Lower limb knee joint passive flexion training device and training method for hemiplegic patients

Abstract

The present invention discloses a passive flexion training device and training method for the lower limb knee joints of hemiplegic patients. A passive flexion training device and training method for the knee joints of the patient is disclosed. The device and training method are capable of automatically lifting the patient's lower limbs by inflating a lifting cylinder to slowly raise a lower limb lifting rod. The device can lift the patient's lower limbs back and forth multiple times, reducing the burden on the nurse, and the device can automatically lift the knee joints to the right position each time the lifting is performed, thereby improving the training effect. The device is characterized in that it includes a lifting cylinder, a lower limb lifting rod, and a lower limb lifting assembly. The device is characterized in that the lower limb lifting rod is slidably arranged in the lifting cylinder, the lower limb lifting assembly is arranged on the lower limb lifting rod, and is used to lift the patient's calf. The gas filled in the lifting cylinder lifts the lower limb lifting rod, and the lower limb lifting rod slowly rises under the lifting action of the gas, and the patient's calf is driven to flex through the lower limb lifting assembly to perform passive knee joint training.

Description

Technical Field

[0001] The present invention relates to a lower limb knee joint passive flexion training device and training method for hemiplegic patients, which relate to a training device that assists hemiplegic patients in passively flexing their knee joints when performing lower limb training. The invention belongs to the technical field of medical devices, and particularly relates to a training device and training method that can automatically lift the patient's lower limbs for knee flexion training, reduce the burden on nurses, and improve training effects. Background Art

[0002] Hemiplegia is the most common functional disability in stroke patients. It refers to paralysis of the upper and lower limbs on the same side, caused by damage to the unilateral vertebral tract and often accompanied by extrapyramidal damage. Lower limb motor dysfunction is one of the main problems in hemiplegic stroke patients. Symptoms such as lower limb muscle weakness and muscle spasms often make it difficult to move the lower limb joints. Therefore, how to effectively carry out rehabilitation training to promote muscle recovery and lower limb joint mobility has become a major issue. Currently, passive knee flexion training for hemiplegic patients is an important means to restore lower limb motor ability. This method generally requires the patient to lie flat on a training bed. The nurse slowly lifts the patient's lower leg until the leg is flexed and the angle between the knee joint and the thigh is between 85 and 95 degrees. The nurse then removes the patient's hand from the patient's leg and allows the patient to slowly return the leg to its original position independently, allowing the patient to gradually restore the ability to control the joint movement angle and muscle movement ability. However, this training method requires multiple lifting of the patient's lower leg, which is a heavy burden on the nurse. In the later stages of training, the patient's knee joint is often not flexed properly due to insufficient hand strength, which reduces the effectiveness of the lower limb training. Summary of the Invention

[0003] To improve this situation, the present invention provides a passive knee flexion training device and method for hemiplegic patients. This device and method automatically elevates the patient's lower limbs by inflating a lifting cylinder and slowly raising a lower limb lifting rod. This device can lift the patient's lower limbs back and forth multiple times, reducing the burden on the nurse. The automatic lifting ensures that the knee joint is fully flexed each time it is lifted, improving the training effect.

[0004] The present invention provides a lower limb knee joint passive flexion training device for hemiplegic patients. The present invention provides a lower limb knee joint passive flexion training device for hemiplegic patients, comprising a lifting air cylinder, a lower limb lifting rod and a lower limb lifting assembly.

[0005] The invention is characterized in that the lower limb lifting rod is slidably arranged in the lifting cylinder, the lower limb lifting assembly is arranged on the lower limb lifting rod, and is used to lift the patient's calf. The gas filled in the lifting cylinder lifts the lower limb lifting rod, and the lower limb lifting rod slowly rises under the lifting effect of the gas, and the lower limb lifting assembly drives the patient's calf to flex and perform passive knee joint training.

[0006] The lifting cylinder is placed on a circular base.

[0007] Preferably, the cross-sectional diameter of the circular base gradually decreases from one end to the other.

[0008] Preferably, one end of the lifting cylinder connected to the circular base is a closed structure, and the other end of the lifting cylinder is an open structure.

[0009] The other end of the lifting cylinder is provided with an upper limit plate.

[0010] Preferably, the upper limit plate is an annular structure.

[0011] The side wall of the lifting cylinder is provided with an air outlet.

[0012] Preferably, the air outlet is close to the other end of the lifting cylinder and is located below the upper limit plate. There are multiple air outlets, and the multiple air outlets are arranged equidistantly along the circumference of the lifting cylinder.

[0013] Preferably, the inner wall of the lifting cylinder is smooth.

[0014] A lower limit plate is provided in the lifting cylinder.

[0015] Preferably, the lower limit plate is an annular structure, and the lower limit plate is close to one end of the lifting cylinder.

[0016] The lifting cylinder is provided with an inflation tube, and the inflation tube is connected to the lifting cylinder.

[0017] Preferably, the inflation tube is close to one end of the lifting cylinder and is located below the lower limit plate.

[0018] Preferably, one end of the inflation tube extends upward at an acute angle to the lifting cylinder for a distance, and then extends horizontally to the other end.

[0019] Preferably, the inflation pipe is connected to the inflation pump via a connecting hose.

[0020] One end of the lower limb lifting rod is slidably placed in the lifting cylinder, and the other end passes through the upper limit plate and extends to the outside of the lifting cylinder.

[0021] Preferably, the lower limb lifting rod is in contact with the side wall of the upper limit plate.

[0022] A lifting piston is provided at one end of the lower limb lifting rod.

[0023] Preferably, the lifting piston is slidably placed in the lifting cylinder, the lifting piston is a cylindrical structure, and the side wall of the lifting piston is in contact with the inner wall of the lifting cylinder.

[0024] Preferably, the side wall of the lifting piston is provided with a shallow gas-guiding thread groove.

[0025] Preferably, the height of the lifting piston is smaller than the distance from the upper limit plate to the air outlet.

[0026] The lower limb lifting assembly consists of a U-shaped lower limb tray, a hinge shaft and a tray support rod.

[0027] One end of the tray support rod is connected to the other end of the lower limb lifting rod through a hinge shaft, and the other end of the tray support rod is provided with a U-shaped lower limb tray.

[0028] Preferably, the bottom plate of the U-shaped lower limb tray is an arc-shaped structure, and the middle portion of the U-shaped lower limb tray is connected to the other end of the tray support rod;

[0029] Preferably, a pressure sensor is provided on the bottom plate of the U-shaped lower limb tray.

[0030] Preferably, a distance sensor is provided at the other end of the lower limb lifting rod.

[0031] Preferably, a signal converter is provided in the circular base, a data processor is provided in the circular base, and a controller is provided in the circular base.

[0032] Preferably, the pressure sensor and the signal converter are connected via a power line, the distance sensor and the signal converter are connected via a power line, the signal converter and the data processor are connected via a power line, the data processor and the controller are connected via a power line, and the controller and the air pump are connected via a power line;

[0033] Furthermore, the U-shaped lower limb tray is replaced by a W-shaped lower limb tray, the W-shaped lower limb tray is placed at the other end of the tray support rod, the bottom plate of the W-shaped lower limb tray is continuously bent into a W shape, a pressure sensor is provided on the bottom plate of the W-shaped lower limb tray, and a distance sensor is provided on the side plate of the W-shaped lower limb tray;

[0034] Furthermore, a sponge cushion is provided on the bottom plate of the U-shaped lower limb tray, the width of the sponge cushion is greater than the width of the bottom plate of the U-shaped lower limb tray, the sponge cushion is an arc-shaped structure, and the thickness of the sponge cushion gradually decreases from the middle to the two ends;

[0035] Furthermore, the bottom plate of the U-shaped lower limb tray is provided with multiple rows of ventilation holes, and the multiple rows of ventilation holes are arranged equidistantly along the length direction of the bottom plate of the U-shaped lower limb tray. There are multiple ventilation holes in a row, and the multiple ventilation holes are arranged equidistantly along the width direction of the bottom plate of the U-shaped lower limb tray.

[0036] The present invention also relates to a method for passive flexion training of the lower limb knee joints of hemiplegic patients, which is characterized by using a passive flexion training device for the lower limb knee joints of hemiplegic patients to automatically perform lifting and flexion training on the patient's lower limbs, specifically comprising the following steps:

[0037] (1) The patient lies prone on the training bed, and the flexion training device is placed at the end of the bed so that the patient's calf can be placed flat in the U-shaped lower limb tray;

[0038] (2) Start the air pump, fill the lifting cylinder with high-pressure gas, lift the lifting piston, and slowly raise the lower limb lifting rod. Push the patient's lower leg to flex through the U-shaped lower limb tray, so that the patient's knee joint is passively flexed between 85 degrees and 95 degrees.

[0039] (3) The lifting piston continues to rise and reaches the space above the air outlet. High-pressure gas escapes from the air outlet. The gas strength in the lifting cylinder is insufficient. The lifting piston slides back to the lower limit plate under the action of gravity, and the U-shaped lower limb tray is separated from the patient's calf.

[0040] Preferably, during the process of the lifting piston rising and falling, the distance sensor continuously obtains the distance between itself and the circular base—the distance is maximum when the lifting piston rises to the highest point, and the distance is minimum when the lifting piston falls back to the lower limit plate, and at the same time transmits the distance signal to the signal converter, which converts the distance signal into a distance number and transmits it to the data processor;

[0041] Preferably, when the patient's calf is placed on the U-shaped lower limb tray, the pressure sensor senses the pressure and transmits the pressure signal to the signal converter, which converts the pressure signal into a pressure number and transmits it to the data processor;

[0042] Preferably, the data processor processes the pressure data and the distance data: when the lifting piston rises to the highest point, that is, the distance number is the largest, the data processor sends an instruction to the controller, and the controller controls the inflation pump to stop inflation;

[0043] When the lifting piston falls back to the lower limit plate, that is, when the distance number is the smallest, if the pressure data is 0 or very small, it means that the patient's calf is not placed on the U-shaped lower limb tray, and the data processor sends an instruction to the controller, and the inflation pump remains in the stopped state; if the pressure data is within the set threshold range, it means that the patient's calf is placed on the U-shaped lower limb tray, and the data processor sends an instruction to the controller, and the controller controls the inflation pump to start and fill the lifting cylinder with high-pressure gas;

[0044] (4) After the U-shaped lower limb tray is separated from the patient's calf, the patient maintains the knee flexion position for a certain period of time, and then slowly extends the lower limb. During this period, the patient can keep the lower limb at a certain point of joint movement, training the patient to master the control ability at each joint movement angle;

[0045] (5) When the patient's lower limbs are fully extended, the patient's calves fall back onto the U-shaped lower limb tray. The air pump inflates the lifting cylinder according to the rules in step (3), and lifts the patient's lower limbs back and forth several times to perform knee flexion training. Beneficial effects

[0046] 1. It can automatically lift the patient's lower limbs and help the patient perform passive knee flexion training.

[0047] 2. It can lift the patient's lower limbs back and forth multiple times to perform knee joint training, reducing the burden on nurses.

[0048] 3. Automatic lifting can make the knee joint flex into place each time it is lifted, thus improving the training effect.

[0049] 4. Simple structure and easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 This is a three-dimensional structural diagram of a lower limb knee joint passive flexion training device for hemiplegic patients according to the present invention;

[0051] Figure 2 This is a schematic structural diagram of a lower limb knee joint passive flexion training device for hemiplegic patients according to the present invention;

[0052] Figure 3 This is a schematic structural diagram of a lower limb knee joint passive flexion training device for hemiplegic patients of the present invention, which only shows the structure of the tray support rod;

[0053] Figure 4 This is a three-dimensional structural diagram of Example 2 of a lower limb knee joint passive flexion training device for hemiplegic patients of the present invention;

[0054] Figure 5 This is a three-dimensional structural diagram of Example 3 of a lower limb knee joint passive flexion training device for hemiplegic patients of the present invention;

[0055] Figure 6 This is a three-dimensional structural diagram of Example 4 of a lower limb knee joint passive flexion training device for hemiplegic patients of the present invention.

[0056] Attached photos

[0057] The components include: a U-shaped lower limb tray (1), a lower limb lifting rod (2), an upper limit plate (3), an air outlet (4), a lifting air cylinder (5), an inflation tube (6), a circular base (7), a hinge shaft (8), a tray support rod (9), a lifting piston (10), a lower limit plate (11), a W-shaped lower limb tray (12), a sponge cushion (13), and an air vent (14). DETAILED DESCRIPTION Example 1

[0058] The present invention provides a lower limb knee joint passive flexion training device for hemiplegic patients, comprising a lifting air cylinder (5), a lower limb lifting rod (2) and a lower limb lifting assembly.

[0059] The invention is characterized in that the lower limb lifting rod (2) is slidably arranged in the lifting cylinder (5), the lower limb lifting assembly is arranged on the lower limb lifting rod (2), and is used to lift the patient's calf. The gas filled in the lifting cylinder (5) lifts the lower limb lifting rod (2), and the lower limb lifting rod (2) slowly rises under the lifting action of the gas, and the lower limb lifting assembly drives the patient's calf to flex and perform passive knee joint training.

[0060] The lifting cylinder (5) is placed on a circular base (7).

[0061] Preferably, the cross-sectional diameter of the circular base (7) gradually decreases from one end to the other end.

[0062] Preferably, a pressure plate capable of placing heavy objects is provided on the edge of the circular base (7), and the stability of the circular base (7) can be increased by placing small but heavy objects on the pressure plate;

[0063] Preferably, one end of the lifting cylinder (5) connected to the circular base (7) is a closed structure, and the other end of the lifting cylinder (5) is an open structure.

[0064] The other end of the lifting cylinder (5) is provided with an upper limit plate (3).

[0065] Preferably, the upper limit plate (3) is an annular structure.

[0066] The side wall of the lifting cylinder (5) is provided with an air outlet hole (4).

[0067] Preferably, the air outlet hole (4) is close to the other end of the lifting cylinder (5) and is located below the upper limit plate (3). There are multiple air outlet holes (4), and the multiple air outlet holes (4) are arranged at equal distances along the circumference of the lifting cylinder (5).

[0068] Preferably, the air outlet (4) can be one or a combination of circular, elliptical, triangular, quadrilateral, pentagonal, hexagonal, and rhombus shapes.

[0069] Preferably, the inner wall of the lifting cylinder (5) is smooth.

[0070] A lower limit plate (11) is provided in the lifting cylinder (5).

[0071] Preferably, the lower limit plate (11) is an annular structure, and the lower limit plate (11) is close to one end of the lifting cylinder (5).

[0072] The lifting cylinder (5) is provided with an inflation tube (6), and the inflation tube (6) is connected to the lifting cylinder (5).

[0073] Preferably, the inflation tube (6) is close to one end of the lifting cylinder (5) and is located below the lower limit plate (11).

[0074] Preferably, one end of the inflation tube (6) and the lifting cylinder (5) extend upward at an acute angle for a distance and then extend horizontally to the other end.

[0075] Preferably, the inflation pipe (6) is connected to the inflation pump via a connecting hose.

[0076] One end of the lower limb lifting rod (2) is slidably placed in the lifting cylinder (5), and the other end passes through the upper limit plate (3) and extends to the outside of the lifting cylinder (5).

[0077] Preferably, the lower limb lifting rod (2) can be a telescopic rod, which can adapt to people with different lower limb lengths and has a wide range of uses;

[0078] Preferably, the lower limb lifting rod (2) is in contact with the side wall of the upper limit plate (3).

[0079] A lifting piston (10) is provided at one end of the lower limb lifting rod (2).

[0080] Preferably, the lifting piston (10) is slidably placed in the lifting cylinder (5), the lifting piston (10) is a cylindrical structure, and the side wall of the lifting piston (10) is in contact with the inner wall of the lifting cylinder (5).

[0081] Preferably, the side wall of the lifting piston (10) is provided with a shallow gas-guiding thread groove.

[0082] Preferably, the height of the lifting piston (10) is smaller than the distance from the upper limit plate (3) to the air outlet (4).

[0083] The lower limb lifting assembly is composed of a U-shaped lower limb tray (1), a hinge shaft (8) and a tray support rod (9).

[0084] One end of the tray support rod (9) is rotatably connected to the other end of the lower limb lifting rod (2) via a hinge shaft (8), and a U-shaped lower limb tray (1) is provided at the other end of the tray support rod (9).

[0085] Preferably, a torsion spring is provided at the connection portion between the tray support rod (9) and the other end of the lower limb lifting rod (2), so as to enable the tilted U-shaped lower limb tray (1) to return to its original position after pushing the patient's knee joint to flex, thereby facilitating the placement of the patient's calf during multiple back-and-forth training;

[0086] Preferably, the bottom plate of the U-shaped lower limb tray (1) is an arc-shaped structure, and the middle portion of the U-shaped lower limb tray (1) is connected to the other end of the tray support rod (9);

[0087] Preferably, a pressure sensor is provided on the bottom plate of the U-shaped lower limb tray (1).

[0088] Preferably, a distance sensor is provided at the other end of the lower limb lifting rod (2).

[0089] Preferably, a signal converter is provided in the circular base (7), a data processor is provided in the circular base (7), and a controller is provided in the circular base (7).

[0090] Preferably, the pressure sensor and the signal converter are connected via a power line, the distance sensor and the signal converter are connected via a power line, the signal converter and the data processor are connected via a power line, the data processor and the controller are connected via a power line, and the controller and the air pump are connected via a power line;

[0091] The present invention provides a method for passive flexion training of the lower limb knee joints for hemiplegic patients, which is characterized by using a passive flexion training device for the lower limb knee joints of hemiplegic patients to perform automatic lifting and flexion training on the patient's lower limbs, specifically comprising the following steps:

[0092] (1) The patient lies prone on the training bed, and the flexion training device is placed at the end of the bed so that the patient's calf can be placed flat in the U-shaped lower limb tray (1);

[0093] Preferably, the patient's lower legs extend out of the training bed;

[0094] (2) Start the air pump, fill the lifting cylinder (5) with high-pressure gas, and lift the lifting piston (10), so that the lower limb lifting rod (2) rises slowly, and pushes the patient's lower leg to flex through the U-shaped lower limb tray (1), so that the patient's knee joint is passively flexed between 85 degrees and 95 degrees;

[0095] Preferably, the patient's knee joint passive flexion angle is preferably 90 degrees;

[0096] (3) The lifting piston (10) continues to rise and reaches the space above the air outlet (4), and the high-pressure gas escapes from the air outlet (4). The gas strength in the lifting cylinder (5) is insufficient, and the lifting piston (10) slides back onto the lower limit plate (11) under the action of gravity, and the U-shaped lower limb tray (1) is separated from the patient's calf;

[0097] Preferably, during the process of the lifting piston (10) rising and falling, the distance sensor continuously obtains the distance between itself and the circular base (7) - the distance is the largest when the lifting piston (10) rises to the highest point, and the distance is the smallest when the lifting piston (10) falls back to the lower limit plate (11), and at the same time transmits the distance signal to the signal converter, which converts the distance signal into a distance number and transmits it to the data processor;

[0098] Preferably, when the patient's calf is placed on the U-shaped lower limb tray (1), the pressure sensor senses the pressure and transmits the pressure signal to the signal converter, which converts the pressure signal into a pressure number and transmits it to the data processor;

[0099] Preferably, the data processor processes the pressure data and the distance data: when the lifting piston (10) rises to the highest point, that is, when the distance number is the largest, the data processor sends an instruction to the controller, and the controller controls the inflation pump to stop inflation;

[0100] When the lifting piston (10) falls back onto the lower limit plate (11), that is, when the distance number is the smallest, if the pressure data is 0 or very small, it means that the patient's calf is not placed on the U-shaped lower limb tray (1), and the data processor sends an instruction to the controller, and the inflation pump remains in a stopped state; if the pressure data is within the set threshold range, it means that the patient's calf is placed on the U-shaped lower limb tray (1), and the data processor sends an instruction to the controller, and the controller controls the inflation pump to start and fill the lifting cylinder (5) with high-pressure gas;

[0101] (4) After the U-shaped lower limb tray (1) is separated from the patient's calf, the patient maintains the knee flexion position for a certain period of time, and then slowly extends the lower limb. During this period, the patient can keep the lower limb at a certain point of joint movement, training the patient to master the control ability at each joint movement angle;

[0102] Preferably, the patient can select any one or more angles of the knee joint between 90 degrees and 180 degrees as the holding point;

[0103] (5) When the patient's lower limbs are fully extended, the patient's calves fall back onto the U-shaped lower limb tray (1), and the air pump inflates the lifting cylinder (5) according to the rules in step (3), and lifts the patient's lower limbs back and forth several times to perform knee flexion training. Example 2

[0104] The difference between this embodiment and embodiment 1 is that: the U-shaped lower limb tray (1) is replaced by a W-shaped lower limb tray (12), the W-shaped lower limb tray (12) is placed at the other end of the tray support rod (9), the bottom plate of the W-shaped lower limb tray (12) is continuously curved into a W shape, a pressure sensor is provided on the bottom plate of the W-shaped lower limb tray (12), and a distance sensor is provided on the side plate of the W-shaped lower limb tray (12); when in use, the patient can adjust the position of the calf of the left or right leg in the W-shaped lower limb tray (12) according to the hemiplegia condition, so as to avoid the patient's knee joint being adducted or abducted during flexion training; Example 3

[0105] The difference between this embodiment and embodiment 1 is that: a sponge cushion (13) is provided on the bottom plate of the U-shaped lower limb tray (1), the width of the sponge cushion (13) is greater than the width of the bottom plate of the U-shaped lower limb tray, the sponge cushion (13) is an arc-shaped structure, and the thickness of the sponge cushion (13) gradually decreases from the middle to the two ends; when in use, the sponge cushion (13) can enable flexible contact between the patient's calf and the U-shaped lower limb tray (1), thereby avoiding the patient's lower limbs from being injured by repeatedly pushing the patient's legs back and forth against the edge of the U-shaped lower limb tray (1), thereby improving the patient's comfort during knee flexion training; Example 4

[0106] The difference between this embodiment and embodiment 1 is that: the bottom plate of the U-shaped lower limb tray (1) is provided with a plurality of rows of ventilation holes (14), and the plurality of rows of ventilation holes (14) are arranged equidistantly along the length direction of the bottom plate of the U-shaped lower limb tray (1), and a row of ventilation holes (14) has a plurality of ventilation holes, and the plurality of ventilation holes (14) are arranged equidistantly along the width direction of the bottom plate of the U-shaped lower limb tray (1); when in use, the ventilation holes (14) can play a role in ventilation and perspiration removal, and can discharge the sweat generated by the patient performing knee flexion training back and forth multiple times, thereby improving the comfort of training;

[0107] The upper limit plate (3) cooperates with the lower limit plate (11) to limit the lifting piston (10), which can prevent the lifting piston (10) from extending out of the lifting cylinder (5) during the lifting process and sliding below the inflation tube (6) during the falling process, thereby preventing the patient's lower leg from being lifted back and forth continuously for multiple times, thereby affecting the flexion training of the patient's knee joint;

[0108] The design of the inflation tube (6) cooperating with the lower limit plate (11) so that the lifting piston (10) is always above the inflation tube (6) enables the high-pressure gas entering the lifting cylinder (5) through the inflation tube (6) to push the lifting piston (10) multiple times, thereby lifting the patient's lower limbs back and forth multiple times to perform knee joint training, thereby reducing the burden on the nurse.

[0109] The tray support rod (9) is designed to be rotatably connected with the lower limb lifting rod (2), so that the U-shaped lower limb tray (1) can tilt accordingly with the change of the patient's knee joint angle during the process of supporting the patient's calf, so that it always fits the patient's calf, thereby improving the support stability of the patient's lower limb during the patient's knee joint flexion training;

[0110] The design is that one end of the inflation tube (6) and the lifting cylinder (5) extend upward at an acute angle for a distance and then extend horizontally to the other end. The other end of the inflation tube (6) is horizontal, which can be easily connected to the inflation pump. The other end is set obliquely, so that the high-pressure gas entering the lifting cylinder (5) through the inflation tube (6) will not directly impact the lifting piston (10), thereby preventing the lifting piston (10) from being subjected to a large direct impact force and rising rapidly, causing damage to the patient's lower limb knee joint;

[0111] The smooth inner wall design of the lifting cylinder (5) can reduce the friction between the lifting piston (10), making it easier for the lifting piston (10) to rise or fall in the lifting cylinder (5), thereby facilitating flexion training of the patient's knee joint;

[0112] The lifting piston (10) is designed with a shallow gas-guiding thread groove on the side wall, which enables a small amount of high-pressure gas filled in the lifting cylinder (5) to escape through the shallow gas-guiding thread groove, thereby reducing the pressure of the high-pressure gas and preventing the lifting piston (10) from rising too quickly under the impact of the high-pressure gas. At the same time, when the lifting piston (10) falls back, the gas remaining in the lifting cylinder (5) can be discharged through the shallow gas-guiding thread groove, thereby preventing the residual gas from forming compressed air in the lifting cylinder (5) and affecting the falling back of the lifting piston (10);

[0113] The height of the lifting piston (10) is designed to be less than the distance from the upper limit plate (3) to the air outlet (4), so that the lifting piston (10) can rise above the air outlet (4), leaving enough space for the high-pressure gas to escape from the air outlet (4), making it easier to lift the patient's lower limbs back and forth multiple times to perform knee flexion training;

[0114] The purpose is to automatically lift the patient's lower limbs back and forth multiple times to perform passive knee flexion training, reduce the burden on nurses, and enable the knee joint to be flexed in place each time it is lifted, thereby improving the training effect.

[0115] It should be noted that, unless otherwise expressly specified or limited, the terms "placed in," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections such as hemming, rivet connection, pin connection, adhesive connection, and welding connection; detachable connections such as threaded connection, snap connection, and hinge connection; or integral connection; electrical connection; direct connection; indirect connection through an intermediate medium; or 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 specific circumstances.

[0116] It should be further pointed out that, when describing the above specific embodiments, for the sake of simplicity and clarity, only the differences between them and other embodiments are described, but those skilled in the art should know that the above specific embodiments.

Claims

1. A lower limb knee joint passive flexion training device for hemiplegic patients, comprising a lifting cylinder, a lower limb lifting rod, and a lower limb lifting assembly, characterized in that: The lower limb lifting rod is slidably arranged in the lifting cylinder, and the lower limb lifting assembly is arranged on the lower limb lifting rod for lifting the patient's calf. The gas filled in the lifting cylinder lifts the lower limb lifting rod, and the lower limb lifting rod slowly rises under the lifting action of the gas, and the patient's lower leg is driven to flex through the lower limb lifting assembly to perform passive knee joint training. The lifting cylinder is placed on a circular base, and the cross-sectional diameter of the circular base gradually decreases from one end to the other end. The end at which the lifting cylinder and the circular base are connected is a closed structure, and the other end of the lifting cylinder is an open structure. An upper limit plate is provided at the other end of the lifting cylinder, and the upper limit plate is an annular structure. An air outlet is opened on the side wall of the lifting cylinder, and the air outlet is close to the other end of the lifting cylinder. And it is located below the upper limit plate, there are multiple air outlet holes, and the multiple air outlet holes are equidistantly arranged along the circumference of the lifting air cylinder. The inner wall of the lifting air cylinder is smooth, and a lower limit plate is provided in the lifting air cylinder, and the lower limit plate is an annular structure. The lower limit plate is close to one end of the lifting air cylinder, and an inflation tube is provided on the lifting air cylinder, and the inflation tube is connected to the lifting air cylinder. The inflation tube is close to one end of the lifting air cylinder and is located below the lower limit plate. The inflation tube is connected to the inflation pump through a connecting hose, one end of the lower limb lifting rod is slidably placed in the lifting air cylinder, and the other end passes through the upper limit plate and extends to the outside of the lifting air cylinder, the lower limb lifting rod is in contact with the side wall of the upper limit plate, and one end of the lower limb lifting rod is provided with a lifting piston, and the lifting piston is slidable. Placed in the lifting cylinder, the lifting piston is a cylindrical structure, the side wall of the lifting piston is in contact with the inner wall of the lifting cylinder, the height of the lifting piston is less than the distance from the upper limit plate to the air outlet, and the lower limb lifting assembly is composed of a U-shaped lower limb tray, a hinge shaft and a tray support rod, one end of the tray support rod is connected to the other end of the lower limb lifting rod through the hinge shaft, and a U-shaped lower limb tray is provided at the other end of the tray support rod. The bottom plate of the U-shaped lower limb tray is an arc structure, and the middle part of the U-shaped lower limb tray is connected to the other end of the tray support rod; a pressure sensor is provided on the bottom plate of the U-shaped lower limb tray, and a distance sensor is provided on the other end of the lower limb lifting rod. A signal converter is provided in the circular base, and a data processing is provided in the circular base. A controller is provided in the circular base, the pressure sensor and the signal converter are connected via a power line, the distance sensor and the signal converter are connected via a power line, the signal converter and the data processor are connected via a power line, the data processor and the controller are connected via a power line, and the controller and the air pump are connected via a power line; during the rising and falling process of the lifting piston, the distance sensor continuously obtains the distance between itself and the circular base - the distance is the largest when the lifting piston rises to the highest point, and the distance is the smallest when the lifting piston falls back to the lower limit plate, and at the same time transmits the distance signal to the signal converter, and the signal converter converts the distance signal into a distance number and transmits it to the data processor;When the patient's calf is placed on the U-shaped lower limb tray, the pressure sensor senses the pressure and transmits the pressure signal to the signal converter. The signal converter converts the pressure signal into a pressure number and transmits it to the data processor. The data processor processes the pressure data and distance data: when the lifting piston rises to the highest point, that is, the distance number is the maximum, the data processor sends an instruction to the controller, and the controller controls the inflation pump to stop inflation; when the lifting piston falls back to the lower limit plate, that is, the distance number is the minimum, if the pressure data is 0, it means that the patient's calf is not placed on the U-shaped lower limb tray, and the data processor sends an instruction to the controller, and the inflation pump remains stopped; if the pressure data is within the set threshold range, it means that the patient's calf is placed on the U-shaped lower limb tray, and the data processor sends an instruction to the controller, and the controller controls the inflation pump to start and fill the lifting cylinder with high-pressure gas.

2. The passive flexion training device for lower limb knee joints of hemiplegic patients according to claim 1, characterized in that A passive flexion training method for the lower limb knee joints of hemiplegic patients is used to perform automatic lifting and flexion training on the patient's lower limbs, which specifically includes the following steps: (1) The patient lies prone on the training bed, and the flexion training device is placed at the end of the bed so that the patient's calf can be placed flat in the U-shaped lower limb tray; (2) Start the air pump, fill the lifting cylinder with high-pressure gas, lift the lifting piston, and slowly raise the lower limb lifting rod. Push the patient's lower leg to flex through the U-shaped lower limb tray, so that the patient's knee joint is passively flexed between 85 degrees and 95 degrees. (3) The lifting piston continues to rise and reaches the space above the air outlet. High-pressure gas escapes from the air outlet. The gas strength in the lifting cylinder is insufficient. The lifting piston slides back to the lower limit plate under the action of gravity, and the U-shaped lower limb tray is separated from the patient's calf. (4) After the U-shaped lower limb tray is separated from the patient's calf, the patient maintains the knee flexion position for a certain period of time, and then slowly extends the lower limb. During this period, the patient can keep the lower limb at a certain point of joint movement, training the patient to master the control ability at each joint movement angle; (5) When the patient's lower limbs are fully extended, the patient's calves fall back onto the U-shaped lower limb tray. The air pump inflates the lifting cylinder according to the rules in step (3), and lifts the patient's lower limbs back and forth several times to perform knee flexion training.

3. The passive flexion training device for lower limb knee joints of hemiplegic patients according to claim 1, characterized in that The U-shaped lower limb tray is replaced by a W-shaped lower limb tray, which is placed at the other end of the tray support rod. The bottom plate of the W-shaped lower limb tray is continuously bent into a W shape. A pressure sensor is provided on the bottom plate of the W-shaped lower limb tray, and a distance sensor is provided on the side plate of the W-shaped lower limb tray.

4. The passive flexion training device for lower limb knee joints of hemiplegic patients according to claim 1, characterized in that A sponge cushion is provided on the bottom plate of the U-shaped lower limb tray. The width of the sponge cushion is greater than the width of the bottom plate of the U-shaped lower limb tray. The sponge cushion is an arc-shaped structure, and the thickness of the sponge cushion gradually decreases from the middle to both ends.

5. The passive flexion training device for lower limb knee joints of hemiplegic patients according to claim 1, characterized in that There are multiple rows of ventilation holes on the bottom plate of the U-shaped lower limb tray, and the multiple rows of ventilation holes are equidistantly arranged along the length direction of the bottom plate of the U-shaped lower limb tray. There are multiple ventilation holes in one row, and the multiple ventilation holes are equidistantly arranged along the width direction of the bottom plate of the U-shaped lower limb tray.

6. The passive flexion training device for lower limb knee joints for hemiplegic patients according to claim 1, characterized in that The design of the upper limit plate cooperating with the lower limit plate to limit the lifting piston can prevent the lifting piston from extending out of the lifting cylinder during the lifting process and sliding under the inflation tube during the falling process, making it impossible to lift the patient's calf back and forth continuously multiple times, affecting the flexion training of the patient's knee joint.

7. The lower limb knee joint passive flexion training device for hemiplegic patients according to claim 1, characterized in that The inflation tube cooperates with the lower limit plate to ensure that the lifting piston is always above the inflation tube, so that the high-pressure gas entering the lifting cylinder through the inflation tube can push the lifting piston multiple times, and lift the patient's lower limbs back and forth multiple times to perform knee joint training, reducing the burden on nurses.

8. The passive flexion training device for lower limb knee joints of hemiplegic patients according to claim 1, characterized in that The tray support rod is rotatably connected with the lower limb lifting rod, which enables the U-shaped lower limb tray to tilt accordingly as the patient's knee joint angle changes during the process of supporting the patient's calf, so that it always fits the patient's calf, thereby improving the support stability of the patient's lower limb during the patient's knee flexion training.

9. The lower limb knee joint passive flexion training device for hemiplegic patients according to claim 1, characterized in that One end of the inflation tube extends upward at an acute angle to the lifting cylinder for a distance, and then extends horizontally to the other end. The other end of the inflation tube is horizontal, which can be convenient for connecting to the inflation pump. The other end is set at an angle, so that the high-pressure gas entering the lifting cylinder through the inflation tube will not directly impact the lifting piston, thereby preventing the lifting piston from being subjected to a large direct impact force and rising rapidly, causing damage to the patient's lower limb knee joint.

10. The lower limb knee joint passive flexion training device for hemiplegic patients according to claim 1, characterized in that The side wall of the lifting piston is provided with a shallow gas-guiding thread groove, which can allow a small amount of high-pressure gas filled in the lifting cylinder to escape through the shallow gas-guiding thread groove, thereby reducing the pressure of the high-pressure gas and preventing the lifting piston from rising too quickly under the impact of the high-pressure gas. At the same time, when the lifting piston falls back, the residual gas in the lifting cylinder can be discharged through the shallow gas-guiding thread groove, thereby preventing the residual gas from forming compressed air in the lifting cylinder and affecting the falling of the lifting piston.

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