Vertebral body dilator

Abstract

The invention relates to the technical field of medical instruments, in particular to a vertebral fracture reduction spreader which comprises a connector, a spreading structure, a traction structure, a limiting structure, a connecting seat, a pressurizing structure and a filtering structure. The volume of the distraction structure can be reduced through the traction structure when the distraction structure is taken out, so that the distraction structure can be conveniently taken out, liquid entering the distraction structure can be filtered through the filtering structure, and the liquid can be filtered out through the filtering structure; and large-particle impurities are prevented from entering the opening structure to block the opening structure, so that the use convenience, stability and safety are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, in particular to a vertebral fracture reduction and distraction device. Background Art

[0002] The vertebral fracture reduction and distraction device is used as an auxiliary reduction device during surgery for vertebral compression fractures, vertebral collapse, height loss caused by burst fractures, etc. It enters the vertebral body through the pedicle channel to distract and reduce the fracture and thus restore the vertebral height. After removing the distraction device, bone grafting is performed through the pedicle channel to maintain the vertebral height and ultimately achieve the purpose of fracture healing.

[0003] However, the support plates of traditional vertebral spacers are arc-shaped structures with high height in the middle and small height on both sides. Therefore, the contact area with the vertebral body is small during expansion, and a cutting effect is easily generated. It is also difficult to restore the overall height of the vertebral body, and it is unable to provide uniform and stable support and reduction for vertebral fractures. Summary of the Invention

[0004] In view of the problems in the prior art, the present invention provides a vertebral fracture reduction and distraction device.

[0005] The technical solution adopted by the present invention to solve the technical problem is: a vertebral fracture reduction and distraction device includes a connecting head, a distraction structure is provided on the connecting head, a pulling structure is provided on the connecting head, a limiting structure is provided on the pulling structure, a connecting seat is provided on the distraction structure, a pressurizing structure is provided on the connecting seat, and a filtering structure is provided on the distraction structure;

[0006] The support structure includes a memory alloy sheet and a support plate. Two memory alloy sheets are fixedly connected to both sides of the connecting head. One end of two memory alloy sheets located on the same side of the connecting head is fixedly connected to the same support plate. The outer sleeve of the memory alloy sheet is provided with a corrugated sleeve, one end of the corrugated sleeve is fixedly connected to the support plate, and the other end of the corrugated sleeve is fixedly connected to the connecting head. A circulation flow channel is provided inside the connecting head, and one end of the connecting head is fixedly connected to two connecting pipes, one end of one of the connecting pipes is fixedly connected to a first hose, the end of the first hose is fixedly connected to a water pump, a second hose is fixedly connected to the water pump, and the two connecting pipes are fixedly connected to the same connecting seat.

[0007] Specifically, the two support plates are distributed in a circular array about the center of the connector, and the cross-section of the support plates is a rectangular structure.

[0008] Specifically, the boosting structure includes a piston rod and a second spring. The piston rod is slidably connected to the connecting seat. The second spring is sleeved on the outside of the piston rod. One end of the second spring is fixedly connected to the piston rod, and the other end of the second spring is fixedly connected to the connecting seat. The connecting seat is provided with an opening, and a third hose is fixedly connected to the connecting seat.

[0009] Specifically, a sealing ring is engaged on the outer side of the piston rod, and the sealing ring is slidably connected to the connecting seat.

[0010] Specifically, the filtering structure includes a connecting sleeve and a filter screen. One end of the second hose is fixedly connected to the connecting sleeve. The filter screen is clamped on the connecting sleeve. The connecting sleeve is threadedly connected to a fixing sleeve. The fixing sleeve and the filter screen are in conflict.

[0011] Specifically, a plurality of protrusions are fixedly connected to the outer side of the fixing sleeve, and the plurality of protrusions are distributed in a circular array about the middle part of the fixing sleeve. The cross section of the entire filter screen is a U-shaped structure.

[0012] Specifically, the pulling structure includes a pull rope and a slider, the internal sliding connection of the connecting head is connected to the slider, the internal sliding connection of the connecting head is connected to two pull ropes, one end of one of the pull ropes is fixedly connected to one of the support plates, and one end of the other pull rope is fixedly connected to the other support plate, the other ends of the two pull ropes are fixedly connected to the slider, an elastic band is fixedly connected to the slider, the elastic band is fixedly connected to the slide, the two connecting tubes are fixedly connected to the same connecting frame, and the slide is slidably connected to the connecting frame.

[0013] Specifically, both sides of the slide are fixedly connected with handles, and a limiting structure is provided on the slide.

[0014] Specifically, the limiting structure includes a clamping block and a first spring. The interior of the sliding seat is slidably connected to the clamping block, and one end of the clamping block is engaged with the connecting frame.

[0015] Specifically, a first spring is provided inside the slide, one end of the first spring abuts against the block, and the other end of the first spring abuts against the slide, the cross-section of the block near one end of the connecting frame is a trapezoidal structure, and the cross-section of the block as a whole is a T-shaped structure.

[0016] The beneficial effects of the present invention are:

[0017] (1) The vertebral body spacer described in the present invention can achieve uniform and stable support of the vertebral body through the expansion structure, thereby improving the reduction effect of the fractured vertebral body.

[0018] (2) The vertebral body spacer of the present invention can reduce the volume of the spacer structure when removing the spacer structure through the pulling structure, thereby facilitating the removal of the spacer structure.

[0019] (3) The vertebral body spacer described in the present invention can filter the water entering the interior of the spacer through the filtering structure, thereby preventing large particles of impurities from entering the interior of the spacer and causing blockage of the spacer, thereby improving the convenience and stability of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below with reference to the accompanying drawings and examples.

[0021] Figure 1 A schematic structural diagram of the overall structure of a preferred embodiment of the vertebral body spacer provided by the present invention;

[0022] Figure 2 for Figure 1 An enlarged schematic diagram of part A is shown;

[0023] Figure 3 This is a schematic diagram of the connection structure between the connecting pipe and the connecting seat of the present invention;

[0024] Figure 4 for Figure 3 An enlarged schematic diagram of part B is shown;

[0025] Figure 5 for Figure 3 An enlarged schematic diagram of section C is shown;

[0026] Figure 6 for Figure 3 An enlarged schematic diagram of portion D is shown;

[0027] Figure 7 This is a schematic diagram of the connection structure between the circulation channel and the connector of the present invention;

[0028] Figure 8 for Figure 7 An enlarged schematic diagram of part E is shown.

[0029] In the figure: 1. Connector; 2. Support structure; 201. Memory alloy sheet; 202. Support plate; 203. Corrugated sleeve; 204. Circulation channel; 205. Connecting pipe; 206. First hose; 207. Water pump; 208. Second hose; 3. Pulling structure; 301. Pull rope; 302. Slider; 303. Elastic band; 304. Sliding seat; 305. Connecting frame; 306. Handle; 4. Limiting structure; 401. Block; 402. First spring; 5. Connecting seat; 6. Pressurizing structure; 601. Piston rod; 602. Second spring; 603. Sealing ring; 604. Opening; 605. Third hose; 7. Filtering structure; 701. Connecting sleeve; 702. Filter net; 703. Fixing sleeve; 704. Bump. DETAILED DESCRIPTION

[0030] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0031] like Figure 1 、 Figure 2 、 Figure 2 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 and Figure 8 As shown, the vertebral body spacer of the present invention includes a connecting head 1, a spreading structure 2 is provided on the connecting head 1, a pulling structure 3 is provided on the connecting head 1, a limiting structure 4 is provided on the pulling structure 3, a connecting seat 5 is provided on the spreading structure 2, a boosting structure 6 is provided on the connecting seat 5, and a filtering structure 7 is provided on the spreading structure 2;

[0032] like Figure 1 、 Figure 3 、 Figure 4 、 Figure 7 and Figure 8As shown, the support structure 2 includes a memory alloy sheet 201 and a support plate 202. Two memory alloy sheets 201 are fixedly connected to both sides of the connector 1. One end of the two memory alloy sheets 201 located on the same side of the connector 1 is fixedly connected to the same support plate 202. The outer sleeve of the memory alloy sheet 201 is provided with a corrugated sleeve 203. One end of the corrugated sleeve 203 is fixedly connected to the support plate 202, and the other end of the corrugated sleeve 203 is fixedly connected to the connector 1. A circulation channel 204 is provided inside the connector 1. One end of the connector 1 is fixedly connected to two connecting pipes 205, one end of which is fixedly connected to a first hose 206. The end of the first hose 206 is fixedly connected to the water pump 20 7. The water pump 207 is fixedly connected to a second hose 208. The two connecting pipes 205 are fixedly connected to the same connecting seat 5. The two support plates 202 are distributed in a circular array about the center of the connector 1. The cross-section of the support plate 202 is a rectangular structure. The booster structure 6 includes a piston rod 601 and a second spring 602. The piston rod 601 is slidably connected to the connecting seat 5. The outer sleeve of the piston rod 601 is provided with a second spring 602. One end of the second spring 602 is fixedly connected to the piston rod 601, and the other end of the second spring 602 is fixedly connected to the connecting seat 5. The connecting seat 5 is provided with an opening 604. The connecting seat 5 is fixedly connected to a third hose 605. The outer side of the piston rod 601 is engaged with The sealing ring 603 is slidably connected to the connecting seat 5, that is, when the vertebral body needs to be expanded, the connector 1 can be placed in ice water for a period of time. At this time, the temperature of the memory alloy sheet 201 will drop. Since the memory alloy has the characteristics of softening at low temperature and returning to its initial state after the temperature rises, the memory alloy sheet 201 can compress the two support plates 202 after the temperature drops to reduce the distance between the two support plates 202. At this time, it is convenient to place the connector 1 between the vertebral bodies. After the connector 1 is placed between the vertebral bodies, one end of the second hose 208 can be placed in hot water, and then the water pump 207 can be started. Under the action of the water pump 207, hot water will enter the inside of the first hose 206, and then from the inside of the first hose 206 The hot water enters the interior of one of the connecting pipes 205, and then enters the interior of the circulation channel 204 from the interior of one of the connecting pipes 205, and flows from the circulation channel 204 into the interior of the other connecting pipe 205. During the flow of the hot water in the circulation channel 204, it contacts the multiple memory alloy sheets 201, so that the temperature of the memory alloy sheets 201 gradually increases. During the flow, the hot water contacts the ends of the piston rod 601. At this time, the water pressure in the circulation channel 204 increases, so that the hot water flows into the interior of the bellows sleeve 203, thereby increasing the contact area between the hot water and the memory alloy sheets 201, which is convenient for increasing the speed at which the memory alloy sheets 201 heat up. As the water pressure increases, the piston rod 601 slides on the connecting seat 5.As the second spring 602 stretches, the movement of the piston rod 601 drives the sealing ring 603 to slide inside the connecting seat 5. The sealing ring 603 can improve the sealing between the piston rod 601 and the connecting seat 5. As the piston rod 601 moves, it will not seal the opening 604. At this time, water will flow out from the opening 604, thereby keeping the water pressure inside the circulation channel 204 at a stable state. The water flowing out from the opening 604 will enter the interior of the third hose 605 and eventually flow out from the end of the third hose 605. At this time, it is only necessary to place the end of the third hose 605 inside the hot water tank to realize the circulation of hot water, thereby ensuring that the water temperature inside the circulation channel 204 is at a stable state. In a stable state, as the hot water circulation time increases, the temperature of the memory alloy sheet 201 will rise to above the critical value of its deformation. At this time, the four memory alloy sheets 201 will stretch simultaneously. Two of the memory alloy sheets 201 will drive one of the support plates 202 to move during the stretching process, and the other two memory alloy sheets 201 will drive the other two support plates 202 to move during the stretching process, thereby increasing the distance between the two support plates 202. The two support plates 202 can achieve the work of expanding the vertebral body during the process of moving away from each other. Because the cross-section of the support plate 202 is a rectangular structure, it can increase the contact area between the vertebral body and the vertebral body, thereby forming a stable support for the vertebral body and improving the vertebral body support effect.

[0033] Specifically, such as Figure 3 and Figure 6 As shown, the filtering structure 7 includes a connecting sleeve 701 and a filter screen 702. One end of the second hose 208 is fixedly connected to the connecting sleeve 701. The filter screen 702 is engaged with the connecting sleeve 701. The connecting sleeve 701 is threadedly connected to a fixing sleeve 703. The fixing sleeve 703 and the filter screen 702 are in conflict with each other. The outer side of the fixing sleeve 703 is fixedly connected to a plurality of protrusions 704. The plurality of protrusions 704 are distributed in a circular array about the middle of the fixing sleeve 703. The cross-section of the filter screen 702 is a U-shaped structure. That is, before the water enters the second hose 208, the large particles of impurities in the water will be filtered out by the filter screen 702. Filtering is performed, thereby preventing large particles of impurities from entering the inner part of the connecting pipe 205 and the circulation channel 204, avoiding clogging of the water circulation system, thereby effectively improving the stability of use, and when the filter screen 702 needs to be cleaned, it can be done by rotating the fixing sleeve 703. During the rotation of the fixing sleeve 703, multiple protrusions 704 can be used to prevent the hand from slipping. When the fixing sleeve 703 is twisted off from the connecting sleeve 701, it will not resist the filter screen 702, and then the filter screen 702 can be taken out from the inside of the connecting sleeve 701. After the filter screen 702 is removed, it is convenient to clean it comprehensively, thereby ensuring the filtering effect.

[0034] Specifically, such as Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5 As shown, the pulling structure 3 includes a pull rope 301 and a slider 302. The slider 302 is slidably connected to the interior of the connector 1. The connector 1 is slidably connected to two pull ropes 301. One end of one of the pull ropes 301 is fixedly connected to one of the support plates 202, and one end of the other pull rope 301 is fixedly connected to the other support plate 202. The other ends of the two pull ropes 301 are fixedly connected to the slider 302. The slider 302 is fixedly connected to an elastic band 303. The elastic band 303 is fixedly connected to the slide seat 304. The two connecting tubes 205 The same connecting frame 305 is fixedly connected between them, the slide 304 is slidably connected to the connecting frame 305, and the two sides of the slide 304 are fixedly connected to the handle 306. A limiting structure 4 is provided on the slide 304, and the limiting structure 4 includes a block 401 and a first spring 402. The inside of the slide 304 is slidably connected to the block 401, and one end of the block 401 is engaged with the connecting frame 305. A first spring 402 is provided inside the slide 304, and one end of the first spring 402 abuts against the block 401, and the other end of the first spring 402 abuts against the slide 30 4. The cross section of the clamping block 401 near one end of the connecting frame 305 is a trapezoidal structure, and the cross section of the clamping block 401 as a whole is a T-shaped structure, that is: when the operation is completed and the vertebral body does not need to be supported, cold water can be circulated into the internal circulation channel 204 to reduce the temperature of the multiple memory alloy sheets 201. After the temperature of the memory alloy sheets 201 is reduced, they will become soft, and then the slide 304 can be pulled by the handheld handle 306. The slide 304 will drive the elastic band 303 to move, the elastic band 303 will drive the slider 302 to move, and the slider 302 will drive the two pull ropes 301 to move. The movement of 301 will pull the support plate 202 to move it toward the connecting head 1. As the slide 304 continues to move, the first spring 402 will stretch and drive the block 401 to engage with the connecting frame 305. At this time, the slide 304 cannot be pulled any further. At the same time, the distance between the two support plates 202 becomes smaller, making it convenient to remove the expander. In the process of expanding the vertebral body, if you forget to release the limit of the block 401 on the slide 304, the elastic band 303 will stretch after being pulled. Therefore, it can prevent the memory alloy sheet 201 from being damaged by greater resistance during the stretching process, thereby improving the safety of use.

[0035] When the present invention is in use, when the vertebral body needs to be expanded, the connector 1 can be placed in ice water for a period of time. At this time, the temperature of the memory alloy sheet 201 will drop. Since the memory alloy has the characteristics of softening at low temperatures and returning to its initial state after the temperature rises, the memory alloy sheet 201 can compress the two support plates 202 after the temperature drops to reduce the distance between the two support plates 202. At this time, it is convenient to place the connector 1 between the vertebral bodies. After the connector 1 is placed between the vertebral bodies, one end of the second hose 208 can be placed in hot water, and then the water pump 207 can be started. Under the action of the water pump 207, the hot water will enter the interior of the first hose 206. Before the water enters the second hose 208, it will pass through the filter 702 to filter the large amount of water in the water. The particulate impurities are filtered, thereby preventing large particulate impurities from entering the inner part of the connecting pipe 205 and the circulation channel 204, avoiding clogging of the water circulation system, thereby effectively improving the stability of use. The water flowing out of the first hose 206 will enter the inner part of one of the connecting pipes 205, and then enter the inner part of the circulation channel 204 from the inner part of one of the connecting pipes 205, and flow from the circulation channel 204 into the inner part of the other connecting pipe 205. During the flow of hot water in the circulation channel 204, it will contact with multiple memory alloy sheets 201, so that the temperature of the memory alloy sheets 201 gradually increases. During the flow, the hot water will contact between the ends of the piston rod 601. At this time, the water pressure inside the circulation channel 204 is reduced. The second spring 602 extends, and the movement of the piston rod 601 drives the sealing ring 603 to slide inside the connecting seat 5. The sealing ring 603 can improve the sealing performance between the piston rod 601 and the connecting seat 5. As the piston rod 601 moves, it will not seal the opening 604. At this time, water will flow out from the opening 604, so that the water pressure inside the circulation channel 204 is maintained at a stable state. The water flowing out of the opening 604 will enter the interior of the third hose 605 and finally The hot water flows out from the end of the third hose 605. At this time, it is only necessary to place the end of the third hose 605 inside the hot water tank to realize the circulation of hot water, thereby ensuring that the water temperature inside the circulation channel 204 is in a stable state. As the hot water circulation time increases, the temperature of the memory alloy sheet 201 will increase to a value higher than the critical value of its deformation. At this time, the four memory alloy sheets 201 will stretch at the same time, and two of the memory alloy sheets 201 will drive one of the support plates 202 to move during the stretching process, and the other two memory alloy sheets 201 will drive the other two support plates 202 to move during the stretching process, thereby increasing the distance between the two support plates 202. The two support plates 202 will achieve the work of expanding the vertebral body during the process of moving away from each other.Since the cross section of the support plate 202 is a rectangular structure, the contact area between the support plate 202 and the vertebral body can be increased, thereby forming a stable support for the vertebral body and improving the vertebral body support effect;

[0036] When the operation is over and the vertebral body does not need to be supported, cold water can be circulated into the circulation channel 204 to reduce the temperature of the multiple memory alloy sheets 201. After the temperature of the memory alloy sheets 201 is reduced, they will become soft. Then, the slide 304 can be pulled by the handheld handle 306, and the slide 304 will drive the elastic band 303 to move. The elastic band 303 will drive the slider 302 to move. The slider 302 will drive the two pull ropes 301 to move. The movement of the pull ropes 301 will pull the support plate 202 to move toward the connector 1. As the slide 304 continues to move, the first spring 402 will stretch and drive the block 401 to engage with the connecting frame 305. At this time, the slide 304 cannot be pulled any further. At the same time, the distance between the two support plates 202 becomes smaller, making it convenient to remove the expander. In the process of expanding the vertebral body, if you forget to release the limit of the slide 304 by the block 401, the elastic band 303 will stretch after being pulled. Therefore, it can prevent the memory alloy sheet 201 from being damaged by greater resistance during the extension process, thereby improving the safety of use.

[0037] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0038] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A vertebral body spacer, characterized in that: The invention comprises a connecting head (1), wherein the connecting head (1) is provided with an expansion structure (2), the connecting head (1) is provided with a pulling structure (3), the pulling structure (3) is provided with a limiting structure (4), the expansion structure (2) is provided with a connecting seat (5), the connecting seat (5) is provided with a pressurizing structure (6), and the expansion structure (2) is provided with a filtering structure (7); The support structure (2) comprises a memory alloy sheet (201) and a support plate (202); two memory alloy sheets (201) are fixedly connected to both sides of the connector (1); one end of the two memory alloy sheets (201) located on the same side of the connector (1) is fixedly connected to the same support plate (202); a corrugated sleeve (203) is provided on the outside of the memory alloy sheet (201); one end of the corrugated sleeve (203) is fixedly connected to the support plate (202); and the other end of the corrugated sleeve (203) is fixedly connected to the support plate (202). The connector (204) is fixedly connected to a connector (1), wherein a circulation flow channel (204) is provided inside the connector (1), and one end of the connector (1) is fixedly connected to two connecting pipes (205), wherein one end of one of the connecting pipes (205) is fixedly connected to a first hose (206), and the end of the first hose (206) is fixedly connected to a water pump (207), and the water pump (207) is fixedly connected to a second hose (208), and the two connecting pipes (205) are fixedly connected to the same connecting seat (5).

2. The vertebral body spacer according to claim 1, characterized in that: The two support plates (202) are distributed in a circular array about the center of the connector (1), and the cross-section of the support plates (202) is a rectangular structure.

3. The vertebral fracture reduction and distraction device according to claim 1, characterized in that: The boosting structure (6) includes a piston rod (601) and a second spring (602), the piston rod (601) is slidably connected to the connecting seat (5), the second spring (602) is sleeved on the outside of the piston rod (601), one end of the second spring (602) is fixedly connected to the piston rod (601), and the other end of the second spring (602) is fixedly connected to the connecting seat (5), the connecting seat (5) is provided with an opening (604), and the connecting seat (5) is fixedly connected to a third hose (605).

4. The vertebral fracture reduction and distraction device according to claim 3, characterized in that: A sealing ring (603) is engaged on the outer side of the piston rod (601), and the sealing ring (603) is slidably connected to the connecting seat (5).

5. The vertebral fracture reduction and distraction device according to claim 1, characterized in that: The filtering structure (7) comprises a connecting sleeve (701) and a filter screen (702); one end of the second hose (208) is fixedly connected to the connecting sleeve (701); the filter screen (702) is engaged with the connecting sleeve (701); a fixing sleeve (703) is threadedly connected to the connecting sleeve (701); and the fixing sleeve (703) and the filter screen (702) are in conflict with each other.

6. The vertebral fracture reduction and distraction device according to claim 5, characterized in that: A plurality of protrusions (704) are fixedly connected to the outer side of the fixing sleeve (703), and the plurality of protrusions (704) are distributed in a circular array about the middle of the fixing sleeve (703). The entire cross-section of the filter screen (702) is a U-shaped structure.

7. The vertebral fracture reduction and distraction device according to claim 1, characterized in that: The pulling structure (3) comprises a pull rope (301) and a slider (302), the interior of the connector (1) is slidably connected to the slider (302), the interior of the connector (1) is slidably connected to two pull ropes (301), one end of one of the pull ropes (301) is fixedly connected to one of the support plates (202), one end of the other pull rope (301) is fixedly connected to the other support plate (202), the other ends of the two pull ropes (301) are fixedly connected to the slider (302), an elastic band (303) is fixedly connected to the slider (302), the elastic band (303) is fixedly connected to the slide seat (304), the two connecting tubes (205) are fixedly connected to the same connecting frame (305), and the slide seat (304) is slidably connected to the connecting frame (305).

8. The vertebral fracture reduction and distraction device according to claim 7, characterized in that: Both of the slide seats (304) are fixedly connected with handles (306), and a limiting structure (4) is provided on the slide seat (304).

9. The vertebral fracture reduction and distraction device according to claim 7, characterized in that: The limiting structure (4) comprises a clamping block (401) and a first spring (402); the interior of the sliding seat (304) is slidably connected to the clamping block (401); one end of the clamping block (401) is engaged with the connecting frame (305).

10. The vertebral fracture reduction and distraction device according to claim 9, characterized in that: A first spring (402) is provided inside the slide (304), one end of the first spring (402) abuts against the clamping block (401), and the other end of the first spring (402) abuts against the slide (304). The cross section of the clamping block (401) near one end of the connecting frame (305) is a trapezoidal structure, and the cross section of the clamping block (401) as a whole is a T-shaped structure.

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