Dedicated distraction device suitable for precise closed reduction of long bone fracture of children

Abstract

The invention discloses a special distraction device suitable for precise closed reduction of long bone fracture of children, and relates to the field of fracture reduction, the special distraction device comprises distraction adjusting mechanisms and an image analysis unit.The distraction adjusting mechanisms comprise connecting plates, spiral magnet rings, magnetorheological fluid and clamping rods, and the distraction adjusting mechanisms are used for the two ends of the fracture position of a patient; the rotation posture of the clamping rod is adjusted according to more than two adjustment strategies to conduct closed reduction on the two ends of the fracture position, and whether the spiral magnet ring is powered on or not is selected in the closed reduction process so as to switch the flowing or curing state of magnetorheological fluid, and whether the placement posture of a closing needle arranged on the clamping rod is instantly fixed or not is selected; compared with a traditional single-shaft traction device, composite correction of a sagittal plane, a coronal plane and rotation can be completed, a magneto-rheological locking system composed of a fixing pin, a spiral magnet ring and magneto-rheological fluid can be automatically locked after being adjusted in place, over-traction injury is avoided, and a user is helped to rapidly fix a reset broken bone in an operation.

Description

Technical Field

[0001] The present invention relates to the technical field of fracture reduction, and in particular to a special distraction device suitable for accurate closed reduction of long bone fractures in children. Background Art

[0002] Children are curious and active, so they are prone to sports injuries or accidents, which can lead to fractures. Fractures usually occur during the critical period of growth and development. The growth and development characteristics of children's bones make the healing process of their fractures different from that of adults. Children's fractures usually have good self-healing ability, but the accuracy of reduction directly affects the quality of fracture healing and subsequent functional recovery. With the development of medical technology, especially the progress of image-guided technology and minimally invasive technology, it has also provided a basis for the development of precise auxiliary reduction devices. In clinical practice, when reducing fractures in children, we often face problems such as inaccurate reduction and poor fracture alignment, which will lead to consequences such as functional impairment and malformation. However, the existing methods or tools for reducing fractures in children require the use of medical forceps to open the broken bones and guide the reduction. However, during the process, multiple clamping or alignment operations are required, which is difficult to operate and causes certain damage to the bones. When fixation is performed using fixation pins, the broken bone is easily affected by the fixation operation and causes secondary dislocation during the fixation process. Moreover, slight dislocation is difficult to detect. Therefore, a device that can effectively assist in reduction is needed to ensure accurate closure of the fracture ends. Summary of the invention

[0003] 1. Technical issues to be resolved In view of the above-mentioned shortcomings of the prior art, the present invention provides a special distraction device suitable for accurate closed reduction of long bone fractures in children, which can effectively solve the problems of the prior art.

[0004] (II) Technical solution To achieve the above objectives, the present invention is implemented through the following technical solutions: The present invention discloses a special distraction device suitable for accurate closed reduction of long bone fractures in children, comprising a distraction adjustment mechanism and an image analysis unit, wherein: The expansion adjustment mechanism includes a connecting plate, a spiral magnet ring, a magnetorheological fluid and a clamping rod. The expansion adjustment mechanism is used at both ends of the patient's fracture, and the rotation posture of the clamping rod is adjusted with more than two adjustment strategies to close and reduce the two ends of the fracture. During the closed reduction process, it is selected whether to connect the current to the spiral magnet ring to switch the flow or solidification state of the magnetorheological fluid, so as to select whether to instantaneously fix the placement posture of the closing needle placed on the clamping rod; The image analysis unit includes a micro servo motor, a monitor, and an analysis module. The image analysis unit is used to obtain an image of the fracture site through the monitor, and the analysis module generates an active displacement instruction for the clamping rod and submits it to the micro servo motor for execution.

[0005] Furthermore, adjustment plates are provided at both the left and right ends of the connecting plate. At one end where the adjustment plates are close to each other, there is a first rotating block. Both ends of the first rotating block are rotatably connected to the inner wall of the adjustment plate. The left end of the right first rotating block is fixedly connected to the right end of the connecting plate. A plug rod is fixedly connected to the right end of the left first rotating block. The plug rod is inserted into the interior of the connecting plate. The top of the connecting plate is rotationally connected by a thread with a fixing pin. One end of the fixing pin is rotatably connected to a trigger block. The trigger block is inserted into the interior of the plug rod. The trigger block is used to fix the plug rod following the movement process of the fixing pin. At one end where the adjustment plates are far from each other, there is a second rotating block. Both ends of the second rotating block are rotatably connected to the inner wall of the adjustment plate. The number of micro servo motors is two, and the two micro servo motors are installed on the surface of the adjustment plate. The output shaft of the micro servo motor is rotatably connected to the front end of the second rotating block.

[0006] Furthermore, a first pole piece is installed at the bottom end of the trigger block, and a second pole piece is installed on the inner wall at the bottom end of the plug rod. The first pole piece is externally connected to a power supply. When the first pole piece and the second pole piece are in contact with each other, an energization trigger mechanism is formed.

[0007] Furthermore, rotating teeth are fixedly connected to the rear ends of the first rotating block and the second rotating block. The bottom ends of the rotating teeth are meshed with a toothed plate. The toothed plate is slidably connected to the adjustment plate. Pistons rods are fixedly connected to one end of the toothed plate. A piston cylinder is sleeved on the surface of the piston rod. Accommodation grooves are formed inside the adjustment plates. One end of the piston cylinder extends into the interior of the accommodation groove. Liquid grooves are evenly formed on the part of the surface of the piston cylinder located inside the accommodation groove. A spiral magnet ring is installed on the inner wall of the accommodation groove. The spiral magnet ring is used to form a magnetic field when energized. The interior of the piston cylinder and the accommodation groove are both filled with magnetorheological fluid.

[0008] Furthermore, shaft rods are rotationally connected by a thread to the ends where the second rotating blocks are far from each other. The number of clamping rods is two groups, with two in each group. The two groups of clamping rods are sleeved on the surface of the shaft rod. Two springs are sleeved on the surface of the shaft rod. One end of each spring is fixedly connected to the inner wall of the clamping rod, and the other end of each spring is fixedly connected to the surface of the shaft rod. Fixing holes are formed at the bottom ends of the clamping rods.

[0009] Furthermore, the analysis module is installed on the surface of the connecting plate, and the monitor is installed at the bottom end of the connecting plate.

[0010] Furthermore, sub - modules are deployed at a lower level of the analysis module, including: An image recognition module, configured to read the real-time intraoperative images recorded by a monitor, and extract the features of both ends of the fracture site at the initial stage and the closed state of both ends of the real-time fracture site; A model training module, configured to obtain a number of historical closed state data of both ends of the fracture site that have passed verification as a first type of standard data, use the position of the corresponding monitor and the rotation angle of the clamping rod as a second type of standard data, construct a prediction model, and perform cross-training with the two types of standard data as samples; A closing prediction module, configured to obtain the real-time position of the current monitor and input it into the trained prediction model, output the corresponding rotation angle of the clamping rod, and generate an operation instruction for the micro servo motor based on the rotation angle of the clamping rod; A verification module, configured to construct a three-dimensional assembly model based on the features of both ends of the fracture site and the current position of the clamping rod, control the clamping rod to perform three-dimensional simulation assembly based on the current operation instruction of the micro servo motor, and score based on the assembly result; A feedback module, configured to feedback the scoring result of the verification module to the management end, and use it as a reference for adjusting the training samples of the model training module.

[0011] Furthermore, the image recognition module and the model training module are interconnected through a wireless network, the model training module and the closing prediction module are interconnected through a wireless network, the closing prediction module and the verification module are interconnected through a wireless network, and the verification module and the feedback module are interconnected through a wireless network.

[0012] (III) Beneficial effects Adopting the technical solution provided by the present invention, compared with the known prior art, it has the following beneficial effects. The fixing pins fixed on the broken bone are clamped by the clamping rod, and the double-end adjustment plate structure is used to cooperate with the rotating block one and the rotating block two to rotate the connecting piece, so as to realize multi-degree-of-freedom adjustment in three-dimensional space for the broken bone. Compared with the traditional single-axis traction device, it can complete sagittal plane, coronal plane and rotational composite correction until the two broken bones are closed. The collaborative design of the magnetorheological locking system composed of the fixing pin, the spiral magnet ring and the magnetorheological fluid is triggered by the contact power-on trigger mechanism of the first pole piece and the second pole piece, and can be automatically locked after the adjustment is in place, avoiding over-traction injury, realizing millisecond-level attitude locking, helping users to quickly fix the reset broken bone during the operation, and improving stability. The model training module uses the verified historical data, and the closed-loop prediction module automatically calculates the optimal rotation angle of the micro servo motor according to the real-time image, so that the fixing pins fixed by the clamping rod can pull the two broken bones to close in the optimal orientation, reducing human error. The 3D simulation of the verification module can predict the results before the actual operation, reducing the number of intraoperative adjustments and shortening the operation time. In addition, the feedback module uses the verification results for model optimization, forming a closed-loop learning system to continuously improve the performance. This is more adaptable to individual differences than static algorithms. At the same time, it reduces radiation exposure, and fewer intraoperative adjustments mean less use of X-rays. Through the design of the shaft rod being threadedly connected to the second rotating block, after the surgical measure of bone fracture calibration is completed by the user, the user can directly rotate the shaft rod, so that the shaft rod tightens the clamping rod, and then the clamping rod drives the fixing pin for long-term fixation, converting the device from an original intraoperative tool to a tool for subsequent long-term auxiliary positioning and growth of broken bones, improving the versatility of the device in this fracture surgery scenario. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention, and those of ordinary skill in the art can obtain other drawings based on these drawings without creative efforts.

[0014] Figure 1 It is the overall three-dimensional structure diagram of the present invention; Figure 2 It is the overall three-dimensional structure diagram of another angle of the present invention; Figure 3 It is the top view sectional structure diagram of the present invention; Figure 4 In the present invention Figure 3 The partial enlarged structure diagram at position A; Figure 5 In the present invention Figure 3 The partial enlarged structure diagram at position B; Figure 6 It is the three-dimensional structure diagram of the first rotating block, rotating teeth, toothed plate and piston rod of the present invention; Figure 7 It is the three-dimensional structure diagram of the shaft rod and the spring of the present invention; Figure 8 It is the side view structure diagram of the shaft rod and the spring of the present invention; Figure 9 It is the module framework schematic diagram of the analysis module of the present invention.

[0015] The numbers in the figure represent, respectively, 1, connecting plate; 2, adjusting plate; 3, plug rod; 4, fixing pin; 5, trigger block; 6, pole piece one; 7, pole piece two; 8, rotating block one; 9, rotating block two; 10, rotating gear; 11, tooth plate; 12, piston cylinder; 13, piston rod; 14, liquid tank; 15, containing tank; 16, spiral magnet ring; 17, magnetorheological fluid; 18, shaft rod; 19, clamping rod; 20, spring; 21, fixing hole; 22, micro servo motor; 23, monitor; 24, analysis module. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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 work are within the scope of protection of the present invention.

[0017] The present invention will be further described below in conjunction with the embodiments. Example

[0018] The embodiment of the present invention is a special distraction device suitable for accurate closed reduction of long bone fractures in children, such as Figures 1-8 As shown, it includes a spreading adjustment mechanism and an image analysis unit, wherein: The expansion adjustment mechanism includes a connecting plate 1, a spiral magnet ring 16, a magnetorheological fluid 17 and a clamp rod 19. The expansion adjustment mechanism is used at both ends of the patient's fracture, and the rotation posture of the clamp rod 19 is adjusted with more than two adjustment strategies to close and reset the two ends of the fracture. During the closed and reset process, it is selected whether to connect the current to the spiral magnet ring 16 to switch the flow or solidification state of the magnetorheological fluid 17, so as to select whether to instantaneously fix the placement posture of the closing needle placed on the clamp rod 19; Adjustment plates 2 are provided at both ends of the connecting plate 1, and a rotating block 8 is provided at one end of the adjusting plates 2 that are close to each other. Both ends of the rotating block 8 are rotatably connected to the inner wall of the adjusting plate 2. The left end of the right rotating block 8 is fixedly connected to the right end of the connecting plate 1, and the right end of the left rotating block 8 is fixedly connected to the plug rod 3, which is inserted into the interior of the connecting plate 1. The top of the connecting plate 1 is rotatably connected to a fixing pin 4 through a thread, and one end of the fixing pin 4 is rotatably connected to a trigger block 5, which is inserted into the interior of the plug rod 3. The trigger block 5 is used to fix the plug rod 3 following the movement of the fixing pin 4. A rotating block 29 is provided at one end of the adjusting plates 2 that are away from each other, and both ends of the rotating block 29 are rotatably connected to the inner wall of the adjusting plate 2. There are two micro servo motors 22, and the two micro servo motors 22 are mounted on the surface of the adjusting plate 2. The output shaft of the micro servo motor 22 is rotatably connected to the front end of the rotating block 29; As Figure 5 and Figure 6 shown, at the rear ends of the first rotating block 8 and the second rotating block 9 are fixedly connected with rotating teeth 10. At the bottom ends of the rotating teeth 10 are meshingly connected with toothed plates 11. The toothed plates 11 are slidably connected with the adjusting plates 2. At one ends of the toothed plates 11 are fixedly connected with piston rods 13. The surfaces of the piston rods 13 are sleeved with piston cylinders 12. Inside the adjusting plates 2 are respectively provided with accommodating grooves 15. One ends of the piston cylinders 12 respectively extend into the interiors of the accommodating grooves 15. On the partial surfaces of the piston cylinders 12 located inside the accommodating grooves 15 are evenly provided with liquid grooves 14. On the inner walls of the accommodating grooves 15 are installed spiral magnet rings 16 which are used to form a magnetic field when electrified. The interiors of the piston cylinders 12 and the accommodating grooves 15 are both filled with magnetorheological fluid 17. The interiors of the piston cylinders 12 and the accommodating grooves 15 are in a closed state to keep the pressure stable; As Figure 1 and Figure 7 shown, at the mutually remote ends of the second rotating block 9 are respectively rotationally connected with shaft rods 18 by threads. The number of the clamping rods 19 is two groups, two in each group. The two groups of clamping rods 19 are both sleeved on the surfaces of the shaft rods 18. On the surfaces of the shaft rods 18 are sleeved with two springs 20. One ends of the springs 20 are respectively fixedly connected with the inner walls of the clamping rods 19. The other ends of the springs 20 are respectively fixedly connected with the surfaces of the shaft rods 18. At the bottom ends of the clamping rods 19 are respectively provided with fixing holes 21 which receive the insertion of fixing pins.

[0019] As a preferred implementation manner in this embodiment, as Figure 3 and Figure 4 shown, at the bottom end of the trigger block 5 is installed a first pole piece 6. On the inner wall at the bottom end of the inserting rod 3 is installed a second pole piece 7. The first pole piece 6 is externally connected to a power source. When the first pole piece 6 and the second pole piece 7 are in contact with each other, an electrified trigger mechanism is formed. The selective connection of the current can effectively control the solidification state of the fluid or colloid, enabling medical staff to instantaneously adjust the fixing state during the closed reduction process and providing better stability.

[0020] Compared with the prior art, through the design of the spreading and adjusting mechanism, it is possible to, according to the specific conditions of the fracture site, achieve more precise closed reduction through various adjustment strategies, adjust according to the individual differences of patients, improve the reduction effect. Through the design of instantaneous fixation, medical staff can quickly fix the position of the closed needle, thereby reducing the error at the fracture end during the reduction process and improving the accuracy of treatment. It can adapt to different types of fractures and is especially optimized for the physiological characteristics of children to ensure that the reduction process is more user-friendly and applicable; Since the device can adjust and fix during the reduction process, it reduces the risk of secondary injury to the fracture area during the reduction, provides higher safety. By simplifying the reduction process and enhancing the flexibility of the device, doctors can perform surgical operations more easily and efficiently, reduce the operation time, and improve the work efficiency. Embodiment

[0021] On other levels, this embodiment also provides an image analysis unit, such as Figure 1 and Figure 9 As shown, the image analysis unit includes a micro servo motor 22, a monitor 23 and an analysis module 24. The image analysis unit is used to obtain the fracture image through the monitor 23. The analysis module 24 generates an active displacement instruction for the clamping rod 19 and submits it to the micro servo motor 22 for execution. The analysis module 24 is installed on the surface of the connecting plate 1, and the monitor 23 is installed at the bottom end of the connecting plate 1.

[0022] As a preferred implementation manner in this embodiment, as Figure 9 shown, the analysis module 24 has sub-modules deployed at a lower level, including: An image recognition module, which is used to read the real-time intraoperative images recorded by the monitor 23 and extract the characteristics of both ends of the fracture at the initial stage and the closed state of both ends of the real-time fracture; A model training module, which is used to obtain a number of historical closed state data of both ends of the fracture that have passed verification as a type of standard data, and use the position of the monitor 23 and the rotation angle of the clamping rod 19 as the second type of standard data to construct a prediction model, and use the two types of standard data as samples for cross-training; A closed state prediction module, which is used to input the real-time position of the current monitor 23 into the trained prediction model, output the corresponding rotation angle of the clamping rod 19, and generate an operation instruction for the micro servo motor 22 based on the rotation angle of the clamping rod 19; A verification module, which is used to construct a three-dimensional assembly model based on the characteristics of both ends of the fracture and the current position of the clamping rod 19, control the clamping rod 19 to perform three-dimensional simulation assembly based on the current operation instruction of the micro servo motor 22, and score based on the assembly result; A feedback module, which feeds back the scoring result of the verification module to the management end and serves as a reference for adjusting the training samples of the model training module; The image recognition module and the model training module are connected through wireless network interaction. The model training module and the closed state prediction module are connected through wireless network interaction. The closed state prediction module and the verification module are connected through wireless network interaction. The verification module and the feedback module are connected through wireless network interaction.

[0023] Compared with the prior art, by combining image analysis and closed state prediction, the device can obtain the imaging information of the fracture in real time, perform data analysis and model training. Through the intelligent scoring and adjustment mechanism, the success rate and efficiency of reduction can be greatly improved. It can real-time feedback the effect of fracture reduction and make corresponding adjustments. Through dynamic feedback, medical staff can make necessary interventions according to specific situations to ensure that the reduction process meets the needs of individual patients as much as possible; Not only can historical data be used for monitoring, but data can also be updated in real time during the operation and the model can be optimized. By constructing a three-dimensional assembly model and conducting real-time simulation, medical staff can visually observe and evaluate the reduction effect, and make further adjustments according to the simulation results, which provides a scientific basis for optimizing the surgical plan.

[0024] Working principle: In the specific implementation of the present invention, the user needs to fix four fixing pins in pairs to two broken bones, and then pass them through the fixing holes 21 at the bottom end of the clamping rod 19. During this process, the user needs to press inward or expand outward the clamping rod 19, so that the clamping rod 19 rotates on the surface of the shaft rod 18 and stretches the spring 20. Through the resilience of the spring 20 and the additional pressure applied by the user, the movement of the broken bone is controlled by two groups of clamping rods 19. During the movement, the first rotating block 8 and the second rotating block 9 rotate clockwise or counterclockwise on the surface of the adjusting plate 2, and the inserting rod 3 moves left or right inside the connecting plate 1 to adapt to the correction and alignment path of the broken bone. As the first rotating block 8 and the second rotating block 9 move, they synchronously drive the rotating teeth 10 to rotate, and then drive the toothed plate 11 to displace. The toothed plate 11 drives the piston rod 13 to move left or right inside the piston cylinder 12. Under the action of pressure, the magnetorheological fluid 17 in the accommodating groove 15 is sucked into or re-discharged by the piston cylinder 12. When the broken bone is closed to the appropriate position, the user can rotate the fixing pin 4. Under the action of the thread, the fixing pin 4 rotates on the trigger block 5, and the inserting rod 3 restricts the movement track of the trigger block 5. The trigger block 5 is pushed by the fixing pin 4 to drive the first pole piece 6 to contact the second pole piece 7. The user can supply power to the first pole piece 6 in advance. When the first pole piece 6 is connected to the second pole piece 7, power is supplied to the spiral magnet coil 16 to generate a strong magnetic field, so that the magnetorheological fluid 17 in the accommodating groove 15 is solidified, thereby preventing the piston rod 13 from moving inside the piston cylinder 12, and then completing the fixation of the first rotating block 8 and the second rotating block 9. The user can complete the associated surgical operation. After the operation is completed, the user can remove the clamping rod 19 from the fixing pin. After the surgical measures for broken bone calibration are completed, the user can directly rotate the shaft rod 18 to tighten the clamping rod 19 by the shaft rod 18, so that the clamping rod 19 drives the fixing pin for long-term fixation, converting the device from the original intraoperative tool into a tool for subsequent long-term auxiliary positioning and growth of the broken bone; the clamping rod 19 can be designed as a segmented splicing structure, so that the handheld part can be removed before long-term fixation, reducing its exposed length by half. During the docking of the broken bone, the monitor 23 records the intraoperative images in real time, analyzes them through the analysis module 24, generates a correction instruction for the current broken bone docking state, converts the correction instruction into a rotation instruction for the micro servo motor 22. After receiving the rotation instruction, the micro servo motor 22 controls the rotation of the second rotating block 9, and then drives the angle of the broken bone fixed by the fixing pin on the clamping rod 19 to be adjusted until the two broken bones are fully closed.

[0025] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A special distraction device suitable for accurate closed reduction of long bone fractures in children, characterized in that: It includes a spreading adjustment mechanism and an image analysis unit, wherein: The expansion adjustment mechanism comprises a connecting plate (1), a spiral magnet ring (16), a magnetorheological fluid (17) and a clamp rod (19). The expansion adjustment mechanism is used at two ends of a patient's fracture site, and uses more than two adjustment strategies to adjust the rotational posture of the clamp rod (19) to close and reset the two ends of the fracture site. During the closed and reset process, it is selected whether to connect the current to the spiral magnet ring (16) to switch the flow or solidification state of the magnetorheological fluid (17) to select whether to instantaneously fix the placement posture of the closing needle placed on the clamp rod (19); the image analysis unit comprises a micro servo motor (22), a monitor (23) and an analysis module (24). The image analysis unit is used to obtain an image of the fracture site through the monitor (23), and the analysis module (24) generates an active displacement instruction of the clamp rod (19) and submits it to the micro servo motor (22) for execution.

2. A special distraction device suitable for accurate closed reduction of long bone fractures in children according to claim 1, characterized in that: The left and right ends of the connecting plate (1) are both provided with adjustment plates (2), and the ends of the adjusting plates (2) that are close to each other are both provided with rotating blocks (8), and both ends of the rotating blocks (8) are rotatably connected to the inner wall of the adjustment plate (2), the left end of the rotating block (8) on the right side is fixedly connected to the right end of the connecting plate (1), and the right end of the rotating block (8) on the left side is fixedly connected to an insertion rod (3), and the insertion rod (3) is inserted into the interior of the connecting plate (1), and the top end of the connecting plate (1) is rotatably connected to a fixing pin (4) through a thread, and one end of the fixing pin (4) is rotatably connected to the inner wall of the adjusting plate (2). A trigger block (5) is provided, the trigger block (5) being inserted into the interior of the insertion rod (3), the trigger block (5) being used to fix the insertion rod (3) following the movement of the fixing pin (4), a rotating block 2 (9) being provided at one end of the adjustment plate (2) which is away from each other, both ends of the rotating block 2 (9) being rotatably connected to the inner wall of the adjustment plate (2), the number of the micro servo motors (22) being two, the two micro servo motors (22) being mounted on the surface of the adjustment plate (2), the output shaft of the micro servo motor (22) being rotatably connected to the front end of the rotating block 2 (9).

3. A special distraction device suitable for accurate closed reduction of long bone fractures in children according to claim 2, characterized in that: A pole piece 1 (6) is installed at the bottom end of the trigger block (5), and a pole piece 2 (7) is installed on the inner wall of the bottom end of the plug rod (3). The pole piece 1 (6) is externally connected to a power source, and when the pole piece 1 (6) and the pole piece 2 (7) are in contact with each other, an energized trigger mechanism is formed.

4. A special distraction device suitable for accurate closed reduction of long bone fractures in children according to claim 2, characterized in that: The rear ends of the rotating block 1 (8) and the rotating block 2 (9) are both fixedly connected with rotating teeth (10), the bottom ends of the rotating teeth (10) are meshingly connected with a tooth plate (11), the tooth plate (11) is slidably connected to the adjustment plate (2), one end of the tooth plate (11) is fixedly connected with a piston rod (13), the surface of the piston rod (13) is sleeved with a piston cylinder (12), the adjustment plate (2) is provided with a receiving groove (15), one end of the piston cylinder (12) extends into the inside of the receiving groove (15), a liquid groove (14) is evenly provided on a part of the surface of the piston cylinder (12) located inside the receiving groove (15), a spiral magnet ring (16) is installed on the inner wall of the receiving groove (15), the spiral magnet ring (16) is used to form a magnetic field when power is supplied, and the inside of the piston cylinder (12) and the receiving groove (15) are filled with magnetorheological fluid (17).

5. A special distraction device suitable for accurate closed reduction of long bone fractures in children according to claim 2, characterized in that: The ends of the two rotating blocks (9) that are away from each other are both connected to the shaft (18) through a threaded connection. The number of the clamping rods (19) is two groups, two in each group. The two groups of clamping rods (19) are both sleeved on the surface of the shaft (18). The surface of the shaft (18) is sleeved with two springs (20), one end of the spring (20) is fixedly connected to the inner wall of the clamping rod (19), and the other end of the spring (20) is fixedly connected to the surface of the shaft (18). The bottom end of the clamping rod (19) is provided with a fixing hole (21).

6. A special distraction device suitable for accurate closed reduction of long bone fractures in children according to claim 1, characterized in that: The analysis module (24) is mounted on the surface of the connecting plate (1), and the monitor (23) is mounted on the bottom end of the connecting plate (1).

7. A special distraction device suitable for accurate closed reduction of long bone fractures in children according to claim 1, characterized in that: The analysis module (24) is deployed with submodules at the lower level, including: an image recognition module for reading the real-time intraoperative image recorded by the monitor (23), extracting the initial features of the two ends of the fracture and the real-time closure state of the two ends of the fracture; a model training module for obtaining a number of verified historical closure state data of the two ends of the fracture as a first type of standard data, taking the position of the corresponding monitor (23) and the rotation angle of the clamp rod (19) as a second type of standard data, constructing a prediction model, and using the two types of standard data as samples for cross-training; a closure prediction module for obtaining the current monitor ( 23) The real-time position of the patient is input into the trained prediction model, and the corresponding rotation angle of the clamp rod (19) is output, and the operation instructions of the micro servo motor (22) are generated based on the rotation angle of the clamp rod (19); a verification module is used to construct a three-dimensional assembly model based on the features at both ends of the fracture and the current position of the clamp rod (19), control the clamp rod (19) to perform three-dimensional simulated assembly based on the operation instructions of the current micro servo motor (22), and score based on the assembly results; a feedback module feeds back the scoring results of the verification module to the management end, and serves as a reference for adjusting the training samples of the model training module.

8. A special distraction device suitable for accurate closed reduction of long bone fractures in children according to claim 7, characterized in that: The image recognition module is interactively connected to the model training module through a wireless network, the model training module is interactively connected to the closure prediction module through a wireless network, the closure prediction module is interactively connected to the verification module through a wireless network, and the verification module is interactively connected to the feedback module through a wireless network.

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