Lower limb rehabilitation exercise device for preventing two legs from toppling and working method

Abstract

The invention discloses a lower limb rehabilitation exercise device capable of preventing two legs from toppling and a working method, the lower limb rehabilitation exercise device comprises a front support and a rear support, a left first pulley and a right first pulley are fixed on a top cross beam of the front support, a left second pulley and a right second pulley are fixed on a bottom cross beam of the rear support, and a stand column is arranged in the middle of the bottom cross beam of the rear support. A treadmill is arranged on the upright post; a left variable-diameter wheel and a right variable-diameter wheel are fixed on a top cross beam of the rear bracket; each variable-diameter wheel consists of a small wheel and a large wheel which are coaxial; a first pull rope is fixed and wound on each small wheel, and the free end of each first pull rope penetrates through the first pulley on the same side to be connected with a bandage; a second pull rope is fixed and wound on each large wheel, a hinge piece is installed on a rotating shaft on the outer side of a pedal crank of the treadmill, and the free end of the second pull rope penetrates through the second pulley on the same side to be connected with one end of the hinge piece.

Description

Technical Field

[0001] The present invention relates to the technical field of rehabilitation equipment, and in particular to a lower limb rehabilitation exercise device and a working method thereof. Background Art

[0002] Whether patients suffer from bone injuries, sports injuries, or nerve damage, muscle strength training is integrated throughout the entire rehabilitation process. Different rehabilitation training programs are tailored to each patient's specific situation, and adherence to the principles of gradual rehabilitation training is crucial for achieving rapid recovery. Lower limb injury patients, in particular, require lower limb rehabilitation equipment to strengthen their lower limbs and accelerate muscle recovery.

[0003] Currently, existing lower limb rehabilitation equipment on the market (i.e., equipment that allows patients to perform lower limb rehabilitation exercises while lying in bed) typically uses a stepper to exercise the lower limbs. During use, the patient's feet must be fixed on the stepper pedals. However, since the knees have no support during exercise, the legs can easily fall outward or fall off. To address this, some manufacturers use elastic ropes to tie the knees together. Although this prevents the legs from falling outward, it affects the patient's comfort.

[0004] Therefore, developing a lower limb rehabilitation exercise device that can prevent legs from falling has become one of the technical problems that need to be solved urgently in this field. Summary of the Invention

[0005] The purpose of the present invention is to provide a lower limb rehabilitation exercise device and a working method for preventing legs from falling.

[0006] To achieve the above purpose, the technical solutions adopted by the present invention are as follows:

[0007] A lower limb rehabilitation exercise device for preventing legs from falling over comprises a front support and a rear support, wherein two first pulleys, left and right, are fixed to the top crossbeam of the front support, and two second pulleys, left and right, are fixed to the bottom crossbeam of the rear support, and a column is provided in the middle of the bottom crossbeam of the rear support, and a stepper is mounted on the column;

[0008] The top crossbeam of the rear support is fixed with left and right variable diameter wheels, each variable diameter wheel is composed of a coaxial small wheel and a large wheel;

[0009] A first pull rope is fixed to and wound around each small wheel, and a free end of the first pull rope passes through the first pulley on the same side and is connected to the binding belt;

[0010] A second pull rope is fixed and wound around each large wheel, a hinge is installed on the rotating shaft outside the pedal crank of the stepper, and the free end of the second pull rope passes through the second pulley on the same side and is connected to one end of the hinge.

[0011] Furthermore, the stepper is provided with a left pedal and a right pedal, the lower portion of the pedal is hinged to the rotating shaft outside the pedal crank, and the upper portion of the pedal can slide along the slide.

[0012] Furthermore, the slide is fixed on the back of the stepper.

[0013] Furthermore, a hinged piece is mounted on the rotating shaft outside the pedal crank, and one end of the hinged piece is connected to the free end of the second pull rope.

[0014] Furthermore, the slide is approximately in an inverted U shape as a whole, and its left and right sides are respectively located behind the bottom surfaces of the two foot pedals.

[0015] Furthermore, a first sliding wheel is installed on the back side of the front end of the foot pedal, the outer side of the first sliding wheel is hinged to one end of the connecting plate, and the other end of the connecting plate is hinged to the second sliding wheel, and the second sliding wheel is located on the back side of the slide; when the first sliding wheel slides along the front side of the slide, the second sliding wheel slides along the back side of the slide.

[0016] Furthermore, the front bracket and the rear bracket are both fixed on the base.

[0017] Furthermore, a support leg is provided on each of the left and right sides of the front bracket and the rear bracket.

[0018] Furthermore, the bottoms of the legs on the rear bracket are provided with anti-skid pads.

[0019] The working method of the lower limb rehabilitation exercise device for preventing legs from falling described in the present invention is specifically as follows: when in use, when the left foot pedal moves forward, the right foot pedal moves backward, and at the same time drives the second pull rope on the right to tighten, so that the variable diameter wheel on the right rotates, and the rotation of the variable diameter wheel on the right drives the first pull rope to rotate and tighten in the same direction; when the left foot moves backward, the right foot pedal moves forward, the second pull rope on the right side rotates and releases, and the leg movement pulls the first pull rope, driving the variable diameter wheel to rotate in the opposite direction, and rewinds the second pull rope onto the large wheel of the variable diameter wheel, and repeats this reciprocating motion; the working method of the left pull rope is the same as that of the right pull rope.

[0020] Compared with the prior art, the outstanding effects of the present invention are:

[0021] The lower limb rehabilitation exercise device for preventing legs from falling described in the present invention connects the user's knees and foot pedals through pulleys and straps to form a linkage structure, and changes the pulling direction and speed of the two pull ropes through pulleys and variable-diameter wheels, so that the leg pulling height and speed match the stepping frequency, thereby imitating a normal walking posture. The patient can synchronously assist in lifting his legs during exercise, thereby avoiding problems such as legs falling and feet falling off.

[0022] The lower limb rehabilitation exercise device for preventing legs from falling and the working method of the present invention are further described below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the lower limb rehabilitation exercise device of the present invention.

[0024] Figure 2 Schematic diagram of another structure of the lower limb rehabilitation exercise device of the present invention (the pull rope is not drawn).

[0025] Figure 3 It is a partial structural schematic diagram of the lower limb rehabilitation exercise device of the present invention.

[0026] Among them, 1-front bracket, 2-rear bracket, 3-column, 4-stepper, 41-pedal crank, 42-foot pedal, 43-slide, 44-first sliding wheel, 45-second sliding wheel, 46-connecting plate, 5-first pulley, 6-first pull rope, 7-binding strap, 8-second pulley, 9-second pull rope, 10-reducing wheel, 11-small wheel, 12-large wheel, 13-base, 14-leg, 15-anti-slip pad. DETAILED DESCRIPTION

[0027] like Figure 1-3 As shown, a lower limb rehabilitation exercise device for preventing legs from falling includes a front bracket 1 and a rear bracket 2. Two left and right first pulleys 5 are fixed on the top crossbeam of the front bracket 1, and two left and right second pulleys 8 are fixed on the bottom crossbeam of the rear bracket 2. A column 3 is provided in the middle of the bottom crossbeam of the rear bracket 2, and a stepper 4 is installed on the column 3.

[0028] The stepper 4 is equipped with left and right footrests 42, the lower portions of which are hinged to the rotating shaft outside the pedal crank 41. A slideway 43 is fixed to the back of the stepper 4. The slideway 43 is approximately inverted U-shaped, with its left and right sides located behind the bottom surfaces of the two footrests 42. The upper portions of the footrests 42 can slide along the slideway 43 to constrain the movement of the foot.

[0029] The stepper is a mature component on the market. A motor drives a crank, which is mounted on a pedal. The rear inner side of the pedal 42 is hinged to the crank. A first sliding wheel 44 is mounted on the back of the front end of the pedal 42. The outer side of the first sliding wheel 44 is hinged to one end of a connecting piece 46. The other end of the connecting piece 46 is hinged to a second sliding wheel 45, which is located on the back of a slideway 43. When the first sliding wheel 44 slides along the front of the slideway 43, the second sliding wheel 45 slides along the back of the slideway 43.

[0030] The top crossbeam of the rear support 2 is fixed with two variable diameter wheels 10 on the left and right. Each variable diameter wheel 10 is composed of a coaxial small wheel 11 and a large wheel 12. A first pull rope 6 is fixed and wound around each small wheel 11. The free end of the first pull rope 6 passes through the first pulley 5 on the same side and is connected to the strap 7. The first pull rope structures on the left and right sides are the same. Figure 1 As shown, when in use, the patient passes his legs through the two straps 7, and then fixes his feet on the left and right footrests 42, and the straps 7 fix the patient's legs. When the first pull rope 6 is connected and fixed with the straps 7, its length can be adjusted according to the user's leg length.

[0031] A second pull cord 9 is fixed to and wound around each large wheel 12. The left and right pull cords have the same structure. A hinge is attached to the outer shaft of the pedal crank 41, one end of which is connected to the free end of the second pull cord 9. When the patient steps on the foot pedal 42, the outer shaft of the pedal crank 41 rotates in a circular motion around the central axis of the stepper 4, driving the feet to alternately step and lift. Simultaneously, the front ends of the two foot pedals 42 slide back and forth along the slide 43.

[0032] The front support 1 and the rear support 2 are both fixed on the base 13. A supporting leg 14 is respectively provided on the left and right sides of the front support 1 and the rear support 2. An anti-skid pad 15 is provided at the bottom of the supporting leg 14 on the rear support 2.

[0033] When in use, when the left foot pedal moves forward, the right foot pedal moves backward, and at the same time drives the second pull rope on the right to tighten, so that the variable diameter wheel on the right rotates, and the rotation of the variable diameter wheel on the right drives the first pull rope to rotate in the same direction and tighten; when the left foot moves backward, the right foot pedal moves forward, the second pull rope on the right side rotates and releases, and the leg movement pulls the first pull rope, driving the variable diameter wheel to rotate in the opposite direction, and rewinding the second pull rope onto the large wheel of the variable diameter wheel, and repeating this reciprocating motion; the working method of the left pull rope is the same as that of the right pull rope.

[0034] Clinical use test of the lower limb rehabilitation exercise device for preventing legs from falling down

[0035] 1. Purpose of the Test

[0036] This trial is dedicated to evaluating the effectiveness and safety of a lower limb rehabilitation exercise device designed specifically for bedridden patients in improving lower limb function in patients with lower limb dysfunction. Through a rigorous and scientific testing process, it aims to provide a solid theoretical and practical basis for the device's optimization and upgrading, clinical application, and the development of relevant rehabilitation programs.

[0037] 2. Test Subjects

[0038] This trial rigorously screened 50 eligible patients with lower limb dysfunction, aged 40-70 years. Inclusion criteria included: lower limb dysfunction due to a clear cause, such as stroke or fracture, requiring long-term bed rest for rehabilitation; meeting clinical diagnostic criteria for lower limb dysfunction; a comprehensive examination to exclude serious heart, liver, kidney, or other major organ diseases; and sufficient cooperation to complete all assessments and exercises during the trial.

[0039] Of the 50 patients, 28 were male and 22 were female. The etiology of their condition was as follows: 30 patients suffered lower limb dysfunction due to stroke, and 20 patients suffered fractures. The age distribution was as follows: 15 patients were aged 40-50, 20 were aged 51-60, and 15 were aged 61-70. This sample composition was representative in terms of age, gender, and etiology, helping to ensure the reliability of the test results.

[0040] 3. Test methods

[0041] (1) Device introduction

[0042] The lower limb rehabilitation exercise device used in this trial is specifically designed for bedridden patients and can be placed directly on the bed. While lying flat, the patient's feet rest naturally on the pedals for exercise. The device allows for flexible adjustment of exercise intensity based on the patient's recovery progress. It also features counting and timing functions for accurate recording of exercise volume. Its user-friendly design fully considers the convenience and safety of bedridden patients.

[0043] (2) Usage

[0044] Patients are required to use the device for two 30-minute rehabilitation exercises daily. During the exercise, a therapist will closely monitor the patient's tolerance and gradually adjust the stepping frequency to ensure effective and safe exercise. During first-time use, a therapist will provide one-on-one guidance, helping patients position their feet correctly and master the key techniques and rhythm of the exercise to avoid improper operation that could affect rehabilitation outcomes or cause injury.

[0045] (3) Test cycle

[0046] The trial period was set to 8 weeks. To comprehensively track the patients' recovery progress, various assessment indicators were tested and recorded at three time points: before the start of the trial (baseline), in the fourth week of the trial, and in the eighth week of the trial.

[0047] (IV) Evaluation indicators

[0048] 1. Lower limb muscle strength: The internationally recognized Manual Muscle Testing (MMT) method is used to carefully assess the patient's hip, knee, and ankle flexion and extension muscle strength. Muscle strength is graded from 0 to 5, with 0 indicating complete paralysis and 5 indicating normal muscle strength. Higher grades indicate greater muscle recovery.

[0049] 2. Joint Motion: Use a precise goniometer to measure the range of motion of the patient's hip, knee, and ankle joints in all directions. Record the range of motion in degrees to intuitively reflect the flexibility of the joints.

[0050] 3. Balance ability: The Berg Balance Scale (BBS) is used for assessment. The scale contains 14 targeted items, covering multiple aspects from static balance to dynamic balance, with a total score of 56 points. The higher the score, the stronger the patient's balance ability.

[0051] 4. Daily living activities ability: The Barthel Index (BI) is used for assessment. The BI includes 10 items closely related to daily life, such as eating, washing, dressing, and going to the toilet. The total score is 100 points. The higher the score, the stronger the patient's ability to take care of himself in daily life.

[0052] 5. Safety assessment: Closely observe and record any adverse reactions that occur during the use of the device, such as muscle soreness, joint pain, skin abrasion, etc., and grade the severity of the adverse reactions, and take appropriate treatment measures in a timely manner.

[0053] 4. Test Results

[0054] (1) Changes in lower limb muscle strength

[0055] The specific changes in the patient's lower limb muscle strength before and after the test are shown in the following table:

[0056]

[0057] In this clinical trial, the lower limb muscle strength data changed significantly. From baseline to week 8, the hip flexor strength increased from 2.1±0.5 to 3.5±0.7, an increase of 66.7%. This increase means that the patient's strength is significantly enhanced when performing actions such as leg lifting. Taking daily life scenarios as an example, patients may have difficulty lifting their legs to a certain angle with the bed surface. As muscle strength increases, they can easily complete this action, laying the foundation for subsequent more complex actions such as turning over and sitting up. Hip extensor strength increased from 2.0±0.6 to 3.4±0.8, an increase of 70%, making patients more powerful when extending their legs backward and better able to control leg movements when adjusting their body position.

[0058] Knee flexor strength increased from 1.9±0.5 to 3.3±0.7, an increase of 73.7%, which greatly helps patients when bending their knee joints. When simulating walking movements, stronger knee flexor strength allows patients to bend their knees more naturally and drive their calves to swing. Knee extensor strength increased from 2.0±0.6 to 3.4±0.8, an increase of 70%. During standing and walking, it can effectively enhance the support capacity of the knee joint and reduce the risk of falls caused by knee joint weakness. Ankle dorsiflexor strength increased from 1.8±0.4 to 3.2±0.6, an increase of 77.8%. This makes it easier for patients to lift their toes when walking, avoid tripping due to dragging their toes on the ground, and improve walking posture. Ankle plantar flexor strength increased from 1.9±0.5 to 3.3±0.7, an increase of 73.7%, playing an important role in pushing off the ground and providing more powerful propulsion for walking. Moreover, compared with the baseline at week 8, the differences in all indicators were statistically significant (P<0.05), which fully demonstrated the effectiveness of the device in improving lower limb muscle strength.

[0059] (2) Changes in joint range of motion

[0060] The changes in the patients' joint range of motion before and after the test (unit: degrees) are shown in the following table:

[0061]

[0062] After the 8-week trial period, the range of motion of each joint increased significantly. The range of motion of the hip flexion increased from 65.2±10.3 degrees to 85.8±10.6 degrees, an increase of 20.6 degrees, an increase of 31.6%. This allows patients to have a wider range of motion when performing hip flexion movements. For example, when lying on the side, it is easier to bend the upper leg close to the body, improving comfort and position adjustment ability when lying in bed. Hip extension increased from 15.3±5.2 degrees to 25.6±5.4 degrees, an increase of 10.3 degrees, an increase of 67.3%, allowing patients to reach a larger angle when extending their hip joints, such as extending their legs backward, which helps improve their stride and body balance when walking.

[0063] Knee flexion increased from 70.5±12.1 degrees to 95.6±12.5 degrees, an increase of 25.1 degrees, or 35.6%. This change is crucial for the normal force exerted by the knee joint when the patient stands and walks. During simulated walking, a larger knee flexion angle can make the calf more flexible when swinging, closer to a normal walking gait. Knee extension increased from 10.2±4.3 degrees to 20.5±4.6 degrees, an increase of 10.3 degrees, or 100.9%, greatly improving the extension function of the knee joint, allowing the patient's knee joint to support the body weight more stably when standing, reducing the instability caused by knee flexion.

[0064] The ankle dorsiflexion increased from 5.1±3.2 degrees to 12.3±3.5 degrees, an increase of 7.2 degrees, an increase of 141.2%, effectively alleviating the foot drop phenomenon. When the patient walks, the ankle joint can better dorsiflex, making the angle between the foot and the calf more reasonable, improving the flexibility of the foot, and avoiding gait abnormalities caused by excessive toe drop when walking. The ankle plantar flexion increased from 15.2±6.1 degrees to 25.5±6.3 degrees, an increase of 10.3 degrees, an increase of 67.8%. During the push-off action, a larger plantar flexion angle can provide the body with a stronger forward propulsion force, improving the efficiency and stability of walking. The differences in each indicator compared with the baseline were statistically significant (P<0.05), indicating that the device has a significant effect on improving joint mobility.

[0065] (3) Changes in balance ability

[0066] The changes in the patients' Berg Balance Scale scores are as follows:

[0067] Evaluation Time Score (points) Baseline 25.3±6.5 Week 4 35.6±7.2 Week 8 45.8±7.5

[0068] After 8 weeks, the patients' balance ability scores increased from 25.3±6.5 points to 45.8±7.5 points, an increase of 20.5 points, an increase of 81%, and the difference was statistically significant compared with the baseline (P<0.05). The Berg Balance Scale covers a variety of balance test items from static to dynamic. The significant improvement in scores indicates that the patients' balance ability has improved in many aspects. In terms of static balance, patients can maintain sitting and standing postures more stably and reduce body shaking. For example, when sitting on the edge of the bed, they may have needed to rely on support such as armrests to maintain balance in the past. As their balance ability improves after training, they can sit and stand stably for longer periods of time without support.

[0069] In terms of dynamic balance, patients have enhanced balance control during movements such as turning and walking. While walking, they are better able to adjust their center of gravity, maintain a stable walking path, and reduce the risk of swaying and falling due to an unstable center of gravity. This improvement in balance is the result of increased lower limb muscle strength and improved joint mobility. Increased lower limb muscle strength enables patients to more effectively control their body posture, while increased joint mobility allows for more flexible joint movement when adjusting their center of gravity, thereby better maintaining balance.

[0070] (4) Changes in daily living activities

[0071] The changes in the patients' Barthel index scores are as follows:

[0072] Evaluation Time Score (points) Baseline 45.2±10.3 Week 4 60.5±11.2 Week 8 75.8±12.1

[0073] After 8 weeks, the Barthel index increased from 45.2±10.3 points to 75.8±12.1 points, an increase of 30.6 points, an increase of 67.7%, and the difference was statistically significant compared with the baseline (P<0.05). The Barthel index is used to assess the patient's self-care ability in 10 daily life items such as eating, washing, dressing, and going to the toilet. The substantial improvement in scores fully demonstrates the positive impact of the device on the patient's quality of life. In terms of eating, due to improved lower limb function and enhanced body stability, patients can sit at the dining table more easily and maintain a stable posture to eat without much assistance from others.

[0074] When washing, patients can better control their body position and stand in front of the sink to perform actions such as brushing their teeth and washing their face. During the dressing process, due to the improvement of lower limb muscle strength and joint mobility, patients can lift their legs more freely and put on pants and other clothes, and their self-care ability is significantly improved. When going to the toilet, patients can stand up and sit down more stably to complete the excretion action and reduce their dependence on others. These improvements in daily living activities not only improve the convenience of patients' lives, but also greatly enhance their self-esteem and sense of happiness in life, enabling patients to better integrate into daily life and reduce the psychological pressure caused by limited physical functions.

[0075] (V) Safety Assessment

[0076] Throughout the trial, only three patients experienced mild muscle soreness. These symptoms were effectively alleviated with measures such as rest, local massage, and device adjustment, without disrupting the trial. No serious adverse reactions were observed during the trial, demonstrating the device's high safety.

[0077] V. Discussion and Analysis

[0078] (1) Effectiveness analysis

[0079] According to the comprehensive test results, after 8 weeks of continuous use, the patients' lower limb muscle strength, joint mobility, balance ability and daily living activities have been significantly improved, which fully confirms the effectiveness of the device in promoting lower limb rehabilitation of bedridden patients.

[0080] From the perspective of rehabilitation mechanism, the device of the present invention continuously stimulates the lower limb muscles by guiding the patient to perform regular pedaling exercises, prompting the muscles to continuously contract and relax, increasing the load on the muscles, and thus achieving an improvement in lower limb muscle strength. At the same time, regular exercise promotes the circulation of synovial fluid, improves the lubrication and nutrition supply of the joints, effectively reduces joint adhesions, and thus increases joint mobility. As the lower limb function gradually improves, the patient's body control ability is enhanced, and the balance ability is also improved, making it easier to complete various movements in daily life activities, ultimately achieving an improvement in the ability to carry out daily activities.

[0081] (2) Safety analysis

[0082] Adverse reactions experienced during the trial were all mild and resolvable with simple measures, demonstrating the device's safety. Muscle soreness, which occurred, was primarily related to the patient's initial muscle discomfort with regular exercise. These symptoms resolved naturally as the body adapted to the intensity of the exercise.

[0083] (3) Comparison with other devices

[0084] Compared with some lower limb rehabilitation devices on the market that require patients to sit or stand up, the device of the present invention has unique advantages. It is designed specifically for bedridden patients and can be used for exercise without the patient changing his or her body position, which greatly expands the scope of applicable population. In particular, it provides a practical and feasible way of rehabilitation exercise for those patients with serious conditions who cannot sit or stand up.

[0085] At the same time, the device is easy to operate and easy for patients to understand and master. It can accurately adjust the exercise intensity according to the rehabilitation stage and physical condition of different patients to meet personalized rehabilitation needs.

[0086] VI. Conclusion

[0087] The results of this clinical trial clearly demonstrate the effectiveness and safety of a lower limb rehabilitation exercise device designed to prevent leg collapse while lying in bed for bedridden patients with lower limb dysfunction. The device significantly improves patients' lower limb muscle strength, joint range of motion, balance, and activities of daily living, with minimal and manageable adverse reactions.

[0088] Based on the above conclusions, this device can be promoted as an effective rehabilitation aid for bedridden patients with lower limb dysfunction in clinical applications. During actual use, medical staff should closely monitor individual patient conditions, adjust exercise intensity based on their tolerance and recovery progress, and monitor patient responses to address any adverse reactions promptly.

[0089] The embodiments described above are merely descriptions of preferred implementations of the present invention and are not intended to limit the scope of the present invention. They should not be construed as limitations on the present invention. Without departing from the spirit of the present invention, various modifications and improvements to the technical solutions of the present invention made by ordinary technicians in this field should fall within the scope of protection determined by the claims of the present invention.

Claims

1. A lower limb rehabilitation exercise device for preventing legs from falling, characterized by: The invention comprises a front bracket (1) and a rear bracket (2), wherein two first pulleys (5) are fixed on the top crossbeam of the front bracket (1), two second pulleys (8) are fixed on the bottom crossbeam of the rear bracket (2), and a column (3) is provided in the middle of the bottom crossbeam of the rear bracket (2), and a stepper (4) is installed on the column (3); Two variable-diameter wheels (10) are fixed on the top crossbeam of the rear support (2), and each variable-diameter wheel (10) is composed of a coaxial small wheel (11) and a large wheel (12); A first pull rope (6) is fixed and wound around each small wheel (11), and a free end of the first pull rope (6) passes through the first pulley (5) on the same side and is connected to the binding belt (7); A second pull rope (9) is fixed and wound around each large wheel (12), and a hinge is installed on the rotating shaft outside the pedal crank (41) of the stepper (4). The free end of the second pull rope (9) passes through the second pulley (8) on the same side and is connected to one end of the hinge.

2. The lower limb rehabilitation exercise device for preventing legs from falling down according to claim 1, characterized in that: The stepper (4) is provided with left and right foot pedals (42). The lower portion of the foot pedal (42) is hinged to the rotating shaft outside the pedal crank (41), and the upper portion of the foot pedal (42) can slide along the slideway (43).

3. The lower limb rehabilitation exercise device for preventing legs from falling down according to claim 2, characterized in that: The slideway (43) is fixed on the back side of the stepper (4).

4. The lower limb rehabilitation exercise device for preventing legs from falling down according to claim 3, characterized in that: The slideway (43) is approximately in an inverted U shape as a whole, and its left and right sides are respectively located behind the bottom surfaces of the two footrests (42).

5. The lower limb rehabilitation exercise device for preventing legs from falling down according to claim 4, characterized in that: A first sliding wheel (44) is mounted on the back of the front end of the foot pedal (42). The outer side of the first sliding wheel (44) is hinged to one end of a connecting piece (46). The other end of the connecting piece (46) is hinged to a second sliding wheel (45). The second sliding wheel (45) is located on the back of the slideway (43). When the first sliding wheel (44) slides along the front of the slideway (43), the second sliding wheel (45) slides along the back of the slideway (43).

6. The lower limb rehabilitation exercise device for preventing legs from falling down according to claim 5, characterized in that: The front bracket (1) and the rear bracket (2) are both fixed on the base (13).

7. The operating method of the lower limb rehabilitation exercise device for preventing legs from falling down according to any one of claims 1 to 6, characterized in that: When in use, when the left foot pedal moves forward, the right foot pedal moves backward, and at the same time drives the second pull rope on the right to tighten, so that the variable diameter wheel on the right rotates, and the rotation of the variable diameter wheel on the right drives the first pull rope to rotate in the same direction and tighten; when the left foot moves backward, the right foot pedal moves forward, the second pull rope on the right side rotates and releases, and the leg movement pulls the first pull rope, driving the variable diameter wheel to rotate in the opposite direction, and rewinding the second pull rope onto the large wheel of the variable diameter wheel, and repeating this reciprocating motion; the working method of the left pull rope is the same as that of the right pull rope.

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