Adjustable bone nail traction device

Abstract

The utility model discloses an adjustable bone nail traction device, and relates to the technical field of medical supplies, the adjustable bone nail traction device comprises a kirschner wire, a traction bow and a traction rope, the kirschner wire is fixed at traction lugs at two ends of the traction bow, the traction rope is arranged at one end, far away from the traction lugs, of the traction bow, and the kirschner wire is connected with the traction bow. A tension meter is connected between the traction rope and the traction bow, and a base is arranged at the lower end of the traction rope; the pushing structure is fixedly arranged on the upper surface of the base, and the pushing structure is used for providing pushing force for the traction rope; the pulley structure is fixedly arranged on the upper surface of the base, and the pulley structure is used for converting the pushing force provided by the pushing structure for the traction rope into the pulling force for the traction bow; and the control structure is fixedly arranged on the upper surface of the base, and the control structure is used for adjusting the magnitude of the pushing force provided by the pushing structure to the traction rope. When the device is used, additional fixing points are not needed, and the device is convenient to use and easy to operate.

Description

Technical Field

[0001] The utility model relates to the technical field of medical supplies, in particular to an adjustable bone screw traction device. Background Art

[0002] Bone screw traction is bone traction, which means using round bone pins or stainless steel needles to directly penetrate the hard part of the bone, and then directly traction the bone by guiding gravity to maintain the position of the fracture, achieve reduction as much as possible, and reduce the possibility of damage to blood vessels and nerves by the fracture ends. In the case of multiple fractures, it can also reduce the area of ​​trauma.

[0003] Currently, when bone traction is used clinically, most people use weights for counterweighting. The weights are suspended on one side of the bed and are prone to collision with walking people, thereby pulling the patient's limbs and causing pain to the patient. In addition, in order to meet the different pulling forces required for treatment, weights of different weights need to be prepared, which is very inconvenient.

[0004] To address these issues, Chinese Patent Publication No. CN220385165U proposes a bone screw traction device with a tension regulator. This device, which rotates a screw manually or through a motor-driven gear train, moves the slide downward relative to the screw, thereby applying tension to the bone screw through a traction rope connected to the slide. This device eliminates the need for a weight, and the magnitude of the tension can be visually measured using a dynamometer. However, the use of a screw to drive the nut pair causes significant wear, making the device unsuitable for frequent use. Excessive traction can also cause the screw and nut pair to become stuck. Furthermore, the device requires additional fixing points, reducing ease of use. Utility Model Content

[0005] The utility model provides an adjustable bone screw traction device, which has the advantages of simple operation, low wear between structures and no need for additional fixing points, so as to solve the problems raised in the above background technology.

[0006] In order to achieve the purposes of simple operation, low wear between structures and no need for additional fixed points, the utility model provides the following technical solutions: an adjustable bone screw traction device, comprising a Kirschner wire, a traction bow and a traction rope, and also comprising: the Kirschner wire is fixed to the traction ears at both ends of the traction bow, the traction rope is arranged at the end of the traction bow away from the traction ear, a tension meter is connected between the traction rope and the traction bow, and the lower end of the traction rope is provided with a base; a pushing structure, the pushing structure is fixed on the upper surface of the base, and the pushing structure is used to provide thrust to the traction rope; the pulley structure, the pulley structure is fixed on the upper surface of the base, and the pulley structure is used to convert the thrust provided by the pushing structure to the traction rope into a pulling force on the traction bow; the control structure, the control structure is fixed on the upper surface of the base, and the control structure is used to adjust the magnitude of the thrust provided by the pushing structure to the traction rope.

[0007] As an optimal technical solution of the present invention, the pushing structure includes a cylinder body, which is fixedly connected to the base, and a cavity is opened inside the cylinder body, and a piston is provided in the cavity, and the outer circumference of the piston is tightly fitted with the surface of the cavity, and a piston rod is fixedly connected at the center of one end of the piston, and the end of the piston rod away from the piston passes through the cylinder body, and a first spring is provided between the piston and the cavity, and the first spring is sleeved on the piston rod, and the piston and the piston rod can move in the cylinder body; the end of the piston rod away from the piston is fixedly connected to the traction rope; the end of the cylinder body away from the piston rod is opened with a cylinder air port, and an air pump is fixedly installed on the base, and the air pump is used to supply compressed air to the cylinder air port.

[0008] As a preferred technical solution of the present invention, the pulley structure includes a bracket, support plates are fixed on both sides of the bracket, and a first pulley and a second pulley are respectively provided at both ends of the top of the support plate, and the first pulley and the second pulley are both rotatably connected to the support plate; a section of the traction rope close to the first pulley passes around the lower end of the first pulley and is connected to the dynamometer, and an end of the traction rope close to the second pulley passes around the upper end of the second pulley and is fixed to the piston rod.

[0009] As a preferred technical solution of the present invention, the height of the second pulley is greater than the height of the upper end of the piston rod, and the height of the bottom end of the support plate is lower than the height of the lower end of the piston rod.

[0010] As a preferred technical solution of the present invention, the control structure includes a control box, a sliding cavity is provided in the control box, a push rod is provided in the sliding cavity, one end of the push rod passes through the control box, the outer circumference of the push rod is fixed with a first movable plug and a second movable plug in sequence along the axial direction, and the first movable plug is close to the through end of the control box, the outer circumference of the first movable plug and the second movable plug are tightly fitted with the inner wall of the sliding cavity, the control box is provided with an air inlet corresponding to the first movable plug, the control box is provided with an exhaust port corresponding to the second movable plug, and the control box has an air inlet and an exhaust port corresponding to the air inlet. An air supply port is provided between the ports, and an auxiliary exhaust port is provided on the side of the control box corresponding to the air inlet away from the air supply port; an air intake cavity is provided on the inner wall of the sliding cavity at the first movable plug, and the width of the air intake cavity is smaller than the width of the first movable plug; an exhaust cavity is provided on the inner wall of the sliding cavity at the second movable plug, and the width of the exhaust cavity is smaller than the width of the second movable plug; a second spring is provided between the side of the first movable plug away from the second movable plug and the sliding cavity, and the second spring is sleeved on the push rod, and a third spring is provided between the side of the second movable plug away from the first movable plug and the sliding cavity.

[0011] As a preferred technical solution of the present invention, a second pipe is connected between the cylinder air port and the air supply port, and a first pipe is connected between the output end and the air inlet of the air pump.

[0012] As a preferred technical solution of the present invention, a counterweight is fixedly mounted on the base, and the counterweight is used to increase the weight of the device.

[0013] Compared with the prior art, the present invention provides an adjustable bone screw traction device with the following beneficial effects:

[0014] 1. This adjustable bone screw traction device is provided with a control box, and a sliding cavity, an air inlet, an air supply port, and an exhaust port are provided in the control box. At the same time, a push rod, a first movable plug, and a second movable plug are provided in the sliding cavity to cooperate with the above structure to facilitate the control of the flow path of the compressed gas, thereby controlling the thrust generated by the pushing structure, and further controlling the pulling force on the traction bow. It is simple to operate and easy to control, with low wear and failure rate between structures. Each structure is independent of each other, which is easy to maintain.

[0015] 2. This adjustable bone screw traction device integrates the pushing structure, pulley structure and control structure into the base and provides a counterweight block, so that the device does not require additional fixing points when in use, and only requires a flat area, which improves the convenience of using the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of the utility model;

[0017] Figure 2 This is a top view of the utility model;

[0018] Figure 3 This is a cross-sectional view of the propulsion structure of the utility model;

[0019] Figure 4 This is a cross-sectional view of the control structure of the utility model;

[0020] Figure 5 This is a side sectional view of the pulley structure of the utility model.

[0021] In the figure: 1. Kirschner wire; 2. traction bow; 3. traction rope; 4. dynamometer; 5. first pulley; 6. second pulley; 7. bracket; 71. support plate; 8. cylinder; 81. cavity; 82. piston; 83. piston rod; 84. first spring; 85. cylinder air port; 9. air pump; 10. control box; 101. sliding cavity; 102. push rod; 103. first movable plug; 104. second movable plug; 105. second spring; 106. third spring; 107. air inlet cavity; 108. exhaust cavity; 109. pulling head; 1010. auxiliary exhaust port; 1011. air inlet; 1012. air supply port; 1013. exhaust port; 11. counterweight; 12. base; 13. first pipeline; 14. second pipeline. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] See also Figure 1-Figure 2 The utility model discloses an adjustable bone screw traction device, including a Kirschner wire 1 fixed on the patient's limb, a traction bow 2 and a traction rope 3 that play a fixing and traction role, and also includes: the Kirschner wire 1 is fixed at the traction ears at both ends of the traction bow 2, the traction rope 3 is arranged at the end of the traction bow 2 away from the traction ears, a dynamometer 4 is connected between the traction rope 3 and the traction bow 2, and the lower end of the traction rope 3 is provided with a base 12 for fixing the main part of the device.

[0024] In addition, the device is provided with a pushing structure fixed on the upper surface of the base 12, and the pushing structure is used to provide thrust to the traction rope 3; the upper surface of the base 12 is also fixed with a pulley structure, and the pulley structure is used to convert the thrust provided by the pushing structure to the traction rope 3 into a pulling force on the traction bow 2; the upper surface of the base 12 is also fixed with a control structure, and the control structure is used to adjust the magnitude of the thrust provided by the pushing structure to the traction rope 3.

[0025] In this embodiment, the traction rope 3 needs to be in a straight state so that the traction rope 3 is subjected to a pre-tightening force between the traction bow 2 and the propulsion structure. The dynamometer 4 is used to measure and display the magnitude of the tension between the traction rope 3 and the traction bow 2, so that the staff can accurately adjust the traction force of the device.

[0026] Combine Figure 1-Figure 3The pushing structure includes a cylinder body 8, which is fixedly connected to the base 12. In order to improve the stability of the cylinder body 8, a support can be installed between the cylinder body 8 and the base 12. A cavity 81 is opened inside the cylinder body 8, and a piston 82 is provided in the cavity 81. The outer circumference of the piston 82 is tightly fitted with the surface of the cavity 81, thereby blocking the gas circulation on both sides of the cavity 81. A piston rod 83 is fixedly connected to the center of one end of the piston 82. The end of the piston rod 83 away from the piston 82 passes through the cylinder body 8. A first spring 84 is provided between the piston 82 and the cavity 81. The first spring 84 is arranged on the piston rod 83, and the piston 82 and the piston rod 83 can move in the cylinder body 8; the end of the piston rod 83 away from the piston 82 is fixedly connected to the traction rope 3; the end of the cylinder body 8 away from the piston rod 83 is opened with a cylinder air port 85, and an air pump 9 is fixedly installed on the base 12. The air pump 9 is used to supply compressed air to the cylinder air port 85.

[0027] In this embodiment, the initial position of the piston rod 83 is on one side of the cylinder air port 85. The compressed air enters the cavity 81 through the cylinder air port 85 and pushes the piston 82 to compress the first spring 84 and move to the left, so that the piston rod 83 pushes the traction rope 3. After the compressed air is stopped from being supplied to the cylinder air port 85, the first spring 84 is reset under the action of the elastic force, driving the piston 82 and the piston rod 83 to move to the right, thereby reducing the thrust on the traction rope 3.

[0028] Combine Figure 1 、 Figure 5 In order to convert the thrust into tension, a pulley structure is provided on the base 12, and the pulley structure includes a bracket 7 that plays a fixing and supporting role. Support plates 71 are fixed on both sides of the bracket 7, and the first pulley 5 and the second pulley 6 are respectively provided at the two ends of the top of the support plate 71. The first pulley 5 and the second pulley 6 are both rotatably connected to the support plate 71 through a rotating shaft; a section of the traction rope 3 close to the first pulley 5 passes around the lower end of the first pulley 5 and is connected to the tension meter 4, and a section of the traction rope 3 close to the second pulley 6 passes around the upper end of the second pulley 6 and is fixed to the piston rod 83.

[0029] In this embodiment, support plates 71 are provided at both ends of the bracket 7 in order to leave space inside the bracket 7 so that the piston rod 83 can move between the support plates 71, while increasing the structural strength of the pulley structure to avoid the support plate 71 from breaking when the support plate 71 is used alone.

[0030] Combine Figure 1 、 Figure 5 The height of the second pulley 6 is greater than the height of the upper end of the piston rod 83, so that when the piston rod 83 pushes the traction rope 3, the second pulley 6 can support the traction rope 3, and the height of the bottom end of the support plate 71 is lower than the height of the lower end of the piston rod 83, so that the piston rod 83 is not limited by the bracket 7 when moving between the support plates 71.

[0031] Combine Figure 1 、 Figure 2 、 Figure 4 In order to control the magnitude of the pulling force applied by the traction rope 3 to the traction bow 2, a control structure is further provided on the base 12. The control structure includes a control box 10. A cylindrical sliding cavity 101 is provided in the control box 10. A push rod 102 is provided in the sliding cavity 101. One end of the push rod 102 passes through the control box 10. A pull head 109 is provided at the end of the push rod 102 outside the control box 10. The pull head 109 can facilitate the user to pull the push rod 102. The outer circumference of the push rod 102 is fixed with a first movable plug 103 and a second movable plug 104 in sequence along the axial direction, and the first movable plug 103 and the second movable plug 104 are fixed in sequence along the axial direction. A movable plug 103 is close to the through end of the control box 10, and the outer circumference of the first movable plug 103 and the second movable plug 104 is tightly fitted with the inner wall of the sliding cavity 101. The control box 10 is provided with an air inlet 1011 corresponding to the first movable plug 103, and an exhaust port 1013 corresponding to the second movable plug 104. The control box 10 is provided with an air supply port 1012 between the air inlet 1011 and the exhaust port 1013, and an auxiliary exhaust port 1010 is provided on the side of the air inlet 1011 of the control box 10 away from the air supply port 1012.

[0032] In addition, an air inlet cavity 107 is opened on the inner wall of the sliding cavity 101 at the first movable plug 103, and the width of the air inlet cavity 107 is smaller than the width of the first movable plug 103. An exhaust cavity 108 is opened on the inner wall of the sliding cavity 101 at the second movable plug 104, and the width of the exhaust cavity 108 is smaller than the width of the second movable plug 104. The annular air inlet cavity 107 and the exhaust cavity 108 can form a buffer for the compressed gas passing through, and at the same time make the gas pressure act evenly on the first movable plug 103 and the second movable plug 104, thereby avoiding the situation where the first movable plug 103 and the second movable plug 104 are difficult to push when they are pressurized on one side.

[0033] In addition, a second spring 105 is provided between the side of the first movable piston 103 away from the second movable piston 104 and the sliding cavity 101, and the second spring 105 is sleeved on the push rod 102. A third spring 106 is provided between the side of the second movable piston 104 away from the first movable piston 103 and the sliding cavity 101. The second spring 105 and the third spring 106 are used to reset the push rod 102.

[0034] In this embodiment, in the initial state, the first movable plug 103 and the second movable plug 104 seal the air inlet chamber 107 and the exhaust chamber 108 respectively, and the sliding head 109 is pulled to the left, the first movable plug 103 and the second movable plug 104 move to the left, the second spring 105 is compressed, and the third spring 106 is stretched. At this time, the air inlet 1011 is connected to the sliding cavity 101, and the compressed gas enters the sliding cavity 101 from the air inlet 1011 and leaves from the air supply port 1012; the sliding head 109 is pushed to the right, the first movable plug 103 and the second movable plug 104 move to the right, the second spring 105 is stretched, and the third spring 106 is compressed, and the compressed gas enters the sliding cavity 101 from the air supply port 1012 and leaves from the exhaust port 1013, and the compressed air entering from the air inlet 1011 is discharged from the auxiliary exhaust port 1010; when the pulling force needs to be slowly adjusted, it is only necessary to adjust the distance the push rod 102 is pulled out or pushed.

[0035] Combine Figure 1 、 Figure 2 、 Figure 4 A second pipe 14 is connected between the cylinder air port 85 and the air supply port 1012, and a first pipe 13 is connected between the output end of the air pump 9 and the air inlet 1011. The compressed gas generated by the air pump 9 enters the control structure through the first pipe 13, and then enters the driving structure through the second pipe 14, thereby realizing the connection between the structures.

[0036] Combine Figure 1 、 Figure 2 In order to ensure that the total weight of the device is greater than the pulling force required during treatment, a counterweight 11 is fixedly installed on the base 12. The counterweight 11 is used to increase the weight of the device and can be adjusted.

[0037] The working principle and usage process of the present invention are as follows: when in use, the Kirschner wire 1 is fixed on the patient's limb, and the traction bow 3 is installed on both ends of the Kirschner wire 1, one end of the dynamometer 4 is connected to the middle of the back of the traction bow 3, and the other end is connected to the traction rope 3, and the other end of the traction rope 3 is passed around the bottom end of the first pulley 5 and then around the upper end of the second pulley 6, and finally connected to the piston rod 83 located below the second pulley 6, and at the same time, the traction rope 3 is adjusted to a straight state.

[0038] When the pulling force required for treatment needs to be increased, the air pump 9 is started, and the compressed air enters the air inlet chamber 107 through the air inlet 1011 from the first pipe 13, and the push rod 102 is pulled to the left. The first movable plug 103 and the second movable plug 104 move to the left, and the air inlet chamber 107 is connected with the air supply port 1012. The compressed gas enters the sliding cavity 101 from the air inlet chamber 107, and enters the second pipe 14 from the air supply port 1012, and finally enters the cavity 81 through the cylinder air port 85, and pushes the piston 82 to compress the first spring 84 and move to the left, so that the piston rod 83 pushes The traction rope 3, under the adjustment of the pulley structure, the thrust of the piston rod 83 on the traction rope 3 is converted into the tension of the traction rope 3 on the traction bow 2, thereby playing a traction role on the patient's limbs. By observing the dynamometer 4, when the tension reaches the requirement, the air pump 9 is turned off and the push rod 102 is released. The push rod 102 is reset under the adjustment of the second spring 105 and the third spring 106. The first movable plug 103 and the second movable plug 104 respectively seal the air inlet 1011 and the exhaust port 1013 to keep the pressure in the pushing structure constant, thereby keeping the tension on the traction bow unchanged.

[0039] When it is necessary to reduce the pulling force required for treatment, just push the pull head 109 to the right to move the first movable plug 103 and the second movable plug 104 to the right, so that the air supply port 1012 is connected to the exhaust port 1013, and the compressed gas enters the sliding cavity 101 from the air supply port 1012 and leaves from the exhaust port 1013. At the same time, the compressed air entering from the air inlet 1011 is discharged from the auxiliary exhaust port 1010, thereby reducing the pressure of the gas in the cavity 81, so that the piston rod 83 reduces the thrust on the traction rope 3.

[0040] In summary, the adjustable bone screw traction device is provided with a control box 10, and a sliding cavity 101, an air inlet 1011, an air supply port 1012 and an exhaust port 1013 are opened in the control box 10. At the same time, a push rod 102, a first movable plug 103 and a second movable plug 104 are provided in the sliding cavity 101 to cooperate with the above structure to control the flow path of the compressed gas, thereby controlling the thrust generated by the pushing structure, and then controlling the pulling force on the traction bow. The operation is simple and easy to control, the wear between the structures is low and the failure rate is low, and the structures are independent of each other, which is easy to maintain. By integrating the pushing structure, pulley structure and control structure into the base 12 and providing a counterweight block 11, the device does not require an additional fixed point when in use, and only requires a flat area, which improves the convenience of use of the device.

[0041] It should be noted that, in this document, terms such as "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or apparatus comprising the element.

[0042] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An adjustable bone screw traction device, comprising a Kirschner wire (1), a traction bow (2) and a traction rope (3), characterized in that: Also includes: The Kirschner wire (1) is fixed to the traction ears at both ends of the traction bow (2); the traction rope (3) is provided at the end of the traction bow (2) away from the traction ear; a dynamometer (4) is connected between the traction rope (3) and the traction bow (2); and a base (12) is provided at the lower end of the traction rope (3); A pushing structure, the pushing structure being fixedly arranged on the upper surface of the base (12) and being used for providing a thrust to the traction rope (3); a pulley structure, the pulley structure being fixedly mounted on the upper surface of the base (12), and the pulley structure being used to convert the thrust provided by the propulsion structure to the traction rope (3) into a pulling force on the traction bow (2); A control structure is fixed on the upper surface of the base (12), and is used to adjust the magnitude of the thrust provided by the pushing structure to the traction rope (3).

2. The adjustable bone screw distraction device according to claim 1, characterized in that: The pushing structure includes a cylinder body (8), the cylinder body (8) is fixedly connected to the base (12), a cavity (81) is provided inside the cylinder body (8), a piston (82) is provided in the cavity (81), the outer circumference of the piston (82) is tightly fitted with the surface of the cavity (81), a piston rod (83) is fixedly connected to the center of one end of the piston (82), the end of the piston rod (83) away from the piston (82) passes through the cylinder body (8), a first spring (84) is provided between the piston (82) and the cavity (81), the first spring (84) is sleeved on the piston rod (83), and the piston (82) and the piston rod (83) can move in the cylinder body (8); One end of the piston rod (83) away from the piston (82) is fixedly connected to the traction rope (3); The cylinder body (8) is provided with a cylinder body air port (85) at one end away from the piston rod (83), and an air pump (9) is fixedly mounted on the base (12), and the air pump (9) is used to deliver compressed air to the cylinder body air port (85).

3. The adjustable bone screw distraction device according to claim 1 or 2, characterized in that: The pulley structure comprises a bracket (7), support plates (71) are fixedly provided on both sides of the bracket (7), a first pulley (5) and a second pulley (6) are respectively provided at both ends of the top of the support plate (71), and the first pulley (5) and the second pulley (6) are both rotatably connected to the support plate (71); A section of the traction rope (3) close to the first pulley (5) passes around the lower end of the first pulley (5) and is connected to the dynamometer (4); a section of the traction rope (3) close to the second pulley (6) passes around the upper end of the second pulley (6) and is fixed to the piston rod (83).

4. The adjustable bone screw distraction device according to claim 3, characterized in that: The height of the second pulley (6) is greater than the height of the upper end of the piston rod (83), and the height of the bottom end of the support plate (71) is lower than the height of the lower end of the piston rod (83).

5. The adjustable bone screw distraction device according to claim 1, characterized in that: The control structure comprises a control box (10), a sliding cavity (101) is provided in the control box (10), a push rod (102) is provided in the sliding cavity (101), one end of the push rod (102) passes through the control box (10), a first movable plug (103) and a second movable plug (104) are fixed to the outer circumference of the push rod (102) in sequence along the axial direction, and the first movable plug (103) is close to the through end of the control box (10), and the outer circumferences of the first movable plug (103) and the second movable plug (104) are The control box (10) is tightly fitted with the inner wall of the sliding cavity (101), an air inlet (1011) is provided at a position corresponding to the first movable plug (103), an exhaust port (1013) is provided at a position corresponding to the second movable plug (104), an air supply port (1012) is provided between the air inlet (1011) and the exhaust port (1013), and an auxiliary exhaust port (1010) is provided on a side of the air inlet (1011) of the control box (10) away from the air supply port (1012); An air inlet cavity (107) is provided on the inner wall of the sliding cavity (101) at the first movable plug (103), and the width of the air inlet cavity (107) is smaller than the width of the first movable plug (103); an air exhaust cavity (108) is provided on the inner wall of the sliding cavity (101) at the second movable plug (104), and the width of the air exhaust cavity (108) is smaller than the width of the second movable plug (104); A second spring (105) is provided between the side of the first movable plug (103) away from the second movable plug (104) and the sliding cavity (101), and the second spring (105) is sleeved on the push rod (102). A third spring (106) is provided between the side of the second movable plug (104) away from the first movable plug (103) and the sliding cavity (101).

6. The adjustable bone screw distraction device according to claim 2, characterized in that: A second pipe (14) is connected between the cylinder air port (85) and the air delivery port (1012), and a first pipe (13) is connected between the output end of the air pump (9) and the air inlet (1011).

7. The adjustable bone screw distraction device according to claim 1, characterized in that: A counterweight (11) is fixedly mounted on the base (12), and the counterweight (11) is used to increase the weight of the device.

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