Traction frame of the Braun orthopedic traction apparatus
By designing a Blanc-style orthopedic traction architecture with pulley blocks working in tandem, precise adjustment of traction height and angle is achieved, solving the problems of high traction difficulty and unstable traction force direction in existing technologies, and improving traction effect and safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- 久久艳阳医疗科技(上海)有限公司
- Filing Date
- 2026-04-03
- Publication Date
- 2026-05-29
AI Technical Summary
Existing Blanc orthopedic traction devices present significant challenges in adjusting traction height and angle during traction, and the traction force direction is prone to deviating from the mechanical axis required by the fracture site, increasing the risk of injury.
A traction structure for a Blanc orthopedic traction device was designed. Through the coordinated work of the pulley system and the adjustment of the traction frame, the angles and lengths of the first, second, third, and fourth sections of the traction rope remain unchanged. The traction power unit provides balancing force to achieve dynamic adjustment of the traction bow.
It reduces the difficulty of traction, improves the stability of the traction force direction and the fit of the mechanical axis, and reduces the risk of traction damage.
Smart Images
Figure CN122097052A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of medical devices, specifically relating to the traction structure of a Blanc orthopedic traction device. Background Technology
[0002] The Brown traction device (also known as the Brown frame or Brown frame) is a commonly used medical auxiliary device in orthopedics, mainly used for traction of lower limb fractures, such as fractures of long bones in the lower limbs, pelvic fractures, hip dislocations, and traction of lower limb bones and joints with purulent inflammation, etc.
[0003] Currently, the Blanc orthopedic traction device includes a leg support frame and a traction frame. The leg support frame includes a chassis and a lower limb support frame, which includes a horizontal lower leg support and an inclined thigh support. The lower leg support and thigh support are generally fixed in position. The traction frame includes a traction frame, a support wheel, a traction rope, a traction power unit, and a traction bow. The traction frame is adjustable from the bottom by tilting forward and backward relative to the traction frame body through locking components.
[0004] For traction structures, a traction rope typically loops around the frame wheels, with both ends connected to the traction pantograph and the traction power unit, respectively. The traction force is adjusted via the traction power unit. However, in actual traction, once the leg rest posture is adjusted, the traction suspension height depends entirely on the length of the traction rope, which is generally fixed. Therefore, the traction height adjustment support is then matched by adjusting the leg rest, increasing the difficulty and time required for repeated adjustments and verification of the force line accuracy. Simultaneously, the traction angle adjustment mainly relies on the rotation of the traction frame. However, the frame wheels generally include a top frame wheel located on the traction frame and a bottom frame wheel located on the top frame. The traction rope passes through the intermediate frame wheel and the top frame wheel from bottom to top on the leg support frame. When the angle of the traction frame is adjusted, the traction rope may bypass the intermediate frame wheel and pass directly through the top frame wheel. This not only increases the sway rate of the traction rope itself, but also makes it difficult to stabilize the direction of the traction force generated by the traction bow. At the same time, during the traction process, it is based on a relatively balanced state and continues to pull under a stable tension. However, once it is necessary to adjust the magnitude of the traction force, it is easy to change the traction direction, causing the traction force direction to deviate from the mechanical axis required by the fracture site, directly affecting the traction effect and increasing the risk of traction injury. Summary of the Invention
[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide an improved traction structure for a Brown orthopedic traction device.
[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A traction frame for a Blanc orthopedic traction device includes a traction frame, wheel assembly, traction rope, traction power unit, and traction bow. The traction frame is adjustable from the bottom by tilting forward and backward relative to the leg support frame via a locking component. The traction frame can extend and retract relative to the left and right sides to adjust the height of the top of the frame. The wheel assembly includes a first pulley group and a second pulley group respectively positioned at the bottom of the leg support frame and the front end of the lower leg support, and a third pulley group located at the top of the traction frame. The first pulley group is located to the side and below the power output end of the traction power unit, and the second pulley group is located above the first pulley group. The traction rope includes a first section between the traction power unit and the first pulley group, a second section between the first and second pulley groups, and a third section between the second and third pulley groups. The fourth section is located between the third pulley group and the traction bow. Based on the shifting position of the third pulley group as the traction frame tilts forward and backward, the first and second sections maintain their angles and lengths. The height and angle of the traction bow are adjusted based on the complementary cooperation of the third and fourth sections. During traction, the pulling force provided by the traction power unit and the traction bow are dynamically balanced by the opposing pulling force from the patient's lower limbs. The first, second, third, and fourth sections all maintain their angles and lengths. When adjusting the traction force, the angle and length of the first section change, while the second section maintains its angle, passing between two adjacent pulleys and wrapping around one of them towards the third pulley group. Based on the coordinated lifting and lowering of the traction frame, the length of the third section compensates to ensure that the fourth section maintains its angle and length while adjusting the traction force.
[0007] Preferably, the traction force adjustment is divided into increasing the traction force and decreasing the traction force. When the traction force increases, the first segment becomes longer and the angle with the horizontal plane becomes smaller, the length and angle of the second segment remain unchanged, the third segment becomes shorter and the angle remains unchanged, and the length and angle of the fourth segment remain unchanged. When the traction force decreases, the first segment becomes shorter and the angle with the horizontal plane becomes larger, the length and angle of the second segment remain unchanged, the third segment becomes longer and the angle remains unchanged, and the length and angle of the fourth segment remain unchanged.
[0008] According to a specific embodiment and preferred aspect of the present invention, the first pulley group is positioned at the front end of the chassis, and the second pulley group is positioned at the front end of the leg support frame. The second pulley group includes multiple pulleys spaced apart front to back and parallel to each other. The second section, based on the position of the third pulley group, selects and passes around the corresponding pulleys to bypass the front and rear sides of the traction frame. Using multiple pulleys for selection and transfer avoids the phenomenon where the traction rope directly passes around the third pulley group from the first pulley group. This would prevent the complementary changes in the length of the traction rope, thus affecting the angle change (i.e., the change in the direction of tension) during adjustment.
[0009] Preferably, the leg support structure includes a chassis, a front-to-back arrangement of lower leg supports and a rear-mounted upper leg support. The second pulley group is positioned at the front end of the lower leg support forming the support surface, and the second pulley group moves up, down, and forward and backward synchronously with the support surface. Under normal circumstances, the leg support structure does not participate in the traction process. However, if the working condition requires it, the second pulley group can be used to implement a fourth stage of adjustment force that maintains the angle and length unchanged.
[0010] According to another specific embodiment and preferred aspect of the invention, the traction frame includes side rods located on the left and right sides, and top rods for engaging the tops of the side rods, wherein the side rods are fixed to the locking member from their lower ends, and the side rods are adjustable in length direction. The synchronous telescoping motion of the two side rods creates complementary lengths of the traction rope (because the traction length remains constant), providing the necessary conditions for tension adjustment.
[0011] According to another specific embodiment and preferred aspect of the present invention, the locking component includes a lock seat, a lock plate rotatably connected to the lock seat about a horizontal direction, and a lock pin, wherein the lower end of the side rod of the traction frame is fixed to the lock plate, the lock seat is provided with a plurality of lock holes arranged about the rotation center of the lock plate, and the lock pin and the corresponding lock hole cooperate to form a lock at the current angle.
[0012] Preferably, there are two locking components that are symmetrically connected to the bottom of the side rod of the traction frame.
[0013] According to another specific embodiment and preferred aspect of the present invention, the traction power unit includes a traction end, a traction cylinder, and a slide rail, wherein the slide rail extends front and rear and is fixed on the chassis, the traction end is slidably mounted on the slide rail, the extension and retraction movement direction of the traction cylinder is consistent with the extension direction of the slide rail, and the tilt angle of the first segment with respect to the horizontal plane is changed based on the lateral displacement change of the position of the traction end.
[0014] Preferably, when adjusting the traction force, the angle between the first segment and the horizontal plane is 8~20°.
[0015] Furthermore, the pulleys of the first, second, and third pulley groups are respectively located at the bottom of the leg support structure, the front end of the lower leg support, and the middle of the traction frame top rod, and are all situated in the same plane. This planar layout prevents lateral displacement in the left-right direction during traction, thus ensuring that the direction of the generated traction force is highly aligned with the mechanical axis.
[0016] Due to the implementation of the above technical solutions, the present invention has the following advantages compared with the prior art: Existing Blanc orthopedic traction devices typically involve a traction rope looping around a frame wheel during traction. The two ends of the traction rope are connected to a traction bow and a traction power unit, respectively. The traction force is adjusted via the traction power unit. However, in actual traction, once the leg rest posture is adjusted, the traction suspension height depends entirely on the length of the traction rope, which is generally fixed. Therefore, adjusting the traction height requires further adjustment of the leg rest, increasing the difficulty and time required for repeated adjustments and verification of the force line accuracy. Simultaneously, traction angle adjustment relies primarily on the rotation of the traction frame; however, the frame wheel typically includes a top section located on the traction frame. The traction rope passes from bottom to top around the intermediate frame wheel and the top frame wheel on the support frame. However, when the traction frame is adjusted at an angle, the traction rope may bypass the intermediate frame wheel and pass directly around the top frame wheel. This not only increases the sway rate of the traction rope itself but also makes it difficult to stabilize the direction of the traction force generated by the traction bow. Furthermore, during traction, it maintains a relatively balanced state and continuously pulls under stable tension. However, once the magnitude of the traction force needs to be adjusted, the traction direction can easily change, causing the traction force direction to deviate from the mechanical axis required for the fracture site. This directly affects the traction effect and increases the risk of traction injury. The present invention addresses the shortcomings and defects of existing technologies by ingeniously designing the overall structure of the traction framework of the Blanc orthopedic traction device. Using this traction framework, with comfortable leg support, the traction rope, passing sequentially around the first, second, and third pulley groups from bottom to top, pulls the traction bow forward and upward. Simultaneously, according to the patient's required tension, the traction power unit provides a balanced traction force, maintaining continuous traction with constant angle and length in the first, second, third, and fourth sections. Then, when the tension needs adjustment, the angle and length of the first section change, while the second section, maintaining a constant angle, passes between two adjacent pulleys and wraps around one of the pulleys. The third pulley system, based on the coordinated lifting and lowering of the traction frame, and the length compensation of the third section to ensure that the fourth section maintains a constant angle and length while adjusting the traction force (or tension), allows the present invention to adjust the position and traction direction of the traction bow based on the height and angle adjustment of the traction frame, without requiring further adjustment of the leg rest position, thus reducing the difficulty of traction. Furthermore, based on the coordinated length and angle of the four traction ropes, it can not only maintain the current traction in dynamic balance mode, but also implement changes in traction force while maintaining a constant traction position and angle, thereby improving the alignment between the traction direction and the mechanical axis and reducing the risk of traction injury. Attached Figure Description
[0017] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.
[0018] Figure 1 This is a schematic diagram of the Blanc orthopedic traction device in this embodiment; Figure 2 for Figure 1 Front view diagram; Figure 3 for Figure 2 A top-down view; Figure 4 for Figure 3 Schematic diagram of the sectional view along the central AA direction; Wherein: S, traction frame; 1, traction frame; 10, side rod; 11, top rod; 2, frame wheel; 21, first pulley block; 22, second pulley block; 220, pulley; 23, third pulley block; 3, traction rope; 31, first section; 32, second section; 33, third section; 34, fourth section; 4, traction power unit; 40, traction end; 41, traction cylinder; 42, slide rail; 5, traction bow; 6, locking component; 60, lock seat; 600, lock hole; 61. Locking plate; 62. Locking pin; G. Leg support frame; g1. Chassis; g10. Base rod; g2. Lower leg support; g20. Bottom support rod; g21. Top support rod; g22. Connecting rod; g3. Thigh support; g30. Lateral movement support rod; L. Left lateral movement rod; R. Right lateral movement rod; M. Crossbar; g31. Bracket rod; g32. Reinforcing rod; Q. Drive assembly; Q1. First power unit; Q2. Second power unit; Q3. Third power unit; q33. Power sleeve. Detailed Implementation
[0019] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below. In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.
[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. In this application, unless otherwise explicitly specified and limited, the terms "installed," "connected," "joined," "fixed," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two elements or the interaction between two elements, unless otherwise explicitly specified. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. In this application, unless otherwise explicitly specified and limited, "on" or "below" a second feature may mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact through an intermediate medium. Furthermore, the terms "above," "over," and "on top" for the first feature and the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "under," and "beneath" for the first feature and the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature. It should be noted that when an element is referred to as "fixed to" or "set on" another element, it can be directly on the other element or there may be an intermediate element present. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element present. The terms "vertical," "horizontal," "above," "below," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementations.
[0021] like Figures 1 to 4 As shown, the traction structure S of the Blanc orthopedic traction device in this embodiment includes a traction frame 1, a frame wheel 2, a traction rope 3, a traction power unit 4, and a traction bow 5.
[0022] The traction frame 1 is tilted forward and backward relative to the leg support frame G via the locking component 6 from the bottom. The traction frame 1 can also extend and retract relative to the left and right sides to adjust the height of the top of the frame. Specifically, the traction frame 1 includes side rods 10 located on the left and right sides and top rods 11 for connecting the tops of the side rods 10. The side rods 10 are fixed to the locking component 6 from the lower end and can be extended and retracted along their own length. The synchronous extension and retraction of the two side rods 10 creates complementary lengths of the traction rope 3 (because the traction length is always constant), providing the necessary conditions for tension adjustment.
[0023] The frame wheel 2 includes a first pulley group 21 and a second pulley group 22 respectively positioned at the front end of the chassis g1 and the lower leg support, and a third pulley group 23 located at the top of the top rod 11. The first pulley group 21 is located to the side and below the power output end of the traction power unit 4, and the second pulley group 22 is located above the first pulley group 21.
[0024] The first pulley block 21 is positioned at the front end of the chassis g1, and the second pulley block 22 is positioned at the front end of the leg support frame G. The second pulley block 22 includes multiple pulleys 220 spaced apart and parallel to each other. The second segment 32, based on the position of the third pulley block 23, selects and bypasses the corresponding pulley 220 to bypass the front and rear sides of the traction frame 1. Multiple pulleys are used for selection and transfer to avoid the traction rope directly bypassing the third pulley block from the first pulley block, which would prevent the complementary changes in the length of the traction rope and thus affect the angle change (i.e., the change in the direction of the pulling force) during adjustment. The leg support frame G includes the chassis g1, the front and rear arranged lower leg support g2, and the upper leg support g3. The second pulley block 22 is positioned at the front end of the support surface formed by the lower leg support g2, and the second pulley block 22 moves synchronously up, down, and forward and backward with the support surface. Normally, the leg support frame does not participate in the traction process, but if the working condition requires it, it cooperates with the second pulley block 22 to implement the fourth segment 34, maintaining the angle and length of the adjustment pulling force. In this example, the pulleys of the first pulley group 21, the second pulley group 22, and the third pulley group 23 are respectively located at the bottom of the leg support frame G, the front end of the lower leg support, and the middle of the traction frame top rod, and are all located in the same plane. This planar layout avoids lateral displacement in the left-right direction during traction, thus ensuring that the direction of the traction force is highly aligned with the mechanical axis. Furthermore, the first pulley group 21, the second pulley group 22, and the third pulley group 23 have identical structures, each including a wheel seat and a pulley. The pulleys are freely rotatable and mounted on their respective wheel seats. In this example, the axis lines of each pulley are kept parallel to each other.
[0025] In some specific embodiments, the chassis g1 is composed of multiple base rods g10 and is rectangular in shape; the lower leg support g2 includes multiple base support rods g20 distributed in pairs at the front and rear ends and left and right sides of the chassis g1, and top support rods g21 rotatably connected to the top of the multiple base support rods g20. The thigh support g3 includes lateral support rods g30 slidably installed on the left and right sides of the rear end of the top support rod g21 in the front-rear direction, and bracket rods g31 that are flipped up and down in the left-right direction and connected to the lateral support rods g30.
[0026] In this example, there are four bottom support rods g20, arranged in a square pattern, with each bottom support rod g20 parallel to the others. The parallelogram principle ensures good stability during rotation, guaranteeing safety and preventing angular changes in the support plane, thus ensuring the accuracy of the traction reference plane. The top support rod g21 is a square frame rod, pivotally connected to the top of the bottom support rods from the four corners. This frame design not only strengthens the support of the lower leg but also facilitates synchronous movement on both sides. The lateral support rod g30 includes a left lateral support rod L and a right lateral support rod R extending parallel to the top support rod g21, and a crossbar M positioned between the left and right lateral support rods L and R. The left and right lateral support rods L and R move synchronously and in the same direction relative to each other to adjust the distance between the relative support points. The bracket rod g31 is pivotally connected from its upper end to the rear ends of the left and right lateral support rods L and R, respectively. Simultaneously, to achieve coordinated movement between the calf support g2 and the thigh support g3, the drive assembly Q includes a first power unit Q1 located between the chassis g1 and the bottom support rod g20 for driving multiple bottom support rods g20 to rotate forward or backward around the pivot bottom; a second power unit Q2 installed between the transverse support rod g30 and the bracket rod g31 for driving the bracket rod g31 to rotate up and down around the pivot end; and a third power unit Q3 installed on the top support rod g21 for driving the transverse support rod g30 to move forward and backward. The coordination of the first, second, and third power units Q1, Q2, and Q3 enables adjustment of the angle, height, and distance between relative support points of the calf support g2 and the thigh support g3. In this example, the first power unit Q1 adjusts the angle and height of the calf support g2 and the thigh support g3; the second power unit Q2 adjusts the angle of the thigh support g3; and the third power unit Q3 adjusts the distance between relative support points and the angle of the thigh support g3. Based on adjustments for different functions, and adaptive adjustments to position, angle, and support points during synchronous movement, an angle support conforming to human biomechanics is formed, thus providing sufficient and necessary conditions for traction. In this example, the two rear bottom support rods g20 are connected by a connecting rod g22. The two ends of the first power unit Q1 are respectively connected between the connecting rod g22 and the chassis g1, and the first power unit Q1 is a telescopic rod, driven by electric, pneumatic, or hydraulic means. Based on the telescopic movement of the telescopic rod, the bottom support rod g20 is pushed forward or backward to flip, while keeping the top support rod g21 moving up and down and forward and backward at the same angle. A reinforcing rod g32 is provided between the left and right sides of the bracket rod g31. The two ends of the second power unit Q2 are respectively connected to the reinforcing rod g32 and the crossbar M, and the second power unit Q2 is a telescopic rod, driven by electric, pneumatic, or hydraulic means. The third power unit Q3 is fixedly installed on the side of the top support rod g21. The left transverse rod L and / or the right transverse rod R pass through the third power unit Q3 and are driven by the third power unit Q3 to move the left transverse rod L and the right transverse rod R synchronously.Furthermore, the third power unit Q3 includes a power sleeve g33 and a locking bolt. The left lateral movement rod L and the right lateral movement rod R pass through and protrude from the corresponding side power sleeve g33. The locking bolt automatically engages with the power sleeve g33 against the left lateral movement rod L and / or the right lateral movement rod R to form a positioning. The locking bolt disengages from the corresponding side lateral movement rod and shifts relative to it under external force. This allows for manual adjustment; once unlocked, adjustment is achieved, and locking simultaneously establishes the positioning. Alternatively, the third power unit Q3 can be an electromagnetic coil, where the left lateral movement rod L and the right lateral movement rod R are iron cores passing through the electromagnetic coil. The length of the iron cores protruding from the electromagnetic coil changes relative to the energization or de-energization of the electromagnetic coil, causing the bracket rod g31 to shift synchronously. Furthermore, electromagnetic drive is used for control; energization drives the iron core movement for adjustment, and de-energization positions the iron core.
[0027] The traction rope 3 includes a first segment 31 located between the traction power unit 4 and the first pulley block 21, a second segment 32 located between the first pulley block 21 and the second pulley block 22, a third segment 33 located between the second pulley block 22 and the third pulley block 23, and a fourth segment 34 located between the third pulley block 23 and the traction bow 5. The first segment 31 and the second segment 32 maintain their angles and lengths as the third pulley block 23 shifts and tilts with the traction frame 1. The traction bow 5 is adjusted based on the complementary cooperation of the lengths of the third segment 33 and the fourth segment 34. Height and angle; During traction, the tension provided by the traction power unit 4 and the traction bow 5 are kept in dynamic balance by the reverse tension of the patient's lower limbs. The first, second, third, and fourth segments 31, 32, 33, and 34 all maintain constant angle and length. When adjusting the traction tension, the angle and length of the first segment 31 change, while the second segment 32 maintains a constant angle, passes between two adjacent pulleys, and wraps around one of the pulleys to the third pulley group. Based on the coordinated lifting and lowering of the traction frame, the length of the third segment is compensated to ensure that the fourth segment maintains a constant angle and length for adjusting the tension.
[0028] The traction power unit 4 includes a traction end 40, a traction cylinder 41, and a slide rail 42. The slide rail 42 extends forward and backward and is fixed to the chassis. The traction end 40 is slidably mounted on the slide rail 42. The extension and retraction movement of the traction cylinder 41 is in the same direction as the extension of the slide rail 42. Based on the lateral movement of the traction end 40, the tilt angle between the first segment 31 and the horizontal plane is changed. Specifically, during traction force adjustment, the angle formed between the first segment 31 and the horizontal plane is 8~20°.
[0029] The locking component 6 includes a lock seat 60, a lock plate 61 rotatably connected to the lock seat 60 in a horizontal direction, and a locking pin 62. The lower end of the side rod 10 of the traction frame 1 is fixed to the lock plate 61. The lock seat 60 has multiple locking holes 600 arranged around the rotation center of the lock plate 61, and the locking pin 62 cooperates with the corresponding locking hole 600 to form a lock at the current angle. In this example, there are two locking components 6 symmetrically connected to the bottom of the side rod 10 of the traction frame 1. That is, both are fixed to the lower end of the side rod 10 by the lock plate 61. At the same time, the height adjustment of the top rod 11 is completed by the synchronous extension and retraction of the side rod 10.
[0030] Therefore, based on the third pulley group 23 shifting position with the traction frame 1, the first segment 31 and the second segment 32 maintain their angles and lengths, and the height and angle of the traction bow 5 are adjusted based on the complementary cooperation of the lengths of the third segment 33 and the fourth segment 34; during traction, the tension provided by the traction power unit 4 and the traction bow 5 are dynamically balanced by the reverse tension of the patient's lower limbs, and the angles and lengths of the first, second, third, and fourth segments 31, 32, 33, and 34 all remain unchanged; when adjusting the traction tension, the angle and length of the first segment 31 change, while the second segment 32 maintains its angle and passes between two adjacent pulleys 220, and wraps around one of the pulleys 220 to the third pulley group 23. Based on the cooperative lifting and lowering of the traction frame 1, the length of the third segment 33 is compensated to ensure that the fourth segment 34 maintains its angle and length while adjusting the tension. Specifically, the traction force adjustment is divided into increasing the traction force and decreasing the traction force. When the traction force increases, the first segment 31 becomes longer and the angle with the horizontal plane becomes smaller. The length and angle of the second segment 32 remain unchanged. The third segment 33 becomes shorter and the angle remains unchanged. The length and angle of the fourth segment 34 remain unchanged. When the traction force decreases, the first segment 31 becomes shorter and the angle with the horizontal plane becomes larger. The length and angle of the second segment 32 remain unchanged. The third segment 33 becomes longer and the angle remains unchanged. The length and angle of the fourth segment 34 remain unchanged.
[0031] In summary, by adopting this traction structure, with comfortable leg support, the traction rope, passing sequentially around the first, second, and third pulley groups from bottom to top, pulls the traction bow forward and upward. Simultaneously, according to the patient's required tension, the traction power unit provides a balanced traction force, maintaining continuous traction with constant angle and length in the first, second, third, and fourth segments. Then, when the tension needs adjustment, the angle and length of the first segment change, while the second segment, maintaining a constant angle, passes between two adjacent pulleys, wraps around one of the pulleys, and winds towards the third pulley group. Based on the coordinated lifting and lowering of the traction frame, the length of the third segment compensates to ensure that the fourth segment maintains a constant angle and length while adjusting the traction force (or tension). Therefore, this invention provides effective traction... With the rope length remaining constant, firstly, the position and direction of the traction bow can be adjusted based on the height and angle of the traction frame, eliminating the need for further leg positioning adjustments and reducing traction difficulty. Secondly, the coordinated length and angle of the four traction rope segments not only allow for continuous traction in dynamic balance mode but also enable variations in traction force while maintaining a constant traction position and angle, improving the alignment of the traction direction with the mechanical axis and thus reducing the risk of traction injury. Thirdly, traction force adjustment is divided into increasing and decreasing force. When the force increases, the first segment lengthens and its angle with the horizontal plane decreases; the second segment's length and angle remain unchanged; the third segment shortens and its angle remains unchanged; and the fourth segment's length and angle remain unchanged. When the force decreases, the first segment shortens and its angle with the horizontal plane increases; the second segment's length and angle remain unchanged; the third segment lengthens and its angle remains unchanged; and the fourth segment's length and angle remain unchanged. Fourthly, multiple pulleys are used for selection and transfer to prevent the traction rope from directly bypassing the third pulley group from the first, thus preventing complementary changes in rope length and affecting the angle change (i.e., the change in the direction of the pulling force) during adjustment. Fifthly, the leg support structure does not participate in the traction process, but if required by the working conditions, it can adjust the pulling force in the fourth segment while maintaining its angle and length, based on the cooperation of the second pulley group. Sixthly, the complementary length of the traction rope is formed by the synchronous extension and retraction of the two side bars (because the traction...). The length of the pulley remains constant, providing the necessary conditions for tension adjustment. Simultaneously, based on multiple locking hole layout options, the locking pin and corresponding locking hole are matched to form a lock at the current angle. Seventhly, the extension and retraction direction of the traction cylinder is consistent with the extension direction of the slide rail. Furthermore, based on the lateral shift of the traction end position, the tilt angle between the first section and the horizontal plane is changed. During traction tension adjustment, the angle between the first section and the horizontal plane is 8~20°. This small angle change reduces the occurrence of shaking or unstable tension direction at the output end (fourth section). Eighthly, the pulley system is based on a planar layout, avoiding lateral displacement in the left and right directions during traction, thereby ensuring that the direction of the formed traction force is highly aligned with the mechanical axis.
[0032] The present invention has been described in detail above, with the aim of enabling those skilled in the art to understand and implement the invention. However, this description should not be construed as limiting the scope of protection of the invention. All equivalent changes or modifications made in accordance with the spirit and essence of the invention should be included within the scope of protection of the invention.
Claims
1. A traction frame for a Blanc orthopedic traction device, comprising a traction frame, a frame wheel, a traction rope, a traction power unit, and a traction bow, wherein the traction frame is adjustable from the bottom relative to the leg support frame by a locking component for forward tilting and backward tilting, characterized in that, The traction frame extends and retracts relative to each other from the left and right sides to adjust the height of the top of the frame. The frame wheels include a first pulley group and a second pulley group respectively positioned at the bottom of the leg support frame and the front end of the lower leg support, and a third pulley group located at the top of the traction frame. The first pulley group is located below the power output end of the traction power unit, and the second pulley group is located above the first pulley group. The traction rope includes a first section located between the traction power unit and the first pulley group, a second section located between the first and second pulley groups, a third section located between the second and third pulley groups, and a fourth section located between the third pulley group and the traction bow. The third pulley group extends and retracts with the traction frame. Forward and backward rollover transfer: the first and second segments maintain their angles and lengths, while the height and angle of the traction bow are adjusted based on the complementary cooperation of the third and fourth segments. During traction, the tension provided by the traction power unit and the traction bow are dynamically balanced by the opposing tension of the patient's lower limbs, and the first, second, third, and fourth segments all maintain their angles and lengths. When adjusting the traction tension, the angle and length of the first segment change, while the second segment maintains its angle, passing between two adjacent pulleys and wrapping around one of the pulleys towards the third pulley group. Based on the coordinated lifting and lowering of the traction frame, the length of the third segment is compensated to ensure that the fourth segment maintains its angle and length while adjusting the tension.
2. The traction structure of the Blanc orthopedic traction device according to claim 1, characterized in that, The traction force adjustment is divided into increasing the traction force and decreasing the traction force. When the traction force increases, the first segment becomes longer and the angle with the horizontal plane becomes smaller. The length and angle of the second segment remain unchanged. The third segment becomes shorter and the angle remains unchanged. The length and angle of the fourth segment remain unchanged. When the traction force decreases, the first segment becomes shorter and the angle with the horizontal plane becomes larger. The length and angle of the second segment remain unchanged. The third segment becomes longer and the angle remains unchanged. The length and angle of the fourth segment remain unchanged.
3. The traction structure of the Blanc orthopedic traction device according to claim 1, characterized in that, The first pulley group is located at the front end of the chassis, and the second pulley group is located at the front end of the leg support frame. The second pulley group includes multiple pulleys spaced apart front and back and parallel to each other. The second section selects to bypass the corresponding pulleys and bypass the front and rear sides of the traction frame based on the position of the third pulley group.
4. The traction structure of the Blanc orthopedic traction device according to claim 3, characterized in that, The leg support structure includes a chassis, a front and rear arranged lower leg support frame and a thigh support frame. The second pulley group is located at the front end of the lower leg support frame forming the support surface, and the second pulley group moves up and down and back and forth synchronously with the support surface.
5. The traction structure of the Blanc orthopedic traction device according to claim 1, characterized in that, The traction frame includes side rods on the left and right sides and a top rod for connecting the top of the side rods. The side rods are fixed to the locking component from the lower end and can be adjusted to extend and retract along their own length.
6. The traction structure of the Blanc orthopedic traction device according to claim 1 or 5, characterized in that, The locking component includes a lock seat, a lock plate rotatably connected to the lock seat in a horizontal direction, and a lock pin. The lower end of the side rod of the traction frame is fixed to the lock plate. The lock seat has multiple lock holes arranged around the rotation center of the lock plate, and the lock pin and the corresponding lock hole cooperate to form a lock at the current angle.
7. The traction structure of the Blanc orthopedic traction device according to claim 6, characterized in that, There are two locking components that are symmetrically connected to the bottom of the side rod of the traction frame.
8. The traction structure of the Blanc orthopedic traction device according to claim 1, characterized in that, The traction power unit includes a traction end, a traction cylinder, and a slide rail. The slide rail extends forward and backward and is fixed on the chassis. The traction end is slidably mounted on the slide rail. The extension and retraction movement of the traction cylinder is in the same direction as the extension of the slide rail, and the tilt angle of the first segment with respect to the horizontal plane is changed based on the lateral displacement of the traction end.
9. The traction structure of the Blanc orthopedic traction device according to claim 8, characterized in that, When adjusting the traction force, the angle between the first section and the horizontal plane is 8~20°.
10. The traction structure of the Blanc orthopedic traction device according to claim 1, characterized in that, The pulleys of the first pulley group, the second pulley group, and the third pulley group are respectively located at the bottom of the leg support structure, the front end of the lower leg support, and the middle of the top rod of the traction frame, and are located in the same plane.