A vascular occlusion device

Abstract

The application relates to a blood vessel blocking device and belongs to the technical field of medical instruments, which solves the problem that the metal blood vessel blocking forceps in the prior art cannot be bent, blocks the surgical visual field and influences the surgical operation. The application comprises a blocking belt and a locking mechanism, the blocking belt can be connected with the locking mechanism, the blocking belt is used for winding the blood vessel of a patient, and the locking mechanism is used for tightening the blocking belt so as to block the blood flow in the blood vessel. According to the surgical requirement, the medical staff can bend the blocking belt of the application to an arbitrary direction, the blocking belt does not block the operation area and does not influence the surgical operation; the blocking belt is an elastic blocking belt, can be stretched and rebounded in the length direction and can be tightened to the blood vessel.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a blood vessel blocking device. Background Technology

[0002] In vascular surgery, after fully exposing the blood vessels, temporary occlusion is necessary to control bleeding, maintain a clear surgical field, reduce surgical time, decrease postoperative complications, improve surgical precision, reduce the risk of cardiovascular events, and protect distal tissues.

[0003] In vascular surgery, vascular occlusion often needs to be performed quickly and easily, while also being able to be effectively controlled and released quickly. The occlusion device must meet requirements such as being free from iatrogenic trauma to the blood vessel.

[0004] Currently, the primary vascular occlusion device used clinically is the vascular occlusion forceps, which achieve vascular occlusion by clamping the vessel with metal forceps. While using the forceps, vascular slings are also needed at the proximal and distal ends of the vessel to effectively control it. Commonly used vascular occlusion forceps are relatively large (arms longer than 10cm) and are of a metal mechanical structure, making it impossible to freely change shape according to the surgical area and the vessel's course. Furthermore, after occlusion, the forceps remain within the surgical area, often affecting further surgical procedures and interfering with delicate vascular surgeries, especially in confined spaces (such as small incisions). Summary of the Invention

[0005] To address the aforementioned shortcomings of the prior art, the present invention provides a vascular occlusion device to solve the problem that metal vascular occlusion forceps in the prior art cannot be bent, thus obstructing the surgical field and affecting surgical operations.

[0006] To achieve the above-mentioned objectives, the technical solution adopted by this invention is as follows:

[0007] The present invention provides a blood vessel blocking device, including a blocking band and a locking mechanism. The blocking band can be connected to the locking mechanism. The blocking band is used to wrap around a patient's blood vessel, and the locking mechanism is used to tighten the blocking band so that the blocking band blocks the blood flow in the blood vessel.

[0008] Furthermore, the blocking band is a soft blocking band.

[0009] Furthermore, the blocking band is an elastic blocking band that can stretch and rebound in the length direction, thereby tightening the blood vessel.

[0010] Furthermore, the locking mechanism includes a snap-fit ​​unit and a snap-fit ​​hole, both of which are disposed on the blocking band. The snap-fit ​​unit can be inserted into the snap-fit ​​hole to block the blood vessel.

[0011] Furthermore, the snap-fit ​​unit includes a snap-fit ​​post disposed at the end of the blocking band. When the blocking band is bent, the snap-fit ​​post can be inserted into the snap hole, thereby forming an elastic blocking loop at one end of the blocking band. The blocking loop is used to encircle and block the blood vessel.

[0012] Furthermore, the snap-fit ​​unit also includes a blocking block disposed at the end of the snap-fit ​​post; the outer diameter of the blocking block is larger than the inner diameter of the snap-fit ​​hole, and it can prevent the snap-fit ​​post from disengaging from the snap-fit ​​hole.

[0013] Furthermore, multiple locking holes are provided and are continuously arranged along the length of the blocking strip; different locking holes can be connected to the locking post to form blocking rings with different inner diameters.

[0014] Furthermore, the locking mechanism includes a second locking block and a first clamping plate, the first clamping plate being disposed on the second locking block, and one end face of the first clamping plate and the second locking block forming a first clamp.

[0015] Furthermore, the locking mechanism also includes a second clamping plate, and the other end face of the second clamping plate and the second locking block constitutes a second clamp.

[0016] Furthermore, the second locking block includes a second body; the first clamping plate includes a plate body, one end of which is connected to the second body, and the other end of which is a free end; the first clamping clamp can clamp the blocking strip.

[0017] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0018] (1) The blocking strip of the blocking device of the present invention is a soft blocking strip; during the operation, the blocking strip can be bent. According to the needs of the operation, the medical staff can bend the blocking strip in any direction. The blocking strip will not block the operation area and will not affect the operation; the blocking strip is an elastic blocking strip that can be stretched and rebounded in the length direction and can tighten the blood vessels.

[0019] (2) The present invention has multiple card holes, which are continuously arranged along the length of the blocking band. Different card holes can be connected to the carding post to form blocking loops with different inner diameters, so that the blocking device of this embodiment can be applied to blood vessels of different diameters.

[0020] (3) The blocking band of the blocking device of the present invention can be infinitely adjusted and tightened to the blood vessel. Pulling the free end of the band body tightens the locking band sleeve. The band body is connected to the blocking band and the blocking band is locked. The protrusion is connected to the slot, which can prevent the inner diameter of the locking band sleeve from increasing, thereby preventing the inner diameter of the blocking ring from changing and maintaining the blocking of the blood vessel.

[0021] (4) In the blocking device of the present invention, one end face of the first clamping plate and the second locking block constitutes the first clamp, and the other end face of the second clamping plate and the second locking block constitutes the second clamp. The first clamp and the second clamp are respectively connected to the two ends of the blocking band, thereby locking the blocking band and preventing the inner diameter of the locking band sleeve from increasing, thus maintaining the blocking of the blood vessel. Medical staff only need to pinch the second locking block with one hand and pull the blocking band with the other hand to block the blood vessel. The operation is simple and the operation time is shortened.

[0022] (5) The transmission unit of the present invention can drive the rotating wheel and drive the blocking belt to move within the first clamp, thereby changing the inner diameter of the locking belt sleeve and tightening or loosening the patient's blood vessels; when blocking blood vessels, medical staff can perform the blocking operation outside the patient's body without touching the patient's blood vessels, reducing the risk of damaging blood vessels.

[0023] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages may become apparent from the specification or be learned by practicing the invention. The objectives and other advantages of this invention can be realized and obtained from the content specifically pointed out in the text and drawings. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the blocking device in Example 1;

[0025] Figure 2 This is a schematic diagram of the overall structure of the blocking device in Example 2;

[0026] Figure 3 This is a schematic cross-sectional view of the blocking device in Example 2;

[0027] Figure 4 This is a schematic diagram of the overall structure of the blocking device in Example 3;

[0028] Figure 5 This is a schematic diagram of the overall structure of the locking mechanism in Example 3;

[0029] Figure 6 This is a schematic diagram of the overall structure of the locking mechanism in Example 4;

[0030] Figure 7 This is an exploded structural diagram of the locking mechanism in Example 4.

[0031] Figure label:

[0032] 1-Blocking strip; 2-Snap-fit ​​unit; 3-Snap-fit ​​hole; 4-First locking block; 5-Locking strip; 6-Second locking block; 7-First locking plate; 8-Second locking plate; 9-Transmission unit; 21-Snap-fit ​​post; 22-Blocking block; 41-First main body; 42-Protrusion; 51-Belt body; 52-Slot; 61-Second main body; 62-Anti-slip teeth; 63-Card slot; 64-Rotating wheel; 65-Hook; 66-Plug-in block; 71-Plate body; 72-Plate anti-slip teeth; 73-Plate locking block; 91-Cover; 92-Drive gear; 93-Drive rack; 94-Rack spring; 95-Sheath; 96-Push rod; 97-Ratchet plate; 98-Locking leaf spring. Detailed Implementation

[0033] The specific embodiments of the present invention are described below to enable those skilled in the art to understand the present invention. However, it should be understood that the present invention is not limited to the scope of the specific embodiments. For those skilled in the art, various changes are obvious as long as they are within the spirit and scope of the present invention as defined and determined by the appended claims. All inventions utilizing the concept of the present invention are protected.

[0034] Example 1:

[0035] A specific embodiment of the present invention, such as Figure 1 As shown, a vascular occlusion device (hereinafter referred to as the occlusion device) includes an occlusion band 1 and a locking mechanism, wherein the occlusion band 1 can be connected to the locking mechanism. The occlusion band 1 is used to wrap around the patient's blood vessels, and the locking mechanism is used to tighten the occlusion band 1, thereby blocking the blood flow in the blood vessels.

[0036] Preferably, the blocking band 1 is a soft blocking band. During the operation, the blocking band 1 can be bent. As needed for the operation, medical staff can bend the blocking band 1 in any direction without obstructing the operating area or affecting the operation.

[0037] Preferred, such as Figure 1 As shown, the locking mechanism of this embodiment includes a locking unit 2 and a locking hole 3. Both the locking unit 2 and the locking hole 3 are disposed on the blocking band 1. The locking unit 2 can be inserted into the locking hole 3 to block the blood vessel.

[0038] Preferably, the blocking band 1 is an elastic blocking band that can stretch and rebound in the length direction, thereby tightening the blood vessel.

[0039] Preferably, the locking unit 2 includes a locking post 21 and a blocking block 22. The locking post 21 is disposed at the end of the blocking band 1, and the blocking block 22 is disposed at the end of the locking post 21. When the blocking band 1 is bent, the locking post 21 can be inserted into the locking hole 3, thereby forming an elastic blocking loop at one end of the blocking band 1. The blocking loop is used to encircle and block the blood vessel. The outer diameter of the blocking block 22 is larger than the inner diameter of the locking hole 3, and it can prevent the locking post 21 from disengaging from the locking hole 3.

[0040] Preferably, multiple locking holes 3 are provided and are continuously arranged along the length of the blocking band 1. Different locking holes 3 can be connected to the locking post 21 to form blocking loops with different inner diameters, thereby enabling the blocking device of this embodiment to be applicable to blood vessels of different diameters.

[0041] Compared to existing technologies, the blocking band 1 of the blocking device in this embodiment is a soft blocking band. During surgery, the blocking band 1 can be bent. As needed, medical staff can bend the blocking band 1 in any direction without obstructing the operating area or affecting the surgical procedure. The blocking band 1 is an elastic blocking band that can stretch and rebound along its length, effectively ligating blood vessels. Multiple locking holes 3 are provided and continuously arranged along the length of the blocking band 1. Different locking holes 3 can be connected to the locking post 21 to form blocking loops with different inner diameters, thus enabling the blocking device of this embodiment to be applicable to blood vessels of different diameters.

[0042] Example 2:

[0043] In Example 1, the distance of the locking hole 3 is fixed, and the inner diameter of the blocking loop cannot be adjusted steplessly. Therefore, as... Figure 2 As shown, based on Embodiment 1, Embodiment 2 improves the locking mechanism of Embodiment 1 by removing the snap-fit ​​unit 2 and the snap-fit ​​hole 3, and adding a first locking block 4 and a locking band 5. The connecting end of the locking band 5 is connected to the first locking block 4, and the other end of the locking band 5 is a free end that can pass through the first locking block 4 and wrap around the blocking band 1. The blocking band 1 can be infinitely adjusted and tightened to occlude the blood vessel. The locking mechanism of this embodiment is used to lock the blocking band 1 to prevent changes in the inner diameter of the blocking loop and maintain the occlusion of the blood vessel.

[0044] Preferred, such as Figure 3 As shown, the first locking block 4 includes a first body 41, a locking band groove, and a protrusion 42. The locking band groove is disposed on the first body 41, and the protrusion 42 is disposed on the locking band groove. The locking band 5 can pass through the locking band groove and form a locking band sleeve with the first body 41. The locking band sleeve is used to lock the blocking band 1. The protrusion 42 is used to connect with the locking band 5 to prevent the inner diameter of the locking band sleeve from increasing.

[0045] Preferably, the locking band 5 includes a band body 51 and slots 52. The connecting end of the band body 51 is connected to the first locking block 4, and the other end of the band body 51 is a free end. Multiple slots 52 are provided and arranged on the band body 51 along its length. The protrusions 42 can connect with the slots 52 and prevent the band body 51 from moving towards the blocking band 1, thus preventing the inner diameter of the locking band sleeve from increasing.

[0046] Medical staff pass the free end of the band body 51 through the locking band groove, and the band body 51 and the first body 41 form a locking band sleeve. The two ends of the blocking band 1 wrapped around the blood vessel are passed through the locking band sleeve and pulled away from the blood vessel. The blocking band 1 blocks the blood vessel. Pulling the free end of the band body 51 tightens the locking band sleeve. The band body 51 is connected to the blocking band 1 and the blocking band 1 is locked. The protrusion 42 is connected to the slot 52 to prevent the inner diameter of the locking band sleeve from increasing, thereby preventing the inner diameter of the blocking loop from changing and maintaining the blockage of the blood vessel.

[0047] Compared to Embodiment 1, the blocking device of this embodiment can steplessly adjust and tighten the blood vessel by pulling the free end of the band body 51 and tightening the locking sleeve. The band body 51 is connected to the blocking band 1 and the blocking band 1 is locked. The protrusion 42 is connected to the slot 52, which can prevent the inner diameter of the locking sleeve from increasing, thereby preventing the inner diameter of the blocking loop from changing and maintaining the blockage of the blood vessel.

[0048] Example 3:

[0049] When using the blocking device of Embodiment 2 to block a blood vessel, one medical worker needs to pull the blocking band 1 with one hand, while another medical worker needs to pinch the first locking block 4 with one hand and pull the locking band 5 with the other hand to block the blood vessel. Therefore, as Figure 4 As shown, Embodiment 3 improves upon the locking mechanism of Embodiment 2 by removing the first locking block 4 and the locking band 5, and adding a second locking block 6, a first clamping plate 7, and a second clamping plate 8. The first clamping plate 7 and the second clamping plate 8 are respectively positioned at both ends of the second locking block 6. One end face of the first clamping plate 7 and the second locking block 6 forms a first clamp, and the other end face of the second clamping plate 8 and the second locking block 6 forms a second clamp. The first clamp and the second clamp are respectively used to connect to both ends of the blocking band 1, thereby locking the blocking band 1 and preventing the inner diameter of the locking band sleeve from increasing, thus maintaining the blockage of the blood vessel. Medical personnel only need to pinch the second locking block 6 with one hand and pull the blocking band 1 with the other hand to perform the blood vessel blockage operation. The first clamping plate 7 and the second clamping plate 8 have the same structure, as do the first clamp and the second clamp.

[0050] Preferred, such as Figure 5As shown, the second locking block 6 includes a second body 61. The first clamping plate 7 includes a plate body 71, which is a C-shaped clamping plate. One end of the plate body 71 is connected to the second body 61, and the other end of the plate body 71 is a free end. The distance between the inner wall of the plate body 71 and the second body 61 is less than the outer diameter of the blocking band 1, and the first clamp can clamp the blocking band 1.

[0051] Preferably, to enhance the anti-slip performance of the locking mechanism in this embodiment, the second locking block 6 further includes anti-slip teeth 62, which are disposed on the end faces of the second block body 61 opposite to the first clamping plate 7 and the second clamping plate 8. The first clamping plate 7 also includes plate anti-slip teeth 72, which are disposed on the plate body 71. Both the block anti-slip teeth 62 and the plate anti-slip teeth 72 can connect with the outer wall of the blocking strip 1, increasing the contact area between the first clamp and the blocking strip 1 and enhancing the anti-slip performance of the locking mechanism in this embodiment.

[0052] Preferably, to further tighten the blocking band 1, the second locking block 6 also includes a locking plate groove 63, which is disposed on the outer wall of the second body 61. The first locking plate 7 also includes a locking block 73, which is disposed on the free end of the plate body 71. When the plate body 71 is pressed towards the second body 61, the locking block 73 can connect with the locking plate groove 63, the distance between the plate body 71 and the second body 61 decreases, and the first clamp further tightens the blocking band 1.

[0053] Compared to Embodiment 2, in this embodiment, one end face of the first clamping plate 7 and the second locking block 6 of the blocking device constitutes a first clamp, and the other end face of the second clamping plate 8 and the second locking block 6 constitutes a second clamp. The first clamp and the second clamp are respectively connected to both ends of the blocking band 1, thereby locking the blocking band 1, preventing the inner diameter of the locking band sleeve from increasing, and maintaining the blockage of the blood vessel. Medical personnel only need to pinch the second locking block 6 with one hand and pull the blocking band 1 with the other hand to perform the blood vessel blocking operation, which is simple to operate and shortens the operation time.

[0054] Example 4:

[0055] The blocking devices in Examples 1-3 all require medical personnel to touch the patient's blood vessel when blocking it, posing a risk of accidental contact and damage to the vessel. Therefore, as... Figure 6As shown, based on Embodiment 3, Embodiment 4 adds a transmission unit 9 and improves the second locking block 6 of Embodiment 3 by removing the anti-slip teeth 62 on the end face opposite to the first clamping plate 7 and adding a rotating wheel 64. The transmission unit 9 can drive the rotating wheel 64 and also prevent the rotating wheel 64 from rotating. The rolling surface of the rotating wheel 64 can connect with the outer wall of the blocking band 1. The rotating wheel 64 can rotate and drive the blocking band 1 to move within the first clamp, thereby changing the inner diameter of the locking band sleeve and tightening or loosening the patient's blood vessels. When blocking blood vessels, medical personnel can perform the blocking operation outside the patient's body without contacting the patient's blood vessels, reducing the risk of damaging blood vessels.

[0056] Preferably, the rotating wheel 64 is disposed on the second body 61. The second body 61 includes a rotating wheel groove, and the rotating wheel 64 is rotatably connected to the rotating wheel groove.

[0057] Preferably, the rotating wheel 64 is a gear, and the teeth of the rotating wheel 64 increase the friction with the outer wall of the blocking belt 1 to prevent the blocking belt 1 from slipping with the rotating wheel 64.

[0058] Preferred, such as Figure 6 and Figure 7 As shown, the transmission unit 9 is a detachable transmission unit. The transmission unit 9, as a whole, can be connected to or detached from the second body 61. The second locking block 6 also includes a hook 65, one end of which is connected to the second body 61, and the other end of which is a hook. The transmission unit 9 can be connected to the hook 65, which prevents the transmission unit 9 from detaching from the second body 61. After the transmission unit 9 is detached from the second body 61, the rotating wheel 64 can rotate freely, and the blocking band 1 can release the blockage of the blood vessel, simplifying the operation and saving surgical time.

[0059] Preferably, the transmission unit 9 includes a housing 91, a drive gear 92, and a drive rack 93. The drive gear 92 is rotatably connected to the housing 91, and the drive rack 93 is disposed on the housing 91 and can slide on the housing 91. The housing 91 can be connected to a latch 65, which prevents the housing 91 from detaching from the second body 61. The drive rack 93 can mesh with the drive gear 92 and cause the drive gear 92 to rotate in the forward direction.

[0060] Preferably, in order to achieve a quick connection between the transmission unit 9 and the rotating wheel 64, the second locking block 6 further includes a plug-in block 66, which is connected to the end of the rotating wheel 64. The drive gear 92 is provided with a plug-in block slot, and the plug-in block 66 can be inserted into the plug-in block slot, thereby quickly connecting the rotating wheel 64 and the drive gear 92, and the drive gear 92 can drive the rotating wheel 64 to rotate in the forward direction.

[0061] Preferably, the transmission unit 9 further includes a rack spring 94, one end of which is connected to the drive rack 93, and the other end of which is connected to the inner wall of the cover 91. After the drive rack 93 slides and drives the drive gear 92 to rotate, the rack spring 94 is used to push the drive rack 93 back to its original position.

[0062] Preferably, in order to drive the drive rack 93, the transmission unit 9 also includes an actuating component for pushing or pulling the drive rack 93. The actuating component can be connected to or detached from the housing 91. During vascular occlusion, connecting the actuating component to the housing 91 allows the drive rack 93 to be pushed and pulled outside the patient's body, preventing damage to the blood vessel; after vascular occlusion, the actuating component can be detached from the housing 91 to avoid hindering the procedure.

[0063] Preferably, the actuation component includes a sheath 95 and a push rod 96. The sheath 95 can be connected to the housing 91, and the push rod 96 is disposed within the sheath 95. The push rod 96 can be connected to the drive rack 93, such as by a threaded connection, and pushes or pulls the drive rack 93. The sheath 95 can be connected to the housing 91 and serves to protect the push rod 96, preventing it from injuring the patient's body due to pushing or pulling movements.

[0064] Preferably, to prevent the rotating wheel 64 from rotating in the opposite direction and causing the blocking belt 1 to loosen, the transmission unit 9 further includes a ratchet plate 97 and a locking leaf spring 98. One end of the ratchet plate 97 is rotatably connected to the cover 91, and the other end of the ratchet plate 97 is provided with ratchet teeth that can mesh with the drive gear 92 and prevent the drive gear 92 from rotating in the opposite direction. One end of the locking leaf spring 98 is connected to the ratchet plate 97, and the other end of the locking leaf spring 98 is connected to the cover 91. The locking leaf spring 98 is used to push the ratchet plate 97 to keep the ratchet plate 97 engaged with the drive gear 92.

[0065] Compared to Embodiment 3, in this embodiment, the transmission unit 9 can drive the rotating wheel 64 and move the blocking band 1 within the first clamp, thereby changing the inner diameter of the locking sleeve and tightening or loosening the patient's blood vessels. When blocking blood vessels, medical personnel can perform the blocking operation outside the patient's body without contacting the blood vessels, reducing the risk of damaging the blood vessels. The transmission unit 9 can be connected to the hook 65, which prevents the transmission unit 9 from detaching from the second body 61. After the transmission unit 9 detaches from the second body 61, the rotating wheel 64 can rotate freely, and the blocking band 1 can release the blockage of the blood vessels, simplifying the operation and saving surgical time. The actuating component can be connected to the cover 91 or detached from the cover 91. During the blood vessel blocking operation, connecting the actuating component to the cover 91 allows for pushing and pulling the rack 93 outside the patient's body, preventing damage to the blood vessels. After the blood vessel is blocked, the actuating component can be detached from the cover 91 to avoid hindering the surgery.

[0066] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A blood vessel blocking device, characterized in that, It includes a blocking band (1), a locking mechanism and a transmission unit (9). The blocking band (1) can be connected to the locking mechanism. The blocking band (1) is used to wrap around the patient's blood vessels. The locking mechanism is used to tighten the blocking band (1) so that the blocking band (1) blocks the blood flow in the blood vessels. The locking mechanism includes a second locking block (6) and a first clamping plate (7). The first clamping plate (7) is disposed on the second locking block (6), and one end face of the first clamping plate (7) and the second locking block (6) constitutes a first clamp. The locking mechanism also includes a second clamping plate (8), and the other end face of the second clamping plate (8) and the second locking block (6) constitutes a second clamp. The second locking block (6) includes a second body (61), a rotating wheel (64), a hook (65), and a plug-in block (66). The rotating wheel (64) is disposed on the second body (61), and the rotating wheel (64) is rotatably connected to the rotating wheel groove of the second body (61). One end of the hook (65) is connected to the second body (61), and the other end of the hook (65) is a hook. The transmission unit (9) includes a housing (91), a drive gear (92), and a drive rack (93). The drive gear (92) is rotatably connected to the housing (91), and the drive rack (93) is mounted on the housing (91) and can slide on the housing (91). The housing (91) can be connected to a hook (65), which prevents the housing (91) from detaching from the second body (61). The drive rack (93) can mesh with the drive gear (92) and make the drive gear (92) rotate in the forward direction. The plug block (66) is connected to the end of the rotating wheel (64). The plug block (66) can be inserted into the plug block slot of the drive gear (92), thereby quickly connecting the rotating wheel (64) and the drive gear (92). The drive gear (92) can drive the rotating wheel (64) to rotate in the forward direction. The transmission unit (9) is a detachable transmission unit; after the transmission unit (9) is separated from the second body (61), the wheel (64) can rotate freely, and the blocking band (1) can release the blockage of the blood vessel.

2. The blood vessel blocking device according to claim 1, characterized in that, The blocking band (1) is a soft blocking band.

3. The blood vessel blocking device according to claim 1, characterized in that, The blocking band (1) is an elastic blocking band that can stretch and rebound in the length direction, thereby tightening the blood vessels.

4. The blood vessel blocking device according to claim 1, characterized in that, The first clamp (7) includes a plate body (71), one end of which is connected to the second plate body (61), and the other end of which is a free end. The first clamp can clamp the blocking strip (1).

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