Post-implantation displacement prevention device for cardiac pacemaker

Abstract

The invention discloses an anti-displacement device after cardiac pacemaker implantation, and relates to the field of cardiac pacemaker postoperative protection, the anti-displacement device comprises a compression vest, an adjustable compression mechanism is arranged on the compression vest, the adjustable compression mechanism comprises an adhesive cloth, an air pressure bag and a zipper tape, the adhesive cloth is adhered to the compression vest, and the air pressure bag is arranged on the adhesive cloth. Two zipper belts are fixed to the adhesive cloth in the horizontal direction in a spaced mode, zippers are arranged on the zipper belts, the air pressure bag is located between the two zipper belts, zipper buckles are connected to the four corners of the air pressure bag, the zipper buckles are matched with the closest zippers in a sliding mode, and a weight pressing body is arranged in the air pressure bag. The weight compression body is compressed at the pacemaker implantation position of a patient through the bandage assembly, an air pressure cavity is formed between the inner wall and the outer wall of the air pressure bag, a miniature barometer is arranged on the air pressure bag, the detection end of the miniature barometer is inserted into the air pressure cavity, and the weight compression body is prevented from displacing or falling off in a wearing mode. Rapid recovery of the patient is facilitated.

Description

Technical Field

[0001] The present invention relates to post-operative protection of a cardiac pacemaker, and in particular to a device for preventing displacement after cardiac pacemaker implantation. Background Art

[0002] Currently, after permanent pacemaker implantation, patients are required to lie flat. The incision is covered with a sterile dressing and then compressed with a sandbag or commercially available salt bag for 4-6 hours. The patient is also required to stay in bed for 3-7 days, and the limb on the operated side is absolutely immobilized. After 24 hours, the patient can lie on the left side at 30 degrees. After 3 days, slight activities are allowed, but the upper limb on the operated side is restricted for less than 7 days to prevent bleeding or blood accumulation in the sac and electrode dislocation.

[0003] Patent: CN119523563A discloses a post-operative displacement prevention device for cardiac pacemaker implantation, which relates to the field of post-operative protection for cardiac pacemakers, including a compression vest, an adjustable compression mechanism provided on the compression vest, the adjustable compression mechanism including an adhesive cloth, an air pressure bag and a zipper tape, the adhesive cloth adhered to the compression vest, two zipper tapes fixed to the adhesive cloth at intervals in the horizontal direction, a zipper provided on the zipper tape, the air pressure bag is located between the two zipper tapes, zipper buckles are connected to the four corners of the air pressure bag, the zipper buckle is slidably adapted to the nearest zipper, a heavy object compression body is provided in the air pressure bag, the heavy object compression body is pressed tightly against the patient's pacemaker implantation position by a strap assembly, an air pressure cavity is formed between the inner and outer walls of the air pressure bag, a micro barometer is provided on the air pressure bag, a detection end of the micro barometer is inserted into the air pressure cavity, and the heavy object compression body is prevented from being displaced or falling off by wearing the bag, which is conducive to the patient's rapid recovery;

[0004] In the above technology, the zipper buckle is positioned by a locking pin and a locking cylinder after sliding on the outside of the zipper. This locking method requires the locking pin to penetrate the zipper tape. After long-term use, the locking pin is constantly inserted and inserted, which is easy to damage the zipper tape. In addition, the locking pin and the locking cylinder in the above technology are set separately. The locking pin part is easy to lose and easy to poke others. Improvements are needed. For this reason, we propose an anti-displacement device after pacemaker implantation. Summary of the Invention

[0005] Purpose of the invention: The purpose of the present invention is to provide an anti-displacement device after cardiac pacemaker implantation, so as to solve the problem in the prior art that when the zipper buckle is positioned by the locking pin and the locking cylinder, the locking pin repeatedly penetrates the zipper tape, causing it to be easily damaged, and the locking pin and the locking cylinder are set separately, which easily causes the locking pin to be lost and may injure others. At the same time, it ensures that the device can effectively prevent the displacement or falling off of the body due to pressure from heavy objects, thereby helping patients recover quickly.

[0006] Technical solution: A post-operative displacement prevention device for cardiac pacemaker implantation, comprising a compression vest and a strap assembly, wherein the compression vest is provided with an adjustable compression mechanism, the adjustable compression mechanism comprising an adhesive cloth, an air pressure bag, and a zipper tape, the adhesive cloth being adhered to the compression vest, two zipper tapes being fixed to the adhesive cloth at intervals in the horizontal direction, the zipper tape being provided with a zipper, the air pressure bag being located between the two zipper tapes, the air pressure bag and the zipper buckle being slidably adapted to fit over the nearest zipper;

[0007] A heavy object pressure body is provided in the air pressure bag, and the heavy object pressure body is pressed against the patient's pacemaker implantation position through the strap assembly. An air pressure cavity is formed between the inner wall and the outer wall of the air pressure bag. A micro barometer is provided on the air pressure bag, and a detection end of the micro barometer is inserted into the air pressure cavity.

[0008] Opposite sides of the two zipper tapes are integrally formed with thin cloth strips;

[0009] The outer wall of the zipper buckle is located in front of the thin cloth strip and is fixedly connected to a limiting plate. A notch is provided on the rear surface of the limiting plate. A cylinder is provided on the inner side of the notch. The front end of the cylinder passes through the front of the limiting plate and is fixedly connected to a knob. The rear end of the cylinder is located behind the thin cloth strip and is fixedly connected to a clamping disk. The front surface of the clamping disk is located on the outside of the cylinder and is connected to a connecting ring through transfer rotation. The connecting ring is fixedly connected to a spring 1 on the opposite side of the notch and located on the outside of the cylinder. The thin cloth strip is clamped between the limiting plate and the clamping disk.

[0010] Furthermore, two magic plush belts are fixed on the upper and lower parts of the compression vest, and a magic hook-shaped surface is provided on the adhesive cloth, and the magic hook-shaped surface is magically adhered to the magic plush belts.

[0011] Furthermore, the strap assembly includes a transverse strap, one end of which is fixedly connected to one side of the compression vest, and a first mesh buckle is fixed to the other side of the compression vest, and the end of the transverse strap away from the compression vest is wrapped around the first mesh buckle.

[0012] Furthermore, the strap assembly also includes a longitudinal strap, one end of which is fixedly connected to the compression vest, and a second mesh buckle is provided on the compression vest. The end of the longitudinal strap away from the compression vest is wrapped around the second mesh buckle, and the transverse strap and the longitudinal strap are staggered to squeeze the air pressure bag.

[0013] Furthermore, the air pressure bag is provided with an inflation valve nozzle.

[0014] Furthermore, a first annular belt is fixed on the air pressure bag, the transverse strap passes through the first annular belt to connect to the first mesh buckle, a second annular belt is fixed on the transverse strap, and the longitudinal strap passes through the second annular belt to connect to the second mesh buckle.

[0015] Furthermore, a limiting hole is provided on the front surface of the clamping plate and behind the thin cloth strip, a contraction cavity is provided inside the limiting plate, the interior of the contraction cavity is slidably connected to a limiting column, a spring 2 is fixedly connected between the limiting column and the contraction cavity, the rear end of the limiting column is inserted into the interior of the limiting hole, and a conical head is integrally formed therein.

[0016] Furthermore, a hydraulic chamber is provided on the side of the limit plate away from the contraction chamber, and a piston plate is slidably connected to the inside of the hydraulic chamber. An abutment column is fixedly connected to the upper surface of the piston plate, and the top end of the abutment column passes through the front of the limit plate and contacts the rear surface of the knob. A hydraulic pipe is fixedly connected between the hydraulic chamber and the air pressure chamber.

[0017] Beneficial effects: The compression vest is worn on the patient, and the heavy compression body compresses the patient's pacemaker implantation site, preventing the heavy compression body from displacement or falling off by wearing the vest. The heavy compression body is then pressed tightly against the pacemaker implantation site by the strap assembly. On the one hand, the heavy compression body is further limited to prevent displacement, and on the other hand, the pressure of the heavy compression body on the pacemaker implantation site remains unchanged, which is conducive to the patient's rapid recovery.

[0018] The device uses a hook-shaped surface and a Velcro strap to adjust the adhesive fabric laterally, while the zipper buckle slides along the zipper to adjust the air bag longitudinally. This dual adjustment mechanism allows the air bag to be precisely aligned with the pacemaker implantation site, ensuring that the pressure point of the heavy object compresses the body precisely aligns with the implantation site, laying the foundation for effective compression.

[0019] In terms of locking stability, the zipper buckle adopts a multi-security structure. The tension of spring one enables the limit plate and clamping disk to stably clamp the thin cloth strip to achieve initial locking. Spring two pushes the limit post to embed into the limit hole to form a secondary limit for the thin cloth strip. In addition, after the air pressure chamber is inflated, the pressure is transmitted through the hydraulic pipe, which causes the abutment post to push the knob to further strengthen the locking. This effectively avoids the damage caused by repeated penetration of the zipper tape by the traditional locking needle, and also prevents the clamping from loosening due to accidental touch, greatly improving the locking stability and durability.

[0020] The device's adjustment, locking, and unlocking processes are rationally designed. Adjustment requires only sliding the adhesive cloth and zipper buckle to easily adjust the position. The locking process requires no complicated operations, as the components automatically cooperate to achieve a stable lock. Unlocking is accomplished by simply releasing pressure, pressing the knob, and rotating the knob. Disassembly is also easy, making it easier to clean and replace the air bag, reducing the operational complexity and workload for medical staff.

[0021] Safety is effectively guaranteed by abandoning the traditional locking pin and locking cylinder structure, avoiding the risk of the locking pin being lost and injuring others. At the same time, the first and second ring belts in the strap assembly can limit the strap position, ensuring stable and uniform compression force, avoiding localized excessive pressure causing discomfort or injury to the patient. The heavy object compression body has been sterilized, also reducing the risk of infection;

[0022] The device can prevent capsular bleeding, blood accumulation and electrode dislocation through stable compression force, which helps reduce the occurrence of postoperative complications. Its comfortable wearing design and reasonable compression method can improve the patient's comfort while ensuring the treatment effect, reduce the patient's activity restriction caused by device discomfort, and thus help the patient recover quickly. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 The present invention Figure 1 A schematic diagram of the enlarged structure at point A;

[0025] Figure 3 Schematic diagram of the cross-sectional structure of the air pressure bag of the present invention;

[0026] Figure 4 2 is a schematic diagram of the rear structure of the zipper tape of the present invention;

[0027] Figure 5 It is a bottom-up structural schematic diagram of the cross section of the limiting plate of the present invention.

[0028] In the figure: 1. Compression vest; 2. Adhesive cloth; 3. Air pressure bag; 4. Zipper tape; 5. Zipper buckle; 6. Zipper; 7. Air pressure chamber; 8. Micro barometer; 9. Limiting plate; 10. Thin cloth strip; 11. Notch; 12. Knob; 13. Cylinder; 14. Conical head; 15. Clamping disk; 16. Connecting ring; 17. Spring 1; 18. Limiting hole; 19. Contraction chamber; 20. Limiting column; 21. Spring 2; 22. Magic plush belt; 23. Horizontal strap; 24. First mesh buckle; 25. Longitudinal strap; 26. Second mesh buckle; 27. First annular belt; 28. Second annular belt; 29. ​​Hydraulic chamber; 30. Piston plate; 31. Abutment column; 32. Hydraulic pipe. DETAILED DESCRIPTION

[0029] In order to make the technical solution of the present invention clearer, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] Example

[0031] like Figure 1 、 Figure 2 and Figure 3 As shown, a post-operative displacement prevention device for cardiac pacemaker implantation is provided, comprising a compression vest 1 and a strap assembly. The compression vest 1 is provided with an adjustable compression mechanism, which comprises an adhesive fabric 2, an air pressure bag 3, and a zipper tape 4. The adhesive fabric 2 is adhered to the compression vest 1. Two zipper tapes 4 are fixed to the adhesive fabric 2 at intervals in the horizontal direction. The zipper tape 4 is provided with a zipper 6. The air pressure bag 3 is located between the two zipper tapes 4. Zipper buckles 5 are connected to the four corners of the air pressure bag 3. The zipper buckles 5 are slidably adapted to the nearest zipper 6.

[0032] A heavy pressure body is provided in the air bag 3, which is pressed against the patient's pacemaker implantation site via a strap assembly. A pressure chamber 7 is formed between the inner and outer walls of the air bag 3. A micro barometer 8 is provided on the air bag 3, and the detection end of the micro barometer 8 is inserted into the pressure chamber 7.

[0033] The compression vest 1 is fixed with two magic plush belts 22 on the upper and lower parts, and the adhesive cloth 2 is provided with a magic hook-shaped surface, which is magically adhered to the magic plush belts 22;

[0034] The strap assembly includes a transverse strap 23, one end of which is fixedly connected to one side of the compression vest 1, and a first mesh buckle 24 is fixed to the other side of the compression vest 1, and the end of the transverse strap 23 away from the compression vest 1 is wrapped around the first mesh buckle 24;

[0035] The strap assembly further includes a longitudinal strap 25, one end of which is fixedly connected to the compression vest 1. The compression vest 1 is provided with a second mesh buckle 26. The end of the longitudinal strap 25 away from the compression vest 1 is wrapped around the second mesh buckle 26. The transverse strap 23 and the longitudinal strap 25 are staggered to squeeze the air pressure bag 3.

[0036] The air pressure bag 3 is provided with an inflation valve nozzle;

[0037] A first annular belt 27 is fixed to the air pressure bag 3, the transverse strap 23 passes through the first annular belt 27 and is connected to the first mesh buckle 24, a second annular belt 28 is fixed to the transverse strap 23, and the longitudinal strap 25 passes through the second annular belt 28 and is connected to the second mesh buckle 26;

[0038] Before use, you need to check the integrity of all parts of the device to ensure that the magic plush belt 22 is not worn, the zipper 6 is smooth and not stuck, the air pressure bag 3 is not leaking, and the micro-barometer 8 displays normally. When using, help the patient to lie down comfortably, put the compression vest 1 on the patient's upper body steadily, and ensure that the edge of the vest fits the torso without wrinkles;

[0039] According to the pacemaker implantation mark located before the operation, adjust the lateral position of the adhesive cloth 2 by the adhesion of the magic hook surface and the magic plush belt 22: slowly push the adhesive cloth 2 to slide horizontally along the magic plush belt 22 until the center area of ​​the air pressure bag 3 is roughly aligned with the implantation mark point, press the adhesive cloth to ensure that the magic hook surface and the plush belt are tightly fitted to prevent displacement during use;

[0040] Next, adjust the longitudinal position: hold the zipper buckles 5 at the four corners of the air pressure bag 3 and slowly slide it along the zipper 6 to the target position. Avoid pulling the zipper tape 4 hard during the process. Ensure that the edge of the air pressure bag 3 is aligned with the boundary of the implantation area to achieve precise alignment.

[0041] Then, slowly inflate the air pressure chamber 7 through the inflation valve nozzle, while observing the changes in the value of the micro-barometer 8, so that the outer wall of the air pressure bag 3 initially fits the patient's skin, and steadily place the sterilized heavy pressure body (such as a sterile sand bag) into the air pressure bag 3, ensuring that the center of the weight is vertically aligned with the implantation point;

[0042] When operating the strap assembly, first pass the transverse strap 23 through the first annular belt 27 on the surface of the air pressure bag 3, wrap the free end around the first mesh buckle 24, and then pull it in the opposite direction until you feel a moderate tension (the patient's main complaint is a slight pressure), then fix the end of the strap;

[0043] Then pass the longitudinal strap 25 through the second annular strap 28 on the transverse strap 23, and fold the free end back and tighten it through the second mesh buckle 26, so that the two straps are cross-staggered and evenly squeeze the air pressure bag 3. At this time, it is necessary to check whether the first annular strap 27 and the second annular strap 28 can effectively limit the displacement of the straps to ensure that the compression force continues to act stably on the implantation position.

[0044] like Figure 4 and Figure 5 As shown, thin fabric strips 10 are integrally formed on opposite sides of the two zipper tapes 4;

[0045] The outer wall of the zipper buckle 5 is fixedly connected to the limit plate 9 in front of the thin cloth strip 10. A notch 11 is provided on the rear surface of the limit plate 9. A cylinder 13 is provided on the inner side of the notch 11. The front end of the cylinder 13 extends to the front of the limit plate 9 and is fixedly connected to a knob 12. The rear end of the cylinder 13 is fixedly connected to a clamping disk 15 located behind the thin cloth strip 10. The front surface of the clamping disk 15 is located on the outside of the cylinder 13 and is connected to a connecting ring 16 through transfer rotation. The connecting ring 16 is fixedly connected to a spring 17 on the opposite side of the notch 11 and on the outside of the cylinder 13. The thin cloth strip 10 is clamped between the limit plate 9 and the clamping disk 15.

[0046] A limit hole 18 is defined on the front surface of the clamping plate 15 and located behind the thin cloth strip 10. A contraction cavity 19 is defined within the limit plate 9. A limit post 20 is slidably connected to the contraction cavity 19. A spring 21 is fixedly connected between the limit post 20 and the contraction cavity 19. The rear end of the limit post 20 is inserted into the limit hole 18 and is integrally formed with a tapered head 14.

[0047] A hydraulic chamber 29 is formed on the side of the limit plate 9 away from the contraction chamber 19. A piston plate 30 is slidably connected to the interior of the hydraulic chamber 29. An abutment column 31 is fixedly connected to the upper surface of the piston plate 30. The top end of the abutment column 31 extends to the front of the limit plate 9 and contacts the rear surface of the knob 12. A hydraulic pipe 32 is fixedly connected between the hydraulic chamber 29 and the air pressure chamber 7.

[0048] After the zipper buckle 5 slides along the zipper 6 to the designated position, the thin cloth strip 10 on the opposite side of the zipper tape 4 is smoothly inserted into the gap between the clamping plate 15 and the limiting plate 9. Under the natural rebound force of the spring 17, the limiting plate 9 and the clamping plate 15 generate a relative clamping force, which puts the thin cloth strip 10 in a slightly tensioned state, preliminarily fixing the position of the zipper buckle 5.

[0049] The secondary limiting mechanism is triggered simultaneously: the second spring 21 pushes the limiting post 20 backward, and the tapered head 14 at the end thereof is inserted into the limiting hole 18 of the clamping plate 15, partially squeezing the thin fabric strip 10 to form a concave locking structure. At this time, the zipper buckle 5 is locked in both the horizontal and vertical directions, effectively preventing accidental sliding;

[0050] After locking is completed, as the air pressure chamber 7 is inflated, the air pressure is transmitted to the hydraulic chamber 29 through the hydraulic pipe 32, pushing the piston plate 30 and driving the abutment column 31 forward until the top of the abutment column 31 is in close contact with the rear surface of the knob 12, forming a mechanical anti-loosening structure - this design can prevent the clamping from loosening due to accidental contact with the knob 12 when the patient turns over or moves, further enhancing the locking stability;

[0051] The unlocking operation needs to be carried out in the following steps: first, release the gas in the air pressure chamber 7 through the inflation valve nozzle, and confirm that the abutment column 31 has been reset (the pushing force on the knob 12 is lost); then press the knob 12 backward with your thumb, at this time the spring 17 is stretched to generate elastic force, and the clamping plate 15 moves backward synchronously with the cylinder 13, releasing the clamping force on the thin cloth strip 10; when the clamping plate 15 moves until the conical head 14 of the limiting column 20 is completely aligned with the limiting hole 18, rotate the knob 12, and the inner wall of the limiting hole 18 squeezes the conical head 14, forcing the limiting column 20 to shrink into the shrinkage chamber 19 (the spring 2 21 is compressed). At this time, the thin cloth strip 10 is free from the squeezing constraint of the limiting column 20 and can be pulled out from between the limiting plate 9 and the clamping plate 15, thereby realizing the separation of the zipper buckle 5 and the zipper tape 4, which is convenient for the disassembly, cleaning or replacement of the air pressure bag 3.

[0052] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A post-implantation displacement prevention device for a cardiac pacemaker, comprising a compression vest (1) and a strap assembly, characterized in that: The compression vest (1) is provided with an adjustable compression mechanism, which comprises an adhesive cloth (2), an air pressure bag (3) and a zipper tape (4). The adhesive cloth (2) is adhered to the compression vest (1). Two zipper tapes (4) are fixed to the adhesive cloth (2) at intervals in the horizontal direction. A zipper (6) is provided on the zipper tape (4). The air pressure bag (3) is located between the two zipper tapes (4). Zipper buckles (5) are connected to the four corners of the air pressure bag (3). The zipper buckle (5) is slidably fitted on the nearest zipper (6). A heavy object pressure body is provided in the air pressure bag (3), and the heavy object pressure body is pressed against the patient's pacemaker implantation position through the strap assembly. An air pressure cavity (7) is formed between the inner wall and the outer wall of the air pressure bag (3). A micro barometer (8) is provided on the air pressure bag (3), and the detection end of the micro barometer (8) is inserted into the air pressure cavity (7); Opposite sides of the two zipper tapes (4) are integrally formed with thin cloth strips (10); The outer wall of the zipper buckle (5) is fixedly connected to a limiting plate (9) in front of the thin cloth strip (10), a notch (11) is provided on the rear surface of the limiting plate (9), a cylinder (13) is provided on the inner side of the notch (11), the front end of the cylinder (13) passes through the front of the limiting plate (9) and is fixedly connected to a knob (12), the rear end of the cylinder (13) is fixedly connected to a clamping disk (15) in the rear of the thin cloth strip (10), the front surface of the clamping disk (15) is located on the outer side of the cylinder (13) and is connected to a connecting ring (16) through transfer rotation, the connecting ring (16) is fixedly connected to a spring (17) on the opposite side of the notch (11) and located on the outer side of the cylinder (13), and the thin cloth strip (10) is clamped between the limiting plate (9) and the clamping disk (15).

2. The device for preventing displacement after cardiac pacemaker implantation according to claim 1, characterized in that: The compression vest (1) is fixed with two magic plush belts (22) at the top and bottom, and the adhesive cloth (2) is provided with a magic hook-shaped surface, and the magic hook-shaped surface is magically adhered to the magic plush belts (22).

3. The device for preventing displacement after cardiac pacemaker implantation according to claim 1, characterized in that: The strap assembly comprises a transverse strap (23), one end of the transverse strap (23) is fixedly connected to one side of the compression vest (1), a first mesh buckle (24) is fixed to the other side of the compression vest (1), and the end of the transverse strap (23) away from the compression vest (1) is wrapped around the first mesh buckle (24).

4. The device for preventing displacement after cardiac pacemaker implantation according to claim 3, characterized in that: The strap assembly further comprises a longitudinal strap (25), one end of the longitudinal strap (25) is fixedly connected to the compression vest (1), a second mesh buckle (26) is provided on the compression vest (1), one end of the longitudinal strap (25) away from the compression vest (1) is wound around the second mesh buckle (26), and the transverse strap (23) and the longitudinal strap (25) are interlaced to squeeze the air pressure bag (3).

5. The device for preventing displacement after cardiac pacemaker implantation according to claim 1, characterized in that: The air pressure bag (3) is provided with an inflation valve.

6. The device for preventing displacement after cardiac pacemaker implantation according to claim 1, characterized in that: A first annular belt (27) is fixed on the air pressure bag (3), the transverse strap (23) passes through the first annular belt (27) and is connected to the first mesh buckle (24), a second annular belt (28) is fixed on the transverse strap (23), and the longitudinal strap (25) passes through the second annular belt (28) and is connected to the second mesh buckle (26).

7. The device for preventing displacement after cardiac pacemaker implantation according to claim 1, characterized in that: A limiting hole (18) is provided on the front surface of the clamping disk (15) and behind the thin cloth strip (10); a contraction cavity (19) is provided inside the limiting plate (9); a limiting column (20) is slidably connected inside the contraction cavity (19); a spring 2 (21) is fixedly connected between the limiting column (20) and the contraction cavity (19); a rear end of the limiting column (20) is inserted into the interior of the limiting hole (18) and is integrally formed with a conical head (14).

8. The device for preventing displacement after cardiac pacemaker implantation according to claim 7, characterized in that: A hydraulic chamber (29) is provided on a side of the limit plate (9) away from the contraction chamber (19), and a piston plate (30) is slidably connected to the interior of the hydraulic chamber (29). An abutment column (31) is fixedly connected to the upper surface of the piston plate (30), and the top end of the abutment column (31) passes through the front of the limit plate (9) and contacts the rear surface of the knob (12). A hydraulic pipe (32) is fixedly connected between the hydraulic chamber (29) and the air pressure chamber (7).

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