Clamp unit

Abstract

The jig unit is provided with: a jig having a first arm and a second arm that can be opened and closed toward the tip side; and a tubular member capable of receiving at least a portion of the clip, the first arm having, at a front end, a first claw extending toward a closing side in an opening / closing direction, the first claw having a first anchor.

Description

Technical Field

[0001] This invention relates to clamping units. This application claims the benefit of U.S. Provisional Application No. 63 / 508,592, filed June 16, 2023, the entire contents of which are incorporated herein by reference. Background Technology

[0002] In endoscopic treatment, a clamp unit is used to achieve hemostasis by ligating the resected portion after treatment. The clamp unit includes clamps for holding the resected portion and a clamping tube for receiving the clamps and locking them in a closed state. The clamp unit is introduced to the treatment position by a clamp introduction device that passes through a channel of the endoscope.

[0003] Patent Document 1 describes a treatment device for puncturing biological tissue. The treatment device described in Patent Document 1 can be left in the body in a punctured state within the biological tissue.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 9-38093 Summary of the Invention

[0007] The problem the invention aims to solve

[0008] However, the treatment device described in Patent Document 1 is not necessarily the most suitable treatment device for performing treatments such as suturing and tightening the excised portion or defect of tissue.

[0009] In view of the above, the object of the present invention is to provide a clamping system most suitable for suturing and tightening biological tissues.

[0010] Solution for solving the problem

[0011] To address the above problems, the present invention proposes the following solution.

[0012] The clamping unit of the first technical solution of the present invention comprises: a clamp having a first arm and a second arm capable of opening and closing toward a front end side; and a tubular member capable of receiving at least a portion of the clamp, wherein the first arm has a first claw extending toward a closed side in the opening and closing direction at its front end, and the first claw has a first anchoring member.

[0013] The effects of the invention

[0014] The clamping unit of the present invention can appropriately perform treatments such as suturing and tightening the cut portion or the defect portion. Attached Figure Description

[0015] Figure 1This is a perspective view of the clamp guide device of the clamp conveying device according to the first embodiment.

[0016] Figure 2 This is a perspective view of the clamping unit of the aforementioned clamping and conveying device.

[0017] Figure 3 This is a perspective view of the aforementioned clamping unit when the pressing component is shown in perspective.

[0018] Figure 4 This is a diagram showing the pair of arms of the aforementioned clamping unit in a closed state, viewed from the length direction.

[0019] Figure 5 This is a diagram showing a variation of the first anchoring element.

[0020] Figure 6 This is a diagram showing a modified example of the first anchoring element described above.

[0021] Figure 7 This is a diagram showing the pair of arms in a closed state as viewed from opposite directions.

[0022] Figure 8 This is a diagram of the pair of arms in the closed state as viewed from the opening and closing direction.

[0023] Figure 9 This is a cross-sectional view along the length of the aforementioned pressing component.

[0024] Figure 10 This is a perspective view of the connecting components of the aforementioned fixture unit.

[0025] Figure 11 This is a diagram showing the clamp unit loaded into the clamp guide device.

[0026] Figure 12 This is a diagram showing the aforementioned clamp unit inserted into the body.

[0027] Figure 13 This is a diagram showing the aforementioned clamping unit holding the first mucosa.

[0028] Figure 14 This is a diagram showing the first mucosa held by a pair of arms.

[0029] Figure 15 This is a diagram showing the clamping unit described above, in which the second claw has been pulled out from the first mucosa.

[0030] Figure 16 This is a diagram showing the first mucosa after the second claw has been pulled out.

[0031] Figure 17 This is a diagram showing the aforementioned clamping unit holding the second mucosa.

[0032] Figure 18 This is a diagram showing the clamp unit that closes the aforementioned pair of arms.

[0033] Figure 19 This is a diagram showing the aforementioned clamp unit where the clamp is locked.

[0034] Figure 20 This is a diagram showing the fixture unit after the fixture has been separated.

[0035] Figure 21 This is a diagram showing the aforementioned clamping unit after it has broken.

[0036] Figure 22 This is a diagram showing a modified example of the second claw described above.

[0037] Figure 23 This is a diagram showing a variation of the first claw and the second claw described above.

[0038] Figure 24 The figure shows a modified example of the pressing member and a modified example of the pair of arms.

[0039] Figure 25 The figure shows a modified example of the pressing member and a modified example of the pair of arms.

[0040] Figure 26 The figure shows a modified example of the pressing member and a modified example of the pair of arms.

[0041] Figure 27 The figure shows a modified example of the pressing member and a modified example of the pair of arms.

[0042] Figure 28 This is a diagram showing the clamping unit of the second embodiment.

[0043] Figure 29 This is a diagram representing the aforementioned fixture unit.

[0044] Figure 30 This is a diagram representing the aforementioned fixture unit.

[0045] Figure 31 This is a diagram showing a modified example of the fixture of the above-mentioned fixture unit.

[0046] Figure 32 This is a diagram showing a variation of the aforementioned fixture.

[0047] Figure 33 This is a diagram showing a variation of the aforementioned fixture.

[0048] Figure 34 This is a diagram illustrating the above variation.

[0049] Figure 35This is a diagram showing the clamping unit of the third embodiment.

[0050] Figure 36 This is a diagram representing the aforementioned fixture unit.

[0051] Figure 37 This is a diagram representing the aforementioned fixture unit.

[0052] Figure 38 This is a diagram showing a modified example of the fixture of the above-mentioned fixture unit.

[0053] Figure 39 This is a diagram showing the clamping unit of the fourth embodiment.

[0054] Figure 40 This is a diagram representing the aforementioned fixture unit.

[0055] Figure 41 This is a diagram representing the aforementioned fixture unit.

[0056] Figure 42 This is a diagram showing a modified example of the inner side anchor.

[0057] Figure 43 This is a diagram showing a variation of the fixture.

[0058] Figure 44 This is a diagram showing a variation of the first and second claws.

[0059] Figure 45 This is a diagram showing a variation of the first and second claws.

[0060] Figure 46 This is a diagram showing a variation of the first and second claws. Detailed Implementation

[0061] (First Implementation)

[0062] Reference Figures 1 to 21 The clamp conveying device 300 of the first embodiment of the present invention will be described.

[0063] [Clamping and conveying device 300]

[0064] The fixture conveying device (fixture system) 300 includes a fixture guide device (supplyer) 200 and a fixture unit 100. The fixture unit 100 is loaded into the fixture guide device 200.

[0065] [Clamping guide device 200]

[0066] Figure 1 This is a perspective view of the clamping guide device 200.

[0067] The clamp insertion device (supplyer) 200 includes a sheath 220, an operating line 230, and an operating section 240. The clamp insertion device 200 extends, for example, through the instrument passage of an endoscope and is used in conjunction with the endoscope. Therefore, the sheath 220 is configured to be sufficiently longer than the length of the instrument passage of the endoscope. The sheath 220 is flexible, bending to accommodate the bending of the insertion portion of the endoscope.

[0068] The sheath 220 has a front end head 221, a front side coil 222, and a side coil 224, and is formed into a slender tubular shape. The front side coil 222 is disposed on the front end side of the sheath 220. The front end head 221 is disposed on the front end of the front side coil 222.

[0069] like Figure 1 As shown, the operation line (power transmission section) 230 has an arrow hook (connection section) 231 and an operation arrow hook 231 line member 232 that are connected to the clamp unit 100.

[0070] The arrow hook portion 231 has a generally conical engaging portion 231a that engages with the clamp unit 100, and a wire connecting portion 231b provided at the base end of the engaging portion 231a. The arrow hook portion 231 is formed of a metal material such as stainless steel.

[0071] The wire member 232 extends freely through the sheath 220 relative to the sheath 220. The front end of the wire member 232 is fixed to the base end of the wire connection portion 231b, for example, by welding.

[0072] like Figure 1 As shown, the operating part 240 includes an operating part body 241, a slider 242, and a thumb ring 248. The operating part body 241 is injection molded from resin material, for example. The operating part body 241 includes a slit portion 241a and a rotating handle 241b located at the front end. The slit portion 241a supports the slider 242 so that it can move forward and backward.

[0073] The slider 242 is installed in a manner that allows it to move forward and backward along the longitudinal axis of the operating part body 241, and the base end of the wire member 232 is mounted on the slider 242. By moving the slider 242 forward and backward along the operating part body 241, the wire member 232 moves forward and backward relative to the sheath 220, and the arrow hook portion 231 moves forward and backward.

[0074] The thumb ring 248 is mounted on the base of the operating part body 241 in such a way that it can rotate about the length axis of the operating part body 241.

[0075] [Clamping Unit 100]

[0076] Figure 2 This is a perspective view of fixture unit 100. Figure 3This is a perspective view of the clamp unit 100 when the pressing member 3 is shown in perspective. The clamp unit 100 includes a clamp 2, a pressing member 3, and a connecting member 4.

[0077] In the following description, the clamp 2 side in the length direction A of the clamp unit 100 is designated as the front end side (far side) A1 of the clamp unit 100, and the connecting member 4 side is designated as the base end side (proximal side) A2 of the clamp unit 100.

[0078] The clamp 2 is formed by bending a sheet metal at its central portion. The clamp 2 has a pair of arms 21 that can open and close toward the front end side A1 and a base end 28 connecting the pair of arms 21. The base end side A2 of the clamp 2 is inserted into the internal space 38 of the pressing member 3 (see reference). Figure 9 ).

[0079] A pair of arms 21 have a first arm 211 and a second arm 212. The first arm 211 and the second arm 212 are arranged on both sides of the central axis O1 in the length direction A of the clamp unit 100. In addition, the clamp 2 may have more than three arms.

[0080] The first arm 211 has a first claw 261, a flat gripping part 23, a sliding part 24 and a locking part 25 extending from the front end side A1 toward the base end side A2.

[0081] The second arm 212 has a second claw 262, a flat gripping part 23, a sliding part 24 and a locking part 25 extending from the front end side A1 toward the base end side A2.

[0082] Figure 4 This is a diagram of a pair of arms 21 in a closed state, viewed from the length direction A.

[0083] Here, the direction in which the first claw 261 and the second claw 262 are opposite when the pair of arms 21 are in the closed state is also called the "opposite direction C". In addition, the surface that passes through the central axis O1 and is parallel to the opening and closing direction B is also called the "opposite surface CS".

[0084] In this embodiment, the relative direction C is orthogonal to the opening and closing direction B of the pair of arms 21. However, the relative direction C may not be orthogonal to the opening and closing direction B, as long as it is a direction that intersects the opening and closing direction B. In this embodiment, the length direction A is orthogonal to the opening and closing direction B of the pair of arms 21. However, the length direction A may not be orthogonal to the opening and closing direction B, as long as it is a direction that intersects the opening and closing direction B.

[0085] The first claw 261 is a member capable of piercing the mucosa, located at the front end of the first arm 211, and extends inward (closed side) in the opening-closing direction B. The first claw 261 is formed by bending the front end of the first arm 211 inward in the opening-closing direction B. That is, a bent portion is formed between the first arm 211 and the first claw 261. In the closed state of the clamp 2, the first arm 211 extends along the length direction A, and the first claw 261 extends along the opening-closing direction B. The first claw 261 is formed with a pointed tip that gradually tapers inward in the opening-closing direction B. In this embodiment, viewed from the length direction A, the first claw 261 is formed as a right-angled triangle. However, viewed from the length direction A, the first claw 261 may not be formed as a right-angled triangle; for example, it may be formed as a triangle.

[0086] The outer surface (first outer surface) 261b of the first claw 261 in the opposite direction C (the side opposite to the second claw 262) has a plurality of first anchors 271. The plurality of first anchors 271 may extend from the first claw 261 outward in the opposite direction C, capable of piercing the mucosa. Specifically, the plurality of first anchors 271 are formed with a tapered tip that gradually tapers outward in the opposite direction C.

[0087] The outer surface 261b of the first claw 261 is inclined relative to the opening and closing direction B, and approaches the opposite surface CS as it moves toward the inner side (closing side) in the opening and closing direction B.

[0088] Multiple first anchors 271 are arranged along the opening and closing direction B on the outer surface 261b of the first claw 261. The more the multiple first anchors 271 are located on the inner side (closed side) in the opening and closing direction B, the longer the protrusion length from the outer surface 261b.

[0089] Figure 5 and Figure 6 This is a diagram showing a modified example of the first anchoring element 271.

[0090] Furthermore, the protruding lengths of the multiple first anchoring members 271 protruding from the outer side 261b can also be equal. Additionally, as... Figure 5 As shown, the protruding length of the plurality of first anchoring members 271 can also extend to the length housed within the cavity of the pressing member 3. Additionally, as... Figure 6 As shown, the protruding lengths of the plurality of first anchors 271 can also extend to the ends of the gripping portion 23 in the opposite direction C.

[0091] The second claw 262 is a member capable of piercing the mucosa, located at the front end of the second arm 212, and extends inward (closed side) in the opening-closing direction B. The second claw 262 is formed by bending the front end of the second arm 212 inward in the opening-closing direction B. That is, a bent portion is formed between the second arm 212 and the second claw 262. In the closed state of the clamp 2, the second arm 212 extends along the length direction A, and the second claw 262 extends along the opening-closing direction B. The second arm 212 is formed with a pointed tip that gradually tapers inward in the opening-closing direction B. In this embodiment, viewed from the length direction A, the second claw 262 is formed into a right-angled triangle shape. However, viewed from the length direction A, the second claw 262 may not be formed into a right-angled triangle shape; for example, it may be formed into a triangular shape.

[0092] The first claw 261 of the first arm 211 and the second claw 262 of the second arm 212 are formed in asymmetrical shapes with respect to the central axis O1. Therefore, when the user installs the clamp 2 onto the connecting member 4, it is easy to determine the orientation of the clamp 2 relative to the connecting member 4. In addition, the first claw 261 of the first arm 211 and the second claw 262 of the second arm 212 can also be formed in a symmetrical shape with respect to the central axis O1.

[0093] Figure 7 This is a diagram of a pair of arms 21 in a closed state, viewed from the opposite direction C.

[0094] In the opening / closing direction B, the length L1 of the first claw 261 is greater than the length L3 between the first arm 211 and the second arm 212 when the pair of arms 21 are in the closed state. Additionally, in the opening / closing direction B, the length L2 of the second claw 262 is greater than the length L3 between the first arm 211 and the second arm 212 when the pair of arms 21 are in the closed state.

[0095] Figure 8 This is a diagram of a pair of arms 21 in a closed state, viewed from the opening / closing direction B.

[0096] The first claw 261 and the second claw 262 are components for holding biological tissues. When the pair of arms 21 are in the closed state, the first claw 261 and the second claw 262 are not in contact. When the pair of arms 21 are in the closed state, there is a gap G between the first claw 261 and the second claw 262 in the opposite direction C.

[0097] Specifically, when the pair of arms 21 are in the closed state, the first inner surface 261a of the first claw 261 and the second inner surface 262a of the second claw 262 on the opposite direction C are positioned opposite each other across a facing surface CS that passes through the central axis O1 and is parallel to the opening / closing direction B. When the pair of arms 21 are in the closed state, the first inner surface 261a of the first claw 261 is parallel to the second inner surface 262a of the second claw 262.

[0098] In addition, when the pair of arms 21 are in the closed state, the first claw 261 and the second claw 262 are in the same position in the length direction A.

[0099] In the following description, without distinguishing between the first claw 261 and the second claw 262, the first claw 261 and the second claw 262 will also be referred to as "claw 26".

[0100] The sliding part 24 is the part that elastically deforms when a pair of arms 21 are pulled into the pressing member 3.

[0101] The engaging part 25 is a component that can engage with the fastening member 32 of the pressing member 3. The front end side A1 of the engaging part 25 is formed as an obtuse angle with the length direction A, and the base end side A2 of the engaging part 25 is formed as an acute angle with the length direction A.

[0102] The base end 28 connects the first arm 211 and the second arm 212. The first arm 211 and the second arm 212, connected by the base end 28, are positioned to open and close freely toward the front end side A1. The base end 28 is bent into a U-shape and connected to the hook 41f of the connecting member 4. The base end 28 is forceped in a manner that puts the pair of arms 21 into an open state. Therefore, the pair of arms 21 of the clamp 2 have a self-expanding force in the opening and closing direction B.

[0103] like Figure 3 As shown, the base end 28 is connected to the hook 41f of the connecting member 4 by inserting the hook 41f of the connecting member 4 into the base end 28, which is formed in the shape of the letter U.

[0104] Figure 9 It is a cross-sectional view along the length direction A of the pressing member 3.

[0105] The pressing member (tubular member) 3 is a cylindrical member capable of accommodating at least a portion of the clamp 2. The pressing member 3 has an internal space 38 for the clamp 2 to move in and out along the length direction A. The pressing member 3 can fix the clamp 2, which is pulled into the internal space 38, into a closed state. The pressing member 3 has a pressing tube 3A provided at the base end side A2 and a pressing guide tube 3B provided at the front end side A1.

[0106] The pressure tube (second tubular member) 3A has a pressure tube body 30 formed in a cylindrical shape, a protruding wing 31, and a fastening member 32.

[0107] The die-cast body 30 is formed by injection molding of a thermoplastic resin with moderate elasticity, such as PPA (polyphthalamide), PA (polyamide), PEEK (polyether ether ketone), or LCP (liquid crystal polymer), which is softer than the jig 2. Alternatively, the die-cast body 30 may be formed of metal instead of thermoplastic resin.

[0108] Submersible wing 31 is a pair of protrusions that protrude into the outer peripheral surface 30a of the pressure pipe body 30. The submersible wing 31 is positioned on both sides across the central axis O1. The basic posture of the submersible wing 31 is a protruding state that protrudes radially outward relative to the outer peripheral surface 30a. The submersible wing 31 is brought into a submerged state relative to the outer peripheral surface 30a by a force applied radially inward from the outer side of the R direction. By releasing this force, the submersible wing 31 returns to its protruding state from the submerged state.

[0109] The fastening member 32 is an annular member disposed in the internal space 38 of the pressure tube 3A. The fastening member 32 is made of metal. In addition, the fastening member 32 can be made as hard as possible than the pressure tube body 30, for example, it can be made of thermoplastic resin instead of metal.

[0110] The fastening member 32 is arranged such that its central axis coincides with the central axis O1. The fastening member 32 is positioned at a location A2 closer to the base end of the protruding wing 31. The fastening member 32 is assembled to the pressure tube body 30, for example, by means of insert forming. The fastening member 32 is positioned to protrude radially R from the inner circumference of the pressure tube body 30.

[0111] The pressing conduit (first tubular member) 3B is a cylindrical metal member. The pressing conduit 3B is pressed into the front end of the pressing tube 3A. The pressing tube 3A and the pressing conduit 3B can also be connected by heat fusion, bonding, or threaded fastening.

[0112] Figure 10 This is a three-dimensional view of connecting structural component 4.

[0113] The connecting member 4 is detachably connected to the base end 28 of the clamp 2. Furthermore, the connecting member 4 is detachably connected to the arrow hook portion 231 that passes through the sheath 220. That is, the connecting member 4 connects the clamp 2 and the arrow hook portion 231. The connecting member 4 includes an insertion portion 41 that is inserted into the internal space 38 of the pressing member 3 and a connecting portion 42 provided at the base end of the insertion portion 41.

[0114] The insertion part 41 has a hook 41f provided at the front end and a broken part 41b provided at the base end side A2 of the hook 41f. The hook 41f is a hook extending in a direction perpendicular to the central axis O1 and is formed into a generally cylindrical rod shape. The base end 28 of the clamp 2 is hooked onto the hook 41f.

[0115] The fracture portion 41b fractures when a tensile force of, for example, 20 N (Newtons) to 90 N is applied to the hook 41f by pulling the base end portion 28 toward the base end side A2. Furthermore, the fracture portion 41b only needs to have a mechanism to release the connection between the base end portion 28 of the clamp 2 and the hook 41f of the connecting member 4. For example, the fracture portion 41b could also be a mechanism that releases the connection between the base end portion 28 and the hook 41f by deformation (plastic deformation or elastic deformation) without fracture.

[0116] The connecting part 42 is an engaging part that engages (connects) with the arrow hook part 231 of the clamp guide device 200. The connecting part 42 has a connecting part body 43 and an elastic arm part 44.

[0117] An elastic arm 44 is provided at the base end of the connecting body 43 and branches into two strands. The elastic arm 44 can elastically deform relative to the connecting body 43 and can open and close relative to the connecting body 43. A notch 44m is formed in the elastic arm 44 for holding and accommodating the engaging portion 231a of the arrow hook portion 231. The notch 44m is formed to fit tightly against the outer peripheral surface of the engaging portion 231a of the arrow hook portion 231.

[0118] [Action and function of fixture unit 100]

[0119] Next, refer to Figures 11 to 21 The operation and function of the fixture unit 100 are explained.

[0120] Figure 11 This is a diagram showing the clamp unit 100 loaded into the clamp guide device 200.

[0121] The clamp unit 100 is loaded into the clamp guide device 200 using a box or the like. The connecting member 4 of the clamp unit 100 loaded into the clamp guide device 200 is connected to the arrow hook portion 231 that passes through the sheath 220. The submerged wing 31 is pressed into the submerged state by the inner circumferential surface of the sheath 220.

[0122] The pair of arms 21 of the loaded clamp unit 100 are pressed into a closed state by the inner circumferential surface of the sheath 220. The engaging part 25 is located at a position A1 closer to the front end of the fastening member 32, and the pair of arms 21 are not locked into a closed state.

[0123] Figure 12 This is a diagram showing the clamp unit 100 that has been introduced into the body.

[0124] The surgeon inserts the clamp unit 100, loaded in the sheath 220, into the body through the endoscope's channel. Next, the surgeon advances the arrow hook 231 by moving the slider 242 along the operating body 241. The surgeon advances the clamp unit 100 until the submersion wing 31 extends from the sheath 220. The submersion wing 31, by extending from the sheath 220, returns from a submerged state to a protruding state, its basic position.

[0125] A pair of arms 21 extend from the sheath 220 via the front end side, so that the clamp 2 moves towards the front end side relative to the pressing member 3 and returns to the open state by using the self-expanding force of the pair of arms 21 as the restoring force. Even when the pair of arms 21 return to the open state and protrude from the pressing member 3 to the maximum extent, the engaging part 25 is disposed in the internal region of the pressing member 3.

[0126] The surgeon moves the endoscope and sheath 220 so that the clamp 2 of the clamp unit 100 approaches the defect D, which is the treatment area. In the following description, the mucosa surrounding the edge of the defect D and the mucosa that is positioned opposite each other across the defect D are referred to as "first mucosa M1" and "second mucosa M2".

[0127] Figure 13 This is a diagram showing the clamp unit 100 holding the first mucosa M1.

[0128] The surgeon uses a pair of arms 21 to hold the first mucosa M1. The surgeon inserts the first claw 261 and the second claw 262 into the first mucosa M1.

[0129] Figure 14 This is a diagram showing the first mucosa M1 held by a pair of arms 21.

[0130] When the first claw 261 and the second claw 262 puncture the first mucosa M1, the mucosal tissue MZ is disposed in the gap G formed between the first claw 261 and the second claw 262. Therefore, the hole region R1 formed by the first claw 261 puncturing the first mucosa M1 is not connected to the hole region R2 formed by the second claw 262 puncturing the first mucosa M1.

[0131] The surgeon will pull the first mucosa M1, held by a pair of arms 21, toward the second mucosa M2. Because the first mucosa M1 is firmly held by the first claw 261 and the second claw 262, the surgeon can easily pull the first mucosa M1 toward the second mucosa M2.

[0132] Figure 15 This is a diagram showing the clamping unit 100 where the second claw 262 has been pulled out from the first mucosa M1. The surgical operator pulls the second claw 262 out of the first mucosa M1 in order to hold the second mucosa M2 using the second arm 212.

[0133] Figure 16 This is a diagram showing the first mucosa M1 after the second claw 262 has been pulled out.

[0134] Because no anchor is provided on the second claw 262, it is easy to pull out of the first mucosa M1. On the other hand, because the first anchor 271 is provided on the first claw 261, it is not easy to pull out of the first mucosa M1. In addition, because the hole region R1 and the hole region R2 are not connected, even after the second claw 262 is pulled out of the first mucosa M1, the hole region R1 does not connect with the hole region R2, and the hole region R1 does not expand. Therefore, the first claw 261 is not easy to pull out of the first mucosa M1. As a result, the surgeon can easily pull out the second claw 262 from the first mucosa M1 while the first claw 261 is punctured in the first mucosa M1.

[0135] Figure 17 This is a diagram showing the clamp unit 100 holding the second mucosa M2.

[0136] The surgeon uses the second arm 212 to hold the first mucosa M1. The surgeon inserts the second claw 262 into the second mucosa M2. As a result, the first mucosa M1 is held by the first arm 211, and the second mucosa M2 is held by the second arm 212.

[0137] Figure 18 This is a diagram showing a clamping unit 100 that closes a pair of arms 21.

[0138] The surgeon moves the slider 242 backward along the main body 241 of the operating section, thereby retracting the arrow hook 231. The connecting member 4, connected to the arrow hook 231, pulls the clamp 2. A pair of arms 21 with self-expanding force are pulled towards the base end side A2, thereby pushing the front opening 3a of the pressing member 3 towards the base end side A2. The protruding wing 31, in its protruding state, engages with the sheath 220 and is therefore not pulled into the interior of the sheath 220. Thus, the clamp 2, pulled by the connecting member 4, is pulled into the pressing member 3.

[0139] By using the connecting member 4 to pull the base end 28 of the clamp 2 towards the base end A2 of the pressing member 3, the pair of arms 21 are pulled into the pressing member 3, and the pair of arms 21 gradually close. If the traction force on the base end 28 is released in this state, the clamp 2 moves towards the front end A1 and returns to the open state by the self-expanding force of the pair of arms 21. The surgeon can then return the pair of arms 21 to the open state and re-grasp the tissue.

[0140] Figure 19 This is a diagram showing the clamp unit 100 where clamp 2 is locked.

[0141] The base end 28 is further pulled towards the base end side A2 of the pressing member 3, thereby pulling the engaging portion 25 into a position closer to the base end side A2 than the fastening member 32. Since the base end side A2 of the engaging portion 25 is formed with an obtuse angle, the engaging portion 25 is easily pulled into a position closer to the base end side than the fastening member 32. On the other hand, since the front end side A1 of the engaging portion 25 is formed with an acute angle, when the engaging portion 25 is pulled into a position closer to the base end side A2 than the fastening member 32, the engaging portion 25 engages with the fastening member 32. As a result, the movement of the clamp 2 relative to the pressing member 3 towards the front end side A1 is restricted, and the pair of arms 21 are locked in a closed state. When the pair of arms 21 are locked in a closed state, the pair of arms 21 cannot return to an open state.

[0142] Figure 20 This is a diagram showing the clamp unit 100 separated from clamp 2.

[0143] The surgeon further pulls on clamp 2. A fracture force of, for example, 20 N (Newtons) to 90 N is applied to hook 41f, causing fracture of portion 41b. The fracture strength of portion 41b is lower than that of the connecting body 43. Therefore, it is not the connecting body 43 that fractures, but portion 41b.

[0144] Figure 21 This is a diagram showing the clamp unit 100 after it has broken.

[0145] The surgeon retracts the sheath 220, leaving the clamp 2, which is in a ligated state, inside the body.

[0146] The operator uses a box or similar device to reload the new fixture unit 100 into the fixture import device 200.

[0147] According to the clamp conveying device 300 of this embodiment, the treatment of suturing and tightening the defective part D can be appropriately performed.

[0148] The first embodiment of the present invention has been described in detail above with reference to the accompanying drawings. However, the specific structure is not limited to this embodiment, and design changes that do not depart from the spirit of the present invention are also included. Furthermore, the constituent elements shown in the above embodiment and the variations shown below can be appropriately combined to form a configuration.

[0149] (Variation Example 1-1)

[0150] Figure 22 This is a diagram showing the second claw 262A, which is a variant of the second claw 262.

[0151] The second claw 262A has a plurality of second anchors 272 on its second outer surface 262b in the opposite direction C (the side opposite to the first claw 261). The second claw 262A is less likely to be pulled out of the mucosa compared to the second claw 262.

[0152] (Variations 1-2)

[0153] Figure 23 This diagram shows a modified example of the first claw 261B and the second claw 262B, which are variations of the first claw 261 and the second claw 262A. The first claw 261B has a plurality of third anchoring elements 273 on its first inner surface 261a. The plurality of third anchoring elements 273 extend from the first claw 261B toward the inner side in the opposite direction C, and are capable of piercing the mucosa. The second claw 262B has a plurality of fourth anchoring elements 274 on its second inner surface 262a. The plurality of fourth anchoring elements 274 extend from the second claw 262B toward the inner side in the opposite direction C, and are capable of piercing the mucosa.

[0154] (Variations 1-3)

[0155] Figure 24 and Figure 25 This diagram shows a modified example of the pressing member 3C and a modified example of the pair of arms 21C. The pair of arms 21C also has a protrusion 2p protruding outward in the opening / closing direction B at the sliding portion 24. The pressing member 3C has a slit 3s that engages with the protrusion 2p. The slit 3s is formed as a straight line along the length direction A. Therefore, the pair of arms 21C can move forward and backward without tilting relative to the length direction A. That is, the clamp 2 can maintain the gap G between the first claw 261 and the second claw 262 regardless of whether it is in the open or closed state. In other words, the positions of the first claw 261 and the second claw 262 are different in the relative direction C whether the clamp 2 is in the open or closed state. Figure 25As shown, the slit 3s can also be curved. In this case, the pair of arms 21C have protrusions 2p protruding outward in the opposite direction C at the sliding part 24. The protrusions 2p have a first part and a second part. The first part has a width smaller than the width of the slit 3s and slides inside the slit 3s. The second part is disposed on the outside of the pressing member 3C and has a width larger than the width of the slit 3s. By abutting against the pressing member 3 with the second part of the protrusion 2p, the movement of the first claw 261 and the second claw 262 toward each other in the opposite direction C is restricted. Therefore, the pair of arms 21C can move forward and backward without tilting relative to the length direction A. That is, the clamp 2 can maintain the gap G between the first claw 261 and the second claw 262 whether it is in the open state or the closed state. In other words, the positions of the first claw 261 and the second claw 262 are different in the opposite direction C whether the clamp 2 is in the open state or the clamp 2 is in the closed state.

[0156] (Variations 1-4)

[0157] Figure 26 and Figure 27 This diagram shows a modified example of the pressing member 3D and a modified example of the pair of arms 21D. The pressing member 3D also has an inwardly protruding protrusion 3p at the front opening 3a. The pair of arms 21D has a slit 2s that engages with the protrusion 3p. The slit 2s is formed as a straight line along the length direction A. Therefore, the pair of arms 21D can move forward and backward without tilting relative to the length direction A. That is, the clamp 2 can maintain the gap G between the first claw 261 and the second claw 262 regardless of whether it is in the open or closed state. In other words, the positions of the first claw 261 and the second claw 262 are different in the relative direction C when the clamp 2 is in the open state and when the clamp 2 is in the closed state. Figure 27 As shown, the protrusion 3p can also be a pin connecting the opposite inner surface of the front opening 3a.

[0158] (Second Implementation)

[0159] Reference Figures 28 to 30 The second embodiment of the present invention will be described. In the following description, structures that are common to those already described will be labeled with the same reference numerals and repeated descriptions will be omitted.

[0160] Figures 28 to 30 This is a diagram showing the clamp unit 100E of the second embodiment.

[0161] The clamp unit 100E includes a clamp 2E, a pressing member 3, and a connecting member 4. Furthermore, in... Figures 28 to 30 In the middle, the connecting structural component 4 is not shown.

[0162] The clamp 2E is formed by bending a sheet metal at its central portion. The clamp 2E has a pair of arms 21E that can open and close toward the front end side A1 and a base end 28 connecting the pair of arms 21E. The base end side A2 of the clamp 2E is inserted into the internal space 38 of the pressing member 3.

[0163] A pair of arms 21E has a first arm 211E and a second arm 212E. The first arm 211E and the second arm 212E are arranged on both sides of the central axis O1 in the length direction A of the clamp unit 100E. In addition, the clamp 2E may also have more than three arms.

[0164] The first arm 211E has a first claw 21a, a flat gripping part 23, a sliding part 24 and a locking part 25 extending from the front end side A1 toward the base end side A2.

[0165] The second arm 212E has a second claw 22a, a flat gripping part 23, a sliding part 24 and a locking part 25 extending from the front end side A1 toward the base end side A2.

[0166] like Figure 29 As shown, when the pair of arms 21E are in the closed state, the first claw 21a and the second claw 22a are opposite each other in the opening and closing direction B. That is, in this embodiment, when the pair of arms 21E are in the closed state, the relative direction C between the first claw 21a and the second claw 22a is the same as the opening and closing direction B. Furthermore, when the pair of arms 21E are in the closed state, the first claw 21a and the second claw 22a can also be in contact.

[0167] The first claw 21a has a right side and a left side in the left-right direction E, which is orthogonal to the opening and closing direction B. Right side anchoring members 21b and 21c protruding along the left-right direction E are provided on the right side of the first claw 21a. Left side anchoring members 21d and 21e protruding along the left-right direction E are provided on the left side of the first claw 21a.

[0168] The second claw 22a has a right side and a left side in the left-right direction E, which is orthogonal to the opening and closing direction B. Right side anchoring members 22b and 22c protruding along the left-right direction E are provided on the right side of the second claw 22a. Left side anchoring members 22d and 22e (not shown) protruding along the left-right direction E are provided on the left side of the second claw 22a.

[0169] When approaching the defect D at an angle, the right-side anchors 21b and 21c of the first arm 211E and the right-side anchors 22b and 22c of the second arm 212E contact the tissue before the first claw 21a and the second claw 22a. Therefore, the right-side anchors 21b, 21c, 22b, and 22c generate a large frictional force relative to the tissue, inhibiting slippage relative to the tissue. The same applies to the left-side anchors 21d and 21e of the first arm 211E and the left-side anchors 22d and 22e of the second arm 212E.

[0170] According to the clamp unit 100E of this embodiment, the treatment of suturing and tightening the defective part D can be appropriately performed.

[0171] The second embodiment of the present invention has been described in detail above with reference to the accompanying drawings. However, the specific structure is not limited to this embodiment, and design changes that do not depart from the spirit of the present invention are also included. Furthermore, the constituent elements shown in the above embodiment and the variations shown below can be appropriately combined to form a configuration.

[0172] (Variation Example 2-1)

[0173] Figure 31 This is a diagram showing fixture 2F, a variation of fixture 2E.

[0174] The right-side anchor 21c on the base side A2 of clamp 2F is longer than the right-side anchor 21b on the front side A1. Therefore, when approaching the defect D at an angle, both right-side anchors 21b and 21c easily come into contact with the tissue. Specifically, when clamp 2F approaches the defect D at an angle such that the right sides of the first claw 21a and the second claw 22a are opposite the defect D, the right-side anchors 21b, 21c, 22b, and 22c face the defect D. At this time, because the right-side anchor 21c is longer than the right-side anchor 21b, both right-side anchors 21b and 21c easily come into contact with the tissue simultaneously. This generates greater friction between the right-side anchors 21b, 21c, 22b, and 22c and the tissue, inhibiting the sliding of the first claw 21a and the second claw 22a relative to the tissue. The same applies to the left-side anchors 21d, 21e, 22d, and 22e.

[0175] (Variation Example 2-2)

[0176] Figure 32 This is a diagram showing fixture 2G, which is a variation of fixture 2E.

[0177] In the above embodiment, the number of anchors on one arm (e.g., right-side anchors 21b and 21c and left-side anchors 21d and 21e) is four. However, the number of anchors is not limited to this. For example, the number of anchors on one arm can also be as follows: Figure 32 As shown, there is one; there can also be two or three.

[0178] (Variations 2-3)

[0179] Figure 33 and Figure 34 This is a diagram showing fixture 2H, a variation of fixture 2E.

[0180] In the above embodiment, the anchoring elements (e.g., right-side anchoring elements 21b, 21c and left-side anchoring elements 21d, 21e) are disposed on the claw (e.g., the first claw 21a). However, the location of the anchoring elements is not limited to this. Figure 33 and Figure 34 As shown, at least a portion of the anchoring element can also be provided on the gripping portion 23 of the base end side A2 of the claw.

[0181] (Third implementation method)

[0182] Reference Figures 35 to 37 The third embodiment of the present invention will be described. In the following description, structures that are common to those already described will be labeled with the same reference numerals and repeated descriptions will be omitted.

[0183] Figures 35 to 37 This is a diagram showing the clamp unit 100I of the third embodiment.

[0184] The clamp unit 100I includes a clamp 2I, a pressing member 3, and a connecting member 4. Furthermore, in... Figures 35 to 37 In the middle, the connecting structural component 4 is not shown.

[0185] The clamp 2I is formed by bending a sheet metal at its central portion. The clamp 2I has a pair of arms 21I that can be opened and closed toward the front end side A1 and a base end 28 connecting the pair of arms 21I. The base end side A2 of the clamp 2I is inserted into the internal space 38 of the pressing member 3.

[0186] A pair of arms 21I has a first arm 211I and a second arm 212I. The first arm 211I and the second arm 212I are arranged on both sides of the central axis O1 in the length direction A of the clamp unit 100I. In addition, the clamp 2I may also have three or more arms.

[0187] The first arm 211I extends from the front end side A1 toward the base end side A2 and has a first claw 21a, inner side anchoring members 21f and 21g, a flat holding part 23, a sliding part 24, and a locking part 25.

[0188] The second arm 212I has a second claw 22a, inner side anchors 22f and 22g, a flat gripping part 23, a sliding part 24 and a locking part 25 extending from the front end side A1 toward the base end side A2.

[0189] The inner side anchors 21f and 21g are anchors provided on the inner side of the first claw 21a of the first arm 211I and the front end of the gripping part 23, and protrude toward the closed side in the opening and closing direction B. The inner side anchors 21f and 21g are arranged along the length direction A, and the inner side anchor 21f is positioned at a position A1 closer to the front end than the inner side anchor 21g.

[0190] The inner side anchors 22f and 22g are anchors provided on the inner side of the second claw 22a of the second arm 212I and the front end of the gripping part 23, and protrude toward the closed side in the opening and closing direction B. The inner side anchors 22f and 22g are arranged along the length direction A, and the inner side anchor 22f is positioned at a position A1 closer to the front end than the inner side anchor 22g.

[0191] Even when the pair of arms 21I is in the open state, the inner surface anchors 21f and 21g (inner surface anchors 22f and 22g) will still come into contact with the tissue when the pair of arms 21I is pressed against the biological tissue.

[0192] According to the clamp unit 100I of this embodiment, the treatment of suturing and tightening the defective part D can be appropriately performed.

[0193] The third embodiment of the present invention has been described in detail above with reference to the accompanying drawings. However, the specific structure is not limited to this embodiment, and design changes that do not depart from the spirit of the present invention are also included. Furthermore, the constituent elements shown in the above embodiment and the variations shown below can be appropriately combined to form a configuration.

[0194] (Variation Example 3-1)

[0195] Figure 38 This is a diagram showing fixture 2J as a variation of fixture 2I.

[0196] The inner surface anchor 21g on the base side A2 of clamp 2J is longer than the inner surface anchor 21f on the front side A1. Therefore, when approaching the defect D at an angle, and also when approaching the defect D from the front, the inner surface anchors 21f and 21g easily come into contact with the tissue. The same applies to the inner surface anchors 22f and 22g.

[0197] (Fourth Implementation)

[0198] Reference Figures 39 to 41 The fourth embodiment of the present invention will be described. In the following description, structures that are common to those already described will be labeled with the same reference numerals and repeated descriptions will be omitted.

[0199] Figures 39 to 41 This is a diagram showing the clamping unit 100K according to the fourth embodiment.

[0200] The clamp unit 100I includes a clamp 2K, a pressing member 3, and a connecting member 4. Furthermore, in... Figures 39 to 41 In the middle, the connecting structural component 4 is not shown.

[0201] The clamp 2K is formed by bending a sheet metal at its central portion. The clamp 2K has a pair of arms 21K that can be opened and closed toward the front end side A1 and a base end 28 connecting the pair of arms 21K. The base end side A2 of the clamp 2K is inserted into the internal space 38 of the pressing member 3.

[0202] A pair of arms 21K has a first arm 211K and a second arm 212K. The first arm 211K and the second arm 212K are arranged on both sides of the central axis O1 in the length direction A of the clamping unit 100K. In addition, the clamp 2K may also have three or more arms.

[0203] The first arm 211K extends from the front end side A1 toward the base end side A2 and has a first claw 21a, an inner surface anchor 21h, a flat holding part 23, a sliding part 24, and a locking part 25.

[0204] The second arm 212K has a second claw 22a, an inner surface anchor 22h, a flat gripping part 23, a sliding part 24, and a locking part 25 extending from the front end side A1 toward the base end side A2.

[0205] The inner side anchor (pin) 21h is an anchor provided on the inner side of the first claw 21a of the first arm 211K and protruding toward the closed side in the opening / closing direction B. The inner side anchor 21h is formed in a conical shape, and its front end is sharper than that of the inner side anchor 21f in the third embodiment.

[0206] The inner side anchor (pin) 22h is an anchor provided on the inner side of the second claw 22a of the second arm 212K and protruding toward the closed side in the opening / closing direction B. The inner side anchor 22h is formed in a conical shape, and its front end is sharper than that of the inner side anchor 22f in the third embodiment.

[0207] like Figure 40 As shown, when the pair of arms 21K are in the closed state, the inner side anchor 21h and the inner side anchor 22h intersect. Specifically, when the pair of arms 21K are in the closed state, the position of the inner side anchor 21h of the first arm 211K and the position of the inner side anchor 22h of the second arm 212K are slightly offset in the left-right direction E, which is orthogonal to the opening and closing direction B. When viewed from the left-right direction E, the inner side anchor 21h and the inner side anchor 22h intersect.

[0208] When the pair of arms 21K are pressed onto the biological tissue, the inner surface anchor 21h (inner surface anchor 22h) contacts the tissue before the first claw 21a (second claw 22a). The inner surface anchor 21h (inner surface anchor 22h) penetrates the tissue. As a result, a large frictional force is generated between the first claw 21a (second claw 22a) and the tissue, inhibiting the sliding of the first claw 21a (second claw 22a) relative to the tissue.

[0209] According to the clamp unit 100K of this embodiment, the treatment of suturing and tightening the defective part D can be appropriately performed.

[0210] The fourth embodiment of the present invention has been described in detail above with reference to the accompanying drawings. However, the specific structure is not limited to this embodiment, and design changes that do not depart from the spirit of the present invention are also included. Furthermore, the constituent elements shown in the above embodiment and the variations shown below can be appropriately combined to form a configuration.

[0211] (Variation Example 4-1)

[0212] Figure 42 The diagram shows inner surface anchors 21i and 22i, which are variations of inner surface anchors 21h and 22h. The inner surface anchor 21i has a hook 21Fi extending from the front end of the inner surface anchor body 21Bi toward the first arm 211K. The angle between the inner surface anchor body 21Bi and the hook 21Fi can be acute. When the inner surface anchor 21i penetrates the tissue, the hook 21Fi hooks onto the tissue. This inhibits the sliding of the first claw 21a relative to the tissue.

[0213] The inner surface anchor 22i has a hook 22Fi extending from the front end of the inner surface anchor body 22Bi toward the second arm 212K. The angle formed between the inner surface anchor body 22Bi and the hook 22Fi can be an acute angle. When the inner surface anchor 22i penetrates the tissue, the hook 22Fi hooks onto the tissue. This inhibits the second claw 22a from sliding relative to the tissue.

[0214] (Variation A)

[0215] Figure 43 This is a diagram showing a modified example of clamp 2L.

[0216] The first claw 261L and the second claw 262L, located at the front end of the clamp 2L, are formed into a curved shape that bends inward toward the opening / closing direction B. In the closed state of the clamp 2L, the first claw 261L and the second claw 262L are offset from each other in the length direction A and do not engage. In the open state of the clamp 2L, the first claw 261L and the second claw 262L contact the tissue at approximately 90 degrees.

[0217] (Variation B)

[0218] Figure 44 This diagram shows a modified example of the first claw 261M and the second claw 262M, which are first claw 261 and second claw 262 respectively. The first claw 261M and the second claw 262M have a locking mechanism that locks in place when engaged.

[0219] (Variation C)

[0220] Figure 45This diagram shows a modified example of the first claw 261N and the second claw 262N, which are the first claw 261 and the second claw 262, respectively. The first claw 261N has two claws arranged in a direction perpendicular to the opening / closing direction B. The second claw 262N also has two claws arranged in a direction perpendicular to the opening / closing direction B.

[0221] (Variation D)

[0222] Figure 46 This diagram shows a modified example of the first claw 261O and the second claw 262O, which are the first claw 261 and the second claw 262, respectively. The first claw 261O has three claws arranged in a direction perpendicular to the opening and closing direction B. The second claw 262O has three claws arranged in a direction perpendicular to the opening and closing direction B.

[0223] Industrial availability

[0224] This invention can be applied to fixture units, etc.

[0225] Explanation of reference numerals in the attached figures

[0226] 300, Fixture conveying device (fixture system); 200, Fixture guiding device (feeder); 100, 100E, 100I, 100K, Fixture unit; 2, 2E, 2F, 2G, 2H, 2I, 2J, 2K, 2L, Fixture; 21, 21C, 21D, 21E, 21I, 21K, Arm; 211, 211E, 211I, 211K, First arm; 212, 212E, 212I, 212K, Second arm; 21a, First claw; 21b, Right side anchor; 21c, Right side anchor; 21d 21e, Left side anchor; 21f, Inner side anchor; 21g, Inner side anchor; 21h, Inner side anchor (pin); 21h, Inner side anchor; 21i, Inner side anchor; 21Bi, Inner side anchor body; 21Fi, Hook; 22a, Second claw; 22b, Right side anchor; 22c, Right side anchor; 22d, Left side anchor; 22e, Left side anchor; 22f, Inner side anchor; 22g, Inner side anchor; 22h, Inner side anchor (pin); 22h 22i, inner side anchor; 22Bi, inner side anchor body; 22Fi, hook; 23, gripping part; 24, sliding part; 25, engaging part; 26, claw; 261, 261B, 261L, 261M, 261N, 261O, first claw; 261a, first inner side; 261b, outer side (first outer side); 262, 262A, 262B, 262L, 262M, 262N, 262O, second claw; 262a, second inner side; 262b, second outer side; 271, the... 1. Anchoring component; 272. Second anchoring component; 273. Third anchoring component; 274. Fourth anchoring component; 28. Base end; 3, 3C, 3D. Pressing component (tubular component); 3A. Pressing tube (second tubular component); 3B. Pressing guide tube (first tubular component); 30. Pressing tube body; 30a. Outer peripheral surface; 31. Submerged wing; 32. Fastening component; 38. Internal space; 4. Connecting component; 41. Insertion part; 41b. Fracture part; 41f. Hook; 42. Connecting part; 43. Connecting part body; 44. Elastic arm part; 44m. Notch part.

Claims

1. A clamping unit, wherein, This fixture unit has: The clamp has a first arm and a second arm that can open and close toward the front end; and A tubular member capable of receiving at least a portion of the clamp. The first arm has a first claw at its front end that extends toward the closed side in the opening and closing direction. The first claw has a first anchor.

2. The clamping unit according to claim 1, wherein, The first claw is capable of piercing the mucous membrane and is formed into a pointed shape that gradually tapers towards the closed side in the opening and closing direction.

3. The clamping unit according to claim 1, wherein, The first anchor extends in a direction that intersects the opening and closing direction.

4. The clamping unit according to claim 3, wherein, The first anchor extends from the first claw along the length of the first arm.

5. The clamping unit according to claim 3, wherein, The second arm has a second claw at its front end that extends toward the closed side in the opening and closing direction. When the first arm and the second arm are in the closed state, the first claw and the second claw are facing each other in opposite directions. The first anchor extends from the first claw in the opposite direction.

6. The clamping unit according to claim 5, wherein, The first claw extends outward in the opposite direction.

7. The clamping unit according to claim 1, wherein, The second arm has a second claw at its front end that extends toward the closed side in the opening and closing direction. When the first arm and the second arm are in the closed state, the first claw and the second claw are facing each other in opposite directions. The first claw and the second claw form a gap in the opposite direction.

8. The clamping unit according to claim 7, wherein, When the first arm and the second arm are in the closed state, the first inner surface of the first claw in the opposite direction is configured opposite to the second inner surface of the second claw in the opposite direction. The first inner surface and the second inner surface are flat.

9. The clamping unit according to claim 8, wherein, When the first arm and the second arm are in the closed state, the first inner surface and the second inner surface are arranged in parallel.

10. The clamping unit according to claim 8, wherein, The second claw has a second anchor extending outward toward the opposite direction.

11. The clamping unit according to claim 7, wherein, The clamping unit has a slit extending along the length of the tubular member. The first arm and the second arm are restricted from moving in the opposite direction by the slit to form the gap between the first claw and the second claw.

12. The clamping unit according to claim 11, wherein, The slit is provided in the tubular member. The first arm and the second arm have protrusions that can engage with the slit. The protrusion extends radially outward toward the tubular member.

13. The clamping unit according to claim 11, wherein, The slit is provided in the first arm and the second arm. The tubular member has a protrusion that can engage with the slit. The protrusion extends radially inward toward the tubular member.

14. The clamping unit according to claim 1, wherein, In the opening and closing direction, the length of the first claw is greater than the length between the first arm and the second arm when the first arm and the second arm are in the closed state.

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