Clamping device and clamping system
By designing a bending structure in the clamping part of the clamping device and increasing the clamping length, the problem of insufficient clamping stability in the prior art is solved, and a higher clamping stability and miniaturization design are achieved.
Patent Information
- Application Number
- CN202421124435.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Priority Date
- 2023-05-22
- Filing Date
- 2024-05-21
- Publication Date
- 2025-05-20
- Estimated Expiration
- 2034-05-21
AI Technical Summary
When existing clamping devices clamp the leaflets, the elastic structure of the inner clamping arm is difficult to effectively increase the clamping length, resulting in insufficient clamping stability.
A clamper is designed including an elastic hook and a clamping assembly that can be opened or closed relative to the central axis. The angle between the first portion of the hook clamping portion and the axis of symmetry is smaller than the angle between the second portion and the axis of symmetry to form a bending structure to increase the clamping length.
By increasing the clamp length, the clamping stability of the clamping device is improved and a miniaturized design is achieved while maintaining elasticity.
Smart Images
Figure CN222885388U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of interventional medical devices, in particular to a clip applicator and a clamping system. Background Art
[0002] Mitral valve disease is a common disease among the elderly population, including two common types: mitral regurgitation and mitral stenosis, with mitral regurgitation being the most common. According to statistics, the incidence of mitral regurgitation in people over 75 years old is as high as 10%. Mild mitral regurgitation generally has no impact on normal life, while moderate to severe or severe mitral regurgitation requires intervention. The traditional surgical treatment method is open-chest surgery. With the support of a cardiopulmonary bypass machine, the heart is opened to repair or replace the valve, but high-risk patients cannot tolerate it. In recent years, the emerging interventional treatment has brought hope to high-risk patients with mitral regurgitation. Interventional treatment generally delivers instruments to the lesion site through a catheter to repair or replace the valve. Currently, most transcatheter mitral valve replacement products are in the clinical research stage. Among the transcatheter mitral valve repair products that are currently on the market, there are the MitraClip product produced by Abbott and the Pascal product produced by Edwards. Their principle is to use a clamping device to clamp the anterior and posterior leaflets of the mitral valve, reducing the valve orifice area to achieve the purpose of treating regurgitation. MitraClip uses a mechanically locked clamping device, which needs to be unlocked during interventional operations to perform the clamping operation. Therefore, the operation is complex, and the clamping stress cannot be controlled because it is a mechanically locked type. As a result, the instrument causes greater damage to the valve leaflets. Pascal overcomes this defect of MitraClip and uses an elastic clamping method, clamping the valve leaflets between the elastic clamping arms and the flexible spacer to relieve the stress of valve leaflet clamping and reduce valve leaflet damage. On the other hand, because it uses elastic clamping arms, the clamping force is provided by the elasticity of the clamping arms, so there is no need for a mechanical locking mechanism, and its product structure design is relatively simple and the operation is more convenient. However, currently, whether it is a mechanical clamping or an elastic clamping method, the inner clamping arms both use an elastic structure, relying on the elasticity of the elastic inner clamping arms themselves to cooperate with the corresponding clamping parts on the other side to achieve clamping. In the design process of the existing clip applicator, it is particularly important to increase the effective clamping length of the inner clamping arms when clamping the valve leaflets as much as possible while ensuring the elastic requirements of the inner clamping arms to improve the clamping stability. Summary of the Utility Model
[0003] The purpose of the embodiment of the utility model is to improve the clamping stability of the clip applicator.
[0004] To solve the above technical problems, the embodiment of the utility model provides the following technical solutions:
[0005] The present utility model provides a clamp for clamping tissues, which includes an elastic hook and a pair of clamping components that can be opened or closed relative to the central axis of the clamp. The hook includes a hook fixing part and hook clamping parts symmetrically arranged on both sides of the hook fixing part. The hook is arranged inside the pair of clamping components, and one hook clamping part cooperates with one clamping component to clamp tissues. The hook clamping part includes a first part close to the axis of symmetry and a second part connected to the first part; in the natural state, the angles between the first part and the second part and the axis of symmetry are α1 and α2 respectively, and α1 is less than α2.
[0006] In one embodiment, the difference between α1 and α2 is between 1° and 10°.
[0007] In one embodiment, the extension length of the first part is not greater than one-third of the total length of the hook clamping part.
[0008] In one embodiment, it further includes a guiding tube having a preset axial length along the central axis of the clamp and a spacer sleeved on the guiding tube. The spacer is placed between the two hook clamping parts of the hook. The surface of the spacer opposite to the hook clamping part is a first arc surface concave towards the central axis of the clamp, and the radial distance between the two first arc surfaces gradually increases from the distal end to the proximal end.
[0009] In one embodiment, the two first arc surfaces of the spacer are respectively connected by a second arc surface on the same side, and the two formed second arc surfaces are convex relative to the central axis of the clamp.
[0010] In one embodiment, the hook fixing part includes a fixed section and connecting sections connected to both sides of the fixed section. The two connecting sections are symmetrically arranged relative to the axis of symmetry. Each connecting section includes a first bending section convex relative to the axis of symmetry. A receiving cavity is formed between the fixed section and the two convex first bending sections;
[0011] The clamp further includes a connecting seat fixedly arranged on the distal side of the spacer. The two end faces of the connecting seat are first curved surfaces adapted to the inner curved surfaces of the first bending sections; the connecting seat is received in the receiving cavity, and the fixed section of the hook is fixedly connected to the connecting seat.
[0012] In one embodiment, each connecting section includes a second bending section concave relative to the axis of symmetry. One end of the first bending section is connected to the fixed section, the other end is connected to one end of the second bending section, and the other end of the second bending section is connected to the first part of the hook clamping part.
[0013] In one embodiment, a pair of the clamping assemblies includes a pair of clamping arms and a pair of support arms. One end of a support arm is hinged to the connecting seat, and the other end is rotatably connected to one end of the clamping arm. One ends of the pair of clamping arms, which are away from the support arms, are rotatably connected.
[0014] In one embodiment, the connecting seat includes a seat body and a connecting pipe provided on the distal side of the seat body. On both sides of the root of the connecting pipe in the radial direction, partial protrusions are formed; a connecting hole that can pass through the connecting pipe is provided on the fixed section, and both sides of the connecting hole in the radial direction are recessed to be adapted to and clamped with the protrusions.
[0015] In one embodiment, it further includes a sleeve. The outer diameter of the sleeve is larger than the minimum aperture of the connecting hole. The sleeve is sleeved on the connecting pipe on the distal side of the fixed section and is relatively fixed to the connecting pipe. The hook fixing part is limited between the seat body and the sleeve.
[0016] Another solution of the present utility model is to provide a clamp, which includes an elastic hook and a pair of clamping assemblies that can be opened or closed relative to the central axis of the clamp. The hook includes a hook fixing part and hook clamping parts symmetrically arranged on both sides of the hook fixing part. The hook is arranged inside the pair of clamping assemblies, and one hook clamping part cooperates with one clamping assembly to clamp tissues. The clamp further includes a spacer placed between the two hook clamping parts of the hook. The surface of the spacer opposite to the hook clamping part is a first arc surface that is concave towards the central axis of the clamp, and the radial distance between the two first arc surfaces gradually increases from the distal end to the proximal end.
[0017] In one embodiment, the same sides of the two first arc surfaces of the spacer are respectively connected by a second arc surface, and the two formed second arc surfaces are convex relative to the central axis of the clamp.
[0018] In one embodiment, the hook fixing part includes a fixed section and connecting sections connected to both sides of the fixed section. The two connecting sections are symmetrically arranged relative to the symmetry axis. Each connecting section includes a first bending section that protrudes relative to the symmetry axis. A receiving cavity is formed between the fixed section and the two protruding first bending sections;
[0019] The clamp further includes a connecting seat fixedly provided on the distal side of the spacer. The two end faces of the connecting seat are first curved surfaces adapted to the curved inner surfaces of the first bending sections; the connecting seat is received in the receiving cavity, and the fixed section of the hook is relatively fixed to the connecting seat.
[0020] In one embodiment, each of the connecting segments includes a second bending segment that is concave relative to the axis of symmetry. One end of the first bending segment is connected to the fixed segment, the other end is connected to one end of the second bending segment, and the other end of the second bending segment is connected to the first part of the hook clamping portion.
[0021] In one embodiment, a pair of the clamping assemblies includes a pair of clamping arms and a pair of support arms. One end of a support arm is hinged to the connecting seat, the other end is rotatably connected to one end of the clamping arm, and the ends of the pair of clamping arms remote from the support arms are rotatably connected.
[0022] In one embodiment, the connecting seat includes a seat body and a connecting pipe provided on the distal side of the seat body. On both sides of the root of the connecting pipe in the radial direction, partial protrusions are formed; a connecting hole that can pass through the connecting pipe is provided on the fixed segment, and both sides of the connecting hole in the radial direction are recessed to be adapted and clamped with the protrusions.
[0023] In one embodiment, a sleeve is further included. The outer diameter of the sleeve is larger than the minimum aperture of the connecting hole. The sleeve is sleeved on the connecting pipe on the distal side of the fixed segment and is relatively fixed to the connecting pipe. The hook fixing portion is limited between the seat body and the sleeve.
[0024] The present utility model further provides a clamping system, including the clamp as described in any one of the above and a conveying assembly, and the conveying assembly is detachably connected to the clamp.
[0025] In the clamp and the clamping system of the present utility model, the angle α1 between the first part of the hook clamping portion and the axis of symmetry is smaller than the angle α2 between the second part and the axis of symmetry, that is, a certain bend is formed at the connection between the first part and the second part, so that in the natural state, the second part is bent upward relative to the first part. This setting enables the second part mainly used for clamping tissue to have a longer effective clamping length. At the same time, the first part near the root close to the axis of symmetry presses downward, which can effectively maintain the elasticity of the hook. Under the same clip length, this setting ensures the elasticity of the hook while making the effective clamping length of the hook clamping portion longer, improving the clamping stability of the clamp. In addition, under this setting, the axial height of the entire hook in the closed state can be lower, which is beneficial for miniaturization. That is, while achieving miniaturization, both the elasticity and the effective clamping length are ensured. Description of the Drawings
[0026] To more clearly illustrate the solutions in the present utility model, the accompanying drawings required for the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are some embodiments of the present utility model or the corresponding prior art. For those of ordinary skill in the art, other accompanying drawings can be obtained based on these drawings without creative efforts. Among them:
[0027] Figure 1 is a schematic structural diagram of the clamp of the present utility model;
[0028] Figure 2 is a schematic structural diagram of the hook in the clamp of the present utility model;
[0029] Figure 3 is a three-dimensional structural diagram of the hook in the clamp of the present utility model;
[0030] Figure 4 is a partial structural diagram of the hook in the clamp of the present utility model in the natural state;
[0031] Figure 5 is a schematic structural diagram of the hook in the clamp of the present utility model when closed;
[0032] Figure 6 is a schematic structural diagram of the spacer in the clamp of the present utility model;
[0033] Figure 7 is a top-view structural diagram of the spacer in the clamp of the present utility model;
[0034] Figure 8 is a three-dimensional structural diagram of the spacer in the clamp of the present utility model;
[0035] Figure 9 is a top-view structural diagram of the clamp of the present utility model when closed after clamping tissue;
[0036] Figure 10 is a side-view structural diagram of the clamp of the present utility model when closed;
[0037] Figure 11 is a partial structural diagram of the hook in the clamp of the present utility model;
[0038] Figure 12 is a schematic structural diagram of the connecting seat in the clamp of the present utility model;
[0039] Figure 13 is a partial structural diagram of the clamp of the present utility model after the connecting seat and the hook are assembled;
[0040] Figure 14 is a partial three-dimensional diagram of the hook in the clamp of the present utility model;
[0041] Figure 15 This is a schematic structural view of the sleeve of the utility model's clip-on device sleeved on the connecting pipe of the connecting seat. Specific embodiments
[0042] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.
[0043] In the description of the present utility model, it should be noted that: the orientation or positional relationship indicated by terms such as "upper", "lower", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation of the present utility model. In addition, terms such as "first", "second", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance; when an element is referred to as "fixed to" or "disposed on" another element, the element can be directly connected to the other element, or indirectly connected to the other element through one or more connecting elements. When an element is referred to as "connected to" another element, it can be directly connected to the other element, or connected to the other element through one or more connecting elements.
[0044] It should also be noted that in the field of interventional medical devices, the proximal end refers to the end closer to the operator, and the distal end refers to the end farther from the operator; the direction of the rotation central axis of an object such as a cylinder or a tube is defined as the axial direction; the circumferential direction is the direction around the axis of an object such as a cylinder or a tube (perpendicular to the axis and perpendicular to the cross-sectional radius at the same time); the radial direction refers to the direction along the wire diameter or radius. It should be noted that regardless of the "end" in words such as "proximal end", "distal end", "one end", "the other end", "the first end", "the second end", "the initial end", "the terminal end", "both ends", "the free end", "the upper end", "the lower end", etc., it not only refers to the end head, endpoint or end face, but also includes the part that extends a certain axial distance and / or radial distance on the element to which the end head, endpoint or end face belongs from the end head, endpoint or end face. The above definitions are only for the convenience of expression and cannot be construed as a limitation of the present utility model.
[0045] The clip-on device and clip-on system provided by the present utility model are used for repairing heart valves, especially mitral valves and tricuspid valves, so as to achieve the purpose of reducing the gap between valve leaflets and reducing mitral or tricuspid regurgitation.
[0046] Please refer toFigure 1 , Figure 2 and Figure 3 , the present utility model provides a clamp 100 for clamping tissue Y. The clamp 100 has a central axis o-o. The clamp 100 includes an elastic hook 104 and a pair of clamping assemblies 20 that can be opened or closed relative to the central axis o-o of the clamp 100. The hook 104 includes a hook fixing portion 1041 and hook clamping portions 1043 symmetrically arranged on both sides of the hook fixing portion 1041. As Figure 2 shown, the hook 104 has a symmetry axis x-x. The hook clamping portions 1043 on both sides are symmetrically arranged on both sides of the hook fixing portion 1041. The two hook clamping portions 1043 extend in directions away from the symmetry axis x-x respectively. The hook 104 is arranged inside a pair of clamping assemblies 20. And a hook clamping portion 1043 cooperates with a clamping assembly 20 to clamp the tissue Y. The hook clamping portion 1043 includes a first part 1043-1 arranged close to the symmetry axis x-x and a second part 1043-2 connected to the first part 1043-1. It can be understood that both the first part 1043-1 and the second part 1043-2 extend in directions away from the symmetry axis x-x. Both the first part 1043-1 and the second part 1043-2 have a certain extension length. In the natural state (i.e., the state without external force), the angles between the first part 1043-1 and the symmetry axis x-x and between the second part 1043-2 and the symmetry axis x-x are α1 and α2 respectively, and α1 is less than α2. It should be noted that the angles between the first part 1043-1 and the second part 1043-2 and the symmetry axis x-x are the angles between the bottom surface of the hook clamping portion 1043 and the symmetry axis x-x in the natural state. The angle α1 between the first part 1043-1 of the hook clamping portion 1043 of the present utility model and the symmetry axis x-x is less than the angle α2 between the second part 1043-2 and the symmetry axis x-x, that is, a certain bend is formed at the connection between the first part 1043-1 and the second part 1043-2, so that the second part 1043-2 is bent upward relative to the first part 1043-1. This setting enables the second part 1043-2 mainly used for clamping tissue to have a longer effective clamping length. At the same time, the first part 1043-1 at the root close to the symmetry axis presses downward, which can effectively maintain the elasticity of the hook. Under the same clip length, this setting ensures the elasticity of the hook while making the effective clamping length of the hook clamping portion longer, improving the clamping stability of the clamp. As Figure 4As shown, when the first part 1043-1 and the second part 1043-2 of the hook clamping part 1043 are not bent (as shown by the dashed line in the figure), that is, the non-bent second part 1043-2' extends along the end of the first part 1043-1. At this time, the angles between them and the symmetry axis x-x are equal. In this structure, the effective clamping length of the non-bent second part 1043-2' is L2. And when the hook clamping part 1043 has the same length, when the first part 1043-1 and the second part 1043-2 of the hook clamping part 1043 are bent, that is, the second part 1043-2 is bent upward and extends at the end of the first part 1043-1. At this time, the angle α1 between the first part 1043-1 and the symmetry axis x-x is less than the angle α2 between the second part 1043-2 and the symmetry axis x-x. In this state, the effective clamping length of the second part 1043-2 is L1. Obviously, L1 is greater than L2, that is, the effective clamping length of the hook clamping part after bending treatment is longer. And in this structure, the first part 1043-1 tends to press downward, effectively ensuring the pressing elasticity of the hook. In addition, this setting can make the axial height of the whole hook lower in the closed state, which is conducive to miniaturization. That is, while realizing miniaturization, both elasticity and effective clamping length are ensured; as Figure 5 As shown, this figure is the state of the hook when the clamp is closed, and the superelasticity of the hook is ensured in this state. It can be seen from this figure that when the first part 1043-1 and the second part 1043-2 of the hook clamping part 1043 are not bent (as shown by the dashed line in the figure), that is, the non-bent second part 1043-2' extends along the end of the first part 1043-1. In this structure, the height of the non-bent second part 1043-2' is H2; and when the hook clamping part 1043 has the same length, when the first part 1043-1 and the second part 1043-2 of the hook clamping part 1043 are bent, that is, the second part 1043-2 is bent and extends at the end of the first part 1043-1. In this state, the height of the second part 1043-2 is H1. Obviously, H1 is less than H2, and the axial height is lower after bending treatment, which is conducive to miniaturization. It should also be noted that after assembly, the symmetry axis x-x is coaxial with the central axis o-o of the clamp 100. Among them, in the natural state, the angle of the angle α2 is less than 90°, that is, the angle between the lower surfaces of the two hook clamping parts 1043 is less than 180°, that is, the opening angle of the two hook clamping parts 1043 is greater than 180°. The hook fixing part 1041 can be generally U-shaped.
[0047] Preferably, the difference between the included angle α1 and the included angle α2 is between 1° and 10°. In this embodiment, the difference between 1° and 10° includes both endpoints, that is, the difference can be 1° or 10°. The selection of this range ensures the elastic demand of the buckle and increases the effective clamping length as much as possible, while avoiding breakage caused by too large a bending angle. Further, the extension length of the first part 1043-1 is not greater than one-third of the total length of the buckle clamping part 1043. Preferably, the extension length of the first part 1043-1 is between one-fifth and one-fourth of the total length of the buckle clamping part 1043. This range meets the elastic pressing demand and avoids the excessive elasticity caused by the too long first part 1043-1, resulting in an increase in the required pulling force.
[0048] Please refer to Figure 1 and Figures 6 - 8 , in other embodiments, the clamp 100 of the present utility model further includes a guide tube 109 having a preset axial length along the central axis o-o of the clamp 100 and a spacer 101 sleeved on the guide tube 109. The spacer 101 is disposed between the two buckle clamping parts 1043 of the buckle 104. The surface of the spacer 101 opposite to the buckle clamping part 1043 is a first arc surface 1011 concave towards the central axis o-o of the spacer 101. The radial distance between the two first arc surfaces 1011 gradually increases from the distal end to the proximal end, that is Figure 6 as shown in
[0049] Please see Figures 8 - 10 , the shape of the spacer 101 with two relatively concave surfaces is a profiling shape, and its shape fits the internal space constructed by the clamping assembly 20 and fills the inside of the clamping assembly 20 fully. Generally, the buckle 104 is a sheet-like structure. The sheet-like buckle clamping part 1043 forms a surface contact with the concave first arc surface 1011 and further forms extrusion, so that the spacer 101 can deform and fill based on the space constructed by the clamping assembly 20 to form an effective seal.
[0050] Please continue to see Figures 6 - 8 , the same sides of the two opposite first arc surfaces 1011 of the spacer 101 are respectively connected by a second arc surface 1012, and the two formed second arc surfaces 1012 are convexly arranged relative to the central axis o-o of the spacer 101. In other embodiments, the edge of the first arc surface 1011 and the edge of the second arc surface 1012 can be further connected by a third arc surface 1013. Among them, the two convex second arc surfaces 1012 gradually reduce in diameter from the middle position to the two extended end sides and approach the guide tube 109. The two convex second arc surfaces 1012 can radially extend outwards as the two first arc surfaces 1011 are squeezed, so as to fill the two sides of the clamping assembly 20 and improve the sealing effect.
[0051] Please combine with Figure 2 and Figure 11 As shown, the hook fixing part 1041 includes a fixing section 1041-1 and connecting sections 1041-2 connected to both sides of the fixing section 1041-1. The two connecting sections 1041-2 are symmetrically arranged with respect to the symmetry axis x-x. Each connecting section 1041-2 includes a first bending section 1041-2a protruding outward with respect to the symmetry axis x-x. An inner surface of the first bending section 1041-2a forms a bent inner surface a. A receiving cavity 104a is formed between the fixing section 1041-1 and the two outwardly protruding first bending sections 1041-2a.
[0052] Refer to Figure 1 、 Figure 6 and Figure 8 As shown, the clamp 100 of the present utility model further includes a connecting seat 110 fixedly provided on the distal side of the spacer 101. Specifically, in combination with Figure 8 and Figure 12 As shown, both end faces of the connecting seat 110 are first curved surfaces b adapted to the inner surface of the first bending section 1041-2a, that is, the first curved surface b cooperates with the bent inner surface a. In combination with Figure 1 as well as Figures 11 - 13 As shown, the connecting seat 110 is received in the receiving cavity 104a, and the fixing section 1041-1 of the hook 104 is relatively fixed to the connecting seat 110. As Figure 13 As shown, when the connecting seat 110 and the hook 104 are assembled, the seat body 111 of the connecting seat 110 is placed in the receiving cavity 104a. Both end faces of the seat body 111 of the connecting seat 110 are first curved surfaces b protruding outward with respect to the symmetry axis x-x. The outwardly protruding first curved surface b cooperates with the bent inner surface a of the outwardly protruding first bending section 1041-2a. The cooperation in the present utility model means that after installation, the first curved surface b fits with the bent inner surface a or there is a small gap between them (for example, the radius of curvature of the bent inner surface of the first bending section 1041-2a is greater than the radius of curvature of the first curved surface b of the connecting seat 110), forming a clearance fit. This clearance is sufficient as long as it does not affect their respective functions. Of course, for the stability of the connection, they fit together after installation. At this time, the connecting seat 110 is clamped in the fixing section 1041-1 of the hook fixing part 1041. Inevitably, there are engaging surfaces that cooperate with each other.
[0053] Please continue to refer to Figure 11, in other embodiments, in the natural state, each connecting section 1041-2 further includes a second bending section 1041-2b that is concave with respect to the relative symmetry axis x-x. One end of the first bending section 1041-2a is connected to the fixed section 1041-1, and the other end is connected to one end of the second bending section 1041-2b. The other end of the second bending section 1041-2b is connected to the first part 1043-1 of the hook clamping portion 1043. That is, on both sides of the fixed section 1041-1, the first bending section 1041-2a and the second bending section 1041-2b on one side form an S-shaped structure after being connected, and the other side forms an inverted S-shaped structure symmetrical to the S-shaped structure after being connected. On the one hand, this S-shaped structure ensures the space required for connecting to the connecting seat 110, and on the other hand, it ensures the elasticity of the hook clamping part. The radius of curvature of the first bending section 1041-2a ranges from 0.8 to 1 mm, and the bending angle ranges from 100° to 140°; the radius of curvature of the second bending section 1041-2a is 0.8 to 1 mm, and the bending angle ranges from 100° to 140°.
[0054] Continue to refer to Figure 1 As shown, a pair of clamping components 20 of the clamp 100 of the present utility model includes a pair of clamping arms 102 and a pair of support arms 103. That is, one clamping component 20 includes a clamping arm 102 and a support arm 103. One end of a support arm 103 is hinged to the seat body 111 of the connecting seat 110 through a hinge shaft, and the other end is rotatably connected to one end of the clamping arm 102. The ends of a pair of clamping arms 102 away from the support arm 103 are rotatably connected. Among them, the clamping arm 102 is a clamping piece or a clamping frame. Preferably, the clamping arm 102 is a clamping frame structure formed by bending a single piece. The clamping arm 102 has elasticity, and in the natural state, the two opposite clamping arms 102 are elastically close to each other. The support arm 103 can be a sheet-like or rod-like structure, and the support arm 103 has a certain support strength.
[0055] Refer to together Figures 12 - 14 As shown, the connecting seat 110 includes a seat body 111 and a connecting pipe 112 provided on the distal side of the seat body 111. On both sides of the root of the connecting pipe 112 in the radial direction, local protrusions are formed to form protrusion parts 113; a connecting hole 104b that can pass through the connecting pipe 112 is provided on the fixed section 1041-1. On both sides of the connecting hole 104b in the radial direction, depressions are formed to form depression parts 104c. After assembly, the protrusion parts 113 on the connecting seat 110 can be accommodated in the depression parts 104c and are adaptively clamped with them. One end of the connecting pipe 112 away from the seat body 111 extends outside the fixed section 1041-1 of the hook 104. The cooperation between the protrusion parts 113 and the depression parts 104 enables the connecting seat 110 and the hook 104 to form a circumferential limit and avoid rotation.
[0056] Please refer to Figure 15, the clamp 100 of the present utility model further includes a sleeve 120. The outer diameter of the sleeve 120 is larger than the minimum aperture of the connection hole 104b. The sleeve 120 is sleeved on the connection pipe 112 on the distal side of the fixed section 1041-1 and is relatively fixed to the connection pipe 112, so that the hook fixing part 1041 is limited between the seat body 111 and the sleeve 120.
[0057] Among them, in the present utility model, a shaft hole is provided on the connection seat 110. The guide pipe 109 can pass through the shaft hole and be relatively fixed to the connection seat 110. By controlling the axial direction of the guide pipe 109, the clamping assembly 20 can be driven to open or close. As a fixing method, after the guide pipe 109 passes through the shaft hole of the connection seat 110, both ends extend, and then the connection pipe 112 is welded and fixed to the guide pipe 109 in the circumferential direction. Further, the sleeve 120 is sleeved on the connection pipe 112, and the connection pipe 112 is welded and fixed to the sleeve 120 in the circumferential direction. In this embodiment, through the engagement of the protruding part 113 on the connection seat 110 and the recessed part 104 on the hook 104, relative fixation in the circumferential direction is formed; and then through the fixation of the sleeve 120 and the connection pipe 112, axial limit fixation is formed. In this way, the non-destructive fixation of the hook 104 is realized, that is, there is no need to perform local welding and other fixation treatments on the hook 104, avoiding the reduction of the local strength of the hook and causing fracture damage, and effectively ensuring the elasticity and service life of the hook.
[0058] Among them, in order to improve the plugging effect of the clamp, please refer to Figure 1 and Figures 6 - 8 , the present utility model further provides a clamp 100. The clamp 100 includes an elastic hook 104 and a pair of clamping assemblies 20 that can open or close relative to the central axis of the clamp. The hook 104 includes a hook fixing part 1041 and hook clamping parts 1042 symmetrically arranged on both sides of the hook fixing part 1041. The hook 104 is arranged inside a pair of clamping assemblies 20, and one hook clamping part 1042 cooperates with one clamping assembly 20 to clamp tissue. The clamp 100 further includes a spacer 101 placed between the two hook clamping parts 1042 of the hook 102. The surface of the spacer 101 opposite to the hook clamping part 1042 is a first arc surface 1011 that is concave towards the central axis o-o of the clamp. The radial distance between the two first arc surfaces 1011 gradually increases from the distal end to the proximal end. For the specific structure and effect of the spacer 101, reference can be made to the above, and details will not be repeated here. The structure of the hook 104 in this embodiment may be the same as or different from the aforementioned hook structure.
[0059] Further, the two first arc surfaces 1011 of the spacer 101 in this embodiment are respectively connected by a second arc surface 1012 on the same side, and the formed two second arc surfaces 1012 protrude outward relative to the central axis o-o of the clamp. For the specific structure and effect of the second arc surface 1012, reference can be made to the above, and details will not be repeated here.
[0060] Among them, the hook fixing part 1041 includes a fixing section 1041-1 and connecting sections 1041-2 connected to both sides of the fixing section 1041-1. The two connecting sections 1041-2 are symmetrically arranged relative to the axis of symmetry. Each connecting section 1041-2 includes a first bending section 1041-2a protruding outward relative to the axis of symmetry. An accommodation cavity 104a is formed between the fixing section 1041-1 and the two protruding first bending sections 1041-2a; the clamp further includes a connecting seat 110 fixedly arranged on the distal side of the spacer 101. The two end faces of the connecting seat 110 are first curved surfaces b adapted to the inner curved surfaces of the first bending sections 1041-2a; the connecting seat 110 is accommodated in the accommodation cavity 104a, and the fixing section 1041-1 of the hook is fixedly opposed to the connecting seat 110.
[0061] Each connecting section 1041-2 includes a second bending section 1041-2b concave inward relative to the axis of symmetry. One end of the first bending section 1041-2a is connected to the fixing section 1041-1, the other end is connected to one end of the second bending section 1041-2b, and the other end of the second bending section 1041-2b is connected to the first part of the hook clamping part.
[0062] Exemplarily, a pair of clamping assemblies 20 includes a pair of clamping arms 102 and a pair of support arms 103. One end of a support arm 103 is hinged to the connecting seat 110, and the other end is rotatably connected to one end of the clamping arm 102. The ends of the pair of clamping arms 102 away from the support arms 103 are rotatably connected.
[0063] Among them, the connecting seat 110 includes a seat body 111 and a connecting pipe 112 arranged on the distal side of the seat body 111. On both sides of the root of the connecting pipe 112, local protrusions are formed in the radial direction to form protrusion parts 113; a connecting hole 104b that can pass through the connecting pipe 112 is provided on the fixing section 1041-1. On both sides of the connecting hole 104b in the radial direction, depressions are formed to be adapted and clamped with the protrusion parts 113.
[0064] The clamp of this embodiment further includes a sleeve. The outer diameter of the sleeve is greater than the minimum aperture of the connecting hole 104b. The sleeve is sleeved on the connecting pipe 112 on the distal side of the fixing section 1041-1 and is fixedly opposed to the connecting pipe 112. The hook fixing part 1041 is limited between the seat body 111 and the sleeve. It should be noted that the structures and connection relationships of the components of the clamp of this embodiment can be referred to the foregoing, and will not be elaborated here.
[0065] The present utility model further provides a clamping system. The clamping system includes the above-mentioned clamp 100 and a conveying component. The conveying component is detachably connected to the clamp 100.
[0066] It should be noted that this application claims the priority of the application with the application number 202310588490.0 filed on May 22, 2023. The entire content thereof is incorporated herein by reference. For other structures in this utility model, reference may be made to the detailed description in the priority document of this case, and no detailed description will be given here.
[0067] In the clip and the clip system of the present utility model, the included angle α1 between the first part of the hook clamping part and the symmetry axis is smaller than the included angle α2 between the second part and the symmetry axis. That is, a certain bend is formed at the connection of the first part and the second part, so that in the natural state, the second part bends upward relative to the first part. This setting enables the second part mainly used for clamping tissue to have a longer effective clamping length. At the same time, the first part near the root of the symmetry axis presses downward, which can effectively maintain the elasticity of the hook. With the same clip length, this setting ensures the elasticity of the hook while making the effective clamping length of the hook clamping part longer, improving the clamping stability of the clip. In addition, under this setting, the axial height of the entire hook in the closed state can be lower, which is conducive to miniaturization. That is, while achieving miniaturization, both the elasticity and the effective clamping length are ensured.
[0068] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, various modifications and changes can be made to the present utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the scope of the claims of the present utility model.
Claims
1. A clamp for clamping tissue, characterized in that: It includes an elastic hook and a pair of clamping components that can be opened or closed relative to the central axis of the clamp, the hook includes a hook fixing part and a hook clamping part symmetrically arranged on both sides of the hook fixing part, the hook is arranged on the inner side of a pair of the clamping components, and one of the hook clamping parts cooperates with one of the clamping components to clamp tissue, the hook clamping part includes a first part arranged close to the symmetry axis and a second part connected to the first part; in a natural state, the angles between the first part and the second part and the symmetry axis are α1 and α2 respectively, and α1 is smaller than α2.
2. The clamp according to claim 1, characterized in that: The difference between the α1 and the α2 is between 1° and 10°.
3. The clamp according to claim 1, characterized in that: The extension length of the first portion is no greater than one third of the total length of the hook clamping portion.
4. The clamp according to claim 1, characterized in that: It also includes a guide tube with a preset axial length along the direction of the central axis of the clamp and a spacer sleeved on the guide tube, the spacer is placed between the two hook clamping parts of the hook, the surface of the spacer opposite to the hook clamping part is a first arc surface concave toward the central axis of the clamp, and the radial spacing between the two first arc surfaces gradually increases from the distal end to the proximal end.
5. The clamp according to claim 4, characterized in that: The same sides of the two first arc surfaces of the spacer are respectively connected by a second arc surface, and the two second arc surfaces are convexly arranged relative to the central axis of the clamp.
6. The clamp according to claim 4, characterized in that: The buckle hook fixing portion includes a fixing section and connecting sections connected to both sides of the fixing section, the two connecting sections are symmetrically arranged relative to the symmetry axis, each of the connecting sections includes a first curved section convex relative to the symmetry axis, and a containing cavity is formed between the fixing section and the two convex first curved sections; The clamp also includes a connecting seat fixedly arranged on the distal end side of the spacer, and the two side end surfaces of the connecting seat are first curved surfaces adapted to the curved inner surface of the first curved section; the connecting seat is accommodated in the accommodating cavity, and the fixed section of the buckle is relatively fixed to the connecting seat.
7. The clamp according to claim 6, characterized in that: Each of the connecting sections includes a second curved section that is concave relative to the symmetry axis, one end of the first curved section is connected to the fixed section, and the other end is connected to one end of the second curved section, and the other end of the second curved section is connected to the first part of the hook clamping portion.
8. The clamp according to claim 6, characterized in that: A pair of the clamping assemblies include a pair of clamping arms and a pair of supporting arms, one end of the supporting arm is hinged to the connecting seat, and the other end is rotatably connected to one end of the clamping arm, and one end of the pair of clamping arms away from the supporting arm is rotatably connected.
9. The clamp according to claim 6, characterized in that: The connecting seat includes a seat body and a connecting tube arranged on the distal side of the seat body, and the two radial sides of the root of the connecting tube partially extend out to form an extension portion; a connecting hole that can pass through the connecting tube is provided on the fixed section, and the two radial sides of the connecting hole are recessed to adapt and snap-fit with the extension portion.
10. The clamp according to claim 9, characterized in that It also includes a sleeve, the outer diameter of which is larger than the minimum aperture of the connecting hole, the sleeve is sleeved on the connecting tube at the distal end of the fixing section and fixed relative to the connecting tube, and the hook fixing portion is limited between the seat body and the sleeve.
11. A clamp, characterized in that: It includes an elastic hook and a pair of clamping components that can be opened or closed relative to the central axis of the clamp, the hook includes a hook fixing part and hook clamping parts symmetrically arranged on both sides of the hook fixing part, the hook is arranged on the inner side of a pair of the clamping components, and one of the hook clamping parts cooperates with one of the clamping components to clamp tissue, the clamp also includes a spacer placed between the two hook clamping parts of the hook, the surface of the spacer opposite to the hook clamping part is a first arc surface concave toward the central axis of the clamp, and the radial spacing between the two first arc surfaces gradually increases from the distal end to the proximal end.
12. The clamp according to claim 11, characterized in that The same sides of the two first arc surfaces of the spacer are respectively connected by a second arc surface, and the two second arc surfaces are convexly arranged relative to the central axis of the clamp.
13. A clamping system, characterized in that: It comprises the clamp and conveying assembly as described in any one of claims 1 to 12, wherein the conveying assembly is detachably connected to the clamp.