Clamp assembly and surgical instrument using same

Abstract

Provided is a clamp assembly capable of improving the closing force of a clamp. The clamp assembly is provided with: a pair of clamps (15) that open and close to each other; a support part (13) that rotatably supports the pair of clamps (15) and makes it possible to open and close the clamps (15); and a movable member (17) which is coupled to the pair of clamps (15) so as to be rotatable relative to the pair of clamps (15) and which is capable of reciprocating relative to the support section (13), the support section (13) comprising recesses (25) which are open on both sides in the direction intersecting the reciprocating direction of the movable member (17). Each of the pair of clamps (15) includes a rotating shaft portion (31) that engages with the recessed portion (25) so as to be rotatable about an axis from the outside in the intersecting direction.

Description

Technical Field

[0001] The present invention relates to a clamp assembly for a robot or a manipulator, etc., and a surgical instrument using such a clamp assembly. Background Art

[0002] As a conventional clamp (jaw) assembly, for example, as in Patent Document 1, there is a clamp assembly in which a pair of clamps that open and close with each other are rotatably supported by a pin on a sleeve.

[0003] In the clamp assembly, reciprocating wires are respectively coupled to the pair of clamps, and by reciprocating the wires, the pair of clamps can be rotated around the pin to open and close.

[0004] Moreover, the coupling portion between the clamp, which is the force point, and the wire can be provided at a distance from the rotation center, which is the fulcrum, i.e., the pin, so that the force acting between the clamps can be increased corresponding to the operation of the wire.

[0005] However, in the clamp assembly, there is a limit to the position where the pin can be disposed, and there is also a limit to the increase in the force acting between the clamps.

[0006] Prior Art Documents

[0007] Patent Documents

[0008] Patent Document 1: Japanese Patent Application Laid-Open No. 2020-508825 Summary of the Invention

[0009] Problems to be Solved by the Invention

[0010] The problem to be solved is that there is a limit to the increase in the force acting between the clamps.

[0011] Technical Means for Solving the Problem

[0012] The present invention provides a clamp assembly including: a pair of clamps that open and close with each other; a support portion that rotatably supports at least one of the pair of clamps to enable the opening and closing; and a movable member that is rotatably coupled to at least one of the pair of clamps rotatably supported by the support portion and is capable of relatively reciprocating movement with respect to the support portion, the support portion including a concave portion that opens at an edge in a direction intersecting the reciprocating movement direction of the movable member, and at least one of the pair of clamps rotatably supported by the support portion including a rotation shaft portion that is rotatably engaged with the concave portion from the outside in the intersecting direction.

[0013] Moreover, the present invention provides a surgical instrument using the clamp assembly.

[0014] Effects of the Invention

[0015] According to the present invention, the force acting between the clamps can be increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Figure 1 is a front view of the forceps as a surgical instrument using the clamp assembly of Example 1 of the present invention.

[0017] Figure 2 Figure 2 is a perspective view showing the Figure 1 clamp assembly of the forceps in a closed state.

[0018] Figure 3 Figure 3 is a perspective view showing the Figure 2 clamp assembly of the forceps in an open state.

[0019] Figure 4 Figure 4 is Figure 2 a perspective exploded view of the clamp assembly.

[0020] Figure 5 Figure 5 is a front view showing the relationship between the rotation center of the clamp and the protrusion of the Figure 2 clamp assembly.

[0021] Figure 6 Figure 6 (A) to Figure 6 (C) of Figure 2 is a perspective view showing the opening and closing of the clamp assembly.

[0022] Figure 7 Figure 7 (A) to Figure 7 (C) of Figure 2 is a front view showing the opening and closing of the clamp assembly.

[0023] Figure 8 Figure 8 is a perspective view of a part of the clamp assembly of Example 2 of the present invention.

[0024] Figure 9 Figure 9 (A) of Figure 9 and Figure 8 (B) of

[0025] Figure 10 Figure 10 (A) to Figure 10 ​​​​​​​​​​​​​​​​​​​​(C) shows the closed state of the clamp assembly of Embodiment 3 of the present invention. Figure 10 (A) of is a perspective view. Figure 10 (B) of is a front view and Figure 10 (C) of is a side view.

[0026] Figure 11 Figure 11 (A) to Figure 11 (C) of indicates Figure 10 (A) to Figure 10 (C) of the open state of the clamp assembly. Figure 11 (A) of is a perspective view. Figure 11 (B) of is a front view and Figure 11 (C) of is a side view. Detailed implementation manner

[0027] The following structure is adopted to achieve the purpose of increasing the force acting between the clamps.

[0028] As shown in the figure, the clamp assembly 7 includes a pair of clamps 15, a support portion 13, and a movable member 17.

[0029] The pair of clamps 15 are members that open and close with each other. The support portion 13 rotatably supports at least one of the pair of clamps 15 to enable the opening and closing of the pair of clamps 15. The movable member 17 is a member that is rotatably coupled to at least one of the pair of clamps 15 rotatably supported by the support portion 13 and is relatively reciprocally movable with respect to the support portion 13.

[0030] In the case of single-opening of the pair of clamps 15, it is only necessary to rotatably couple only one of them to the support portion 13. In the case of double-opening, it is only necessary to rotatably couple both of them to the support portion 13.

[0031] The support portion 13 includes a recess 25 that opens at the edge in a direction crossing the reciprocating movement direction of the movable member 17. At least one of the pair of clamps 15 rotatably supported by the support portion 13 respectively includes a rotating shaft portion 31 that rotatably engages with the recess 25 from the outside in the crossing direction of the recess 25.

[0032] The clamp assembly 7 can be configured as a cam type or a link type, etc. In the case of the cam type, it includes a cam portion 19. The cam portion 19 is provided between the support portion 13 and at least one of the pair of clamps 15 rotatably supported by the support portion 13, and rotates at least one of the pair of clamps 15 rotatably supported by the support portion 13 corresponding to the reciprocating movement of the movable member 17 to open and close the pair of clamps 15. The engagement of the rotating shaft portion 31 with the recess 25 can also be maintained by the cam portion 19.​​

[0033] At least one of the clamps 15 rotatably supported by the support portion 13 may also be such that the rotation center RC and the joint portion with the movable member 17 are disposed at intervals in the crossing direction with respect to the reciprocating movement direction of the movable member 17 at least in the closed state of the pair of clamps 15. In this case, the rotation center RC and the joint portion of each clamp 15 may also be located on the opposite sides in the crossing direction with the opening / closing center OC of the pair of clamps 15 interposed therebetween.

[0034] It may also be that the movable member 17 includes one of a pair of openings 17a and a joint portion, i.e., a protrusion 33, and each of the pair of clamps 15 includes the other of the opening 17a and the protrusion 33 that engages with one of the pair of openings 17a and the protrusion 33.

[0035] It may also be that the opening 17a is a long hole that enables relative movement of the protrusion 33 in the crossing direction, and permits detachment / attachment of the rotary shaft portion 31 with respect to the recess 25 before the engagement of the rotary shaft portion 31 with the recess 25 is held.

[0036] The clamp assembly 7 can be applied to various robots or manipulators, for example, it can be used for surgical instruments.

[0037] Example 1

[0038] [Pliers]

[0039] Figure 1 Fig. is a front view of pliers as a surgical instrument using the clamp assembly of Example 1 of the present invention.

[0040] The pliers 1 of this example are surgical instruments used for a surgical support robot or a surgical support manipulator, etc., and include a shaft 3, a bending portion 5, and a clamp assembly 7.

[0041] In addition, in this example, as an example of a surgical instrument, the pliers 1 are shown, but as long as the clamps 15 are opened and closed as described later, for example, it can be a surgical instrument having various functions such as grasping, peeling, and cutting. Moreover, the clamp assembly 7 can be applied to machines such as robots or manipulators having various functions such as grasping, peeling, and cutting in addition to surgical instruments.

[0042] The shaft 3 is formed in a cylindrical shape and is rotatably coupled to, for example, a surgical support robot or a surgical support manipulator. A bending portion 5 is provided at the front end of the shaft 3. In addition, the shape of the shaft 3 is not particularly limited.

[0043] The bending part 5 has a joint function and is the part that enables the bending and extension of the pliers 1. The bending part 5 of this embodiment is the part where a plurality of corrugated washers 5a are stacked axially and held in a stacked state by welding or the like. In addition, as long as the bending part 5 can be bent or extended, it is not particularly limited, and it may also be a disc spring or a bellows, etc. The axial direction refers to the direction along the axis of the pliers 1.

[0044] The bending part 5 allows the pulling wire 9 to be inserted axially at a circumferential specified interval, and the bending and extension are performed by the operation of the pulling wire 9. The circumferential direction refers to the direction along the outer circumference of the pliers 1. Inside the bending part 5, a core material (not shown) that suppresses axial compression or an operating member 11 (refer to Figure 4 ) that opens and closes the clamp 15 described later is provided.

[0045] The operating member 11 is a push-pull cable that reciprocates the movable member 17 described later axially. In addition, as long as the operating member 11 reciprocates the movable member 17, it may also be an air tube or the like.

[0046] The clamp assembly 7 is supported at the front end of the bending part 5.

[0047] Figure 2 It is a perspective view showing Figure 1 the closed state of the clamp assembly of the pliers, Figure 3 and is a perspective view showing Figure 1 the open state of the clamp assembly of the pliers. Figure 4 It is Figure 2 the exploded perspective view of the clamp assembly. Figure 5 It is a front view showing Figure 2 the relationship between the rotation center of the clamp of the clamp assembly and the protrusion. Figure 6 From (A) to Figure 6 In (C) of Figure 2 it is a perspective view showing the opening and closing of the clamp assembly of the pliers, Figure 7 From (A) to Figure 7 In (C) of Figure 2 it is a front view showing the opening and closing of the clamp assembly of the pliers. In addition, Figure 6 In (A) to Figure 7 In (C) of

[0048] The clamp assembly 7 includes a support part 13, a pair of clamps 15, a movable member 17, and a cam part 19.

[0049] The support part 13 is coupled to the bending part 5, as Figures 2 to 4In this way, a pair of clamps 15 are rotatably supported so that they can open and close. The pair of clamps 15 in this embodiment are arranged to open in opposite directions and are both supported by the support portion 13. The support portion 13 is integrally formed in a cylindrical shape, but there is no particular limitation. In the support portion 13, a slit 21 is provided on the front end side in the axial direction, and on one side and the other side in the radial direction (hereinafter referred to as the first radial direction) across the slit 21, support wall portions 23 for supporting the clamps 15 are defined.

[0050] The support portion 13 has recesses 25 that open on both sides in the radial direction (hereinafter referred to as the second radial direction) along the slit 21. In addition, the second radial direction is orthogonal to the first radial direction when viewed from above. The radial direction refers to the direction along the diameter of the pliers 1 and is the crossing direction with respect to the reciprocating movement direction of the movable member 17.

[0051] The recesses 25 are respectively provided in the support wall portions 23 and, when viewed from the front in the first radial direction, are formed in a reverse fan shape, especially a semicircular shape. In these recesses 25, the chord of the fan shape (the diameter of the semicircular shape) is located on the side edge in the second radial direction of the support wall portion 23 and opens outward.

[0052] The inner surface of the recess 25 corresponds to the outer peripheral shape of the support portion 13 and gradually becomes larger in the first radial direction from the side edge of the support wall portion 23 toward the inside in the second radial direction. In addition, the shape of the recess 25 is arbitrary as long as it can rotatably support a later-described rotary shaft portion 31 around the axis.

[0053] A pair of clamps 15 open and close with each other as shown in Figures 2 to 7 (C) of this embodiment, and in this embodiment, they are configured as gripping jaws that perform a gripping action through a closing operation. These clamps 15 are formed in the same shape, and the front and back in the first radial direction are arranged oppositely. However, the clamps 15 do not have to be in the same shape and sometimes have different shapes. Each clamp 15 includes a body portion 27, an arm 29, and a rotary shaft portion 31.

[0054] The body portion 27 is formed in a rod shape and is the part that performs the opening and closing action. The body portion 27 has a wave-shaped engaging portion 27a that engages with each other in the second radial direction in the closed state. At the bottom end in the axial direction of the body portion 27, a rotary shaft portion 31 is provided via the arm 29.

[0055] The arm 29 is formed in a plate shape, and the thickness in the first radial direction is smaller than that of the body portion 27. The arm 29 protrudes from the bottom end of the body portion 27 in the axial direction and also protrudes from the engaging portion 27a in the second radial direction, which is the crossing direction. The arm 29 enters the slit 21 of the support portion 13.

[0056] A rotary shaft portion 31 is provided on one side in the second radial direction of the arm 29, and a protrusion 33 is provided on the other side in the second radial direction of the arm 29. Moreover, between the rotary shaft portion 31 and the protrusion 33, a cam groove 37 of a later-described cam portion 19 is provided.

[0057] The rotating shaft portion 31 is formed in a fan shape, particularly a semicircular shape, when viewed from the front in the first radial direction. The semicircular rotating shaft portion 31 is engaged with the concave portion 25 of the semicircular support portion 13 from the outside in the second radial direction. Thus, the rotating shaft portion 31 is rotatably supported by the concave portion 25 through sliding around the axis. In addition, as long as the structure of the rotating shaft portion 31 is rotatably supported by the concave portion 25 through sliding around the axis, it may also be other shapes such as a rod shape. The engaging state of the rotating shaft portion 31 of the clamp 15 with respect to the concave portion 25 of the support portion 13 is maintained by the cam portion 19 as described later.

[0058] Similar to the concave portion 25, the rotating shaft portion 31 has a gradually increasing dimension in the first radial direction from both side edges of the support wall portion 23 toward the inside in the second radial direction. In this embodiment, the rotating shaft portion 31 has the same semicircular curvature radius and the depth in the second radial direction as the concave portion 25. Therefore, the rotation center RC is located at the side edge in the second radial direction of the support portion 13.

[0059] In addition, by making the concave portion 25 shallower in the second radial direction in relation to the rotating shaft portion 31, the rotation center RC can be located outside the support portion 13 in the second radial direction. In this embodiment, by making the central angle of the concave portion 25 smaller than the central angle of the rotating shaft portion 31, the concave portion 25 can be made shallower.

[0060] Conversely, by making the concave portion 25 deeper in the second radial direction in relation to the rotating shaft portion 31, the rotation center RC can be located outside the support portion 13 in the second radial direction. In this embodiment, by making the central angle of the concave portion 25 larger than the central angle of the rotating shaft portion 31, the concave portion 25 can be made deeper.

[0061] Therefore, by setting the concave portion 25 and the rotating shaft portion 31, the position of the rotation center RC can be easily set.

[0062] The protrusion 33 is a joint portion with respect to the movable member 17 described later. The protrusion 33 of this embodiment protrudes from the surface of the arm 29 on the opposite side of the rotating shaft portion 31 in the first radial direction. The shape of the protrusion 33 is cylindrical, but there is no particular limitation.

[0063] The protrusion 33 is provided at a distance in the second radial direction with respect to the rotation center RC in the closed state of the pair of clamps 15. In this embodiment, it is located on the opposite side of the rotation center RC across the opening / closing center OC ( Figure 7 of (B)). The opening / closing center OC is the position that becomes the center when setting the opening / closing angle of the body portion 27 of the clamp 15, and is located at the center in the second radial direction of the support portion 13 in this embodiment.

[0064] The opening and closing operation of the clamp 15 is performed through the movable member 17 via the protrusion 33.

[0065] The movable member 17 is rotatably coupled to both of the pair of clamps 15 and is relatively reciprocally movable with respect to the support portion 13. The movable member 17 is formed in a plate shape and is disposed between the arms 29 of the clamp 15 in the first radial direction.

[0066] In the movable member 17, a pair of openings 17a penetrating in the first radial direction are provided. The openings 17a are arranged in the second radial direction and the protrusions 33 of the clamp 15 are respectively inserted in the first radial direction. Alternatively, the protrusions 33 may be provided on the movable member 17 and the openings 17a may be provided on the clamp 15. Therefore, it is sufficient to provide one of the protrusions 33 and the openings 17a on the movable member 17 and the other of the protrusions 33 and the openings 17a on the clamp 15.

[0067] The opening 17a in this embodiment is a long hole that is long in the second radial direction. As a result, the opening 17a enables relative movement of the protrusion 33 in the second radial direction and allows the rotation shaft portion 31 to be disengaged from and engaged with the concave portion 25 before the engagement of the rotation shaft portion 31 with the concave portion 25 is held. Therefore, when the rotation shaft portion 31 is engaged with the concave portion 25, the protrusion 33 is inserted into the opening 17a in advance and the protrusion 33 is moved in the second radial direction within the opening 17a, thereby enabling the operation to be easily performed.

[0068] In the movable member 17, a cylindrical connection portion 17b connected to the operation member 11 is integrally provided. Through the connection portion 17b, the movable member 17 is connected to the operation member 11 and can reciprocally move through the operation member 11.

[0069] Through the reciprocating movement, the movable member 17 causes a force about the rotation center RC to act on the clamp 15 via the protrusion 33 as a coupling portion. At this time, the rotation center RC has a shape in which the rotation shaft portion 31 of the clamp 15 is engaged with the concave portion 25 of the support portion 13 from the outside in the second radial direction, so that the distance L between the protrusion 33 and the rotation center RC can be increased and the rotational force of the clamp 15 can be increased. As a result, the force acting between the pair of clamps 15 corresponding to the operation can be increased.

[0070] In this embodiment, the rotation center RC is located at the second radial side edge of the support portion 13, which can suppress the enlargement of the second radial pliers 1 or the clamp assembly 7 and can also locate the rotation center RC as far outside as possible.

[0071] Cam portions 19 are respectively provided between the support portion 13 and the pair of clamps 15, and the pair of clamps 15 are rotated to be opened and closed corresponding to the reciprocating movement of the movable member 17.

[0072] The cam portion 19 can adopt various forms. However, in this embodiment, it includes a cam pin 35 mounted on the support portion 13 and a cam groove 37 provided in each clamp 15.

[0073] The cam pin 35 is mounted in a through hole 39 of the support portion 13, and its front end protrudes in the first radial direction into the slit 21 of the support portion 13. Inside the slit 21, the front end of the cam pin 35 is engaged into the cam groove 37. The cam pin 35 has a cylindrical shape, but is not particularly limited.

[0074] The cam groove 37 is provided in the arm 29 of each clamp 15. The cam groove 37 is formed in an arc shape around the rotation center RC. In addition, the cam groove 37 includes a recess, but it can also be a through hole. By the relative movement of the cam pin 35 along the cam groove 37, the clamp 15 performs an opening and closing action.

[0075] Moreover, the cam groove 37 and the cam pin 35 of the cam portion 19 restrict the movement of the clamp 15, so that the engagement of the rotary shaft portion 31 with the recess 25 can be maintained. Therefore, there is no need to separately maintain the engagement of the rotary shaft portion 31 with the recess 25, and the simplification of the structure can be achieved.

[0076] In addition, in the case where the protrusion 33 and the rotation center RC are separated in the second radial direction as in this embodiment, the cam portion 19 can also be omitted. At this time, the engagement state between the rotary shaft portion 31 of the clamp 15 and the recess 25 of the support portion 13 can also be performed by the movable member 17.

[0077] [Operation]

[0078] The pliers 1 of this embodiment can open and close the clamp 15 by reciprocating the movable member 17 in the axial direction via the operating member 11 as shown in (A) to (C) of Figure 6 Figure 7

[0079] Specifically, as shown in (A) of Figure 6 Figure 7 Figure 6 Figure 6 Figure 7 Figure 7

[0080] At this time, since the rotation center RC and the protrusion 33 are arranged to be separated from each other in the second radial direction, a pair of clamps 15 are subjected to a force in the opening direction around the rotation center RC. Furthermore, due to the action of the cam portion 19, a pair of clamps 15 are more surely subjected to a force in the opening direction around the rotation center RC. As a result, a pair of clamps 15 rotate with respect to the rotation center RC, and thus the body portions 27 are opened.

[0081] In the present embodiment, since the rotation shaft portion 31 of the clamp 15 is engaged with the concave portion 25 of the support portion 13 from the outside in the second radial direction, the distance between the protrusion 33 and the rotation center RC can be increased, and the rotational force of the clamp 15 can be improved. As a result, the opening force acting between the pair of clamps 15 with respect to the operating force of the movable member 17 can be increased.

[0082] Similarly, when, as shown in (B) of Figure 6 and (C) of Figure 6 and (B) of Figure 7 and (C) of Figure 7 , when the movable member 17 located at the access position biased toward the opposite side of the bending portion 5 in the axial direction is retracted toward the bending portion 5 in the open state of the clamp 15, as shown in (A) of Figure 6 and (B) of Figure 6 and (A) of Figure 7 and (B) of Figure 7 , a pair of clamps 15 rotate with respect to the rotation center RC, and thus the body portions 27 are closed. At this time, the rotational force of the clamp 15 can be increased, and thus the closing force acting between the pair of clamps 15 with respect to the operating force of the movable member 17 can be increased.

[0083] Therefore, in the pliers 1, grasping by the clamp 15 can be surely performed with a small operating force.

[0084] Embodiment 2

[0085] Figure 8 is a perspective view showing a part of the clamp assembly according to Embodiment 2 of the present invention. Figure 9 In (A) of Figure 9 and (B) of Figure 8 , perspective views of the clamp of the clamp assembly are shown from the front side and the back side, respectively. In addition, in Embodiment 2, the same reference numerals are given to the structures corresponding to those in Embodiment 1, and redundant descriptions are omitted.

[0086] In the present embodiment, the cam pin 35 of the cam portion 19 is omitted, and the protrusion 33 functions as the cam pin 35.

[0087] That is, on the arm 29 of the clamp 15, a rotation shaft portion 31 is provided on one side in the second radial direction, and on the other side in the second radial direction, a protrusion 33 is provided on a surface opposite to the surface provided with the rotation shaft portion 31 in the first radial direction. Further, on the same surface as the protrusion 33, a cam groove 37 of the cam portion 19 is provided on one side in the second radial direction of the arm 29.

[0088] The cam groove 37 is formed in an arc shape around the rotation center RC of the target clamp 15. The front end of the protrusion 33 of the target clamp 15 is engaged with the cam groove 37. The protrusion 33 protrudes from the arm 29 toward the first radial direction and is engaged with the opening 17a of the movable member 17 at the intermediate portion. The opening 17a is concave with the outer side in the second radial direction being open. The front end of the protrusion 33 protrudes from the movable member 17 and is engaged with the cam groove 37 of the target clamp 15. The rest is the same as in the first embodiment.

[0089] In the second embodiment of this structure, the same effects as those in the first embodiment can also be achieved.

[0090] Embodiment 3

[0091] Figure 10 of (A) to Figure 10 of (C) shows the closed state of the clamp assembly according to Embodiment 3 of the present invention. Figure 10 of (A) is a perspective view, Figure 10 of (B) is a front view and Figure 10 of (C) is a side view. Figure 11 of (A) to Figure 11 of (C) shows Figure 10 of (A) to Figure 10 of (C) the open state of the clamp assembly, Figure 11 of (A) is a perspective view, Figure 11 of (B) is a front view and Figure 11 of (C) is a side view. Additionally, Figure 10 of (B) and Figure 11 of (B) are shown in a state where a part of the support portion 13 is omitted to expose the internal structure. Moreover, in Embodiment 3, the same reference numerals are given to the structures corresponding to those in the first embodiment, and repeated descriptions are omitted.

[0092] In this embodiment, the clamp assembly 7 is configured as a link type. That is, the joint portions of the respective clamps 15 to the movable member 17 include links 41.

[0093] The link 41 is rod-shaped in this embodiment. One side in the long side direction of the link 41 is rotatably coupled to the other side in the second radial direction of the clamp 15, and the other side in the long side direction of the link 41 is rotatably coupled to the movable member 17. Additionally, the link 41 does not have to be rod-shaped as long as it is provided across the clamp 15 and the movable member 17 and can be coupled to them.

[0094] The link 41 rotates about the other side in the longitudinal direction of the movable member 17 corresponding to the reciprocating movement of the movable member 17 in the axial direction. By this rotation, the clamp 15 rotates about the rotary shaft portion 31 to open and close.

[0095] Moreover, in the present embodiment, in the cam portion 19, the cam pin 35 is commonly used between the pair of clamps 15. That is, the cam groove 37 is provided so as to penetrate through the arm 29 of the clamp 15 in the first radial direction. The cam grooves 37 of the pair of clamps 15 partially overlap in the first radial direction. A common cam pin 35 is inserted through the cam grooves 37 of the pair of clamps 15. Both ends of the cam pin 35 are engaged with the through holes 39 provided in the support portion 13.

[0096] Furthermore, in the present embodiment, the rotary shaft portions 31 of the respective clamps 15 protrude toward both sides in the first radial direction with respect to the main body portion 27. The support wall portions 23 of the support portion 13 each include recesses 25 on both sides in the second radial direction. And the rotary shaft portions 31 are rotatably engaged with the recesses 25 on both sides in the first radial direction. As a result, the rotary shaft portions 31 are supported by being bridged between the two support wall portions 23 of the support portion 13 in the first radial direction. Other structures are the same as those in the first embodiment.

[0097] In the third embodiment of this structure, the same effects as those in the first embodiment can also be achieved. Moreover, in the present embodiment, since the rotary shaft portions 31 are rotatably engaged with the recesses 25 on both sides in the first radial direction, the support and operation of the rotary shaft portions 31 are likely to be stable.

[0098] Explanation of Reference Numerals

[0099] 1: Pliers

[0100] 7: Clamp assembly

[0101] 13: Support portion

[0102] 15: Clamp

[0103] 17: Movable member

[0104] 17a: Opening

[0105] 19: Cam portion

[0106] 25: Recess

[0107] 31: Rotary shaft portion

[0108] 33: Protrusion

[0109] 35: Cam pin

[0110] 37: Cam groove

[0111] RC: Rotation center

[0112] OC: Opening and Closing Center

Claims

1. A clamp assembly, comprising: A pair of clamps that open and close with respect to each other; A support portion that rotatably supports at least one of the pair of clamps to enable the opening and closing; And A movable member that is rotatably coupled to at least one of the pair of clamps rotatably supported by the support portion and is capable of reciprocating relative to the support portion, The support portion includes a recess that opens at an edge in a direction intersecting the reciprocating movement direction of the movable member, At least one of the pair of clamps rotatably supported by the support portion includes a rotating shaft portion that is rotatably engaged with the recess from the outside in the intersecting direction.

2. The clamp assembly according to claim 1, comprising: A cam portion provided between the support portion and at least one of the pair of clamps rotatably supported by the support portion, and rotating at least one of the pair of clamps rotatably supported by the support portion corresponding to the reciprocating movement of the movable member to perform the opening and closing, The cam portion maintains the engagement state of the rotating shaft portion with respect to the recess.

3. The clamp assembly according to claim 1 or 2, wherein Regarding at least one of the pair of clamps rotatably supported by the support portion, the rotation center and the coupling portion to the movable member are spaced apart in a direction intersecting the reciprocating movement direction of the movable member at least in the closed state of the pair of clamps.

4. The clamp assembly according to claim 3, wherein The rotation center and the coupling portion are located on opposite sides of the intersecting direction across the opening and closing center of the pair of clamps at least in the closed state of the pair of clamps.

5. The clamp assembly according to claim 1 or 2, wherein The movable member includes one of an opening and a protrusion, At least one of the pair of clamps rotatably supported by the support portion includes the other of the opening and the protrusion that engages with one of the opening and the protrusion.

6. The clamp assembly according to claim 5, wherein The opening is a long hole that enables relative movement of the protrusion in the intersecting direction, Before the engagement of the rotating shaft portion with the recess is maintained, the detachment of the rotating shaft portion from the recess is permitted.

7. A surgical instrument that uses the clamp assembly according to claim 1.

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