A thoracic cavity distraction device

Abstract

The utility model discloses a thoracic cavity strutting device relates to surgical instrument technical field, including handle, handle top fixed mounting support subassembly, handle inside movable installation drive subassembly, drive subassembly output is equipped with slider no.

Description

Technical Field

[0001] This utility model belongs to the field of surgical instruments, specifically relating to a chest cavity opening device. Background Technology

[0002] Thoracic retractors are divided into sternal retractors and rib retractors. Their function is to open the sternum and ribs, thereby fully exposing the surgical field and providing convenient conditions for surgical operation. Thoracic surgery first requires opening the surface of the patient's chest cavity, and then using thoracic retractors to open the wound before performing thoracic surgery.

[0003] A search revealed Chinese patent application number CN202221029415.8, which discloses a thoracic cavity expansion device for cardiothoracic surgery, relating to the field of medical device technology. The key technical points are: a sliding box containing a bottom-opening groove; a sliding expansion device within the groove, comprising a knob, a threaded rod, a bearing, and two sliders; the bearing is embedded at the end of the groove, the threaded rod is horizontally placed within the groove, its end fixedly connected to the bearing, and the end of the threaded rod away from the bearing passing through the groove and the sliding box being fixedly connected to the knob. During the expansion of the thoracic cavity, medical personnel can judge the compressive strength between the expansion plate and the thoracic cavity sidewall based on the degree of deformation of the air cushion, thereby preventing thoracic cavity tears. Furthermore, the air cushion deforms during compression, reducing the probability of pressure sores on the thoracic cavity sidewall.

[0004] The area of ​​contact between the open portion and the patient's wound is small, and the ribs and cortex are subjected to greater compressive force, which can easily cause secondary damage to the patient's wound and ribs. At the same time, the open chest can easily compress the lungs and trachea, which can lead to poor endotracheal intubation, resulting in intraoperative hypoxia and decreased blood oxygenation, thus affecting the progress of the operation.

[0005] Therefore, we propose a chest cavity opening device. Utility Model Content

[0006] This invention provides a chest cavity expansion device to solve the technical problems mentioned in the background art.

[0007] To solve the above-mentioned technical problems, this utility model provides a chest cavity opening device, including a handle, a support component movably installed on the top of the handle, a drive component movably installed inside the handle, a slider 1 provided at the output end of the drive component, two slider 1s provided, the two slider 1s are arranged symmetrically, a bracket is fixedly installed at the bottom of each slider 1, the bracket is L-shaped, and a hook plate is movably installed at the end of the bracket away from the slider 1, and a hook groove is opened below the hook plate.

[0008] Preferably, the drive assembly includes a bidirectional threaded rod, which is rotatably mounted inside the handle. A slider is arranged on the bidirectional threaded rod and is threadedly connected to the bidirectional threaded rod. One end of the bidirectional threaded rod passes through the handle. A turntable is fixedly mounted on one side of the bidirectional threaded rod, and a grip is fixedly mounted on the outside of the turntable. The grip is positioned at an eccentric position on the turntable.

[0009] Preferably, a guide rod is fixedly installed inside the handle. There are two guide rods, which are symmetrically arranged. The guide rod passes through the slider and the slider is slidably connected to the guide rod.

[0010] Preferably, the top of the bracket has an inner cavity, a slide rod is fixedly installed in the inner cavity, a second slider is slidably installed on the slide rod, buffer springs are fixedly installed at both ends of the second slider, the buffer springs are sleeved on the outside of the slide rod, and the other end of the buffer springs is fixedly connected to the inner wall of the inner cavity, and the hook plate is fixedly connected to the second slider.

[0011] Preferably, the bottom of the hook plate has a through hole, and a fastening bolt is provided in the through hole. The bottom of the second slider has a threaded hole at a position corresponding to the through hole. The fastening bolt passes through the through hole and is engaged with the threaded hole.

[0012] Preferably, the support assembly includes a sleeve, which is fixedly installed on the top of the handle. The sleeve is located in the middle of the handle. A T-shaped hole is opened in the sleeve, and a movable block is slidably installed in the T-shaped hole. A top rod is fixedly installed on the top of the movable block, and a head support is fixedly installed on the other end of the top rod. An adjustment block is fixedly installed on the outside of the sleeve, and the adjustment block is used to connect to an external air source.

[0013] Preferably, the headrest is C-shaped, and a silicone pad is glued to the inner annular surface of the headrest.

[0014] Preferably, the adjusting block includes a protective sleeve, which is fixedly installed inside the sleeve. A pressure spring is fixedly connected to one end of the protective sleeve near the movable block, and the end of the pressure spring away from the movable protective sleeve is fixedly connected to the movable block.

[0015] The protective sleeve is also rotatably connected to a take-up reel, and a pull rope is wound around the outside of the take-up reel. The free end of the pull rope is fixedly connected to the movable block.

[0016] Preferably, a rotating sleeve is fixedly connected to the lower end of the take-up reel, the rotating sleeve is rotatably connected to the inner wall of the sleeve, and a support spring is inserted inside the rotating sleeve, the support spring being fixedly connected to the sleeve.

[0017] Preferably, a docking post is fixedly connected to the upper end of the take-up reel, a limiting sleeve is fitted on the outer wall of the docking post, a plurality of limiting blocks are fixedly connected to the outer wall of the docking post, and a plurality of limiting notches are opened on the inner wall of the limiting sleeve;

[0018] The upper end of the limiting sleeve is fixedly connected to a reset ring outside the sleeve. The lower end of the reset ring is fixedly connected to a positioning block. The positioning block is fixedly connected to the sleeve. The lower end of the reset ring is movably connected to several ratchet teeth. The upper end of the positioning block is fixedly connected to several ratchet teeth that cooperate with the ratchet teeth.

[0019] The upper end of the docking column is rotatably connected to a pressure rod, and a limiting plate is fixedly connected to the outer wall of the pressure rod. The upper end of the pressure rod passes through the top end of the reset ring, and the pressure rod is slidably connected to the reset ring.

[0020] This invention has the following advantages over the prior art:

[0021] 1. This utility model discloses a chest cavity opening device, which uses a hook plate to open the wound. The hook plate has a hook groove to fix the cortex and ribs. The hook plate and the second slider move together. At this time, one side of the second slider is stretched and the other side is compressed, thereby providing a buffer for the hook plate, ensuring the stability of the hook plate and avoiding secondary injury to the patient caused by rigid opening. By setting a fastening bolt, the fastening bolt is threaded to the second slider, which can quickly disassemble the hook plate and facilitate the replacement of hook plates of different lengths. This allows it to adapt to different open-chest surgeries and the different opening lengths of patients of different body sizes, ensuring that the hook plate fits the patient's wound.

[0022] 2. The present invention provides a chest cavity opening device. After the chest cavity is opened, the top rod is adjusted by adjusting the adjustment block, so that the top rod pushes the headrest to move. The headrest can lift the patient's head, so that the trachea is fully opened and the compression of the endotracheal tube is avoided. The headrest is C-shaped and can fit with the patient's chin to improve the stability of head fixation. In addition, the headrest is equipped with a silicone pad to make the patient more comfortable. Attached Figure Description

[0023] Figure 1 This is a structural diagram of a chest cavity opening device according to the present invention;

[0024] Figure 2 This is a cross-sectional view of the handle in a chest cavity expansion device according to the present invention.

[0025] Figure 3 This is a structural diagram of the support in a chest cavity expansion device according to the present invention;

[0026] Figure 4 This is an exploded structural diagram of the support structure in the chest cavity expansion device of this utility model;

[0027] Figure 5 This is a structural diagram of the support component in a chest cavity expansion device according to the present invention;

[0028] Figure 6 This is an exploded structural diagram of the support component in a chest cavity expansion device according to the present invention;

[0029] Figure 7 This is a diagram showing the internal structure of the sleeve in a chest cavity expansion device according to this utility model;

[0030] Figure 8 This is a diagram showing the positional relationship of the compression springs in a chest expansion device according to this utility model;

[0031] Figure 9 This is an exploded view of the adjusting block in the chest cavity expansion device of this utility model.

[0032] The diagram labels are as follows: 1. Handle; 2. Support assembly; 3. Drive assembly; 4. Bracket; 5. Hook plate; 6. Two-way threaded rod; 7. Grip; 8. Turntable; 9. Slider 1; 10. Guide rod; 11. Buffer spring; 12. Inner cavity; 13. Slider 2; 14. Fastening bolt; 15. Hook groove; 16. Through hole; 17. Slide rod; 18. Sleeve; 19. Adjusting block; 20. Top rod; 21. Head support; 22. Silicone pad; 23. T-hole; 24. Movable block; 190. Protective sleeve; 191. Take-up reel; 192. Pull rope; 193. Rotating sleeve; 194. Support spring; 195. Limiting block; 196. Down pressure rod; 197. Limiting plate; 198. Positioning block; 199. Reset ring; 110. Limiting notch; 111. Compression spring; 112. Limiting sleeve. Detailed Implementation

[0033] The present invention will be further described below with reference to specific embodiments. The accompanying drawings are for illustrative purposes only, representing schematic diagrams rather than actual physical objects, and should not be construed as limiting the scope of this patent. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0034] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0035] Please see Figure 1-9 This utility model provides a technical solution: a chest cavity opening device, including a handle 1, a support component 2 fixedly installed on the top of the handle 1, a drive component 3 movably installed inside the handle 1, a slider 9 provided at the output end of the drive component 3, two sliders 9 are provided, the two sliders 9 are arranged symmetrically, a bracket 4 is fixedly installed at the bottom of each slider 9, the bracket 4 is L-shaped, and a hook plate 5 is movably installed at the end of the bracket 4 away from the slider 9, and a hook groove 15 is opened below the hook plate 5.

[0036] Furthermore, the drive assembly 3 includes a bidirectional threaded rod 6, which is rotatably mounted inside the handle 1. A slider 9 is arranged on the bidirectional threaded rod 6 and is threadedly connected to the bidirectional threaded rod 6. One end of the bidirectional threaded rod 6 passes through the handle 1. A turntable 8 is fixedly mounted on one side of the bidirectional threaded rod 6, and a handle 7 is fixedly mounted on the outside of the turntable 8. The handle 7 is positioned at an eccentric position on the turntable 8.

[0037] In this embodiment, rotating the handle 7 causes the turntable 8 to rotate, which in turn causes the bidirectional threaded rod 6 to rotate. The rotation of the bidirectional threaded rod 6 causes the two sliders 9 to slide to both sides, so that the sliders 9 drive the support 4 to unfold. The hook plates 5 on both sides unfold the thoracic cavity. The bidirectional threaded rod 6 is used as the driving method, which has higher stability and avoids the hook plates 5 from loosening during the operation.

[0038] Furthermore, a guide rod 10 is fixedly installed inside the handle 1. There are two guide rods 10, which are symmetrically arranged. The guide rod 10 passes through the slider 9, and the slider 9 is slidably connected to the guide rod 10.

[0039] In this embodiment, by providing a guide rod 10 inside the handle 1, and slidably connecting the guide rod 10 to the slider 9, the slider 9 slides more smoothly inside the handle 1 during the chest cavity expansion process, avoiding the situation where the slider 9 gets stuck.

[0040] Furthermore, an inner cavity 12 is provided inside the top of the bracket 4. A slide rod 17 is fixedly installed inside the inner cavity 12. A second slider 13 is slidably installed on the slide rod 17. Buffer springs 11 are fixedly installed at both ends of the second slider 13. The buffer springs 11 are sleeved on the outside of the slide rod 17, and the other end of the buffer springs 11 is fixedly connected to the inner wall of the inner cavity 12. The hook plate 5 is fixedly connected to the second slider 13.

[0041] In this embodiment, when the support 4 is unfolded, the support 4 pulls the hook plate 5 to move, and the hook plate 5 drives the second slider 13 to slide along the slide rod 17. At this time, the second slider 13 stretches the buffer spring 11 on one side and compresses the buffer spring 11 on the other side, thereby providing buffer for the hook plate 5, ensuring the stability of the hook plate 5 and avoiding secondary injury to the patient caused by rigid opening.

[0042] Furthermore, a through hole 16 is provided at the bottom of the hook plate 5, and a fastening bolt 14 is provided in the through hole 16. A threaded hole is provided at the bottom of the slider 2 13 corresponding to the position of the through hole 16. The fastening bolt 14 passes through the through hole 16 and is engaged with the threaded hole.

[0043] In this embodiment, by setting a fastening bolt 14, which is threadedly connected to the slider 13, the hook plate 5 can be quickly disassembled, making it easy to replace hook plates 5 of different lengths. This adapts to different open-chest surgeries and the varying opening lengths of patients of different body sizes, ensuring that the hook plate 5 fits snugly against the patient's wound.

[0044] Furthermore, the support assembly 2 includes a sleeve 18, which is rotatably connected to the handle 1. Specifically, a locking bolt is provided at the rotatable connection between the sleeve 18 and the handle 1. The angle of the sleeve 18 can be adjusted as needed by means of the locking bolt. The sleeve 18 is located in the middle of the handle 1. A T-shaped hole 23 is provided inside the sleeve 18. A movable block 24 is slidably installed inside the T-shaped hole 23. A top rod 20 is fixedly installed on the top of the movable block 24. A head support 21 is fixedly installed on the other end of the top rod 20. An adjusting block 19 is fixedly installed on the outside of the sleeve 18. The adjusting block 19 adjusts the extension amount of the top rod 20.

[0045] Adjusting block 19 includes protective sleeve 190, which is fixedly installed inside sleeve 18. A pressure spring 111 is fixedly connected to one end of protective sleeve 190 near movable block 24. The end of pressure spring 111 away from movable protective sleeve 190 is fixedly connected to movable block 24. Continuous pressure can be applied to push rod 20 through pressure spring 111.

[0046] Inside the protective sleeve 190, a take-up reel 191 is rotatably connected, and a pull rope 192 is wound around the outside of the take-up reel 191. The free end of the pull rope 192 is fixedly connected to the movable block 24.

[0047] To limit the position of the take-up reel 191, a rotating sleeve 193 is fixedly connected to the lower end of the take-up reel 191. The rotating sleeve 193 is rotatably connected to the inner wall of the sleeve 18, and a support spring 194 is also inserted inside the rotating sleeve 193. The support spring 194 is fixedly connected to the sleeve 18. Specifically, a circular groove is opened on the inner wall of the sleeve 18, and the rotating sleeve 193 is inserted into the circular groove and can rotate within the circular groove. More specifically, the lower end of the support spring 194 is located in the circular groove, and the upper end is located inside the rotating sleeve 193.

[0048] A docking post is fixedly connected to the upper end of the take-up reel 191. A limiting sleeve 112 is fitted onto the outer wall of the docking post. Specifically, several limiting blocks 195 are fixedly connected to the outer wall of the docking post. Several limiting notches 110 are formed on the inner wall of the limiting sleeve 112. More specifically, the upper ends of the limiting blocks 195 are all chamfered, and the lower ends of the limiting notches 110 are all rounded. This facilitates the entry of the limiting blocks 195 into the limiting notches 110. The upper end of the limiting sleeve 112 is located at the sleeve 18. An external fixed connection is provided with a reset ring 199. A positioning block 198 is fixedly connected to the lower end of the reset ring 199. The positioning block 198 is fixedly connected to the sleeve 18. Several ratchet teeth are movably connected to the lower end of the reset ring 199. Several ratchet teeth that cooperate with the ratchet teeth are fixedly connected to the upper end of the positioning block 198. The reset ring 199 can be limited by the cooperation of the ratchet teeth. Specifically, several grooves are fixedly connected to the lower end of the reset ring 199. The ratchet teeth are located in the grooves, and a top force spring is fixedly connected to the upper end of each ratchet tooth.

[0049] A pressing rod 196 is rotatably connected to the upper end of the docking column. A limiting plate 197 is fixedly connected to the outer wall of the pressing rod 196. The upper end of the pressing rod 196 passes through the top end of the reset ring 199, and the pressing rod 196 is slidably connected to the reset ring 199. Specifically, a circular channel is opened at the upper end of the reset ring 199. The pressing rod 196 passes through the reset ring 199 through the circular channel. A limiting notch 110 is symmetrically opened on the inner wall of the circular channel. A limiting plate 197 is symmetrically fixedly connected to the outer wall of the pressing rod 196. The limiting plate 197 is located within the limiting notch 110.

[0050] When the push rod 20 is inside the sleeve 18 and the pressure spring 111 is in a compressed state, when the push rod 20 moves toward the patient's jaw when needed, the lower pressure rod 196 can be pressed to make the limiting block 195 disengage from the limiting notch 110. At this time, the pressure spring 111 will push the push rod 20 to move out of the sleeve 18 and closer to the patient's jaw, thereby using the headrest 21 to push the patient's head up from the patient's jaw, thereby opening the trachea, increasing the airflow, and preventing the patient's head from tilting during the operation and affecting normal breathing.

[0051] When the patient’s head tilt angle reaches the required level, the pressure bar 196 is released and the limiting block 195 re-enters the limiting notch 110, thereby completing the restriction of the pressure bar 196 and preventing the top bar 20 from continuing to move.

[0052] After use, the reset ring 199 can be rotated directly to drive the limiting sleeve 112 to rotate, which in turn drives the take-up wheel 191 to rotate to take up the wire, thus resetting the push rod 20. By using this method to take up and release the push rod 20, the force of the push rod 20 can be precisely controlled to avoid causing discomfort to the patient.

[0053] When the reset ring 199 rotates to retract the wire, the ratchet below the reset ring 199 will extend and retract up and down, thereby preventing the ratchet from affecting the rotation of the reset ring 199.

[0054] Furthermore, the headrest 21 is C-shaped, and a silicone pad 22 is glued to the inner annular surface of the headrest 21.

[0055] In this embodiment, the headrest 21 is C-shaped and can fit snugly against the patient's chin, improving the stability of head fixation. The headrest 21 also has a silicone pad 22 inside, making the patient more comfortable.

[0056] Working principle:

[0057] During the surgery, an incision is first made in the patient's chest cavity using a scalpel. After the incision is opened, the handle 7 is rotated, which drives the turntable 8 to rotate, thereby rotating the bidirectional threaded rod 6. The rotation of the bidirectional threaded rod 6 causes the two sliders 9 to slide to the sides, thus unfolding the support 4. The hook plates 5 on both sides unfold the chest cavity. A guide rod 10 is set in the handle 1, which is slidably connected to the sliders 9. During the chest cavity unfolding process, the sliders 9 slide more smoothly in the handle 1, avoiding jamming. The hook plates 5 have hook grooves 15, which can fix the cortex and ribs, thereby unfolding the chest cavity. When the support 4 unfolds, the support 4 pulls the hook plates 5 to move. The hook plates 5 drive the sliders 13 to slide along the slide rod 17. At this time, one side of the sliders 13 is stretched. The buffer spring 11 is compressed on the other side of the slider 2 13, thereby providing cushioning for the hook plate 5, ensuring the stability of the hook plate 5 and avoiding secondary injury to the patient caused by rigid opening. By setting the fastening bolt 14, which is threadedly connected to the slider 2 13, the hook plate 5 can be quickly disassembled, making it easy to replace hook plates 5 of different lengths, thus adapting to different open-chest surgeries and different opening lengths for patients of different body sizes, ensuring that the hook plate 5 fits the patient's wound. After the chest cavity is opened, the patient's head can be lifted by turning the head support 21, so that the trachea can be fully opened, avoiding compression of the endotracheal tube. The head support 21 is C-shaped and can fit against the patient's chin, improving the stability of head fixation. The head support 21 is equipped with a silicone pad 22, making the patient more comfortable.

[0058] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A chest cavity expansion device, comprising a handle (1), characterized in that: The top of the handle (1) is movably mounted with a support assembly (2), and the handle (1) is movably mounted with a drive assembly (3). The output end of the drive assembly (3) is provided with a slider (9). There are two sliders (9), which are arranged symmetrically. The bottom of each slider (9) is fixedly mounted with a bracket (4). The bracket (4) is L-shaped, and a hook plate (5) is movably mounted on the end of the bracket (4) away from the slider (9). A hook groove (15) is provided below the hook plate (5).

2. The chest cavity expansion device according to claim 1, characterized in that, The drive assembly (3) includes a bidirectional threaded rod (6), which is rotatably mounted inside the handle (1). A slider (9) is arranged on the bidirectional threaded rod (6) and is threadedly connected to the bidirectional threaded rod (6). One end of the bidirectional threaded rod (6) passes through the handle (1). A turntable (8) is fixedly mounted on one side of the bidirectional threaded rod (6). A handle (7) is fixedly mounted on the outside of the turntable (8) and is positioned eccentrically on the turntable (8).

3. The chest cavity expansion device according to claim 1, characterized in that, The handle (1) is fixedly installed with a guide rod (10). There are two guide rods (10), which are arranged symmetrically. The guide rod (10) passes through the slider (9), and the slider (9) is slidably connected to the guide rod (10).

4. The chest cavity expansion device according to claim 1, characterized in that, The bracket (4) has an inner cavity (12) inside its top end. A slide rod (17) is fixedly installed inside the inner cavity (12). A second slider (13) is slidably installed on the slide rod (17). Buffer springs (11) are fixedly installed at both ends of the second slider (13). The buffer springs (11) are sleeved on the outside of the slide rod (17), and the other end of the buffer springs (11) is fixedly connected to the inner wall of the inner cavity (12). The hook plate (5) is fixedly connected to the second slider (13).

5. A chest cavity expansion device according to claim 4, characterized in that, The bottom of the hook plate (5) is provided with a through hole (16), and a fastening bolt (14) is provided in the through hole (16). The bottom of the slider (13) is provided with a threaded hole at the position corresponding to the through hole (16). The fastening bolt (14) passes through the through hole (16) and is engaged with the threaded hole.

6. The chest cavity expansion device according to claim 1, characterized in that, The support assembly (2) includes a sleeve (18). The sleeve (18) is fixedly installed on the top of the handle (1). The sleeve (18) is located in the middle of the handle (1). A T-shaped hole (23) is opened in the sleeve (18). A movable block (24) is slidably installed in the T-shaped hole (23). A top rod (20) is fixedly installed on the top of the movable block (24). A head support (21) is fixedly installed at the other end of the top rod (20). An adjusting block (19) is fixedly installed on the outside of the sleeve (18).

7. A chest cavity expansion device according to claim 6, characterized in that, The headrest (21) is C-shaped, and a silicone pad (22) is glued to the inner annular surface of the headrest (21).

8. A chest cavity expansion device according to claim 6, characterized in that, The adjusting block (19) includes a protective sleeve (190), which is fixedly installed inside the sleeve (18). A pressure spring (111) is fixedly connected to one end of the protective sleeve (190) near the movable block (24), and the end of the pressure spring (111) away from the movable protective sleeve (190) is fixedly connected to the movable block (24). The protective sleeve (190) is also rotatably connected to a take-up reel (191), and a pull rope (192) is wound around the outside of the take-up reel (191). The free end of the pull rope (192) is fixedly connected to the movable block (24).

9. A chest cavity expansion device according to claim 8, characterized in that, The lower end of the take-up reel (191) is fixedly connected to a rotating sleeve (193), which is rotatably connected to the inner wall of the sleeve (18). A support spring (194) is also inserted inside the rotating sleeve (193), and the support spring (194) is fixedly connected to the sleeve (18).

10. A chest cavity expansion device according to claim 9, characterized in that, The upper end of the take-up reel (191) is fixedly connected to a docking post, and a limiting sleeve (112) is fitted on the outer wall of the docking post. Several limiting blocks (195) are fixedly connected on the outer wall of the docking post, and several limiting notches (110) are opened on the inner wall of the limiting sleeve (112). The upper end of the limiting sleeve (112) is fixedly connected to the outside of the sleeve (18) with a reset ring (199), the lower end of the reset ring (199) is fixedly connected to a positioning block (198), the positioning block (198) is fixedly connected to the sleeve (18), and the lower end of the reset ring (199) is movably connected to a number of ratchet teeth, and the upper end of the positioning block (198) is fixedly connected to a number of ratchet teeth that cooperate with the ratchet teeth; The upper end of the docking column is rotatably connected to a pressure rod (196), and a limiting plate (197) is fixedly connected to the outer wall of the pressure rod (196). The upper end of the pressure rod (196) passes through the top end of the reset ring (199), and the pressure rod (196) is slidably connected to the reset ring (199).

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