Burn plastic wound debridement healing device

Abstract

The present application relates to burn negative pressure wound debridement technical field, especially a kind of burn plastic surgery wound debridement healing promotion device, it includes movable shell, the movable shell is formed by a plurality of movable body splicing, the movable body one side edge is equipped with sliding slot, the movable body other side edge is fixedly connected with slide bar, the slide bar of adjacent movable body is slidably connected in sliding slot inner wall, the movable body axle center position is fixedly connected with suction tube one end, suction tube other end is fixedly connected with negative pressure pump.By adjusting the height between each movable body, the shape of entire movable shell can be changed, the movable body in middle part is pushed upward, the middle part of movable shell can be bulged, form an arched shell, so that movable body does not contact wound, avoid its attached on wound, large area of stinging wound, and the movable shell of middle part bulge can protect part of wound, prevent from touching wound position before scabbing, lead to severe pain or affect scabbing.

Description

Technical Field

[0001] This invention relates to the field of negative pressure wound debridement technology for burns, and in particular to a device for debridement and healing promotion of burn and plastic surgery wounds. Background Technology

[0002] Negative pressure wound therapy (NPWT) for burns and plastic surgery, commonly known as "negative pressure suction," utilizes intelligently controlled negative pressure suction devices. Through specialized dressings and tubing, it provides closed drainage and treatment for burns or other complex wounds. This actively removes wound exudate, necrotic tissue, and bacteria, thereby promoting granulation tissue growth and creating favorable conditions for subsequent skin grafting or flap repair surgeries.

[0003] Currently, Chinese invention patent application number 202411640598.0 discloses a negative pressure wound debridement and healing device for burn and plastic surgery wounds. It promotes blood circulation and healing of burn and plastic surgery wounds through dynamic negative pressure technology, reduces the risk of infection, improves treatment effect and patient comfort, and allows for reusable application and removal of the dressing. However, its flexible structure adheres to the entire wound, causing extensive stinging pain, especially when removing it. Before the wound scabs over, touching the wound does not provide protection, which can lead to severe pain or affect scab formation. Summary of the Invention

[0004] The technical problem to be solved by the present invention is that the flexible structure in the related technology will adhere to the wound all over the surface, causing large-area stinging pain to the wound, especially when it is removed. Before the wound scabs over, touching the wound will not provide protection, which will lead to severe pain or affect the scab formation.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a burn and plastic surgery wound cleaning and healing device, which includes a movable shell, the movable shell being formed by splicing multiple movable bodies, the movable bodies having grooves on their edges, the movable bodies having slide bars fixedly connected to the edges symmetrical to the grooves, the slide bars of adjacent movable bodies being slidably connected to the inner wall of the grooves, one end of a suction tube being fixedly connected to the axial position of the movable body, and the other end of the suction tube being fixedly connected to a negative pressure pump.

[0006] As a preferred embodiment of the burn and plastic surgery wound cleaning and healing device of the present invention, a first sealing strip is installed on the top of the movable body, the top of the inner wall of the chute, and the top of the slide bar, and a second sealing strip is installed on the bottom of the movable body, the bottom of the inner wall of the chute, and the bottom of the slide bar.

[0007] As a preferred embodiment of the burn and plastic surgery wound cleaning and healing device of the present invention, wherein: the movable body sidewalls on both sides of the slide groove and the slide bar are respectively provided with a third sealing strip.

[0008] As a preferred embodiment of the burn and plastic surgery wound cleaning and healing device of the present invention, the slide bar is provided with a toothed groove, and the inner wall of the slide groove is provided with a plurality of locking members, which are used to engage with the toothed groove to lock the relative position of adjacent moving parts.

[0009] As a preferred embodiment of the burn and plastic surgery wound cleaning and healing device of the present invention, the locking member includes a locking block and a first spring. The inner wall of the slide groove is provided with a receiving groove. The inner wall of the receiving groove is slidably connected to the locking block. One side of the locking block is provided with teeth and engages with the tooth groove. The other side of the locking block is fixedly connected to one end of the first spring. The first spring is fixedly connected to the inner end wall of the receiving groove.

[0010] As a preferred embodiment of the burn and plastic surgery wound cleaning and healing device of the present invention, wherein: the locking block is fixedly connected to one end of the telescopic rod, the other end of the telescopic rod is fixedly connected to the inner end wall of the receiving groove, and the telescopic rod is connected to the second branch pipe through the first branch pipe.

[0011] As a preferred embodiment of the burn and plastic surgery wound debridement and healing device of the present invention, wherein: one end of the second branch tube is fixedly connected to the insertable movable body, the other end of the second branch tube is connected to the connector tube, and the connector tube is connected to the control component.

[0012] As a preferred embodiment of the burn and plastic surgery wound debridement and healing promotion device of the present invention, the control component includes a cylinder, a piston head, a first movable rod and a mushroom head. The bottom of the cylinder is connected to a connector pipe, the piston head is slidably connected to the inner wall of the cylinder, one end of the first movable rod is fixedly connected to the top of the piston head, the first movable rod passes through the top of the cylinder, and the mushroom head is fixedly connected to the top of the first movable rod.

[0013] As a preferred embodiment of the burn and plastic surgery wound cleaning and healing device of the present invention, wherein: one end of the second spring is fixedly connected to the bottom wall of the cylinder, and the other end of the second spring is fixedly connected to the piston head.

[0014] As a preferred embodiment of the burn and plastic surgery wound debridement and healing promotion device of the present invention, the telescopic rod includes a fixed cylinder, a first piston head and a second movable rod. The bottom of the fixed cylinder is fixedly connected to the inner wall of the receiving groove, the inner wall of the fixed cylinder is slidably connected to the first piston head, the first piston head is fixedly connected to one end of the second movable rod, and the other end of the second movable rod is fixedly connected to a locking block.

[0015] The beneficial effects of the present invention are as follows: By adjusting the height between each movable body, the present invention can change the shape of the entire movable shell. Pushing the movable body located in the middle upwards can make the middle of the movable shell bulge, forming an arched shell, so that the movable body cannot come into contact with the wound, avoiding it from sticking to the wound and causing large-area stinging pain. Moreover, the movable shell with the bulge in the middle can protect the wound area, preventing it from causing severe pain or affecting the scab formation before the wound scabs over.

[0016] By removing the movable part located at the edge and reinstalling it, the shape of the movable shell can be changed to fit the shape of the wound. Alternatively, the size of the movable shell can be changed by directly removing the movable part located at the edge, thus fitting the size of the wound and making it more flexible to use. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure in an embodiment of this disclosure.

[0018] Figure 2 This is a schematic diagram of the structure after the moving body is moved in an embodiment of this disclosure.

[0019] Figure 3 This is a schematic diagram of the structure of multiple moving bodies in the embodiments of this disclosure.

[0020] Figure 4 This is a schematic diagram of a single moving body structure in an embodiment of this disclosure.

[0021] Figure 5 This is a cross-sectional view of the active body in an embodiment of this disclosure.

[0022] Figure 6 In the embodiments of this disclosure Figure 5 Enlarged diagram of point A in the diagram.

[0023] Figure 7 In the embodiments of this disclosure Figure 5 Enlarged diagram of point B in the image.

[0024] Figure 8 This is a schematic diagram of the cooperation between the slider and the groove in an embodiment of this disclosure.

[0025] Figure 9 In the embodiments of this disclosure Figure 8 Enlarged diagram of point C in the image.

[0026] Figure 10 This is a cross-sectional view of the cylinder block in an embodiment of this disclosure.

[0027] Figure 11 This is a cross-sectional view of the telescopic rod in an embodiment of this disclosure.

[0028] Reference numerals: movable housing 1, movable body 11, slide groove 111, receiving groove 101, slide bar 112, toothed groove 1121, first sealing strip 113, second sealing strip 114, third sealing strip 115, suction tube 12, locking element 13, locking block 131, first spring 132, telescopic rod 133, fixed cylinder 1331, first piston head 1332, second movable rod 1333, first branch pipe 134, second branch pipe 135, connector pipe 136, pipe 14, control component 2, cylinder 21, piston head 22, first movable rod 23, mushroom head 24, second spring 25. Detailed Implementation

[0029] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0030] Example 1, referring to Figures 1-4 This embodiment provides a burn and plastic surgery wound cleaning and healing device, including a movable shell 1, which is formed by splicing multiple movable bodies 11. The movable bodies 11 have grooves 111 on their edges. Sliding strips 112 are fixedly connected to the edges of the movable bodies 11 that are symmetrical to the grooves 111. The sliding strips 112 of adjacent movable bodies 11 are slidably connected to the inner wall of the grooves 111. One end of a suction tube 12 is fixedly connected to the axial position of the movable body 11, and the other end of the suction tube 12 is fixedly connected to a negative pressure pump.

[0031] Preferably, in this embodiment, the slide bar 112 can slide on the inner wall of the groove 111. The slide bar 112 and the groove 111 cooperate with each movable body 11, allowing the movable bodies 11 to slide relatively longitudinally. Adjusting the height between the movable bodies 11 can change the shape of the entire movable shell 1. Pushing the movable body 11 in the middle upwards can cause the middle part of the movable shell 1 to bulge, forming an arched shell. In this way, the movable body 11 in the middle does not come into contact with the wound, avoiding it from adhering to the wound and causing large-area stinging pain. Moreover, the bulging movable shell 1 in the middle can protect the wound area, preventing severe pain or affecting scab formation due to contact with the wound before scab formation. The transverse cross-section of the movable body 11 can be square, rectangular, equilateral triangle, or regular hexagonal. Figure 1 The center is a regular hexagon.

[0032] Furthermore, refer to Figure 5 Each movable body 11 has a hollow pipe 14 in the middle. Normally, the pipe 14 is blocked. After removing the plug on the pipe 14, insert one end of the suction tube 12 into the pipe 14 to connect the suction tube 12 and the pipe 14. At this time, the existing negative pressure pump is started and begins to work. The negative pressure pump sucks away the exudate, necrotic tissue and bacteria from the wound through the suction tube 12 and the pipe 14.

[0033] Furthermore, since the various active components 11 can be connected to each other, refer to... Figure 1 and Figure 2 The movable shell 1, which is assembled from the movable parts 11, is rectangular. By removing the movable parts 11 located at the edge and reinstalling them, the shape of the movable shell 1 can be changed to adapt to the shape of the wound. Alternatively, the size of the movable shell 1 can also be changed by directly removing the movable parts 11 located at the edge, thereby adapting to the size of the wound and making it more flexible to use.

[0034] Furthermore, during use, the movable body 11 located in the middle is pushed upwards, causing the middle of the movable shell 1 to bulge out, forming an arched shell. The edge of the movable shell 1 is then attached to the skin at the edge of the wound using medical straps, elastic mesh sleeves, ring-shaped wrapping pieces, or binding dressing frames to fix the movable shell 1 in place. At this point, the negative pressure pump is activated and begins to work. The negative pressure pump sucks away the exudate, necrotic tissue, and bacteria from the wound through the suction tube 12 and pipe 14, thereby promoting the growth of granulation tissue and creating favorable conditions for subsequent skin grafting or flap repair surgery.

[0035] Example 2, refer to Figures 1-11 This embodiment is based on the previous embodiment, but differs from the previous embodiment in that...

[0036] Reference Figure 4 A first sealing strip 113 is installed on the top of the movable body 11, the top of the inner wall of the slide groove 111, and the top of the slide bar 112. A second sealing strip 114 is installed on the bottom of the movable body 11, the bottom of the inner wall of the slide groove 111, and the bottom of the slide bar 112.

[0037] Preferably, in this embodiment, the first sealing strip 113 can seal the top of the inner wall of the groove 111 of one of the movable bodies 11 and the top of the slide bar 112 of the adjacent movable body 11, and the second sealing strip 114 can seal the bottom of the inner wall of the groove 111 of one of the movable bodies 11 and the bottom of the slide bar 112 of the adjacent movable body 11. This is equivalent to sealing the top and bottom walls of the movable body 11 respectively. (Refer to...) Figure 2 When one of the movable bodies 11 is not in contact with the top and bottom of the adjacent movable body 11, the first sealing strip 113 at the top of the movable body 11 can still maintain the sealing effect, thereby ensuring the sealing performance when the movable body 11 slides longitudinally.

[0038] Reference Figure 4 The side walls of the movable bodies 11 on both sides of the slide groove 111 and the slide bar 112 are respectively provided with third sealing strips 115.

[0039] In this embodiment, the third sealing strip 115 preferably seals the sidewalls of the movable body 11 on both sides of the slide groove 111 and the slide strip 112, thereby improving the sealing effect of the sidewalls of the movable body 11.

[0040] Reference Figure 5 The slide bar 112 has a toothed groove 1121, and the inner wall of the slide groove 111 is provided with a plurality of locking elements 13. The locking elements 13 are used to engage with the toothed groove 1121 to lock the relative position of adjacent moving bodies 11.

[0041] Preferably, in this embodiment, the locking member 13 engages with the toothed groove 1121 to lock the relative positions of adjacent movable bodies 11. Pushing the movable body 11 located in the middle upwards causes the middle part of the movable housing 1 to bulge, forming an arched shell. The locking member 13 then engages with the toothed groove 1121 to lock the relative positions of adjacent movable bodies 11. At this time, the movable housing 1 forms a hard shell. The bulging movable housing 1 in the middle can protect the wound area, preventing severe pain or interference with scab formation due to touching the wound area before scab formation.

[0042] Reference Figure 5 and Figure 6 The locking component 13 includes a locking block 131 and a first spring 132. The inner wall of the slide groove 111 is provided with a receiving groove 101. The inner wall of the receiving groove 101 is slidably connected to the locking block 131. One side of the locking block 131 is provided with teeth and engages with the tooth groove 1121. The other side of the locking block 131 is fixedly connected to one end of the first spring 132. The first spring 132 is fixedly connected to the inner end wall of the receiving groove 101.

[0043] In this preferred embodiment, the locking block 131 is pushed to move under the action of the first spring 132. At this time, the locking block 131 engages with the connecting groove 1121, which can lock the relative position of the adjacent moving body 11.

[0044] Reference Figure 5 and Figure 6 The locking block 131 is fixedly connected to one end of the telescopic rod 133, and the other end of the telescopic rod 133 is fixedly connected to the inner end wall of the receiving groove 101. The telescopic rod 133 is connected to the second branch pipe 135 through the first branch pipe 134.

[0045] In this preferred embodiment, when the telescopic rod 133 retracts, the telescopic rod 133 drives the locking block 131 to move, the locking block 131 disengages from the tooth groove 1121, and releases the locking of the relative position of the adjacent moving body 11. At this time, the adjacent moving body 11 can move.

[0046] Reference Figure 6 and Figure 7 The second branch pipe 135 is fixedly connected to the insertion movable body 11 at one end, and the other end of the second branch pipe 135 is connected to the connector pipe 136, which is connected to the control component 2.

[0047] In this preferred embodiment, the contraction or extension of the telescopic rod 133 can be controlled by the control component 2.

[0048] Reference Figure 10 The control component 2 includes a cylinder 21, a piston head 22, a first movable rod 23, and a mushroom head 24. The bottom of the cylinder 21 is connected to a connector pipe 136. The piston head 22 is slidably connected to the inner wall of the cylinder 21. One end of the first movable rod 23 is fixedly connected to the top of the piston head 22. The first movable rod 23 passes through the top of the cylinder 21, and the top of the first movable rod 23 is fixedly connected to the mushroom head 24.

[0049] In this preferred embodiment, when the mushroom head 24 is pressed down, the mushroom head 24 drives the first movable rod 23 and the piston head 22 to move towards... Figure 10 When the cylinder moves downwards, the gas inside the cylinder 21 acts on the telescopic rod 133 through the connector pipe 136, the second branch pipe 135 and the first branch pipe 134.

[0050] Reference Figure 10 One end of the second spring 25 is fixedly connected to the bottom wall of the cylinder 21, and the other end of the second spring 25 is fixedly connected to the piston head 22.

[0051] In this preferred embodiment, when the mushroom head 24 is not pressed down, the second spring 25 pushes the piston head 22 upward under the action of elastic force, so that the piston head 22 returns to the initial position.

[0052] Reference Figure 11 The telescopic rod 133 includes a fixed cylinder 1331, a first piston head 1332, and a second movable rod 1333. The bottom of the fixed cylinder 1331 is fixedly connected to the inner wall of the receiving groove 101, and the inner wall of the fixed cylinder 1331 is slidably connected to the first piston head 1332. The first piston head 1332 is fixedly connected to one end of the second movable rod 1333, and the other end of the second movable rod 1333 is fixedly connected to the locking block 131.

[0053] In this preferred embodiment, when the mushroom head 24 is pressed down, the mushroom head 24 drives the first movable rod 23 and the piston head 22 to move towards... Figure 10 When the cylinder moves downwards, the gas inside the cylinder 21 acts on the fixed cylinder 1331 of the telescopic rod 133 through the connector pipe 136, the second branch pipe 135 and the first branch pipe 134. The gas pushes the first piston head 1332 to move. The first piston head 1332 drives the second movable rod 1333 to retract into the fixed cylinder 1331. At this time, the telescopic rod 133 retracts. When the telescopic rod 133 retracts, it drives the locking block 131 to move. The locking block 131 disengages from the tooth groove 1121, releasing the locking of the relative position of the adjacent movable body 11. At this time, the adjacent movable body 11 can move.

[0054] When the mushroom head 24 is not pressed down, the second spring 25, under the action of elastic force, pushes the piston head 22 upward, causing the piston head 22 to return to its initial position. At this time, the gas inside the fixed cylinder 1331 of the telescopic rod 133 returns to the cylinder body 21 through the first branch pipe 134, the second branch pipe 135, and the connector pipe 136. At this time, the first piston head 1332 moves upward. Figure 11 When the piston moves to the left, the first piston head 1332 drives the second movable rod 1333 to extend out of the fixed cylinder 1331, and the telescopic rod 133 extends as a whole. Under the action of the telescopic rod 133 and the first spring 132, the locking block 131 moves. At this time, the locking block 131 engages with the connecting groove 1121, which can lock the relative position of the adjacent movable body 11. When the mushroom head 24 is not pressed down, the relative position of the adjacent movable body 11 is locked. At this time, the movable housing 1 forms a rigid shell, and there is no need to apply force to the mushroom head 24 at all times. Moreover, at this time, the connector tube 136 is removed, and the connection between the movable housing 1 and the control component 2 is disconnected. At this time, under the action of the first spring 132, the locking block 131 still engages with the connecting groove 1121, locking the relative position of the adjacent movable body 11. After the shape of the movable housing 1 is adjusted, the connector tube 136 is removed, and the connection between the movable housing 1 and the control component 2 is disconnected. The injured person does not need to carry the control component 2 with them, so as to avoid affecting the injured person's movement.

[0055] In use, first press down the mushroom head 24. The mushroom head 24 drives the first moving rod 23 and the piston head 22 to move towards... Figure 10 As the cylinder moves downwards, the gas inside the cylinder 21 acts on the fixed cylinder 1331 of the telescopic rod 133 through the connector pipe 136, the second branch pipe 135, and the first branch pipe 134. The gas pushes the first piston head 1332 to move, and the first piston head 1332 drives the second movable rod 1333 to retract into the fixed cylinder 1331. At this time, the telescopic rod 133 retracts. When the telescopic rod 133 retracts, it drives the locking block 131 to move, and the locking block 131 disengages from the tooth groove 1121, releasing the adjacent movable body 11. The relative position is locked, at which point the adjacent movable body 11 can move. The movable body 11 located in the middle is pushed upward, causing the middle part of the movable housing 1 to bulge, forming an arched shell. Then the downward pressure of the mushroom head 24 stops, and the second spring 25, under the action of elastic force, pushes the piston head 22 upward, causing the piston head 22 to return to the initial position. At this time, the gas inside the fixed cylinder 1331 of the telescopic rod 133 returns to the cylinder body 21 through the first branch pipe 134, the second branch pipe 135, and the connector pipe 136. At this time, the first piston head 1332 moves towards... Figure 11When the piston moves to the left, the first piston head 1332 drives the second movable rod 1333 to extend out of the fixed cylinder 1331, and the telescopic rod 133 extends as a whole. Under the action of the telescopic rod 133 and the first spring 132, the locking block 131 moves. At this time, the locking block 131 engages with the tooth groove 1121, which can lock the relative position of the adjacent movable bodies 11. At this time, the movable shell 1 forms a hard shell. The movable shell 1 with a protrusion in the middle can protect the wound and prevent severe pain or affect the scab formation due to touching the wound before the wound scabs.

[0056] Then, the edge of the movable shell 1 is attached to the skin at the edge of the wound using medical bandages, elastic netting, ring wrapping, or binding dressing frame to fix the movable shell 1. At this time, the negative pressure pump is started to work. The negative pressure pump sucks away the exudate, necrotic tissue and bacteria at the wound through the suction tube 12 and pipe 14, thereby promoting the growth of granulation tissue and creating favorable conditions for subsequent skin grafting or flap repair surgery.

Claims

1. A device for debridement and healing promotion of burn and plastic surgery wounds, characterized in that: The device includes a movable housing (1), which is formed by splicing multiple movable bodies (11). The movable body (11) has a groove (111) on its edge. A slide bar (112) is fixedly connected to the edge of the movable body (11) that is symmetrical to the groove (111). The slide bars (112) of adjacent movable bodies (11) are slidably connected to the inner wall of the groove (111). One end of the suction tube (12) is fixedly connected to the axial position of the movable body (11), and the other end of the suction tube (12) is fixedly connected to the negative pressure pump.

2. The burn and plastic surgery wound debridement and healing promotion device as described in claim 1, characterized in that: A first sealing strip (113) is installed on the top of the movable body (11), the top of the inner wall of the slide groove (111), and the top of the slide bar (112). A second sealing strip (114) is installed on the bottom of the movable body (11), the bottom of the inner wall of the slide groove (111), and the bottom of the slide bar (112).

3. The burn and plastic surgery wound debridement and healing promotion device as described in claim 1, characterized in that: The movable body (11) sidewalls on both sides of the slide groove (111) and slide bar (112) are respectively provided with a third sealing strip (115).

4. The burn and plastic surgery wound debridement and healing promotion device as described in claim 1, characterized in that: The slide bar (112) has a toothed groove (1121), and the inner wall of the slide groove (111) is provided with a plurality of locking elements (13). The locking elements (13) are used to engage with the toothed groove (1121) to lock the relative position of adjacent moving bodies (11).

5. The burn and plastic surgery wound debridement and healing promotion device as described in claim 4, characterized in that: The locking component (13) includes a locking block (131) and a first spring (132). The inner wall of the slide groove (111) is provided with a receiving groove (101). The inner wall of the receiving groove (101) is slidably connected to the locking block (131). One side of the locking block (131) is provided with teeth and engages with the tooth groove (1121). The other side of the locking block (131) is fixedly connected to one end of the first spring (132). The first spring (132) is fixedly connected to the inner end wall of the receiving groove (101).

6. The burn and plastic surgery wound debridement and healing promotion device as described in claim 5, characterized in that: The card block (131) is fixedly connected to one end of the telescopic rod (133), and the other end of the telescopic rod (133) is fixedly connected to the inner end wall of the receiving groove (101). The telescopic rod (133) is connected to the second branch pipe (135) through the first branch pipe (134).

7. The burn and plastic surgery wound debridement and healing promotion device as described in claim 6, characterized in that: One end of the second branch pipe (135) is fixedly connected to the insertion movable body (11), and the other end of the second branch pipe (135) is connected to the connector pipe (136), which is connected to the control component (2).

8. The burn and plastic surgery wound debridement and healing promotion device as described in claim 7, characterized in that: The control component (2) includes a cylinder (21), a piston head (22), a first movable rod (23), and a mushroom head (24). The bottom of the cylinder (21) is connected to a connector pipe (136). The piston head (22) is slidably connected to the inner wall of the cylinder (21). One end of the first movable rod (23) is fixedly connected to the top of the piston head (22). The first movable rod (23) passes through the top of the cylinder (21), and the top of the first movable rod (23) is fixedly connected to the mushroom head (24).

9. The burn and plastic surgery wound debridement and healing promotion device as described in claim 8, characterized in that: The bottom wall of the cylinder (21) is fixedly connected to one end of the second spring (25), and the other end of the second spring (25) is fixedly connected to the piston head (22).

10. The burn and plastic surgery wound debridement and healing promotion device as described in claim 6, characterized in that: The telescopic rod (133) includes a fixed cylinder (1331), a first piston head (1332), and a second movable rod (1333). The bottom of the fixed cylinder (1331) is fixedly connected to the inner wall of the receiving groove (101). The inner wall of the fixed cylinder (1331) is slidably connected to the first piston head (1332). The first piston head (1332) is fixedly connected to one end of the second movable rod (1333), and the other end of the second movable rod (1333) is fixedly connected to the locking block (131).

Images