Training device for postoperative rehabilitation of knee arthritis patient

Abstract

The invention relates to the technical field of medical rehabilitation, in particular to a training device for postoperative rehabilitation of knee arthritis patients, which comprises a fixing plate, leg lifting assemblies are symmetrically arranged on the fixing plate, sliding groove assemblies are arranged between the leg lifting assemblies and the fixing plate, and pedal assemblies are symmetrically arranged on the sliding groove assemblies; symmetrical air bag assemblies are arranged on the inner sides of the leg lifting assemblies, a reset assembly is further fixedly connected to the fixing plate, the air bag assemblies communicate with the two ends of the reset assembly correspondingly, and the reset assembly is used for pushing the air bag assemblies to reset based on sensing information of the air bag assemblies so as to correct the posture of a patient. Elastic assemblies used for sensing the inward turning or outward turning condition of the foot sole of the patient during rehabilitation training are symmetrically arranged on the side, close to the pedal assembly, of the fixing plate, one end of each elastic assembly is fixedly connected with the pedal assembly, and the other end of each elastic assembly is hinged to the reset assembly. Through a closed-loop feedback mechanism of air bag induction and mechanical linkage, real-time detection and dynamic correction of abnormal postures of multiple joints of the lower limb are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of medical rehabilitation, and in particular to a training device for postoperative rehabilitation of patients with knee arthritis. Background Art

[0002] Knee arthritis is a common joint disease, which is mainly manifested by wear and degeneration of the knee cartilage, and bone hyperplasia around the joint, leading to symptoms such as joint pain, swelling, and limited movement. For patients with severe knee arthritis, surgical treatment is often necessary. However, it is crucial for patients to recover their knee joint function after surgery. Without timely and effective rehabilitation training, the patient's knee joint range of motion will be limited, muscle strength will be weakened, and joint stability will also be reduced, which will affect the surgical effect and the patient's quality of life. Therefore, postoperative rehabilitation training is extremely important for patients with knee arthritis to restore joint function, enhance muscle strength, improve joint stability, and promote physical recovery.

[0003] Existing postoperative rehabilitation training devices for knee arthritis have, to a certain extent, replaced manual assistance in patient leg movements for rehabilitation training. For example, the patent document with publication number CN119235598A discloses a postoperative rehabilitation training device and system for knee joint, which includes: a seat, a mounting frame, a limb support mechanism, and a driving mechanism; by padding and restraining the thigh and calf at both ends of the knee joint respectively, and by driving the rotation and sliding of the calf, the lower limbs are driven to perform flexion and extension movements of the knee joint; through convenient switching operations, active and passive training modes are switched; through the telescopic structure of the thigh placement slot plate and the calf placement slot plate, it can be adapted to patients with different lower limb lengths for use, thereby improving the adaptability of the size structure.

[0004] However, after knee arthritis surgery, patients may have muscle strength imbalance problems. For example, postoperative immobilization causes the quadriceps muscle strength to decrease faster than the lateral muscle groups. Existing rehabilitation training devices, such as hinged knee orthoses, only limit the range of motion of the legs and cannot sense and correct abnormal inversion or valgus postures during training in real time, which can easily cause abnormal stress concentration on the joint surface. At the same time, most existing devices, including the above-mentioned patents, do not take into account the inversion or valgus of the patient's feet that may occur during training. They cannot apply effective corrective force to the patient's feet, making it difficult to synchronously correct the lower limb force line, which is not conducive to the patient's overall recovery. In addition, existing rehabilitation training devices are usually unable to flexibly adjust the bending height between the thigh support plate and the calf support plate according to the different needs of the patient's postoperative rehabilitation stage, and cannot meet the patient's training requirements at different rehabilitation stages, limiting the effectiveness of rehabilitation training. Therefore, it is necessary to propose a training device for postoperative rehabilitation of knee arthritis patients that can monitor and correct the patient's leg muscle movements in real time during training. Summary of the Invention

[0005] To solve the above problems, the present invention provides a training device for postoperative rehabilitation of patients with knee arthritis, which realizes real-time detection and dynamic correction of abnormal postures of multiple joints of the lower limbs through a closed-loop feedback mechanism of airbag sensing and mechanical linkage.

[0006] To achieve the above-mentioned objectives, the technical solution of the present invention is as follows: a training device for postoperative rehabilitation of patients with knee arthritis, comprising a fixing plate, symmetrically provided on the fixing plate with leg-lifting assemblies for placing the patient's legs and bending with the patient's movements, a slide assemblies for sliding the leg-lifting assemblies provided between the leg-lifting assemblies and the fixing plate, and pedal assemblies symmetrically provided on the slide assemblies for placing the patient's feet;

[0007] Symmetrical airbag assemblies are provided on the inner sides of the leg-lifting assemblies. The airbag assemblies are used to sense the inversion or eversion of the patient's leg muscles during rehabilitation training. Symmetrically arranged reset assemblies are also fixedly connected to the fixing plate. The airbag assemblies are respectively connected to the two ends of the reset assemblies. The reset assemblies are used to push the airbag assemblies to reset based on the sensing information of the airbag assemblies to correct the patient's posture. Elastic assemblies for sensing the inversion or eversion of the patient's feet during rehabilitation training are symmetrically provided on one side of the fixing plate close to the pedal assembly. One end of the elastic assemblies is fixedly connected to the pedal assembly, and the other end of the elastic assemblies is hinged to the reset assembly.

[0008] The elastic components include a reel and a base, the base is fixedly connected to the fixed plate, two ends of the reel are respectively rotatably connected to the inner wall of the fixed plate, the reel is fixedly connected with an elastic rope, the two ends of the elastic rope are respectively fixedly connected to the opposite side of the pedal assembly, one end of the reel is fixedly connected to a transmission rod, the transmission rod passes through the side wall of the base and is fixedly connected to a first connecting rod, the end of the first connecting rod away from the transmission rod is hinged to a second connecting rod, and the end of the second connecting rod away from the first connecting rod is hinged to the reset assembly.

[0009] The technical principles of the above scheme are as follows:

[0010] The patient lies flat on their back to train with the device, placing their legs within the corresponding leg-lift assembly and pedal assembly. The leg-lift assembly slides with the fixed plate via a slide assembly. As the patient flexes and extends the knee, the leg-lift assembly's sliding trajectory along the guide rail dynamically matches the instantaneous center of rotation of the knee joint. When the patient's leg varuses or valgus during training, the inner thigh or calf muscles squeeze the corresponding airbag assembly. The compressed airbag assembly then flows through a pipeline into the reset assembly, which in turn pushes the airbag assembly back to inflate, correcting and reminding the patient's leg.

[0011] When the second link is displaced by the reset assembly, it drives the transmission rod to rotate the drum, causing the elastic cord to apply a pulling force to one side of the pedal assembly. If the patient's foot is inverted, the elastic cord tightens the outer elastic cord through the drum, generating an outward corrective torque. If the foot is inverted, the inner elastic cord tightens, creating an inward pulling feedback. This process, through the design of the link-drum transmission ratio, amplifies the tiny displacement of the airbag assembly under pressure into an effective corrective movement of the foot.

[0012] The above scheme has the following beneficial effects:

[0013] 1. In this solution, the leg-lifting assembly forms a sliding connection with the fixed plate through a slide assembly. When the patient performs knee flexion and extension training, the sliding trajectory of the slide accurately simulates the motion path of the instantaneous rotation center of the human knee joint. This structural design breaks through the limitations of traditional fixed-axis rehabilitation equipment, so that the axis of joint movement during training always maintains dynamic consistency with the physiological kinematic characteristics of the human body, significantly reducing the abnormal stress distribution of artificial joint prostheses or postoperative knee joints during training, and effectively avoiding secondary soft tissue damage caused by the mismatch between the mechanical motion trajectory and the biological joint.

[0014] 2. In this solution, the airbag assembly, symmetrically located on the inside of the leg-lifting assembly, senses the patient's leg inversion or varus tendency in real time. When varus or varus occurs, the pressure-side airbag triggers the reset assembly through changes in air pressure. The reset assembly uses a bidirectional air pressure drive mechanism. On the one hand, gas recirculation pushes the deformed airbag back to its original shape, creating immediate physical resistance to abnormal posture. On the other hand, the air pressure signal is synchronously converted into mechanical thrust, acting in reverse on the leg-lifting assembly to generate a corrective torque. This dual-action mechanism provides biomechanical feedback on abnormal movement patterns, completing active intervention before the patient has formed a memory of the incorrect movement, and strengthening the retraining process of the proprioceptive nerves.

[0015] 3. This solution utilizes a rigid connection between the transmission rod and the reel, combined with a slider-crank mechanism formed by the first and second connecting rods, to amplify the minute displacements of the airbag assembly through the lever principle. When the airbag is compressed, causing the second connecting rod to displace, this multi-stage connecting rod drive generates rotational motion in the reel, resulting in a nonlinear increase in the tension exerted by the elastic cord on the pedal assembly. This solution transcends the limitations of linear deformation of traditional elastic elements, providing significant corrective torque even at the earliest stages of abnormal foot posture. Furthermore, an optimized transmission ratio ensures the spatiotemporal synchronization of corrective foot movements with knee joint posture adjustments.

[0016] 4. In this solution, when the knee joint is inverted, the corrective action triggered by the airbag assembly is transmitted to the elastic assembly via the reset assembly, simultaneously triggering elastic cord traction feedback in the foot pedal area. This cross-joint linkage mechanism conforms to the transmission principles of the human kinetic chain. While correcting abnormal knee posture, it also guides the patient to independently adjust the overall force line of the lower limb by reshaping the plantar pressure distribution, forming a closed-loop correction circuit from distal to proximal, significantly improving the effectiveness of neuromuscular control training.

[0017] Furthermore, the leg lifting assemblies include a thigh placement board and a calf placement board, a rotating rod is hinged between the thigh placement board and the calf placement board, and a first slider is hinged on the side of the calf placement board away from the rotating rod, and the first slider is slidably engaged with the slide assembly.

[0018] Beneficial effect: When the patient performs knee flexion training, the first slider slides along the limiting track of the slide assembly, driving the axis of the rotating rod to produce displacement compensation, so that the hinge axis tracks the dynamic changes of the instantaneous rotation center of the human knee joint in real time.

[0019] Furthermore, the slide assembly includes a base plate fixedly connected to the fixed plate, symmetrically arranged guide rails are fixedly connected to the base plate, and the first sliding blocks are respectively slidably fitted in the corresponding guide rails.

[0020] Beneficial effect: The symmetrically arranged guide rails are calibrated with high-precision parallelism to form a rigid guide track, and the first slider only retains a single degree of freedom to slide under the geometric constraints of the double-sided guide rails.

[0021] Furthermore, the airbag assembly includes a first airbag symmetrically arranged in the thigh placement board and a second airbag symmetrically arranged in the calf placement board, and the first airbag and the second airbag are both connected to the reset assembly.

[0022] Beneficial Effects: The first and second airbags, symmetrically distributed on the thigh and calf support plates, form a dual-node pressure sensing array that captures multi-dimensional abnormal torques, such as femoral internal rotation / external rotation and tibial varus / valgus, in real time. When quadriceps muscle weakness weakens, causing femoral internal rotation, the medial airbag becomes compressed, identifying early compensatory postural abnormalities through differences in the rate of change of air pressure. When the medial airbag becomes compressed, air is rapidly injected into the reset assembly.

[0023] Furthermore, the reset assemblies each include a reset cylinder, each of which is fixedly connected to a fixed plate near one side of the base, and each of which is slidably connected to a first piston plate and a second piston plate. The first piston plate and the second piston plate separate the reset cylinder into a first air chamber, a hydraulic chamber, and a second air chamber from left to right. An air pipe is connected between one end of the first air chamber and the second air chamber away from the hydraulic chamber and the first air bag and the second air bag on the same side.

[0024] A hydraulic piston is fixedly connected to the hydraulic cavity, and a hydraulic hole is opened on the hydraulic piston. A first piston rod and a second piston rod are fixedly connected between the first piston plate and the second piston plate on both sides of the hydraulic piston respectively. A first spring and a second spring are also fixedly connected between the first piston plate and the second piston plate on both sides of the hydraulic piston. The first spring and the second spring are respectively sleeved on the first piston rod and the second piston rod.

[0025] Beneficial Effects: The first and second piston plates convert air pressure signals into reciprocating motion in the hydraulic chamber. The flow resistance effect created by the hydraulic piston damping orifice converts the discrete air pressure fluctuations of the airbag assembly into continuous hydraulic thrust. The first and second springs are preloaded and sleeved onto the piston rod, storing hydraulic damping energy during the piston plate's compression phase and releasing it during the return stroke to generate reverse thrust through elastic potential energy. This mechanism completes energy circulation within a single flexion and extension cycle, ensuring both instantaneous bursts of corrective force and maintaining thrust stability through the stiffness gradient design of the first and second springs, preventing muscle spasms caused by rigid impacts.

[0026] Furthermore, permanent magnets are embedded in the first piston plate and the second piston plate, and the reset cylinder is sleeved with the first magnetic ring and the second magnetic ring corresponding to the first piston plate and the second piston plate, and the outer walls of the first magnetic ring and the second magnetic ring are respectively hinged to the second connecting rod located on the same side.

[0027] Beneficial effects: The permanent magnets embedded in the first piston plate and the second piston plate form a closed magnetic circuit with the first magnetic ring and the second magnetic ring on the outer wall of the reset cylinder, and the contactless transmission of the piston linear motion to the swing of the second connecting rod is achieved through the magnetic attraction force, and then the linear motion is converted into the axial rotational motion of the first connecting rod through the second connecting rod. By tightening the reel, the elastic rope is tightened, thereby correcting the left and right flipping of the foot.

[0028] Furthermore, the pedal assembly includes a foot pedal and a rotating shaft. The foot pedal is hinged on the rotating shaft. Both ends of the rotating shaft are rotatably connected to a second slider that slides with the guide rail. The ends of the guide rails are fixedly connected to spring steel, and the ends of the spring steel away from the ends of the guide rails are fixedly connected to the second slider.

[0029] Beneficial effects: The pedal forms a composite hinge structure with the second slider through a rotating shaft, allowing the foot to generate ±5° of micro-motion freedom in the sagittal plane (flexion and extension), coronal plane (inversion / eversion), and horizontal plane (internal / external rotation). The increasing stiffness curve of the spring steel forms an elastic constraint with the end of the guide rail. When the patient relaxes his legs, the acceleration of gravity of the calf triggers the high-speed sliding of the second slider. The spring steel absorbs more than 85% of the kinetic energy through the plastic deformation zone, limiting the peak impact force of the tibiofemoral joint, which is significantly lower than that of traditional limit blocks, effectively protecting the microstructural integrity of the bone interface.

[0030] Furthermore, the guide rail is symmetrically provided with adjustment components for adjusting the bending height between the thigh placement board and the calf placement board, and the adjustment components include a limit block fixedly connected to the guide rail, a manual knob is provided on one side of the limit block, the manual knob is divided into several scales, and a knob shaft is fixedly connected to one side of the manual knob, the knob shaft passes through the limit block and is fixedly connected to a worm, a worm gear is engaged with one side of the worm, and the worm gear is coaxially fixedly connected to a lead screw, the bottom end of the lead screw passes through the fixed plate and is rotatably connected to the bottom of the fixed plate, the top end of the lead screw is fixedly connected to a telescopic rod, the top end of the telescopic rod is fixedly connected to a fixing ring, the fixing ring is sleeved on the rotating rod, a third spring is sleeved on the telescopic rod, and both ends of the third spring are fixedly connected to the fixing ring and the lead screw respectively.

[0031] Beneficial effects: The transmission pair composed of the worm and the worm wheel has a one-way self-locking feature, ensuring that the angle is fixed without retreat after the manual knob is adjusted. The screw driven by the worm wheel converts the rotational motion into the axial displacement of the telescopic rod, and cooperates with the fixed ring to dynamically adjust the fulcrum of the rotating rod to achieve stepless and continuous changes in the angle between the thigh and calf placement plates.

[0032] Furthermore, sponge pads are provided on the inner sides of the thigh placement board and the calf placement board.

[0033] Beneficial Effects: The porous structure of the sponge cushion disperses contact pressure on the leg through deformation when under pressure, conforming to the body's curves to prevent limb slippage during training. When the patient performs leg lifts and knee bends, the sponge cushion elastically adapts to the changing leg posture, reducing shear force and friction damage to the skin while maintaining a dry contact surface thanks to the breathable design.

[0034] Furthermore, elastic straps are provided on both sides of the footrest, thigh placement board and calf placement board.

[0035] Beneficial effects: Using elastic bandages to fix the patient's legs during training can prevent abnormal joint displacement after surgery and avoid muscle atrophy and blood flow restriction caused by rigid fixation.

[0036] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is an axonometric diagram of an embodiment of a training device for postoperative rehabilitation of patients with knee arthritis according to the present invention;

[0038] Figure 2 A schematic isometric cross-sectional view of a reduction cylinder of an embodiment of a training device for postoperative rehabilitation of knee arthritis patients according to the present invention;

[0039] Figure 3 This is an axonometric diagram of an adjustment assembly of an embodiment of a training device for postoperative rehabilitation of knee arthritis patients according to the present invention;

[0040] Figure 4 A schematic top view of an elastic component of an embodiment of a training device for postoperative rehabilitation of knee arthritis patients according to the present invention;

[0041] Figure 5 This is an axonometric diagram of the elastic component of an embodiment of a training device for postoperative rehabilitation of knee arthritis patients according to the present invention.

[0042] The reference numerals in the drawings of the specification include: 1, fixing plate; 2, guide rail; 3, thigh placement plate; 4, first airbag; 5, fixing ring; 6, rotating rod; 7, third spring; 8, telescopic rod; 9, screw rod; 10, trachea; 11, reset cylinder; 12, spring steel; 13, second slider; 14, rotating shaft; 15, foot pedal; 16, second airbag; 17, calf placement plate; 18, second air chamber; 19, second piston plate; 2 0. Second spring; 21. Second piston rod; 22. Hydraulic hole; 23. Hydraulic piston; 24. Hydraulic chamber; 25. First piston plate; 26. First air chamber; 27. First magnetic ring; 28. Second magnetic ring; 29. Worm gear; 30. Worm; 31. Knob shaft; 32. Limit block; 33. Elastic strap; 34. Elastic rope; 35. Base; 36. Reel; 37. Drive rod; 38. First connecting rod; 39. Second connecting rod. DETAILED DESCRIPTION

[0043] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0044] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0045] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0046] The following is further described in detail through specific implementation methods:

[0047] Example 1:

[0048] As attached Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5 Shown is a training device for postoperative rehabilitation of patients with knee arthritis, comprising a fixing plate 1, on which are symmetrically provided leg-lifting assemblies for the patient to place his legs and bend as the patient moves; a slide assemblies for the leg-lifting assemblies to slide are provided between the leg-lifting assemblies and the fixing plate 1, and pedal assemblies for the patient to place his feet are symmetrically provided on the slide assemblies.

[0049] Specifically, the leg-lifting assembly includes a thigh rest plate 3 and a calf rest plate 17. When training, the patient fixes the fixing plate 1 on the bed or a certain plane, and places the legs in the depressions of the thigh rest plate 3 and the calf rest plate 17. Since the leg muscles of patients are swollen and the skin is sensitive after surgery, if they directly contact the rigid plate, it is easy to cause pressure sores or training resistance. Therefore, a sponge pad layer is provided on the inner side of the thigh rest plate 3 and the calf rest plate 17. The sponge pad layer disperses the contact pressure of the leg by deformation when under pressure, and at the same time conforms to the curve of the human body to avoid limb sliding and displacement during training. When the patient performs the leg-lifting and knee-bending movement, the sponge pad layer adapts to the change of leg posture through elastic deformation, which not only reduces the friction damage of shear force to the skin, but also keeps the contact surface dry through the air vent design, thereby improving the patient's comfort during training and reducing the pressure sore rate.

[0050] A rotating rod 6 is hinged between the thigh placement plate 3 and the calf placement plate 17, and a first slider is hinged on the side of the calf placement plate 17 away from the rotating rod 6. The first sliders are slidably matched with the slide assembly. The slide assembly includes a base plate fixedly connected to the fixed plate 1, and symmetrically arranged guide rails 2 are fixedly connected to the base plate. The first sliders are slidably matched in the corresponding guide rails 2. When the patient actively flexes his knee, the rotating rod 6 rotates axially and drives the calf placement plate 17 to rotate axially. At this time, the first slider slides in the guide rail 2, so that the axis of the rotating rod 6 dynamically approaches the real knee joint rotation center, reducing abnormal ligament traction.

[0051] After knee arthritis surgery, postoperative immobilization causes the quadriceps muscle strength to decrease faster than the lateral muscle groups, reducing the dynamic stability of the knee joint. When patients perform knee flexion training, the femoral internal rotation torque is greater than the external rotation torque when the knee is flexed, causing a tendency for the knee joint to valgus, resulting in excessive stretching of the lateral collateral ligament, and then the expansion of the lateral space of the joint cavity. If the knee joint is varus > 5° when the knee is flexed, healthy people can compensate through gastrocnemius muscle contraction, but patients have no autonomous feedback mechanism after surgery. When the knee is flexed 60°, the contact pressure of the medial tibiofemoral joint can reach 3.2 times the body weight, accelerating the wear of the prosthetic polyethylene liner. Existing rehabilitation training devices, such as hinged knee orthoses, only limit the range of motion of the legs and cannot provide dynamic resistance for muscle strength imbalance. Therefore, in this solution, symmetrical airbag assemblies are provided on the inner sides of the thigh placement board 3 and the calf placement board 17. The airbag assemblies are used to sense the inversion or eversion of the patient's leg muscles during rehabilitation training. The airbag assemblies include a first airbag 4 symmetrically arranged in the thigh placement board 3 and a second airbag 16 symmetrically arranged in the calf placement board 17. A symmetrically arranged reset assembly is fixedly connected to the fixed plate 1. The first airbag 4 and the second airbag 16 are both connected to the reset assembly. When the quadriceps muscle is weak and causes internal rotation of the femur, the first airbag 4 and the second airbag 16 located on the inner side of the leg are pressurized, and the internal gas is transmitted to the reset assembly. When the gas is discharged to the reset assembly through the first airbag 4 and the second airbag 16, the reset assembly pushes the gas back to the first airbag 4 and the second airbag 16 in the reverse direction to remind and help the patient correct the problem of internal rotation of the quadriceps muscle.

[0052] The reset assembly is used to push the airbag assembly to reset based on the sensing information of the airbag assembly to correct the patient's posture. The reset assembly includes a reset cylinder 11, which is fixedly connected to the fixed plate 1. The first piston plate 25 and the second piston plate 19 are slidably connected inside the reset cylinder 11. The first piston plate 25 and the second piston plate 19 divide the interior of the reset cylinder 11 into a first air chamber 26, a hydraulic chamber 24 and a second air chamber 18 from left to right. The first air chamber 26 and the second air chamber 18 are connected to the end away from the hydraulic chamber 24 by a trachea 10 with the first airbag 4 and the second airbag 16 on the same side.

[0053] The hydraulic chamber 24 is fixedly connected with a hydraulic piston 23, and a hydraulic hole 22 is opened on the hydraulic piston 23. The first piston rod and the second piston rod 21 are fixedly connected between the first piston plate 25 and the second piston plate 19 on both sides of the hydraulic piston 23. The first spring and the second spring 20 are also fixedly connected between the first piston plate 25 and the second piston plate 19 on both sides of the hydraulic piston 23. The first spring and the second spring 20 are respectively sleeved on the first piston rod and the second piston rod 21. When the gas in the first air bag 4 and the second air bag 16 located on the inner side of the leg enters the first air chamber 26, the internal air pressure pushes the first piston plate 25 to move right. At this time, the gas in the hydraulic chamber 24 The hydraulic oil produces a damping effect through the hydraulic hole 22 of the hydraulic piston 23, that is, the hydraulic oil on the left side of the hydraulic piston 23 enters the chamber on the right side of the hydraulic piston 23. However, since the gas in the second air chamber 18 on the right side and the first air bag 4 and the second air bag 16 on the right side is not squeezed, the internal gas remains within a constant threshold range and cannot be further pushed to expand the second piston plate 19. Therefore, the hydraulic oil on the right side of the hydraulic piston 23 cannot be pushed to the right, and can only be reversely transported back to the chamber on the left side of the hydraulic piston 23 through the hydraulic hole 22, and cooperate with the elastic energy storage of the first spring to form a progressive resistance, pushing the first piston plate 25 in the opposite direction to the left (refer to Figure 2 As shown), the gas is squeezed back into the first airbag 4 and the second airbag 16 located on the inner side of the leg. The patient feels the reverse inflation and squeezing of the first airbag 4 and the second airbag 16 to correct the inner muscles, and interestingly controls the training movements by himself.

[0054] The fixed plate 1 is symmetrically provided with an elastic component on one side close to the pedal assembly for sensing the inversion or eversion of the patient's foot during rehabilitation training. One end of the elastic component is fixedly connected to the pedal assembly. The elastic component includes a reel and a base. The base is fixedly connected to the top of the fixed plate 1. The two ends of the reel are respectively rotatably connected to the inner wall of the fixed plate 1. The reel is fixedly connected with an elastic rope. The two ends of the elastic rope are respectively fixedly connected to the opposite side of the pedal assembly. The pedal assembly includes a foot pedal 15 and a rotating shaft 14. The foot pedal 15 is hinged on the rotating shaft 14. Both ends of the rotating shaft 14 are rotatably connected to a second slider 13 that slides with the guide rail 2. The ends of the guide rail 2 are fixedly connected A spring steel 12 is connected, and the end of the spring steel 12 away from the end of the guide rail 2 is fixedly connected to the second slider 13. During leg flexion training, the patient's leg muscles relax as they move from flexion to flatness, and the acceleration of the calf's fall increases under the action of gravity, causing the second slider 13 to move at a relatively high speed within the guide rail 2. This results in a transient impact force on the tibiofemoral joint surface, which can easily damage the fragile subchondral bone or prosthesis-bone interface microstructure after surgery. Therefore, when the leg muscles relax, the spring steel 12 exerts a reverse damping force on the second slider 13 through its nonlinear restoring force, reducing its speed within the guide rail 2 and effectively buffering joint impact. The elastic cord can be used to secure both sides of the patient's foot. Under normal conditions, the elastic cord can balance the patient's foot and provide resistance to enhance the training effect.

[0055] One end of the reel 36 is fixedly connected to a transmission rod 37, which passes through the side wall of the base 35 and is fixedly connected to a first connecting rod 38. The end of the first connecting rod 38 away from the transmission rod 37 is hinged to a second connecting rod 39. Permanent magnets are embedded in the first piston plate 25 and the second piston plate 19. The reset cylinder 11 is sleeved with a first magnetic ring 27 and a second magnetic ring 28 corresponding to the first piston plate 25 and the second piston plate 19. The outer walls of the first magnetic ring 27 and the second magnetic ring 28 are respectively hinged to the second connecting rod 39 on the same side. When the patient's foot turns inward at the same time as the leg during training (such as Figure 4 and Figure 5 As shown in the figure, the elastic rope 34 on the outside is stretched, and the first piston plate 25 moves while driving the first magnetic ring 27 to move at the same time through the permanent magnet adsorption. At this time, the second connecting rod 39 makes a reciprocating linear motion, driving the first connecting rod 38 to rotate while causing the transmission rod 37 to rotate axially. At this time, the reel 36 contracts in the reverse direction to tighten the elastic rope 34. The elastic rope 34 applies an outward pulling force to the patient's foot to correct the patient's foot to return to its original position, thereby synchronously correcting the force line of the lower limb.

[0056] Elastic straps are provided on both sides of the footrest 15, the thigh placement board 3 and the calf placement board 17, so that the patient can always maintain dynamic stability during the knee flexion exercise.

[0057] Example 2:

[0058] As attached Figure 1 and Figure 3 As shown, the difference from Example 1 is that the guide rails 2 are provided with adjustment components for adjusting the bending height between the thigh placement plate 3 and the calf placement plate 17, and the adjustment components include a limit block 32 fixedly connected to the guide rail 2, and a manual knob is provided on one side of the limit block 32. The manual knob is divided into three scales of 0-30°, 30°-60° and 60°-90°. According to the needs of the postoperative rehabilitation stage, such as early knee flexion limited to 0-30°, by rotating the manual knob 1 scale clockwise, a knob shaft 31 is fixedly connected to one side of the manual knob, the knob shaft 31 passes through the limit block 32 and is fixedly connected to a worm 30, a worm gear 29 is engaged with one side of the worm 30, the knob shaft 31 drives the worm 30 to rotate, the worm 30 is engaged with the worm gear 29, and the 30° rotation of the knob is converted into an 18° rotation of the worm gear 29, the worm gear 29 is coaxially fixedly connected to the screw rod 9, the worm gear 29 drives the coaxial screw rod 9 to rotate, and the screw rod 9 and the worm gear 29 are The internal thread connection of the wheel 29 forms a spiral pair. When the worm gear 29 and the worm 30 are meshed and rotated, the screw rod 9 does not rotate axially and only performs vertical lifting and lowering motion, converting the rotary motion into vertical displacement. The bottom end of the screw rod 9 passes through the fixed plate 1 and is rotatably connected to the bottom of the fixed plate 1. The top of the screw rod 9 is fixedly connected to the telescopic rod 8, and the top of the telescopic rod 8 is fixedly connected to the fixing ring 5. The telescopic rod 8 at the top of the screw rod 9 rotates and rises with the screw rod 9, and the fixing ring 5 is sleeved on the rotating rod 6. The fixing ring 5 changes the fulcrum position of the rotating rod 6 through the displacement of the telescopic rod 8, so that the bending angle of the thigh placement plate 3 and the calf placement plate 17 increases. A third spring 7 is sleeved on the telescopic rod 8, and the two ends of the third spring 7 are fixedly connected to the fixing ring 5 and the screw rod 9 respectively. Due to the inherent self-locking characteristics of the worm gear 30 transmission, it can ensure that the angle of the manual knob will not retract after adjustment. The patient can adjust it independently according to his own training needs, which increases the flexibility of training.

[0059] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A training device for postoperative rehabilitation of patients with knee arthritis, comprising a fixing plate (1), characterized in that: The fixing plate (1) is symmetrically provided with a leg-lifting assembly for placing the patient's legs and bending with the patient's movements; a slideway assembly for sliding the leg-lifting assembly is provided between the leg-lifting assembly and the fixing plate (1); and a pedal assembly for placing the patient's feet is symmetrically provided on the slideway assembly; Symmetrical airbag assemblies are provided on the inner sides of the leg-lifting assemblies. The airbag assemblies are used to sense the inversion or eversion of the patient's leg muscles during rehabilitation training. A symmetrically arranged reset assembly is also fixedly connected to the fixing plate (1). The airbag assemblies are respectively connected to both ends of the reset assembly. The reset assembly is used to push the airbag assembly to reset based on the sensing information of the airbag assembly to correct the patient's posture. Elastic assemblies are symmetrically provided on one side of the fixing plate (1) close to the pedal assembly for sensing the inversion or eversion of the patient's foot during rehabilitation training. One end of the elastic assembly is fixedly connected to the pedal assembly, and the other end of the elastic assembly is hinged to the reset assembly. The elastic components each include a reel (36) and a base (35), the base (35) being fixedly connected to the top of the fixed plate (1), the two ends of the reel (36) being rotatably connected to the inner side wall of the fixed plate (1), the reel (36) being fixedly connected to an elastic rope (34), the two ends of the elastic rope (34) being fixedly connected to opposite sides of the pedal component, one end of the reel (36) being fixedly connected to a transmission rod (37), the transmission rod (37) passing through the side wall of the base (35) and being fixedly connected to a first connecting rod (38), the end of the first connecting rod (38) away from the transmission rod (37) being hinged to a second connecting rod (39), the end of the second connecting rod (39) away from the first connecting rod (38) being hinged to the reset component.

2. The training device for postoperative rehabilitation of patients with knee arthritis according to claim 1, characterized in that: The leg-lifting assembly comprises a thigh placement plate (3) and a calf placement plate (17), a rotating rod (6) is hinged between the thigh placement plate (3) and the calf placement plate (17), and a first slider is hinged on the side of the calf placement plate (17) away from the rotating rod (6), and the first slider is slidably matched with the slide assembly.

3. The training device for postoperative rehabilitation of patients with knee arthritis according to claim 2, characterized in that: The slide assembly comprises a base plate fixedly connected to a fixed plate (1), symmetrically arranged guide rails (2) are fixedly connected to the base plate, and the first sliding blocks are respectively slidably fitted in the corresponding guide rails (2).

4. The training device for postoperative rehabilitation of patients with knee arthritis according to claim 3, characterized in that: The airbag assembly comprises a first airbag (4) symmetrically arranged in the thigh placement plate (3) and a second airbag (16) symmetrically arranged in the calf placement plate (17); the first airbag (4) and the second airbag (16) are both connected to the reset assembly.

5. The training device for postoperative rehabilitation of patients with knee arthritis according to claim 4, characterized in that: The reset assembly includes a reset cylinder (11), the reset cylinder (11) is fixedly connected to the fixed plate (1), and a first piston plate (25) and a second piston plate (19) are slidably connected in the reset cylinder (11). The first piston plate (25) and the second piston plate (19) separate the reset cylinder (11) into a first air cavity (26), a hydraulic cavity (24) and a second air cavity (18) from left to right. An air pipe (10) is connected between the ends of the first air cavity (26) and the second air cavity (18) away from the hydraulic cavity (24) and the first air bag (4) and the second air bag (16) on the same side. A hydraulic piston (23) is fixedly connected in the hydraulic cavity (24), a hydraulic hole (22) is opened on the hydraulic piston (23), a first piston rod and a second piston rod (21) are fixedly connected between the first piston plate (25) and the second piston plate (19) on both sides of the hydraulic piston (23), and a first spring and a second spring (20) are fixedly connected between the first piston plate (25) and the second piston plate (19) on both sides of the hydraulic piston (23), and the first spring and the second spring (20) are respectively sleeved on the first piston rod and the second piston rod (21).

6. The training device for postoperative rehabilitation of patients with knee arthritis according to claim 5, characterized in that: Permanent magnets are embedded in the first piston plate (25) and the second piston plate (19), and a first magnetic ring (27) and a second magnetic ring (28) corresponding to the first piston plate (25) and the second piston plate (19) are sleeved on the reset cylinder (11), and the outer side walls of the first magnetic ring (27) and the second magnetic ring (28) are respectively hinged to the second connecting rod located on the same side.

7. The training device for postoperative rehabilitation of patients with knee arthritis according to claim 6, characterized in that: The pedal assembly includes a foot pedal (15) and a rotating shaft (14). The foot pedal (15) is hinged on the rotating shaft (14). Both ends of the rotating shaft (14) are rotatably connected to a second slider (13) that slides with the guide rail (2). The end of the guide rail (2) is fixedly connected to a spring steel (12), and the end of the spring steel (12) away from the end of the guide rail (2) is fixedly connected to the second slider (13).

8. The training device for postoperative rehabilitation of patients with knee arthritis according to claim 7, characterized in that: The guide rail (2) is also symmetrically provided with an adjustment assembly for adjusting the bending height between the thigh placement plate (3) and the calf placement plate (17), and the adjustment assembly includes a limit block (32) fixedly connected to the guide rail (2), a manual knob is provided on one side of the limit block (32), and the manual knob is divided into a plurality of scales. A knob shaft (31) is fixedly connected to one side of the manual knob, and the knob shaft (31) passes through the limit block (32) and is fixedly connected to a worm (30), and one side of the worm (30) is engaged with the worm A worm wheel (29) is provided. The worm wheel (29) is coaxially fixedly connected to a screw rod (9). The bottom end of the screw rod (9) passes through a fixed plate (1) and is rotatably connected to the bottom of the fixed plate (1). The top end of the screw rod (9) is fixedly connected to a telescopic rod (8). The top end of the telescopic rod (8) is fixedly connected to a fixing ring (5). The fixing ring (5) is sleeved on a rotating rod (6). A third spring (7) is sleeved on the telescopic rod (8). The two ends of the third spring (7) are respectively fixedly connected to the fixing ring (5) and the screw rod (9).

9. The training device for postoperative rehabilitation of patients with knee arthritis according to claim 8, characterized in that: The inner sides of the thigh placement board (3) and the calf placement board (17) are both provided with sponge pads.

10. The training device for postoperative rehabilitation of patients with knee arthritis according to claim 9, characterized in that: Both sides of the footrest (15), the thigh placement board (3) and the calf placement board (17) are provided with elastic straps.

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