Traction clip and its clipping structure

Abstract

A traction-type clamping device and its clamping structure are disclosed. In the clamping structure, a fixed arm and a connecting sleeve are fixedly connected, which can improve the stability of the fixed arm. A movable arm is fixed to a conversion component. The fixed arm or connecting sleeve is provided with a fixed shaft, and the conversion component forms a sliding fit with the fixed shaft through a sliding engagement portion thereon. The conversion component is also connected to a moving component. By adjusting the extension direction of the sliding engagement portion, the conversion component swings around the fixed shaft and slides relative to it during the forward and backward movement of the moving component, thereby opening and closing the movable arm relative to the fixed arm.

Description

Technical Field

[0001] This application relates to the field of medical devices, specifically to a clamping structure of a traction clamping device. Background Technology

[0002] With the iterative advancements in endoscopic technology, minimally invasive treatment methods have gradually replaced some traditional open surgeries. Early gastrointestinal lesions that previously required open surgery or laparoscopy can now be precisely intervened through minimally invasive endoscopic techniques. Their core advantages lie in controllable tissue damage, shorter postoperative recovery periods, and improved efficiency in the utilization of medical resources.

[0003] A single-arm clamp is a clinically applied closure instrument for wounds within body cavities. It achieves wound closure through the cooperation of a fixed arm and a movable arm to complete suturing or other procedures and promote wound healing. However, the drive structure of the movable arm in existing single-arm clamps can be further optimized. Utility Model Content

[0004] This application provides a pull-type clamping device and its clamping structure to demonstrate a new driving structure for clamping components.

[0005] To achieve the above objectives, one embodiment of this application provides a clamping structure for a pull-type clamping device, comprising:

[0006] A clamping assembly, comprising a connecting sleeve, a fixed arm, and a movable arm capable of moving relative to the fixed arm, wherein the fixed arm is fixedly connected to the connecting sleeve, and a fixed shaft is provided on the fixed arm or the connecting sleeve.

[0007] A moving part, the moving part being used to move back and forth within the connecting sleeve under the control of an operator;

[0008] And a conversion component, the conversion component being at least partially located within the connecting sleeve, the movable arm being fixedly connected to the conversion component, and the rear end of the conversion component being movably connected to the moving component;

[0009] The conversion component has a sliding engagement portion, which is inclined from front to back and from the movable arm side to the fixed arm side. The sliding engagement portion forms a sliding engagement with the fixed shaft. During the movement of the movable component in the front-back direction, the conversion component swings around the fixed shaft and slides relative to it, so that the movable arm opens and closes relative to the fixed arm.

[0010] In the clamping structure described above, the fixed arm and the connecting sleeve are fixedly connected, which improves the stability of the fixed arm. The movable arm is fixed to the conversion component, which has a fixed shaft on it. The conversion component forms a sliding fit with the fixed shaft through a sliding engagement portion. The conversion component is also connected to the moving component. By setting the extension direction of the sliding engagement portion, the conversion component swings around the fixed shaft and slides relative to it during the forward and backward movement of the moving component, thereby opening and closing the movable arm relative to the fixed arm.

[0011] In one embodiment, the front end of the sliding engagement portion has a first curved path. When the clamping assembly is in the closed state, the fixed shaft is located within the first curved path, and the movable arm and the fixed arm are closed to form a clamping structure. The movement direction of the fixed shaft defined by the first curved path forms an angle with the opening direction of the movable arm to form a self-locking mechanism for the movable arm.

[0012] In one embodiment, when the clamping assembly is in a closed state, the first bending path extends in the front-to-back direction.

[0013] In one embodiment, when the clamping assembly is in the closed state, the direction of motion of the fixed axis defined by the first bending path is perpendicular to the opening direction of the movable arm.

[0014] In one embodiment, when the clamping assembly is in the closed state, the angle c formed by the fixed shaft movement direction defined by the first bending path and the opening direction of the movable arm has a range of 45°≤c≤135°.

[0015] In one embodiment, the rear end of the sliding mating part has a second curved path. When the clamping assembly is in the open state, the fixed shaft is located within the second curved path, and the movable arm and the fixed arm form an open structure. The movement direction of the fixed shaft defined by the second curved path forms an angle with the closing direction of the movable arm, so as to prevent the movable arm from easily moving in the closing direction under the compression of the surrounding tissue.

[0016] In one embodiment, the rear end of the conversion member has an elongated hole, and a sliding shaft is fixedly provided on the moving member. The elongated hole is slidably engaged with the sliding shaft. The elongated hole extends from front to back and is inclined from the side of the movable arm to the side of the fixed arm, so as to adaptively adjust its position relative to the moving member when the conversion member swings.

[0017] In one embodiment, the front end of the fixed arm has a first hook that bends toward the side where the movable arm is located, and the front end of the movable arm has a second hook that bends toward the side where the fixed arm is located; the clamping assembly has a pre-clamping state, a clamping state, and an open state. When the clamping assembly is in the pre-clamping state, the first hook and the second hook extend relative to each other, and the first hook is located in front of the second hook or the second hook is located in front of the first hook, forming an overlapping pre-clamping structure so that the fixed arm can pierce and fix one side of the wound tissue; when the clamping assembly is in the clamping state, the first hook and the second hook can pull and close the tissue on both sides of the wound; when the clamping assembly is in the open state, the movable arm is open relative to the fixed arm.

[0018] In one embodiment, the bending angle α of the first hook portion is in the range of 55°≤α≤140°;

[0019] And / or, the bending angle b of the second hook is in the range of 55°≤b≤140°.

[0020] Based on the above objectives, one embodiment of this application provides a pull-type clamping device, which includes the clamping structure as described in any of the above claims. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the clamping component in one embodiment of the present application, where the clamping component is in a pre-clamping state.

[0022] Figure 2 and 3 They are respectively Figure 1 The diagram shows the internal structure of the clamping assembly in the pre-clamped state and the open state.

[0023] Figure 4 This is a schematic diagram of the structure in one embodiment of this application when the fixed shaft is located within the first bending path;

[0024] Figure 5 This is a schematic diagram showing the second hook located in front of the first hook in one embodiment of this application;

[0025] Figure 6-9 This is a schematic diagram of the clamping component performing a closing operation on a large wound in one embodiment of this application;

[0026] Figure 10 This is a schematic diagram showing the first hook located in front of the second hook in one embodiment of this application;

[0027] Figure 11 This is a schematic diagram showing several different bending angles of the first hook and the second hook in one embodiment of this application;

[0028] Figure 12-14 This is a schematic diagram of the pointed protrusions on the first and second hooks in several different embodiments of this application. In order to better show the shape of the pointed protrusions, the fixed arm and the movable arm are unfolded circumferentially, and the first and second hooks are not yet bent. Detailed Implementation

[0029] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. Similar elements in different embodiments are referred to by related similar element reference numerals. In the following embodiments, many details are described to facilitate a better understanding of the present application. However, those skilled in the art will readily recognize that some features may be omitted in different situations, or may be replaced by other elements, materials, or methods. In some cases, certain operations related to the present application are not shown or described in the specification. This is to avoid obscuring the core parts of the present application with excessive description. For those skilled in the art, detailed description of these related operations is not necessary; they can fully understand the related operations based on the description in the specification and general technical knowledge in the art.

[0030] Furthermore, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various embodiments. At the same time, the steps or actions in the method description can be rearranged or adjusted in a manner obvious to those skilled in the art. Therefore, the various orders in the specification and drawings are only for the clear description of a particular embodiment and do not imply a necessary order, unless otherwise stated that a particular order must be followed.

[0031] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages).

[0032] Please refer to Figure 1-3 This application provides a clamping structure for a pull-type clamping device in some embodiments. The clamping structure includes a clamping assembly 100, a conversion member 214, and a moving member 215. Of course, the moving member 215 and the conversion member 214 are not limited to the structures shown in the figures, and other structures with the same function in the prior art can also be used. In other embodiments, depending on functional requirements, the pull-type clamping device may also include other related components, which can be referred to in the prior art. See [link to relevant documentation]. Figure 2 For ease of description, this application defines the end of the clamping device closest to the operator as rear (B) and the other end as front (F). The terms front and rear in the following text are based on this definition.

[0033] The clamping assembly 100 is used to clamp the tissues on both sides of the wound under the operator's control, keeping the wound closed for suturing or other procedures, and promoting wound healing. Please refer to [reference needed]. Figure 2 The clamping assembly 100 forms an assembly cavity 101. For example, it can be a cylindrical structure or other structure that can form an assembly cavity 101. The moving member 215 is disposed in the assembly cavity 101 in a manner that allows it to move in the front-back direction under the action of an external force.

[0034] Please refer to Figure 1 The clamping assembly 100 includes a fixed arm 110, a connecting sleeve 130, and a movable arm 120 capable of moving relative to the fixed arm 110. The connecting sleeve 130 is fixedly connected to the fixed arm 110. This fixed connection can be an integrally formed structure or manufactured separately and then fixed together. An integrally formed structure means that the relevant structure is formed from a single part, for example, directly cut from a cylindrical substrate (such as a powder metallurgy sintered sleeve or other sleeve substrate) using laser cutting or other cutting processes. The connecting sleeve 130 is located at the rear end of the fixed arm 110 and forms an assembly cavity 101. The clamping assembly 100 has a clamped state and an open state. When the clamping assembly 100 is in the clamped state, please refer to... Figure 9 The movable arm 120 and the fixed arm 110 form a clamping structure; when the clamping assembly 100 is in the open state, please refer to... Figure 3 The movable arm 120 opens relative to the fixed arm 110. The fixed arm 110 opens and closes automatically without operator control; for example, it can be made of rigid materials such as metal or hard plastic, or its structure may not include any easily bendable features. The operator primarily uses the movement of the movable arm 120 to open and close the entire clamping assembly 100. The fixed arm 110 and the movable arm 120 can be any of the existing structures applicable to this solution.

[0035] Please refer to Figure 2 and 3 The movable arm 120 is fixedly connected to the conversion component 214. This fixed connection can be a one-piece molded structure or manufactured separately and then fixed together. The conversion component 214 is at least partially located within the assembly cavity 101. Figure 2 and 3 In this embodiment, the conversion element 214 is a sliding rocker block; however, in other embodiments, the conversion element 214 may also have other shapes and structures. The conversion element 214 connects the moving element 215 and the movable arm 120 to transmit the force driving the clamping assembly 100 to switch between a clamped state and an open state to the movable arm 120 when the moving element 215 moves. The moving element 215 is used to transmit the forward and backward motion input from the control component 300 to the conversion element 214. Figure 2and 3 In this embodiment, the moving component 215 is a connecting rod; however, in other embodiments, the moving component 215 may also have other shapes and structures. The control component 300 is used to receive instructions input by the operator to generate a force that controls the clamping component 100. The operator's instructions to the control component 300 can be direct input of force and movement, such as manually applying force, or can be electronically controlled, such as using a motor or other driving component to input the relevant force. The control component 300 can be specifically implemented with reference to existing technologies.

[0036] For specific driver architecture details, please refer to [link / reference]. Figure 2 and 3 In some embodiments, the clamping assembly 100 is provided with a fixed shaft 102, for example, the fixed shaft 102 may be provided on the fixed arm 110 or the connecting sleeve 130 of the clamping assembly 100. The conversion member 214 has a sliding engagement portion 2141, which is inclined from front to back and from the movable arm 120 side to the fixed arm 110 side, and the sliding engagement portion 2141 forms a sliding engagement with the fixed shaft 102. The rear end of the conversion member 214 is movably connected to the moving member 215, and the moving member 215 is connected to the control assembly 300. During the movement of the moving member 215 in the front-back direction, the conversion member 214 swings and slides relative to the fixed shaft 102, so that the movable arm 120 opens and closes relative to the fixed arm 110. For example, in Figure 2 In the middle, when the moving part 215 moves backward, it drives the conversion part 214 to move downward, thereby driving the movable arm 120 to close with the fixed arm 110. Figure 2 (Not the extreme position of the backward movement of moving part 215). Figure 3 When the moving part 215 moves forward, it drives the conversion part 214 to move forward and swing relative to the fixed axis 102, thereby driving the movable arm 120 to open relative to the fixed arm 110.

[0037] In the clamping structure described above, the fixed arm 110 and the connecting sleeve 130 are fixedly connected, which can improve the stability of the fixed arm 110. The movable arm 120 is fixed to the conversion member 214. By setting the extension direction of the sliding fit part 2141, the conversion member 214 swings around the fixed axis 102 and slides relative to it during the movement of the moving member 215 in the front-back direction, so that the movable arm 120 opens and closes relative to the fixed arm.

[0038] Furthermore, the sliding fit portion 2141 of the conversion member 214 can be as follows: Figure 2 and 3 The cut shown is a through-type conversion part 214, which can also be a non-through blind slot.

[0039] Furthermore, in one embodiment, please refer to Figure 4The sliding engagement part 2141 has a first curved path 2142 at its front end. When the clamping assembly 100 is in the closed state, the fixed shaft 102 is located within the first curved path 2142, and the movable arm 120 and the fixed arm 110 are closed to form a clamping structure. The direction of movement of the fixed shaft 102 defined by the first curved path 2142 (e.g., Figure 4 As shown in D1) and the opening direction of the movable arm 120 (as shown in Figure 1) Figure 4 (As shown in D2) An included angle α is formed to form a self-locking mechanism for the movable arm 120.

[0040] Specifically, please refer to Figure 4 When the movable arm 120 and the fixed arm 110 are closed and clamp the tissue, the fixed shaft 102 is located within the first curved path 2142. To release the closed state of the movable arm 120 and the fixed arm 110, the fixed shaft 102 needs to be driven to move relative to the first curved path 2142 in the direction shown in D1 (referring to relative movement, actually the movement of the conversion element 214). At this time, there is no external force applied by the operator. The force that drives the movable arm 120 and the fixed arm 110 to open mainly comes from the reaction force of the tissue on the movable arm 120, and this reaction force is mainly concentrated in pushing the movable arm 120 along... Figure 4 The movement is shown in the D2 direction. Since the D1 and D2 directions form a certain angle c, the tissue acts on the movable arm 120 along... Figure 4 The force moving in the direction D2 shown will not easily push the drive fixed shaft 102 to move relative to the first bending path 2142 in the direction shown in D1, thus forming a certain degree of self-locking.

[0041] Of course, the formation of this self-locking effect is related to the size of the angle c between the D1 and D2 directions. Preferably, in one embodiment, please refer to... Figure 4 When the clamping assembly 100 is in the closed state, the movement direction D1 of the fixed shaft 102 defined by the first bending path 2142 is perpendicular to the opening direction D2 of the movable arm 102, i.e., c = 90°.

[0042] Of course, in addition to being perpendicular to each other, in one embodiment, when the clamping assembly 100 is in the closed state, the angle c formed by the movement direction D1 of the fixed shaft 102 defined by the first bending path 2142 and the opening direction D2 of the movable arm 102 has a range of 45°≤c≤135°. This range of values ​​can also effectively achieve the aforementioned self-locking effect.

[0043] Furthermore, in one embodiment, please refer to... Figure 4When the clamping assembly 100 is in the closed state, the first bending path 2142 extends in the front-back direction. At this time, to drive the movable arm 120 to open, the fixed shaft 102 needs to be driven to move backward within the first bending path 2142. It is difficult to rely solely on the reaction force of the tissue on the movable arm 120, thus a certain degree of self-locking can be formed.

[0044] Further, please refer to Figure 3 and 4 In one embodiment, the rear end of the sliding engagement portion 2141 has a second curved path 2143. When the clamping assembly 100 is in the open state, the fixed shaft 102 is located within the second curved path 2143, and the movable arm 120 and the fixed arm 110 form an open structure. The movement direction D3 of the fixed shaft 102 defined by the second curved path 2143 forms an angle e with the closing direction D4 of the movable arm 120, so as to prevent the movable arm 120 from easily moving in the closing direction under the compression of surrounding tissue, thus forming a certain degree of self-locking effect. The angle e can be selected as an obtuse angle, for example, 45°≤e<180°, or for example, 90°.

[0045] Further, please refer to Figure 2 and 3 In one embodiment, to better reduce the motion interference of the moving member 215 on the conversion member 214, some embodiments are described below. Figure 6 The conversion component 214 can be mounted on the sliding shaft 2151 of the moving component 215 through the elongated hole 2142 at its rear end. The extension direction of the elongated hole 2142 is approximately the same as the extension direction of the sliding fit part 2141. Thus, when the conversion component 214 swings, the conversion component 214 can adaptively adjust its positional relationship with the moving component 215 as needed, so as to avoid the movement of the moving component 215 interfering with the movement of the conversion component 214, which would make it difficult for the conversion component 214 to swing in the set direction.

[0046] On the other hand, please refer to Figure 2 In some embodiments, the fixed arm 110 typically has a first hook 111, and the movable arm 120 has a second hook 121. The first hook 111 and the second hook 121 can clamp the tissue by interlocking with each other in the prior art. This method is effective for small wounds (i.e., the wound size is less than or approximately equal to the opening distance of the clamping device). However, when the wound size is much larger than the corresponding clamping device (this application refers to such wounds as large wounds), the existing structure is difficult to successfully pull and clamp the tissues on both sides of these large wounds together.

[0047] Based on the above problems, some embodiments of this application provide a traction-type clamping device that can be used to close large wounds (wound size larger than the normal opening and closing distance of the clamping device) in the body of a patient, thereby achieving hemostasis and wound healing. This traction-type refers to the fact that when the clamping device closes the tissues on both sides of a large wound, it needs to pull the tissues on both sides a considerable distance to the closing point to achieve a closure effect. Although existing clamping devices also have a certain traction effect on the tissues on both sides of a small wound when closing it, the traction distance is short due to the small size of the wound, and the traction effect is not significant. Therefore, this application refers to a closure device capable of pulling the tissues on both sides of a large wound to the closing point as a traction-type clamping device.

[0048] For details, please refer to Figure 5 The front end of the fixed arm 110 has a first hook 111 that bends toward the side where the movable arm 120 is located, and the front end of the movable arm 120 has a second hook 121 that bends toward the side where the fixed arm 110 is located.

[0049] The clamping assembly 100 also has a pre-clamping state. When the clamping assembly 100 is in the pre-clamping state, please refer to... Figure 5 The first hook 111 and the second hook 121 extend opposite each other, and the lengths (i.e., the front-to-back dimensions) of the fixed arm 110 and the movable arm 120 are different. Therefore, the second hook 121 is located in front of the first hook 111 to form an overlapping pre-clamping structure. This overlapping pre-clamping structure enables the fixed arm 110 to firmly engage with the tissue on one side of a large wound, so that when the movable arm 120 hooks the tissue on the other side, the fixed arm 110 can pull the tissue on its side and move it towards the movable arm 120, thereby achieving closure of the entire large wound. Of course, in addition to closing large wounds, this traction clamping device can also be applied to the closure of small wounds.

[0050] The following diagram provides a more detailed explanation of the closing effect.

[0051] Please refer to Figure 6 The operator can use the endoscope to initially locate the target large wound A, and open the movable arm 120 for the first time to prepare to control the clamping component 100 to fix the tissue on one side of the large wound A.

[0052] Please refer to Figure 7After selecting the suture initiation point, a pre-clamping operation is performed, causing the movable arm 120 to move relative to the fixed arm 110 to form a pre-clamping state. The purpose is to maintain the clamping component 100 in a non-released state and use the differentially designed clamping component 100 to pre-clamp the tissue on one side of the large wound A (clamping the tissue but not releasing the clamp). In this step, due to the difference in length between the two clamping arms of the clamping component 100, the fixed arm 110 can be used as an anchor point during pre-clamping. Using the compressive force of the movable arm 120 pulling the tissue, the tip of the fixed arm 110 can penetrate into the tissue at the moment of pre-clamping to form an initial anchor point.

[0053] More specifically, such as Figure 7 As shown by the middle arrow, the fixed arm 110 and the movable arm 120 can clamp the tissue in a relative manner, thereby forming two clamping forces in opposite directions. The restriction of the internal space at the intersection of the fixed arm 110 and the movable arm 120 leads to an increase in the surface tension of the tissue. Under the action of tension, the tissue is more easily punctured and fixed by the bent part between the teeth of the fixed arm 110, thereby forming an effective hooking effect.

[0054] Please refer to Figure 8 After pre-clamping is completed, a second opening operation can be performed. The operator can control the movable arm 120 to open again via a control handle (refer to the control handle of existing clamping devices). Since the movable arm 120 can be directly controlled by the operator to open, it is easier for it to detach from the tissue. After the movable arm 120 is opened, the spatial orientation of the clamping component 100 is adjusted using the matching endoscopic positioning function, so that the end of the movable arm 120 is precisely hooked onto the tissue on the opposite edge of the large wound A.

[0055] Then, please refer to Figure 9 Once the movable arm 120 hooks onto the tissue on the opposite side of the large wound A, the clamping assembly can be closed via the control handle. During this process, the fixed arm 110 continuously maintains the tissue anchorage, preventing the tissue from easily dislodging. This pulls the tissue on one side of the large wound A, which is fixed by the fixed arm 110, towards the other side, so that the fixed arm 110 and the movable arm 120 work together to clamp the tissue on both sides of the large wound A for effective suturing.

[0056] Furthermore, in the above Figure 1-5 The illustrated embodiment shows an example where, in the closed state, the movable arm 120 is longer than the fixed arm 110, and therefore the second hook 121 is located in front of the first hook 111. However, in other embodiments, please refer to... Figure 10In the closed state, the fixed arm 110 can also be longer than the movable arm 120. Therefore, the first hook 111 is located in front of the second hook 121, thus forming an overlapping pre-clamping structure. This clamping structure can also be pre-clamped so that the fixed arm 110 first fixes one side of the tissue, and then the other side of the tissue is hooked by controlling the opening of the movable arm 120. Finally, the closure of the clamping assembly 100 causes the two sides of the tissue to approach and close each other.

[0057] Furthermore, in order to form the first hook portion 111 and the second hook portion 121, please refer to... Figure 11 In some embodiments, the fixed arm 110 has a first arm body 112, and a first hook 111 bends from the front end of the first arm body 112 toward the movable arm 120. The movable arm 120 has a second arm body 122, and a second hook 121 bends from the second arm body 122 toward the fixed arm 110.

[0058] In some embodiments, the bending angle α of the first hook 111 is in the range of 45°≤a≤160°; and / or, the bending angle b of the second hook 121 is in the range of 45°≤b≤160°.

[0059] In other embodiments, the bending angle 'a' of the first hook 111 ranges from 55° ≤ a ≤ 140°; and / or, the bending angle 'b' of the second hook 121 ranges from 55° ≤ b ≤ 140°. This limitation of bending angles allows the fixed arm 110 and / or the movable arm 120 to prevent slippage after insertion into the tissue through a locking effect, thereby providing more stable mechanical support when pulling the tissue and ensuring the reliability of the clamping. For example... Figure 11 The image shows that the fixed arm 110 has bending angles of 70°, 90° and 110° respectively, and the movable arm 120 can also have bending angles of 70°, 90° and 110°.

[0060] Furthermore, in some embodiments, to facilitate easier insertion of the fixed arm 110 and the movable arm 120 into the tissue, the ends of the first hook portion 111 and / or the second hook portion 121 have pointed structures that facilitate piercing the target tissue. These pointed structures increase the sharpness of the ends of the fixed arm 110 and the movable arm 120, increasing the single-point pressure when the fixed arm 110 and the movable arm 120 pierce the tissue, reducing the resistance to piercing the tissue mucosa, and thus making it easier to penetrate the tissue. The pointed structure may include, but is not limited to, the following shapes: such as... Figure 12 The wavy pattern shown (the differences between the examples lie in the distance between the crests and troughs of the wave) Figure 13 The arrow shape shown and Figure 14 The double-pointed spikes shown (the differences between the examples are in the height of the spikes), etc.

[0061] Of course, during use, this clamping structure also needs to detach the clamping components and related structures that maintain the clamping state from the clamping device so that they remain inside the body of the patient. These detachment structures can be implemented with reference to existing technologies.

[0062] The above-described specific examples are for illustrative purposes only and are not intended to limit the scope of this invention. Those skilled in the art can make various simple deductions, modifications, or substitutions based on the concept of this invention.

Claims

1. A clamping structure of a tension-type clamping device, characterized by comprising: include: A clamping assembly, comprising a connecting sleeve, a fixed arm, and a movable arm capable of moving relative to the fixed arm, wherein the fixed arm is fixedly connected to the connecting sleeve, and a fixed shaft is provided on the fixed arm or the connecting sleeve. A moving part, the moving part being used to move back and forth within the connecting sleeve under the control of an operator; And a conversion component, the conversion component being at least partially located within the connecting sleeve, the movable arm being fixedly connected to the conversion component, and the rear end of the conversion component being movably connected to the moving component; The conversion component has a sliding engagement portion, which is inclined from front to back and from the movable arm side to the fixed arm side. The sliding engagement portion forms a sliding engagement with the fixed shaft. During the movement of the movable component in the front-back direction, the conversion component swings around the fixed shaft and slides relative to it, so that the movable arm opens and closes relative to the fixed arm.

2. The clamp structure of claim 1, wherein The front end of the sliding engagement part has a first curved path. When the clamping assembly is in the closed state, the fixed shaft is located within the first curved path, and the movable arm and the fixed arm are closed to form a clamping structure. The movement direction of the fixed shaft defined by the first curved path forms an angle with the opening direction of the movable arm to form a self-locking mechanism for the movable arm.

3. The clamp structure of claim 2, wherein When the clamping assembly is in the closed state, the first bending path extends in the front-to-back direction.

4. The clamping structure as described in claim 2, characterized in that, When the clamping assembly is in the closed state, the direction of motion of the fixed axis defined by the first bending path is perpendicular to the opening direction of the movable arm.

5. The clamping structure as described in claim 2, characterized in that, When the clamping assembly is in the closed state, the angle c formed by the fixed shaft movement direction defined by the first bending path and the opening direction of the movable arm has a range of 45°≤c≤135°.

6. The clamping structure as described in claim 1, characterized in that, The rear end of the sliding mating part has a second curved path. When the clamping assembly is in the open state, the fixed shaft is located in the second curved path, and the movable arm and the fixed arm form an open structure. The movement direction of the fixed shaft defined by the second curved path forms an angle with the closing direction of the movable arm, so as to prevent the movable arm from easily moving in the closing direction under the compression of the surrounding tissue.

7. The clamping structure as described in claim 1, characterized in that, The rear end of the conversion component has an elongated hole, and a sliding shaft is fixed on the moving component. The elongated hole slides with the sliding shaft. The elongated hole extends from front to back and is inclined from the side of the movable arm to the side of the fixed arm, so as to adaptively adjust its position relative to the moving component when the conversion component swings.

8. The clamping structure as described in any one of claims 1-7, characterized in that, The front end of the fixed arm has a first hook that bends toward the side where the movable arm is located, and the front end of the movable arm has a second hook that bends toward the side where the fixed arm is located; the clamping assembly has a pre-clamping state, a clamping state, and an open state. When the clamping assembly is in the pre-clamping state, the first hook and the second hook extend relative to each other, and the first hook is located in front of the second hook or the second hook is located in front of the first hook, forming an overlapping pre-clamping structure so that the fixed arm can pierce and fix one side of the wound tissue; When the clamping assembly is in the clamping state, the first hook and the second hook can pull and close the tissues on both sides of the wound. When the clamping assembly is in the open state, the movable arm is open relative to the fixed arm.

9. The clamping structure as described in claim 8, characterized in that, The bending angle α of the first hook is in the range of 55°≤a≤140°; And / or, the bending angle b of the second hook is in the range of 55°≤b≤140°.

10. A traction-type clamping device, characterized in that, It includes the clamping structure as described in any one of claims 1-9.

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