Knee joint physiotherapy device

Abstract

A knee joint physiotherapy device, comprising a thigh seat, a first support plate being mounted at the bottom of the thigh seat; a shank seat being hinged to the thigh seat; a telescopic air bag, comprising a plurality of expansion layers arranged in sequence along the telescopic direction, adjacent two expansion layers being in air path communication, each expansion layer being provided with a constraint portion on the side facing the thigh seat, the constraint portion making the telescopic air bag present an arc shape when inflated, the first end of the telescopic air bag being connected to the first support plate, the second end being connected to the bottom of the shank seat, the telescopic air bag being capable of making arc line reciprocating motion of the second end relative to the first end through telescoping; and a charging and discharging device being arranged at the thigh seat and being communicated with the telescopic air bag, the gas being charged into or discharged from the telescopic air bag through control, the gas pressure in the telescopic air bag being changed, the telescopic air bag being driven to telescope, and the shank seat being further driven to rotate around the hinge point relative to the first support plate.

Description

Technical Field

[0001] This utility model relates to the field of joint orthopedic technology, and in particular to a knee joint physiotherapy device. Background Technology

[0002] The knee joint is a core component for maintaining healthy motor function, especially important for elderly people who spend long periods at home or those recovering from injuries. When the lower limbs are inactive for extended periods, stiffness and poor blood flow can easily occur from the knee to the ankle. This product helps to perform flexion and extension exercises to rehabilitate the lower limbs, effectively restoring joint mobility, strengthening muscles, improving proprioception, and reducing pain.

[0003] Most existing related products on the market use push rod motors or cylinders as their driving technology. These products are relatively large and take up a lot of space, making them unfriendly to elderly people living at home or injured people with mobility issues. Moreover, push rod motors or cylinders are expensive and costly. Utility Model Content

[0004] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a knee joint physiotherapy device.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A knee joint physiotherapy device, including

[0007] Thigh seat, wherein a first support plate is mounted on the bottom of the thigh seat;

[0008] Lower leg seat, which is hinged to the thigh seat;

[0009] A telescopic airbag includes several expansion layers arranged sequentially along the telescopic direction, with air passages connecting adjacent expansion layers. Each expansion layer has a constraint portion on the side facing the thigh seat, the constraint portion causing the telescopic airbag to form an arc shape when inflated. A first end of the telescopic airbag is connected to a first support plate, and a second end is connected to the bottom of the calf seat. The telescopic airbag allows the second end to reciprocate in an arc relative to the first end through telescopic movement.

[0010] An inflation / deflation device is installed on the thigh seat and connected to the inflation bag. By controlling the inflation or deflation of gas into the telescopic air bag, the gas pressure inside the telescopic air bag is changed, thereby driving the telescopic air bag to extend and retract, which in turn causes the lower leg seat to rotate relative to the first support plate around the hinge point.

[0011] Furthermore, the constraint part is a pressing edge, which causes the telescopic air bag to expand into a fan shape after inflation.

[0012] Furthermore, the highest position of the lower leg seat during rotation is not higher than the height position of the thigh seat.

[0013] Furthermore, the bottom of the thigh seat is provided with a fixing plate, and the bottom of the calf seat is provided with a second support plate. The fixing plate is connected to the first support plate and the second support plate respectively by a first hinge and a second hinge, and the rotation angle of the first hinge and the second hinge is 0° to 90°.

[0014] Furthermore, the second hinge is provided with a torsion spring, and the two ends of the spring are respectively connected to the fixed plate and the second support plate.

[0015] Furthermore, the inflation / deflation device includes an air pump and an air valve, and the air pump, the air valve, and the telescopic air bag are connected sequentially through an air pipe along the gas flow direction.

[0016] Furthermore, it also includes a control device, which is electrically connected to the air pump and the air valve respectively, to control the inflation level of the air pump and the opening and closing of the air valve.

[0017] Furthermore, the thigh seat and the calf seat are respectively provided with support surfaces adapted to the contours of the corresponding limb parts.

[0018] Furthermore, it also includes a vibration motor, which is installed in the thigh seat and the calf seat respectively, and its vibration acts on the support surface to massage the thigh and calf.

[0019] Furthermore, it also includes a heating device, which is installed in the thigh seat and the calf seat respectively, and its heating effect is applied to the support surface to heat the thigh and calf.

[0020] The beneficial effects of this utility model are:

[0021] 1. This utility model proposes a knee joint physiotherapy device that directly drives the lower leg seat through the arc-shaped reciprocating motion of a telescopic air bag, simulating the flexion and extension trajectory of the human knee joint. The air bag has a small storage volume after deflation, making the product lightweight, compact, and relatively convenient to use. The inflation / deflation device effectively controls the air bag pressure, avoiding the rigid impact of traditional mechanical transmission while reducing noise during operation. It is suitable for postoperative rehabilitation and passive exercise therapy for chronic joint pain.

[0022] 2. The knee joint physiotherapy device proposed in this utility model has a pressed edge structure of the air bag layer that guides the air bag to bend in the direction when inflated, forming a fan-shaped expansion shape that matches the rotation axis of the knee joint, so that the air bag's expansion force always acts on the support part along the tangential direction, greatly reducing the radial force loss during the movement.

[0023] 3. The knee joint physiotherapy device proposed in this utility model has a separate hinged design for the fixing plate, the first support plate and the second support plate, which decomposes the knee joint movement into two independent rotational structures. The first hinge shares the initial rotational inertia of the thigh seat, and the second hinge precisely guides the movement trajectory of the lower leg seat, effectively dispersing the joint load. The physical limit design from 0° to 90° constructs a safe movement range, and mechanically blocks excessive movement, thus preventing ligament stretching damage caused by hyperextension.

[0024] 4. The present invention proposes a knee joint physiotherapy device with a modular air circuit system of air pump, air valve and air bag, which realizes gas directional closed-loop control. The air pump provides a stable pressure source, the air valve switches between three states: inflation, deflation and pressure holding, and the air pipe connection method facilitates maintenance and replacement.

[0025] 5. The knee joint physiotherapy device proposed in this utility model uses a vibration motor to transmit multi-frequency mechanical waves through a structure, which generates a synchronous deep tissue massage effect during joint movement, promoting local blood circulation and accelerating the removal of metabolic waste. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of a knee joint physiotherapy device according to the present invention;

[0028] Figure 2 This is one of the front views of a knee joint physiotherapy device according to this utility model;

[0029] Figure 3 This is a second front view of a knee joint physiotherapy device according to this utility model;

[0030] Figure 4 This is an exploded view of a knee joint physiotherapy device according to the present invention;

[0031] Figure 5 This is a schematic diagram of a knee joint physiotherapy device according to the present invention (thigh seat and calf seat omitted);

[0032] Figure 6 for Figure 5 Enlarged view of point A;

[0033] Figure 7 This is one of the schematic diagrams of the telescopic air bag of a knee joint physiotherapy device according to this utility model;

[0034] Figure 8 This is a second schematic diagram of the telescopic air bag of a knee joint physiotherapy device according to this utility model;

[0035] Figure 9 This is a schematic diagram of the first and second support parts of a knee joint physiotherapy device according to the present invention.

[0036] Figure 10 This is a scene illustration of the use of a knee joint physiotherapy device according to this utility model.

[0037] In the diagram, 10 is the thigh seat; 101 is the fixing plate; 102 is the first support plate; 20 is the lower leg seat; 201 is the second support plate; 30 is the telescopic air bag; 301 is the air bag layer; 302 is the pressing edge; 303 is the air nozzle; 401 is the air pump; 402 is the air valve; 403 is the air pipe; 501 is the first hinge; 502 is the second hinge; 60 is the control device; and 70 is the bed. Detailed Implementation

[0038] The following is combined with Figure 1-10 This utility model will be described in detail.

[0039] Example 1:

[0040] A knee joint physiotherapy device, such as Figure 1-4 As shown, including

[0041] Thigh seat 10, the bottom of which is equipped with a first support plate 102;

[0042] Lower leg seat 20, which is hinged to the thigh seat 10;

[0043] The telescopic airbag 30 includes several expansion layers arranged sequentially along the telescopic direction. Air passages connect adjacent expansion layers. Each expansion layer has a constraint portion on the side facing the thigh seat 10, which causes the telescopic airbag 30 to form an arc shape when inflated. A first end of the telescopic airbag 30 is connected to the first support plate 102, and a second end is connected to the bottom of the calf seat 20. The telescopic airbag 30 allows the second end to reciprocate in an arc relative to the first end through telescopic movement.

[0044] An inflation / deflation device is installed on the thigh seat 10 and connected to the inflation bag. By controlling the inflation or deflation of gas into the telescopic air bag 30, the gas pressure inside the telescopic air bag 30 is changed, thereby driving the telescopic air bag 30 to extend and retract, which in turn causes the calf seat 20 to rotate relative to the first support plate 102 around the hinge point.

[0045] A first support plate 102 is fixedly installed at the bottom of the thigh seat 10, and the calf seat 20 is rotatably connected to the thigh seat 10 via a hinge component. The telescopic air bag 30 consists of multiple independent expansion layers arranged continuously along its length, with the internal air passages of each expansion layer interconnected to form an integral air cavity. Each expansion layer has a linear constraint part on the side facing the thigh seat 10, which restricts the material's ductility, so that the air bag can only expand to one side when inflated, forcing the telescopic air bag 30 to bend into a predetermined arc shape. The first end of the telescopic air bag 30 is fixedly connected to the first support plate 102, and the last end is fixed to the bottom of the calf seat 20; when inflated, the air bag expands and extends layer by layer along the constraint direction, driving the last end to move in an arc around the first end as the center, thereby causing the calf seat 20 to flex and rotate relative to the thigh seat 10 around the hinge point; when deflated, the air bag contracts, and the calf seat 20 extends and returns to its original position. The inflation and deflation device is integrated into the thigh seat 10 and is connected to the telescopic air bag 30 through a gas pipeline, and the telescopic movement is controlled by adjusting the gas pressure inside the air bag.

[0046] In this embodiment, as Figure 7-8 As shown, the constraint part is the pressing edge 302, which causes the telescopic air bag 30 to expand into a fan shape after being inflated.

[0047] The telescopic airbag 30 is composed of multiple interconnected airbag layers 301 stacked sequentially along the telescopic direction. Each airbag layer 301 has a pressing edge 302 structure at its inner edge facing the center of knee flexion. When the inflation / deflation device inflates the airbag, each airbag layer 301 begins to expand. Due to the constraint of the inner pressing edge 302, the expansion of the airbag layer 301 in the inner direction is significantly restricted, while it can expand freely in the outer direction. This restricted expansion causes the entire telescopic airbag 30 to naturally bend and extend outward when inflated, ultimately presenting a unique fan shape. This fan-shaped structure conforms to the arc trajectory followed by the flexion and extension movement of the knee joint, allowing the telescopic movement of the airbag to be more smoothly and efficiently converted into the arc swing of the lower leg seat 20.

[0048] In this embodiment, the highest position of the lower leg seat 20 during rotation is not higher than the height of the thigh seat 10. The coordinated movement of the telescopic air bag 30 is restricted so that when the lower leg seat 20 rotates to its highest position towards the thigh seat 10, its overall height is never higher than the horizontal plane where the upper surface of the thigh seat 10 is located. This restriction is achieved through mechanical stops or the maximum expansion size of the air bag, preventing excessive flexion of the knee joint.

[0049] In this embodiment, as Figure 9As shown, the bottom of the thigh seat 10 is also provided with a fixing plate 101, and the bottom of the calf seat 20 is provided with a second support plate 201. The fixing plate 101 is connected to the first support plate 102 and the second support plate 201 by a first hinge 501 and a second hinge 502, respectively. The rotation angle of the first hinge 501 and the second hinge 502 is 0° to 90°.

[0050] A fixing plate 101 is added to the bottom of the thigh seat 10, and the fixing plate 101 is connected to the first support plate 102 of the thigh seat 10 and the second support plate 201 of the calf seat 20. The fixing plate 101 is connected to the first support plate 102 via a first hinge 501, and the fixing plate 101 is connected to the second support plate 201 via a second hinge 502. The two hinges are coaxially arranged. The first hinge 501 allows relative rotation between the thigh seat 10 and the fixing plate 101, and the second hinge 502 allows relative rotation between the calf seat 20 and the fixing plate 101. The two hinges work together to ensure that the knee joint rotation angle covers the physiological range of full extension to maximum flexion.

[0051] In this embodiment, the second hinge 502 is provided with a torsion spring, and the two ends of the torsion spring are respectively connected to the fixing plate 101 and the second support plate 201.

[0052] A torsion spring mechanism is provided inside the second hinge 502. The helical part of the torsion spring is sleeved on the hinge shaft, with one end fixed to the fixed plate 101 and the other end fixed to the second support plate 201. When the lower leg seat 20 flexes, the torsion spring stores energy. When the air bag contracts, the torsion spring releases its elastic force to assist the lower leg seat 20 in extending and returning to its original position, while also providing cushioning for movement.

[0053] In this embodiment, as Figure 5-6 As shown, the inflation / deflation device includes an air pump 401 and an air valve 402. The air pump 401, the air valve 402, and the telescopic air bag 30 are connected sequentially along the gas flow direction via an air pipe 403. The air outlet of the air pump 401 is connected to the inlet of the air valve 402 via the air pipe 403, and the outlet of the air valve 402 is connected to the air nozzle 303 of the telescopic air bag 30 via the air pipe 403. The air pump 401 provides a gas pressure source, and the air valve 402 controls the gas to be filled into the air bag or discharged from the air bag to the atmosphere by switching the flow direction.

[0054] In this embodiment, a control device 60 is also included. The control device 60 is electrically connected to the air pump 401 and the air valve 402 respectively to control the inflation level of the air pump 401 and the opening and closing of the air valve 402.

[0055] The control device 60 specifically establishes an electrical connection with the air pump 401 and the air valve 402 via wires or wireless signals. The control device 60 can send control signals to the air pump 401 according to a preset program or user-input commands, dynamically adjusting the motor speed or operating power of the air pump 401 to control the gas filling rate and flow rate. Simultaneously, the control device 60 also sends control signals to the air valve 402, precisely controlling its opening and closing states and the degree of opening. By coordinating the inflation capacity of the air pump 401 and the on / off state and duration of the air valve 402, the control device 60 can achieve high-precision adjustment of parameters such as the knee flexion angle, flexion and extension rate, number of flexion and extension cycles, and the time to maintain a specific angle during the extension and contraction of the telescopic air bag 30, meeting different physiotherapy needs.

[0056] In this embodiment, the thigh seat 10 and calf seat 20 are respectively provided with support surfaces adapted to the contours of the corresponding limb parts. The upper surface of the thigh seat 10 is designed as a concave curved surface adapted to the physiological contours of the back and sides of the human thigh. Similarly, the upper surface of the calf seat 20 is also designed as a concave curved surface adapted to the contours of the back and sides of the human calf. This biomimetic support surface can tightly and evenly support the user's thigh and calf, significantly increasing the contact area, effectively dispersing local pressure, avoiding pain or affecting blood circulation, ensuring that the user feels comfortable and stable during physiotherapy, and ensuring that the therapeutic force can be effectively transmitted to the target area.

[0057] The present invention provides a knee joint physiotherapy device, the method of which is as follows:

[0058] like Figure 10 As shown, place the physiotherapy device on the side of the bed 70, ensuring that the fixing plate 101 is tightly against the edge of the bed 70 surface, and adjust the first support plate 102 to be tightly against the side of the bed 70. The patient sits on the side of the bed 70, with the back of the thigh fully against the recessed support surface of the thigh seat 10, and the back of the calf embedded in the curved groove of the calf seat 20. Adjust the straps of the thigh seat 10 and the calf seat 20 respectively to make the limb stable and fixed without pressure, and ensure that the knee joint is aligned with the hinge axis.

[0059] The treatment mode is selected via handheld remote control or control panel. After activation, air pump 401 starts working. Air valve 402 opens the inflation channel, and gas is injected into the telescopic air bag 30, causing it to expand layer by layer, pushing the lower leg seat 20 to rotate upward in an arc to the set knee flexion angle; then air valve 402 switches the exhaust channel, the air bag contracts, and the lower leg seat 20 slowly extends and returns to its original position with the assistance of torsion spring.

[0060] Example 2:

[0061] This embodiment adds an auxiliary massage function, specifically by embedding and installing at least one vibration motor in the internal cavity of the thigh seat 10, and similarly, at least one vibration motor is also embedded in the internal cavity of the calf seat 20.

[0062] The vibration motor generates mechanical vibrations when powered on. This vibrational energy is transmitted to the respective support surfaces of the thigh seat 10 and calf seat 20 through their structures. When the user places their thighs and calves on the support surfaces for knee flexion and extension therapy, these vibrations act on the muscle tissue at the contact points, producing a massage effect. This vibrational massage helps promote blood circulation in the legs, relax muscles, relieve muscle tension and fatigue, and enhance the therapeutic effect.

[0063] Example 3:

[0064] This embodiment adds a heat therapy function. Specifically, a heating device, such as an electric heating wire, a carbon fiber heating element, or a PTC heater, is installed in the internal cavity of the thigh seat 10. Similarly, a similar heating device is installed in the internal cavity of the calf seat 20.

[0065] When the heating device is powered on, it generates heat. This heat is transferred to the support surfaces of the thigh seat 10 and calf seat 20 via thermal conduction. When the user's thighs and calves come into contact with the heated support surfaces, the heat penetrates into the subcutaneous tissue, providing a gentle warming effect on the leg muscles and joints. The warm compress helps dilate blood vessels, promotes local blood circulation, relaxes muscles and ligaments, relieves stiffness and pain, and further enhances the comfort and effectiveness of the physical therapy.

[0066] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the scope of protection of this utility model.

Claims

1. A knee joint physiotherapy device, characterized in that, include Thigh seat, wherein a first support plate is mounted on the bottom of the thigh seat; Lower leg seat, which is hinged to the thigh seat; The telescopic airbag includes several expansion layers arranged sequentially along the telescopic direction. The air passage between two adjacent expansion layers is connected. Each expansion layer has a constraint part on the side facing the thigh seat. The constraint part makes the telescopic airbag take on an arc shape when inflated. The first end of the telescopic airbag is connected to the first support plate, and the second end is connected to the bottom of the calf seat. The telescopic airbag can make the second end reciprocate in an arc relative to the first end by telescopic movement. as well as An inflation / deflation device is installed on the thigh seat and connected to the inflation bag. By controlling the inflation or deflation of gas into the telescopic air bag, the gas pressure inside the telescopic air bag is changed, thereby driving the telescopic air bag to extend and retract, which in turn causes the lower leg seat to rotate relative to the first support plate around the hinge point.

2. The knee joint physiotherapy device as described in claim 1, characterized in that, The constraint part is a pressing edge, which causes the telescopic air bag to expand into a fan shape after being inflated.

3. The knee joint physiotherapy device as described in claim 1, characterized in that, The highest position of the lower leg seat during rotation is not higher than the height of the thigh seat.

4. A knee joint physiotherapy device as described in claim 1, characterized in that, The bottom of the thigh seat is also provided with a fixing plate, and the bottom of the calf seat is provided with a second support plate. The fixing plate is connected to the first support plate and the second support plate respectively by a first hinge and a second hinge. The rotation angle of the first hinge and the second hinge is 0° to 90°.

5. A knee joint physiotherapy device as described in claim 4, characterized in that, The second hinge is provided with a torsion spring, and the two ends of the torsion spring are respectively connected to the fixed plate and the second support plate.

6. A knee joint physiotherapy device as described in claim 1, characterized in that, The inflation / deflation device includes an air pump and an air valve, and the air pump, the air valve, and the telescopic air bag are connected in sequence through an air pipe along the gas flow direction.

7. A knee joint physiotherapy device as described in claim 6, characterized in that, It also includes a control device, which is electrically connected to the air pump and the air valve respectively, to control the inflation level of the air pump and the opening and closing of the air valve.

8. A knee joint physiotherapy device as described in claim 1, characterized in that, The thigh seat and calf seat are respectively provided with support surfaces adapted to the contours of the corresponding limb parts.

9. A knee joint physiotherapy device as described in claim 1, characterized in that, It also includes a vibration motor, which is installed in the thigh seat and the calf seat respectively, and its vibration acts on the support surface to massage the thigh and calf.

10. A knee joint physiotherapy device as described in claim 1, characterized in that, It also includes heating devices, which are respectively installed in the thigh seat and the calf seat, and their heating effect is applied to the support surface to heat the thigh and calf.

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