A single joint assisted resistance switching muscle training device for patients with inflammatory myopathy

Abstract

This invention provides a single-joint resistance-assisted switching muscle training device for patients with inflammatory myopathy, comprising: a rotating assembly; and a first rotating arm. The single-joint resistance-assisted switching muscle training device provided by this invention utilizes the coordinated structures of the rotating assembly, the first rotating arm, the second rotating arm, a rotating component, a connecting assembly, and a resistance adjustment assembly. During joint flexion and extension, the first and second rotating arms rotate relative to each other. The rotating assembly drives the threaded sleeve to rotate, and the threaded transmission drives the threaded rod to move back and forth. This movement, via the moving rod, causes the moving plate to translate, changing the contact pressure and contact area between the first and second resistance plates. This linearly and quantitatively adjusts the rotational damping, achieving precise graded adjustment of resistance. This solves the problems of non-linear resistance, difficulty in precise control and quantitative adjustment in traditional elastic band trainers, and is suitable for the training intensity needs of patients with inflammatory myopathy at different rehabilitation stages.

Description

Technical Field

[0001] This invention relates to the field of medical devices for rehabilitation of inflammatory myopathy, and in particular to a single-joint resistance-assisted switching muscle training device for patients with inflammatory myopathy. Background Technology

[0002] Inflammatory myopathy (including polymyositis, dermatomyositis, etc.) is a group of autoimmune diseases characterized by chronic inflammation of skeletal muscles. Clinical manifestations include progressive muscle weakness, muscle atrophy, and decreased exercise tolerance, with the proximal muscles of the limbs (such as the shoulder girdle muscles and pelvic girdle muscles) being most significantly affected. For patients with inflammatory myopathy, appropriate muscle rehabilitation training is an important means to slow down muscle weakness, improve motor function, and enhance quality of life.

[0003] Single-joint training (such as elbow flexion and extension, knee flexion and extension) can specifically train specific muscle groups and avoid compensatory movement patterns, making it a fundamental training method in the rehabilitation of patients with myopathy. Single-joint training devices typically include two rotating arms, fixed to the proximal and distal ends of the limb, respectively. The arms rotate relative to each other through joint flexion and extension, achieving active or passive training of the target muscle group. Currently, the main single-joint rehabilitation training devices on the market are simple elastic band trainers. Elastic band trainers rely on the stretching of the elastic band to provide resistance and have a simple structure. However, the relationship between resistance and displacement is non-linear, and the magnitude of resistance is difficult to precisely control and quantify.

[0004] Therefore, it is necessary to provide a single-joint resistance-switching muscle training device for patients with inflammatory myopathy to solve the above-mentioned technical problems. Summary of the Invention

[0005] This invention provides a single-joint resistance-assisted switching muscle training device for patients with inflammatory myopathy, which solves the problem that the relationship between resistance and displacement is non-linear and that the magnitude of resistance is difficult to control and quantify.

[0006] To address the aforementioned technical problems, this invention provides a single-joint resistance-switching muscle training device for patients with inflammatory myopathy, comprising:

[0007] Rotating component;

[0008] A first rotating arm is disposed at the top of the rotating assembly;

[0009] The second rotating arm is disposed at the bottom of the rotating assembly;

[0010] A rotating component, the rotating component being disposed on the side of the rotating component;

[0011] Two connecting components are respectively sleeved on the outer sides of the first rotating arm and the second rotating arm;

[0012] A resistance adjustment component is provided on the inner side of the rotating component to adjust the resistance when the rotating component rotates.

[0013] Preferably, the rotating assembly includes a mounting frame, a fixing tube is fixedly mounted on the inner side of the mounting frame, and the rotating frame is rotatably connected to the outer side of the fixing tube via a bearing.

[0014] Preferably, the bottom of the first rotating arm is fixedly installed on the top of the mounting frame, and the top of the second rotating arm is fixedly installed on the bottom of the rotating frame.

[0015] Preferably, the resistance adjustment assembly includes a threaded sleeve, one end of the outer side of the threaded sleeve is rotatably connected to the interior of one side of the mounting frame, and the other end of the threaded sleeve is internally threaded with a threaded rod. A fixing plate is fixedly installed at one end of the threaded rod. Movable rods are fixedly installed at the top and bottom of the fixing plate. Sliding grooves are formed at the top and bottom of the fixing sleeve. The movable rod is slidably connected to the inner side of the sliding groove. A movable plate is fixedly installed at one end of the movable rod. A first resistance piece is fixedly installed on one side of the movable plate. A second resistance piece is attached to one side of the first resistance piece. A mounting plate is fixedly installed on one side of the second resistance piece. A support seat is rotatably connected to the inner side of the mounting plate via a bearing. One end of the outer side of the support seat is fixedly installed on the inner side of the rotating frame.

[0016] Preferably, the outer side of the mounting plate is provided with a one-way component, the one-way component includes a helical gear ring, the helical gear ring is fixedly installed on the outer side of the mounting plate, the top and bottom of the helical gear ring are engaged with helical gear plates, one side of each of the two helical gear plates is fixedly installed with a telescopic tube, the outer side of each of the two telescopic tubes is sleeved with a first spring, and one end of each of the two telescopic tubes is fixedly installed on the top and bottom of the inner side of the rotating frame, respectively.

[0017] Preferably, a torsion spring is fixedly installed on the outer side of the fixing tube, and the outer side of the torsion spring is fixedly installed on the inner side of the rotating frame.

[0018] Preferably, the rotating assembly includes a side plate, which is fixedly installed on one side of the mounting frame. An outer ring is fixedly installed on one side of the side plate, and a knob is provided on the inner side of the outer ring. A support plate is fixedly installed on the inner side of the knob. A first ratchet is fixedly installed on one side of the support plate, and a second ratchet is engaged on one side of the first ratchet. A support ring is fixedly installed on the inner side of the second ratchet, and one end of the support ring is fixedly installed on one end of the side plate.

[0019] Preferably, a square rod is fixedly installed at one end of the threaded sleeve, a second spring is fixedly installed at one end of the square rod, a sliding cavity is provided inside the knob, the square rod is slidably connected to the inner side of the sliding cavity, and the second spring is disposed on the inner side of the sliding cavity.

[0020] Preferably, the connecting component includes an elastic band, with a first Velcro fastener fixedly installed at one end of the outer side of the elastic band and a second Velcro fastener fixedly installed at one end of the inner side of the elastic band.

[0021] Preferably, the outer side of the elastic band is fitted with multiple sponge sleeves.

[0022] Compared with related technologies, the single-joint resistance-assisted switching muscle training device for patients with inflammatory myopathy provided by the present invention has the following beneficial effects:

[0023] This invention provides a single-joint resistance-assisted switching muscle training device for patients with inflammatory myopathy. Through the coordinated structure of a rotating component, a first rotating arm, a second rotating arm, a rotating assembly, a connecting assembly, and a resistance adjustment assembly, the first and second rotating arms rotate relative to each other during joint flexion and extension. The rotating assembly drives the threaded sleeve to rotate, and the threaded transmission drives the threaded rod to move back and forth. This movement, via a moving rod, causes the moving plate to translate, changing the contact pressure and contact area between the first and second resistance plates. This linearly and quantitatively adjusts the rotational damping, achieving precise graded resistance adjustment. This solves the problems of non-linear resistance, difficulty in precise control and quantitative adjustment in traditional elastic band trainers, and is suitable for the training intensity needs of patients with inflammatory myopathy at different rehabilitation stages. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of a first embodiment of a single-joint resistance-assisted switching muscle training device for patients with inflammatory myopathy provided by the present invention.

[0025] Figure 2 for Figure 1 The diagram shows a cross-sectional view of the rotating assembly.

[0026] Figure 3 for Figure 2 The enlarged schematic diagram of part A shown below;

[0027] Figure 4 for Figure 3 The diagram shows the support structure.

[0028] Figure 5 This is a schematic diagram of the structure of a second embodiment of a single-joint resistance-assisted switching muscle training device for patients with inflammatory myopathy provided by the present invention.

[0029] Figure 6This is a schematic diagram of the third embodiment of a single-joint resistance-assisted switching muscle training device for patients with inflammatory myopathy provided by the present invention.

[0030] The diagram is labeled as follows: 1. Rotating assembly, 11. Mounting frame, 12. Fixing tube, 13. Rotating frame, 2. Rotating assembly, 3. First rotating arm, 4. Second rotating arm, 5. Connecting assembly, 6. Torsion spring, 7. Resistance adjustment assembly, 71. Threaded sleeve, 72. Threaded rod, 73. Fixing plate, 74. Moving rod, 75. Slide groove, 76. Moving plate, 77. First resistance plate, 78. Second resistance plate, 79. Mounting plate, 70. Support seat, 8. One-way assembly, 81. Helical tooth ring, 82. Helical tooth plate, 83. Telescopic tube, 84. First spring, 21. Side plate, 22. Outer ring, 23. Knob, 24. Support plate, 25. First ratchet, 26. Second ratchet, 27. Support ring, 28. Square rod, 29. Slide cavity, 20. Second spring, 51. Elastic band, 52. First Velcro, 53. Second Velcro, 54. Sponge sleeve. Detailed Implementation

[0031] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0032] First Embodiment

[0033] Please refer to the following: Figure 1 , Figure 2 , Figure 3 , Figure 4 ,in, Figure 1 This is a schematic diagram of the structure of a first embodiment of a single-joint resistance-assisted switching muscle training device for patients with inflammatory myopathy provided by the present invention. Figure 2 for Figure 1 The diagram shows a cross-sectional view of the rotating assembly. Figure 3 for Figure 2 The enlarged schematic diagram of part A shown below; Figure 4 for Figure 3 The diagram shows the support structure.

[0034] A single-joint resistance-assisted switching muscle training device for patients with inflammatory myopathy, comprising: a rotating component 1;

[0035] The first rotating arm 3 is disposed on the top of the rotating assembly 1;

[0036] The second rotating arm 4 is disposed at the bottom of the rotating assembly 1;

[0037] Rotating component 2, which is disposed on the side of rotating component 1;

[0038] Two connecting components 5 are respectively sleeved on the outer sides of the first rotating arm 3 and the second rotating arm 4;

[0039] The damping adjustment component 7 is disposed on the inner side of the rotating component 1 and is used to adjust the resistance when the rotating component 1 rotates.

[0040] The rotating assembly 1 includes a mounting frame 11, on the inner side of which a fixing tube 12 is fixedly mounted, and on the outer side of which a rotating frame 13 is rotatably connected via a bearing.

[0041] The mounting frame 11 is an integral fixed base, the fixed tube 12 achieves center positioning, and the rotating frame 13 rotates coaxially by bearings. The first rotating arm 3 and the second rotating arm 4 are respectively fixed to the mounting frame 11 and the rotating frame 13, which can simulate the flexion, extension and rotation of a single joint of the human body. The rotation coaxiality is high, there is no jamming or sticking, and it is suitable for gentle joint rehabilitation activities.

[0042] The bottom of the first rotating arm 3 is fixedly installed on the top of the mounting frame 11, and the top of the second rotating arm 4 is fixedly installed on the bottom of the rotating frame 13.

[0043] The first rotating arm 3 and the second rotating arm 4 belong to two sets of bases, one fixed and one rotating. When the joint is bent, the two arms rotate relative to each other, perfectly replicating the flexion and extension stroke of the knee and elbow joints. The training force path conforms to the physiological joint movement angle of the human body, avoiding compensatory joint damage during training.

[0044] The resistance adjustment assembly 7 includes a threaded sleeve 71. One end of the outer side of the threaded sleeve 71 is rotatably connected to the inside of one side of the mounting frame 11. The other end of the threaded sleeve 71 is internally threaded with a threaded rod 72. One end of the threaded rod 72 is fixedly mounted with a fixing plate 73. Movable rods 74 are fixedly mounted on the top and bottom of the fixing plate 73. The top and bottom of the fixing tube 12 are provided with sliding grooves 75. The movable rods 74 are slidably connected to the inner side of the sliding grooves 75. One end of the movable rod 74 is fixedly mounted with a movable plate 76. A first resistance piece 77 is fixedly mounted on one side of the movable plate 76. A second resistance piece 78 is attached to one side of the first resistance piece 77. A mounting plate 79 is fixedly mounted on one side of the second resistance piece 77. A support seat 70 is rotatably connected to the inner side of the mounting plate 79 via a bearing. One end of the outer side of the support seat 70 is fixedly mounted on the inner side of the rotating frame 13.

[0045] Rotating the outer rotating component 2 drives the threaded sleeve 71 to rotate, and the threaded transmission drives the threaded rod 72 to push back and forth, driving the moving rod 74 to translate along the slide groove 75, changing the degree of contact and tightness between the first resistance plate 77 and the second resistance plate 78; the contact area and pressure of the friction plates change synchronously, and the rotational damping can be adjusted linearly and quantitatively to achieve precise resistance grading, which is suitable for the phased rehabilitation training of patients with inflammatory myopathy from weak to strong.

[0046] A one-way component 8 is provided on the outer side of the mounting plate 79. The one-way component 8 includes a helical gear ring 81, which is fixedly installed on the outer side of the mounting plate 79. Helical gear plates 82 are engaged at the top and bottom of the helical gear ring 81. Telescopic tubes 83 are fixedly installed on one side of each of the two helical gear plates 82. A first spring 84 is sleeved on the outer side of each of the two telescopic tubes 83. One end of each of the two telescopic tubes 83 is fixedly installed on the top and bottom of the inner side of the rotating frame 13, respectively.

[0047] The oblique toothed ring 81 and the oblique toothed plate 82 form a one-way limiting structure, which can be switched to a one-way locking state. When the joint flexes and contracts, the oblique toothed plate 82 and the oblique toothed ring 81 lock to prevent the mounting plate 79 from rotating, so that the first resistance plate 76 and the second resistance plate 77 rub against each other to form a resistance training mode. When the joint extends, the oblique toothed ring 81 pushes the oblique toothed plate 82 to move upward, so that the first spring 84 contracts. At this time, the mounting plate 79 can rotate on the outer side of the support seat 70. At this time, the torsion spring 6 provides auxiliary rebound force. The rehabilitation mode can be switched with one button, which is suitable for passive assisted training for patients with extremely weak muscle strength.

[0048] A torsion spring 6 is fixedly installed on the outer side of the fixed tube 12, and the outer side of the torsion spring 6 is fixedly installed on the inner side of the rotating frame 13.

[0049] When the joint is bent, the torsion spring 6 stores elastic potential energy; when the joint is extended, the torsion spring 6 releases the potential energy to assist the patient.

[0050] The working principle of the single-joint resistance-assisted switching muscle training device for patients with inflammatory myopathy provided by this invention is as follows:

[0051] The patient fixes the first rotating arm 3 to the proximal limb of the joint (such as the upper arm or thigh) via the connecting component 5, and the second rotating arm 4 to the distal limb of the joint (such as the forearm or lower leg). During joint flexion and extension, the first rotating arm 3 is fixed, and the second rotating arm 4 drives the rotating frame 13 to rotate around the fixed tube 12 as the joint moves, simulating the flexion and extension movement of a single joint in the human body.

[0052] The rotating component 2 drives the threaded sleeve 71 to rotate. The threaded sleeve 71 drives the threaded rod 72 to move back and forth through the threaded transmission. The threaded rod 72 drives the moving plate 76 to translate via the fixed plate 73 and the moving rod 74, changing the contact pressure between the first resistance plate 77 and the second resistance plate 78. The greater the contact pressure, the greater the friction force that the rotating frame 13 needs to overcome when rotating, and the greater the training resistance, thereby achieving linear and quantitative graded resistance adjustment.

[0053] In the unidirectional component 8, the helical gear ring 81 and the helical gear plate 82 form a unidirectional locking structure. When the joint is bent, the helical gear plate 82 and the helical gear ring 81 are locked, the mounting plate 79 is fixed, and the first resistance plate 77 and the second resistance plate 78 generate frictional resistance, forming a resistance training mode; when the joint is extended, the helical gear ring 81 pushes the helical gear plate 82 to compress the first spring 84 and move upward, and the mounting plate 79 can rotate freely on the support seat 70. At this time, the torsion spring 6 provides auxiliary rebound force, forming an assist mode.

[0054] Compared with related technologies, the single-joint resistance-assisted switching muscle training device for patients with inflammatory myopathy provided by the present invention has the following beneficial effects:

[0055] Through the coordinated structure of rotating component 1, first rotating arm 3, second rotating arm 4, rotating component 2, connecting component 5, and resistance adjustment component 7, the first rotating arm 3 and the second rotating arm 4 rotate relative to each other during joint flexion and extension. Rotating component 2 drives threaded sleeve 71 to rotate, and threaded transmission drives threaded rod 72 to move back and forth. Through moving rod 74, moving plate 76 is moved, changing the contact pressure and contact area between first resistance plate 77 and second resistance plate 78. This linearly and quantitatively adjusts the rotational damping, achieving precise graded adjustment of resistance. This solves the problems of nonlinear resistance, difficulty in precise control and quantitative adjustment of traditional elastic band trainers, and is suitable for the training intensity needs of patients with inflammatory myopathy at different rehabilitation stages.

[0056] Second Embodiment

[0057] Please refer to the following: Figure 5 Based on the first embodiment of this application, which provides a single-joint resistance-switching muscle training device for patients with inflammatory myopathy, the second embodiment of this application proposes another single-joint resistance-switching muscle training device for patients with inflammatory myopathy. The second embodiment is merely a preferred embodiment of the first embodiment, and the implementation of the second embodiment will not affect the separate implementation of the first embodiment.

[0058] Specifically, the second embodiment of this application provides a single-joint resistance-assisted switching muscle training device for patients with inflammatory myopathy, which differs in that the rotating component 2 includes a side plate 21, which is fixedly installed on one side of the mounting frame 11. An outer ring 22 is fixedly installed on one side of the side plate 21. A knob 23 is provided on the inner side of the outer ring 22. A support plate 24 is fixedly installed on the inner side of the knob 23. A first ratchet 25 is fixedly installed on one side of the support plate 24. A second ratchet 26 is engaged on one side of the first ratchet 25. A support ring 27 is fixedly installed on the inner side of the second ratchet 26. One end of the support ring 27 is fixedly installed on one end of the side plate 21.

[0059] A square rod 28 is fixedly installed at one end of the threaded sleeve 71, and a second spring 20 is fixedly installed at one end of the square rod 28. A sliding cavity 29 is opened inside the knob 23. The square rod 28 is slidably connected to the inner side of the sliding cavity 29, and the second spring 20 is disposed on the inner side of the sliding cavity 29.

[0060] Pressing the knob 23 compresses the second spring 20, disengaging the ratchet. At this time, the knob 23 can drive the threaded sleeve 71 to rotate via the square rod 28. When the knob 23 is released, the first ratchet 25 and the second ratchet 26 engage, thereby limiting the knob 23.

[0061] The working principle of the single-joint resistance-assisted switching muscle training device for patients with inflammatory myopathy provided by this invention is as follows:

[0062] Pressing knob 23 causes the first ratchet 25 to move inward, compressing the second spring 20 and disengaging the first ratchet 25 from the second ratchet 26. At this time, knob 23 can rotate the threaded sleeve 71 through the sliding engagement of the square rod 28 and the sliding cavity 29, thereby adjusting the resistance. After adjusting the resistance, releasing knob 23 causes the second spring 20 to reset, pushing knob 23 outward. The first ratchet 25 and second ratchet 26 re-engage, locking knob 23 in its current position. Support ring 27, fixed to side plate 21, provides fixed support for the second ratchet 26, while outer ring 22 provides limiting protection for knob 23.

[0063] Compared with related technologies, the single-joint resistance-assisted switching muscle training device for patients with inflammatory myopathy provided by the present invention has the following beneficial effects:

[0064] By setting the rotating component 2, after pressing the knob 23 to disengage the first ratchet 25 from the second ratchet 26, the knob 23 drives the threaded sleeve 71 to rotate via the square rod 28 to complete the resistance adjustment. When the knob 23 is released, the second spring 20 resets and pushes the first ratchet 25 and the second ratchet 26 to re-engage and lock, ensuring that the adjusted resistance value remains stable and preventing unexpected changes in resistance due to vibration during training, thereby improving the reliability and safety of training parameters.

[0065] Third Embodiment

[0066] Please refer to the following: Figure 6 Based on the first embodiment of this application, which provides a single-joint resistance-assisted switching muscle training device for patients with inflammatory myopathy, the third embodiment of this application proposes another single-joint resistance-assisted switching muscle training device for patients with inflammatory myopathy. The third embodiment is merely a preferred embodiment of the first embodiment, and the implementation of the second embodiment will not affect the individual implementation of the first embodiment.

[0067] Specifically, the third embodiment of this application provides a single-joint resistance-assisted switching muscle training device for patients with inflammatory myopathy, wherein the connecting component 5 includes an elastic band 51, a first Velcro 52 is fixedly installed on one end of the outer side of the elastic band 51, and a second Velcro 53 is fixedly installed on one end of the inner side of the elastic band 51.

[0068] The outer side of the elastic band 51 is fitted with multiple sponge sleeves 54.

[0069] The working principle of the single-joint resistance-assisted switching muscle training device for patients with inflammatory myopathy provided by this invention is as follows:

[0070] After the patient wraps the elastic band 51 around the limb, the second Velcro 53 at one end of the elastic band 51 is attached to the first Velcro 52 on the outer side of the other end. The attachment position is adjusted according to the limb's thickness to complete the fixation of the device to the limb. The sponge sleeve 54 is placed on the outer side of the elastic band 51 to cushion the pressure of the elastic band 51 on the limb's skin during training, avoiding marks or discomfort.

[0071] Compared with related technologies, the single-joint resistance-assisted switching muscle training device for patients with inflammatory myopathy provided by the present invention has the following beneficial effects:

[0072] With the connection component 5, the elastic band 51 is wrapped around the limb and then fixed by the first Velcro 52 and the second Velcro 53. The bonding position can be adjusted according to the limb thickness to achieve a stable fit. The sponge sleeve 54 is placed on the outer side of the elastic band 51 to cushion the pressure and avoid marks or skin discomfort during training, thus improving the patient's comfort and the reliability of the device's fixation.

[0073] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A single-joint resistance-switching muscle training device for patients with inflammatory myopathy, characterized in that, include: Rotating component; A first rotating arm is disposed at the top of the rotating assembly; The second rotating arm is disposed at the bottom of the rotating assembly; A rotating component, the rotating component being disposed on the side of the rotating component; Two connecting components are respectively sleeved on the outer sides of the first rotating arm and the second rotating arm; A resistance adjustment component is provided, wherein the damping adjustment component is disposed on the inner side of the rotating component, and is used to adjust the resistance when the rotating component rotates.

2. The single-joint resistance-assisted switching muscle training device for patients with inflammatory myopathy according to claim 1, characterized in that, The rotating assembly includes a mounting frame, on the inner side of which a fixing tube is fixedly mounted, and on the outer side of which the fixing tube is rotatably connected to the rotating frame via a bearing.

3. A single-joint resistance-assisted switching muscle training device for patients with inflammatory myopathy according to claim 2, characterized in that, The bottom of the first rotating arm is fixedly installed on the top of the mounting frame, and the top of the second rotating arm is fixedly installed on the bottom of the rotating frame.

4. A single-joint resistance-assisted switching muscle training device for patients with inflammatory myopathy according to claim 2, characterized in that, The resistance adjustment assembly includes a threaded sleeve. One end of the outer side of the threaded sleeve is rotatably connected to the interior of one side of the mounting frame. The other end of the threaded sleeve is internally threaded with a threaded rod. A fixing plate is fixedly installed at one end of the threaded rod. Movable rods are fixedly installed at the top and bottom of the fixing plate. Sliding grooves are formed at the top and bottom of the fixing sleeve. The movable rod is slidably connected to the inner side of the sliding groove. A movable plate is fixedly installed at one end of the movable rod. A first resistance piece is fixedly installed on one side of the movable plate. A second resistance piece is attached to one side of the first resistance piece. A mounting plate is fixedly installed on one side of the second resistance piece. A support seat is rotatably connected to the inner side of the mounting plate via a bearing. One end of the outer side of the support seat is fixedly installed on the inner side of the rotating frame.

5. A single-joint resistance-assisted switching muscle training device for patients with inflammatory myopathy according to claim 4, characterized in that, The outer side of the mounting plate is provided with a one-way component, which includes a helical gear ring. The helical gear ring is fixedly installed on the outer side of the mounting plate. The top and bottom of the helical gear ring are engaged with helical gear plates. One side of each of the two helical gear plates is fixedly installed with a telescopic tube. The outer side of each of the two telescopic tubes is sleeved with a first spring. One end of each of the two telescopic tubes is fixedly installed on the top and bottom of the inner side of the rotating frame, respectively.

6. A single-joint resistance-assisted switching muscle training device for patients with inflammatory myopathy according to claim 5, characterized in that, A torsion spring is fixedly installed on the outer side of the fixed tube, and the outer side of the torsion spring is fixedly installed on the inner side of the rotating frame.

7. A single-joint resistance-assisted switching muscle training device for patients with inflammatory myopathy according to claim 6, characterized in that, The rotating assembly includes a side plate, which is fixedly installed on one side of the mounting frame. An outer ring is fixedly installed on one side of the side plate, and a knob is provided on the inner side of the outer ring. A support plate is fixedly installed on the inner side of the knob. A first ratchet is fixedly installed on one side of the support plate, and a second ratchet is engaged on one side of the first ratchet. A support ring is fixedly installed on the inner side of the second ratchet, and one end of the support ring is fixedly installed on one end of the side plate.

8. A single-joint resistance-switching muscle training device for patients with inflammatory myopathy according to claim 7, characterized in that, A square rod is fixedly installed at one end of the threaded sleeve, and a second spring is fixedly installed at one end of the square rod. A sliding cavity is provided inside the knob, and the square rod is slidably connected to the inner side of the sliding cavity. The second spring is disposed on the inner side of the sliding cavity.

9. A single-joint resistance-assisted switching muscle training device for patients with inflammatory myopathy according to claim 1, characterized in that, The connecting component includes an elastic band, with a first Velcro fastener fixedly installed at one end of the outer side of the elastic band and a second Velcro fastener fixedly installed at one end of the inner side of the elastic band.

10. A single-joint resistance-assisted switching muscle training device for patients with inflammatory myopathy according to claim 9, characterized in that, The outer side of the elastic band is covered with multiple sponge sleeves.

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