Vascular anastomosis device for rapid liver transplantation with magnetic assistance

Abstract

The invention belongs to the technical field of medical auxiliary instruments, and discloses blood vessel anastomosis equipment for rapid liver transplantation by magnetic assistance, the blood vessel anastomosis equipment comprises two long rods, the bottom ends of the two long rods are fixedly provided with round tubes respectively, and the outer surfaces of the round tubes are sleeved with first handles in a threaded mode. Through arrangement of a first handle, a pressing block, an extension plate, an auxiliary plate and a magnet, when the first handle is rotated, the first handle drives one end of an inclined rod to move through a built-in ring, so that the inclined rod generates thrust on a cross rod, and the cross rod is pushed to drive a vertical rod and the pressing block to move to be separated from the extension plate; at the moment, a blood vessel can penetrate through the circular tube and be turned outwards to the outer surface of the auxiliary plate, and due to the fact that the magnetic poles of the two magnets are opposite, the blood vessel located in the circular tube can be matched together under the action of the magnets, so that blood vessel matching of rapid liver transplantation can be carried out through magnetism assistance, the operation time is shortened, and the operation risk is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical auxiliary devices, and specifically relates to a vascular anastomosis device for rapid liver transplantation using magnetic assistance. Background Art

[0002] Liver transplantation is an effective means for treating end-stage liver diseases. Through surgical operation, the diseased liver that has lost its function in the patient is removed, and then a viable and healthy liver is implanted to save the life of the endangered patient. According to the relationship between the donor and the recipient, liver transplantation can be divided into allogeneic liver transplantation, syngeneic liver transplantation, and xenogeneic liver transplantation.

[0003] Vascular anastomosis in liver transplantation, especially in pediatric liver transplantation, requires high technical content. During traditional liver transplantation surgery, the surgeon needs to wear magnifying glasses for hepatic vein and portal vein anastomosis operations, and at the same time, hepatic artery anastomosis operations need to be carried out under a microscope. When this surgical method is actually carried out, it places a relatively large burden on the surgeon's eyes and the whole body. Moreover, the anastomosis of liver transplantation blood vessels relies excessively on manual operation, so it requires high surgical experience from the surgeon, and the surgeon needs to study for a long time. At the same time, the vascular anastomosis time is relatively long, which easily leads to a high incidence of surgical complications and increases the surgical risk. Therefore, improvements are needed in this regard. Summary of the Invention

[0004] The purpose of the present invention is to provide a vascular anastomosis device for rapid liver transplantation using magnetic assistance to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A vascular anastomosis device for rapid liver transplantation using magnetic assistance, including long rods. The number of the long rods is two. At the bottom ends of the two long rods, round tubes are respectively fixedly installed. A first handle is threadedly sleeved on the outer surface of the round tube. An inner ring is movably sleeved inside the first handle. On one side of the outer surface of the inner ring facing the central positions of the two long rods, an inclined rod is hinged. The other end of the inclined rod is hinged to a cross bar. On the right end of the outer surface of the cross bar facing the round tube, a vertical rod is fixedly installed. On the side of the outer surface of the vertical rod facing the round tube, a pressing block is fixedly installed. On the side of the outer surface of the pressing block facing the round tube, an extension plate is movably connected. The outer surface of the extension plate is fixedly connected to the outer surface of the round tube. At the bottom of the inner wall on the right side of the extension plate, an auxiliary plate is fixedly installed. Magnets are respectively fixedly installed at the tops of the opposite surfaces of the two long rods.

[0006] Preferably, a limiting column is movably sleeved inside the cross bar. The outer surface of the limiting column is fixedly connected to the outer surface of the round tube. A baffle is fixedly sleeved on the side of the outer surface of the limiting column away from the round tube.

[0007] Preferably, reinforcing ribs are respectively fixedly installed at the bottoms of the opposite surfaces of the two long rods, the other ends of the reinforcing ribs are fixedly connected to the outer surfaces of the magnets, the outer surfaces of the two long rods are movably sleeved with bases, and the inner surfaces of the bases are movably sleeved with the outer surfaces of the magnets.

[0008] Preferably, round rods are movably sleeved inside the tops of the two long rods, the outer surfaces of the round rods are movably sleeved with the inner surfaces of the magnets, the outer surfaces of the round rods are fixedly sleeved with the inner surfaces of the bases, a partition block is movably connected between the two magnets, the outer surface of the partition block is movably sleeved with the inner surface of the base, a connecting plate is fixedly installed at the top of the partition block, and the outer surface of the connecting plate is movably sleeved with the inner surface of the base.

[0009] Preferably, a first spring is fixedly installed at the middle of the top of the inner surface of the base, the other end of the first spring is fixedly installed at the top of the connecting plate, and a first round hole and a second round hole located on the left side of the connecting plate are formed at the bottom of the left inner wall of the base.

[0010] Preferably, a clamping rod is movably sleeved inside the second round hole, the right end of the clamping rod penetrates through the connecting plate and extends into the connecting plate and is fixedly installed with an extension block, the outer surface of the extension block is movably sleeved with the inner surface of the connecting plate, a second spring is fixedly installed at the right end of the extension block, and the other end of the second spring is fixedly connected to the inner surface of the connecting plate.

[0011] Preferably, a fixing rod is fixedly installed at the bottom of the middle of the front end of the base, the outer surface of the fixing rod is movably sleeved with a U-shaped frame, and the outer surface of the U-shaped frame is movably connected to the outer surface of the base.

[0012] Preferably, a round shaft located above the fixing rod is movably sleeved at the top of the left end of the base, and a second handle is fixedly sleeved at the left end of the outer surface of the round shaft.

[0013] Preferably, an eccentric wheel is movably connected to the middle of the bottom end of the fixing rod, the outer surface of the eccentric wheel is movably connected to the outer surface of the base, the bottom end of the eccentric wheel is movably connected to the bottom of the inner surface of the U-shaped frame, the inner surface of the eccentric wheel is fixedly sleeved with the outer surface of the round shaft, and connecting springs are respectively fixedly installed on the left and right sides of the bottom end of the fixing rod, and the other ends of the connecting springs are fixedly connected to the bottom of the inner surface of the U-shaped frame.

[0014] The beneficial effects of the present invention are as follows:

[0015] 1. The present invention is provided with a first handle, a pressing block, an extension plate, an auxiliary plate and a magnet. When the first handle is rotated, the first handle will drive one end of the inclined rod through the built-in ring to move, so that the inclined rod generates a thrust on the cross bar, pushing the cross bar to drive the vertical rod and the pressing block to move and separate from the extension plate. At this time, the blood vessel can be passed through the round tube and turned out to the outer surface of the auxiliary plate. Since the magnetic poles of the two magnets are opposite, under the action of the magnet, the blood vessels located inside the round tube will be anastomosed together. In this way, magnetic assistance can be used for rapid vascular anastomosis in liver transplantation, thereby shortening the operation time and reducing the operation risk.

[0016] 2. The present invention is provided with a partition block, a connecting plate, a first round hole, a second round hole and a clamping rod. When the extension block is pressed, the extension block will drive the clamping rod to move along the inner surface of the connecting plate and compress the second spring, so that the clamping rod separates from the second round hole. Since the first spring is in a stretched state, under the restoring action of the first spring, the connecting plate will drive the partition block to move until the clamping rod is embedded in the first round hole under the restoring action of the second spring. At this time, the interception of the magnet by the partition block can be released, so as to facilitate the separation and blocking of the two magnets by means of the partition block.

[0017] 3. The present invention is provided with a fixed rod, a U-shaped frame, a second handle, an eccentric wheel and a connecting spring. When the second handle is rotated, the second handle will drive the eccentric wheel to rotate through the round shaft. When the eccentric wheel rotates 90 degrees, the eccentric wheel will no longer support the U-shaped frame. Also, because the connecting spring is in a stretched state, under the restoring action of the connecting spring, the U-shaped frame will move along the outer surface of the fixed rod, so as to lock the positions of the two long rods through the U-shaped frame and prevent the long rods from moving during the operation and affecting the progress of the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of the present invention;

[0019] Figure 2 is a schematic cross-sectional structural diagram of the top of the present invention;

[0020] Figure 3 is a schematic cross-sectional structural diagram of the clamping rod of the present invention;

[0021] Figure 4 is a schematic cross-sectional structural diagram of the U-shaped frame of the present invention;

[0022] Figure 5 is a schematic cross-sectional structural diagram of the side of the present invention;

[0023] Figure 6 is Figure 2 a partial enlarged structural diagram at A in

[0024] Figure 7 is Figure 3 The schematic diagram of the partially enlarged structure at position B in

[0025] Figure 8 is Figure 5 The schematic diagram of the partially enlarged structure at position C in

[0026] In the figure: 1. Long rod; 2. Round tube; 3. First handle; 4. Inner ring; 5. Inclined rod; 6. Cross bar; 7. Vertical rod; 8. Pressing block; 9. Extension plate; 10. Auxiliary plate; 11. Magnet; 12. Limit post; 13. Baffle; 14. Reinforcing rib; 15. Base; 16. Round rod; 17. Partition block; 18. Connecting plate; 19. First spring; 20. First round hole; 21. Second round hole; 22. Clamping rod; 23. Extension block; 24. Second spring; 25. Fixed rod; 26. U-shaped frame; 27. Round shaft; 28. Second handle; 29. Eccentric wheel; 30. Connecting spring. Specific embodiments

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0028] As Figures 1 to 8 shown, the embodiment of the present invention provides a vascular anastomosis device for rapid liver transplantation using magnetic assistance, including a long rod 1. The number of long rods 1 is two. The bottom ends of the two long rods 1 are respectively fixedly installed with round tubes 2. The outer surface of the round tube 2 is threadedly sleeved with a first handle 3. The inner part of the first handle 3 is movably sleeved with an inner ring 4. One side of the outer surface of the inner ring 4 facing the center position of the two long rods 1 is hinged with an inclined rod 5. The other end of the inclined rod 5 is hinged with a cross bar 6. The right end of the outer surface of the cross bar 6 facing the round tube 2 is fixedly installed with a vertical rod 7. The side of the outer surface of the vertical rod 7 facing the round tube 2 is fixedly installed with a pressing block 8. The side of the outer surface of the pressing block 8 facing the round tube 2 is movably connected with an extension plate 9. The outer surface of the extension plate 9 is fixedly connected with the outer surface of the round tube 2. The bottom of the inner wall on the right side of the extension plate 9 is fixedly installed with an auxiliary plate 10. The tops of the opposite surfaces of the two long rods 1 are respectively fixedly installed with magnets 11.

[0029] When turning the first handle 3, the first handle 3 will drive the built-in ring 4 to move along the outer surface of the circular tube 2, so that the inclined rod 5 hinged to the built-in ring 4 will move accordingly. Furthermore, the inclined rod 5 will generate a thrust on the cross bar 6, pushing the cross bar 6 to drive the vertical rod 7 and the pressing block 8 to move and separate from the extension plate 9. At this time, pass the blood vessel through the circular tube 2 and turn it outwards to the outer surface of the auxiliary plate 10, and then reverse the rotation of the first handle 3 to reset the pressing block 8, so as to press the blood vessel with the pressing block 8 and the extension plate 9. Since the magnetic poles of the two magnets 11 are opposite, the two magnets 11 will drive the long rod 1 and the circular tube 2 to move towards each other respectively. When the two magnets 11 are in contact with each other, the blood vessels inside the circular tube 2 will also anastomose together. Subsequently, the blood vessels can be sutured through the notch of the auxiliary plate 10, thus shortening the operation time, reducing the occurrence of blood vessel complications, and reducing the operation risk of the surgeon in charge.

[0030] Wherein, a limiting post 12 is movably sleeved inside the cross bar 6, the outer surface of the limiting post 12 is fixedly connected to the outer surface of the circular tube 2, and a baffle 13 is fixedly sleeved on one side of the outer surface of the limiting post 12 far away from the circular tube 2.

[0031] Due to the existence of the limiting post 12 and the baffle 13, the movement of the cross bar 6 will be restricted, thus ensuring the stability of the movement of the cross bar 6.

[0032] Wherein, reinforcing ribs 14 are respectively fixedly installed at the bottoms of the opposite surfaces of the two long rods 1, the other ends of the reinforcing ribs 14 are fixedly connected to the outer surfaces of the magnets 11, and the outer surfaces of the two long rods 1 are movably sleeved with bases 15, and the inner surfaces of the bases 15 are movably sleeved with the outer surfaces of the magnets 11.

[0033] Due to the existence of the reinforcing ribs 14, it will play a role in strengthening the connection between the long rod 1 and the magnet 11, thus improving the firmness of the connection between the long rod 1 and the magnet 11.

[0034] Wherein, round rods 16 are movably sleeved inside the tops of the two long rods 1, the outer surfaces of the round rods 16 are movably sleeved with the inner surfaces of the magnets 11, the outer surfaces of the round rods 16 are fixedly sleeved with the inner surfaces of the bases 15, a partition block 17 is movably connected between the two magnets 11, the outer surface of the partition block 17 is movably sleeved with the inner surface of the base 15, and a connecting plate 18 is fixedly installed at the top of the partition block 17, and the outer surface of the connecting plate 18 is movably sleeved with the inner surface of the base 15.

[0035] Due to the existence of the partition block 17 and the connecting plate 18, it will play a role in blocking and intercepting the magnet 11, and due to the existence of the round rod 16, the movement of the long rod 1 and the magnet 11 can be limited.

[0036] Among them, a first spring 19 is fixedly installed at the middle end of the inner surface of the base 15, and the other end of the first spring 19 is fixedly installed at the top end of the connecting plate 18. A first round hole 20 and a second round hole 21 located on the left side of the connecting plate 18 are provided at the bottom of the left inner wall of the base 15.

[0037] Since the first spring 19 is in a stretched state, under the restoring action of the first spring 19, the connecting plate 18 will move along the inner surface of the base 15.

[0038] Among them, a clamping rod 22 is movably sleeved inside the second round hole 21. The right end of the clamping rod 22 penetrates through the connecting plate 18 and extends into the connecting plate 18 and is fixedly installed with an extension block 23. The outer surface of the extension block 23 is movably sleeved with the inner surface of the connecting plate 18. The right end of the extension block 23 is fixedly installed with a second spring 24, and the other end of the second spring 24 is fixedly connected to the inner surface of the connecting plate 18.

[0039] When pushing the extension block 23, the extension block 23 will drive the clamping rod 22 to move along the inner surface of the connecting plate 18 and compress the second spring 24, so that the clamping rod 22 is separated from the second round hole 21, and the locking of the clamping rod 22 to the connecting plate 18 is released.

[0040] Among them, a fixing rod 25 is fixedly installed at the bottom of the middle part of the front end of the base 15. A U-shaped frame 26 is movably sleeved on the outer surface of the fixing rod 25, and the outer surface of the U-shaped frame 26 is movably connected to the outer surface of the base 15.

[0041] The outer surface of the fixing rod 25 and the inner surface of the U-shaped frame 26 are both smooth, so as to ensure that the U-shaped frame 26 will not get stuck when moving along the outer surface of the fixing rod 25.

[0042] Among them, a round shaft 27 located above the fixing rod 25 is movably sleeved at the top of the left end of the base 15. A second handle 28 is fixedly sleeved on the left end of the outer surface of the round shaft 27.

[0043] When rotating the second handle 28, the round shaft 27 will rotate along the inner surface of the base 15.

[0044] Among them, an eccentric wheel 29 is movably connected to the middle part of the bottom end of the fixing rod 25. The outer surface of the eccentric wheel 29 is movably connected to the outer surface of the base 15. The bottom end of the eccentric wheel 29 is movably connected to the bottom of the inner surface of the U-shaped frame 26. The inner surface of the eccentric wheel 29 is fixedly sleeved with the outer surface of the round shaft 27. Connecting springs 30 are respectively fixedly installed on the left and right sides of the bottom end of the fixing rod 25, and the other ends of the connecting springs 30 are fixedly connected to the bottom of the inner surface of the U-shaped frame 26.

[0045] Since the connecting spring 30 is in a stretched state, when the eccentric wheel 29 rotates by ninety degrees following the circular shaft 27, under the restoring action of the connecting spring 30, the U-shaped frame 26 will move along the outer surface of the fixed rod 25 towards the center of the base 15.

[0046] Working principle and usage process:

[0047] First, after the surgeon places the device, rotate the first handle 3, so that the first handle 3 drives one end of the inclined rod 5 to move through the built-in ring 4, thereby causing the other end of the inclined rod 5 to generate a thrust on the cross bar 6, pushing the cross bar 6 to drive the vertical rod 7 and the pressing block 8 to move towards the outside of the circular tube 2 and separate from the extension plate 9 until the cross bar 6 contacts the baffle 13. Subsequently, the surgeon can pass the blood vessel through the circular tube 2 and turn it outwards to the outer surface of the auxiliary plate 10, and then rotate the first handle 3 in the reverse direction, so that the pressing block 8 returns to its original position and cooperates with the extension plate 9 to press the turned-out blood vessel, thus completing the preparation work.

[0048] Subsequently, the surgeon presses the extension block 23, so that the extension block 23 drives the clamping rod 22 to move along the inner surface of the connecting plate 18 and compress the second spring 24 until the clamping rod 22 separates from the second round hole 21. Since the first spring 19 is in a stretched state, under the restoring action of the first spring 19, the connecting plate 18 will drive the partition block 17 and the clamping rod 22 to move along the inner surface of the base 15. When the clamping rod 22 aligns with the first round hole 20, under the restoring action of the second spring 24, the clamping rod 22 will be forced to return to its original position, so that the clamping rod 22 is inserted into the first round hole 20, thereby locking the connecting plate 18 and the partition block 17. At this time, since the magnetic poles of the two magnets 11 are opposite, under the action of the two magnets 11, the two long rods 1 will respectively drive the circular tube 2 to move along the outer surface of the circular rod 16 until the two magnets 11 are in contact with each other, so that the blood vessels located inside the circular tube 2 are anastomosed together.

[0049] Immediately afterwards, the surgeon rotates the second handle 28, so that the circular shaft 27 drives the eccentric wheel 29 to rotate. When the eccentric wheel 29 rotates by ninety degrees, the U-shaped frame 26 will lose the support of the eccentric wheel 29. At this time, the connecting spring 30 in a stretched state will return to its normal state, so that the U-shaped frame 26 moves along the outer surface of the fixed rod 25, and then locks the positions of the two long rods 1 through the U-shaped frame 26, preventing the long rods 1 from shifting during the operation and affecting the progress of the operation. Finally, the surgeon can start the suture operation from the outside to the inside of the blood vessel through the notch opened on the auxiliary plate 10. With the mutual cooperation of each mechanism, the vascular anastomosis for rapid liver transplantation is realized by magnetic assistance, thereby reducing the difficulty of vascular anastomosis, shortening the operation time, and at the same time reducing the occurrence of vascular complications and the surgical risk.

[0050] It should be noted that in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variation thereof is intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.

[0051] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A vascular anastomosis device for rapid liver transplantation using magnetic assistance, comprising a long rod (1), characterized in that: The number of the long rods (1) is two, and a round tube (2) is fixedly mounted on the bottom ends of the two long rods (1), a first handle (3) is threadedly sleeved on the outer surface of the round tube (2), an internal ring (4) is movably sleeved inside the first handle (3), an inclined rod (5) is hingedly mounted on the outer surface of the internal ring (4) on the side facing the center position of the two long rods (1), a cross rod (6) is hingedly mounted on the other end of the inclined rod (5), a vertical rod (7) is fixedly mounted on the right end of the outer surface of the cross rod (6) facing the round tube (2), a pressing block (8) is fixedly mounted on the outer surface of the vertical rod (7) facing the round tube (2), an extension plate (9) is movably connected to the outer surface of the pressing block (8) facing the round tube (2), the outer surface of the extension plate (9) is fixedly connected to the outer surface of the round tube (2), an auxiliary plate (10) is fixedly mounted on the bottom of the right inner wall of the extension plate (9), and magnets (11) are fixedly mounted on the tops of the opposite surfaces of the two long rods (1).

2. The vascular anastomosis device for rapid liver transplantation using magnetic assistance according to claim 1, characterized in that: The interior of the cross bar (6) is movably sleeved with a limiting column (12), the outer surface of the limiting column (12) is fixedly connected to the outer surface of the circular tube (2), and a baffle (13) is fixedly sleeved on the side of the outer surface of the limiting column (12) away from the circular tube (2).

3. The vascular anastomosis device for rapid liver transplantation using magnetic assistance according to claim 1, characterized in that: Reinforcing ribs (14) are fixedly mounted at the bottoms of the opposing surfaces of the two long rods (1), the other ends of the reinforcing ribs (14) are fixedly connected to the outer surface of the magnet (11), the outer surfaces of the two long rods (1) are movably sleeved with bases (15), and the inner surfaces of the bases (15) are movably sleeved with the outer surface of the magnet (11).

4. The vascular anastomosis device for rapid liver transplantation using magnetic assistance according to claim 1, characterized in that: A round rod (16) is movably sleeved inside the top ends of the two long rods (1), the outer surface of the round rod (16) is movably sleeved with the inner surface of the magnet (11), the outer surface of the round rod (16) is fixedly sleeved with the inner surface of the base (15), a partition block (17) is movably connected between the two magnets (11), the outer surface of the partition block (17) is movably sleeved with the inner surface of the base (15), a connecting plate (18) is fixedly installed on the top end of the partition block (17), and the outer surface of the connecting plate (18) is movably sleeved with the inner surface of the base (15).

5. The vascular anastomosis device for rapid liver transplantation using magnetic assistance according to claim 3, characterized in that: A first spring (19) is fixedly mounted at the middle end of the top of the inner surface of the base (15), and the other end of the first spring (19) is fixedly mounted on the top of the connecting plate (18). A first circular hole (20) and a second circular hole (21) located on the left side of the connecting plate (18) are formed at the bottom of the left inner wall of the base (15).

6. The vascular anastomosis device for rapid liver transplantation using magnetic assistance according to claim 5, characterized in that: A clamping rod (22) is movably sleeved inside the second circular hole (21); the right end of the clamping rod (22) passes through the connecting plate (18) and extends to the inside of the connecting plate (18) and is fixedly installed with an extension block (23); the outer surface of the extension block (23) is movably sleeved with the inner surface of the connecting plate (18); a second spring (24) is fixedly installed at the right end of the extension block (23); the other end of the second spring (24) is fixedly connected to the inner surface of the connecting plate (18).

7. The vascular anastomosis device for rapid liver transplantation using magnetic assistance according to claim 3, characterized in that: A fixing rod (25) is fixedly mounted at the bottom of the middle part of the front end of the base (15); a U-shaped frame (26) is movably sleeved on the outer surface of the fixing rod (25); and the outer surface of the U-shaped frame (26) is movably connected to the outer surface of the base (15).

8. The vascular anastomosis device for rapid liver transplantation using magnetic assistance according to claim 3, characterized in that: A round shaft (27) located above the fixed rod (25) is movably sleeved on the top of the left end of the base (15), and a second handle (28) is fixedly sleeved on the left end of the outer surface of the round shaft (27).

9. The vascular anastomosis device for rapid liver transplantation using magnetic assistance according to claim 7, characterized in that: An eccentric wheel (29) is movably connected to the middle of the bottom end of the fixing rod (25); the outer surface of the eccentric wheel (29) is movably connected to the outer surface of the base (15); the bottom end of the eccentric wheel (29) is movably connected to the bottom of the inner surface of the U-shaped frame (26); the inner surface of the eccentric wheel (29) is fixedly sleeved to the outer surface of the circular shaft (27); connecting springs (30) are fixedly installed on the left and right sides of the bottom end of the fixing rod (25), respectively; the other end of the connecting spring (30) is fixedly connected to the bottom of the inner surface of the U-shaped frame (26).

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