Clamping nozzle assembly and vascular clamp
By incorporating an inclined bottom surface and a sloping bottom surface connected to the support leg of the vascular clamp in the clamping assembly, the problem of misalignment or deviation of the vascular clamp during clamping is solved, achieving stable clamping and smooth disengagement, thus improving surgical safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- MEDSCOPE BIOTECH CO LTD
- Filing Date
- 2025-03-31
- Publication Date
- 2026-04-14
AI Technical Summary
Traditional vascular clamps are prone to getting stuck or difficult to detach from the clamping assembly, and the two legs may misalign or detach during clamping, increasing surgical risks.
A clamping assembly was designed, comprising a setting groove with an inclined bottom surface and a vascular clamp. The inclined bottom surface abuts against the connection of the vascular clamp's legs to ensure that the legs do not shift in the height direction. The vascular clamp is kept stable and can be easily disengaged through the cooperation of the inclined bottom surface and the side wall surface.
It effectively prevents the vascular clamp from becoming misaligned or detached during clamping, reduces the risk of tissue damage, improves surgical safety, and ensures the smooth entry and exit of the vascular clamp, reducing the possibility of snagging or operational difficulties.
Smart Images
Figure CN224112717U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a surgical instrument, and more particularly to a clamping nozzle assembly of a vascular clamp applicator. Background Technology
[0002] A vascular clip is a medical device frequently used in surgery for ligation. It is used to ligate or bind blood vessels or other body tissues to prevent fluid flow or for fixation. During surgery, the surgeon uses an applicator to place the vascular clip in the body tissue. The applicator typically has a clamping nozzle assembly, and the vascular clip is positioned within the grooves of the clamping nozzle assembly.
[0003] Traditional vascular clips are formed by bending a thin strip with a rectangular cross-section. Generally, the width between the two side walls of the groove in a traditional clip assembly is the same as the height of the vascular clip. However, due to tolerances or thermal expansion and contraction, the vascular clip may be difficult to insert into the groove or difficult to detach from it. During surgery, this situation may result in the operator being unable to separate the clip and the vascular clip after applying the clip to the patient, ultimately requiring the removal of the stuck clip and re-application. This not only wastes time and the operator's energy but also adds risks to the surgical procedure.
[0004] To address the aforementioned issues, some manufacturers have widened the grooves in the clamping assembly to allow the vascular clamp to easily enter and exit the clamping assembly. However, this approach has introduced another problem, which is explained in detail below.
[0005] The method of using vascular clamps to ligate body tissue involves first positioning the tissue between its two arms, then aligning and clamping the arms onto the tissue. However, because the grooves in the clamping nozzles are widened, the vascular clamp has a degree of freedom in the vertical direction. This can lead to the two legs of the clamp not being on the same height plane during clamping, resulting in misalignment and clamping failure. Alternatively, asymmetrical clamping forces may cause the ends of the clamp's legs to flare outwards, forming what is commonly known as "scissor legs." Such vascular clamps could potentially injure other body tissues during subsequent surgery or interfere with the surgeon's operation.
[0006] Therefore, it is clear that traditional clamp components and vascular clamps do need to be improved. Utility Model Content
[0007] The main objective of this invention is to provide a solution that prevents the two legs of the vascular clamp from misaligning or branching out after being clamped by the vascular clamp applicator, and allows the vascular clamp to be easily removed from the vascular clamp applicator after clamping.
[0008] To achieve the aforementioned objectives, this utility model provides a clamping nozzle assembly for use in a vascular clamp applicator, the clamping nozzle assembly comprising:
[0009] A base and two arms, the two arms being connected to the base and spaced apart from each other and arranged side by side, the two arms being movable relative to each other; each arm having:
[0010] A recessed groove is formed on the side of the support arm facing the other support arm; the recessed groove has:
[0011] A first sidewall and a second sidewall, the first sidewall and the second sidewall being spaced apart from each other and facing each other;
[0012] A first sloping bottom surface, one side of which is connected to the first side wall, and the other side extends toward the second side wall;
[0013] A second sloping bottom surface, one side of which is connected to the second sidewall, and the other side extending toward the first sidewall; and
[0014] A groove bottom surface, with its two sides respectively connected to the first inclined bottom surface and the second inclined bottom surface;
[0015] The groove has a height direction, and the width direction of the first inclined bottom surface is inclined relative to the height direction and has a first included angle, and the width direction of the second inclined bottom surface is inclined relative to the height direction and has a second included angle.
[0016] To achieve the aforementioned objectives, this utility model also proposes a vascular clamp, which can be disposed in the clamping mouth assembly as described above. The vascular clamp has two legs and a connecting portion, the connecting portion connecting between the two legs; each leg has:
[0017] An inner side and an outer side, the inner side and the outer side being located on opposite sides of the support leg, with the inner side facing the other support leg;
[0018] A top surface, which connects the inner side surface and the outer side surface; and
[0019] The lower top surface connects the inner side surface and the outer side surface, and the lower top surface and the upper top surface are located on opposite sides respectively;
[0020] When the blood vessel clamp is installed on the clamping nozzle assembly, the connection between the upper top surface and the outer side surface abuts against the first inclined bottom surface; and the connection between the lower top surface and the outer side surface abuts against the second inclined bottom surface.
[0021] Therefore, the advantage of this invention lies in the fact that a first inclined bottom surface and a second inclined bottom surface are provided in the groove, so that the position of the vascular clamp's legs in the height direction can be maintained without deviation when the support arm moves. Furthermore, the vascular clamp's legs can be further matched so that the connection between the outer side surface and the upper and lower top surfaces abuts against the first and second inclined bottom surfaces, so that the position of the vascular clamp's legs in the height direction can be maintained without deviation when the support arm moves.
[0022] As described above, in the clamping assembly, the width of the first inclined bottom surface is greater than or equal to the width of the second inclined bottom surface.
[0023] As described above, the clamping assembly, wherein the first included angle is between 20 degrees and 50 degrees and / or the second included angle is between 20 degrees and 50 degrees.
[0024] As described above, in the clamping assembly, the distance between the first sidewall and the second sidewall of the setting groove of each arm gradually increases toward the other arm.
[0025] As described above, the mounting slot of each of the arms further has a lateral direction, wherein the angle between the width direction of the first sidewall and the lateral direction is between 2 degrees and 10 degrees, and / or the angle between the width direction of the second sidewall and the lateral direction is between 2 degrees and 10 degrees.
[0026] As described above, in the clamping assembly, the mounting groove of each arm has an extending direction, and the mounting groove extends through the arm along the extending direction.
[0027] As described above, in the clamping assembly, the mounting groove of each arm has an extending direction, each arm has a first end and a second end opposite to each other in the extending direction, and the second end is located between the base and the first end. The first end has an opening and the second end is closed, and the opening of the first end is in communication with the mounting groove.
[0028] As described above, the vascular clamp has a lower top surface that protrudes away from the upper top surface.
[0029] As described above, the vascular clamp has a convex arc surface on its lower top surface. Attached Figure Description
[0030] Figure 1 This is a three-dimensional view of the portion of the clamping nozzle assembly of the present invention disposed in a continuously firing vascular clamp applicator, according to a first embodiment of the present invention.
[0031] Figure 2 This is a three-dimensional appearance schematic diagram of the first embodiment of the clamping mouth assembly of the present invention, in which a blood vessel clamp is disposed on the clamping mouth assembly.
[0032] Figure 3 for Figure 1 A front view diagram.
[0033] Figure 4 This is a partially enlarged perspective view of the first embodiment of the clamping assembly of the present invention, showing the sliding wedge.
[0034] Figure 5 This is a partially enlarged perspective view of the first embodiment of the clamping nozzle assembly of the present invention, showing the setting part.
[0035] Figure 6 This is a partially enlarged perspective view of the first embodiment of the clamping nozzle assembly of the present invention, showing the setting part from another perspective.
[0036] Figure 7 This is a front view schematic diagram of the first embodiment of the clamping assembly of this utility model.
[0037] Figure 8 for Figure 7 An enlarged schematic diagram of one of the arms.
[0038] Figure 9 for Figure 3 A partially enlarged schematic diagram.
[0039] Figure 10 This is a schematic diagram of a first embodiment of the clamping nozzle assembly of this invention, showing the clamping device in a continuous-fire clamping device entering the clamping nozzle.
[0040] Figure 11 This is a three-dimensional view of the second embodiment of the clamping nozzle assembly of the present invention, set in a single-shot vascular clamp applicator.
[0041] Figure 12 This is a three-dimensional appearance schematic diagram of one embodiment of the blood vessel clamp of this utility model.
[0042] Figure 13 for Figure 12 A front view diagram. Detailed Implementation
[0043] The following, in conjunction with the accompanying drawings and preferred embodiments of the present invention, further illustrates the technical means employed by the present invention to achieve its intended purpose.
[0044] Please refer to the following first. Figure 1 and Figure 2 The present invention provides a first embodiment of a clamping nozzle assembly 10 for use in a vascular clamp applicator.
[0045] The clamp assembly 10 includes a base 11 and two arms 12 connected to the base 11. The base 11 is used to connect to other components of the vascular clamp applicator (not shown in the figure), and its form can be adjusted according to the actual connection method, and is not limited to what is shown in this embodiment.
[0046] Two arms 12 are arranged side by side and spaced apart from each other, and the two arms 12 are movable relative to each other. Specifically, each arm 12 is connected to the base 11 at one end and extends away from the base 11 at the other end. The end of each arm 12 away from the base 11 can approach or move away from the other arm 12, thereby enabling the clamping assembly 10 to clamp a vascular clamp 20 disposed between the two arms 12 and further deform the vascular clamp 20.
[0047] Please refer to Figures 2 to 6 Each arm 12 has a recess 122, which is formed on the side of arm 12 facing the other arm 12, and the vascular clamp 20 can be clamped by the recess 122 of the two arms 12. In this embodiment, as Figure 5 and Figure 6 As shown, the mounting groove 122 of each arm 12 has an extension direction E1, a height direction H and a lateral direction L that are perpendicular to each other, and the mounting groove 122 extends through the arm along the extension direction E1; the end of the mounting groove 122 facing the base 11 is inclined away from the other arm 12 in the lateral direction L, thereby forming a larger opening to facilitate the entry of the vascular clamp 20, but not limited thereto.
[0048] Please refer to Figures 5 to 9 Specifically, in this embodiment, each arm 12 protrudes at one end away from the base 11 in the height direction H to form a setting part 121, and a setting groove 122 is recessed in the setting part 121 in the lateral direction L and extends through the setting part 121 in the extension direction E1, but is not limited thereto.
[0049] The groove 122 has a first side wall 1221, a second side wall 1222, a first inclined bottom surface 1223, a second inclined bottom surface 1224, and a groove bottom surface 1225.
[0050] The first sidewall 1221 and the second sidewall 1222 are spaced apart from each other and face each other. In this embodiment, the distance between the first sidewall 1221 and the second sidewall 1222 of the mounting groove 122 of each arm 12 gradually increases in the direction toward the other arm 12, thereby facilitating the entry or exit of the vascular clamp 20 into or out of the mounting groove 122, but not limited thereto.
[0051] The lateral direction L is approximately perpendicular to the height direction H. The angle between the width direction W1 of the first side wall 1221 and the lateral direction L is between 2 degrees and 10 degrees, and the angle between the width direction W2 of the second side wall 1222 and the lateral direction L is between 2 degrees and 10 degrees. However, this is not a limitation. It is possible that only the angle between the width direction W1 of the first side wall 1221 and the lateral direction L is between 2 degrees and 10 degrees, or only the angle between the width direction W2 of the second side wall 1222 and the lateral direction L is between 2 degrees and 10 degrees.
[0052] One side of the first inclined bottom surface 1223 is connected to the first side wall 1221, and the other side extends toward the second side wall 1222; similarly, one side of the second inclined bottom surface 1224 is connected to the second side wall 1222, and the other side extends toward the first side wall 1221. In this embodiment, the width of the first inclined bottom surface 1223 is greater than or equal to the width of the second inclined bottom surface 1224, but is not limited thereto.
[0053] Specifically, the width direction W3 of the first inclined bottom surface 1223 is inclined relative to the height direction H, and a first included angle C1 is formed between the width direction W3 and the height direction H. Similarly, the width direction W4 of the second inclined bottom surface 1224 is inclined relative to the height direction H, and a second included angle C2 is formed between the width direction W4 and the height direction H. In this embodiment, the first included angle C1 is between 20 degrees and 50 degrees, and the second included angle C2 is between 20 degrees and 50 degrees, but this is not a limitation. It is possible that only the first included angle C1 is between 20 degrees and 50 degrees, or only the second included angle C2 is between 20 degrees and 50 degrees.
[0054] The bottom surface 1225 of the groove is connected to the first inclined bottom surface 1223 and the second inclined bottom surface 1224 on both sides. In this embodiment, the width direction W5 and the height direction H of the bottom surface 1225 of the groove are parallel to each other, but are not limited thereto.
[0055] like Figure 1 , Figure 2 ,and Figure 4 As shown, in this embodiment, each of the two arms 12 can protrude to form a sliding wedge 123, which is used to slide and engage with a clamping block 90. In this way, the clamping block 90 can drive the two arms 12 to approach or move away from each other. In this embodiment, the sliding wedge 123 and the setting part 121 are located on opposite sides of the arms 12, but this is not a limitation.
[0056] like Figure 1 , Figure 2 and Figure 10As shown, the first embodiment of the clamping assembly 10 of this utility model can be used in a multi-shot vascular clamp applicator. The vascular clamp 20 can move from one end of the setting groove 122 near the base 11 along the extending direction E1 of the setting groove 122 into the setting groove 122, but is not limited thereto.
[0057] Please refer to Figure 11 This is a second embodiment of the clamping assembly 10A of the present invention, which is largely the same as the first embodiment, except that the supporting arm 12A in the second embodiment does not have a mounting portion. Instead, each supporting arm 12A has a first end 124A and a second end 125A in the extending direction E2 of the mounting groove 122A, with the second end 125A located between the base 11A and the first end 124A. The first end 124A has an opening 1241A, while the second end 125A is closed, and the opening 1241A of the first end 124A is in communication with the mounting groove 122A.
[0058] The clamp assembly 10A of the second embodiment can be used for a single-shot vascular clamp applicator, wherein the single-shot vascular clamp applicator is not limited to the type shown in this embodiment (minimally invasive gun type), for example, it can also be a scissor type single-shot vascular clamp applicator; the vascular clamp can enter the setting groove 122A through the opening 1241A of the first end 124A of the support arm 12A, thereby setting the vascular clamp on the two supports 12A.
[0059] Please refer to the following: Figure 3 , Figure 9 , Figure 12 and Figure 13 The vascular clamp 20 proposed in this utility model can be fitted into the clamping nozzle assembly 10 as described above. The vascular clamp 20 has two legs 21 and a connecting part 22, and the connecting part 22 is connected between the two legs 21.
[0060] In this embodiment, the two legs 21 and the connecting part 22 can be integrally formed from a long strip of metal wire. The connecting part 22 is connected to one end of the two legs 21 and bent, thereby forming a U-shape for the blood vessel clamp 20 as a whole, but it is not limited to this.
[0061] Each leg 21 has an inner side 211, an outer side 212, an upper top surface 213, and a lower top surface 214. The inner side 211 and the outer side 212 are located on opposite inner and outer sides of the leg 21, with the inner side 211 facing the other leg 21. The upper top surface 213 and the lower top surface 214 are connected between the inner side 211 and the outer side 212, and are also located on opposite upper and lower sides of the leg 21.
[0062] In this embodiment, the lower top surface 214 protrudes away from the upper top surface 213 and forms a convex arc surface. Similarly, the upper top surface 213 protrudes away from the lower top surface 214 and forms a convex arc surface. However, this is not a limitation, and the forms of the upper top surface 213 and the lower top surface 214 can be adjusted as needed.
[0063] Please refer to this as well. Figure 3 and Figure 8 In this embodiment, the minimum distance between the first sidewall 1221 and the second sidewall 1222 of the groove 122 can be greater than the maximum distance between the upper top surface 213 and the lower top surface 214 of the vascular clamp 20, but is not limited thereto. When the vascular clamp 20 is disposed on the clamping nozzle assembly 10, the connection between the upper top surface 213 and the outer side surface 212 abuts against the first inclined bottom surface 1223, and the connection between the lower top surface 214 and the outer side surface 212 abuts against the second inclined bottom surface 1224.
[0064] Specifically, please refer to Figure 3 and Figure 9 When the vascular clamp 20 is placed on the clamping assembly 10, since the upper top surface 213 of the leg 21 of the vascular clamp 20 is spaced from the first side wall 1221 of the setting groove 122, and the upper top surface 213 and lower top surface 214 of the leg 21 of the vascular clamp 20 in this embodiment are convex arc surfaces; simply put, the width of the setting groove 122 is slightly greater than the height of the leg 21 and the angle of the edge of the surface of the leg 21 is large, therefore, when the two arms 12 of the clamping assembly 10 approach each other and clamp and deform the vascular clamp 20, the leg 21 of the vascular clamp 20 can smoothly slide along the first side wall 1221 and the second side wall 1222 to the connection between the upper top surface 213 and the outer side surface 212 and abut against the first inclined bottom surface 1223, and the connection between the lower top surface 214 and the outer side surface 212 abuts against the second inclined bottom surface 1224.
[0065] Since the first inclined bottom surface 1223 and the second inclined bottom surface 1224 are inclined relative to the height direction H, when the support arm 12 pushes the support leg 21 of the blood vessel clamp 20 in the direction of the other support arm 12, the position of the connection between the outer side surface 212 of the support leg 21 and the upper top surface 213 and the lower top surface 214 against the first inclined bottom surface 1223 and the second inclined bottom surface 1224 can be fixed.
[0066] Furthermore, in this embodiment, the width of the first inclined bottom surface 1223 is greater than the width of the second inclined bottom surface 1224, and the lower top surface 214 of the support leg 21 abuts against the second side wall surface 1222, thereby fixing the position of the support leg 21 relative to the support arm 12 in the height direction H without displacement. In addition, in this embodiment, the structures of the two arms 12 of the clamping assembly 10 are symmetrical, so that the setting grooves 122 of the two arms 12 are in the same position in the height direction H. Therefore, the two legs 21 can remain closed on the same height plane without misalignment or separation that could cause scissor-like movements.
[0067] Finally, after the two legs 21 of the vascular clamp 20 are clamped and closed, the two arms 12 of the clamping nozzle assembly 10 separate from each other. Since the distance between the first side wall 1221 and the second side wall 1222 gradually expands towards the other arm 12, the vascular clamp 20 can be smoothly released without getting stuck in the setting groove 122.
[0068] The clamping assembly 10 of this utility model can be used to apply the vascular clamp 20 of this utility model, but is not limited thereto. The clamping assembly 10 of this utility model can also apply other types of vascular clamps, such as vascular clamps with elliptical, circular or rectangular leg cross-sectional shapes.
[0069] In this invention, the upper top surface 213 and lower top surface 214 of the leg 21 of the vascular clamp 20 can be convex arc surfaces, thereby making it easier for the leg 21 to enter or leave the mounting groove 122 without getting stuck or obstructed. In addition, when the lower top surface 214 is convex arc surface, when the leg 21 is located in the mounting groove 122 and the connection between the outer side surface 212 and the upper top surface 213 and the lower top surface 214 abuts against the first inclined bottom surface 1223 and the second inclined bottom surface 1224, the lower top surface 214 can abut against the second side wall surface 1222. Therefore, the leg 21 can be supported by at least three directions, so that the position of the leg 21 relative to the mounting groove 122 is fixed and will not shift. In this way, when the two arms 12 of the clamping assembly 10 of this invention approach each other to clamp the vascular clamp 20, the two legs 21 can be kept on the same height plane, thus avoiding misalignment or deviation that would cause scissor legs.
[0070] In summary, the advantages of this utility model are that a first inclined bottom surface 1223 and a second inclined bottom surface 1224 are provided in the groove 122, and the support leg 21 of the vascular clamp 20 can be matched with it. The connection between the outer side surface 212 and the upper top surface 213 and the lower top surface 214 abuts against the first inclined bottom surface 1223 and the second inclined bottom surface 1224, so that when the support arm 12 moves, the position of the support leg 21 of the vascular clamp 20 in the height direction H can be maintained without deviation; in addition, the support leg 21 can be further made to... The convex arc-shaped lower top surface 214 abuts against the second side wall 1222, thereby providing support from at least three directions to the support leg 21. This allows the support leg 21 to remain at the same height during clamping. Thus, the clamping assembly 10 of this invention ensures that the support leg 21 of the vascular clamp 20 remains at the same height during clamping and closing, preventing misalignment or separation, reducing the risk of damage to the patient's tissues and improving surgical safety. Furthermore, the width of the first inclined bottom surface 1223 is greater than the width of the second inclined bottom surface 1224, preventing the support leg 21 from being stably positioned simultaneously against both the first inclined bottom surface 1223 and the first side wall 1221, and instead causing it to tend to move towards the second side wall 1222. The configuration of the setting groove 122 and the configuration of the support leg 21 of the vascular clamp 20 in this utility model can also facilitate the smooth entry and exit of the support leg 21 of the vascular clamp 20 into and out of the setting groove 122, reducing the occurrence of jamming or unsmooth clamping.
[0071] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model's technical solution. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the content of the present utility model's technical solution shall still fall within the scope of the present utility model's technical solution.
Claims
1. A clamping assembly, characterized in that, For use in a vascular clamp applicator, and the clamping nozzle assembly includes: A base and two arms, the two arms being connected to the base and spaced apart from each other and arranged side by side, the two arms being movable relative to each other; each arm having: A recessed groove is formed on the side of the support arm facing the other support arm; the recessed groove has: A first sidewall and a second sidewall, the first sidewall and the second sidewall being spaced apart from each other and facing each other; A first sloping bottom surface, one side of which is connected to the first side wall, and the other side extends toward the second side wall; A second sloping bottom surface, one side of which is connected to the second sidewall, and the other side extends toward the first sidewall; and A groove bottom surface, with its two sides respectively connected to the first inclined bottom surface and the second inclined bottom surface; The groove has a height direction, and the width direction of the first inclined bottom surface is inclined relative to the height direction and has a first included angle, and the width direction of the second inclined bottom surface is inclined relative to the height direction and has a second included angle.
2. The clamping assembly according to claim 1, characterized in that, The width of the first sloping base is greater than or equal to the width of the second sloping base.
3. The clamping assembly according to claim 1 or 2, characterized in that, The first included angle is between 20 degrees and 50 degrees and / or the second included angle is between 20 degrees and 50 degrees.
4. The clamping assembly according to claim 1 or 2, characterized in that, The distance between the first side wall and the second side wall of the mounting slot of each arm gradually increases toward the other arm.
5. The clamping assembly according to claim 4, characterized in that, The mounting slot of each of the arms further has a lateral direction, wherein: The angle between the width direction of the first sidewall and the lateral direction is between 2 degrees and 10 degrees, and / or the angle between the width direction of the second sidewall and the lateral direction is between 2 degrees and 10 degrees.
6. The clamping assembly according to claim 1 or 2, characterized in that, The mounting slot of each arm has an extending direction, and the mounting slot extends through the arm along the extending direction.
7. The clamping assembly according to claim 1 or 2, characterized in that, Each of the support arms has an extending direction in the mounting groove, and each support arm has a first end and a second end opposite to each other in the extending direction. The second end is located between the base and the first end. The first end has an opening and the second end is closed. The opening of the first end is in communication with the mounting groove.
8. A blood vessel clamp, characterized in that, The clamp assembly according to any one of claims 1 to 7, the vascular clamp having two legs and a connecting portion connected between the two legs; each leg having: An inner side and an outer side, the inner side and the outer side being located on opposite sides of the support leg, with the inner side facing the other support leg; A top surface, which connects the inner side surface and the outer side surface; and The lower top surface connects the inner side surface and the outer side surface, and the lower top surface and the upper top surface are located on opposite sides respectively; When the blood vessel clamp is installed on the clamping nozzle assembly, the connection between the upper top surface and the outer side surface abuts against the first inclined bottom surface; and the connection between the lower top surface and the outer side surface abuts against the second inclined bottom surface.
9. The vascular clamp according to claim 8, characterized in that, The lower top surface protrudes away from the upper top surface.
10. The vascular clamp according to claim 9, characterized in that, The bottom surface is a convex arc surface.