Radial artery pressurizing device

Abstract

The invention relates to the technical field of radial artery pressurizing devices, and discloses a radial artery pressurizing device which comprises a pressurizing mechanism and a mechanism shell composed of an upper cover and a base. A control button, a display screen and a PCB control board, the control button, the display screen and the PCB control board are electrically connected to form a control mechanism, and the control mechanism is used for manually adjusting pressure; a pressurizing head is arranged at the output end of the electric control actuator, and a replaceable tearable film is arranged at the bottom of the pressurizing head; and the power supply is electrically connected with the electric control actuator, the PCB control board and the display screen of the PCB control board and supplies power continuously, and a timing program is arranged in the PCB control board. Through accurate control of the electric control actuator and the PCB control board, the problem of non-uniform pressure caused by traditional manual air exhaust operation is avoided; the problem that a traditional air bag cannot be inflated again is solved, finally, a 24-hour automatic control program avoids interference of frequent operation at night on sleep of the patient, and rehabilitation of the elderly patient is particularly facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of radial artery compression devices, and specifically provides a radial artery compression device. Background Art

[0002] A radial artery compression device is mainly used for the hemostatic treatment of the radial artery puncture site after cardiovascular interventional surgery. With the popularization of transradial interventional diagnosis and treatment technology, effective hemostasis of the postoperative puncture site has become a key issue of clinical concern. The traditional hemostatic methods have many deficiencies, which have prompted the research and development of more intelligent and precise compression hemostasis devices.

[0003] The existing technologies mostly adopt airbag compression hemostasis devices, which apply pressure to the puncture site through an inflated airbag and achieve hemostasis by mechanical pressure. During operation, manual inflation and pressurization are required, and step-by-step decompression is achieved by timed manual deflation. Such devices are usually equipped with pressure indicators, and medical staff need to regularly check the pressure value and make corresponding adjustments.

[0004] For the existing radial artery compression devices, due to relying on manual operation for inflation and deflation adjustment, it is difficult to achieve precise pressure control, and it is easy to cause uneven pressure, which not only affects the hemostatic effect but also may lead to complications due to improper pressure. At the same time, it is impossible to perform real-time and precise adjustment according to individual patient differences, affecting the treatment effect. Summary of the Invention

[0005] Aiming at the deficiencies of the existing technologies, the present invention provides a radial artery compression device, which solves the problems of the existing radial artery compression devices that it is difficult to achieve precise pressure control due to relying on manual operation for inflation and deflation adjustment, easy to cause uneven pressure, which not only affects the hemostatic effect but also may lead to complications due to improper pressure.

[0006] To achieve the above objectives, the present invention is realized through the following technical solutions: A radial artery compression device, which is used for hemostasis after radial artery extubation, includes:

[0007] A compression mechanism, which consists of an upper cover and a base to form the mechanism housing;

[0008] Control buttons, a display screen and its PCB control board, the control buttons, the display screen and the PCB control board are electrically connected and form a control mechanism for manually adjusting the pressure;

[0009] An electric actuator, the output end of the electric actuator is provided with a compression head, and a replaceable tearable film is provided at the bottom of the compression head;

[0010] A power supply, which is electrically connected to the electric actuator, the PCB control board and its display screen to provide continuous power supply.

[0011] Preferably, the PCB control board is built with a timing program that automatically controls the electric actuator to reduce the pressure by one level every 2 hours. The pressure reduction amplitude is the equivalent pressure of 2 ml of gas, and the matching relationship between the pressure and time is checked in real time. If the deviation is ≥ 2 levels, the buzzer will be triggered to alarm.

[0012] Preferably, the PCB control board is built with a 24-hour automatic control program that runs continuously after the device is started and gradually reduces the pressure at preset time intervals; when the total wearing time reaches 24 hours, it automatically controls the electric actuator to completely release the pressure, and prompts to remove the device through the buzzer. At the same time, the display screen shows the treatment completion status.

[0013] Preferably, the PCB control board further includes a pressure feedback module that real-time monitors the actual pressure value of the pressure head, displays it through the display screen, and compares it with the target pressure value in the preset program; if it is determined that the hemostasis is abnormal, the buzzer will be automatically triggered to alarm and the pressure reduction program will be stopped.

[0014] Preferably, the PCB control board is further integrated with a data storage module for recording the pressure change curve and heart rate monitoring data.

[0015] Preferably, the electric actuator is a micro stepping motor or a linear motor, and its output pressure accuracy is controlled within 1%.

[0016] Preferably, the power supply is a rechargeable battery and is provided with a charging interface. The tearable film is a disposable medical sterile film and is detachably connected to the pressure head through an adhesive or snap structure.

[0017] Preferably, a sealing structure is provided between the pressure head and the base, including a flexible sealing strip, so that the pressure head can move up and down and keep the cavity sealed.

[0018] Preferably, detachable wristbands are provided at both ends of the pressurizing mechanism. The detachable wristbands are made of high-elasticity materials and are used to fit different patients. One end of the two detachable wristbands is connected through an adjusting mechanism. The inner wall of the adjusting mechanism is fixedly connected with a rubber buffer pad, and an adjusting component is arranged inside the adjusting mechanism.

[0019] Preferably, the adjusting component includes a wire roller and a rope. One end of the rope is fixedly connected to one end of the detachable wristband. The rope is wound around the outer wall of the wire roller. A sliding column is slidably connected inside the wire roller. One end of the sliding column is fixedly connected to an adjusting knob. The other end of the sliding column is fixedly connected to a connecting column. A ratchet is slidably arranged on the outer wall of the connecting column through a plurality of clamping corners. The outer ring of the ratchet is fixedly connected inside the adjusting mechanism. One end of the connecting column is fixedly connected to a sliding rod. One end of the sliding rod is fixedly connected to a limiting plate. A spring is sleeved on the outer wall of the sliding rod. One end of the spring abuts against one side of the outer wall of the limiting plate, and the other end of the spring abuts against the inside of the adjusting mechanism.

[0020] The present invention provides a radial artery pressurizing device. It has the following beneficial effects:

[0021] 1. Through the precise control of the electric actuator and the PCB control board, the present invention realizes the pressure adjustment with an accuracy of 1%, avoiding the problem of uneven pressure caused by the traditional manual air extraction operation. Secondly, the control button allows medical staff to adjust the pressure at any time according to the individual differences of patients, solving the problem that the traditional airbag cannot be inflated again. Finally, the 24-hour automatic control program avoids the interference of frequent operations at night on the patient's sleep, which is particularly beneficial to the rehabilitation of elderly patients.

[0022] 2. Through the rope tightening mechanism of the detachable wristband cooperating with the adjusting mechanism, the present invention can quickly and firmly fix the device on the patient's arm. The self-locking function of the ratchet ensures that it will not accidentally loosen during the wearing process, not only ensuring the stability of the treatment process but also reducing the operation burden of medical staff.

[0023] 3. Through the synergistic effect of the adjusting knob, the sliding column, the connecting column and the sliding rod, and the elastic adjustment of the spring, the present invention can realize the precise control of the length of the detachable wristband. The unique ratchet unlocking mechanism makes the adjustment process simple and fast, and can adapt to the differences in the thickness of the arms of different patients, greatly improving the versatility and clinical applicability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a three-dimensional structural schematic diagram of a radial artery pressurizing device proposed by the present invention;

[0025] Figure 2 is an internal structural schematic diagram of the pressurizing mechanism of a radial artery pressurizing device proposed by the present invention;

[0026] Figure 3 is a structural schematic diagram of one end of the detachable wristband of a radial artery pressurizing device proposed by the present invention;

[0027] Figure 4Schematic diagram of the internal structure of the adjustment mechanism of a radial artery compression device proposed by the present invention;

[0028] Figure 5 Schematic diagram of the structure below the adjustment knob of a radial artery compression device proposed by the present invention;

[0029] Figure 6 is Figure 5 Enlarged view of part A in

[0030] Among them, 1. Compression mechanism; 101. Upper cover; 102. Control button; 103. Display screen; 104. Base; 105. Power supply; 106. Electric actuator; 107. PCB control board; 108. Compression head; 109. Removable film; 2. Removable wristband; 3. Adjustment mechanism; 4. Rubber buffer pad; 5. Adjustment knob; 6. Thread roller; 7. Rope; 8. Sliding column; 9. Connecting column; 10. Slide bar; 11. Limiting plate; 12. Spring; 13. Ratchet. Detailed implementation method

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0032] Embodiment:

[0033] Please refer to the attached Figure 1 - attached Figure 6 , the embodiment of the present invention provides a radial artery compression device, including:

[0034] The compression mechanism 1, which consists of the upper cover 101 and the base 104 to form the mechanism housing. The upper cover 101 is used to support the control button 102 and the display screen 103, and the base 104 provides a stable installation foundation for the entire compression mechanism 1;

[0035] The control button 102, the display screen 103 and its PCB control board 107. The control button 102, the display screen 103 and the PCB control board 107 are electrically connected and form a control mechanism for manually adjusting the pressure. Among them, the control button 102 includes "+" and "-" buttons, which can manually adjust the pressure value when the automatic program fails to stop bleeding. The display screen 103 real-time displays the current pressure value and the usage time, and the PCB control board 107 is the core arithmetic unit of the entire control logic;

[0036] The electric actuator 106 has an output end provided with a pressing head 108. A replaceable tearable film 109 is provided at the bottom of the pressing head 108. The electric actuator 106 drives the pressing head 108 to move up and down through a built-in micro-motor to apply precise pressure. The tearable film 109 is made of medical sterile material and is fixed by bonding or buckling. After being used by a single patient, the device can be disassembled and replaced to achieve repeated use of the device;

[0037] Power supply 105 is electrically connected to the electric control actuator 106, the PCB control board 107 and its display screen 103, and provides continuous power supply. The power supply 105 is a rechargeable lithium battery, equipped with a dedicated charging interface, supporting long-term continuous operation and facilitating repeated charging. The PCB control board 107 has a built-in timing program, which automatically controls the electric control actuator 106 to reduce the pressure by one step every 2 hours. The pressure reduction amplitude is the equivalent pressure of 2 ml of gas. This pressure conversion is based on the precise calculation of the actuator's actuating force and the area of the pressure head 108, and the matching relationship between the pressure and time is checked in real time. If the deviation is ≥ 2 steps, the buzzer will be triggered to alarm. The buzzer is integrated on the PCB control board 107, and when alarming, it will synchronously remind medical staff with sound and light signals. The PCB control board 107 has a built-in 24-hour automatic control program, which runs continuously after the device is started and gradually reduces the pressure at preset time intervals. The program includes a complete pressure reduction curve algorithm. When the total wearing time reaches 24 hours, it automatically controls the electric control actuator 106 to completely release the pressure, and prompts to remove the device through the buzzer. At the same time, the display screen 103 shows the treatment completion status, and the buzzer is used to avoid the risk of overpressure caused by delayed manual operation. The PCB control board 107 also includes a pressure feedback module, which monitors the actual pressure value of the pressure head 108 in real time. The pressure feedback module realizes data acquisition through a high-precision pressure sensor and displays it through the display screen 103, and at the same time compares it with the target pressure value in the preset program. If it is determined that the hemostasis is abnormal, the buzzer will be automatically triggered to alarm and the pressure reduction program will be stopped. The PCB control board 107 also integrates a data storage module, which is used to record the pressure change curve and heart rate monitoring data. The data storage module supports continuous data storage for at least 72 hours, facilitating medical staff to trace the treatment process and optimize subsequent plans. The heart rate monitoring function is realized by obtaining the radial artery pulsation frequency through a built-in sensor. The electric control actuator 106 is a micro stepping motor or a linear motor, and its output pressure accuracy is controlled within 1%. The actuating force is calibrated in real time through a closed-loop control algorithm to ensure that the applied pressure highly coincides with the preset value, meeting the clinical requirements for precise pressurization. The power supply 105 is a rechargeable battery and is equipped with a charging interface. The charging interface is compatible with the general USB standard and supports the fast charging function. The removable film 109 is a disposable medical sterile film, which is detachably connected to the pressure head 108 through an adhesive or snap structure, ensuring convenient replacement and reliable sealing, meeting the requirements of hospital infection control. A sealing structure is provided between the pressure head 108 and the base 104, including a flexible sealing strip. The sealing strip is made of medical-grade silicone material, enabling the pressure head 108 to move up and down and maintaining the cavity sealed, preventing external pollutants from entering and affecting the pressure control accuracy, and at the same time preventing pressure failure caused by gas leakage.

[0038] Specifically, first tear off the disposable medical sterile tearable film 109 from the bottom of the pressure head 108 to ensure the hygiene and safety of the contact area. Subsequently, the pressurizing mechanism 1 uses a micro stepping motor or a linear motor driven by a precision electronic actuator 106 to apply an accurately controllable pressure to the radial artery puncture site by the pressure head 108. The pressure value is intelligently controlled by a preset program of a high-performance PCB control board 107, and the pressure adjustment accuracy can reach 1%. After the device is started, the built-in 24-hour automatic control program of the PCB control board 107 starts to run. Every 2 hours, the equivalent pressure of 2 ml of gas is automatically reduced through the electronic actuator 106 to achieve a scientific and accurate stepped decompression process. During this process, the high-definition display screen 103 real-time displays key parameters such as the current pressure value and the remaining treatment time, which is convenient for medical staff to monitor. When the system detects that the pressure and time deviation ≥ 2 steps or abnormal hemostasis occurs, the buzzer built in the PCB control board 107 immediately gives an audible and visual alarm. Medical staff can manually adjust the pressure by operating the "+" and "-" buttons of the control button 102. If the "+" button is pressed to increase the pressure, the PCB control board 107 will automatically recalculate and optimize the subsequent decompression curve, and the control program will perform intelligent stepwise reduction according to the relationship between the increased pressure value and time. The design of the quickly replaceable tearable film 109 ensures that the device can be reused, and the flexible sealing structure set between the pressure head 108 and the base 104 effectively maintains the cavity tightness. The high-capacity rechargeable power supply 105 provides continuous and stable power supply for the whole system. When the treatment reaches 24 hours, the device automatically executes the pressure relief program and prompts the medical staff to remove the device through the buzzer and the display screen 103.

[0039] In one embodiment, detachable wristbands 2 are provided at both ends of the pressurizing mechanism 1. The detachable wristbands 2 are made of high-elasticity materials and are used to fit different patients. The detachable wristbands 2 adopt breathable and skin-friendly nylon elastic fabrics and are used to fit the arm sizes of different patients. One ends of the two detachable wristbands 2 are connected through an adjusting mechanism 3. The inner wall of the adjusting mechanism 3 is fixedly connected with a rubber buffer pad 4. The rubber buffer pad 4 increases the wearing comfort, disperses the contact pressure, and prevents skin abrasion. The rubber buffer pad 4 adopts a wavy texture design to enhance the friction force. An adjusting component is arranged inside the adjusting mechanism 3 to achieve precise adjustment of the wristband tightness.

[0040] Specifically, first properly put the detachable wristband 2 on the radial artery extubation site of the patient. During operation, rotate the adjusting knob 5 clockwise to drive the sliding column 8 inside the adjusting mechanism 3 to rotate synchronously. Through multiple precision feet evenly distributed on the outer wall of the sliding column 8, the wire roller 6 is accurately driven to rotate. The rotation of the wire roller 6 causes the high-strength medical-grade rope 7 to wind orderly on its outer wall, resulting in a gradual shortening of the effective length of the rope 7, so that the detachable wristband 2 contracts smoothly and finally fits tightly and comfortably on the patient's arm.

[0041] In one embodiment, the adjustment assembly includes a wire roller 6 and a rope 7. The rope 7 is connected to drive the wristband to contract and transmit the adjustment force to achieve length change. One end of the rope 7 is fixedly connected to one end of the detachable wristband 2. The rope 7 is wound around the outer wall of the wire roller 6. The wire roller 6 winds and unwinds the rope 7 to convert rotational motion into linear contraction to provide mechanical gain. The rope 7 is wound and unwound by the rotation of the wire roller 6. A sliding column 8 is slidably connected inside the wire roller 6. The sliding column 8 drives the wire roller 6 to rotate synchronously to transmit the adjustment force. One end of the sliding column 8 is fixedly connected to an adjustment knob 5, and the other end of the sliding column 8 is fixedly connected to a connecting column 9. The connecting column 9 connects the sliding column 8 and the ratchet 13 mechanism to transmit rotational motion to achieve the unlocking function. The ratchet 13 is slidably arranged on the outer wall of the connecting column 9 through a plurality of locking corners. The ratchet 13 provides a one-way locking function to prevent accidental loosening and maintain the adjusted position. The outer ring of the ratchet 13 is fixedly connected inside the adjustment mechanism 3. One end of the connecting column 9 is fixedly connected to a sliding rod 10. One end of the sliding rod 10 is fixedly connected to a limiting plate 11. The limiting plate 11 limits the movement stroke as the supporting surface of the spring 12 to ensure the movement accuracy of the mechanism. A spring 12 is sleeved on the outer wall of the sliding rod 10. The spring 12 provides a reset elastic force to maintain the stability of the mechanism and assist the unlocking operation. One end of the spring 12 abuts against one side of the outer wall of the limiting plate 11, and the other end of the spring 12 abuts against the inside of the adjustment mechanism 3.

[0042] Specifically, the rotation of the sliding column 8 is transmitted through the precisely machined connecting column 9 and sliding rod 10 to drive the highly reliable ratchet 13 mechanism to operate. When the adjustment knob 5 is released, the self-locking function of the ratchet 13 immediately takes effect, ensuring that the detachable wristband 2 is firmly fixed on the patient's arm without loosening. When the tightness needs to be adjusted, first pull the adjustment knob 5 vertically upward to drive the sliding column 8, connecting column 9, sliding rod 10 and limiting plate 11 to move upward as a whole. At this time, the limiting plate 11 compresses the high-precision spring 12 to store energy. When the connecting column 9 completely disengages from the locking position of the ratchet 13, the adjustment knob 5 can be rotated counterclockwise to release the rope 7, realizing stepless adjustment of the length of the detachable wristband 2. This innovative design enables the device to perfectly adapt to the arm sizes of patients with different body types, ensuring the treatment effect while improving the wearing comfort.

[0043] Working principle: When using this radial artery pressurization device, first tear off [the relevant part]. Then, the pressurization mechanism drives the pressure head through an electric actuator to apply precise pressure to the radial artery puncture site. The pressure value is controlled by the preset program of the PCB control board, with an accuracy of 1%. After the device is started, the PCB control board executes a 24-hour automatic control program. Every 2 hours, it automatically reduces the equivalent pressure of 2 ml of gas through the electric actuator to achieve stepped decompression. At the same time, the pressure value and usage time are displayed in real time on the display screen. When it is detected that the deviation between pressure and time is ≥ 2 steps or abnormal hemostasis occurs, the buzzer will immediately alarm. Medical staff can manually adjust the pressure through the '+' and '-' buttons of the control button. If the '+' button is pressed to increase the pressure, the PCB control board will automatically recalculate the subsequent decompression curve, and the control program will perform stepped decrement according to the increased pressure and time. The replaceable tearable film ensures that the device can be reused. The sealing structure is set between the pressure head and the base 104 to maintain the airtightness of the cavity. The power supply continuously powers the system. After 24 hours of treatment, the device automatically relieves pressure and prompts for removal;

[0044] In addition, put the detachable wristband on the patient's radial artery catheter extraction site. At this time, drive the adjustment knob to rotate inside the adjustment mechanism. Drive the sliding column to rotate through the adjustment knob, and then cooperate with multiple clamping feet on the outer wall of the sliding column to drive the wire roller to rotate. Thus, drive one end of the rope to move through the wire roller, and the rope winds around the outer wall of the wire roller, making the rope gradually shorten. Furthermore, make the detachable wristband contract, so that the detachable wristband tightly fits on the patient's arm. During this process, the rotation of the sliding column will also drive the connecting column and the sliding rod to rotate. At this time, drive the ratchet to operate through the connecting column. When the adjustment knob is released, due to the self-locking function of the ratchet, the detachable wristband can be fixed on the patient's arm. When adjustment is needed, first pull the adjustment knob to drive the sliding column, connecting column, sliding rod, and limiting plate to move upward. At this time, drive the spring to contract through the movement of the limiting plate. When the connecting column disengages from the inside of the ratchet, the adjustment knob can be rotated in the reverse direction to release the rope. Then, the adjustment of the detachable wristband can be achieved, so that it can adapt to different patients.

[0045] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A radial artery compression device, characterized in that: This pressurizing device is used for hemostasis after radial artery catheter removal and includes: A pressurizing mechanism (1), which consists of an upper cover (101) and a base (104) to form the housing of the mechanism; A control button (102), a display screen (103) and its PCB control board (107). The control button (102), the display screen (103) and the PCB control board (107) are electrically connected and form a control mechanism for manually adjusting the pressure; An electric actuator (106), with a pressure head (108) provided at the output end of the electric actuator (106), and a replaceable tearable film (109) provided at the bottom of the pressure head (108); A power supply (105), which is electrically connected to the electric actuator (106), the PCB control board (107) and its display screen (103) to provide continuous power supply.

2. The radial artery compression device according to claim 1, characterized in that: The PCB control board (107) has a built-in timing program, which automatically controls the electric actuator (106) to reduce the pressure by one step every 2 hours. The pressure reduction amplitude is the equivalent pressure of 2 ml of gas, and it also real-time checks the matching relationship between the pressure and time. If the deviation is ≥ 2 steps, the buzzer will be triggered to alarm.

3. The radial artery compression device according to claim 1, characterized in that: The PCB control board (107) has a built-in 24-hour automatic control program, which runs continuously after the device is started and gradually reduces the pressure at preset time intervals; when the total wearing time reaches 24 hours, it automatically controls the electric actuator (106) to completely release the pressure, and prompts to remove the device through the buzzer. At the same time, the display screen (103) shows the treatment completion status.

4. The radial artery compression device according to claim 1, characterized in that: The PCB control board (107) also includes a pressure feedback module, which real-time monitors the actual pressure value of the pressure head (108) and displays it through the display screen (103), and at the same time compares it with the target pressure value in the preset program; if it is determined that the hemostasis is abnormal, the buzzer will be automatically triggered to alarm and the pressure reduction program will be stopped.

5. The radial artery compression device according to claim 1, wherein: The PCB control board (107) also integrates a data storage module for recording the pressure change curve and heart rate monitoring data.

6. The radial artery compression device according to claim 1, characterized in that: The electric actuator (106) is a micro stepping motor or a linear motor, and its output pressure accuracy is controlled within 1%.

7. The radial artery compression device according to claim 1, wherein: The power supply (105) is a rechargeable battery and is provided with a charging interface. The tearable film (109) is a disposable medical sterile film and is detachably connected to the pressure head (108) through an adhesive or snap structure.

8. The radial artery compression device according to claim 1, characterized in that: A sealing structure is provided between the pressure head (108) and the base (104), including a flexible sealing strip, so that the pressure head (108) can move up and down and keep the cavity sealed.

9. The radial artery compression device according to claim 1, characterized in that: Removable wristbands (2) are provided at both ends of the pressurizing mechanism (1). The removable wristbands (2) are made of high-elasticity materials and are used to fit different patients. One end of the two removable wristbands (2) is connected through an adjustment mechanism (3). A rubber buffer pad (4) is fixedly connected to the inner wall of the adjustment mechanism (3), and an adjustment component is provided inside the adjustment mechanism (3).

10. The radial artery compression device according to claim 9, characterized in that: The adjusting assembly includes a wire roller (6) and a rope (7). One end of the rope (7) is fixedly connected to one end of the detachable wristband (2). The rope (7) is wound around the outer wall of the wire roller (6). A sliding column (8) is slidably connected inside the wire roller (6). One end of the sliding column (8) is fixedly connected to an adjusting knob (5). The other end of the sliding column (8) is fixedly connected to a connecting column (9). A ratchet wheel (13) is slidably arranged on the outer wall of the connecting column (9) through a plurality of clamping corners. The outer ring of the ratchet wheel (13) is fixedly connected inside the adjusting mechanism (3). One end of the connecting column (9) is fixedly connected to a sliding rod (10). One end of the sliding rod (10) is fixedly connected to a limiting plate (11). A spring (12) is sleeved on the outer wall of the sliding rod (10). One end of the spring (12) abuts against one side of the outer wall of the limiting plate (11), and the other end of the spring (12) abuts against the inside of the adjusting mechanism (3).

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