Endoscopic treatment tool

Abstract

To provide an endoscopic treatment tool that restrains occurrence of opening on one side.SOLUTION: An endoscopic treatment tool comprises: a sheath; a wire inserted into the sheath, and capable of being advanced and retreated in a longitudinal direction of the sheath; a connection member connected to a tip part of the wire; and forceps comprising a first forceps piece and a second forceps piece capable of being mutually opened and closed by advance and retreat of the wire, and connected via the connection part. The first forceps piece and the second forceps piece comprise contact parts to be brought into contact with a tip part of the connection member in the longitudinal direction when the forceps are opened.SELECTED DRAWING: Figure 9

Description

[Technical field]

[0001] The present invention relates to an endoscopic treatment tool. This application claims priority to U.S. Provisional Patent Application No. 63 / 583,983, filed in the United States on September 20, 2023, the contents of which are incorporated herein by reference. [Background technology]

[0002] Conventionally, in endoscopic treatment, endoscopic treatment tools such as hemostatic forceps are used to cauterize a bleeding treatment target to stop the bleeding. The hemostatic forceps cauterize the treatment target by passing a high-frequency current through the treatment target while holding the treatment target to stop the bleeding.

[0003] For example, an endoscopic forceps described in Patent Document 1 has an insertion tube to be inserted into a living body, a support member connected to the tip of the insertion tube, a pivot pin provided on the support member, a forceps member rotatably supported on the pivot pin, a cam groove formed in the forceps member, an operation section connected to the base end of the insertion tube, an advancing / retreating member that advances and retreats axially within the insertion tube in response to operation of the operation section, an insertion hole formed in the advancing / retreating member, and a cam pin that is inserted into the insertion hole and engages with the cam groove. When the cam pin moves along the cam groove as the advancing / retreating member advances and retreats, the forceps member rotates about the pivot pin in response to engagement of the cam pin with the cam groove to open and close. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2012-045031 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, in a forceps opening and closing mechanism using a cam groove (slide groove) such as the endoscopic forceps described in Patent Document 1, if the advancing and retreating member (connecting member) that advances and retreats in the axial direction of the insertion tube becomes eccentric with respect to the axial direction, the opening and closing axis of the forceps may become misaligned with the central axis of the insertion tube, resulting in one-sided opening.

[0006] In view of the above circumstances, an object of the present invention is to provide an endoscopic treatment tool that suppresses the occurrence of one-sided opening. [Means for solving the problem]

[0007] The endoscopic treatment tool of the present invention comprises a sheath, a wire inserted through the sheath and capable of advancing and retracting in the longitudinal direction of the sheath, a connecting member connected to the tip of the wire, and forceps having first and second forceps pieces that can be opened and closed relative to each other by advancing and retracting the wire, and connected via the connecting member, wherein the first forceps piece and the second forceps piece have abutment portions that abut against the tip of the connecting member in the longitudinal direction when the forceps are in an open state. Effect of the Invention

[0008] According to the endoscopic treatment tool of the present invention, it is possible to provide an endoscopic treatment tool which suppresses the occurrence of one-sided opening. [Brief description of the drawings]

[0009] [Figure 1] 1 is an overall view showing an endoscopic treatment system according to an embodiment of the present invention; [Diagram 2] 2 is an overall view showing an endoscopic treatment tool of the endoscopic treatment system. FIG. [Diagram 3] 4 is a cross-sectional view showing the distal end portion of the endoscopic treatment tool in a closed state. FIG. [Figure 4] FIG. 4 is a cross-sectional view showing the tip portion in a half-open state. [Diagram 5] FIG. 4 is a cross-sectional view showing the tip portion in an open state. [Figure 6] FIG. 4 is a plan view showing the tip portion in an open state. [Figure 7] FIG. 2 is a perspective view showing the forceps piece at the tip portion. [Figure 8] FIG. [Figure 9] 13 is a cross-sectional view showing the forceps pieces and the connecting member at the distal end portion in an open state. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] An endoscopic treatment system 300 according to an embodiment of the present invention will be described with reference to the drawings. In the following drawings, the scale of the dimensions of the components may differ from each other in order to make each component easier to see. FIG. 1 is an overall view showing an endoscopic treatment system 300 according to this embodiment.

[0011] [Endoscopic treatment system 300] 1, the endoscopic treatment system 300 includes an endoscopic treatment tool 100 and an endoscope 200. The endoscopic treatment tool (treatment tool) 100 is inserted into the endoscope 200 when in use.

[0012] [Endoscope 200] The endoscope 200 is a known flexible endoscope and includes 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.

[0013] The insertion section 210 is a long and slender 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 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.

[0014] The imaging section 213 includes an imaging element such as a CCD or a CMOS, and is capable of capturing an image of a site to be treated. The bending section 214 bends in response to a user's operation of the operation section 220. The flexible section 215 is a flexible tubular section.

[0015] 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 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 end opening of the channel 216.

[0016] The universal cord 230 connects the endoscope 200 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.

[0017] [Endoscopic treatment tool 100] FIG. 2 is an overall view showing the endoscopic treatment tool 100. As shown in FIG. An endoscopic treatment tool (treatment tool) 100 includes a sheath 1, a manipulation wire (wire) 2 (see FIG. 3), forceps (jaw) 4, a wire manipulation section 5, a coupling member 12, a support member (cover member) 13, and a connection member 14. In the following description, as shown in FIG. 2, in a longitudinal direction A along the central axis of the treatment tool 100, the side inserted into the patient's body is referred to as the "tip side (distal side) A1," and the wire manipulation section 5 side is referred to as the "base side (proximal side) A2."

[0018] Fig. 3 is a cross-sectional view of the tip of the treatment tool 100 in a closed state. Fig. 4 is a cross-sectional view of the tip of the treatment tool 100 in a half-open state. Fig. 5 is a cross-sectional view of the tip of the treatment tool 100 in an open state. The forceps 4, the support member 13, and the connection member 14 provided at the tip of the treatment tool 100 constitute a "treatment section 110" that treats the affected area.

[0019] In the following description, the direction in which the forceps 4 open and close is referred to as the "opening / closing direction B" or the "up-down direction B" as shown in Figures 3, 4, and 5. The direction in which the forceps piece (first forceps piece) 41 opens is referred to as the "downward B1" in the opening / closing direction B, and the direction in which the forceps piece (second forceps piece) 42 opens is referred to as the "upward B2" in the opening / closing direction B.

[0020] FIG. 6 is a plan view showing the distal end of the treatment tool 100 in an open state. As shown in Fig. 6, a direction perpendicular to the longitudinal direction A and the opening / closing direction B is defined as the "width direction C" or "left-right direction C." When looking from the tip end side A1 to the base end side A2, the direction facing left is defined as the "left side C1" in the width direction C, and the direction facing right is defined as the "right side C2" in the width direction C.

[0021] The sheath 1 is a long resin member that has flexibility and insulation properties and extends from a distal end 1a to a proximal end 1b as shown in Fig. 2. The sheath 1 has an outer diameter that allows it to be inserted into a channel 216 of the endoscope 200, and it is capable of advancing and retreating through the channel 216. When the sheath 1 is inserted into the channel 216, the distal end 1a of the sheath 1 can protrude and retract through a distal end opening 212 of the channel 216. A metallic coil sheath wound into a cylindrical shape is provided inside the sheath 1.

[0022] The operation wire 2 is inserted through the sheath 1 and the internal space of the coil sheath described above. The distal end of the operation wire 2 is connected to the forceps 4 via a connecting member 14, and the proximal end of the operation wire 2 is connected to the wire operation section 5.

[0023] The wire manipulation section 5 is provided on the base end side A2 of the sheath 1. The wire manipulation section 5 includes a handle body 6, a connector 7, a slider 8, and a rotating handle 9. In this embodiment, the connector 7 is attached to the slider 8.

[0024] The connector 7 can be connected to a high-frequency power supply device (not shown) and is electrically and physically connected to the base end of the manipulation wire 2. The connector 7 is connected to the high-frequency power supply device via, for example, an A cord (active cord). The connector 7 can supply a high-frequency current supplied from the high-frequency power supply device to the forceps 4 via the manipulation wire 2.

[0025] The slider 8 is attached so as to be movable forward and backward along a slit (not shown) formed in the handle body 6 and extending in the longitudinal direction A. The slider 8 is movable forward and backward along the longitudinal direction A relative to the handle body 6.

[0026] A proximal end of the operation wire 2 is connected to the slider 8. The operation wire 2 passes through the internal space of the sheath 1 and the internal space of the handle body 6 and extends to the slider 8. When the surgeon advances or retreats the slider 8 relative to the handle body 6, the operation wire 2 advances or retreats.

[0027] The rotating handle 9 is provided on the handle body 6 on the tip side A1 of the slider 8. The rotating handle 9 is rotatable around the longitudinal direction A relative to the handle body 6. The rotating handle 9 is also connected to the operation wire 2 that passes through the internal space of the rotating handle 9. Therefore, when the rotating handle 9 is rotated around the longitudinal direction A relative to the handle body 6, the operation wire 2 rotates around the longitudinal direction A together with the rotating handle 9.

[0028] The surgeon can move the operating wire 2 forward and backward in the longitudinal direction A by moving the slider 8 forward and backward in the longitudinal direction A, and can rotate the operating wire 2 around the longitudinal direction A by rotating the rotating handle 9 around the longitudinal direction A relative to the handle body 6.

[0029] Next, a description will be given of the distal end of the treatment tool 100. At the distal end of the treatment tool 100, the central axes extending in the longitudinal direction A of the sheath 1 and the operation wire 2 coincide with each other, and as shown in Figs. 3, 4, and 5, the central axis of the sheath 1 and the operation wire 2 is referred to as the central axis O1.

[0030] The connecting member 12 is a substantially cylindrical member extending about a central axis O1, and has a base end connected to the tip of the coil sheath. The operation wire 2 is inserted into the internal space of the connecting member 12. The tip of the sheath 1 is located slightly on the tip side A1 from the tip of the coil sheath and is connected to the outer circumferential surface of the connecting member 12. The connecting member 12 may be made of an insulating material.

[0031] The support member 13 is a substantially cylindrical member extending about a central axis O1, and as shown in FIG. 6, has a first support piece 13a and a second support piece 13b extending toward a tip side A1.

[0032] The first support piece 13a and the second support piece 13b are provided in the width direction C on either side of the central axis O1, with the first support piece 13a provided to the left C1 of the central axis O1 and the second support piece 13b provided to the right C2 of the central axis O1. In the width direction C, a support space 13s is formed between the first support piece 13a and the second support piece 13b.

[0033] 3, 4, and 5, a recessed shape that opens to the base end side A2 is provided at the base end of the support member 13. The tip of the connecting member 12 is disposed so as to be surrounded by the inner peripheral surface of this recessed shape.

[0034] Further, the support member 13 is supported by the connecting member 12 so as to be rotatable around the longitudinal direction A relative to the connecting member 12. A connection member 14 connected to the tip of the operation wire 2 is inserted into the internal space of the support member 13 and the support space 13s.

[0035] The connecting member 14 is a substantially cylindrical member extending about the central axis O1, and has flat surfaces (flat surface portions) 14s on the left side C1 and the right side C2, respectively, as shown in Fig. 6. The flat surface portions 14s are provided with protrusions (slide pins) 141 that protrude to the left side C1 and the right side C2. The protrusions 141 may be provided integrally with the connecting member 14, or may be a pin or the like that is a separate part from the connecting member 14.

[0036] The forceps 4 has a first forceps piece 41 and a second forceps piece 42. Fig. 7 is a perspective view showing the forceps piece (first forceps piece) 41.

[0037] The first forceps piece 41 has a first forceps cup (forceps cup) 413 and a first plate portion (plate portion) 414. The first forceps cup 413 is formed in a substantially hemispherical shape and opens toward the second forceps piece 42 side (upward B2) in the opening / closing direction B. The opening edge of the first forceps cup 413 is formed with an uneven shape in the opening / closing direction B when the forceps 4 are in a closed state.

[0038] The first plate portion 414 is provided on the base end side A2 of the first forceps cup 413 and is formed in a substantially plate shape. The first plate portion 414 has a first thick plate portion (thick plate portion) 414a connected to the base end of the first forceps cup 413, and a first thin plate portion (thin plate portion) 414b having a plate thickness in the width direction C smaller than that of the first thick plate portion 414a.

[0039] As shown in Fig. 7, the first thick plate portion 414a is provided with a shaft hole 411 penetrating in the width direction C. Furthermore, the first thin plate portion 414b is provided with a slide groove 412 penetrating in the width direction C. As shown in Fig. 7, the slide groove 412 is a groove having a substantially arc shape. Furthermore, a first abutment portion (abutment portion) 415 which is a flat surface extending in the width direction C is provided at the boundary portion (step portion) between the first thick plate portion 414a and the first thin plate portion 414b.

[0040] The second forceps piece 42 has a shape similar to that of the first forceps piece 41, and is disposed facing the opposite side to the first forceps piece 41 in the opening and closing direction B.

[0041] 6, the tip of the second forceps piece 42 is provided with a second forceps cup (forceps cup) 423 that is formed in a substantially hemispherical shape and opens toward the first forceps piece 41 side (downward B1) in the opening / closing direction B. The opening edge of the second forceps cup 423 is formed with an uneven shape in the opening / closing direction B when the forceps 4 are in a closed state.

[0042] The concave and convex shapes formed on the opening edges of first forceps cup 413 and second forceps cup 423 may have shapes that interlock with each other when forceps 4 is in a closed state, as shown in FIG.

[0043] 6, in the second forceps piece 42, a second plate portion (plate portion) 424 formed in a substantially plate shape is provided at the base end of the second forceps cup 423. Similar to the first plate portion 414, the second plate portion 424 has a second thick plate portion (thick plate portion) 424a connected to the base end of the second forceps cup 423, and a second thin plate portion (thin plate portion) 424b having a plate thickness in the width direction C smaller than that of the second thick plate portion 424a.

[0044] As shown in Figures 3, 4 and 5, the second thick plate portion 424a is provided with a shaft hole 421 penetrating in the width direction C. The second thin plate portion 424b is provided with a slide groove 422 penetrating in the width direction C. The slide groove 422 is a groove having a substantially arc shape. A second abutment portion (abutment portion) 425, which is a flat surface extending in the width direction C, is provided at the boundary portion (step portion) between the second thick plate portion 424a and the second thin plate portion 424b.

[0045] 6, the first forceps piece 41 and the second forceps piece 42 are disposed in the width direction C, with the connecting member 14 sandwiched between the first thin plate portion 414b and the second thin plate portion 424b. The first thick plate portion 414a and the second thick plate portion 424a are disposed adjacent to each other in the width direction C.

[0046] Here, a through hole (not shown) is formed in the first support piece 13a and the second support piece 13b of the support member 13, penetrating in the width direction C. A shaft pin (shaft member) 15 is engaged and attached to the through hole of the first support piece 13a and the second support piece 13b. In addition, the shaft pin 15 is engaged and attached to the shaft hole 411 of the first forceps piece 41 and the shaft hole 421 of the second forceps piece 42, as shown in Figures 3, 4, and 5.

[0047] The pivot pin 15 is a cylindrical rotating shaft member having a central axis extending in the width direction C. The first forceps piece 41 and the second forceps piece 42 are rotatably supported by the first support piece 13a and the second support piece 13b of the support member 13 via the pivot pin 15. The first forceps piece 41 and the second forceps piece 42 are rotatable around the central axis (rotation axis) of the pivot pin 15 as the center of rotation.

[0048] Furthermore, protrusions (slide pins) 141 provided on the left side C1 and right side C2 of the connecting member 14 are inserted into the slide grooves 412, 422 of the first forceps piece 41 and the second forceps piece 42, respectively.

[0049] As shown in Fig. 3, when the forceps 4 is in the closed state, the protrusion 141 is located near the base ends of the slide grooves 412, 422. When the connecting member 14 moves toward the tip side A1 in the forceps 4 in the closed state, the protrusion 141 moves to the vicinity of the middle parts of the slide grooves 412, 422 in the longitudinal direction A, as shown in Fig. 4. Furthermore, when the protrusion 141 moves toward the tip side A1 along the slide grooves 412, 422, the first forceps piece 41 and the second forceps piece 42 rotate about the central axis of the pivot pin 15 as the rotation center and open in the opening / closing direction B, as shown in Fig. 4.

[0050] In the forceps 4 in the half-open state shown in Fig. 4, when the connecting member 14 moves further toward the tip side A1, the protrusion 141 moves to the vicinity of the tips of the slide grooves 412, 422 as shown in Fig. 5. At this time, the first forceps piece 41 and the second forceps piece 42 further rotate about the central axis of the pivot pin 15 as the rotation center, and enter the open state shown in Fig. 5.

[0051] The surgeon can operate the wire operation unit 5 to advance and retract the operation wire 2 in the longitudinal direction A. As the operation wire 2 advances and retracts, the connection member 14 connected to the tip of the operation wire 2 advances and retracts in the longitudinal direction A together with the operation wire 2. Also, by advancing and retracting the connection member 14 to move the position of the protrusion 141 in the longitudinal direction A, the first forceps piece 41 and the second forceps piece 42 can be rotated to open and close the forceps 4. In other words, the surgeon can open and close the forceps 4 by operating the wire operation unit 5 to advance and retract the operation wire 2.

[0052] Moreover, the operation wire 2 and the forceps 4 are connected via a connection member 14. A support member 13 that supports the forceps 4 is supported rotatably about the longitudinal direction A with respect to a connecting member 12 that is connected to the tip of the sheath 1. Therefore, the surgeon can rotate the operation wire 2 and the forceps 4 by rotating the rotating handle 9 about the longitudinal direction A with respect to the handle body 6.

[0053] Here, a procedure (a method of using the endoscopic treatment system 300) using the endoscopic treatment system 300 of this embodiment will be described. Specifically, an incision and dissection treatment of a lesion and a hemostatic treatment in an endoscopic treatment such as ESD (endoscopic submucosal dissection) will be described.

[0054] Incision and dissection procedures often accompany bleeding. If bleeding occurs, the surgeon will perform hemostasis procedures. Hemostasis procedures involve cauterizing the ulcerated area after the lesion has been dissected, or the bleeding area that has bled during incision or dissection procedures, to stop the bleeding.

[0055] In order to place the forceps 4 at an appropriate treatment position, the surgeon rotates the rotating handle 9 to rotate the operation wire 2 and the forceps 4. Even when the rotating handle 9 rotates, the connector 7 attached to the slider 8 does not rotate, so that the A cord (active cord) connected to the connector 7 does not become entangled in the wire operation unit 5.

[0056] The surgeon applies a high-frequency current to the operation wire 2 via the connector 7. The high-frequency current applied to the operation wire 2 is then applied to the forceps 4 via the connection member 14. The surgeon grasps the bleeding site with the forceps 4 through which the high-frequency current is applied, and cauterizes the bleeding site to stop the bleeding.

[0057] The surgeon continues the above-mentioned operations (treatments) as necessary, and finally excises the lesion, completing the ESD procedure.

[0058] Next, a structure for preventing the treatment portion 110 from opening one side will be described. 5, the angle at which the forceps 4 are open in the open state is defined as an opening angle θ1. The opening angle θ1 of the forceps 4 is the sum of a first opening angle θ11, which is the angle at which the first forceps piece 41 is open, and a second opening angle θ12, which is the angle at which the second forceps piece 42 is open, in the forceps 4 in the open state.

[0059] Here, the first opening angle θ11 is the angle formed between the central axis O1 and the first forceps piece 41 in the open state of the forceps 4. Moreover, the second opening angle θ12 is the angle formed between the central axis O1 and the second forceps piece 42 in the open state of the forceps 4. The opening angle θ1 of the forceps 4 is the angle formed between the first forceps piece 41 and the second forceps piece 42.

[0060] Fig. 8 is a side view showing forceps piece (first forceps piece) 41. Fig. 9 is a cross-sectional view showing forceps pieces 41, 42 and connecting member 14 in the forceps 4 in an open state.

[0061] 8, the direction in which the first forceps piece 41 (and the second forceps piece 42) of the forceps 4 in the closed state extends is defined as a central axis (axial direction) O2. The central axis O2 is the central axis of the forceps 4 in the closed state, and is an axis passing through the center of rotation of the forceps 4. In other words, the central axis O2 is an axis passing through the central axis (rotation axis) of the pivot pin 15. In this embodiment, the central axis O2 of the forceps 4 coincides with the central axis O1 of the treatment tool 100.

[0062] 8, the angle formed between the central axis O2 of the first forceps piece 41 and the first abutment portion (abutment portion) 415 is referred to as the abutment portion angle θ2. The angle formed between the central axis O2 of the first forceps piece 41 and the first abutment portion 415 is substantially equal to the angle formed between the central axis O2 of the second forceps piece 42 and the second abutment portion 425. Therefore, the angle formed between the central axis O2 of the forceps pieces 41, 42 and the abutment portions 415, 425 is referred to as the abutment portion angle θ2.

[0063] 9, in the treatment section 110 in the open state, the tip portion 142 of the connecting member 14 and the contact portions 415, 425 are in contact with each other facing each other in the longitudinal direction A. Therefore, in the treatment section 110 in the open state, the posture of the connecting member 14 is restricted by the contact portions 415, 425, and a state in which the central axis of the connecting member 14 and the central axis O2 of the forceps 4 are approximately aligned is maintained.

[0064] For example, when the distal end of the connecting member does not come into contact with the abutting portion of the forceps in the open treatment section, the connecting member may assume a position in which the central axis of the connecting member is shifted from the central axis of the forceps. In that case, the opening angle of the first forceps piece (first opening angle) and the opening angle of the second forceps piece (second opening angle) may differ, and one-sided opening may occur.

[0065] In the treatment section 110 in the open state, the distal end portion 142 of the connection member 14 abuts against the abutting portions 415 and 425, thereby preventing the central axis of the connection member 14 from shifting from the central axis O2 of the forceps 4, and preventing the occurrence of one-sided opening. Specifically, when the connection member 14 is advanced to the distal end side A1 to the maximum extent, the distal end portion 142 of the connection member 14 is pressed against the abutting portions 415 and 425, preventing the central axis of the connection member 14 from shifting from the central axis O2 of the forceps 4 and preventing the one-sided opening. In other words, by pressing the distal end portion 142 of the connection member 14 against the abutting portions 415 and 425, the treatment section 110 is forced into an open state at a predetermined angle. This prevents the forceps 4 from opening one-sided, and improves the operability of the endoscopic treatment tool 100 when performing hemostasis treatment.

[0066] When the forceps 4 are in an open state, it is preferable that the flat surfaces of the tip portion 142 of the connecting member 14 and the abutting portions 415, 425 abut against each other in the longitudinal direction A.

[0067] In the first forceps piece 41, a position where it is opened to the first opening angle θ11 is referred to as a first forceps fixing position (forceps fixing position). In addition, in the second forceps piece 42, a position where it is opened to the second opening angle θ12 is referred to as a second forceps fixing position (forceps fixing position).

[0068] When the tip 142 of the connecting member 14 abuts against the abutment portions 415, 425, the first forceps piece 41 is fixed at the first forceps fixing position, and the second forceps piece 42 is fixed at the second forceps fixing position. The first forceps fixing position and the second forceps fixing position are predetermined positions that have been set in advance. In addition, the first opening angle θ11 and the second opening angle θ12 are predetermined angles that have been set in advance. In other words, the opening angle θ1 of the forceps 4 is a predetermined angle that has been set in advance.

[0069] By bringing the tip portion 142 of the connecting member 14 into contact with the contact portions 415, 425, the surgeon can easily fix the first forceps piece 41 and the second forceps piece 42 in a predetermined position (forceps fixing position) when opening the forceps 4. Note that the first opening angle θ11 and the second opening angle θ12 are preferably equal angles, but may be different angles.

[0070] As shown in FIG. 9, when the treatment section 110 is in an open state, the contact portions 415, 425 of the forceps 4 are located in the longitudinal direction A between the pivot pin 15 serving as the rotation axis of the forceps 4 and the slide grooves 412, 422 of the forceps 4.

[0071] 9 is the distance (dimension) in the longitudinal direction A between the contact parts 415, 425 of the forceps 4 and the protrusion 141 of the connection member 14 in the open treatment section 110. The dimension L2 is the distance (dimension) in the longitudinal direction A between the contact parts 415, 425 of the forceps 4 and the tips of the slide grooves 412, 422 in the open treatment section 110. The dimension L3 is the distance (dimension) in the longitudinal direction A between the protrusion 141 of the connection member 14 and the tips of the slide grooves 412, 422 in the open treatment section 110.

[0072] Here, in the treatment section 110 in the open state, a gap is maintained between the protrusion 141 of the connection member 14 and the tips of the slide grooves 412, 422. That is, the dimension L3 is greater than 0 mm, and the protrusion 141 of the connection member 14 and the tips of the slide grooves 412, 422 do not come into contact with each other.

[0073] Furthermore, the dimension L1 (the distance from the contact portions 415, 425 to the protrusion 141) is greater than the dimension L2 (the distance from the contact portions 415, 425 to the tips of the slide grooves 412, 422).

[0074] By setting the dimensions L1, L2, and L3 as described above, when the treatment section 110 is in the open state, the movement of the protrusion portion 141 toward the tip side A1 is not hindered by the tips of the slide grooves 412, 422, and the tip portion 142 of the connecting member 14 can be reliably abutted against the abutment portions 415, 425.

[0075] When the treatment section 110 is opened, it is preferable that the contact portion 415 of the first forceps piece 41 and the contact portion 425 of the second forceps piece 42 contact the tip portion 142 of the connecting member 14 simultaneously.

[0076] Furthermore, it is preferable that the above-mentioned opening angle θ1 and the contact portion angle θ2 have a relationship of θ2=90°-θ1 / 2.By doing so, when the forceps 4 is opened and the tip portion 142 of the connecting member 14 comes into contact with the contact portions 415, 425, the first opening angle θ11 and the second opening angle θ12 become equal angles, and the first forceps piece 41 and the second forceps piece 42 can be opened evenly.

[0077] The endoscopic treatment tool 100 according to this embodiment includes a sheath 1, a manipulation wire (wire) 2 inserted through the sheath 1 and movable forward and backward in a longitudinal direction A of the sheath 1, a connecting member 14 connected to a distal end of the manipulation wire 2, and forceps 4 having a first forceps piece 41 and a second forceps piece 42 that can be opened and closed relative to each other by the forward and backward movement of the manipulation wire 2, and connected via the connecting member 14. In addition, the first forceps piece 41 and the second forceps piece 42 have abutment portions 415, 425 that abut against the distal end portion 142 of the connecting member 14 in the longitudinal direction A when the forceps 4 is in an open state.

[0078] As a result, the central axis of the connecting member 14 is prevented from being misaligned with the central axis O2 of the forceps 4, and the occurrence of one-sided opening can be prevented.

[0079] 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 design modifications and the like that do not depart from the gist of the present invention are also included. Also, the components shown in the above embodiment and modified examples can be appropriately combined to form a configuration.

[0080] (Variation 1) In the above embodiment, the treatment section 110 is a hemostatic forceps that cauterizes the affected area to stop bleeding, but the type of the treatment section is not limited to this. The treatment section may be a biopsy forceps that collects biological tissue.

[0081] (Variation 2) In the above embodiment, the tip 142 of the connecting member 14 and the abutment portions 415, 425 of the forceps 4 each have a flat surface, and the flat surfaces abut against each other when the treatment section 110 is in the open state, but the tip of the connecting member and the abutment portions of the forceps are not limited to this.

[0082] The tip of the connecting member and the contact part of the forceps may have any shape as long as they come into contact when the treatment unit is in the open state and can prevent the forceps from opening one-sidedly, and for example, the tip of the connecting member and the contact part of the forceps may have an uneven shape. Also, one of the tip of the connecting member and the contact part of the forceps may be a flat surface and the other may be a surface having an uneven shape. [Explanation of symbols]

[0083] 300 Endoscopic treatment system 200 Endoscope 100 Endoscopic treatment tools (treatment tools) 110 Treatment department 5 Wire operation unit 9 Rotating Handle 1 Sheath 2 Operation wire (wire) 4. Forceps (jaws) 41 First forceps piece (forceps piece) 412, 422 Slide groove 415 First contact part (contact part) 42 Second forceps piece (forceps piece) 425 Second contact part (contact part) 12 Connecting members 13 Support member (cover member) 14 Connection parts 141 Protrusion (slide pin) 142 Tip of connecting member 15 Axle pin (shaft member) θ1 Forceps opening angle θ11 Opening angle of the first forceps θ12 Opening angle of the second forceps θ2 Contact angle L1 Distance from the contact part to the protrusion L2 Distance from the contact part to the end of the slide groove L3 Distance from the protrusion of the connecting member to the end of the slide groove A Longitudinal direction B Opening and closing direction C Width direction O1 center axis O2 Forceps central axis (axial direction)

Claims

1. A sheath, A wire that is inserted through the sheath and can be advanced and retracted in a longitudinal direction of the sheath; A connection member connected to a tip end of the wire; a pair of forceps including a first forceps piece and a second forceps piece that can be opened and closed by the advancement and retreat of the wire, the forceps being connected via the connecting member; Equipped with the first forceps piece and the second forceps piece have an abutment portion that abuts against a tip end of the connection member in the longitudinal direction when the forceps are in an open state; Endoscopic treatment tools.

2. When the distal end portion of the connection member is pressed against the abutment portion of the first forceps piece, the first forceps piece is fixed at a first forceps fixing position where the first forceps piece is opened to a preset opening angle. The endoscopic treatment tool according to claim 1 .

3. When the distal end portion of the connection member is pressed against the abutment portion of the second forceps piece, the second forceps piece is fixed at a second forceps fixing position where the second forceps piece is opened to a preset opening angle. The endoscopic treatment tool according to claim 2 .

4. a tip end of the connecting member having a flat surface that comes into contact with the contact portion when the forceps are in an open state; The contact portion has a flat surface that contacts the tip end of the connecting member when the forceps are in an open state. The endoscopic treatment tool according to claim 1 .

5. When the forceps are in an open state, a central axis of the connecting member and a central axis of the forceps are substantially aligned with each other. The endoscopic treatment tool according to claim 1 .

6. The connection member has a protrusion protruding in a width direction, the first forceps piece and the second forceps piece have slide grooves into which the protrusions are inserted, The forceps are opened and closed by the protrusion moving along the slide groove. The endoscopic treatment tool according to claim 1 .

7. When the forceps are in an open state, the abutment portion is located between a rotation axis of the forceps and the slide groove in the longitudinal direction. The endoscopic treatment tool according to claim 6.

8. The protrusion and the tip of the slide groove are arranged so as not to come into contact with each other in the longitudinal direction when the forceps are in an open state. The endoscopic treatment tool according to claim 6.

9. When the forceps are changed from an open state to a closed state, the protrusion portion moves toward the base end side in the longitudinal direction. The endoscopic treatment tool according to claim 6.

10. When the forceps are changed from a closed state to an open state, a first contact portion that is the contact portion of the first forceps piece and a second contact portion that is the contact portion of the second forceps piece substantially simultaneously contact a tip portion of the connecting member. The endoscopic treatment tool according to claim 1 .

11. When the forceps are in an open state, an opening angle of the first forceps piece relative to a central axis of the forceps and an opening angle of the second forceps piece relative to the central axis of the forceps are substantially equal to each other. The endoscopic treatment tool according to claim 1 .

12. When the open angle of the forceps in the open state is θ1, and when the forceps in the closed state is an abutment angle that is an angle between the abutment portion and a central axis of the forceps, the open angle and the abutment angle satisfy the relationship θ2=90°−θ1 / 2. The endoscopic treatment tool according to claim 1 .

13. The wire manipulation unit is connected to a proximal end of the wire and is capable of advancing and retracting the wire. The endoscopic treatment tool according to claim 1 .

14. the wire operation unit has a connector connected to the wire, The connector is capable of supplying high frequency current to the forceps via the wire. The endoscopic treatment tool according to claim 13.

15. The first forceps piece and the second forceps piece each have a thick plate portion and a thin plate portion, The plane that is the abutment portion is provided at a step portion that is a boundary portion between the thick plate portion and the thin plate portion. The endoscopic treatment tool according to claim 4.

16. The protrusion portion is located on a proximal end side of a tip end portion of the connection member that abuts against the abutment portion in the longitudinal direction. The endoscopic treatment tool according to claim 6.

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