Handle assembly and endoscopic treatment tool

Abstract

To provide an endoscopic treatment tool in which electric connection between a connector to which a high-frequency current is supplied, and a long member such as a wire connected to a high-frequency treatment device is reliably secured.SOLUTION: A handle assembly comprises: a handle body; a transmission member for transmitting a high-frequency current; a conductive connector extending in a direction intersecting with a longitudinal axis of the transmission member; and a conductive elastic body for biasing the transmission member in a direction in which the connector extends, and pressing the transmission member against the connector. When the elastic body is in contact with the transmission member while being compressed, and presses the transmission member against the connector, the transmission member can slide with respect to the connector.SELECTED DRAWING: Figure 15

Description

[Technical Field]

[0001] The present invention relates to an endoscopic treatment device. This application claims the benefit of U.S. Provisional Application No. 63 / 569,475, filed March 25, 2024, the entire text of which is incorporated herein by reference. [Background technology]

[0002] Conventionally, in endoscopic treatment, endoscopic treatment tools have been used that include a high-frequency treatment device that applies high-frequency current, such as a hemostatic forceps that cauterizes a bleeding treatment target to stop the bleeding, or a high-frequency knife. The high-frequency current is supplied to a long member, such as a wire, connected to the high-frequency treatment device via a power cable that is connected to a connector provided in the operation section of the endoscopic treatment tool (for example, Patent Document 1 and Patent Document 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-295905 [Patent Document 2] Japanese Patent Application Laid-Open No. 2009-034388 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in an endoscopic treatment tool equipped with a high-frequency treatment device, unless the electrical connection between the connector to which high-frequency current is supplied and a long member such as a wire connected to the high-frequency treatment device is reliably secured, the high-frequency treatment device will not be able to demonstrate good treatment capabilities.

[0005] In light of the above circumstances, an object of the present invention is to provide a handle assembly and an endoscopic treatment tool that reliably ensure electrical connection between a connector to which high-frequency current is supplied and an elongated member such as a wire connected to a high-frequency treatment device. [Means for solving the problem]

[0006] In order to solve the above problems, the present invention proposes the following means. A handle assembly according to a first aspect of the present invention comprises a handle body, a transmission member that transmits high-frequency current, a conductive connector that extends in a direction intersecting the longitudinal axis of the transmission member, and a conductive elastic body that urges the transmission member in the direction of extension of the connector and presses the transmission member against the connector, wherein the elastic body contacts the transmission member in a compressed state, and when the transmission member is pressed against the connector, the transmission member is slidable relative to the connector. [Effects of the Invention]

[0007] The endoscopic treatment tool according to the present invention reliably ensures electrical connection between the connector to which high-frequency current is supplied and an elongated member such as a wire connected to a high-frequency treatment device. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is an overall view of an endoscopic treatment system according to a first embodiment. [Figure 2] 2 is an overall view showing an endoscopic treatment tool of the endoscopic treatment system. FIG. [Figure 3] FIG. 2 is a cross-sectional view of an operation portion of the endoscopic treatment tool. [Figure 4] FIG. 4 is a cross-sectional view of a slider of the operation unit. [Figure 5] 10A and 10B are diagrams showing a coil spring of the operation unit. [Figure 6] FIG. [Figure 7] 10A and 10B are diagrams showing an elastic body that is a modified example of the coil spring. [Figure 8] FIG. 10 is a view showing another aspect of the coil spring. [Figure 9] FIG. 10 is a view showing another aspect of the coil spring. [Figure 10] FIG. 10 is a cross-sectional view of an operation portion of an endoscopic treatment tool according to a second embodiment. [Figure 11] 10A and 10B are diagrams showing a leaf spring which is a modified example of the coil spring of the operation unit. [Figure 12] FIG. [Figure 13] FIG. [Figure 14] FIG. 10 is a cross-sectional view of an operation portion of an endoscopic treatment tool according to a third embodiment. [Figure 15] FIG. 10 is a cross-sectional view of an operation portion of an endoscopic treatment tool according to a fourth embodiment. [Figure 16] FIG. [Figure 17] FIG. 10 is a diagram showing a current path from an electrical connector to a pipe. [Figure 18] 10A and 10B are diagrams illustrating a modified example of the operation unit. [Figure 19] FIG. 2 is a diagram showing a treatment section (end effector). DETAILED DESCRIPTION OF THE INVENTION

[0009] (First embodiment) An endoscopic treatment system 300 including an endoscopic treatment tool 100 according to a first embodiment of the present invention will be described with reference to Fig. 1 to Fig. 9. Fig. 1 is an overall view of the endoscopic treatment system 300.

[0010] [Endoscopic Treatment System 300] 1, the endoscopic treatment system 300 includes an endoscopic treatment tool 100 and an endoscope 200. The endoscopic treatment tool 100 is inserted into the endoscope 200 when in use.

[0011] [Endoscope 200] The endoscope 200 is a known flexible endoscope and comprises an insertion section 210 that is inserted into the body from the tip, an operating section 220 attached to the base end of the insertion section 210, and a universal cord 230 attached to the operating section 220.

[0012] The insertion section 210 is a thin, long member that can be inserted into a lumen. The insertion section 210 has a tip section 211, a bending section 214, and a flexible section 215. The tip section 211, the bending section 214, and the flexible section 215 are connected in this order from the tip side. A channel 216 for inserting the endoscopic treatment tool 100 is provided inside the insertion section 210. A tip opening 212 of the channel 216 and an imaging section 213 are provided in the tip section 211.

[0013] The imaging unit 213 includes an imaging element such as a CCD or CMOS, and is capable of capturing an image of the area to be treated. The bending portion 214 bends in accordance with the user's operation of the operating unit 220. The flexible portion 215 is a flexible tubular portion.

[0014] The operation unit 220 is connected to the flexible section 215. The operation unit 220 has a grip 221, an input section 222, and a forceps port 223. The grip 221 is a member that is supported by a user. The input section 222 receives an operation input for bending the bending section 214. The forceps port 223 is a proximal opening of the channel 216.

[0015] The universal cord 230 connects the endoscopic treatment tool 100 to an external device. An imaging cable, an optical fiber cable, or the like that outputs an imaging signal captured by the imaging unit 213 to the outside is inserted into the universal cord 230.

[0016] [Endoscopic treatment tool 100] FIG. 2 is an overall view showing the endoscopic treatment tool 100. As shown in FIG. The endoscopic treatment tool 100 (also referred to as the treatment tool 100) is a hemostatic forceps that cauterizes an affected area to stop bleeding. The treatment tool 100 includes a sheath 1, an elongated member 2 (see FIG. 3), a transmission member 2A (see FIG. 3), a support member 3, forceps (jaw) 4, and an operation unit 5. In the following description, in the longitudinal axis direction A of the treatment tool 100, the side that is inserted into the patient's body will be referred to as the "tip side (distal side) A1," and the side of the operation unit 5 will be referred to as the "base side (proximal side) A2."

[0017] The sheath 1 is flexible and has a long coil sheath 13 extending from a distal end 1a to a proximal end 1b. The sheath 1 has an outer diameter that allows it to be inserted into a channel 216 of the endoscope 200. The sheath 1 may be insulating, and for example, the coil sheath 13 may be covered with a heat-shrinkable tube made of resin. As shown in FIG. 1 , when the sheath 1 is inserted into the channel 216, the distal end 1a of the sheath 1 can protrude and retract from a distal end opening 212 of the channel 216. The proximal end 1b of the sheath 1 is connected to the operation unit 5.

[0018] FIG. 3 is a cross-sectional view of the operation unit 5. The elongated member 2 is inserted through the internal space of the coil sheath 13. The distal end of the elongated member 2 is connected to the forceps 4, and the proximal end of the elongated member 2 is connected to the operation unit 5. The elongated member 2 is conductive and transmits high-frequency current to the forceps 4. The elongated member 2 is preferably a metal wire 21. Note that the elongated member 2 is not limited to the wire 21, and may be any conductive member such as a metal coil tube.

[0019] The transmission member (shaft) 2A passes through the internal space 6s of the handle body 6. The transmission member 2A is preferably a pipe 22. However, the transmission member 2A is not limited to the pipe 22 as long as at least a portion of the transmission member 2A is a conductive member and has higher rigidity than the wire 21.

[0020] The distal end of wire 21 is connected to forceps 4 via support member 3. The proximal end of wire 21 is inserted into pipe (transmission member) 22 in handle body 6. Wire 21 and pipe 22 are fixed so as not to move relative to each other, for example, by chemical bonding such as adhesive or mechanical bonding such as crimping. Wire 21 is inserted through coil sheath 13, and the distal end of pipe 22 is inserted into proximal end 13a of coil sheath 13.

[0021] The support member 3 is provided at the distal end 1a of the sheath 1, and supports the forceps 4 so that the forceps 4 can be opened and closed. The support member 3 has a link mechanism 34 (see FIG. 19) that converts the advancing and retracting movement of the wire 21 into the opening and closing movement of the forceps 4.

[0022] The forceps (jaw) 4 is a member that grasps biological tissue. The forceps 4 is supported by a support member 3 so as to be able to open and close toward the distal end side A1. The forceps 4 is formed of a metal material such as stainless steel, and includes a first forceps piece 41 and a second forceps piece 42. The support member 3 and the forceps 4 constitute a "treatment section (end effector) 110" that treats the affected area. The forceps 4 is an example of a high-frequency treatment device.

[0023] 2, the operation section (handle, handle assembly) 5 is provided on the proximal end side A2 of the sheath 1. The operation section 5 includes a handle body 6, an electrical connector 7, a slider 8, and a coil spring 9. In this embodiment, the electrical connector 7 is attached to the handle body 6.

[0024] In the following description of the operating unit 5, the direction in which the electrical connector 7 is provided with respect to the handle body 6 will be referred to as the lower side B2 in the vertical direction B, and the side opposite the lower side B2 in the vertical direction B will be referred to as the "upper side B1." Additionally, the direction perpendicular to the longitudinal axis direction A and the vertical direction B will be referred to as the "width direction C" or "left-right direction C." When looking from the tip side A1 to the base side A2, the direction facing right will be referred to as the "right side C1" in the width direction C, and the direction facing left will be referred to as the "left side C2" in the width direction C.

[0025] As shown in Figure 3, the handle body 6 has an internal space 6s through which the wire 21 can be inserted. The wire 21 passes through the internal space of the sheath 1 and the internal space 6s of the handle body 6 and extends to the slider 8. The handle body 6 has a thumb ring 62, a connector support part 64, and a coil sheath support part 69.

[0026] The handle body 6 has a first handle body 60 and a second handle body 61. The second handle body 61 is connected to the base end of the first handle body 60. The first handle body 60 and the second handle body 61 are connected to be relatively rotatable about a rotation axis extending in the longitudinal axis direction A. The internal space 6s is a continuous space formed in the first handle body 60 and the second handle body 61. The internal space 6s has an internal space 6t formed in the first handle body 60 and an internal space 6u formed in the second handle body 61.

[0027] The thumb ring 62 is provided on the base end side A2 of the second handle body 61. The surgeon can support the second handle body 61 by inserting his or her thumb through the thumb ring 62.

[0028] 3, the connector support portion 64 is provided on the first handle body 60. The connector support portion 64 supports the electrical connector 7. The connector support portion 64 has a through hole 65 that passes through in the vertical direction B, a cylindrical plug socket 66 formed on the lower side B2 of the through hole 65, and a coil spring support portion 67.

[0029] As shown in Figure 3, the electrical connector 7 is supported by the connector support 64, is a conductive member extending in a direction intersecting the longitudinal axis of the pipe 22, and is formed in a substantially cylindrical shape. Note that "substantially cylindrical" includes not only a strict cylindrical shape but also a shape close to a cylindrical shape. In this embodiment, the electrical connector 7 extends in the up-down direction B.

[0030] The electrical connector 7 has an upper end portion 70, a connecting portion 71, an energizing plug 74, a reduced diameter portion 75, and a flange 76. The electrical connector 7 extends between the energizing plug (first end portion) 74 and an upper end portion (second end portion) 70 supported by the coil spring support portion 67. The connecting portion 71 and the reduced diameter portion 75 are located between the energizing plug 74 and the upper end portion 70. The upper end portion 70 is provided on an upper side B1 of the connecting portion 71. The direction in which the electrical connector 7 extends intersects with the direction in which the pipe 22 (wire 21) extends.

[0031] The connecting portion 71 is formed in a substantially cylindrical shape and is provided on the upper side B1 of the electrical connector 7. The connecting portion 71 is connected to the pipe 22 in the internal space 6t of the first handle body 60. An insertion passage 72 is formed in the connecting portion 71. That is, the base end of the electrical connector 7 is formed with the insertion passage 72 extending in the longitudinal axis direction of the first handle body 60.

[0032] The pipe 22 is inserted into the insertion passage 72. That is, the insertion passage 72 is a through-hole formed along the longitudinal axis direction A in which the pipe 22 extends, and the pipe 22 and the wire 21 passing through the pipe 22 are inserted therethrough so as to be able to advance and retreat. In the following description, the wire 21 and pipe 22 inserted through the insertion passage 72 are also referred to as the "base end connection portion 2b."

[0033] The energizing plug 74 is a plug provided on the lower side B2 of the electrical connector 7 (first end of the electrical connector 7), and is connected to a power cable (active cord).

[0034] The reduced diameter portion 75 is an intermediate portion in the up-down direction B, and is provided between the insertion passage 72 and the energized plug 74. The outer diameter of the reduced diameter portion 75 is smaller than the outer diameter of the connecting portion 71 and the outer diameter of the energized plug 74. The reduced diameter portion 75 is inserted into and fixed to the through-hole 65 of the first handle body 60. Specifically, a flange 76 is provided between the reduced diameter portion 75 and the connecting portion 71, and a portion of the connector support portion 64 is sandwiched between the flange 76 and the energized plug 74, thereby mechanically fixing the electrical connector 7 to the first handle body 60 (connector support portion 64). Note that the method of fixing the electrical connector 7 to the first handle body 60 is not limited to this, and they may be fixed by means of an adhesive or the like.

[0035] The connecting portion 71 and the energized plug 74, which are arranged on both sides of the reduced diameter portion 75 in the vertical direction B, cannot be inserted through the through-hole 65 of the first handle body 60. The connecting portion 71 and the energized plug 74 engage with the openings on both ends of the through-hole 65 in the vertical direction B, so that the movement range of the electrical connector 7 in the vertical direction B is restricted to a predetermined range.

[0036] The through hole 65 is a through hole through which the reduced diameter portion 75 of the electrical connector 7 is inserted. The length of the through hole 65 in the up-down direction B may be slightly shorter than the length of the reduced diameter portion 75 in the up-down direction B.

[0037] The plug socket 66 is formed in a cylindrical shape and surrounds the energizing plug 74 of the electrical connector 7. A gap is provided between the energizing plug 74 of the electrical connector 7 and the plug socket 66 to allow for attachment of a power cable (active cord).

[0038] The electrical connector (connecting member, plug) 7 can be connected to a high-frequency power supply device (not shown) via a power cable, and is electrically and physically connected to the proximal connection portion 2b. The proximal connection portion 2b connected to the electrical connector 7 does not have a coil sheath 13, but has a wire 21 and a pipe 22 arranged therein. The electrical connector 7 can supply high-frequency current supplied from the high-frequency power supply device to the forceps 4 via the pipe 22 and the wire 21.

[0039] The coil spring support portion 67 is a recess having a circular inner circumferential surface, and the recess supports the coil spring 9.

[0040] The coil sheath support portion 69 supports the base end of the coil sheath 13 so that the base end of the coil sheath 13 is rotatable about the longitudinal axis and does not move back and forth relative to the handle body 6 along the longitudinal axis direction A. As shown in FIG. 3 , the tip end of the pipe 22 overlaps with the base end of the coil sheath 13 inside the handle body 6. The electrical connector 7 is disposed on the tip side A1 of the pipe 22. In the longitudinal axis direction A of the wire 21, the base end 13p of the coil sheath 13 is disposed between the tip 22b of the pipe 22 and the electrical connector 7.

[0041] FIG. 4 is a cross-sectional view of the slider 8. The slider 8 is attached so as to be movable back and forth in the longitudinal axis direction A along the second handle body 61. The slider 8 is movable back and forth along the longitudinal axis relative to the second handle body 61. The proximal end of the wire 21 and the proximal end of the pipe 22 are connected to the slider 8. When the surgeon moves the slider 8 back and forth relative to the second handle body 61, the wire 21 and the pipe 22 move back and forth. When the surgeon rotates the second handle body 61 and the slider 8 around the longitudinal axis relative to the first handle body 60, the wire 21 and the pipe 22 rotate.

[0042] The slider 8 has an operation wire support part 81 that supports the wire 21 and the pipe 22. The wire 21 and the pipe 22 are fixed to the operation wire support part 81. Specifically, the wire 21 and the pipe 22 are fixed to the operation wire support part 81 by passing between two separate operation wire support parts 81 in an S-shaped snake. It is not necessary to fix both the wire 21 and the pipe 22 to the slider 8. For example, the base end of the wire 21 may be fixed to an arbitrary position on the pipe 22, and only the pipe 22 may be fixed to the slider 8. It is not necessary for the pipe 22 to be a pipe in the strict sense, and it may be any member that functions as the transmission member 2A, such as a pipe provided with a spiral groove or a coil tube made of a highly rigid metal.

[0043] FIG. 5 is a diagram showing the coil spring 9. As shown in FIG. The coil spring (elastic member, elastic body) 9 applies a biasing force to the pipe 22, thereby electrically connecting the pipe 22 (the wire 21 passing through the pipe 22) and the electrical connector 7. The coil spring 9 is supported by the coil spring support portion 67 so as to be elastically deformable in the up-down direction B. That is, the coil spring 9 is supported by the coil spring support portion 67 (recess) so as to be elastically deformable in the extension direction of the electrical connector 7. The coil spring 9 is a conductive compression spring, and an elastic force acts in the extension direction along the up-down direction B. Specifically, the coil spring 9 comes into direct contact with the pipe 22 and presses the pipe 22 against the electrical connector 7 (the connecting portion 71 of the electrical connector 7). The coil spring 9 biases the pipe 22 toward the electrical connector 7 (the connecting portion 71 of the electrical connector 7) and presses the pipe 22 against the inner surface of the insertion passage 72 of the electrical connector 7. Coil spring 9 is in a compressed state and in contact with pipe 22, and with pipe 22 pressed against the inner surface of insertion passage 72 of electrical connector 7, pipe 22 and wire 21 passing through pipe 22 can move forward and backward through insertion passage 72 of electrical connector 7 and can also rotate relative to electrical connector 7. In other words, with pipe 22 pressed against electrical connector 7, pipe 22 and wire 21 passing through pipe 22 can move forward and backward (slide) relative to electrical connector 7 along the longitudinal axis of pipe 22 and can rotate (slide) relative to electrical connector 7 in a direction around the longitudinal axis of pipe 22.

[0044] In this embodiment, the upper end (second end) 70 of the electrical connector 7 is inserted into the coil spring 9. The coil spring 9 is arranged in a compressed state between the bottom surface of the recess of the coil spring support portion 67 and the pipe 22. The coil spring 9 presses the pipe 22, which is inserted through the insertion passage 72, against the lower side B2 with its biasing force, thereby electrically connecting the pipe 22 (the wire 21 passing through the pipe 22) to at least a portion of the insertion passage 72 of the electrical connector 7.

[0045] FIG. 6 is a cross-sectional view of the coil spring 9. In this embodiment, an end turn 91 is provided at the end of the lower side B2 of the coil spring 9 (the portion that comes into contact with the pipe 22). The end turn 91 has, for example, one to two turns. Because the coil pitch of the end turn 91 is narrow, the pipe 22 does not enter the end turn 91. Specifically, the coil pitch of the end turn 91 is smaller than the outer diameter of the pipe 22 that passes through the insertion passage 72. Therefore, even if the pipe 22 rotates, the pipe 22 can be prevented from entering the inside of the coil spring 9 from the end of the lower side B2 of the coil spring 9, and smooth rotation of the pipe 22 is not hindered. Note that an end turn with a narrow pitch may also be provided at the upper end of the coil spring 9.

[0046] In this embodiment, the upper end 70 of the electrical connector 7 is inserted into the coil spring 9. Therefore, the coil spring 9 can sandwich the electrical connector 7 and press the pipe 22 against the lower side B2 from both sides. This allows for a stable electrical connection between the pipe 22 (the wire 21 passing through the pipe 22) and the electrical connector 7. Furthermore, the contact area between the pipe 22 and the electrical connector 7 is increased. This prevents an increase in electrical resistance due to a reduced contact area between the pipe 22 and the electrical connector 7. If the elastic force of the coil spring 9 is too strong, the pipe 22 may come into contact with the insertion passage 72 too strongly, which may affect the advancing and retracting movement of the pipe 22 and the advancing and retracting operation of the slider 8. Therefore, it is desirable for the coil spring 9 to have an elastic force that does not provide excessive resistance to the advancing and retracting operation of the slider 8. Similarly, it is desirable for the coil spring 9 to have an elastic force that does not provide excessive resistance to the rotational movement of the pipe 22 and the rotational operation of the slider 8.

[0047] To position the forceps 4 at an appropriate treatment position, the surgeon grasps the slider 8 and moves it forward and backward or rotates it, thereby advancing and retracting or rotating the forceps 4. Even when the slider 8 moves forward and backward relative to the second handle body 61 or when the second handle body 61 and the slider 8 rotate relative to the first handle body 60, the coil spring 9 presses the pipe 22 against the electrical connector 7, thereby reliably ensuring electrical connection between the pipe 22 and the wire 21 passing through the pipe 22 and the electrical connector 7.

[0048] Even when the slider 8 is rotated around the longitudinal axis of the sheath 1, the electrical connector 7 does not rotate around the longitudinal axis of the sheath 1, so the power cable (active cord) connected to the electrical connector 7 does not become tangled in the operating unit 5.

[0049] The surgeon applies a high-frequency current to the proximal connection portion 2b (wire 21 and pipe 22). Regardless of which direction perpendicular to the longitudinal axis direction A of the operation unit 5 faces vertically downward, at least a portion of the insertion passage 72 comes into electrically conductive contact with the pipe 22. Therefore, regardless of the position of the operation unit 5, a high-frequency current is applied from the electrical connector 7 to the wire 21 and the pipe 22, and the forceps 4 can be used to stop bleeding or perform incision on the bleeding area.

[0050] According to the endoscopic treatment tool 100 of this embodiment, electrical connection between the electrical connector 7 to which high-frequency current is supplied and the wire 21 and pipe 22 connected to the forceps 4 is reliably ensured regardless of the posture of the operating section 5.

[0051] Although the first embodiment of the present invention has been described above in detail with reference to the drawings, the specific configuration is not limited to this embodiment and includes design modifications within the scope of the present invention. Furthermore, the components shown in the above-described embodiment and modifications can be configured by appropriately combining them.

[0052] FIG. 7 is a diagram showing an elastic spring 9A, which is a modified example of the coil spring 9. As shown in FIG. Elastic spring (elastic member, elastic body) 9A is an elastic member such as rubber. Like coil spring 9, elastic spring 9A applies a biasing force to pipe 22, thereby electrically connecting pipe 22 (wire 21 passing through pipe 22) and electrical connector 7. In other words, the elastic member electrically connecting pipe 22 and electrical connector 7 may be a conductor such as coil spring 9, or a non-conductor such as elastic spring 9A.

[0053] FIG. 8 is a diagram showing another embodiment of the coil spring 9. In FIG. The coil spring 9 does not have to be disposed on the outer periphery of the upper end portion 70 of the electrical connector 7. As shown in Fig. 8, the coil spring 9 may be disposed at a position spaced apart from the electrical connector 7 and apply a biasing force to the pipe 22, thereby electrically connecting the pipe 22 (the wire 21 passing through the pipe 22) and the electrical connector 7.

[0054] FIG. 9 is a diagram showing another embodiment of the coil spring 9. In FIG. There may be a plurality of coil springs 9. The plurality of coil springs 9 can suitably connect the pipe 22 (the wire 21 passing through the pipe 22) and the electrical connector 7.

[0055] Second Embodiment An endoscopic treatment tool 100B according to a second embodiment of the present invention will be described with reference to Fig. 10. In the following description, components common to those already described will be assigned the same reference numerals, and duplicated description will be omitted.

[0056] [Endoscopic treatment tool 100B] The endoscopic treatment tool 100B (also referred to as treatment tool 100B) is a hemostatic forceps that cauterizes an affected area to stop bleeding. The treatment tool 100B includes a sheath 1, an elongated member 2, a transmission member 2A, a support member 3, forceps (jaws) 4, and an operation unit 5B.

[0057] FIG. 10 is a cross-sectional view of the operation unit 5B. The operating section (handle, handle assembly) 5B is provided on the proximal end side A2 of the sheath 1. The operating section 5B includes a handle body 6, an electrical connector 7B, a slider 8, and a coil spring 9B. In this embodiment, the electrical connector 7B is attached to the handle body 6.

[0058] Electrical connector (connecting member, plug) 7B can be connected to a high-frequency power supply device (not shown) via a power cable, and is electrically connected to pipe 22 (the proximal end of wire 21) via coil spring 9B. Proximal end connection portion 2b connected to electrical connector 7B does not have coil sheath 13, but has wire 21 and pipe 22 arranged therein. Electrical connector 7B can supply high-frequency current supplied from the high-frequency power supply device to forceps 4 via pipe 22 and wire 21. Electrical connector 7B is positioned away from wire 21 and pipe 22.

[0059] The handle body 6 has a connector support portion 64. The connector support portion 64 is provided on the first handle body 60. The electrical connector 7B is supported by the connector support portion 64 and is formed in a substantially cylindrical shape extending in a direction intersecting the longitudinal axis of the pipe 22. Note that "substantially cylindrical" includes not only a strict cylindrical shape but also a shape close to a cylindrical shape. In this embodiment, the electrical connector 7B extends in the vertical direction B.

[0060] The electrical connector 7B extends in a direction intersecting the longitudinal axis of the pipe 22. The electrical connector 7B has an engaging portion 73, an energizing plug 74, and a reduced diameter portion 75. The engaging portion 73 is provided at the upper end of the electrical connector 7B and engages with the coil spring 9B. The electrical connector 7B extends between the energizing plug (first end) 74 and the engaging portion (second end) 73.

[0061] The connector support portion 64 supports the electrical connector 7B and has a plug socket 66 that covers the energized plug 74 with a gap S therebetween. The connector support portion 64 has a through hole 65 that connects the gap S to the internal space 6t. With the electrical connector 7B inserted into the through hole 65, the electrical connector 7B is positioned relative to the connector support portion 64.

[0062] The electrical connector 7B is supported by the connector support portion 64. Specifically, the electrical connector 7B is fixed to the connector support portion 64 by providing a flange 76 on the engagement portion 73 and sandwiching a part of the connector support portion 64 (the edge of the through hole 65) between the flange 76 and the conductive plug 74.

[0063] The flange 76 is a protrusion that protrudes radially outward from the electrical connector 7 B. The flange 76 is disposed between the energizing plug 74 and the pipe 22 .

[0064] The coil spring (elastic member, elastic body) 9B electrically connects the pipe 22 (the wire 21 passing through the pipe 22) and the electrical connector 7B. The coil spring 9B is sandwiched in a compressed state between the pipe 22 and the electrical connector 7B (more specifically, the engaging portion 73 or the flange 76) in the internal space 6t of the handle body 6. The coil spring 9B is a conductive compression spring, and an elastic force acts in the direction in which the electrical connector 7B extends. Specifically, the coil spring 9B is in direct contact with the pipe 22 and presses the pipe 22 in a direction away from the engaging portion (second end) 73 of the electrical connector 7B. In other words, the coil spring 9B presses the pipe 22 from a direction intersecting the longitudinal axis of the pipe 22. When the pipe 22 is pressed by the coil spring 9B, the pipe 22 is elastically deformed, and a restoring force is generated in the pipe 22 to restore the pipe 22 to its original shape, causing the pipe 22 to press back against the coil spring 9B. This allows the pipe 22 and the coil spring 9B to be constantly in contact with each other. At the base-end connecting portion 2b, the wire 21 and the inner peripheral surface of the pipe 22 are constantly in contact with each other. When the coil spring 9B presses the pipe 22 in a direction away from the engaging portion (second end) 73 of the electrical connector 7B, the pipe 22 is slightly bent in the opposite direction. In this state, the pipe 22 and the wire 21 passing through the pipe 22 can move forward and backward with respect to the electrical connector 7B, and can also rotate. In other words, when the pipe 22 is pressed in a direction away from the electrical connector 7B, the pipe 22 and the wire 21 passing through the pipe 22 can move forward and backward (slide) with respect to the electrical connector 7B in a direction along the longitudinal axis of the pipe 22, and can also rotate (slide) with respect to the electrical connector 7B in a direction around the longitudinal axis of the pipe 22.

[0065] In this embodiment, the coil spring (elastic member, elastic body) 9B applies a biasing force to the pipe 22, thereby electrically connecting the pipe 22 and the wire 21 passing through the pipe 22 to the electrical connector 7B. The coil spring 9B is supported in the internal space 6t of the handle body 6 so as to be elastically deformable in the vertical direction B. The coil spring 9B is a conductive compression spring, and an elastic force acts in the direction extending in the vertical direction B.

[0066] In this embodiment, the coil spring 9B is placed in a compressed state in the space between the pipe 22 and the engaging portion 73 of the electrical connector 7B. The coil spring 9B presses the pipe 22 toward the upper side B1 with its biasing force, thereby electrically connecting the pipe 22 and the wire 21 passing through the pipe 22 to the engaging portion 73 of the electrical connector 7B. Note that the upper and lower ends of the coil spring 9B may be provided with narrow-pitch end turns.

[0067] According to the endoscopic treatment tool 100B of this embodiment, electrical connection between the electrical connector 7B to which high-frequency current is supplied and the wire 21 and pipe 22 connected to the forceps 4 is reliably ensured regardless of the posture of the operating section 5B.

[0068] Although the second embodiment of the present invention has been described above in detail with reference to the drawings, the specific configuration is not limited to this embodiment and includes design modifications within the scope of the present invention. Furthermore, the components shown in the above embodiment and modified examples can be configured by appropriately combining them.

[0069] 11 to 13 are diagrams showing a leaf spring 9G which is a modified example of the coil spring 9B. The leaf spring 9G electrically connects the pipe 22 (the wire 21 passing through the pipe 22) to the electrical connector 7B by applying a biasing force to the pipe 22. The leaf spring 9G is disposed in a compressed state in the space between the pipe 22 and the engaging portion 73 of the electrical connector 7B. The leaf spring 9G presses the pipe 22 toward the upper side B1 with its biasing force, electrically connecting the pipe 22 (the wire 21 passing through the pipe 22) to the engaging portion 73 of the electrical connector 7B.

[0070] (Third embodiment) An endoscopic treatment tool 100C according to a third embodiment of the present invention will be described with reference to Fig. 14. In the following description, components common to those already described will be assigned the same reference numerals, and duplicated description will be omitted.

[0071] [Endoscopic treatment tool 100C] The endoscopic treatment tool 100C (also referred to as treatment tool 100C) is a hemostatic forceps that cauterizes an affected area to stop bleeding. The treatment tool 100C includes a sheath 1, an elongated member 2, a transmission member 2A, a support member 3, forceps (jaws) 4, and an operation section 5C.

[0072] FIG. 14 is a cross-sectional view of the operation unit 5C. The operation section (handle, handle assembly) 5C is provided on the proximal end side A2 of the sheath 1. The operation section 5C includes a handle body 6, an electrical connector 7B, a slider 8, and a coil spring 9C. In this embodiment, the electrical connector 7B is attached to the handle body 6.

[0073] The coil spring (elastic member, elastic body) 9C applies a biasing force to the pipe 22, thereby electrically connecting the pipe 22 and the electrical connector 7B. The coil spring 9C includes a first coil spring 91C and a second coil spring 92C. The first coil spring 91C is supported by the coil spring support portion 67 in the internal space 6t of the handle body 6 so as to be elastically deformable along the vertical direction B. That is, the first coil spring 91C is a conductive compression spring and is supported by the coil spring support portion 67 (recess). The first coil spring 91C is disposed in a compressed state between the coil spring support portion 67 and the pipe 22. Specifically, the first coil spring 91C comes into direct contact with the pipe 22 and presses the pipe 22 toward the engaging portion (second end) 73 of the electrical connector 7B. That is, the first coil spring 91C presses the pipe 22 in a direction intersecting the longitudinal axis of the pipe 22. The second coil spring 92C is a conductive compression spring and is disposed in a compressed state between the electrical connector 7B (more specifically, the engaging portion 73 or the flange 76) and the pipe 22. Specifically, the second coil spring 92C is in direct contact with the pipe 22 and presses the pipe 22 in a direction away from the engaging portion (second end) 73 of the electrical connector 7B. That is, the second coil spring 92C presses the pipe 22 from a direction intersecting the longitudinal axis of the pipe 22. The first coil spring 91C presses the pipe 22 in a direction opposite to the direction in which the second coil spring 92C presses the pipe 22, thereby preferably maintaining a state in which the second coil spring 92C and the pipe 22 are constantly in contact with each other. Note that, at the base end connecting portion 2b, the wire 21 is always in contact with the inner circumferential surface of the pipe 22. With first coil spring 91C and second coil spring 92C both pressing against pipe 22, pipe 22 and wire 21 passing through pipe 22 can advance and retreat and rotate relative to electrical connector 7B. That is, with pipe 22 pressed against second coil spring 92C, pipe 22 and wire 21 passing through pipe 22 can advance and retreat (slide) relative to electrical connector 7B in a direction along the longitudinal axis of pipe 22 and can rotate (slide) relative to electrical connector 7B in a direction around the longitudinal axis of pipe 22.

[0074] In this embodiment, the coil spring 9C is disposed in the internal space 6t of the handle body 6, in the space between the upper inner wall 6a of the handle body 6 and the engaging portion 73 of the electrical connector 7B. The pipe 22 passes through the coil spring 9C in the longitudinal axis direction A. That is, the coil spring 9C is disposed on both sides of the pipe 22 in the vertical direction B. The coil spring 9C may be a single spring, or may be divided into two parts and disposed on both sides of the pipe 22 in the vertical direction B.

[0075] Even when the pipe 22 moves in the vertical direction B, the biasing force of the coil spring 9C allows the coil spring 9C to maintain contact with the pipe 22, electrically connecting the pipe 22 with the engaging portion 73 of the electrical connector 7B. Narrow-pitch end turns may be provided at the upper and lower ends of the first coil spring 91C and the second coil spring 92C.

[0076] According to the endoscopic treatment tool 100C of this embodiment, electrical connection between the electrical connector 7B to which high-frequency current is supplied and the wire 21 and pipe 22 connected to the forceps 4 is reliably ensured regardless of the posture of the operating section 5C.

[0077] Although the third embodiment of the present invention has been described above in detail with reference to the drawings, the specific configuration is not limited to this embodiment and includes design modifications within the scope of the present invention. Furthermore, the components shown in the above embodiment and modifications can be configured by appropriately combining them.

[0078] (Fourth embodiment) An endoscopic treatment tool 100E according to a fourth embodiment of the present invention will be described with reference to Fig. 15 and Fig. 16. In the following description, components common to those already described will be assigned the same reference numerals, and duplicated description will be omitted.

[0079] [Endoscopic treatment tool 100E] The endoscopic treatment tool 100E (also referred to as the treatment tool 100E) is a hemostatic forceps that cauterizes an affected area to stop bleeding. The treatment tool 100E includes a sheath 1, an elongated member 2, a transmission member 2A, a support member 3, forceps (jaws) 4, and an operation unit 5E.

[0080] Fig. 15 is a cross-sectional view of the operation unit 5E, and Fig. 16 is a perspective view of the operation unit 5E. The operating section (handle, handle assembly) 5E is provided on the proximal end side A2 of the sheath 1. The operating section 5E includes a handle main body 6E, an electrical connector 7E, a slider 8, and a coil spring 9E. In this embodiment, the electrical connector 7E is attached to the handle main body 6E.

[0081] The handle main body 6E has an internal space 6s through which the wire 21 can be inserted. The wire 21 passes through the internal space of the sheath 1 and the internal space 6s of the handle main body 6 and extends to the slider 8. The handle main body 6E has a thumb ring 62, a connector support part 64E, and a coil sheath support part 69.

[0082] The handle body 6E has a first handle body 60 and a second handle body 61. The second handle body 61 is connected to the base end of the first handle body 60. The first handle body 60 and the second handle body 61 are connected to be relatively rotatable about a rotation axis extending in the longitudinal axis direction A. The internal space 6s is a continuous space formed in the first handle body 60 and the second handle body 61. The internal space 6s has an internal space 6t formed in the first handle body 60 and an internal space 6u formed in the second handle body 61.

[0083] 15, the tip end of the pipe 22 overlaps with the base end of the coil sheath 13 inside the handle body 6E, and the electrical connector 7E is disposed on the tip side A1 of the pipe 22. In the longitudinal axis direction A of the wire 21, the base end 13p of the coil sheath 13 is disposed between the tip 22b of the pipe 22 and the electrical connector 7E.

[0084] The electrical connector 7E is a conductive member extending in a direction intersecting the longitudinal axis of the pipe 22 and is formed in a substantially cylindrical shape. Note that the term "substantially cylindrical" includes not only a strict cylindrical shape but also a shape close to a cylindrical shape. In this embodiment, the electrical connector 7E extends in the up-down direction B.

[0085] The electrical connector 7E has an upper end portion 70, a connecting portion 71, an energizing plug 74, a reduced diameter portion 75, and a flange 76. As shown in Fig. 15, the electrical connector 7E extends between the energizing plug (first end portion) 74 and the upper end portion (second end portion) 70. The connecting portion 71 and the reduced diameter portion 75 are located between the energizing plug (first end portion) 74 and the upper end portion (second end portion) 70. The connecting portion 71 has an insertion passage 72 that extends in a direction intersecting the extension direction of the electrical connector 7E.

[0086] The connector support portion 64E is provided on the first handle body 60. The connector support portion 64E supports the electric connector 7E and has a plug socket 66 that covers the energized plug 74 with a gap S therearound. The connector support portion 64E has a through hole 65 that connects the gap S with the internal space 6t. With the electric connector 7E inserted into the through hole 65, the electric connector 7E is positioned relative to the connector support portion 64E.

[0087] The handle body 6E has a fitting portion 68. The fitting portion 68 is a circular recess with an inner circumferential surface that supports an upper end portion 70 of the electrical connector 7E. The gap between the upper end portion 70 of the electrical connector 7E and the fitting portion 68 is narrow, preventing the electrical connector 7E from wobbling.

[0088] The electrical connector 7E (specifically, the conductive plug 74) can be connected to a high-frequency power supply device (not shown) via a power cable, and is electrically and physically connected to the proximal connection portion 2b. The proximal connection portion 2b connected to the electrical connector 7E does not have a coil sheath 13, but has a wire 21 and a pipe 22 arranged therein. The electrical connector 7E can supply high-frequency current supplied from the high-frequency power supply device to the forceps 4 via the pipe 22 and the wire 21.

[0089] The electrical connector 7E is supported by the connector support portion 64E and the fitting portion 68. Specifically, the electrical connector 7E is fixed to the connector support portion 64E by sandwiching a portion of the connector support portion 64E (the edge of the through-hole 65) between the flange 76 and the energized plug 74. The electrical connector 7E extends in a direction intersecting the longitudinal axis of the wire 21. The flange 76 is disposed between the energized plug 74 and the pipe 22.

[0090] The flange 76 is provided between the energizing plug 74 and the upper end portion 70. Specifically, it is provided between the reduced diameter portion 75 of the electrical connector 7E and the connecting portion 71. The flange 76 is a protrusion that protrudes radially outward from the electrical connector 7E.

[0091] The coil spring (elastic member, elastic body) 9E applies a biasing force to the pipe 22, thereby electrically connecting the pipe 22 (the wire 21 passing through the pipe 22) and the electrical connector 7E. A portion (the connecting portion 71) of the electrical connector 7E is inserted through the coil spring 9E. This prevents the coil spring 9E from shifting in the longitudinal axis direction of the pipe 22, thereby suppressing the occurrence of electrical conduction failures. The coil spring 9E is sandwiched in a compressed state between the pipe 22 and the electrical connector 7E (more specifically, the flange 76) in the internal space 6t of the handle body 6E. The coil spring 9E is a conductive compression spring, and an elastic force acts in the direction in which the electrical connector 7E extends. Specifically, the coil spring 9E comes into direct contact with the pipe 22 to press the pipe 22 against the electrical connector 7E (the inner surface of the insertion passage 72 of the electrical connector 7E). That is, the coil spring 9E presses the pipe 22 in a direction intersecting the longitudinal axis of the pipe 22. When the pipe 22 is pressed by the coil spring 9E, the pipe 22 elastically deforms, and a restoring force is generated in the pipe 22 to return it to its original shape, causing the pipe 22 to push back the coil spring 9E. This allows the pipe 22 and the coil spring 9E to maintain a constant state of contact. Note that in the base-end connecting portion 2b, the wire 21 and the inner surface of the pipe 22 are always in contact. The coil spring 9E biases the pipe 22 toward the upper end 70 of the electrical connector 7E. When the pipe 22 is pressed against the upper end 70 of the electrical connector 7E by the coil spring 9E, the pipe 22 is slightly bent toward the upper end 70 of the electrical connector 7E. Coil spring 9E is in a compressed state and contacts pipe 22, and with pipe 22 pressed against the inner surface of insertion passage 72 of electrical connector 7E, pipe 22 and wire 21 passing through pipe 22 can move forward and backward through insertion passage 72 of electrical connector 7E and can rotate relative to electrical connector 7E. In other words, with pipe 22 pressed against electrical connector 7E, pipe 22 and wire 21 passing through pipe 22 can move forward and backward (slide) relative to electrical connector 7E in a direction along the longitudinal axis of pipe 22 and can rotate (slide) relative to electrical connector 7E in a direction around the longitudinal axis of pipe 22.

[0092] FIG. 17 is a diagram showing the current path from the electrical connector 7E to the pipe 22. As shown in FIG. There are three current paths from the electrical connector 7E to the pipe 22 (base end connection portion 2b): path R1, path R2, and path R3. Path R1 is from the electrical connector 7E (upper end 70) to the pipe 22 (base end connection portion 2b). Path R2 is from the coupling portion 71 of the electrical connector 7E to the pipe 22 (base end connection portion 2b) via the coil spring 9E. Path R3 is from the flange 76 of the electrical connector 7E to the pipe 22 (base end connection portion 2b) via the coil spring 9E. In particular, path R3 ensures constant contact between the coil spring 9E and the flange 76. This multiple current paths configuration reduces the occurrence of poor electrical conduction. This reduces sliding resistance, such as the rotation and advance / retraction of the pipe 22 relative to the electrical connector 7E and the wire 21 passing through the pipe, while ensuring stable electrical conduction. Narrow-pitch end turns may be provided at the upper and lower ends of the coil spring 9E.

[0093] The length L1 of the plug socket 66 in the vertical direction B is longer than the length L2 of the energizing plug 74 in the vertical direction B. Therefore, the energizing plug 74 is less likely to be connected to the power cable while tilted relative to the vertical direction B. Furthermore, the upper fitting portion 68 prevents the electric connector 7E from wobbling, making it easier for the power cable and the energizing plug 74 to be connected straight in the vertical direction B. As a result, it is possible to prevent the electric connector 7E from bending, which would make it difficult to connect to the power cable.

[0094] 15 and 16, the handle body 6E is formed with a concave surface (indicator) 6e that can be gripped with the thumb or the like. In the longitudinal axis direction A of the operation unit 5E, the electrical connector 7E and the plug socket 66 are fixed at a position that overlaps with the concave surface 6e. This makes it easy for the surgeon to grip the handle body 6E.

[0095] According to the endoscopic treatment tool 100E of this embodiment, regardless of the posture of the operating section 5E, it is possible to reliably ensure electrical connection between the electrical connector 7E to which high-frequency current is supplied and the wire 21 and pipe 22 connected to the forceps 4, while simultaneously allowing the wire 21 to rotate and move forward and backward relative to the electrical connector 7E.

[0096] Although the fourth embodiment of the present invention has been described above in detail with reference to the drawings, the specific configuration is not limited to this embodiment and includes design modifications within the scope of the present invention. Furthermore, the components shown in the above-described embodiment and modifications can be configured by appropriately combining them.

[0097] 18 is a diagram showing an operation unit 5D which is a modified example of the operation unit 5, operation unit 5B, and operation unit 5C. In the operation unit 5D, an electrical connector 7 is attached to a slider 8. Even when the electrical connector 7 is attached to the slider 8, the electrical connection between the electrical connector 7 and the elongated member 2 is reliably ensured by a coil spring (elastic member, elastic body).

[0098] 19 is a diagram showing the treatment section (end effector) 110. The treatment section (end effector) 110 will be further explained below.

[0099] The support member 3 includes a cylindrical support body 30, a frame 31, a connecting member 32, a rod 33, and a link mechanism 34. The support body 30 is attached to the distal end 1a of the sheath 1 and is rotatable about a rotation axis along the longitudinal axis direction A. The frame 31 is attached to the support body 30 and protrudes from the distal end 1a of the sheath 1 toward the distal end side A1. The connecting member 32 connects the distal end of the wire 21 to the rod 33. The rod 33 is a rod-shaped member and protrudes from the distal end 1a of the sheath 1 toward the distal end side A1. The rod 33 advances and retreats along the frame 31 in the longitudinal axis direction A. The distal end of the rod 33 is connected to the link mechanism 34. The proximal end of the rod 33 is connected to the connecting member 32. The link mechanism 34 converts the advancement and retreat movement of the rod 33 into the opening and closing movement of the forceps 4. The link mechanism 34 includes a first link 341 and a second link 342.

[0100] The forceps 4 has a pin 40, a first forceps blade 41, and a second forceps blade 42. The first forceps blade 41 and the second forceps blade 42 have gripping portions 4a for gripping tissue. The pin 40 is fixed to the frame 31. The first forceps blade 41 and the second forceps blade 42 are rotatably connected around the pin 40, which extends in a direction perpendicular to the longitudinal axis direction A, and can open and close toward the distal end side A1. The first forceps blade 41 is connected to a first link 341 on a side A2 closer to the base end than the pin 40. The second forceps blade 42 is connected to a second link 342 on a side A2 closer to the base end than the pin 40. As the rod 33 advances, the first link 341 and the second link 342 move away from each other in the radial direction R, opening the first forceps blade 41 and the second forceps blade 42. As the rod 33 moves backward, the first link 341 and the second link 342 move closer to each other in the radial direction R, closing the first forceps piece 41 and the second forceps piece 42 . [Explanation of symbols]

[0101] 300 Endoscopic Treatment System 200 Endoscope 100, 100B, 100C, 100E Endoscopic treatment tools 110 Treatment unit (end effector) 1 sheath 13 Coil sheath 2 Long members 21 Wire (long member) 2A Transmission component 22 Pipe (transmission component) 3 Support member 4 forceps (jaws) 41 First forceps piece 42 Second forceps piece 5, 5B, 5C, 5D, 5E Operating unit (handle, handle assembly) 6, 6E Handle body 6s interior space 60 First handle body 61 Second handle body 62 Thumb Ring 64 Connector support 65 through holes 66 Plug Socket 67 Coil spring support 68 Fitting part 7, 7B, 7E Electrical connectors (connecting members, plugs) 70 Upper end (second end) 71 Connecting part 72 Passageway 73 Engagement part (second end) 74 Electrical plug (first end) 75 Reduced diameter part 76 flange 8 Slider 81 Operation wire support part 9 Coil springs (elastic materials, elastic bodies) 9A Elastic spring (elastic member, elastic body) 9B Coil spring (elastic member, elastic body) 9G Leaf spring (elastic material, elastic body) 9C Coil spring (elastic material, elastic body)

Claims

1. The handle body and a transmission member that transmits a high-frequency current; a conductive connector extending in a direction intersecting the longitudinal axis of the transmission member; an elastic body that presses the transmission member against the connector; Equipped with the elastic body is in contact with the transmission member and, in a state where the transmission member is pressed against the connector, the transmission member is slidable relative to the connector. Handle assembly.

2. a plug to which a power cable for transmitting the high-frequency current can be connected is provided at a first end of the conductive connector; An insertion passage extending in the longitudinal direction of the handle body is formed in a second end of the conductive connector, The transmission member is inserted into the insertion passage, and the transmission member is pressed against the inner surface of the insertion passage by the elastic body. The handle assembly of claim 1 .

3. the transmission member includes a pipe through which a wire passes, The elastic body is in direct contact with the pipe and presses the pipe against the connector. The handle assembly of claim 1 .

4. The elastic body is a coil-shaped compression spring. The handle assembly of claim 1 .

5. The elastic body is sandwiched and disposed between the transmission member and the connector in a compressed state. The handle assembly of claim 1 .

6. the connector has a first end having a plug to which a power cable for transmitting the high-frequency current can be connected, and a second end to which the transmission member is pressed, The connector has a flange located between the plug and the transmission member, the elastic body is sandwiched between the transmission member and the flange in a compressed state, The elastic body biases the transmission member toward the second end. The handle assembly of claim 1 .

7. the elastic body is a coil-shaped compression spring, At least a portion of the connector passes through the compression spring. The handle assembly of claim 6.

8. When the transmission member is pressed against the second end of the connector by the elastic body, the transmission member is bent toward the second end of the connector. The handle assembly of claim 2 .

9. With the transmission member pressed against the connector, the transmission member is slidable relative to the connector in a direction around the longitudinal axis of the transmission member. The handle assembly of claim 1 .

10. With the transmission member pressed against the connector, the transmission member is slidable relative to the connector in a direction along the longitudinal axis of the transmission member. The handle assembly of claim 1 .

11. the elastic body is conductive, biases the transmission member in the extension direction of the connector, and contacts the transmission member in a compressed state; The handle assembly of claim 1 .

12. The handle body and a transmission member that transmits a high-frequency current; a conductive connector extending in a direction intersecting the transmission member; a spring disposed in a compressed state between the transmission member and the connector; Equipped with The transmission member and the spring are in direct contact with each other, thereby electrically connecting the transmission member and the connector. Handle assembly.

13. The transmission member and the spring are in direct contact with each other, thereby electrically connecting the transmission member, the spring, and the connector. The handle assembly of claim 12.

14. Sheath and an end effector disposed at the distal end of the sheath; an elongate member coupled to the end effector; A handle assembly according to any one of claims 1 to 13; Equipped with the transmission member transmits a high-frequency current to the elongated member; Endoscopic treatment tools.

15. Sheath and an end effector disposed at the distal end of the sheath; a handle coupled to a proximal end of the sheath; an elongate member coupled to the end effector; a transmission member that transmits a high-frequency current to the elongated member; Equipped with The handle is a conductive connector extending in a direction intersecting the transmission member; an elastic body that presses the transmission member against the connector; and The transmission member is slidable relative to the connector in a state where the transmission member is pressed against the connector. Endoscopic treatment tools.

16. a plug to which a power cable for transmitting the high-frequency current can be connected is provided at a first end of the conductive connector; an insertion passage extending in the longitudinal direction of the handle is formed in a second end of the conductive connector; The connector has a flange located between the plug and the transmission member, the elastic body is sandwiched between the transmission member and the flange in a compressed state, The elastic body biases the transmission member toward the second end. The endoscopic treatment tool according to claim 15.

17. The elongated member is inserted through a sheath, and the end effector rotates relative to the sheath. The endoscopic treatment tool according to claim 15.

18. The elongate member includes a wire. The endoscopic treatment tool according to claim 15.

19. the transmission member includes a pipe, the elastic body exerts a biasing force on the pipe by coming into contact with the pipe in a compressed state; The endoscopic treatment tool according to claim 18.

20. the connector has an insertion passage through which the transmission member is inserted, The elastic body applies a biasing force to electrically connect the transmission member and at least a part of the insertion passage. The endoscopic treatment tool according to claim 15.

21. the elastic body is a coil spring, The pitch of the end turns at both ends of the coil spring is narrower than that of other portions. The endoscopic treatment tool according to claim 15.

22. the connector is disposed at a position spaced apart from the transmission member, the elastic body applies a biasing force to the transmission member to electrically connect the transmission member and the connector; The endoscopic treatment tool according to claim 15.

23. The elastic bodies are arranged on both sides of the transmission member. The endoscopic treatment tool according to claim 15.

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