape. Hereinafter, one side of the sheath 7 along the central axis Ax will be referred to as the distal end side Ar1 (see FIGS. 1 to 3 ), and the other side will be referred to as the proximal end side Ar2 (see FIGS. 1 to 3 ). The sheath 7 is attached to the holding case 4 by inserting a portion of the proximal end side Ar2 into the holding case 4 from the distal end side Ar1 of the holding case 4. The outer peripheral surface of the sheath 7 is covered with an electrically insulating outer tube TO. The inner peripheral surface of the sheath 7 is covered with an electrically insulating inner tube.

[0015] In the following description of the configuration of the jaw 8 and the resin pad 9, the side of the vibration transmission member 10 away from the treatment portion 101 will be referred to as the rear side Ar3 (see FIGS. 4 to 9 ), and the side close to the treatment portion 101 will be referred to as the treatment portion side Ar4 (see FIGS. 4 to 9 ). FIGS. 4 and 5 are views of the jaw 8. Specifically, FIG. 4 is a perspective view of the jaw 8 as seen from the rear side Ar3. FIG. 5 is a perspective view of the jaw 8 as seen from the treatment portion side Ar4. FIG. 5 shows a state in which the resin pad 9 is assembled to the jaw 8. The jaw 8 corresponds to a holding member according to the present invention. The jaw 8 is pivotally supported on the end of the distal end side Ar1 of the sheath 7, thereby enabling it to open and close relative to the treatment portion 101 (see FIGS. 2 and 3 ). When the jaw 8 closes relative to the treatment portion 101, the target area is grasped between the resin pad 9 held by the jaw 8 and the treatment portion 101. As shown in FIG. 4 or 5, the jaw 8 includes an arm 81 and a wiper jaw 82 .

[0016] FIG. 6 is a diagram showing the arm 81. Specifically, FIG. 6 is a perspective view of the arm 81 as viewed from the treatment unit side Ar4. The arm 81 is made of a conductive material. As shown in FIG. 6, the arm 81 is a member in which an arm body 811 and a pair of bearings 812 are integrally formed. The arm body 811 is made of a long, approximately plate-like body. In this embodiment, the longitudinal direction of the arm body 811 is a direction along a curve that extends leftward as it approaches the tip side Ar1 when viewed from the base end side Ar2 with the jaw 8 positioned above the treatment unit 101.

[0017] As shown in FIG. 6 , the arm main body 811 has a first recess 811a on the treatment unit side Ar4, extending from the base end toward the tip end side Ar1 along the longitudinal direction of the arm main body 811. As shown in FIG. 6 , sidewall portions 811b on both widthwise sides of the arm main body 811 that constitute the first recess 811a are provided with first insertion holes 811c that penetrate the arm main body 811 in the width direction and through which first pins Pi1 (see FIGS. 4 and 5 ) are inserted. The two first insertion holes 811c are located approximately in the longitudinal center of the arm main body 811. A straight line connecting the two first insertion holes 811c is parallel to the width direction. In this embodiment, the first pins Pi1 are fixed to the arm main body 811 by welding while inserted into the respective first insertion holes 811c.

[0018] An electrically insulating resin cover RC (see FIGS. 4 to 6) is integrally formed on the rear surface Ar3 of the arm main body 811 so as to cover the rear surface Ar3. In this embodiment, the resin cover RC is insert-molded into the arm main body 811, but this is not limiting. For example, a configuration may be adopted in which the resin cover RC is fixed to the arm main body 811 by snap fitting or a metal pin.

[0019] The pair of bearings 812 are provided at the base end of the arm body 811 and are each composed of a plate member facing each other in the width direction. As shown in FIG. 6 , each of the pair of bearings 812 has a second insertion hole 812a penetrating the front and back of the arm body 811, through which two second pins Pi2 are inserted. That is, the arm 81 is connected to the sheath 7 via the two second pins Pi2. As shown in FIG. 4 , each of the pair of bearings 812 has a third insertion hole 812b penetrating the front and back of the arm body 811, through which a third pin Pi3 is inserted. In this embodiment, the third pins Pi3 are fixed to the arm 81 by welding while being inserted through the fourth insertion holes 711 (see FIG. 3 ) and the third insertion holes 812b of the opening / closing mechanism 71 constituting the sheath 7. That is, the arm 81 is connected to the opening / closing mechanism 71 via the third pins Pi3. The arm 81 rotates about the two second pins Pi2 in conjunction with the movement of the opening / closing mechanism 71 toward the distal end side Ar1 or the proximal end side Ar2 in response to the opening / closing operation of the operating handle 5 by the surgeon. This causes the jaw 8 to open and close relative to the treatment unit 101.

[0020] 7 and 8 are views showing the wiper jaw 82. Specifically, Fig. 7 is a perspective view of the wiper jaw 82 as seen from the rear side Ar3. Fig. 8 is a view of the wiper jaw 82 as seen along the width direction. Note that Figs. 7 and 8 show a state in which the resin pad 9 is assembled to the wiper jaw 82.

[0021] The wiper jaw 82 is made of a conductive material such as stainless steel or a titanium alloy, and is attached to the arm 81. As shown in Fig. 7 or 8, the wiper jaw 82 includes a wiper jaw body 83, a plurality of first teeth 84 (see Fig. 3), and a plurality of second teeth 85.

[0022] The wiper jaw body 83 is configured as a long plate extending along the longitudinal direction of the arm body 811. The outer shape of the wiper jaw body 83 is set to be substantially the same as the inner shape of the first recess 811a. The wiper jaw body 83 is disposed within the first recess 811a.

[0023] The wiper jaw body 83 has a second recess 831 formed on the treatment section side Ar4, which penetrates the wiper jaw body 83 from its base end to its tip end along the longitudinal direction of the wiper jaw body 83 and in which the resin pad 9 is disposed. Hereinafter, the bottom surface of the second recess 831 will be referred to as the bottom surface 831a, and the sidewall portions on both sides of the second recess 831 in the width direction will be referred to as sidewall portions 831b. As shown in FIGS. 7 and 8 , the wiper jaw body 83 also has a fifth insertion hole 831c formed therein, which penetrates the wiper jaw body 83 in the width direction from one sidewall portion 831b to the other sidewall portion 831b and through which the first pin Pi1 is inserted. The fifth insertion hole 831c is located approximately in the longitudinal center of the wiper jaw body 83. The central axis of the fifth insertion hole 831c is parallel to the width direction. The wiper jaw body 83 is pivotally supported on the arm 81 so as to be swingable around the first pin Pi1. That is, by allowing the wiper jaw 82 to swing around the first pin Pi1, when a target site is grasped between the jaw 8 and the treatment unit 101, the position at which the strongest force is applied to the target site is positioned at approximately the center in the longitudinal direction of the jaw 8, rather than at the base end side Ar2 of the jaw 8. This allows a substantially uniform force to be applied to the target site grasped between the jaw 8 and the treatment unit 101.

[0024] The plurality of first tooth portions 84 each protrude from one side wall portion 831b toward the treatment unit side Ar4 and are arranged side by side along the longitudinal direction of the wiper jaw body 83. The plurality of second tooth portions 85 each protrude from the other side wall portion 831b toward the treatment unit side Ar4 and are arranged side by side along the longitudinal direction of the wiper jaw body 83. The plurality of first tooth portions 84 and the plurality of second tooth portions 85 are arranged with the resin pad 9 sandwiched between them when the resin pad 9 is attached to the wiper jaw 82.

[0025] The resin pad 9 is softer than the vibration transmission member 10 and is made of an electrically insulating and biocompatible resin material, such as polytetrafluoroethylene (PTFE), and has a generally rectangular parallelepiped shape extending along the longitudinal direction of the arm body 811. The surface of the resin pad 9 on the treatment portion side Ar4 is provided with a third recess 91 (see FIG. 10 ) extending from the base end toward the distal end side Ar1. The resin pad 9 is disposed inside the second recess 831. When the jaw 8 is brought close to the treatment portion 101, a bottom surface 911 of the third recess 91 of the resin pad 9 abuts against the treatment portion 101. The bottom surface 911 has a generally flat shape. The bottom surface 911 corresponds to a gripping surface according to the present invention. Hereinafter, for convenience of explanation, the bottom surface 911 will be referred to as the gripping surface 911.

[0026] The vibration transmission member 10 has an elongated shape and is made of a conductive material. As shown in Fig. 2 or 3, the vibration transmission member 10 is inserted into the sheath 7 with the treatment portion 101 exposed to the outside. The vibration transmission member 10 includes the treatment portion 101 and a shaft 102. The treatment portion 101 is provided at the tip of the shaft 102. Like the jaw 8, the treatment portion 101 extends along a curve that curves leftward toward the tip side Ar1 when viewed from the base end side Ar2 with the jaw 8 positioned on the upper side.

[0027] The shaft 102 has an elongated shape extending along the central axis Ax, and an end portion on the base end side Ar2 is connected to a BLT (bolt-clamped Langevin type vibrator) constituting the ultrasonic transducer 3. The shaft 102 transmits ultrasonic vibrations generated by the BLT from the end portion on the base end side Ar2 to the treatment portion 101. In this embodiment, the ultrasonic vibrations are longitudinal vibrations vibrating in a direction along the central axis Ax. At this time, the treatment portion 101 vibrates at a desired amplitude due to the longitudinal vibration of the vibration transmission member 10.

[0028] Annular linings having electrical insulation and elasticity are attached to the outer peripheral surface of the shaft 102 described above, and extend in the circumferential direction around the central axis of the shaft 102. The linings are respectively arranged at the positions of the nodes of the longitudinal vibration of the vibration transmission member 10. The linings come into contact with the inner tube when the vibration transmission member 10 is inserted inside the sheath 7. The inner tube has the function of ensuring electrical insulation between the sheath 7 and the vibration transmission member 10. The lining also has the function of sealing against liquid that seeps into the gap between the inner tube and the vibration transmission member 10.

[0029] The ultrasonic transducer 3 is detachably connected to the end of the base end side Ar2 of the holding case 4. Although not specifically shown in the drawings, the ultrasonic transducer 3 includes a BLT that generates ultrasonic vibrations in response to the supply of AC power.

[0030] A control device (not shown) electrically connected to the ultrasonic treatment instrument 1 described above controls the operation of the ultrasonic treatment instrument 1 in accordance with an operation signal from the switch 6, as follows. The control device supplies high-frequency power between the jaw 8 and the treatment unit 101 via the sheath 7 and the shaft 102. A high-frequency current flows between the treatment unit 101 and the plurality of teeth (the first teeth 84 and the second teeth 85) that are at the same potential. That is, a high-frequency current flows through a target area grasped between the jaw 8 and the treatment unit 101. In other words, high-frequency energy is applied to the target area. The control device also supplies AC power to the BLT constituting the ultrasonic transducer 3, causing the BLT to generate ultrasonic vibrations. Then, ultrasonic vibrations are applied from the treatment unit 101 to the target area grasped between the jaw 8 and the treatment unit 101. In other words, ultrasonic energy is applied to the target area. Joule heat is generated in the target area as a result of the high-frequency current flowing through the target area. Furthermore, frictional heat is generated between the treatment portion 101 and the target site due to the longitudinal vibration of the treatment portion 101. As a result, the target site is incised while being coagulated.

[0031] 9 is a diagram illustrating an example of heat received by the resin pad 9 in the longitudinal direction (direction of the central axis Ax). Here, an example is described in which a target area is grasped in a grasping region Tr1 (see FIG. 8 ) on the distal side Ar1 of the wiper jaw 82 relative to the first pin Pi1, and ultrasonic energy is applied to the target area. As shown in FIG. 9 , the heat (J) due to friction received by the resin pad 9 increases in the vicinity of and including the grasping region Tr1. In this case, in the longitudinal direction (direction of the central axis Ax) of the wiper jaw 82, the distal side Ar1 is defined as a high-temperature region R1 (first region), and the proximal side Ar2 is defined as a low-temperature region R2 (second region), with the rising position as the boundary where the heat received by the resin pad 9 rises.

[0032] Fig. 10 is a partial cross-sectional view showing the tip of the jaw. Fig. 11 is a cross-sectional view of the jaw tip corresponding to line A-A shown in Fig. 10. Fig. 12 is a cross-sectional view of the jaw tip corresponding to line B-B shown in Fig. 10. As shown in Fig. 10, the wiper jaw body 83 is composed of a main body portion 832 and an outer cover 833 formed on the outer surface of the main body portion 832. In this embodiment, the outer cover 833 is formed on the outer surface on the side where the arm 81 is attached, where the resin pad 9 is not provided. Furthermore, in this embodiment, the main body portion 832 is formed entirely using the same material.

[0033] In the wiper jaw body 83, a region (third region: see FIG. 11 ) facing the high-temperature region R1 of the resin pad 9 has a larger cross-sectional area (volume) of the main body 832 than a region (fourth region: see FIG. 12 ) facing the low-temperature region R2 of the resin pad 9. Here, for example, the "facing region" refers to a region of the wiper jaw body 83 that corresponds to the region of the resin pad 9 in the longitudinal direction (direction of the central axis Ax). As a result, the heat capacity per unit length of the region of the wiper jaw body 83 that corresponds to the high-temperature region R1 is larger than the heat capacity per unit length of the region of the wiper jaw body 83 that corresponds to the low-temperature region R2. Here, "unit length" refers to a predetermined length in the longitudinal direction (direction of the central axis Ax) of the wiper jaw body 83. By increasing the heat capacity per unit length of the region that corresponds to the high-temperature region R1, the wiper jaw body 83 is allowed to absorb more heat received by the resin pad 9 (see the arrow in FIG. 11 ).

[0034] 13 is a diagram showing an example of the configuration of a conventional jaw tip. A conventional wiper jaw body 200 is composed of a main body 201 and a cover 202 formed on the outer surface of the main body 201. In this case, the cover 202 is thicker than the outer skin 833, and the volume per unit length of the main body 201 varies only slightly in the longitudinal direction of the wiper jaw body 200 (corresponding to the direction of the central axis Ax). Therefore, in the conventional wiper jaw body 200, the difference in heat capacity between the high-temperature region and the low-temperature region corresponding to the heat received by the resin pad 9 is small.

[0035] The present embodiment described above provides the following advantages. The ultrasonic treatment instrument 1 according to this embodiment includes a gripping region Tr1 of the target area of ​​the resin pad 9. The heat capacity of the wiper jaw body 83 at a position corresponding to a high-temperature region R1 where heat is generated during treatment is greater than the heat capacity of a position corresponding to a low-temperature region R2 where the resin pad 9 receives less heat. Therefore, compared to a conventional main body 201 with a small difference in heat capacity in the longitudinal direction, frictional heat generated in the resin pad 9 (gripping surface 911) due to application of ultrasonic vibrations can be efficiently received (transferred) to the wiper jaw body 83. Therefore, the ultrasonic treatment instrument 1 according to this embodiment can suppress deterioration of the resin pad 9 while suppressing an increase in size.

[0036] In the embodiment, an example has been described in which the gripping region Tr1 is located on the distal end side of the resin pad 9 and the portion proximal to the distal end is the low-temperature region R2. However, this is not limiting. For example, when the resin pad 9 grips a target area proximal to the distal end, the distal end side becomes the low-temperature region, and the heat capacity (volume) is adjusted accordingly. In this case, the volume of the distal end of the wiper jaw body 83 is smaller than the volume proximal to the distal end. Also, the division of the regions is not limited to two regions, for example, when the gripping region Tr1 is located in the center of the resin pad 9 in the longitudinal direction and the longitudinal direction of the resin pad 9 becomes a low-temperature region, a high-temperature region, and a low-temperature region in that order from the distal end.

[0037] In the embodiment, an example has been described in which the volume of the main body 832 in the region corresponding to the high-temperature region R2 is increased to increase the heat capacity and thereby increase the amount of heat received by the wiper jaw main body 83. However, the specific heat may be partially changed without changing the volume of the wiper jaw main body 83 in the longitudinal direction (direction of the central axis Ax). Specifically, the main body 832 in the region corresponding to the high-temperature region R2 (third region) may be formed of a material with high thermal conductivity so that the specific heat of the third region is greater than the specific heat of the fourth region. Examples of materials with high thermal conductivity include polyether ether ketone (PEEK) and polyimide (PI). Such partial changes in material may actually be adopted for the purpose of increasing the thermal efficiency at the tip or base end of the wiper jaw main body 83.

[0038] In this embodiment, the outer cover 833 may be formed of a heat insulating material that blocks heat. By providing the outer cover 833 with a heat insulating effect, the heat transfer to the arm 81 of the heat received by the wiper jaw body 83 from the resin pad 9 can be suppressed. This makes it possible to suppress the thermal influence of the heat from the arm 81 on areas other than the target area. Note that the wiper jaw body 83 may be configured with only the main body portion 832, without the outer cover 833.

[0039] (Other Embodiments) In the above-described embodiment, a configuration in which both ultrasonic energy and high-frequency energy are applied to the target area is employed, but this is not limited thereto. For example, a configuration in which only ultrasonic energy is applied to the target area, or a configuration in which at least one of high-frequency energy and thermal energy is applied to the target area in addition to ultrasonic energy, may be employed. Here, applying thermal energy to the target area means transferring heat from a heater or the like to the target area. Note that in a configuration in which only ultrasonic energy is applied, the wiper jaw 82 does not need to be made of a conductive material.

[0040] In the above-described embodiment, the holding member according to the present invention is configured to include the arm 81 and the wiper jaw 82 attached to the arm 81 so as to be swingable relative to the arm 81. However, the present invention is not limited to this. The holding member according to the present invention may be configured to be openable and closable relative to the treatment unit 101, and the wiper jaw 82 may be fixed to the arm 81 and not swingable.

[0041] As described above, the ultrasonic treatment device according to the present invention is useful for suppressing deterioration of the resin pad while suppressing an increase in size.

[0042] REFERENCE SIGNS LIST 1 ultrasonic treatment tool 2 handpiece 3 ultrasonic transducer 4 holding case 5 operation handle 6 switch 7 sheath 8 jaw 9 resin pad 10 vibration transmission member 71 opening / closing mechanism 81 arm 82 wiper jaw 83 wiper jaw body 84 first tooth portion 85 second tooth portion 101 treatment portion 102 shaft 711 fourth insertion hole 811 arm body 811a first recessed portion 811b side wall portion 811c first insertion hole 812 bearing portion 812a second insertion hole 812b third insertion hole 831 second recessed portion 831a bottom surface 831b side wall portion 831c fifth insertion hole 832 body portion 833 outer cover 911 gripping surface Ar1 Tip side Ar2 Base side Ar3 Back side Ar4 Treatment site side Ax Central axis Pi1 First pin Pi2 Second pin Pi3 Third pin R1 Low temperature area R2 High temperature area RC Resin cover TO Outer tube

Claims

1. An ultrasonic treatment device comprising: a treatment section at its tip for treating a treatment target, and a vibration transmission member for transmitting ultrasonic vibrations from the base end toward the treatment section; a holding member that opens and closes relative to the treatment section; and a resin pad that is held by the holding member and has a gripping surface for gripping the treatment target between the holding member and the treatment section, wherein the resin pad includes a gripping position for the treatment target and has a first region where large heat is generated by treatment and a second region other than the first region, and the heat capacity per unit length of the holding member in a third region opposite the first region is larger than the heat capacity per unit length of a fourth region opposite the second region.

2. The ultrasonic treatment device according to claim 1, wherein the volume per unit length of the third region of the holding member is larger than the volume per unit length of the fourth region.

3. The ultrasonic treatment device according to claim 1, wherein the specific heat of the third region of the holding member is greater than the specific heat of the fourth region.

4. The ultrasonic treatment instrument according to claim 1, wherein the holding member has a jaw body that holds the resin pad, the jaw body having a main body portion to which the resin pad is attached, and an outer skin provided on an outer surface of the main body portion that is different from the outer surface to which the resin pad is attached, and the outer skin is formed using a heat insulating material.

5. The ultrasonic treatment device according to claim 4, wherein the volume per unit length of the main body is greater than the volume per unit length of the outer cover.

6. The ultrasonic treatment device according to claim 1, wherein the holding member is made of a conductive material, and high-frequency energy is supplied to the treatment target by supplying high-frequency power between the holding member and the treatment section.

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