A hemostatic clip

Abstract

The present application discloses a hemostatic clamp, which relates to the technical field of hemostatic clamps, and includes a clamping part, including a clamping sleeve, a clamping plate, a bending plate, and a driving column; the bending plate is arranged on the clamping sleeve, and the clamping plates are symmetrically arranged and respectively connected to the two ends of the bending plate; the driving column is slidably arranged in the clamping sleeve, and the driving column is rotatably connected to the bending plate; expansion plates are respectively slidably arranged on the opposite sides of the clamping plate, and the clamping plate is provided with a guide column, and the guide column guides the expansion plate to slide out of the clamping plate; a driving component is connected to the clamping sleeve and the clamping plate, and when the driving column rotates, the driving component drives the expansion plate to slide out of the clamping plate. The present application can improve the hemostasis speed.

Description

Technical Field

[0001] The present application relates to the technical field of hemostatic clips, and in particular to a hemostatic clip. Background Art

[0002] A hemostatic clip is a device that compresses, squeezes or clamps blood vessels to stop bleeding or reduce bleeding. It is widely used in surgical operations to clamp human blood vessels and tissues to stop bleeding.

[0003] At present, the existing hemostatic clip includes a clamp and a clip, wherein the clamp is the handle part of the hemostatic clip, which is usually made of medical-grade stainless steel or other metal materials that meet medical standards, and is used to control the opening and closing of the hemostatic clip. The clip is the main part of the hemostatic clip, which is used to clamp blood vessels or tissues. The clip is usually made of medical-grade materials such as elastic stainless steel or cobalt-chromium alloy to ensure its strength and corrosion resistance.

[0004] However, in actual use, it is found that the width of the clip is narrow, resulting in a limited area of ​​wound closure. Therefore, multiple hemostatic clips need to be used multiple times to stop bleeding on a large wound, and this operation method also reduces the speed of hemostasis. Summary of the invention

[0005] In order to improve the hemostasis speed, the present application provides a hemostatic clip.

[0006] The present application provides a hemostatic clip, which adopts the following technical solution:

[0007] A hemostatic clip comprising

[0008] The clamping part includes a clamping sleeve, a clamping plate, a bending plate and a driving column;

[0009] The bending plate is arranged on the clamping sleeve, and the clamping plates are symmetrically arranged and respectively connected to two ends of the bending plate;

[0010] The driving column is slidably disposed in the clamping sleeve, and the driving column is rotatably connected to the bending plate;

[0011] An expansion plate is slidably arranged on opposite sides of the clamping plate, and the clamping plate is provided with a guide column, and the guide column guides the expansion plate to slide outward of the clamping plate;

[0012] The driving assembly is connected to the clamping sleeve and the clamping plate. When the driving column rotates, the driving assembly drives the expansion plate to slide out of the clamping plate.

[0013] By adopting the above technical solution, the clamping part is composed of a clamping sleeve, a clamping plate, a bending plate and a driving column. The clamping plates are symmetrically arranged and connected to the clamping sleeve through the bending plate. The driving column is slidably inserted into the clamping sleeve and rotatably connected to the bending plate. When the driving column rotates, the expansion plate arranged relatively slides out of the clamping plate through the action of the driving assembly, thereby effectively clamping and compressing the wound or blood vessel, achieving the purpose of hemostasis, reducing the number of hemostatic clips used, and improving the efficiency of hemostasis.

[0014] Optionally, the driving assembly includes a bearing column, a driving airbag, an air storage airbag, a connecting pipe, a driving block and an extrusion ring;

[0015] The bearing column is disposed in the clamping sleeve, and the driving column slides on the bearing column;

[0016] The air storage airbag is arranged in the bearing column, the driving airbag is arranged in the guide column, the driving block slides on the guide column, and when the driving airbag is expanded, the driving block drives the expansion plate to slide;

[0017] The connecting pipe connects the driving airbag and the air storage airbag;

[0018] A sliding groove for the extrusion ring to slide up and down is formed on the side of the bearing column away from the bending plate, the extrusion ring is threadedly connected to the groove wall around the sliding groove, and the air storage bag is connected to the extrusion ring on the side away from the bending plate;

[0019] The driving column slides on the extrusion ring. A linkage column is arranged on the outer peripheral side of the driving column. The linkage column slides up and down on the extrusion ring.

[0020] By adopting the above technical solution, when the driving column rotates, the gas in the air storage bag enters the driving bag through the connecting pipe through the interaction between the linkage column and the extrusion ring, thereby driving the driving block and the connected expansion plate to slide outward. The threaded connection design of the extrusion ring ensures its stable sliding in the slide groove, and at the same time can adjust the compression degree of the air storage bag according to the rotation of the driving column, thereby controlling the inflation amount of the driving bag and realizing the control of the sliding amount of the expansion plate.

[0021] Optionally, a connecting ring is rotatably connected to a side of the extrusion ring close to the air storage bag, and the connecting ring is connected to the air storage bag.

[0022] By adopting the above technical solution, a connecting ring is added to the driving assembly, which is rotatably connected to the side of the extrusion ring close to the air storage bag and connected to the air storage bag, thereby reducing the friction between the extrusion ring and the air storage bag when rotating.

[0023] Optionally, the expansion board includes two sets of board bodies, the driving airbags are symmetrically arranged, and the driving blocks correspond to the driving airbags one by one;

[0024] Each group of plates has a plurality of plates arranged at intervals, and adjacent plates in the same group are arranged to slide relative to each other;

[0025] The driving block drives the two groups of plates to slide in opposite directions;

[0026] The clamping plate is provided with a control component. When the plate body slides away from the clamping plate, the control component controls the plate body to slide to the same plane as the clamping plate.

[0027] By adopting the above technical solution, when the driving airbag is inflated, the driving block drives the two sets of plates to slide in opposite directions, thereby achieving a wider range of clamping and compression of wounds or blood vessels. In addition, the control component arranged on the clamping plate can automatically adjust the plate to a position on the same plane as the clamping plate after the plate slides off the clamping plate, thereby ensuring the flatness of the hemostatic clip and the stability of the clamping effect.

[0028] Optionally, the control assembly includes a power sleeve and a power spring;

[0029] The power sleeve is slidably mounted on the outer peripheral side of the guide column, and the plate body is provided with a power block, which slides on the power sleeve in a direction perpendicular to the guide column;

[0030] The power spring is arranged on the power sleeve, and the power spring drives the plate body to slide until it is in the same plane as the clamping plate.

[0031] By adopting the above technical solution, the control component realizes the control of the sliding position of the expansion plate through the coordinated action of the power sleeve and the power spring.

[0032] Optionally, a limiting block is provided on a side wall of the power block, and the power sleeve is formed with a limiting groove for the limiting block to slide.

[0033] By adopting the above technical solution, a limiting block is arranged on the side wall of the power block, and a limiting groove for the limiting block to slide is formed on the power sleeve. This design further enhances the stability and reliability of the power block sliding in the power sleeve. The cooperation between the limiting block and the limiting groove limits the sliding track and range of the power block, reducing the problems of the power block shifting or falling off during the sliding process.

[0034] Optionally, a support column parallel to the clamping plate is slidably disposed on one side of the clamping plate away from the guide column, and a linkage block is disposed between the support column and the power sleeve;

[0035] When the plate body is in the same plane as the clamping plate, the plate body abuts against the support column.

[0036] By adopting the above technical solution, a support column parallel to the side of the clamping plate away from the guide column is slidably arranged, and a linkage block is arranged between the support column and the power sleeve. When the expansion plate slides to the same plane as the clamping plate, the support column is driven to slide away from the clamping plate through the action of the linkage block, so that the plate body can abut against the support column to support the plate body, thereby improving the stability of the wound clamping.

[0037] Optionally, a sliding block is provided on the side wall of the power sleeve, and a sliding groove is formed on the guide column for the sliding block to slide.

[0038] By adopting the above technical solution, a sliding block is arranged on the side wall of the power sleeve, and a sliding groove for the sliding block to slide is formed on the guide column. This design ensures stable sliding and precise positioning of the power sleeve on the guide column. The mutual cooperation between the sliding block and the sliding groove limits the sliding track and range of the power sleeve, reducing the problems of displacement or jamming of the power sleeve during sliding.

[0039] In summary, the present application includes at least one of the following beneficial effects:

[0040] 1. When the driving column rotates, the driving assembly causes the relatively arranged expansion plate to slide out of the clamping plate, thereby effectively clamping and compressing the wound or blood vessel, achieving the purpose of hemostasis, reducing the number of hemostatic clips used, and improving the efficiency of hemostasis;

[0041] 2. When the driving airbag is inflated, the driving block drives the two sets of plates to slide in opposite directions, thereby achieving a wider range of clamping and compression of wounds or blood vessels. In addition, the control component set on the clamping plate can automatically adjust the plate to the same plane as the clamping plate after the plate slides off the clamping plate, ensuring the flatness of the hemostatic clip and the stability of the clamping effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 is a schematic diagram of the external structure of an embodiment of the present application;

[0043] Figure 2 is a schematic diagram of an internal cross-section of an embodiment of the present application;

[0044] Figure 3 yes Figure 2 A magnified schematic diagram of part A;

[0045] Figure 4 yes Figure 2 A magnified schematic diagram of part B;

[0046] Figure 5 is a schematic diagram of the internal cross-section of a guide column in an embodiment of the present application;

[0047] Figure 6It is a schematic diagram of the connection structure between the plate body and the power sleeve in the embodiment of the present application.

[0048] Figure numerals: 1. clamping part; 2. clamping sleeve; 3. clamping plate; 31. guide column; 311. sliding groove; 32. mounting ring; 4. bending plate; 5. driving column; 51. linkage column; 6. expansion plate; 61. plate body; 611. power block; 7. driving block; 71. bearing column; 711. sliding groove; 72. driving airbag; 73. air storage airbag; 74. connecting pipe; 75. extrusion ring; 751. linkage groove; 752. connecting ring; 8. control assembly; 81. power sleeve; 811. sliding block; 82. power spring; 9. support column; 91. linkage block. DETAILED DESCRIPTION

[0049] The following is combined with Figure 1-6 This application is described in further detail.

[0050] The embodiment of the present application discloses a hemostatic clip.

[0051] See also Figure 1 and Figure 2 The hemostatic clamp includes a clamping part 1, which is the main working part of the hemostatic clamp and is used to directly clamp blood vessels or tissues. The clamping part 1 includes a clamping sleeve 2, two clamping plates 3, a bending plate 4 and a driving column 5. A connecting hole is formed in the middle of the clamping sleeve 2, and the bending plate 4 is in a "V"-shaped structure. The bending plate 4 slides at the opening position of the connecting hole, and the "V"-shaped opening side of the bending plate 4 is located outside the connecting hole. The bending plate 4 is made of stainless steel material with elastic deformation, and the two clamping plates 3 are symmetrical and respectively fixed on the two ends of the bending plate 4. When the bending plate 4 is bent, the bending plate 4 drives the two clamping plates 3 to approach each other to clamp and stop bleeding at the wound to be hemostatic; when the bending plate 4 is deformed and restored, the bending plate 4 drives the two clamping plates 3 to move away from each other to loosen the wound.

[0052] The driving column 5 passes through the connecting hole, and the driving column 5 is slidably connected to the clamping sleeve 2, and one end of the driving column 5 is rotatably connected to the tip of the "V" shape of the bending plate 4. When the driving column 5 slides on the clamping sleeve 2, it can drive the bending plate 4 to slide into the clamping sleeve 2 and push the bending plate 4 to slide out of the clamping sleeve 2. The hemostatic clamp also includes a clamp, which is detachably connected to the driving column 5. When in use, the clamping part 1 is extended to the wound to be hemostatic through the clamp, and then the driving column 5 is controlled by the clamp to slide on the clamping sleeve 2 in a direction close to or away from the clamp. When the driving column 5 approaches the clamp, the bending plate 4 slides into the clamping sleeve 2, driving the clamping plate 3 to clamp the wound; when the driving column 5 is away from the clamp, the bending plate 4 slides out of the clamping sleeve 2, driving the clamping plate 3 to loosen the wound. In the embodiment of the present application, the principle that the clamp controls the driving column 5 to slide on the clamping sleeve 2, and the clamp connects and releases the driving column 5 is prior art, so no further details will be given here.

[0053] See also Figure 2 and Figure 3 , the two clamping plates 3 are fixedly connected to the facing sides thereof with guide posts 31, and the extension direction of the guide posts 31 is perpendicular to the central axis of the driving post 5. At the same time, a group of expansion plates 6 are slidably arranged on the facing sides of the clamping plates 3, each group of expansion plates 6 has two expansion plates, and the expansion plates 6 slide on the guide posts 31. The expansion plates 6 are guided by the guide posts 31 arranged on the clamping plates 3, slide outwards of the clamping plates 3, expand the clamping plates 3, increase the clamping area of ​​the wound, and can control the expansion area of ​​the clamping plates 3 to adapt to the size of the wound, reduce the possibility of clamping normal blood and flesh, and affect the health of normal blood and flesh due to obstruction of blood flow.

[0054] The hemostatic clip also includes a driving assembly, which is responsible for driving the two expansion plates 6 in the same group to slide in opposite directions, and the driving assembly is connected between the clamping sleeve 2 and the clamping plate 3. When the driving column 5 rotates, the driving assembly can drive the two expansion plates 6 in the same group to slide out of the clamping plate 3 to expand the clamping area.

[0055] See also Figure 4 and Figure 5 Specifically, the driving assembly includes a bearing column 71, a driving airbag 72, an air storage airbag 73, a connecting pipe 74, a driving block 7 and an extrusion ring 75. The bearing column 71 is fixedly connected to the clamping sleeve 2 and is located in the connecting hole. The driving column 5 is axially slidably penetrated through the bearing column 71 along the clamping sleeve 2. The bearing column 71 forms a mounting groove with an annular structure. The air storage airbag 73 is installed on the bearing column 71 and is located in the mounting groove. The air storage airbag 73 is an annular structure for storing gas. The air storage airbag 73 is made of elastically deformable rubber or silicone material. The driving airbag 72 is installed in the guide column 31. The driving airbag 72 is made of elastically deformable rubber or silicone material. There are two driving airbags 72 and they correspond one-to-one to the two expansion plates 6 in the same group.

[0056] The connecting tube 74 is passed through the bearing column 71 and the guide column 31, and the connecting tube 74 corresponds to the driving airbag 72 one by one. One end of the connecting tube 74 is connected and fixed to the driving airbag 72, and the other end is connected and fixed to the air storage airbag 73. When in use, the connecting tube 74 is used to connect the driving airbag 72 and the air storage airbag 73, so that the gas between the two can flow freely.

[0057] See also Figure 5 and Figure 6 The driving block 7 slides on the guide column 31, and the driving block 7 corresponds to and is fixedly connected with the driving airbag 72. When the driving airbag 72 expands, the driving block 7 drives the expansion plate 6 to slide outward of the clamping plate 3.

[0058] See also Figure 4A slide groove 711 of an annular structure is formed on the side of the bearing column 71 away from the connecting tube 74, and the slide groove 711 is connected to the installation groove. The extrusion ring 75 is slidably installed in the slide groove 711, and the outer peripheral side wall of the extrusion ring 75 is threadedly connected to the peripheral groove wall of the slide groove 711. The connecting ring 752 is rotatably connected to the side of the connecting ring 752 close to the air storage airbag 73, and the connecting ring 752 is fixedly connected to the side of the air storage airbag 73 away from the connecting tube 74. The driving column 5 slides through the connecting ring 752 and the extrusion ring 75, and the outer peripheral side of the driving column 5 is fixedly connected to the linkage column 51, and the linkage column 51 is parallel to the driving column 5. A linkage groove 751 is formed along the axial direction on the inner wall of the peripheral side of the extrusion ring 75, and the linkage column 51 is slidably connected to the linkage groove 751, and the length of the linkage column 51 is greater than the length of the linkage groove 751.

[0059] join Figure 4 and Figure 5 When in use, the driving column 5 can slide in the extrusion ring 75 along the axial direction, and the linkage column 51 slides in the linkage groove 751; and the driving column 5 can rotate, and the side wall of the linkage column 51 abuts against the groove wall of the linkage groove 751, driving the extrusion ring 75 to rotate, and the extrusion ring 75 moves toward the bending plate 4 to squeeze the air storage bag 73. When the air storage bag 73 is squeezed, the airflow flows into the driving bag 72 through the connecting pipe 74, and the driving bag 72 expands, and drives the expansion board 6 to slide through the driving block 7, and the two expansion boards 6 in the same group slide in opposite directions.

[0060] See also Figure 1 At the same time, in order to enable the expansion plate 6 and the clamping plate 3 to better clamp the flesh and blood at the wound to be hemostatic, each expansion plate 6 includes a plurality of plate bodies 61, and the plate bodies 61 in the same group are evenly arranged.

[0061] See also Figure 6 In addition, a control assembly 8 is also provided on the clamping plate 3, which is used to control the plate body 61 to slide to the same plane as the clamping plate 3 when the plate body 61 slides away from the clamping plate 3. Such a control assembly 8 can ensure that the expansion plate 6 can remain flush with the clamping plate 3 after sliding out, thereby improving the stability and reliability of clamping.

[0062] The control assembly 8 includes a power sleeve 81 and a power spring 82 . The cross section of the power sleeve 81 is a “C”-shaped structure. There are two power sleeves 81 and they correspond one to one with the expansion plates 6 .

[0063] See also Figure 3 and Figure 5The power sleeve 81 slides on the guide column 31, the inner wall of the peripheral side of the power sleeve 81 slides in contact with the outer wall of the guide column 31, and the driving block 7 is connected and fixed to the power sleeve 81. The inner wall of the power sleeve 81 is fixedly connected with a sliding block 811, and the outer wall of the guide column 31 is formed with a sliding groove 311. The sliding block 811 is slidably connected to the sliding groove 311, limiting the power sleeve 81 from detaching from the guide column 31 in the direction away from the clamping plate 3.

[0064] See also Figure 6 The plate body 61 is slidably connected to the side wall of the power sleeve 81, and the adjacent plate bodies 61 in the same group are in sliding contact. The plate body 61 is fixedly connected to the power block 611, and the outer wall of the power sleeve 81 is formed with a power groove, the extension direction of the power groove is perpendicular to the guide column 31, and the power block 611 slides in the power groove. The side wall of the power block 611 is fixedly connected to a limiting block, and the power groove wall is connected to form a limiting groove, and the limiting block slides in the limiting groove.

[0065] The power spring 82 is installed on the power sleeve 81 and is located in the power groove. The power spring 82 corresponds to the plate body 61. One end of the power spring 82 abuts against the power block 611, and the other end abuts against the wall of the power groove. When the plate body 61 slides away from the clamping plate 3, the power spring 82 is elastically released, driving the plate body 61 to slide to the same plane as the clamping plate 3. At this time, the plate body 61 and the clamping plate 3 cooperate with each other to neatly clamp the flesh at the wound.

[0066] At the same time, in order to improve the stability of the plate body 61, a mounting ring 32 is fixedly connected to the side of the clamping plate 3 away from the guide column 31. There are two groups of mounting rings 32 that are staggered with each other. Each group of mounting rings 32 has multiple mounting rings and is evenly spaced along the length direction parallel to the guide column 31. Each clamping plate 3 is slidably connected to two mutually parallel and staggered support columns 9. Each support column 9 corresponds to a group of mounting rings 32, and the support column 9 is slidably inserted into the mounting ring 32. The support column 9 is parallel to the guide column 31. A linkage block 91 is fixedly connected between the support column 9 and the power sleeve 81. When the power sleeve 81 slides, it drives the support column 9 to slide out of the clamping plate 3. When the plate body 61 and the clamping plate 3 are in the same plane, the plate body 61 abuts against the support column 9. At this time, the support column 9 supports the plate body 61 to improve the stability of the wound clamping.

[0067] The implementation principle of a hemostatic clip in the embodiment of the present application is:

[0068] When in use, extend the head of the knife to the middle position of the wound to be hemostatic, and then control the driving column 5 to drive the bending plate 4 to slide out of the clamping sleeve 2, so that the two clamping plates 3 are away from each other; then, after the clamping plates 3 are moved to both sides of the wound, control the driving column 5 to rotate, so that the plate body 61 slides out of the clamping plate 3, and the clamping area of ​​the clamping plate 3 is expanded, and the expanded area is determined according to the size of the wound; finally, control the driving column 5 to make the bending plate 4 slide into the clamping sleeve 2, drive the clamping plate 3 and the plate body 61 to clamp the flesh and blood at the wound, without using multiple hemostatic clamps, greatly improving the hemostasis speed, and when the clamping plates 3 and the plate body 61 clamp the flesh and blood for hemostasis, they can reduce the area of ​​clamping healthy flesh and blood, thereby reducing the possibility of affecting healthy flesh and blood due to blood flow obstruction caused by clamping.

[0069] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A hemostatic clip, characterized in that: include The clamping part (1) comprises a clamping sleeve (2), a clamping plate (3), a bending plate (4) and a driving column (5); The bending plate (4) is arranged on the clamping sleeve (2), and the clamping plates (3) are symmetrically arranged and respectively connected to two ends of the bending plate (4); The driving column (5) is slidably disposed in the clamping sleeve (2), and the driving column (5) is rotatably connected to the bending plate (4); An expansion plate (6) is slidably arranged on the opposite sides of the clamping plate (3), and the clamping plate (3) is provided with a guide column (31), wherein the guide column (31) guides the expansion plate (6) to slide toward the outside of the clamping plate (3); A driving assembly connected to the clamping sleeve (2) and the clamping plate (3), wherein when the driving column (5) rotates, the driving assembly drives the expansion plate (6) to slide out of the clamping plate (3); The driving assembly comprises a bearing column (71), a driving airbag (72), an air storage airbag (73), a connecting pipe (74), a driving block (7) and an extrusion ring (75); The bearing column (71) is arranged in the clamping sleeve (2), and the driving column (5) slides on the bearing column (71); The air storage airbag (73) is arranged in the bearing column (71), the driving airbag (72) is arranged in the guide column (31), the driving block (7) slides on the guide column (31), and when the driving airbag (72) is expanded, the driving block (7) drives the expansion plate (6) to slide; The connecting pipe (74) connects the driving airbag (72) and the air storage airbag (73); A sliding groove (711) for the extrusion ring (75) to slide up and down is formed on the side of the bearing column (71) away from the bending plate (4); the extrusion ring (75) is threadedly connected to the peripheral groove wall of the sliding groove (711); and the side of the air storage bag (73) away from the bending plate (4) is connected to the extrusion ring (75); The driving column (5) slides on the extrusion ring (75), and a linkage column (51) is provided on the outer peripheral side of the driving column (5), and the linkage column (51) slides up and down on the extrusion ring (75).

2. A hemostatic clip according to claim 1, characterized in that: A connecting ring (752) is rotatably connected to a side of the extrusion ring (75) close to the air storage bag (73), and the connecting ring (752) is connected to the air storage bag (73).

3. A hemostatic clip according to claim 1, characterized in that: The expansion plate (6) comprises two groups of plate bodies (61), the driving airbags (72) are symmetrically arranged, and the driving blocks (7) correspond one to one with the driving airbags (72); Each group of the plates (61) has a plurality of plates (61) arranged at intervals, and the adjacent plates (61) in the same group are arranged to slide relative to each other; The driving block (7) drives the two groups of plates (61) to slide in opposite directions; The clamping plate (3) is provided with a control component (8), and when the plate body (61) slides away from the clamping plate (3), the control component (8) controls the plate body (61) to slide to the same plane as the clamping plate (3).

4. A hemostatic clip according to claim 3, characterized in that: The control assembly (8) comprises a power sleeve (81) and a power spring (82); The power sleeve (81) is slidably sleeved on the outer peripheral side of the guide column (31); the plate body (61) is provided with a power block (611); the power block (611) slides on the power sleeve (81) in a direction perpendicular to the guide column (31); The power spring (82) is arranged on the power sleeve (81), and the power spring (82) drives the plate body (61) to slide until it is in the same plane as the clamping plate (3).

5. A hemostatic clip according to claim 4, characterized in that: A limiting block is provided on the side wall of the power block (611), and a limiting groove is formed on the power sleeve (81) for the limiting block to slide.

6. A hemostatic clip according to claim 4, characterized in that: A support column (9) is slidably disposed parallel to the clamping plate (3) on a side away from the guide column (31), and a linkage block (91) is disposed between the support column (9) and the power sleeve (81); When the plate body (61) is in the same plane as the clamping plate (3), the plate body (61) abuts against the support column (9).

7. A hemostatic clip according to claim 4, characterized in that: The side wall of the power sleeve (81) is provided with a sliding block (811), and the guide column (31) is formed with a sliding groove (311) for the sliding block (811) to slide.

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