A traction system for orthopedic rehabilitation

Abstract

The present application relates to the field of rehabilitation equipment. The purpose is to provide a traction system for orthopedic rehabilitation, comprising a lying plate, the middle part of the lying plate is provided with a concave mounting cavity, the mounting cavity is provided with a thigh support plate, the lying plate on both sides of the thigh support plate is respectively provided with a hip support area and a foot support area; the foot support area is provided with a moving plate which can move along the length direction of the lying plate under the drive of a drive mechanism, the moving plate is provided with a foot pedal for fixing the foot of a patient; the thigh support plate can swing obliquely upward around the center line of the plate shaft when the moving plate moves toward the hip support area to form support for the thigh of the patient. When the present application is used for knee joint rehabilitation traction of a patient, it can form active support for the thigh of the patient, guide the bending direction of the thigh and the calf, and reduce the impact on the knee joint.

Description

A traction system for orthopedic rehabilitation Technical Field

[0001] This invention relates to the field of rehabilitation equipment, and more specifically to a traction system for orthopedic rehabilitation. Background Technology

[0002] In orthopedic rehabilitation, especially in knee joint rehabilitation, traction devices are an important rehabilitation method for pushing and pulling the joint. Currently, traditional knee traction primarily relies on manual traction. Medical staff support the patient's lower leg with one hand and hold the ankle with the other, pushing and pulling the leg forward and backward to achieve traction. This method is physically demanding and unsuitable for prolonged rehabilitation traction. To address this, some traction devices have emerged. These devices typically include a moving plate with a foot pedal. The patient lies supine with their feet on the foot pedal. The moving plate moves under the drive of a motor and electric push rods, thus inducing leg flexion and extension to achieve traction. However, this type of traction device lacks direct support for the thigh during operation. Especially during knee flexion, the joint is passively bent solely by the movement of the moving plate, which puts a certain impact on the joint and places a heavy burden on the drive components. Therefore, providing direct, active auxiliary support to the patient's thigh during traction would effectively solve these problems. Summary of the Invention

[0003] The purpose of this invention is to provide an orthopedic rehabilitation traction system that can provide active auxiliary support for the thigh.

[0004] To achieve the above-mentioned objectives, the present invention provides a traction system for orthopedic rehabilitation, comprising a bench, wherein a recessed mounting cavity is provided in the middle of the bench, a thigh support plate is provided in the mounting cavity, and a hip support area and a foot support area are respectively provided on the bench on both sides of the thigh support plate; the foot support area is provided with a movable plate that can move along the length of the bench under the drive of a drive mechanism, and a foot pedal for fixing the patient's foot is provided on the movable plate;

[0005] The thigh support plate is provided with a plate shaft at one end near the buttock support area and is hinged in the mounting cavity via the plate shaft. A first sprocket is provided at one end of the plate shaft, and a wheel axle is provided below the plate shaft. A second sprocket and a drive gear are provided on the wheel axle. The first sprocket and the second sprocket are connected by a chain. The drive gear is connected to the drive mechanism via a linkage mechanism.

[0006] The thigh support plate can swing obliquely upward around the center line of the plate axis when the moving plate moves toward the buttock support area, so as to provide support for the patient's thigh.

[0007] Preferably, the driving mechanism includes a first driving screw disposed below the horizontal plate corresponding to the foot support area. The first driving screw extends along the length direction of the horizontal plate and one end is connected to the driving motor. The first driving screw passes through a first threaded sleeve fixed to the bottom of the moving plate and forms a threaded engagement with the first threaded sleeve.

[0008] Preferably, the leg support area of ​​the horizontal board is provided with a strip-shaped sliding opening extending along the length of the horizontal board, the bottom surface of the movable plate is provided with a vertical ridge that matches the sliding opening, the upper part of the vertical ridge is provided with an I-shaped groove corresponding to the sliding opening, and is engaged with the sliding opening through the groove; a first threaded sleeve is provided at the bottom of the vertical ridge.

[0009] Preferably, the linkage mechanism includes a second drive screw disposed below the horizontal plate corresponding to the mounting cavity, the second drive screw extending along the length direction of the horizontal plate and forming a transmission engagement with the first drive screw;

[0010] The linkage mechanism further includes a first sliding bar and a second sliding bar. The first sliding bar slides in cooperation with a first sliding groove located at the bottom of the mounting cavity. One end of the first sliding bar is sleeved on the second drive screw and forms a threaded engagement with the second drive screw. The other end of the first sliding bar is bent downward to form an upper contact head.

[0011] The second sliding bar is located below the drive gear, and the lower part of the second sliding bar is in sliding engagement with the second sliding groove. The second sliding groove is fixedly connected to the horizontal plate. A rack is provided at the top of the second sliding bar, and the rack meshes with the drive gear. The end of the second sliding bar near the upper contact head is bent upward to form a lower contact head, and the upper contact head and the lower contact head are opposite each other.

[0012] Preferably, the upper contact head is provided with an adaptive adjusting cylinder, the adaptive adjusting cylinder is provided with a stop block, the stop block and the adaptive adjusting cylinder are in sliding fit, and a buffer spring is provided between the stop block and the bottom of the adaptive adjusting cylinder; a stop rod is provided on the lower contact head at a position opposite to the stop block.

[0013] Preferably, a speed-changing mechanism is provided at the opposite ends of the first and second drive screws. The speed-changing mechanism includes a first contact rod and a second contact rod. The first contact rod is disposed on the first drive screw and is arranged in a cross shape. The second contact rod is disposed on a sliding sleeve and is also arranged in a cross shape. The sliding sleeve and a square rod fixedly disposed at the end of the second drive screw form a sliding fit and are connected to the output end of an adjusting motor disposed on the square rod. The outer section of the second contact rod is inclined toward the first contact rod to form a speed-changing section.

[0014] Preferably, the thigh support plate has an arc-shaped flange at the end away from the buttock support area.

[0015] Preferably, the foot pedal is an L-shaped pedal arranged side by side on the top surface of the moving plate, and the corner of the pedal is hinged to the moving plate.

[0016] Preferably, the pedal is equipped with hook and loop fasteners, which can secure the patient's foot to the pedal.

[0017] Preferably, the hip support area is provided with a concave arc-shaped groove.

[0018] The beneficial effects of this invention are mainly reflected in the following aspects: when performing knee joint rehabilitation traction on patients, it can provide active support for the patient's thigh, guide the flexion direction of the thigh and calf, and reduce the impact on the knee joint. Specifically, in the process of using this invention, the patient lies supine on the board, with their feet fixed on the footrests on the movable board. When flexing the knee, the drive mechanism drives the movable board to move towards the hip support area. At the same time, it can drive the drive gear to rotate through the linkage mechanism, and then drive the drive gear, axle, second sprocket, chain, and first sprocket in sequence, causing the thigh support plate to rotate around the axle. The diagonal support direction of the thigh support plate matches the flexion direction of the knee joint. On the one hand, it provides guidance for the knee flexion movement. Compared with the method of no bending guidance and relying entirely on the rigid push of the movable board, it can reduce the impact on the knee joint. On the other hand, it can also provide a certain degree of support for the patient's thigh, improving comfort. When performing stretching traction, as the movable board moves away from the hip support area, the thigh support plate can gradually lower, without interfering with the stretching traction, ensuring the comfort of the supine position. Attached Figure Description

[0019] Figure 1 is a schematic diagram of the structure of the present invention;

[0020] Figure 2 is an enlarged view of part A in Figure 1;

[0021] Figure 3 is a schematic diagram of the internal structure of the adaptive regulating cylinder;

[0022] Figure 4 is an enlarged view of part B in Figure 1;

[0023] Figure 5 is a schematic diagram of the movable plate. Detailed Implementation

[0024] As shown in Figures 1-5, a traction system for orthopedic rehabilitation is mainly used in orthopedic knee joint rehabilitation to assist in knee joint rehabilitation movements, achieving knee flexion and rope traction. As shown in Figure 1, the invention includes a supine board 1 for the patient to lie on. In different embodiments, it can be used in conjunction with a rehabilitation chair, hospital bed, etc.

[0025] The middle of the supine board 1 has a recessed mounting cavity 2, and a thigh support plate 3 is installed inside the mounting cavity 2. As the name suggests, the thigh support plate 3 is used to support the patient's thigh. Its main support action is that when the knee is flexed, the thigh support plate 3 is raised, and when stretching is performed, the upper arm supporting leg 3 is lowered. The supine board 1 on both sides of the thigh support plate 3 is respectively provided with a hip support area 4 and a foot support area 5.

[0026] The hip support area 4 is the core support area, bearing a large weight. To improve comfort, the hip support area 4 can be provided with a concave, ergonomically designed arc-shaped groove. In use, the patient's hips are located within the hip support area 4, the thighs are positioned corresponding to the thigh support plate 3, and the calves and feet are located in the foot support area 5. The foot support area 5 of this invention is equipped with a movable plate 6 that can move along the length of the bed board 1 under the drive of a driving mechanism. The movable plate 6 is equipped with a footrest for fixing the patient's feet.

[0027] When the movable plate 6 moves toward the hip support area 4, it can lead the patient to perform knee flexion. However, this method alone lacks support for the thigh, which is not conducive to guiding the bending of the thigh and calf in the initial stage of knee flexion. Furthermore, simply pushing and squeezing through the movable plate 6 and the foot pedal on it will also cause a certain impact on the knee joint.

[0028] Therefore, the thigh support plate 3 of the present invention is provided with a plate shaft 7 at one end near the buttock support area 4, and is hinged in the mounting cavity 2 via the plate shaft 7. The thigh support plate 3 can rotate around the center line of the plate shaft 7, thereby realizing lifting and lowering. Regarding the driving mechanism of the thigh support plate 3, a first sprocket 8 is provided at one end of the plate shaft 7, and a wheel axle 9 is provided below the plate shaft 7. A second sprocket 10 and a drive gear 11 are provided on the wheel axle 9. The first sprocket 8 and the second sprocket 10 are connected by a chain 12. The drive gear 11 is connected to the drive mechanism through a linkage mechanism. When the moving plate 6 moves toward the buttock support area 4, the thigh support plate 3 can swing obliquely upward around the center line of the plate shaft 7 to provide support for the patient's thigh. The end of the thigh support plate 3 away from the buttock support area 4 is provided with an arc-shaped flange 37 to prevent the end of the thigh support plate 3 from pressing on the back of the patient's thigh, further improving comfort.

[0029] In use, the patient lies supine on the board 1 with their feet fixed to footrests on the movable board. When knee flexion is performed, the drive mechanism moves the movable board 6 toward the hip support area 4. Simultaneously, the linkage mechanism drives the drive gear 11 to rotate, which in turn moves the drive gear 11, axle 9, second sprocket 10, chain 12, and first sprocket 8 in sequence, causing the thigh support plate 3 to rotate around the axle 7. The diagonal support direction of the thigh support plate 3 coincides with the bending direction of the knee joint, providing guidance for knee flexion. Compared to a method that relies entirely on the rigid push of the movable board 3 without bending guidance, this reduces the impact on the knee joint. Furthermore, it provides some support to the patient's thigh, improving comfort. During traction, as the movable board 6 moves away from the hip support area 4, the thigh support plate 3 gradually lowers, without interfering with the traction and ensuring the comfort of the supine position.

[0030] The present invention employs various specific forms of drive mechanisms, such as: a cylinder directly driving the moving plate 6, a linear motor directly driving the moving plate 6, etc. Alternatively, as shown in Figure 1, the drive mechanism includes a first drive screw 13 disposed below the horizontal plate 1 corresponding to the foot support area 5. The first drive screw 13 extends along the length of the horizontal plate 1, and one end is connected to the drive motor 14. The first drive screw 13 passes through a first threaded sleeve 15 fixed to the bottom of the moving plate 6, forming a threaded engagement with the first threaded sleeve 15.

[0031] As shown in Figure 1, the sliding mechanism of the movable plate 6 in this invention features a strip-shaped sliding opening 16 extending along the length of the horizontal plate 1 on its leg support area, as shown in Figure 5. The bottom surface of the movable plate 6 has a vertical ridge 17 adapted to the sliding opening 16. An I-shaped clamping groove 18 is provided on the upper part of the vertical ridge 17 corresponding to the sliding opening 16, and the ridge is engaged with the sliding opening 16 via the clamping groove 18. A first threaded sleeve 15 is provided at the bottom of the vertical ridge 17.

[0032] During operation, the drive motor 14 actuates, driving the first drive screw 13 to move, which in turn moves the moving plate 6 along the sliding opening 16. The patient's foot is fixed on the foot pedal. During the movement of the moving plate 6, the foot pedal and the patient's foot move together. Of course, since the patient's ankle joint also undergoes some angle changes during movement, to improve the comfort of the foot pedal, the foot pedal of this invention is an L-shaped pedal 38 arranged side-by-side on the top surface of the moving plate 6, with the corner of the pedal 38 hinged to the moving plate 6. The pedal 38 is equipped with a Velcro strap 39, allowing the patient's foot to be secured to the pedal 38, making it extremely convenient to use.

[0033] In addition to the driving mechanism using the first driving screw 13, the present invention also discloses a linkage mechanism, as shown in Figures 1 and 2. The linkage mechanism of the present invention includes a second driving screw 19 disposed below the horizontal plate 1 corresponding to the mounting cavity 2. The second driving screw 19 extends along the length direction of the horizontal plate 1 and forms a transmission cooperation with the first driving screw 13. The action of the first driving screw 13 can drive the second driving screw 19 to move.

[0034] The linkage mechanism further includes a first sliding bar 20 and a second sliding bar 21. The first sliding bar 20 is slidably engaged with a first sliding groove 22 located at the bottom of the mounting cavity 2. One end of the first sliding bar 20 is sleeved on the second drive screw 19 and forms a threaded engagement with the second drive screw 19. The other end of the first sliding bar 20 is bent downwards to form an upper contact head 23.

[0035] The second sliding bar 21 is disposed below the drive gear 11, and the lower part of the second sliding bar 21 is in sliding engagement with the second sliding groove 24, which is fixedly connected to the horizontal plate 1. A rack 25 is provided at the top of the second sliding bar 21, and the rack 25 meshes with the drive gear 11. The end of the second sliding bar 21 near the upper contact head 23 is bent upwards to form a lower contact head 26, with the upper contact head 23 and the lower contact head 26 facing each other.

[0036] When the first drive screw 13 drives the moving block 6 to move, it can also drive the second drive screw 19 to move. The second drive screw 19 moves, driving the first sliding bar 20 to move. The upper contact head 23 on the first sliding bar 20 can drive the second sliding bar 21 to move through the lower contact head 26 on the second sliding bar 21. The rack 25 mounted on the second sliding bar 21 drives the drive gear 11 to rotate, thereby sequentially driving the wheel axle, the second sprocket, the chain, the first sprocket, and the plate axle, ultimately realizing the drive of the thigh support plate 3.

[0037] Considering that the leg lengths of different patients vary and the ratio of thigh to calf length differs significantly, in order for the thigh support plate 3 to adapt to the bending angle of the thigh and calf during rotation, the upper contact head 23 of this invention is provided with an adaptive adjustment cylinder 27. A stop block 28 is provided inside the adaptive adjustment cylinder 27, and the stop block 28 and the adaptive adjustment cylinder 27 form a sliding fit. A buffer spring 29 is provided between the stop block 28 and the bottom of the adaptive adjustment cylinder 27. A stop rod 30 is provided on the lower contact head 26 opposite to the stop block 28. In this configuration, since the power transmission between the first sliding bar 20 and the second sliding bar 21 is no longer rigid, it can adaptively adjust by compressing the buffer spring 29, thus adapting to a wider range of people with different leg length ratios and providing better comfort.

[0038] Generally, the first drive screw 13 and the second drive screw 19 of this invention are directly connected by a coupling. However, this method, because the two rotate at the same speed, is not suitable for use in different rehabilitation scenarios. Therefore, a better approach of this invention is to also have a speed-changing function. As shown in Figure 4, a speed-changing mechanism is provided at the opposite end of the first drive screw 13 and the second drive screw 19. The speed-changing mechanism includes a first contact rod 31 and a second contact rod 32. The first contact rod 31 is disposed on the first drive screw 13 and is arranged in a cross shape. The second contact rod 32 is disposed on the sliding sleeve 33 and is also arranged in a cross shape. The sliding sleeve 33 forms a sliding fit with the square rod 34 fixedly disposed at the end of the second drive screw 19 and is connected to the output end of the adjusting motor 35 disposed on the square rod 34. The outer section of the second contact rod 32 is inclined toward the first contact rod 31, forming a speed-changing section 36.

[0039] In use, the position of the sliding sleeve 33 on the square rod 34 can be changed by adjusting the motor 35, thereby changing the contact point between the speed change section 36 of the second contact rod 32 and the first contact rod 32. By changing the contact point, the transmission ratio of the first drive screw 13 and the second drive screw 19 is changed, thereby realizing speed regulation and making the application scenarios of the present invention more extensive.

Claims

1. A traction system for orthopedic rehabilitation, comprising a bench (1), wherein a recessed mounting cavity (2) is provided in the middle of the bench (1), a thigh support plate (3) is provided in the mounting cavity (2), and a hip support area (4) and a foot support area (5) are respectively provided on the bench (1) on both sides of the thigh support plate (3); the foot support area (5) is provided with a movable plate (6) that can move along the length direction of the bench (1) under the drive of a driving mechanism, and a foot pedal for fixing the patient's foot is provided on the movable plate (6); characterized in that: The thigh support plate (3) is provided with a plate shaft (7) at one end near the buttock support area (4), and is hinged in the mounting cavity (2) via the plate shaft (7). A first sprocket (8) is provided at one end of the plate shaft (7), and a wheel axle (9) is provided below the plate shaft (7). A second sprocket (10) and a drive gear (11) are provided on the wheel axle (9). The first sprocket (8) and the second sprocket (10) are connected by a chain (12). The drive gear (11) is connected to the drive mechanism via a linkage mechanism. The thigh support plate (3) can swing obliquely upward around the center line of the plate shaft (7) when the moving plate (6) moves toward the buttock support area (4) to form support for the patient's thigh. The support; the driving mechanism includes a first driving screw (13) located below the horizontal plate (1) corresponding to the foot support area (5). The first driving screw (13) extends along the length direction of the horizontal plate (1) and one end is connected to the driving motor (14). The first driving screw (13) passes through the first threaded sleeve (15) fixed at the bottom of the moving plate (6) and forms a threaded engagement with the first threaded sleeve (15). The leg support area of ​​the horizontal plate (1) is provided with a strip-shaped sliding opening (16) extending along the length direction of the horizontal plate (1). The bottom surface of the moving plate (6) is provided with a vertical ridge (17) adapted to the sliding opening (16). The upper part of the vertical ridge (17) corresponds to the sliding opening (16). The area is provided with an I-shaped clamping groove (18), and is locked at the sliding opening (16) through the clamping groove (18); the bottom of the vertical edge (17) is provided with a first threaded sleeve (15); the linkage mechanism includes a second drive screw (19) provided below the horizontal plate (1) corresponding to the mounting cavity (2), the second drive screw (19) extends along the length direction of the horizontal plate (1) and forms a transmission cooperation with the first drive screw (13); the linkage mechanism also includes a first sliding bar (20) and a second sliding bar (21), the first sliding bar (20) slides in cooperation with the first sliding groove (22) provided at the bottom of the mounting cavity (2); one end of the first sliding bar (20) is sleeved on the second drive screw. (19) and forms a threaded engagement with the second drive screw (19); the other end of the first sliding bar (20) is bent downward to form an upper contact head (23); the second sliding bar (21) is located below the drive gear (11), and the lower part of the second sliding bar (21) forms a sliding engagement with the second slide groove (24), and the second slide groove (24) is fixedly connected to the horizontal plate (1); a rack (25) is provided on the top of the second sliding bar (21), and the rack (25) meshes with the drive gear (11); the end of the second sliding bar (21) near the upper contact head (23) is bent upward to form a lower contact head (26), and the upper contact head (23) and the lower contact head (26) are opposite to each other;An adaptive adjusting cylinder (27) is provided on the upper contact head (23), and a stop block (28) is provided inside the adaptive adjusting cylinder (27). The stop block (28) and the adaptive adjusting cylinder (27) form a sliding fit, and a buffer spring (29) is provided between the bottom of the stop block (28) and the adaptive adjusting cylinder (27); a stop rod (30) is provided on the lower contact head (26) at a position opposite to the stop block (28).

2. The orthopedic rehabilitation traction system according to claim 1, characterized in that: A speed-changing mechanism is provided at one end of the first drive screw (13) and the second drive screw (19) opposite to each other. The speed-changing mechanism includes a first contact rod (31) and a second contact rod (32). The first contact rod (31) is provided on the first drive screw (13) and is arranged in a cross shape. The second contact rod (32) is provided on the sliding sleeve (33) and is arranged in a cross shape. The sliding sleeve (33) and the square rod (34) fixedly provided at the end of the second drive screw (19) form a sliding fit and are connected to the output end of the adjusting motor (35) provided on the square rod (34). The outer part of the second contact rod (32) is inclined toward the first contact rod (31) to form a speed-changing section (36).

3. The orthopedic rehabilitation traction system according to claim 2, characterized in that: The thigh support plate (3) has an arc-shaped flange (37) at one end away from the hip support area (4).

4. The orthopedic rehabilitation traction system according to claim 3, characterized in that: The foot pedal is an L-shaped pedal (38) arranged side by side on the top surface of the moving plate (6), and the corner of the pedal (38) is hinged to the moving plate (6).

5. The orthopedic rehabilitation traction system according to claim 4, characterized in that: The footrest (38) is provided with a hook-and-loop fastener (39) so that the patient’s foot can be fixed to the footrest (38) by the fastener (39).

6. The orthopedic rehabilitation traction system according to claim 5, characterized in that: The hip support area (4) is provided with a concave arc-shaped groove.

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