Treatment instrument

Abstract

This treatment instrument comprises: a sheath; a center shaft that extends in a width direction orthogonally intersecting the length direction of the sheath; and forceps that have a first forceps piece and a second forceps piece, at least one of said first forceps piece and said second forceps piece being supported so as to be able to open and close treating the center shaft as the center, wherein the lengths of the first forceps piece and the second forceps piece in the aforementioned width direction are greater than or equal to the lengths of the first forceps piece and the second forceps piece in the aforementioned length direction.

Description

Treatment tools

[0001] This application claims priority to U.S. Provisional Application No. 63 / 373,192, filed in the United States on August 22, 2022, the contents of which are incorporated herein by reference.

[0002] Conventionally, hemostatic forceps (treatment tools) have been used in endoscopic treatment to cauterize a bleeding treatment target to stop the bleeding. The hemostatic forceps described in Patent Document 1 and the like grasps the treatment target with openable and closable forceps pieces, and stops the bleeding of the treatment target with the forceps pieces to which high-frequency current is applied.

[0003] Patent No. 4668525

[0004] However, the conventional hemostatic forceps (treatment tool) described in Patent Document 1 and elsewhere has a vertically long cup shape, which means that the forceps blades push the biological tissue distally, making it difficult to grasp the biological tissue with just the tips of the forceps blades. As a result, there is a risk that the surgeon will not be able to grasp the biological tissue as intended.

[0005] In view of the above circumstances, an object of the present invention is to provide a treatment tool that can easily grasp living tissue as a treatment target.

[0006] In order to solve the above problems, the present invention proposes the following means: A treatment instrument according to a first aspect of the present invention includes a sheath, a rotation axis extending in a width direction perpendicular to the longitudinal direction of the sheath, and forceps having first and second forceps pieces, at least one of the first and second forceps pieces being supported so as to be openable and closable about the rotation axis, wherein the widthwise lengths of the first and second forceps pieces are equal to or greater than the longitudinal lengths of the first and second forceps pieces.

[0007] According to the treatment tool of the present invention, it is easy to grasp the living tissue of the treatment target.

[0008] 1 is an overall view of an endoscopic treatment system according to a first embodiment. FIG. 1 is an overall view showing a treatment tool of the endoscopic treatment system. FIG. 2 is a perspective view of a tip portion of the treatment tool with the forceps in a closed state. FIG. 3 is a perspective view of a tip portion of the treatment tool with the forceps in a closed state. FIG. 4 is a perspective view of a tip portion of the treatment tool with the forceps in an open state. FIG. 5 is a perspective view of a frame of a support member of the treatment tool. FIG. 6 is a front view of the treatment tool with the forceps in a closed state. FIG. 7 is a left side view of the treatment tool with the forceps in a closed state. FIG. 8 is a left sectional view of the treatment tool with the forceps in a closed state. FIG. 9 is a plan view of the treatment tool with the forceps in a closed state. FIG. 10 is a bottom view of the treatment tool with the forceps in a closed state. FIG. 11 is a right side view of the treatment tool with the forceps in a closed state. FIG. 12 is a right sectional view of the treatment tool with the forceps in a closed state. FIG. 13 is a front view of the treatment tool with the forceps in an open state. FIG. 14 is a left side view of the treatment tool with the forceps in an open state. FIG. 15 is a left sectional view of the treatment tool with the forceps in an open state. 10 is a plan view of the treatment tool with the forceps in a closed state. FIG. 11 is a bottom view of the treatment tool with the forceps in a closed state. FIG. 12 is a right side view of the treatment tool with the forceps in an open state. FIG. 13 is a right sectional view of the treatment tool with the forceps in an open state. FIG. 14 is a rear view of the distal end of the treatment tool. FIG. 15 is a perspective view of the treatment tool according to a second embodiment when the forceps are in a closed state. FIG. 16 is a perspective view of the distal end of the treatment tool with the forceps in a closed state. FIG. 17 is a perspective view of the distal end of the treatment tool with the forceps in an open state. FIG. 18 is a left side view of the distal end of the treatment tool with the forceps in a closed state. FIG. 19 is a right side view of the distal end of the treatment tool with the forceps in a closed state. FIG. 19 is a plan view of the treatment tool with the forceps in a closed state. FIG. 19 is a bottom view of the distal end of the treatment tool with the forceps in a closed state. FIG. 19 is a front view of the distal end of the treatment tool with the forceps in a closed state. FIG. 19 is a rear view of the distal end of the treatment tool. FIG. 19 is a perspective view of the treatment tool according to a third embodiment when the treatment tool is in a closed state. FIG. 19 is a perspective view of the distal end of the treatment tool with the forceps in a closed state. FIG. 1 is a perspective view of the distal end portion of the treatment tool with the forceps in an open state. FIG. 2 is a perspective view of the distal end portion of the treatment tool with the forceps in an open state. FIG. 3 is a left side view of the distal end portion of the treatment tool with the forceps in a closed state. FIG. 4 is a right side view of the distal end portion of the treatment tool with the forceps in a closed state. FIG. 5 is a plan view of the distal end portion of the treatment tool with the forceps in a closed state. FIG. 6 is a bottom view of the distal end portion of the treatment tool with the forceps in a closed state. FIG. 7 is a front view of the distal end portion of the treatment tool with the forceps in a closed state. FIG. 8 is a rear view of the distal end portion of the treatment tool.10 is a perspective view of the distal end portion of a treatment tool according to a fourth embodiment when the treatment tool is in a closed state. FIG. 11 is a perspective view of the distal end portion of the treatment tool when the forceps are in a closed state. FIG. 12 is a perspective view of the distal end portion of the treatment tool when the forceps are in an open state. FIG. 13 is a perspective view of the distal end portion of the treatment tool when the forceps are in an open state. FIG. 14 is a left side view of the distal end portion of the treatment tool when the forceps are in a closed state. FIG. 15 is a right side view of the distal end portion of the treatment tool when the forceps are in a closed state. FIG. 16 is a plan view of the distal end portion of the treatment tool when the forceps are in a closed state. FIG. 17 is a bottom view of the distal end portion of the treatment tool when the forceps are in a closed state. FIG. 18 is a front view of the distal end portion of the treatment tool when the forceps are in a closed state. FIG. 19 is a rear view of the distal end portion of the treatment tool according to a fifth embodiment when the treatment tool is in a closed state. FIG. 19 is a perspective view of the distal end portion of the treatment tool when the forceps are in a closed state. FIG. 19 is a perspective view of the distal end portion of the treatment tool when the forceps are in an open state. FIG. 19 is a left side view of the distal end portion of the treatment tool when the forceps are in a closed state. FIG. 19 is a right side view of the treatment tool when the forceps are in a closed state. 10 is a plan view of the treatment tool with the forceps in a closed state. FIG. 11 is a bottom view of the treatment tool with the forceps in a closed state. FIG. 12 is a front view of the treatment tool with the forceps in a closed state. FIG. 13 is a rear view of the distal end of the treatment tool. FIG. 14 is a perspective view of the treatment tool according to a sixth embodiment when it is in a closed state. FIG. 15 is a perspective view of the distal end of the treatment tool with the forceps in a closed state. FIG. 16 is a perspective view of the distal end of the treatment tool with the forceps in an open state. FIG. 17 is a left side view of the distal end of the treatment tool with the forceps in a closed state. FIG. 18 is a right side view of the distal end of the treatment tool with the forceps in a closed state. FIG. 19 is a plan view of the distal end of the treatment tool with the forceps in a closed state. FIG. 19 is a bottom view of the distal end of the treatment tool with the forceps in a closed state. FIG. 19 is a front view of the distal end of the treatment tool with the forceps in a closed state. FIG. 19 is a rear view of the distal end of the treatment tool. FIG. 19 is a perspective view of the treatment tool according to a seventh embodiment when it is in a closed state. FIG. 19 is a perspective view of the distal end of the treatment tool with the forceps in a closed state. FIG. 19 is a perspective view of the distal end of the treatment tool with the forceps in an open state. FIG. 1 is a perspective view of the distal end portion of the treatment tool with the forceps in an open state. FIG. 2 is a left side view of the distal end portion of the treatment tool with the forceps in a closed state. FIG. 3 is a right side view of the distal end portion of the treatment tool with the forceps in a closed state. FIG. 4 is a plan view of the distal end portion of the treatment tool with the forceps in a closed state. FIG. 5 is a bottom view of the distal end portion of the treatment tool with the forceps in a closed state. FIG. 6 is a front view of the distal end portion of the treatment tool with the forceps in a closed state. FIG. 7 is a rear view of the distal end portion of the treatment tool with the forceps in a closed state.10 is a perspective view of a treatment tool according to an eighth embodiment when the treatment tool is in a closed state. FIG. 11 is a perspective view of the distal end portion of the treatment tool with the forceps in a closed state. FIG. 12 is a perspective view of the distal end portion of the treatment tool with the forceps in an open state. FIG. 13 is a perspective view of the distal end portion of the treatment tool with the forceps in an open state. FIG. 14 is a left side view of the distal end portion of the treatment tool with the forceps in a closed state. FIG. 15 is a right side view of the distal end portion of the treatment tool with the forceps in a closed state. FIG. 16 is a plan view of the distal end portion of the treatment tool with the forceps in a closed state. FIG. 17 is a bottom view of the distal end portion of the treatment tool with the forceps in a closed state. FIG. 18 is a front view of the distal end portion of the treatment tool with the forceps in a closed state. FIG. 19 is a rear view of the distal end portion of the treatment tool. FIG. 19 is a perspective view of a treatment tool according to a ninth embodiment when the forceps are in a closed state. FIG. 19 is a perspective view of the distal end portion of the treatment tool with the forceps in a closed state. FIG. 19 is a perspective view of the distal end portion of the treatment tool with the forceps in an open state. FIG. 19 is a left side view of the distal end portion of the treatment tool with the forceps in a closed state. FIG. 19 is a right side view of the distal end portion of the treatment tool with the forceps in a closed state. 10 is a plan view of the distal end portion of the treatment tool with the forceps in a closed state. FIG. 11 is a bottom view of the distal end portion of the treatment tool with the forceps in a closed state. FIG. 12 is a front view of the distal end portion of the treatment tool with the forceps in a closed state. FIG. 13 is a rear view of the distal end portion of the treatment tool. FIG. 14 is a perspective view of the forceps of the treatment tool according to a tenth embodiment when they are in a closed state. FIG. 15 is a perspective view of the distal end portion of the treatment tool with the forceps in a closed state. FIG. 16 is a perspective view of the distal end portion of the treatment tool with the forceps in an open state. FIG. 17 is a left side view of the distal end portion of the treatment tool with the forceps in a closed state. FIG. 18 is a right side view of the distal end portion of the treatment tool with the forceps in a closed state. FIG. 19 is a plan view of the distal end portion of the treatment tool with the forceps in a closed state. FIG. 19 is a bottom view of the distal end portion of the treatment tool with the forceps in a closed state. FIG. 19 is a front view of the distal end portion of the treatment tool with the forceps in a closed state. FIG. 19 is a rear view of the distal end portion of the treatment tool. FIG. 19 is a diagram showing an example of a usage mode of the treatment tool.

[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 Figures 1 to 22. Figure 1 is an overall view of the endoscopic treatment system 300.

[0010] 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 for use.

[0011] [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 operation section 220 attached to the base end of the insertion section 210, and a universal cord 230 attached to the operation section 220.

[0012] The insertion section 210 is a thin, elongated 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.

[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 response to the user's operation of the operation 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 supported by a user. The input section 222 accepts 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] 2, 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, a manipulation wire 2 (see FIG. 10), a support member 3, forceps (jaws) 5, and an operation unit 8. In the following description, in the longitudinal 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 8 will be referred to as the "base side (proximal side) A2."

[0017] 3 to 6, a support member 3 and forceps 5 are provided at the distal end of the treatment tool 100. The forceps 5 is supported by the support member 3. The forceps 5 is supported by the support member 3 so as to be openable and closable. The support member 3 and the forceps 5 constitute a "treatment section 110" that treats the affected area.

[0018] In the following description, the direction in which the forceps 5 open and close is referred to as the "opening / closing direction B" or the "up-down direction B." Furthermore, the direction perpendicular to the longitudinal direction A and the opening / closing direction B is referred to as the "width direction C" or the "left-right direction C." Furthermore, a plane parallel to the longitudinal direction A and the width direction C is referred to as the "horizontal plane HP." A plane parallel to the longitudinal direction A and the opening / closing direction B is referred to as the "vertical plane VP."

[0019] [Sheath 1] The sheath 1 is a flexible, long member extending 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. 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 sheath 1 may be insulating.

[0020] [Operation Wire 2] The operation wire 2 is a metal wire that is inserted through the internal space 1s of the sheath 1 (see FIG. 10). The distal end of the operation wire 2 is connected to a link mechanism 37 of the support member 3, and the proximal end of the operation wire 2 is connected to the operation unit 8. Note that the link mechanism 37 is not limited to the configuration shown in FIG. 10.

[0021] [Support Member 3] As shown in Fig. 2, the support member 3 is attached to the distal end 1a of the sheath 1 and supports the forceps 5. As shown in Figs. 3 to 6, the support member 3 includes a frame 31, a pin (rotation shaft, rotation shaft member) 36, a link mechanism 37, and a connecting portion 39. The first forceps blade 6 and the second forceps blade 7 of the forceps 5 are supported by the support member 3 by the pin 36 attached to the frame 31 so as to be able to open and close.

[0022] 7 is a perspective view of the frame 31 of the support member 3. The frame 31 is made of a metal such as stainless steel and has a generally U-shape. The frame 31 has a support body 32 formed in a cylindrical shape and a pair of frame pieces 33 (a first frame piece 34 and a second frame piece 35).

[0023] As shown in Fig. 10 and other figures, the support portion main body 32 is attached to the distal end 1a of the sheath 1 by clearance fit or the like using a joint portion 41 attached to the distal end 1a of the sheath 1. The support portion main body 32 is rotatably supported with respect to the joint portion 41, i.e., the distal end 1a of the sheath 1. The central axis O3 in the longitudinal direction A of the support member 3 substantially coincides with the central axis O1 in the longitudinal direction A of the sheath 1. The internal space 3s of the support portion main body 32 communicates with the internal space 1s of the sheath 1 (Fig. 10).

[0024] As shown in Figure 5, a pair of frame pieces 33 (first frame piece 34 and second frame piece 35) are provided to protrude from the support portion main body 32 toward the tip side A1. The first frame piece 34 and the second frame piece 35 are provided evenly on both sides of the central axis O3 in the width direction C. The first frame piece 34 and the second frame piece 35 are symmetrical with respect to a vertical plane VP that passes through the central axis O3.

[0025] The first frame piece 34 is formed in a flat plate shape extending in the longitudinal direction A. The plate thickness direction of the first frame piece 34 substantially coincides with the width direction C. The base end side A2 of the first frame piece 34 is continuous with the support portion main body 32. A semicircular first tip portion 34a is formed on the tip side A1 of the first frame piece 34. A first through hole 34h that penetrates in the width direction C is formed on the tip side A1 of the first frame piece 34.

[0026] The second frame piece 35 is formed in a flat plate shape extending in the longitudinal direction A. The plate thickness direction of the second frame piece 35 substantially coincides with the width direction C. The base end side A2 of the second frame piece 35 is continuous with the support portion main body 32. A semicircular second tip portion 35a is formed on the tip side A1 of the second frame piece 35. A second through hole 35h that penetrates in the width direction C is formed on the tip side A1 of the second frame piece 35.

[0027] 3 and 4 is made of a metal such as stainless steel and has a generally cylindrical shape. As shown in FIG. 5, the pin 36 is inserted into the first through-hole 34h and the second through-hole 35h and engages with them to be attached to the frame 31.

[0028] The link mechanism 37 is a link mechanism that converts the forward and backward movement of the manipulating wire 2 in the longitudinal direction A shown in Figures 10 and 14 into the opening and closing movement of the forceps 5 as shown in Figures 3 to 6. As shown in Figures 10 and 14, the link mechanism 37 has a rod 37a, a first link 37b, and a second link 37c.

[0029] The rod 37a is formed in a cylindrical shape and is inserted into the internal space 3s of the support portion main body 32. The rod 37a is movable forward and backward along the longitudinal direction A. The tip of the operating wire 2 is attached to the base end side A2 of the rod 37a.

[0030] The first link 37b is a plate-shaped member that connects the rod 37a and the first forceps blade 6 of the forceps 5. The first link 37b is connected to the rod 37a so as to be rotatable along a plane VP perpendicular to the rod 37a. The first link 37b is also connected to the first forceps blade 6 so as to be rotatable along a plane VP perpendicular to the first forceps blade 6.

[0031] The second link 37c is a plate-shaped member that connects the rod 37a and the second forceps blade 7 of the forceps 5. The second link 37c is connected to the rod 37a so as to be rotatable along a plane VP perpendicular to the rod 37a. The second link 37c is also connected to the second forceps blade 7 so as to be rotatable along a plane VP perpendicular to the second forceps blade 7.

[0032] The operating wire 2 may be directly connected to the base end side of the connecting portion 39 or may be connected via a connecting member (not shown).

[0033] [Forceps (jaw) 5] The forceps (jaw) 5 is a member for grasping biological tissue. As shown in Figures 3 and 4 , the forceps 5 is supported by a support member 3 so as to be able to open and close toward the distal end side A1. The forceps 5 is formed of a metal material such as stainless steel, and includes a first forceps piece 6 and a second forceps piece 7.

[0034] The first forceps piece 6 is supported by a pin 36 so as to be rotatable about a central axis R of the pin 36, which extends in a width direction perpendicular to the longitudinal direction of the sheath 1. The first forceps piece 6 is operated by a first link 37b connected to the base end side A2 of the first forceps piece 6.

[0035] The second forceps blade 7 is supported by the pin 36 so as to be rotatable about the central axis R of the pin 36. The second forceps blade 7 is operated by a second link 37c connected to the base end side A2 of the second forceps blade 7.

[0036] The first forceps blade 6 and the second forceps blade 7 are arranged symmetrically with respect to a central axis O5 in the longitudinal direction A of the forceps 5 (see FIGS. 8 and 9). The central axis O5 in the longitudinal direction A of the forceps 5 substantially coincides with the central axis O1 in the longitudinal direction A of the sheath 1.

[0037] One of the first forceps blade 6 and the second forceps blade 7 may be fixed to the support member 3, and the other may be rotatably supported by the support member 3. Furthermore, the forceps 5 may be directly operated by an operating wire instead of by the link mechanism 37.

[0038] In the following description, the direction in which the first forceps blade 6 opens will be referred to as the "lower side B1" in the opening / closing direction B, and the direction in which the second forceps blade 7 opens will be referred to as the "upper side B2" in the opening / closing direction B. In addition, the direction facing right when looking from the distal end side A1 to the proximal end side A2 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.

[0039] [First Forceps Blade 6] As shown in FIGS. 4, 9, and 10, the first forceps blade 6 has a first gripping portion 61 provided on the distal end side A1, and a first plate 63.

[0040] The first gripping portion 61 has a lower side B1 formed in a semi-ellipsoid shape (see FIG. 8), and an upper side B2 having a first gripping surface 64 for gripping biological tissue.

[0041] The first plate 63 is provided on the base end side A2 of the first gripping portion 61 and is formed in a generally plate shape as shown in Fig. 10. The thickness direction of the first plate 63 generally coincides with the width direction C. As shown in Figs. 11 and 12, the first plate 63 is disposed adjacent to the second plate 73 of the second forceps blade 7 on the right side C1.

[0042] 4, 9, and 10, the first plate 63 is supported by the pin 36 so as to be rotatable about the central axis R of the pin 36. In addition, the base end of the first plate 63 is rotatably connected to the tip end of the first link 37b.

[0043] [Second Forceps Blade 7] As shown in FIGS. 5, 13, and 14, the second forceps blade 7 has a second gripping portion 71 provided on the distal end side A1, and a second plate 73.

[0044] The second gripping portion 71 has an upper side B2 formed in a semi-ellipsoid shape (see FIG. 8), and has a second gripping surface 74 on a lower side B1 for gripping biological tissue.

[0045] The second plate 73 is provided on the base end side A2 of the second gripping portion 71 and is formed in a generally plate shape as shown in Fig. 16. The thickness direction of the second plate 73 generally coincides with the width direction C. As shown in Figs. 13 and 14, the second plate 73 is disposed adjacent to the first plate 63 of the first forceps piece 6 on the left side C2.

[0046] 14, the second plate 73 is supported by the pin 36 so as to be rotatable about the central axis R of the pin 36. In addition, the base end of the second plate 73 is rotatably connected to the tip end of the second link 37c.

[0047] 9 and 10 , the first gripping surface 64 and the second gripping surface 74 are surfaces that face each other when the forceps 5 is in a closed state, and at least a portion of the surfaces come into contact with each other on a horizontal plane HP (hereinafter also referred to as the "gripping surface GP") that passes through the central axis O5 of the forceps 5. The first gripping surface 64 and the second gripping surface 74 are formed in a symmetrical shape with respect to the gripping surface GP.

[0048] The first gripping surface 64 is an uneven surface, and as shown in FIG. 9 , has a first contact protrusion 65 that comes into contact with the second gripping surface 74 of the second forceps piece 7 when the forceps 5 is in the closed state, and a first accommodating recess 66 that does not come into contact with the second gripping surface 74 when the forceps 5 is in the closed state.

[0049] 9 , the first contact protrusion 65 is provided at the tip of the first gripping surface 64. The first contact protrusion 65 is formed in a generally flat shape extending in the width direction C along the gripping surface GP. When the forceps 5 is in the closed state, the first contact protrusion 65 comes into contact with the second contact protrusion 75 of the second gripping surface 74 that faces it in the opening / closing direction B.

[0050] 9 , the first accommodating recess 66 is a recess recessed from the gripping surface GP to the lower side B1 when the forceps 5 is in the closed state, and is provided on the base end side of the first contact protrusion 65. The first accommodating recess 66 is formed in a substantially flat shape on the lower side B1 than the gripping surface GP. The first accommodating recess 66 curves toward the upper side B2 at its tip end and smoothly connects to the base end side of the first contact protrusion 65.

[0051] The second gripping surface 74 is an uneven surface, and as shown in FIG. 9 , has a second contact protrusion 75 that comes into contact with the first gripping surface 64 of the first forceps piece 6 when the forceps 5 is in the closed state, and a second accommodating recess 76 that does not come into contact with the first gripping surface 64 when the forceps 5 is in the closed state.

[0052] 9 , the second contact protrusion 75 is provided at the tip of the second gripping surface 74. The second contact protrusion 75 is formed in a generally flat shape extending in the width direction C along the gripping surface GP. When the forceps 5 is in the closed state, the second contact protrusion 75 comes into contact with the first contact protrusion 65 of the first gripping surface 64 that faces it in the opening / closing direction B.

[0053] 9 , the second accommodating recess 76 is a recess recessed from the gripping surface GP to the upper side B2 when the forceps 5 is in the closed state, and is provided on the proximal end side of the second contact protrusion 75. The second accommodating recess 76 is formed in a substantially flat shape.

[0054] 9 , when the forceps 5 are in the closed state, only the first contact protrusion 65 and the second contact protrusion 75 are in contact with each other. Therefore, the distance between the first gripping surface 64 of the first forceps blade 6 and the second gripping surface 74 of the second forceps blade 7 is longer on the base end side than on the tip end side in the longitudinal direction A.

[0055] In this embodiment, the maximum length L1 ( FIG. 8 ) in the width direction C of the forceps 5 (first forceps blade 6 and second forceps blade 7) is within a range of 1.0 to 1.6 times, and 1.1 times is particularly preferred, the length L2 ( FIG. 9 ) in the longitudinal direction A of the forceps 5. Furthermore, the maximum length L1 in the width direction C of the forceps 5 (first forceps blade 6 and second forceps blade 7) is equal to or less than the maximum outer diameter of the sheath 1.

[0056] In this embodiment, the maximum reopening width W (FIG. 16) of the forceps 5 is within a range of 1.7 to 2.8 times the length L2 (FIG. 9) of the forceps 5 in the longitudinal direction A, with 2.0 times being particularly preferred.

[0057] In this embodiment, the length T of the forceps 5 in the thickness direction B perpendicular to the longitudinal direction A when the forceps 5 is closed is in the range of 0.2 to 0.6 times the length L2 of the forceps 5 in the longitudinal direction A, with 0.3 times being particularly preferred.

[0058] Furthermore, the length L1 (FIG. 8) of the forceps 5 (first forceps blade 6 and second forceps blade 7) in the width direction C is smaller than the outer diameter of the sheath 1.

[0059] 2, the operation unit 8 is provided on the proximal end side A2 of the sheath 1. The operation unit 8 has an operation unit main body 81, a slider 82, and a power supply connector 83.

[0060] The distal end of the operation unit main body 81 is connected to the proximal end 1b of the sheath 1. The operation unit main body 81 has an internal space through which the operation wire 2 can be inserted. The operation wire 2 passes through the internal space of the sheath 1 and the internal space of the operation unit main body 81 and extends to the slider 82.

[0061] The slider 82 is attached to the operation unit main body 81 so as to be movable along the longitudinal direction A. A proximal end of the operation wire 2 is connected to the slider 82. The operator advances and retreats the slider 82 relative to the operation unit main body 81, thereby advancing and retreating the operation wire 2. Furthermore, the operator rotates the operation unit 8, thereby rotating the slider 82 and, in turn, rotating the forceps 5. A power supply connector 83 is fixed to the slider 82.

[0062] The power supply connector 83 can be connected to a high-frequency power supply device (not shown), and is electrically and physically connected to the proximal end of the manipulation wire 2. The power supply connector 83 can supply high-frequency current supplied from the high-frequency power supply device to the forceps 5 via the manipulation wire 2 and the support member 3.

[0063] [Method of Using the Endoscopic Treatment System 300] Next, a procedure (method of using the endoscopic treatment system 300) using the endoscopic treatment system 300 of this embodiment shown in Fig. 1 will be described. Specifically, the incision and ablation treatment of a lesion and hemostasis treatment in endoscopic treatment such as ESD (endoscopic submucosal dissection) will be described.

[0064] Incision and ablation procedures often result in bleeding. When bleeding occurs, the surgeon performs hemostatic procedures. Hemostatic procedures involve cauterizing the bleeding area after the lesion has been ablated, or the area that has bled during the incision or ablation procedure.

[0065] The surgeon grasps biological tissue including the bleeding site using the first gripping surface 64 and the second gripping surface 74 of the forceps 5. The forceps 5 are provided with a first contact protrusion 65 and a second contact protrusion 75 at their tips, which come into contact with each other when closed. Therefore, when the surgeon closes the forceps 5 to clamp the biological tissue between the first gripping surface 64 and the second gripping surface 74, the biological tissue is less likely to shift toward the tip side A1 of the forceps 5. As a result, the surgeon can suitably grasp the bleeding site between the first housing recess 66 and the second housing recess 76 of the forceps 5.

[0066] With the biological tissue pinched by the forceps 5, the surgeon applies high-frequency current to the operating wire 2. High-frequency current is applied to each of the first gripping surface 64 and the second gripping surface 74 that are in contact with the biological tissue, allowing the bleeding site to be cauterized. The surgeon continues the above-described operations (treatment) as necessary, and finally excises the lesion, completing the ESD procedure.

[0067] According to the endoscopic treatment tool 100 of this embodiment, when biological tissue to be treated is grasped by the first grasping surface 64 and the second grasping surface 74 of the forceps 5, the biological tissue is less likely to be pushed out toward the tip side (distal side) A1, making it easier to grasp the biological tissue to be treated. Furthermore, by making the forceps 5 (first forceps blade 6 and second forceps blade 7) horizontally cup-shaped, it is possible to grasp a wider range of biological tissue than conventionally.

[0068] 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.

[0069] The configuration of another embodiment of the treatment section 110 used in the endoscopic treatment tool 100 of the present invention will be described below.

[0070] Second Embodiment A treatment section 110B according to a second embodiment of the present invention will be described with reference to Figures 23 to 32. In the following description, components that are common to those already described will be assigned the same reference numerals, and duplicated description will be omitted.

[0071] 1 (also simply referred to as the treatment tool 100B) of the second embodiment is used as an endoscopic treatment system together with an endoscope 200, similar to the endoscopic treatment tool 100 of the first embodiment. The treatment tool 100B includes a sheath 1, a control wire 2, a support member 3, forceps 5B, and an operation section 8, similar to the above-described embodiments.

[0072] 23 to 31 , the treatment section 110B located at the distal end of the treatment tool 100B of the second embodiment includes forceps 5B. The forceps 5B of the present embodiment includes a first forceps blade 6B and a second forceps blade 7B. By closing the forceps 5B, it is possible to grasp biological tissue between the first gripping portion 61B of the first forceps blade 6B and the second gripping portion 71B of the second forceps blade 7B.

[0073] The first gripping portion 61B has a first gripping surface 64B that can face the second forceps blade 7B. The first gripping surface 64B has projections and recesses in the opening / closing direction B, and as shown in Fig. 27, has a plurality of recesses 68B and a plurality of teeth (first teeth) 69B on the proximal side of the first contact protrusion 65. The recesses 68B and the teeth 69B are alternately provided in the longitudinal direction A of the first gripping portion 61B.

[0074] The second gripping portion 71B has a second gripping surface 74B that can face the first forceps blade 6B. The second gripping surface 74B is a surface that has projections and depressions in the opening and closing direction B, and as shown in Fig. 27, has a plurality of recesses 78B and a plurality of teeth (second teeth) 79B on the proximal side of the second contact protrusion 75. The recesses 78B and the teeth 79B are provided alternately in the longitudinal direction A of the second gripping portion 71B.

[0075] In this embodiment, the first gripping portion 61B and the second gripping portion 71B have shapes that are symmetrical to each other across the central axis O5 of the forceps 5B, and the recesses 68B, 78B and the teeth 69B, 79B have the same shape.

[0076] The recesses 68B, 78B are groove-shaped and extend over the entire width direction C of each forceps piece 6B, 7B, and open to the outer circumferential surfaces (side surfaces on both sides) of the first forceps piece 6B and the second forceps piece 7B. The recesses 68B, 78B have a semicircular shape when viewed from the width direction C of the forceps 5B, but the shape of the recesses 68B, 78B is not limited to this.

[0077] The toothed portions 69B, 79B have a convex shape extending over the entire width direction C of each gripping portion 61B, 71B. Both side surfaces of the toothed portions 69B, 79B in the width direction C are inclined inward toward the tooth tips in the opening and closing direction B. The tooth tip surfaces of the plurality of toothed portions 69B and 79B have a planar shape parallel to the central axis O5 when the forceps 5B are in the closed state. When the forceps 5B are in the closed state, the distances from the tooth tip surfaces of the plurality of toothed portions 69B and 79B to the central axis O5 are all equal regardless of the position in the longitudinal direction A.

[0078] The positions of the recesses 68B and the recesses 78B in the longitudinal direction A of the forceps 5B are aligned with each other. The positions of the teeth 69B and the teeth 79B in the longitudinal direction A of the forceps 5B are also aligned with each other. Therefore, when the forceps 5 is closed, the recesses 68 in the first gripping portion 61B and the recesses 78 in the second gripping portion 71B face each other in the opening / closing direction B, and the teeth 69B in the first gripping portion 61B and the teeth 79B in the second gripping portion 71B face each other in the opening / closing direction B.

[0079] When the forceps 5B are closed, the contact surfaces of the first contact protrusion 65 and the second contact protrusion 75 coincide with the central axis O5 of the forceps 5B. Meanwhile, the teeth 69B of the first gripping portion 61B and the teeth 79B of the second gripping portion 71B do not come into contact with each other even when the forceps 5B are fully closed, leaving a slight gap between them. That is, the teeth 69B, 79B are located farther in the vertical direction B from the central axis O5 in the longitudinal direction A of the forceps 5B (first forceps blade 6B and second forceps blade 7B) than the gripping surface GP where the first gripping surface 64B and the second gripping surface 74B come into contact. This gap is smaller than the gap formed between the recesses 68B and 78B.

[0080] According to the forceps 5B of this embodiment, when the biological tissue to be treated is grasped with the first grasping surface 64B and the second grasping surface 74B of the forceps 5B, the unevenness formed by the recesses 68B, 78B and the teeth 69B, 79B makes it difficult for the biological tissue to be pushed out toward the tip side (distal side) A1, making it easier to grasp the biological tissue to be treated more stably.

[0081] Third Embodiment A treatment section 110C according to a third embodiment of the present invention will be described with reference to Figures 33 to 42. In the following description, components that are common to those already described will be assigned the same reference numerals, and duplicate descriptions will be omitted.

[0082] 1 (also simply referred to as the treatment tool 100C) of the third embodiment is used as an endoscopic treatment system together with an endoscope 200, similar to the endoscopic treatment tool 100 of the first embodiment. The treatment tool 100C includes a sheath 1, a manipulation wire 2, a support member 3, forceps 5C, and an operation unit 8.

[0083] [Treatment Section 110C] The treatment section 110C located at the tip of the treatment tool 100C of the third embodiment includes forceps 5C. The forceps 5C of this embodiment includes a first forceps blade 6C and a second forceps blade 7C. By closing the forceps 5C, it is possible to grasp biological tissue between a first gripping portion 61C of the first forceps blade 6C and a second gripping portion 71C of the second forceps blade 7C.

[0084] The first gripping portion 61C has a first gripping surface 64C that can face the second forceps piece 7C. The first gripping surface 64C has projections and depressions in the opening / closing direction B, and has a plurality of recesses 68C and a plurality of teeth 69C (first teeth) on the proximal side of the first contact protrusion 65 that contacts the second gripping surface 74C. The recesses 68C and the teeth 69C are alternately provided in the longitudinal direction A of the first gripping portion 61C.

[0085] The second gripping portion 71C has a second gripping surface 74C that can face the first forceps blade 6C. The second gripping surface 74C is a surface that is uneven in the opening / closing direction B and has a plurality of recesses 78C and a plurality of teeth (second teeth) 79C on the proximal side of the second contact protrusion 75. The recesses 78C and the teeth 79C are provided alternately in the longitudinal direction A of the second gripping portion 71C.

[0086] In this embodiment, the recesses 68C, 78C have a trapezoidal shape that widens toward the central axis O5 in a side view seen from the width direction C. The bottom surfaces of the recesses 68C aligned in the longitudinal direction A are all at the same height position and are all at the same distance from the central axis O5. Similarly, the bottom surfaces of the recesses 78C aligned in the longitudinal direction A are all at the same height position and are all at the same distance from the central axis O5. Furthermore, the bottom surfaces of the recesses 68C, 78C are all parallel to the central axis O5.

[0087] In this embodiment, the tooth portions 69C, 79C have a trapezoidal shape that widens in a direction away from the central axis O5 in a side view seen from the width direction C. The height positions of the tooth tip surfaces of the multiple tooth portions 69C, 79C aligned in the longitudinal direction A are different from one another. In other words, the tooth portions 69C, 79C located closer to the base end have lower tooth tip surfaces and are farther away from the central axis O5.

[0088] In this embodiment, the first gripping portion 61C and the second gripping portion 71C are symmetrical to each other with respect to the central axis O5 of the forceps 5C, but the height of the tooth tip surfaces of the multiple tooth portions 69C (tooth portions 79C) arranged in the longitudinal direction A decreases toward the base end.

[0089] Specifically, the tooth 69C (tooth 79C) located closer to the base end has a tooth tip surface that is farther away from the central axis O5 of the forceps 5C when the forceps 5C is in the closed state. In other words, the longest distance between the tooth 69C of the first forceps piece 6C and the tooth 79C of the second forceps piece 7C, which face each other when the forceps 5C is in the closed state, is the distance between the tooth 69C, 79C located closest to the base end, and the distance between the tooth 69C, 79C becomes longer as the tooth 69C, 79C is positioned closer to the base end.

[0090] 37 , a virtual line K3 connecting the midpoints of the tip surfaces of the teeth 69C aligned in the longitudinal direction A is inclined at a predetermined angle with respect to the central axis O5 and forms a straight line that is lower (moves away from the central axis O5) from the distal end to the proximal end of the forceps 5C. Similarly, a virtual line (not shown) connecting the midpoints of the tip surfaces of the teeth 79C aligned in the longitudinal direction A is also inclined at the same angle as the virtual line K3 with respect to the central axis O5.

[0091] Furthermore, the tooth portions 69C, 79C located closest to the base end have a tooth tip surface with a larger width in the longitudinal direction A than the other tooth portions 69C, 79C.

[0092] According to the forceps 5C of this embodiment, when the forceps 5C are closed, the gap between the teeth 69C, 79C becomes wider as they move toward the base end, so that there is more space for the target tissue to fit at the rear end (proximal side) of the forceps 5C than in the second embodiment, making it possible to grasp the target tissue more effectively without it escaping.

[0093] (Fourth embodiment) A treatment section 110D according to a fourth embodiment of the present invention will be described with reference to Figures 43 to 52. In the following description, components that are common to those already described will be assigned the same reference numerals, and duplicate descriptions will be omitted.

[0094] 1 (also simply referred to as the treatment tool 100D) of the fourth embodiment is used as an endoscopic treatment system together with an endoscope 200, similar to the endoscopic treatment tool 100 of the first embodiment. The treatment tool 100D includes a sheath 1, a manipulation wire 2, a support member 3, forceps 5D, and an operation section 8.

[0095] [Treatment Section 110D] The treatment section 110D located at the tip of the treatment tool 100D of the fourth embodiment includes forceps 5D. The forceps 5D of this embodiment includes a first forceps blade 6D and a second forceps blade 7D. By closing the forceps 5D, it is possible to grasp biological tissue between a first gripping portion 61D of the first forceps blade 6D and a second gripping portion 71D of the second forceps blade 7D.

[0096] The first gripping portion 61D has a first gripping surface 64D that can face the second forceps piece 7D. The first gripping surface 64D has projections and depressions in the opening and closing direction, and has a plurality of recesses 68D and a plurality of teeth (first teeth) 69D on the proximal side of the first contact protrusion 65 that contacts the second gripping surface 74D. The recesses 68D and the teeth 69D are alternately provided in the longitudinal direction A of the first gripping portion 61D.

[0097] The second gripping portion 71C has a second gripping surface 74D that can face the first forceps piece 6D. The second gripping surface 74D is a surface that is uneven in the opening and closing direction and has a plurality of recesses 78D and a plurality of teeth (second teeth) 79D on the proximal side of the second contact protrusion 75. The recesses 78D and the teeth 79D are provided alternately in the longitudinal direction A of the second gripping portion 71D.

[0098] In this embodiment, in the closed state, the plurality of toothed portions 69D of the first gripping portion 61D and the plurality of toothed portions 79D of the second gripping portion 71D do not come into contact with each other, and a gap is formed between them. The gaps between the toothed portions 69D and 79D that face each other in the closed state are all equal regardless of their positions in the longitudinal direction A. That is, the distances from the tip surfaces of the plurality of toothed portions 69D and the plurality of toothed portions 79D to the central axis O5 are equal, and the tip surfaces of the toothed portions 69D and 79D are parallel to the central axis O5.

[0099] On the other hand, the bottom surfaces of the recesses 68D, 78D become lower (farther away from the central axis O5) as they approach the base end. That is, the recesses 68D, 78D located closer to the base end have a shape in which the grooves become deeper, with the recesses 68D, 78D closest to the base end being the deepest and farthest from the central axis O5.

[0100] 47 , an imaginary line R4 connecting the midpoints of the bottom surfaces of the plurality of recesses 68D aligned in the longitudinal direction A is inclined at a predetermined angle with respect to the central axis O5 and forms a straight line that is lower at the base end than at the tip end of the forceps 5D. Similarly, an imaginary line (not shown) connecting the midpoints of the tip surfaces of the plurality of teeth 79D aligned in the longitudinal direction A is also inclined at the same angle as the imaginary line R4 with respect to the central axis O5. Furthermore, the widths of the tooth tip surfaces of the plurality of teeth 69D, 79D in the longitudinal direction A are all equal.

[0101] According to the forceps 5D of the present embodiment, when the forceps 5D are closed, the recesses 68D, 78D, which become deeper toward the base end, face each other. This provides a larger space for the target tissue to fit at the rear end (proximal side) of the forceps 5D than in the second embodiment, making it possible to grasp the target tissue more effectively without letting it escape.

[0102] Fifth Embodiment A treatment section 110E according to a fifth embodiment of the present invention will be described with reference to Figures 53 to 62. In the following description, components that are common to those already described will be assigned the same reference numerals, and duplicate descriptions will be omitted.

[0103] 1 (also simply referred to as the treatment tool 100E) of the fifth embodiment is used as an endoscopic treatment system together with an endoscope 200, similar to the endoscopic treatment tool 100 of the first embodiment. The treatment tool 100E includes a sheath 1, a manipulation wire 2, a support member 3, forceps 5D, and an operation section 8.

[0104] [Treatment Section 110E] The treatment section 110E located at the tip of the treatment tool 100E of the fifth embodiment includes forceps 5E. The forceps 5E of this embodiment includes a first forceps blade 6E and a second forceps blade 7E. By closing the forceps 5E, it is possible to grasp biological tissue between a first gripping portion 61E of the first forceps blade 6E and a second gripping portion 71E of the second forceps blade 7E.

[0105] In this embodiment, when the forceps 5E are in a closed state, all of the teeth (first teeth) 69E of the first gripping portion 61E and all of the teeth (second teeth) 79E of the second gripping portion 71E come into contact with each other on a gripping surface GP that passes through the central axis O5 of the forceps 5E.

[0106] In this embodiment, the bottom surfaces of the recesses 68E, 78E provided in each gripping portion 61E, 71E are gradually lowered (moved farther from the central axis O5) toward the base end. That is, the recesses 68E, 78E located closer to the base end are deeper, and the recesses 68E, 78E closest to the base end are the deepest and farthest from the central axis O5.

[0107] According to the forceps 5E of this embodiment, when the forceps 5E are closed, the teeth 68E, 78E, which are deeper toward the base end, face each other, so that the space for the target tissue is larger on the base end side (proximal side) of the forceps 5E than in the second embodiment, making it possible to grasp the target tissue without letting it escape. Also, because all of the teeth 69E, 79E are in contact with each other, they can more easily bite into the biological tissue, enabling more reliable grasping.

[0108] Sixth Embodiment A treatment section 110F according to a sixth embodiment of the present invention will be described with reference to Figures 63 to 72. In the following description, components that are common to those already described will be assigned the same reference numerals, and duplicated description will be omitted.

[0109] 1 (also simply referred to as the treatment tool 100F) of the sixth embodiment is used as an endoscopic treatment system together with an endoscope 200, similar to the endoscopic treatment tool 100 of the first embodiment. The treatment tool 100F includes a sheath 1, a manipulation wire 2, a support member 3, forceps 5F, and an operation section 8.

[0110] [Treatment Section 110F] The treatment section 110F located at the tip of the treatment tool 100F of the sixth embodiment includes forceps 5F. The forceps 5F of this embodiment includes a first forceps blade 6F and a second forceps blade 7F. By closing the forceps 5F, it is possible to grasp biological tissue between a first gripping portion 61F of the first forceps blade 6F and a second gripping portion 71F of the second forceps blade 7F.

[0111] The first gripping surface 64F of the first gripping portion 61F is a surface having projections and recesses in the opening / closing direction B, and has a plurality of recesses 68F and a plurality of teeth (first teeth) 69F on the proximal side of the first contact protrusion 65 that contacts the second gripping surface 74F. The recesses 68F and the teeth 69F are alternately provided in the longitudinal direction A of the first gripping portion 61F.

[0112] The second gripping portion 71F has a second gripping surface 74F that can face the first forceps piece 6F. The second gripping surface 74F is a surface that is uneven in the opening and closing direction B, and has a plurality of recesses 78F and a plurality of teeth (second teeth) 79F on the proximal side of the second contact protrusion 75. The recesses 78F and the teeth 79F are provided alternately in the longitudinal direction A of the second gripping portion 71F.

[0113] In this embodiment, the tooth portions 69F, 79F arranged in the longitudinal direction A are at different height positions, and the tooth portions 69F, 79F closer to the base end are lower in height and further away from the central axis O5. An imaginary line K6 connecting the midpoints of the tooth tip surfaces of the tooth portions 69F (79F) arranged in the longitudinal direction A is inclined at a predetermined angle with respect to the central axis O5 and forms a straight line that is lower on the base end side than on the tip end side.

[0114] In this embodiment, the depths of the multiple recesses 68F, 78F lined up in the longitudinal direction are also different, and the recesses 68F, 78F closer to the base end have lower bottom surfaces and are further away from the central axis O5. An imaginary line R6 connecting the midpoints of the bottom surfaces of the multiple recesses 68F (78F) lined up in the longitudinal direction A is inclined at a predetermined angle with respect to the central axis O5, and is an inclined surface that is lower on the base end side than on the tip end side.

[0115] 67 , the angle formed by the central axis O5 and an imaginary line R6 connecting the midpoints of the bottom surfaces of the plurality of recesses 68F arranged in the longitudinal direction A is smaller than the angle formed by the central axis O5 and an imaginary line K6 connecting the midpoints of the tip surfaces of the plurality of tooth portions 69F arranged in the longitudinal direction A. In other words, the slope of the bottom surfaces of the recesses 68F, 78F is smaller than the slope of the tooth surfaces of the tooth portions 69F, 79F. Therefore, the depth of the recesses 68F, 78F becomes shallower toward the base end, and the distance between the opposing forceps pieces 6F, 7F becomes greater.

[0116] According to the forceps 5F of this embodiment, when the forceps 5F are closed, the uneven shape becomes smaller as it approaches the base end, so there is more space for the target tissue to fit on the base end side (proximal side) of the forceps 5F than in the second embodiment, making it possible to grasp the target tissue without letting it escape.

[0117] Seventh Embodiment A treatment section 110H according to a seventh embodiment of the present invention will be described with reference to Figures 73 to 82. In the following description, components common to those already described will be assigned the same reference numerals, and duplicated description will be omitted.

[0118] 1 (also simply referred to as the treatment tool 100H) of the seventh embodiment is used as an endoscopic treatment system together with an endoscope 200, similar to the endoscopic treatment tool 100 of the first embodiment. The treatment tool 100H includes a sheath 1, a manipulation wire 2, a support member 3, forceps 5H, and an operation section 8.

[0119] [Treatment Section 110H] The treatment section 110H located at the tip of the treatment tool 100H of the eighth embodiment includes forceps 5H. The forceps 5H of this embodiment includes a first forceps blade 6H and a second forceps blade 7H. By closing the forceps 5H, it is possible to grasp biological tissue between the first gripping portion 61H of the first forceps blade 6H and the second gripping portion 71H of the second forceps blade 7H.

[0120] 77 and 78 , the first gripping portion 61H has a first gripping surface 64H that can face the second forceps blade 7H. The second gripping portion 71H also has a second gripping surface 74H that can face the first forceps blade 6H. The first gripping surface 64H and the second gripping surface 74H face each other when the forceps 5H are in the closed state, and each have contact protrusions 65, 75 that come into contact with each other on a gripping surface GP that passes through the central axis O5 of the forceps 5H when the forceps 5H are in the closed state, non-contacting accommodating recesses 66H, 76H, and notches 67, 77 provided on the distal end sides of the accommodating recesses 66H, 76H.

[0121] The accommodating recesses 66H, 76H are recesses that are recessed in a direction away from the central axis O5 when the forceps 5H is in the closed state. The accommodating recesses 66H, 76H gradually increase in depth from the proximal end of the contact protrusions 65, 75 toward the proximal end of the forceps 5H. The accommodating recesses 66H, 77H have curved surfaces 66h1, 76h1 located on the respective distal end sides (contact protrusions 65, 75 sides) and inclined surfaces 66h2, 76h2 located on the proximal end sides of the curved surfaces 66h1, 76h1.

[0122] The curved surfaces 66h1, 76h1 occupy approximately one-fourth of the length of the accommodation recesses 66H, 76H in the longitudinal direction A from the distal end. The inclined surfaces 66h2, 76h2 occupy the remaining approximately three-fourths of the length, so that the middle portion of the forceps 5H has a tapered shape that widens toward the proximal end due to the inclined surfaces 66h2, 76h2.

[0123] The inclined surfaces 66h2 and 76h2 are inclined at a predetermined angle with respect to the central axis O5. In the present embodiment, the inclination angle θ6 of the inclined surface 66h2 with respect to the central axis O5 and the inclination angle θ7 of the inclined surface 67h2 with respect to the central axis O5 are equal to each other, but may be different.

[0124] According to the forceps 5H of the present embodiment, the groove depth of the storage recesses 66, 76 increases toward the base end, and the distance between the opposing gripping surfaces 64H, 74H increases. Therefore, compared to the first embodiment described above, there is more space available for the target tissue to fit into on the base end side (proximal side) of the forceps 5H, and when the forceps 5H is closed and the target tissue is gripped between the contact protrusions 65, 75 at the tip, the target tissue is less likely to escape.

[0125] Furthermore, a portion of the target tissue grasped by the contact convex portions 65, 75 slightly enters the notches 67, 77 provided at the tip of each grasping portion 61H, 71H, causing the target tissue to become caught on each grasping portion 61H, 71H, making it possible to grasp the target tissue without letting it escape.

[0126] Eighth Embodiment A treatment section 110I according to an eighth embodiment of the present invention will be described with reference to Figures 83 to 92. In the following description, components common to those already described will be assigned the same reference numerals, and duplicated description will be omitted.

[0127] 1 (also simply referred to as the treatment tool 100I) of the eighth embodiment is used as an endoscopic treatment system together with an endoscope 200, similar to the endoscopic treatment tool 100 of the first embodiment. The treatment tool 100I includes a sheath 1, a manipulation wire 2, a support member 3, forceps 5I, and an operation section 8.

[0128] [Treatment Section 110I] The treatment section 110I located at the tip of the treatment tool 100I of the eighth embodiment includes forceps 5I. The forceps 5I of this embodiment includes a first forceps blade 6I and a second forceps blade 7I. By closing the forceps 5I, it is possible to grasp biological tissue between a first gripping portion 61I of the first forceps blade 6I and a second gripping portion 71I of the second forceps blade 7I.

[0129] 87 and 88 , the first gripping portion 61I has a first gripping surface 64I that can face the second forceps blade 7I. The second gripping portion 71I has a second gripping surface 74I that can face the first forceps blade 6I. The first gripping surface 64I and the second gripping surface 74I are surfaces that face each other when the forceps 5I is in the closed state, and each have contact protrusions 65, 75 that come into contact with each other on a gripping surface GP that passes through the central axis O5 of the forceps 5I when the forceps 5I is in the closed state, and accommodation recesses 66I, 76I that do not come into contact with each other.

[0130] The accommodating recesses 66I, 76I are recesses recessed downward B1 or upward B2 from the gripping surface GP when the forceps 5I is in the closed state, and are provided on the proximal end side of the contact protrusions 65, 75. The groove depth of the accommodating recesses 66I, 76I varies in the longitudinal direction A. In this embodiment, the groove depth of the accommodating recesses 66I, 76I is deepest at a position closer to the front end than halfway along the length of the accommodating recess 66I, 76I in the longitudinal direction A, and becomes shallower toward the rear end.

[0131] The accommodating recess 66I has a curved surface 66i1 located on the front end side and an inclined surface 66i2 located on the rear end side, and the boundary between them is smooth and without any steps. The accommodating recess 76I has a curved surface 76i1 located on the front end side and an inclined surface 76i2 located on the rear end side, and the boundary between them is smooth and without any steps.

[0132] The curved surfaces 66i1, 76i1 are arcs centered on points (not shown) located on the opposing gripping portions 61I, 71I sides, and are curved more toward the lower side B1 or the upper side B2 than in the first embodiment.

[0133] The inclined surfaces 66i2 and 76i2 are connected to the proximal ends of the curved surfaces 66i1 and 76i1, and are formed in a generally flat shape on the lower side B1 or the upper side B2 of the gripping surface GP. The inclined surfaces 66i2 and 76i2 are inclined at a predetermined angle with respect to the central axis O5, and approach each other as they approach the proximal ends.

[0134] According to the forceps 5I of this embodiment, the groove depth of the accommodation recesses 66I, 76I is greater on the tip (contact protrusions 65, 75) side than on the base end side, so that when biological tissue of the target tissue is grasped by the first gripping surface 64I and the second gripping surface 74I of the forceps 5I, the vicinity of the part grasped by the contact protrusions 65, 75 can be accommodated in the accommodation recesses 66I, 76I. This makes it more difficult for the biological tissue to be pushed out toward the tip side (distal side) A1, making it easier to grasp the biological tissue to be treated more stably.

[0135] Ninth Embodiment A treatment section 110J according to a ninth embodiment of the present invention will be described with reference to Figures 93 to 102. In the following description, components that are common to those already described will be assigned the same reference numerals, and duplicated description will be omitted.

[0136] 93 (also simply referred to as the treatment tool 100J) of the ninth embodiment is used as an endoscopic treatment system together with an endoscope 200, similar to the endoscopic treatment tool 100 of the first embodiment. The treatment tool 100J includes a sheath 1, a manipulation wire 2, a support member 3, forceps 5J, and an operation unit 8.

[0137] [Treatment Section 110J] The treatment section 110J located at the tip of the treatment tool 100J of the ninth embodiment includes forceps 5J. The forceps 5J of this embodiment includes a first forceps blade 6J and a second forceps blade 7J. By closing the forceps 5J, it is possible to grasp biological tissue between a first gripping portion 61J of the first forceps blade 6J and a second gripping portion 71J of the second forceps blade 7J.

[0138] 97 and 98 , the first gripping portion 61J has a first gripping surface 64J that can face the second forceps blade 7J. The second gripping portion 71J has a second gripping surface 74J that can face the first forceps blade 6J. The first gripping surface 64J and the second gripping surface 74J are surfaces that face each other when the forceps 5J is in the closed state, and each have contact protrusions 65, 75 that come into contact with each other on a gripping surface GP that passes through the central axis O5 of the forceps 5J when the forceps 5J is in the closed state, and accommodation recesses 66J, 76J that do not come into contact with each other.

[0139] In this embodiment, the area of ​​the gripping surfaces GP that face each other when the forceps 5J are in the closed state is larger than in the above-described embodiments. Specifically, the contact protrusions 65, 75 of the forceps 5J of this embodiment have a length in the longitudinal direction A and a depth that is approximately twice as large as in the above-described embodiments. This configuration increases the engagement area of ​​the forceps 5J, enabling a wider cauterization range.

[0140] The accommodating recesses 66J, 76J are recesses recessed downward B1 or upward B2 from the gripping surface GP when the forceps 5J is in the closed state, and are provided on the proximal end side of the contact protrusions 65, 75. The groove depth of the accommodating recesses 66J, 76J varies in the longitudinal direction A. In this embodiment, the groove depth of the accommodating recesses 66J, 76J increases from the proximal end side of the contact protrusions 65, 75 toward a position approximately halfway along the longitudinal direction A of the accommodating recesses 66J, 76J, and remains constant from the deepest position toward the rear end. In other words, the proximal end side of the accommodating recesses 66J, 76J is formed in a substantially flat shape.

[0141] Furthermore, notched surfaces 62, 72 that are cut out from the outer periphery inward in the width direction are formed on both widthwise sides of the first gripping portion 61J and the second gripping portion 71J. By providing the notched surfaces 62, 72, corners (vertices) 6j, 7j formed at the boundaries between the contact protrusions 65, 75 and the flat surfaces of the contact protrusions 65, 75 are positioned inside the forceps 5J. This prevents the corners 6j, 7j from getting caught on biological tissue around the target tissue when the forceps 5J is opened or closed, allowing the forceps 5J to be opened and closed smoothly.

[0142] A treatment section 110K according to a tenth embodiment of the present invention will be described with reference to Figures 103 to 113. In the following description, components that are common to those already described will be assigned the same reference numerals, and duplicated description will be omitted.

[0143] 103 (also simply referred to as the treatment tool 100K) of the ninth embodiment is used as an endoscopic treatment system together with an endoscope 200, similar to the endoscopic treatment tool 100 of the first embodiment. The treatment tool 100K includes a sheath 1, a manipulation wire 2, a support member 3, forceps 5K, and an operation unit 8.

[0144] [Treatment Section 110K] The treatment section 110K located at the tip of the treatment tool 100K of the tenth embodiment includes forceps 5K. The forceps 5K of this embodiment includes a first forceps blade 6K and a second forceps blade 7K. By closing the forceps 5K, it is possible to grasp biological tissue between a first gripping portion 61K of the first forceps blade 6K and a second gripping portion 71K of the second forceps blade 7K.

[0145] In this embodiment, as shown in Fig. 105, the outer shape of the tip side A1 of the first forceps blade 6K is semicircular, and the teeth provided on the tip side A1 of the first forceps blade 6K have an arc-like shape that follows the outer shape. Also, the outer shape of the tip side A1 of the second forceps blade 7K is semicircular, and the teeth provided on the tip side A1 of the second forceps blade 7K have an arc-like shape that follows the outer shape. Therefore, as shown in Fig. 113, when the target tissue is brought close to the side of the forceps 5K, it is easy to grasp the target tissue with the first forceps blade 6K and the second forceps blade 7K.

[0146] Although the preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments. Addition, omission, substitution, and other modifications of the configuration are possible within the scope of the spirit of the present invention. Furthermore, the present invention is not limited by the above description, but is limited only by the scope of the appended claims.

[0147] As shown in the front views of the above embodiments, when the forceps are viewed from the tip (A2) side in the longitudinal direction A, the dimensions of the contact protrusions 65, 75 in the width direction C are equal to each other, and both are shorter than the maximum width dimension of the forceps in the width direction C.

[0148] The present invention can be applied to endoscopic treatment tools such as hemostatic forceps.

[0149] 1... Sheath 5, 5B, 5C, 5D, 5E, 5F, 5G, 5H, 5I, 5J, 5K... Forceps O5... Central shaft 6, 6B, 6C, 6D, 6E, 6F, 6G, 6H, 6I, 6J, 6K... First forceps piece 7, 7B, 7C, 7D, 7E, 7F, 7G, 7H, 7I, 7J, 7K...Second forceps piece 64, 64B, 64C, 64D, 64F, 64G, 64H, 64I...First gripping surface 69, 69B, 69C, 69D, 69F... Teeth (first tooth) 74, 74B, 74C, 74D, 74F, 74G, 74H, 74I...second gripping surface 79B, 79C, 79D, 79E, 79F... Tooth portion (second tooth portion) 100, 100B, 100C, 100D, 100E, 100F, 100G, 100H, 100I, 100J, 100K... Treatment tool A... Longitudinal direction B... Thickness direction, up-down direction, opening / closing direction C... Width direction, left-right direction GP... Grip surface L1... Length of forceps in width direction C L2... Length of forceps in longitudinal direction A O5... Central axis of forceps in longitudinal direction R... Central axis of pin 36 T... Length of forceps in thickness direction B W... Opening width of forceps

Claims

1. A sheath, a forceps having a first forceps piece provided on a distal end side of the sheath and a second forceps piece that opens and closes relative to the first forceps piece; Equipped with The first forceps piece has a plurality of first teeth portions and a plurality of first recesses that protrude toward the second forceps piece and are alternately arranged in a central axis direction, when the first forceps piece and the second forceps piece are closed, an angle formed by an imaginary line connecting midpoints of bottom surfaces of the plurality of first recesses and the central axis is smaller than an angle formed by an imaginary line connecting midpoints of upper ends of teeth of the plurality of first tooth portions and the central axis in a side view perpendicular to the central axis of the sheath. Treatment tools.

2. The second forceps piece has a plurality of second teeth and a plurality of second recesses that protrude toward the first forceps piece and are alternately arranged in the central axis direction, when the first forceps piece and the second forceps piece are closed, an angle formed by an imaginary line connecting midpoints of bottom surfaces of the plurality of second recesses and the central axis is smaller than an angle formed by an imaginary line connecting midpoints of upper ends of teeth of the plurality of second tooth portions and the central axis in a side view perpendicular to the central axis of the sheath. The treatment tool according to claim 1.

3. The width direction length of the first forceps piece and the second forceps piece is equal to or less than the maximum outer diameter of the sheath. The treatment tool according to claim 1.

4. The width direction length of the forceps is 1.0 times or more and 1.6 times or less than the longitudinal direction length of the forceps. The treatment tool according to any one of claims 1 to 3.

5. The width of the forceps when fully opened is 1.7 to 2.8 times the length of the forceps in the longitudinal direction. The treatment tool according to any one of claims 1 to 3.

6. The length of the forceps in a thickness direction perpendicular to the longitudinal direction when the forceps are closed is 0.2 to 0.6 times the length of the forceps in the longitudinal direction. The treatment tool according to any one of claims 1 to 3.

7. The width of the forceps is 1.1 times the length of the forceps in the longitudinal direction. The treatment tool according to any one of claims 1 to 3.

8. The maximum open width of the forceps is 2.0 times the length of the forceps in the longitudinal direction. The treatment tool according to any one of claims 1 to 3.

9. When the forceps are closed, the length in the thickness direction perpendicular to the longitudinal direction is 0.3 times the length of the forceps pieces in the longitudinal direction. The treatment tool according to any one of claims 1 to 3.

10. In a side view from a direction perpendicular to the central axis of the sheath, when the first forceps piece and the second forceps piece are closed, upper ends of the teeth of the plurality of first teeth portions extend parallel to the central axis of the sheath. The treatment tool according to any one of claims 1 to 3.