A children's orthopedic traction frame

By designing side-by-side support belts and rotating mechanisms, combined with the cooperation of the air pressure cylinder and the sink, the problem of poor fixation of the pediatric orthopedic traction frame when fixed with one hand or single leg is solved, and effective traction and blood circulation of the fractured parts of the children is achieved. Improved recovery speed and adaptability.

CN118000997BActive Publication Date: 2025-01-03THE SEVENTH MEDICAL CENTER OF PLA GENERAL HOSPITAL
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Patent Information

Application Number
CN202410236809.8
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-03-01
Publication Date
2025-01-03
Estimated Expiration
2044-03-01

AI Technical Summary

Technical Problem

Due to the activeness of children, the fracture site is slow to recover, and existing traction frames are difficult to effectively fix when fixed with one hand or one leg.

Method used

A children's orthopedic traction frame is designed, adopting side-by-side support belts and rotating mechanisms. Through the cooperation of the movable shell and the movable rod, the direction of the traction mechanism is kept unchanged, and through the cooperation of the pneumatic cylinder and the sink, the tension and height adjustment are enhanced. Adapt to different bed heights and children's activities.

Benefits of technology

Effectively fix the fracture site of children, reduce slow recovery caused by activity, improve blood circulation, increase fracture recovery, and adapt to hospital beds of different heights.

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Abstract

The present invention provides a pediatric orthopedic traction frame, comprising a base, a support mechanism, which is fixedly mounted on the base; a rotating mechanism, which is fixedly mounted on the support mechanism and comprises a support block, a connecting block and a movable shell; a linkage assembly, which is movably mounted on the rotating mechanism; a traction mechanism, which is fixedly mounted on the linkage assembly and can be rotated through the linkage assembly; the linkage assembly comprises a rotating block 1, which is movably assembled inside the movable shell, and a rotating block 2 is fixedly connected to the bottom of the rotating block 1. The present invention sets two side-by-side support belts, so that when a child has fractures in two parts, the fractured parts can be pulled, and when the movable shell rotates, the traction mechanism can keep its direction unchanged, so that the front and rear of the fractured part can be pulled, and at the same time, a good fixing effect is achieved, so that the fractured part will not recover slowly due to the child's random activities.
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Description

Technical Field

[0001] The invention relates to the technical field of medical devices, and in particular to a pediatric orthopedic traction frame. Background Art

[0002] Orthopedics is one of the most common departments in major hospitals. When a person suffers from serious trauma such as tibia and fibula fractures, shaft fractures, pelvic fractures or hip dislocations, traction is a commonly used treatment method in orthopedics. A traction frame is set up next to the bed, and the traction force on the calcaneus is used to relieve muscle tension and strong contraction, thereby achieving the effect of correction and reduction.

[0003] The traction frame is generally composed of bone needles, a traction bow, a traction rope, a traction frame and a traction weight. During traction, one end of the traction rope is connected to the traction weight, and the other end of the traction rope is connected to the traction bow and the bone needle. The bone needle is fixed to the affected part, and the traction weight is used to provide traction. However, since the bone needles are generally installed side by side, it is relatively easy to fix both hands or hands and feet at the same time. However, when only one hand or leg needs to be fixed, since children are more active, the fracture site may recover slowly due to random activities. Therefore, the present application provides a pediatric orthopedic traction frame to meet the needs. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a pediatric orthopedic traction frame to solve the problem that children are more active and thus fracture sites may recover slowly.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] A pediatric orthopedic traction frame comprises a base, a supporting mechanism fixedly mounted on the base; a rotating mechanism fixedly mounted on the supporting mechanism and comprising a supporting block, a connecting block and a movable shell; a linkage assembly movably mounted on the rotating mechanism; a traction mechanism fixedly mounted on the linkage assembly and capable of rotating through the linkage assembly; the linkage assembly comprises a rotating block 1, the rotating block 1 being movably assembled inside the movable shell, a rotating block 2 being fixedly connected to the bottom of the rotating block 1, a movable rod being hinged on the rotating block 1, and an end of the movable rod away from the rotating block 1 being hinged to the connecting block.

[0007] Optionally, the supporting mechanism includes a column, a lifting column, a lifting block and a supporting plate, the column is fixedly connected to the base, the lifting column is movably assembled inside the column, the top of the lifting column passes through the column, the lifting block is movably installed inside the lifting column, and the supporting plate is fixedly connected to the lifting block.

[0008] Optionally, the support block is fixedly assembled inside the support plate, the connection block is fixedly connected inside the support block, and the movable shell is movably assembled outside the support block and is slidably connected to the support plate.

[0009] Optionally, the traction mechanism includes a mounting platform, a roller, a load-bearing belt and a support belt. The mounting platform is fixedly mounted on the bottom of the rotating block 2, the roller is movably mounted inside the mounting platform, the load-bearing belt is slidably mounted on the roller, and the support belt is sewn on the load-bearing belt.

[0010] Optionally, a fixing plate is fixedly installed on the outside of the lifting column, a water tank is fixedly installed on the inside of the fixing plate, a piston block is slidably installed inside the water tank, a pull rope is fixedly connected to the inside of the piston block, and the other end of the pull rope is fixedly connected to the lifting block.

[0011] Optionally, a water tank is fixedly mounted on the top of the base, a pneumatic cylinder is fixedly mounted on the top of the water tank, a piston plate is slidably mounted inside the water tank, and the pneumatic cylinder and the piston plate are fixedly connected.

[0012] Optionally, a valve 1 connected to the interior of the water tank is fixedly mounted on the water tank, a water supply pipe is fixedly connected to the valve 1 and connected to the valve, and the other end of the water supply pipe is fixedly connected to the interior of the water tank.

[0013] Optionally, the water tank is fixedly equipped with a valve 2 connected thereto, the valve 2 is fixedly connected to a drain pipe connected to the interior thereof, and the other end of the drain pipe is fixedly connected to the water tank and connected to the interior thereof.

[0014] Optionally, a valve three connected thereto is fixedly mounted on the right end of the column, a connecting pipe connected thereto is fixedly connected to the valve three, and the other end of the connecting pipe is fixedly connected to and connected with the water tank.

[0015] Optionally, a mounting block is fixedly connected to the interior of the water tank, a pull rod is movably installed inside the mounting block, a water stopper is fixedly connected to the bottom of the pull rod, and the water stopper is movably assembled inside the piston block.

[0016] Compared with the prior art, the present invention has at least the following beneficial effects:

[0017] In the above scheme, by setting two side-by-side support belts, when a child has two fractures, the fractured parts can be pulled, and when the movable shell rotates, the movable rod will pull the rotating block to rotate it, so that the traction mechanism can maintain the direction unchanged and be arranged vertically, so that the front and back of the fractured part can be pulled, and at the same time a good fixation effect can be achieved, so that the fractured part will not recover slowly due to the child's random activities.

[0018] By setting a pull rope to pull the lifting block, the more water source is stored in the water tank, the heavier the weight of the piston block and the water source will be, so the pulling of the pull rope will increase. When the pulling force of the pull rope increases, more weight of the lifting block and the support belt will be offset until it can be pulled upward. Therefore, it is easier for children to move the fracture site, thereby allowing blood circulation to be unobstructed and increasing the speed of recovery.

[0019] A pneumatic cylinder is provided to push a piston plate to squeeze the water source inside the water tank, thereby increasing the pressure of the water source, so that the water source can enter the interior of the column through a connecting pipe and then through an opening and valve three. The water source can lift the lifting column upward, thereby increasing the height of the traction mechanism to accommodate children lying on beds of different heights. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which are incorporated herein and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, further serve to explain the principles of the invention and to enable those skilled in the relevant art to make and use the invention.

[0021] Figure 1 This is a schematic diagram of the three-dimensional structure of a pediatric orthopedic traction frame;

[0022] Figure 2 It is a schematic diagram of the cross-sectional three-dimensional structure inside the column;

[0023] Figure 3 It is a schematic diagram of the cross-sectional three-dimensional structure inside the movable shell;

[0024] Figure 4 It is a schematic diagram of the three-dimensional structure of the linkage component;

[0025] Figure 5 It is a schematic diagram of the cross-sectional three-dimensional structure of the lifting column;

[0026] Figure 6 It is a schematic diagram of the cross-sectional three-dimensional structure inside the water tank;

[0027] Figure 7 It is a schematic diagram of the cross-sectional three-dimensional structure inside the water tank;

[0028] Figure 8 It is a schematic diagram of the cross-sectional three-dimensional structure inside the lifting block.

[0029] [reference numerals]

[0030] 1. Base; 2. Support mechanism; 201. Column; 202. Lifting column; 203. Lifting block; 204. Support plate; 3. Rotating mechanism; 301. Support block; 302. Connecting block; 303. Movable shell; 4. Linkage assembly; 401. Rotating block one; 402. Rotating block two; 403. Movable rod; 5. Traction mechanism; 501. Mounting table; 502. Roller; 503. Load-bearing belt; 504. Support belt; 601. Fixed plate; 602. Sink; 603. Piston block; 604. Pull rope; 701. Water tank; 702. Pneumatic cylinder; 703. Piston plate; 801. Valve one; 802. Water supply pipe; 803. Valve two; 804. Drain pipe; 805. Valve three; 806. Connecting pipe; 901. Mounting block; 902. Pull rod; 903. Water stopper.

[0031] As shown in the figure, in order to clearly implement the structure of the embodiment of the present invention, specific structures and devices are marked in the figure, but this is only for illustrative purposes and is not intended to limit the present invention to the specific structure, device and environment. According to specific needs, ordinary technicians in this field can adjust or modify these devices and environments. DETAILED DESCRIPTION

[0032] The following is a detailed description of a pediatric orthopedic traction frame provided by the present invention in conjunction with the accompanying drawings and specific embodiments. At the same time, it is explained here that in order to make the embodiments more detailed, the following embodiments are the best and preferred embodiments, and those skilled in the art may also adopt other alternatives to implement some known technologies; and the accompanying drawings are only for a more specific description of the embodiments, and are not intended to specifically limit the present invention.

[0033] It should be noted that the references to "one embodiment", "an embodiment", "an exemplary embodiment", "some embodiments" and the like in the specification indicate that the embodiments described may include specific features, structures or characteristics, but not every embodiment may include the specific features, structures or characteristics. In addition, when a specific feature, structure or characteristic is described in conjunction with an embodiment, it should be within the knowledge of a person skilled in the art to implement such feature, structure or characteristic in conjunction with other embodiments (whether or not explicitly described).

[0034] In general, a term can be understood, at least in part, from its use in context. For example, depending, at least in part, on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in the singular sense, or can be used to describe a combination of features, structures, or characteristics in the plural sense. Additionally, the term "based on" can be understood as not necessarily intended to convey an exclusive set of factors, but can instead, depending, at least in part, on the context, allow for the presence of other factors that are not necessarily explicitly described.

[0035] It will be understood that the meanings of “on,” “over,” and “above” in the present invention should be interpreted in the broadest manner, so that “on” not only means “directly on” something, but also includes the meaning of being “on” something with intervening features or layers therebetween, and “on” or “over” not only means “on” or “above” something, but also includes the meaning of being “on” or “above” something with no intervening features or layers therebetween.

[0036] Additionally, spatially relative terms such as "under," "beneath," "lower," "above," "upper," and the like may be used herein for descriptive convenience to describe the relationship of one element or feature to another element or features, as shown in the accompanying drawings. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. The device may be oriented in other ways, and the spatially relative descriptors used herein may be similarly interpreted accordingly.

[0037] like Figures 1 to 8 As shown, an embodiment of the present invention provides a pediatric orthopedic traction frame, including a base 1, and also including a support mechanism 2, which is fixedly installed on the base 1; a rotating mechanism 3, which is fixedly installed on the supporting mechanism 2 and includes a supporting block 301, a connecting block 302 and a movable shell 303; a linkage assembly 4, which is movably installed on the rotating mechanism 3; a traction mechanism 5, which is fixedly installed on the linkage assembly 4 and can be rotated by the linkage assembly 4; the linkage assembly 4 includes a rotating block 1 401, the rotating block 1 401 is movably assembled inside the movable shell 303, the bottom of the rotating block 1 401 is fixedly connected to a rotating block 2 402, the rotating block 1 401 is hinged with a movable rod 403, and the movable rod 403 is away from One end of the rotating block 401 is hinged to the connecting block 302. By rotating the rotating block 401 and the rotating block 2 402, the traction mechanism 5 as a whole can be rotated. When the movable shell 303 rotates ninety degrees, the rotating block 401 and the rotating block 2 402 as a whole will move with the rotation of the movable shell 303. Since the movable rod 403 is hinged to the connecting block 302, and the movable rod 403 is hinged to the rotating block 1 401, when the rotating block 1 401 moves, the movable rod 403 will pull the rotating block 1 401 to rotate it, and it rotates exactly ninety degrees, so that the traction mechanism 5 can maintain its direction unchanged, which is convenient for orthopedic traction for children.

[0038] like Figure 2 and Figure 3As shown, the support mechanism 2 includes a column 201, a lifting column 202, a lifting block 203 and a support plate 204. The column 201 is fixedly connected to the base 1, and the lifting column 202 is movably assembled inside the column 201. The top of the lifting column 202 passes through the column 201, and the lifting block 203 is movably installed inside the lifting column 202. The support plate 204 is fixedly connected to the lifting block 203. The lifting column 202 can be limited by the column 201, so that the lifting column 202 can only move upward or downward in the vertical direction. When the lifting column 202 moves upward, the height of the traction mechanism 5 can be increased, so that it can adapt to children lying on beds of different heights, and the lifting column 202 also limits the lifting block 203, so that the lifting block 203 and the support plate 204 can only move up and down. The movement of the lifting block 203 and the support plate 204 enables the fracture site of the child to move, thereby stimulating blood circulation and accelerating recovery.

[0039] like Figure 3 As shown, the support block 301 is fixedly assembled inside the support plate 204, the connecting block 302 is fixedly connected to the inside of the support block 301, and the movable shell 303 is movably assembled on the outside of the support block 301 and is slidably connected to the support plate 204. The movable shell 303 can be supported and limited by the connecting block 302, so that the movable shell 303 can only rotate around the support block 301. When the movable shell 303 rotates, its direction will change. Therefore, when the column 201 is located next to the bed, the movable shell 303 will change from horizontal to vertical, and the two traction mechanisms 5 will also be arranged along the length direction of the bed.

[0040] like Figure 4 As shown, the traction mechanism 5 includes a mounting platform 501, a roller 502, a weight belt 503 and a support belt 504. The mounting platform 501 is fixedly mounted on the bottom of the rotating block 402, and the roller 502 is movably mounted inside the mounting platform 501. The weight belt 503 is slidably assembled on the roller 502, and the support belt 504 is sewn on the weight belt 503. The weight belt 503 and the support belt 504 form a whole so that it cannot fall off the roller 502, and the inside of the support belt 504 can be placed on the injured part of the child's bones, so as to pull the injured part, which can relieve muscle tension and strong contraction, and achieve the effect of correction and reduction. The two support belts 504 can pull the two legs or hands of the child at the same time, and when the rotating block 402 rotates, the two support belts 504 will pull two positions of an injured part front and back.

[0041] like Figure 7 and Figure 8As shown, a fixing plate 601 is fixedly installed on the outside of the lifting column 202, a water tank 602 is fixedly installed on the inside of the fixing plate 601, a piston block 603 is slidably installed on the inside of the water tank 602, a pull rope 604 is fixedly connected to the inside of the piston block 603, and the other end of the pull rope 604 is fixedly connected to the lifting block 203. The water source can be sealed by the piston block 603, so that the water source above the piston block 603 in the water tank 602 cannot flow under the piston block 603, and the piston block 603 can move inside the water tank 602. When water is injected above the piston block 603, it will press the piston block 603, and the piston block 603 will pull the lifting block 203 through the pull rope 604, thereby offsetting the overall weight of the lifting block 203 and the support plate 204. By injecting more water, the lifting block 203 and the support plate 204 can be moved upward more easily as a whole.

[0042] like Figure 6 As shown, a water tank 701 is fixedly installed on the top of the base 1, and a pneumatic cylinder 702 is fixedly installed on the top of the water tank 701. A piston plate 703 is slidably installed inside the water tank 701. The pneumatic cylinder 702 and the piston plate 703 are fixedly connected. The water source stored in the water tank 701, when the pneumatic cylinder 702 is running, will cause the piston plate 703 to move downward, thereby squeezing the water source inside the water tank 701, increasing the pressure of the water source inside the water tank 701, so that the water source can be injected into the interior of the water tank 602, or enter the interior of the column 201.

[0043] like Figure 6 and Figure 7 As shown, the water tank 701 is fixedly equipped with a valve 801 connected to the interior thereof, and a water supply pipe 802 is fixedly connected to the valve 801 and is connected to the valve 801. The other end of the water supply pipe 802 is fixedly connected to the interior of the water tank 602 and is controlled by the valve 801. When the valve 801 is in an open state, the water source in the water tank 701 in a high-pressure state can flow into the interior of the water supply pipe 802 through the valve 801, and then flow into the interior of the water tank 602 through the water supply pipe 802, thereby providing downward pressure for the piston block 603. When the pressure is greater than the weight of the lifting block 203 and the support plate 204 as a whole, the lifting block 203 and the support plate 204 will be pulled as a whole, thereby making it more convenient for children to move the injured parts of their bodies during sports, thereby relieving muscle tension and strong contraction.

[0044] like Figure 7 and Figure 8As shown, the water tank 701 is fixedly equipped with a valve 2 803 connected thereto, and the valve 2 803 is fixedly connected to a drain pipe 804 connected to the interior thereof, and the other end of the drain pipe 804 is fixedly connected to the water tank 602 and is internally connected, when the water source inside the water tank 602 and located above the piston block 603 passes through the piston block 603, it can flow into the interior of the drain pipe 804, and when the piston plate 703 moves upward so that the water tank 701 is in a low-pressure state, the valve 2 803 is opened, which will allow the water source inside the drain pipe 804 to flow back to the interior of the water tank 701, thereby replenishing the water source inside the water tank 701.

[0045] like Figure 2 As shown, the right end of the column 201 is fixedly equipped with a valve three 805 connected thereto, and the valve three 805 is fixedly connected to a connecting pipe 806 connected thereto, and the other end of the connecting pipe 806 is fixedly connected and connected to the water tank 701. When the valve three 805 is in an open state, the high-pressure water source in the water tank 701 can enter the interior of the column 201 through the valve three 805 and the connecting pipe 806, thereby pushing the lifting column 202 to move, so that it can adapt to children lying on beds of different heights.

[0046] like Figure 7 As shown, the interior of the water tank 602 is fixedly connected to a mounting block 901, and a pull rod 902 is movably installed inside the mounting block 901. A water stopper 903 is fixedly connected to the bottom of the pull rod 902. The water stopper 903 is movably assembled inside the piston block 603. The piston block 603 can be closed by the water stopper 903, so that the water source above the piston block 603 cannot fall through the interior thereof. When the water stopper 903 moves upward and disengages from the interior of the piston block 603, the water source above the piston block 603 can fall through the piston block 603, thereby replenishing the water source inside the water tank 701 through the drain pipe 804.

[0047] The working principle provided by the present invention is that when valve three 805 is opened and valve one 801 and valve two 803 are closed, the movement of the pneumatic cylinder 702 can increase the pressure inside the water tank 701 through the piston plate 703, so that the water source inside the water tank 701 enters the interior of the column 201 through valve three 805 and the connecting pipe 806, thereby causing the lifting column 202 to move upward, and the medical staff can adjust it according to the height of the bed. When the adjustment is completed, the valve three 805 is closed so that the water source will not flow back and cause the height of the lifting column 202 to drop. Then, when the injured part of the child is one, it is necessary to rotate the movable shell 303, and the movable shell 303 rotates ninety degrees, and the whole of the rotating block one 401 and the rotating block two 402 will move with the rotation of the movable shell 303, and when the rotating block one 401 moves, the movable rod 403 will pull the rotating block one 401 to rotate it ninety degrees, so that the traction mechanism 5 can maintain the direction unchanged, and the injured fracture part of the child can be placed on the support belt 504.

[0048] Then, the operator can open valve 1 801 and move the piston plate 703 downward again through the pneumatic cylinder 702, so that the water source can be injected into the interior of the water tank 602 through valve 1 801 and the water supply pipe 802. The more water sources stored in the water tank 602, the greater the weight of the piston block 603 and the water source as a whole will be, thereby increasing the pulling of the pull rope 604. When the pulling force of the pull rope 604 increases, more of the weight of the lifting block 203 and the support belt 504 as a whole will be offset, making it easier to move. When the medical staff pulls the pull rod 902 upward, the water stopper 903 will be separated from the interior of the piston block 603, so the water source above the piston block 603 can move to its bottom, and when the piston plate 703 moves upward, the opening of valve three 805 will cause the water source inside the column 201 to flow back to the interior of the water tank 701, and when valve two 803 is opened, the water source inside the water tank 602 will flow back through the drain pipe 804.

[0049] The present invention covers any substitution, modification, equivalent method and scheme made on the essence and scope of the present invention. In order to make the public have a thorough understanding of the present invention, specific details are described in detail in the following preferred embodiments of the present invention, but those skilled in the art can fully understand the present invention without the description of these details. In addition, in order to avoid unnecessary confusion about the essence of the present invention, well-known methods, processes, procedures, components and circuits are not described in detail.

[0050] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A pediatric orthopedic traction frame, comprising a base, characterized in that: It also includes a supporting mechanism, which is fixedly mounted on the base; a rotating mechanism, which is fixedly mounted on the supporting mechanism and includes a supporting block, a connecting block and a movable shell; Linkage assembly, movably mounted on the rotating mechanism; The traction mechanism is fixedly mounted on the linkage assembly and can be rotated through the linkage assembly; The linkage assembly comprises a rotating block 1, the rotating block 1 is movably assembled inside the movable shell, the bottom of the rotating block 1 is fixedly connected to the rotating block 2, the rotating block 1 is hinged with a movable rod, and the end of the movable rod away from the rotating block 1 is hinged to the connecting block; The support mechanism comprises a column, a lifting column, a lifting block and a support plate, wherein the column is fixedly connected to the base, the lifting column is movably mounted inside the column, the top of the lifting column passes through the column, the lifting block is movably mounted inside the lifting column, and the support plate is fixedly connected to the lifting block; The support block is fixedly assembled inside the support plate, the connection block is fixedly connected inside the support block, and the movable shell is movably assembled outside the support block and is slidably connected to the support plate; A fixing plate is fixedly installed on the outside of the lifting column, a water tank is fixedly installed on the inside of the fixing plate, a piston block is slidably installed inside the water tank, a pull rope is fixedly connected to the inside of the piston block, and the other end of the pull rope is fixedly connected to the lifting block; A water tank is fixedly installed on the top of the base, a pneumatic cylinder is fixedly installed on the top of the water tank, a piston plate is slidably mounted inside the water tank, and the pneumatic cylinder and the piston plate are fixedly connected; The water tank is fixedly provided with a valve 1 connected to the interior thereof, the valve 1 is fixedly connected with a water supply pipe and connected thereto, the other end of the water supply pipe is fixedly connected to the upper end of the water tank, when the upper end of the piston block is injected with water, downward pressure is provided to the piston block, when the pressure is greater than the weight of the lifting block and the support plate as a whole, the lifting block and the support plate will be pulled to move upward as a whole; The water tank is fixedly provided with a second valve connected thereto, the second valve is fixedly connected with a drainage pipe connected to the interior thereof, and the other end of the drainage pipe is fixedly connected to the water tank and connected to the interior thereof; The right end of the column is fixedly equipped with a valve three connected thereto, the valve three is fixedly connected with a connecting pipe connected thereto, and the other end of the connecting pipe is fixedly connected and connected to the water tank; A mounting block is fixedly connected inside the water tank, a pull rod is movably installed inside the mounting block, a water stopper is fixedly connected to the bottom of the pull rod, and the water stopper is movably assembled inside the piston block.

2. The pediatric orthopedic traction frame according to claim 1, characterized in that: The traction mechanism includes a mounting platform, a roller, a load-bearing belt and a support belt. The mounting platform is fixedly mounted on the bottom of the rotating block 2, the roller is movably mounted inside the mounting platform, the load-bearing belt is slidably mounted on the roller, and the support belt is sewn on the load-bearing belt.