Knee joint postoperative rehabilitation training device and system

Abstract

The invention discloses a knee joint postoperative rehabilitation training device and system. The knee joint postoperative rehabilitation training device comprises a seat, a mounting frame, a limb supporting mechanism and a driving mechanism. The thighs and the shanks at the two ends of the knee joints are cushioned, restrained and fixed, and the shanks are driven to rotate and slide, so that the lower limbs are driven to bend and stretch the knee joints; active and passive training modes are switched through convenient switching operation; through a telescopic structure of the thigh placing groove plate and the shank placing groove plate, the device can be suitable for patients with different lower limb lengths to use, and the adaptability of the size structure is improved; the system is based on the knee joint rehabilitation training device, rapid reading, calculation and evaluation logic of the knee joint buckling angle is established, and the system comprises a data reading module, a data processing module, a data evaluation module and a guidance control module. And the training result in the training process is quickly evaluated so as to further guide the training operation.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical devices, and in particular relates to a device and system for rehabilitation training after knee surgery. Background Art

[0002] Knee replacement, also known as knee surface replacement, is a treatment method that replaces the joint surface damaged by disease with an artificial meniscus or artificial cartilage. This surgery is often used for severe knee joint diseases such as degenerative osteoarthritis of the knee, aiming to relieve knee pain, improve knee function, correct knee deformity, and achieve long-term stability.

[0003] The recovery time after knee replacement surgery varies from person to person, but generally speaking: partial knee replacement (single replacement) recovery is faster, usually 1 week to 1 month after surgery to return to normal. Traditional complete knee replacement surgery takes a long time to recover, usually 1-3 months, or even longer to return to normal. During the postoperative recovery period, patients need to undergo rehabilitation training under the guidance of a professional rehabilitation therapist to exercise the activity of the muscles around the knee joint and the coordination of the joints. At the same time, patients also need to keep the wound clean and dry, avoid infection, and have regular review and follow-up visits.

[0004] In conclusion, knee replacement is an effective method for treating severe knee joint lesions, but it needs to be performed on the basis of strict control of indications and contraindications. During the postoperative recovery period, patients need to undergo active rehabilitation training and care to promote the recovery of knee joint function and improve the quality of life.

[0005] Active and standardized rehabilitation training is required after knee replacement surgery. Rehabilitation training after knee replacement surgery is divided into early, middle and late stages. Among them, straight leg raising, active flexion and extension, passive flexion and extension, ankle pump exercise and other training movements of the lower limbs are common training movements, but according to the different stages of rehabilitation training, there are different intensity requirements and training standards.

[0006] Existing rehabilitation training after knee replacement surgery is usually performed by medical staff with professional nursing skills, who provide on-site guidance or teach patients and nursing staff to perform the above-mentioned rehabilitation training operations. Such operations usually have good results, but require real-time guidance from medical staff, which consumes medical resources and limits the venue of rehabilitation training, which can only be conducted in professional medical institutions. Moreover, it is impossible to intuitively quantify the effect of knee rehabilitation training and flexibly adjust the training intensity and active and passive training modes.

[0007] Therefore, it is necessary to provide a knee joint postoperative rehabilitation training device and system, the device can provide assistance for the patient's rehabilitation training, and the system can cooperate with the device to intuitively and intelligently guide the patient to perform rehabilitation training. Summary of the invention

[0008] In order to solve the above technical problems, the present invention provides a postoperative rehabilitation training device and system for knee joints, which can switch between active and passive rehabilitation training for patients through simple switching operations, and can intuitively guide and control the intelligent operation of the device when used in conjunction with the system; the device and the system are used in conjunction to assist patients in performing rehabilitation training operations and ankle pump exercises for flexion and extension of lower limbs;

[0009] In order to achieve the above technical objectives, the present invention is implemented by the following technical solutions:

[0010] One object of the present invention is to provide a postoperative rehabilitation training device for knee joints, comprising: a seat, a mounting frame, a limb support mechanism, and a driving mechanism;

[0011] The seat is a chair structure, including a bench and a backrest; the mounting frame is fixedly mounted on one end of the seat away from the backrest, and is composed of a plurality of parallel rods with horizontal axes; the other end of the mounting frame is fixedly connected to a mounting seat, and a distance sensor is mounted on the mounting seat;

[0012] The limb support mechanism comprises a calf placement slot plate, a thigh placement slot plate, a sliding seat A, a sliding seat B, and a foot pedal; the thigh placement slot plate is rotatably connected to the calf placement slot plate; the bottom of the thigh placement slot plate is rotatably connected to the sliding seat A, and the sliding seat A is slidably mounted on the mounting frame; the bottom of the calf placement slot plate is rotatably connected to the sliding seat B, and the sliding seat B is slidably mounted on the mounting frame;

[0013] The driving mechanism comprises a rotary driving member, a threaded rod, a threaded slider, a mounting groove, a connecting block B, and a control panel; a connecting block A is fixedly connected to the lower middle portion of the sliding seat B; the rotary driving member is fixedly mounted at one end below the mounting frame, and drives the threaded rod to generate a horizontal rotary motion along its axis; the threaded slider is spirally mounted on the threaded rod; the mounting groove is sleeved on the threaded slider and rotates around the axis of the threaded rod; the connecting block A is plugged into the mounting groove, and is fixedly connected to the mounting groove and the connecting block A at the upper and lower portions respectively by bolts;

[0014] A receiver is fixedly installed below the sliding seat B, and the receiver is adapted to the distance sensor to read the distance between the bottom end of the calf placement slot and the end of the mounting frame; the control panel records the distance between the top and bottom of the thigh placement slot, the distance between the top and bottom of the calf placement slot, and the distance between the bottom end of the calf placement slot and the end of the mounting frame, and controls the start and stop of the rotary drive member;

[0015] Furthermore, the thigh placement slot plate and the calf placement slot plate are both plates of a plug-in telescopic structure, and are limited by a spring pin or a latch after being extended and retracted; size scales are provided on the side end surfaces of the thigh placement slot plate and the calf placement slot plate, and the size scales indicate the lengths of the thigh placement slot plate and the calf placement slot plate; the top ends of the thigh placement slot plate and the calf placement slot plate are both provided with concave grooves;

[0016] Furthermore, the bottom end of the calf placement slot is rotatably connected to a foot pedal, a support rod is rotatably mounted on the back of the foot pedal, and the bottom end of the support rod is rotatably mounted on the sliding seat B; the support rod is a retractable rear-limited rod;

[0017] Furthermore, the thigh placement slot, the foot pedal, and the calf placement slot are all equipped with a plurality of restraint belts;

[0018] Further, the two ends of the mounting frame are respectively fixedly connected with a hanging ring A and a hanging ring B; the two sides of the bottom of the sliding seat B are respectively fixedly connected with a hanging ring C and a hanging ring D; the hanging ring C and the hanging ring D are respectively located on the two sides of the connecting block A; the hanging ring A, the hanging ring B, the hanging ring C, and the hanging ring D are all located at the same vertical height, and a stretching piece A is hung between the hanging ring A and the hanging ring C, and a stretching piece B is hung between the hanging ring B and the hanging ring D; the stretching piece A and the stretching piece B both include: a stretching spring, an elastic band, and a spring telescopic rod;

[0019] Another object of the present invention is to provide a postoperative rehabilitation training system for knee joints, which adopts the above-mentioned postoperative rehabilitation training device for knee joints and integrates the system functions into the control panel;

[0020] The system includes a data reading module, a data processing module, a data evaluation module, and a guidance control module;

[0021] The data reading module obtains the distance between the bottom end of the calf placement slot and the mounting seat through the distance sensor; obtains and inputs the length of the thigh placement slot and the calf placement plate after extension and contraction by reading the value of the size scale;

[0022] The data processing module obtains the required parameters through mathematical calculation and triangle congruence principle according to the data obtained by the data reading module;

[0023] The data evaluation module compares the angle and strength parameters obtained by the data processing module with the predetermined training standards, and obtains evaluation results of good, inadequate, and excellent according to the comparison results;

[0024] The guidance control module uses the evaluation result output by the data evaluation module to guide the next training operation;

[0025] Further, the parameters are length distance, angle α and force A, and elastic coefficient K of the stretching member; the angle α is the angle between the thigh placement slot and the calf placement slot; the length distance includes length distances X, Y, Z, W, U, and forces A, B, and C; the length distance X is the length of the thigh placement slot after extension and contraction indicated by the size scale; the length distance Y is the length of the calf placement slot after extension and contraction indicated by the size scale; the length distance Z is the distance between the bottom end of the calf placement slot and the mounting seat; the length distance W is the length of the mounting frame, that is, the distance between the seat and the mounting seat; the length distance U is the distance between the bottom end of the thigh placement slot and the bottom end of the calf placement slot; the elastic coefficient of the stretching member A is k1, and the elastic coefficient of the stretching member B is k2;

[0026] Furthermore, the data processing module obtains the lengths of three sides of a triangle formed by the thigh placement slot, the mounting frame, and the calf placement slot by calculation, namely, U, X, and Y, and U=WZ;

[0027] Further, the force A is the force that overcomes the elastic force of the stretching member B and pulls the sliding seat B toward the seat when the stretching member B is connected between the hanging ring D and the hanging ring B; the force B is the force that overcomes the elastic force of the stretching member A and moves the sliding seat B toward the mounting seat when the stretching member A is connected between the hanging ring A and the hanging ring C; A=k1*z; B=k2*U;

[0028] Further, the processing steps of the data processing module are as follows: if the angle α=90°, the correspondence is good; if the angle 0°<α<90°, the correspondence is restored; if the angle 90°<α<180°, the correspondence is insufficient;

[0029] Furthermore, the control steps of the guidance control module are: if the evaluation result is good, continue the same training; if the evaluation result is insufficient, continue to strengthen the training; if the evaluation result is recovery, stop the training.

[0030] The beneficial effects of the present invention are:

[0031] Compared with the traditional rehabilitation training operation of knee flexion and extension guided by medical staff and assisted by patients, the knee joint post-operative rehabilitation training device and system provided by the present invention respectively supports and fixes the limbs at both ends of the knee joint, and drives the lower limbs to perform flexion and extension movements through the sliding and rotation of the calf placement slot plate; the active training mode and the passive training mode can be flexibly and conveniently switched through mode switching; the telescopic structure of the thigh placement slot plate and the calf placement slot plate can be adapted to patients with different lower limb lengths for use, thereby improving the adaptability of the size structure;

[0032] Through the system, an evaluation system for the degree of knee flexion and the training effect is established, and the system is used to guide further training. The system and the device are closely linked and interdependent, and auxiliary training for rehabilitation training is performed intelligently. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0034] Figure 1 It is a front view of the present invention;

[0035] Figure 2 It is a schematic diagram of the overall structure of the present invention from one perspective;

[0036] Figure 3 is a schematic diagram of the overall structure of the seat, the mounting frame and the driving mechanism of the present invention;

[0037] Figure 4 The present invention Figure 1 A schematic diagram of the enlarged local structure at point A in the middle;

[0038] Figure 5 The present invention Figure 2 A magnified schematic diagram of the local structure at B in the middle;

[0039] Figure 6 The present invention Figure 3 A magnified schematic diagram of the local structure at C in the middle;

[0040] Figure 7 is an enlarged schematic diagram of the overall structure of the present invention from another viewing angle;

[0041] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0042] 1-seat, 101-stool, 102-backrest, 2-mounting frame, 201-mounting seat, 202-distance sensor, 203-hanging ring A, 204-hanging ring B, 3-limb support mechanism, 301-thigh placement slot, 302-calf placement slot, 303-sliding seat A, 304-sliding seat B, 305-foot pedal, 306-connecting block A, 307-receiver, 308-size scale, 309-groove, 3010-support rod, 3011-restraint belt, 4-driving mechanism, 401-rotation drive member, 402-threaded rod, 403-threaded slider, 404-mounting slot, 405-connecting block B, 406-control panel, 407-bolt, 408-hanging ring C, 409-hanging ring D. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] Example 1

[0045] See also Figure 1-Figure 7 In this embodiment, a knee joint postoperative rehabilitation training device includes: a seat 1, a mounting frame 2, a limb support mechanism 3, and a driving mechanism 4; the seat 1 is a component for the patient to sit on, and its structure can refer to an ordinary bench seat. The seat 1 is not the main design direction of the present invention. Figure 1 For demonstration purposes only, the seat 1 can be extended based on various types of seats in the prior art; the mounting frame 2 is a basic component for mounting the limb support mechanism 3 and the driving mechanism 4; the driving mechanism 4 is a component for driving the limb support mechanism 3 to function;

[0046] In this embodiment, the seat 1 is a chair structure, including a stool 101 and a backrest 102; the mounting frame 2 is fixedly mounted on one end of the seat 1 away from the backrest 102, and is composed of a plurality of parallel rods with horizontal axes; the other end of the mounting frame 2 is fixedly connected to a mounting seat 2, and a distance sensor 202 is mounted on the mounting seat 2; the distance sensor 202 is a mature technology in the prior art, and its function is to read the distance between two objects, specifically in the present invention, to read the distance between the bottom of the calf placement slot 302 and the mounting seat 201;

[0047] In this embodiment, the limb support mechanism 3 includes a calf placement slot plate 302, a thigh placement slot plate 301, a sliding seat A 303, a sliding seat B 304, and a foot pedal 305; the thigh placement slot plate 301 is rotatably connected to the calf placement slot plate 302; the bottom of the thigh placement slot plate 301 is rotatably connected to the sliding seat A 303, and the sliding seat A 303 is slidably installed on the mounting frame 2; the bottom of the calf placement slot plate 302 is rotatably connected to the sliding seat B 304, and the sliding seat B 304 is slidably installed on the mounting frame 2;

[0048] In this embodiment, the driving mechanism 4 includes a rotary driving member 401, a threaded rod 402, a threaded slider 403, a mounting groove 404, a connecting block B 405, and a control panel 406; a connecting block A 306 is fixedly connected to the lower middle part of the sliding seat B 304; the rotary driving member 401 is fixedly installed at one end below the mounting frame 2, and drives the threaded rod 402 to produce a horizontal rotary motion of the axis; the threaded slider 403 is spirally installed on the threaded rod 402; the mounting groove 404 is sleeved on the threaded slider 403, and rotates around the axis of the threaded rod 402; the connecting block A 306 is inserted into the mounting groove 404, and is fixedly connected to the mounting groove 404 and the connecting block B 405 at the bottom and top respectively by bolts 407;

[0049] In this embodiment, a receiver 307 is fixedly installed below the sliding seat B 304, and the receiver 307 is adapted to the distance sensor 202 to read the distance between the bottom end of the calf placement slot 302 and the end of the mounting frame 2; the control panel 406 records the distance between the top and bottom of the thigh placement slot 301, the distance between the top and bottom of the calf placement slot 302, and the distance between the bottom end of the calf placement slot 302 and the end of the mounting frame 2, and controls the start and stop of the rotary drive member 401;

[0050] In this embodiment, the thigh placement slot plate 301 and the calf placement slot plate 302 are both plates of plug-in telescopic structure, and are limited by spring pins or latches after being extended and retracted; the side end surfaces of the thigh placement slot plate 301 and the calf placement slot plate 302 are both provided with size scales 308, and the size scales 308 indicate the lengths of the thigh placement slot plate 301 and the calf placement slot plate 302; the top ends of the thigh placement slot plate and the top ends of the calf placement slot plate 302 are both provided with concave grooves 309;

[0051] In this embodiment, the bottom end of the calf placement slot 302 is rotatably connected to a foot pedal 305, and a support rod 3010 is rotatably mounted on the back of the foot pedal 305, and the bottom end of the support rod 3010 is rotatably mounted on the sliding seat B 304; the support rod 3010 is a retractable rear-limiting rod;

[0052] In this embodiment, a plurality of restraint belts 3011 are installed on the thigh placement groove plate 301, the foot pedal 305, and the calf placement groove plate 302; the restraint belts 3011 are essential components for the device to function, and their function is to make the user's thigh and calf move in conjunction with the thigh placement groove plate 301 and the calf placement groove plate 302 of the device respectively;

[0053] In this embodiment, the inner walls at both ends of the mounting seat 2A are respectively fixedly connected with a hanging ring A 203 and a hanging ring A 204; the bottom sides of the sliding seat B 304 are respectively fixedly connected with a hanging ring C 408 and a hanging ring C D 409; the hanging ring C and the hanging ring C D 409 are respectively located on both sides of the connecting block A 306; the hanging ring A 203, the hanging ring A 204, the hanging ring C 408, and the hanging ring D 409 are all located at the same vertical height, and the hanging ring A 203 and the hanging ring C 40 A stretching piece A is hung between the hanging ring 8, and a stretching piece B is hung between the hanging ring B 204 and the hanging ring D 409; the stretching piece A and the stretching piece B both include: a stretching spring, an elastic band, and a spring telescopic rod; the function of the stretching piece A and the stretching piece B is to provide resistance or power. Those skilled in the art should know that, based on its functionality, various types of components with telescopic functions in the field can be selected; when an active telescopic component is selected, power is provided for the patient's rehabilitation training, and the patient performs passive rehabilitation training. When a passive telescopic component is selected, the patient needs to overcome resistance to exercise, and the patient performs active rehabilitation training operations;

[0054] In this embodiment, the specific use process of a knee joint postoperative rehabilitation training device is as follows:

[0055] The device is mainly aimed at the flexion and extension training of the knee joint and the ankle pump exercise training of the ankle joint. According to the active and passive movement modes, the corresponding structures are switched and installed. Specifically: when passive training is required, the driving mechanism is used to insert the connecting block A into the mounting slot 404, and the connecting block B 405 and the connecting block A 306, and the connecting block B 405 and the mounting slot 404 are fastened by bolts 407; the calves and thighs on both sides of the patient's knees are placed in the calf placement slot plate 302 and the thigh placement slot plate 301 respectively, and the patient sits on the seat 1; the rotary driving member 401 is started and stopped by the control panel 406, and the rotary motion output by the rotary driving member 401 drives the threaded rod 402 to rotate, and the threaded rod 402 rotates to drive the threaded slider 403 to move horizontally, and the threaded slider 403 moves horizontally to drive the sliding seat B 304 to slide on the mounting seat 201, and at the same time, the thigh placement slot plate 301 and the calf placement slot plate 302 rotate relative to each other, so as to drive the patient's lower limbs to perform flexion and extension movements;

[0056] When active knee flexion and extension training is needed, the connection and linkage relationship between the driving mechanism 4 and the limb support mechanism 3 is released by removing the bolt 407; the stretching pieces are respectively hung on the hanging rings to provide resistance for the flexion and extension of the knee joint; the flexion and extension movement of the patient's knee joint needs to overcome the elastic potential energy stored in the stretching piece B and the stretching piece A respectively, and the patient performs active knee flexion and extension training;

[0057] Example 2

[0058] Please refer to Figure - Figure 7 Based on the above-mentioned embodiment 1, in this embodiment, a postoperative rehabilitation training device for knee joint is provided, wherein a foot pedal 305 is rotatably installed at the bottom end of the calf placement slot plate 302, and the foot pedal 305 is supported by the support rod 3010. Different forms of the support rod are selected according to the patient's usage requirements.

[0059] Specifically, if the foot pedal 305 is required to prevent foot drop, a telescopic rod that is telescopic and has a fixed length after being telescoped is selected as the support rod 3010, and the relative angle between the foot pedal 305 and the calf placement slot plate 302 is adjusted by adjusting the length of the support rod 3010, so that after the patient's foot steps on the foot pedal 305, the patient is in a hooked foot posture and does not suffer from foot drop symptoms;

[0060] When the knee joint is in dynamic flexion and extension training, a spring telescopic rod can be selected as the specific form of the support rod 3010. Since the spring telescopic rod has a certain elasticity, it has a supporting effect on the sole of the foot. The sole of the foot needs to overcome the elastic force of the spring telescopic rod to perform active ankle flexion and extension movements.

[0061] Example 3

[0062] See also Figure 1-Figure 7 In this embodiment, a knee joint postoperative rehabilitation training system is provided, which adopts a knee joint postoperative rehabilitation training device in the above-mentioned embodiment 1 and embodiment 2.

[0063] This system is designed to display the state of knee flexion and extension in real time and provide quantifiable specific values ​​to provide scientific guidance for patients to adjust their training intensity and training mode independently.

[0064] Specifically, in this embodiment, a postoperative rehabilitation training system for knee replacement is provided, which adopts the above-mentioned postoperative rehabilitation training device for knee replacement and integrates the system functions into the control panel;

[0065] In this embodiment, the system includes a data reading module, a data processing module, a data evaluation module, and a guidance control module;

[0066] In this embodiment, the data reading module obtains the distance between the bottom end of the calf placement slot and the mounting seat through the distance sensor; obtains and inputs the length of the thigh placement slot and the calf placement plate after extension and contraction by reading the value of the size scale;

[0067] In this embodiment, the data processing module obtains the required parameters through mathematical calculation and triangle congruence principle according to the data obtained by the data reading module;

[0068] In this embodiment, the data evaluation module compares the angle and strength parameters obtained by the data processing module with the predetermined training standards, and obtains the evaluation results of good, inadequate, and excellent according to the comparison results;

[0069] In this embodiment, the guidance control module uses the evaluation result output by the data evaluation module to guide the next training operation;

[0070] In this embodiment, the parameters are length distance, angle α and force A, and elastic coefficient K of the stretching member; the angle α is the angle between the thigh placement slot and the calf placement slot; the length distance includes length distances X, Y, Z, W, U, and forces A, B, and C; the length distance X is the length of the thigh placement slot after extension and contraction indicated by the size scale; the length distance Y is the length of the calf placement slot after extension and contraction indicated by the size scale; the length distance Z is the distance between the bottom end of the calf placement slot and the mounting seat; the length distance W is the length of the mounting frame, that is, the distance between the seat and the mounting seat; the length distance U is the distance between the bottom end of the thigh placement slot and the bottom end of the calf placement slot; the elastic coefficient of the stretching member A is k1, and the elastic coefficient of the stretching member B is k2;

[0071] In this embodiment, the data processing module calculates the lengths of the three sides of the triangle formed by the thigh placement slot, the mounting frame, and the calf placement slot, namely, U, X, and Y, and U=WZ;

[0072] In this embodiment, the force A is the force that overcomes the elastic force of the stretching member B and pulls the sliding seat B toward the seat when the stretching member B is connected between the hanging ring D and the hanging ring B; the force B is the force that overcomes the elastic force of the stretching member A and moves the sliding seat B toward the mounting seat when the stretching member A is connected between the hanging ring A and the hanging ring C; A=k1*z; B=k2*U;

[0073] In this embodiment, the processing steps of the data processing module are as follows: if the angle α=90°, the correspondence is good; if the angle is 0°<α<90°, the correspondence is restored; if the angle is 90°<α<180°, the correspondence is insufficient;

[0074] In this embodiment, the control steps of the guidance control module are: if the evaluation result is good, continue the same training; if the evaluation result is insufficient, continue to strengthen the training; if the evaluation result is recovery, stop the training.

[0075] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A postoperative rehabilitation training device for knee joint, characterized in that: include: Seats, mounting frames, limb support mechanisms, and drive mechanisms; The seat is a seat structure, including a stool and a backrest; The mounting frame is fixedly mounted on one end of the seat away from the backrest and is composed of a plurality of parallel rods with horizontal axes; the other end of the mounting frame is fixedly connected to a mounting seat, and distance sensors are fixedly mounted on both sides of the mounting seat; The limb support mechanism comprises a calf placement slot plate, a thigh placement slot plate, a sliding seat A, a sliding seat B, and a foot pedal; the thigh placement slot plate is rotatably connected to the calf placement slot plate; the bottom of the thigh placement slot plate is rotatably connected to the sliding seat A, and the sliding seat A is slidably mounted on the mounting frame; the bottom of the calf placement slot plate is rotatably connected to the sliding seat B, and the sliding seat B is slidably mounted on the mounting frame; The driving mechanism comprises a rotary driving member, a threaded rod, a threaded slider, a mounting groove, a connecting block B, and a control panel; a connecting block A is fixedly connected to the lower middle portion of the sliding seat B; the rotary driving member is fixedly mounted at one end below the mounting frame, and drives the threaded rod to generate a horizontal rotary motion along its axis; the threaded slider is spirally mounted on the threaded rod; the mounting groove is sleeved on the threaded slider and rotates around the axis of the threaded rod; the connecting block A is plugged into the mounting groove, and is fixedly connected to the mounting groove and the connecting block A at the upper and lower portions respectively by bolts; A receiver is fixedly installed below the sliding seat B, and the receiver is adapted to the distance sensor to read the distance between the bottom end of the calf placement slot and the end of the mounting frame; the control panel records the distance between the top and bottom ends of the thigh placement slot, the distance between the top and bottom ends of the calf placement slot, and the distance between the bottom end of the calf placement slot and the end of the mounting frame, and controls the start and stop of the rotary drive component.

2. A postoperative rehabilitation training device for knee joint according to claim 1, characterized in that: The thigh placement slot plate and the calf placement slot plate are both telescopic structure plates, and are limited by spring pins or latches after extension and retraction; size scales are provided on the side end surfaces of the thigh placement slot plate and the calf placement slot plate, and the size scales indicate the lengths of the thigh placement slot plate and the calf placement slot plate; the top ends of the thigh placement slot plate and the calf placement slot plate are both provided with concave grooves.

3. A postoperative rehabilitation training device for knee joint according to claim 1, characterized in that: The bottom end of the calf placement slot is rotatably connected to a foot pedal, a support rod is rotatably mounted on the back of the foot pedal, and the bottom end of the support rod is rotatably mounted on the sliding seat B; the support rod is a retractable rear-limiting rod.

4. A postoperative rehabilitation training device for knee joint according to claim 1, characterized in that: The thigh placement groove plate, the foot pedal, and the calf placement groove plate are all equipped with a plurality of restraint belts.

5. The postoperative rehabilitation training device for knee joint according to claim 1, characterized in that: The inner walls at both ends of the mounting seat A are respectively fixedly connected with a hanging ring A and a hanging ring B; the two sides of the bottom of the sliding seat B are respectively fixedly connected with a hanging ring C and a hanging ring D; the hanging ring C and the hanging ring D are respectively located on both sides of the connecting block A; the hanging ring A, the hanging ring B, the hanging ring C, and the hanging ring D are all located at the same vertical height, and a stretching piece A is hung between the hanging ring A and the hanging ring C, and a stretching piece B is hung between the hanging ring B and the hanging ring D; the stretching piece A and the stretching piece B both include: a stretching spring, an elastic band, and a spring telescopic rod.

6. A postoperative rehabilitation training system for knee joints, characterized in that: A knee joint postoperative rehabilitation training device as claimed in any one of claims 1 to 5 is used, and the system function is integrated into the control panel; the system includes a data reading module, a data processing module, a data evaluation module, and a guidance control module; The data reading module obtains the distance between the bottom end of the calf placement slot and the mounting seat through the distance sensor; obtains and inputs the length of the thigh placement slot and the calf placement plate after extension and contraction by reading the value of the size scale; The data processing module obtains the required parameters through mathematical calculation and triangle congruence principle according to the data obtained by the data reading module; The data evaluation module compares the angle and strength parameters obtained by the data processing module with the predetermined training standards, and obtains evaluation results of good, inadequate, and excellent according to the comparison results; The guidance control module uses the evaluation result output by the data evaluation module to guide the next training operation.

7. A postoperative knee joint rehabilitation training system according to claim 6, characterized in that: The parameters are length distance, angle α and force A, force B, and elastic coefficient K of the stretching piece; the angle α is the angle between the thigh placement slot and the calf placement slot; the length distance includes length distances X, Y, Z, W, and U; the length distance X is the length of the thigh placement slot after extension and contraction indicated by the size scale; the length distance Y is the length of the calf placement slot after extension and contraction indicated by the size scale; the length distance Z is the distance between the bottom end of the calf placement slot and the mounting seat; the length distance W is the length of the mounting frame, that is, the distance between the seat and the mounting seat; the length distance U is the distance between the bottom end of the thigh placement slot and the bottom end of the calf placement slot; the elastic coefficient of the stretching piece A is k1, and the elastic coefficient of the stretching piece B is k2.

8. A postoperative knee joint rehabilitation training system according to claim 6, characterized in that: The data processing module obtains the lengths of the three sides of the triangle formed by the thigh placement slot, the mounting frame, and the calf placement slot by calculation, namely, U, X, and Y, and U=WZ.

9. A postoperative knee joint rehabilitation training system according to claim 6, characterized in that: The force A is the force that overcomes the elastic force of the stretching member B and pulls the sliding seat B toward the seat when the stretching member B is connected between the hanging ring D and the hanging ring B; the force B is the force that overcomes the elastic force of the stretching member A and moves the sliding seat B toward the mounting seat when the stretching member A is connected between the hanging ring A and the hanging ring C; A=k1*z; B=k2*U.

10. A postoperative knee joint rehabilitation training system according to claim 6, characterized in that: The processing steps of the data processing module are as follows: if the angle α=90°, it corresponds to good; if the angle 0°<α<90°, it corresponds to recovery; if the angle 90°<α<180°, it corresponds to insufficiency; the control steps of the guidance control module are: if the evaluation result is good, continue the same training; if the evaluation result is insufficiency, continue to strengthen the training; if the evaluation result is recovery, stop the training.

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