Knee joint brace

Abstract

The utility model provides a knee joint brace which comprises a thigh binding piece, a shank binding piece and two middle connecting mechanisms arranged on the two sides of the thigh binding piece and the two sides of the shank binding piece respectively. The middle connecting mechanism comprises a fixing unit and two linkage units, and the two linkage units are arranged on the two sides of the fixing unit; wherein the linkage unit is matched with the fixing unit through a limiting constraint part and a track constraint part; when the knee joint brace bends and stretches, the linkage unit moves relative to the fixing unit, the limiting restraining part and the track restraining part jointly restrain the linkage unit to enable the linkage unit to generate composite motion, and therefore the bending and stretching motion of the knee joint is converted into intermittent dynamic stretching between the thigh binding piece and the shank binding piece in the axial direction. And pain can be relieved, and inflammation absorption and tissue repair can be promoted.

Description

Technical Field

[0001] This utility model belongs to the field of knee joint technology, and specifically relates to a knee joint brace. Background Technology

[0002] The knee joint, as the largest and most complex joint in the human body, is highly susceptible to degenerative changes or acute and chronic injuries during daily weight-bearing and exercise, such as osteoarthritis, meniscus tears, and ligament injuries. Patients often experience symptoms such as pain, swelling, and limited range of motion due to narrowing of the joint space, synovitis, and adhesions of surrounding soft tissues. In rehabilitation and sports protection, knee braces are widely used to provide external support, stabilize the joint, and restrict abnormal movements.

[0003] Currently, most knee braces on the market focus on achieving simple flexion and extension movements in their joint hinge design. Although they can simulate the flexion and extension of the knee joint, they cannot actively change the joint space during movement. Utility Model Content

[0004] To address the aforementioned technical problems, this utility model provides a knee joint brace to solve the problems described in the background section.

[0005] This utility model provides the following technical solution: a knee joint brace, including a thigh binding component, a calf binding component, and two intermediate connecting mechanisms respectively disposed on both sides of the thigh binding component and the calf binding component; the intermediate connecting mechanism includes a fixing unit and two linkage units, the two linkage units being disposed on both sides of the fixing unit;

[0006] The linkage unit and the fixed unit cooperate with each other through a limiting constraint part and a trajectory constraint part. When the knee joint brace flexes and extends, the linkage unit moves relative to the fixed unit. The limiting constraint part and the trajectory constraint part jointly constrain the linkage unit, causing it to generate a compound motion. This converts the flexion and extension motion of the knee joint into an intermittent dynamic stretching in the axial direction between the thigh binding and the calf binding. The compound motion is decomposed into: the rotation of the linkage unit relative to the fixed unit, and the displacement of the linkage unit in the direction perpendicular to the fixed unit.

[0007] Compared with existing technologies, the beneficial effects of this invention are as follows: through the coordinated operation of the limiting constraint part and the trajectory constraint part, the passive flexion and extension movements of the knee joint are actively and mechanically converted into axial intermittent stretching of the thigh and calf. This dynamic stretching force can periodically increase the knee joint space during patient walking or rehabilitation training, effectively reducing the pressure and friction between the joint surfaces, creating a better environment for blood circulation and synovial fluid exchange within the joint cavity, thereby helping to relieve pain, promote inflammation absorption, and tissue repair. This is an active therapeutic function that traditional static fixed braces completely lack.

[0008] Furthermore, the limiting constraint part includes a specific surface formed on the fixed unit, a driving end disposed at one end of the linkage unit and in sliding contact with the specific surface, and a connecting end disposed at the other end of the linkage unit, the connecting end being provided with a rotation limiting shaft; when the knee joint brace flexes or extends, the linkage unit rotates around the rotation limiting shaft, and the driving end slides along the specific surface.

[0009] Furthermore, the fixing unit is a limiting block, and the limiting block has specific shaped surfaces on both sides. The two specific shaped surfaces on both sides of the limiting block slide in contact with the driving ends of the two linkage units, and the specific shaped surfaces are inclined surfaces.

[0010] Furthermore, the trajectory constraint part includes a guide member disposed on the linkage unit and a guide groove adapted to the guide member. The guide member extends into the guide groove. When the linkage unit moves, the guide member slides in the guide groove to limit the displacement trajectory of the linkage unit.

[0011] Furthermore, the guide groove is a straight groove.

[0012] Furthermore, the intermediate connection mechanism also includes two mounting base plates, which are spaced apart to form an accommodating cavity for mounting the fixing unit and the linkage unit between the two mounting base plates.

[0013] Furthermore, the intermediate connecting mechanism also includes two moving rods, one end of which is connected to the thigh binding and the calf binding respectively, and the other end of which is connected to the two linkage units respectively.

[0014] Furthermore, the intermediate connecting mechanism also includes an elastic assist component, the two ends of which are respectively connected to two relatively movable parts in the intermediate connecting mechanism, for providing elastic cushioning or assistance during knee flexion and extension. Attached Figure Description

[0015] Figure 1This is a three-dimensional structural diagram of the knee joint brace according to the first embodiment of the present utility model;

[0016] Figure 2 This is a three-dimensional structural diagram of the intermediate connection mechanism in the first embodiment of the present utility model;

[0017] Figure 3 This is a partial three-dimensional structural diagram of the intermediate connection mechanism in the first embodiment of the present utility model;

[0018] Figure 4 This is the first embodiment of the present utility model. Figure 3 A schematic diagram of the structure for disassembling one of the mounting base plates;

[0019] Figure 5 This is the first embodiment of the present utility model. Figure 1 Side view;

[0020] Figure 6 This is the first embodiment of the present utility model. Figure 5 A partial schematic diagram of the bending state of the middle-speed moving rod;

[0021] Figure 7 This is the first embodiment of the present utility model. Figure 6 A partial schematic diagram of the intermediate connecting mechanism in the corresponding state;

[0022] Figure 8 This is a three-dimensional structural diagram of the regulator according to the second embodiment of the present invention;

[0023] Figure 9 This is a three-dimensional structural cross-sectional view of the adjustment mechanism according to the second embodiment of this utility model.

[0024] Key component symbols: 100, thigh binding; 200, calf binding; 300, adjuster; 10, intermediate connecting mechanism; 11, fixing unit; 12, linkage unit; 13, limiting constraint part; 131, specific profile; 132, drive end; 133, rotation limiting shaft; 134, connecting end; 14, trajectory constraint part; 141, guide; 142, guide groove; 15, mounting base plate; 16, accommodating cavity; 17, motion rod; 20, elastic assist component; 21 1. Mounting rod; 22. Elastic rod; 23. First through hole; 30. Limiting component; 31. Second through hole; 40. Adjusting mechanism; 41. Drive unit; 42. Adjusting unit; 421. Internal thread; 422. Guide cavity; 423. Moving cavity; 43. Moving part; 431. Screw; 432. Connecting rod; 433. Limiting ring; 44. Limiting part; 441. First limiting through hole; 442. Second limiting through hole; 50. Size adjusting component; 51. Mounting plate; 52. Inflatable airbag.

[0025] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this utility model. Detailed Implementation

[0026] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. Several embodiments of this utility model are shown in the drawings. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this utility model will be more thorough and complete.

[0027] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0029] Example 1

[0030] Please see Figures 1 to 4 As shown, a knee brace in Embodiment 1 of this utility model includes a thigh binding 100, a lower leg binding 200, and two intermediate connecting mechanisms 10 connected to the left and right sides of the thigh binding 10.

[0031] The intermediate connecting mechanism 10 is the core component for realizing the dynamic stretching function. It mainly comprises:

[0032] Mounting base plate 15: serves as the basic support for the entire mechanism. In this preferred embodiment, the mounting base plate 15 consists of two parallel and spaced-apart plates, thereby forming an accommodating cavity 16 between them.

[0033] Fixing unit 11: It is an approximately trapezoidal limiting block, which is fixedly installed between two mounting base plates 15 by screws or riveting. The limiting block has beveled surfaces on both sides as specific profiles 131.

[0034] Linkage Unit 12: There are two linkage units 12, located on both sides of the fixing unit 11. Importantly, the linkage unit 12 is not an independent component, but is formed by extending one end of the motion rod 17. Specifically, the upper end of one motion rod 17 is connected to the thigh binding 100, and its lower end extends to form the linkage unit 12 located on the upper side of the fixing unit 11; the lower end of the other motion rod 17 is connected to the calf binding 200, and its upper end extends to form the linkage unit 12 located on the lower side of the fixing unit 11.

[0035] The limiting and restraining part 13 includes a specific profile 131 (sloping surface), a driving end 132 disposed at one end of the linkage unit 12, and a rotating connection structure. The driving end 132 can be a smooth protrusion to form a sliding contact with the specific profile 131. The rotating connection structure includes a shaft hole on the connecting end 134 of each linkage unit 12. A rotating limiting shaft 133 passes through the shaft hole and is fixed to the mounting base plates 15 on both sides, so that when the linkage unit 12 rotates, the rotating limiting shaft 133 cooperates with the shaft hole to stop and limit the linkage unit 12, so that the linkage unit 12 moves along the guide groove 142.

[0036] The trajectory constraint part 14 includes a guide groove 142 formed on the mounting base plate 15 and a guide member 141 (guide pin) fixedly mounted on the linkage unit 12. The guide pin passes through the guide groove 142. The guide groove 142 is a straight groove.

[0037] Please see Figures 5 to 7 The working process and principle are shown below:

[0038] When the patient bends their knee, the thigh binding 100 and the lower leg binding 200 rotate relative to each other. This movement is transmitted through two motion rods 17, which drive the two linkage units 12 located on the upper and lower sides of the intermediate connecting mechanism to rotate respectively.

[0039] During the flexion movement:

[0040] The limiting and restraining part plays its role first: the shaft hole of the connecting end 134 of the linkage unit 12 cooperates with the rotation limiting shaft 133 on the mounting base plate 15, which serves as a fulcrum for rotation on the one hand, and generates a blocking and limiting effect when the movement reaches a specific phase on the other hand.

[0041] The trajectory constraint unit provides coordinated guidance: At the same time, the guide member 141 (e.g., guide pin) fixed on the linkage unit 12 slides in the guide groove 142 opened on the mounting base plate 15.

[0042] The combined action of the limiting constraint and the trajectory constraint constrains and guides the linkage unit 12 to generate a specific composite motion trajectory. This trajectory is not a simple rotation around an axis, but includes a displacement perpendicular to the plane of the mounting base plate 15. The direction of this displacement is consistent with the extension direction of the guide groove 142.

[0043] As the knee joint transitions from a flexed to an extended position, the two linked units 12 are driven to rotate in opposite directions. During this extension process:

[0044] The source of action of the limiting constraint changes: the driving end 132 of the linkage unit 12 keeps in contact with the specific surface 131 on the fixed unit (i.e. the limiting block) and slides along it, and the contour of the specific surface 131 at this time becomes the dominant limiting and guiding constraint.

[0045] The trajectory constraint unit continues to guide: the guide member 141 continues to slide in the reverse direction within the guide groove 142.

[0046] Under this coordinated constraint, the linkage unit 12 and its integrated motion rod 17, while rotating, generate a displacement away from the center of the mounting base 15 (i.e., away from the wearer's leg). The ultimate technical effect is that, during knee extension, the motion rod 17 pushes the thigh binding 100 and the calf binding 200 outwards, thereby generating an axial, intermittent dynamic tensile force on the thigh and calf. This force effectively increases the knee joint space. Figure 3 To improve user comfort and provide assistance or cushioning during flexion and extension, an elastic assist component 20 can be added to the intermediate connecting mechanism 10.

[0047] The elastic assist component 20 includes a mounting rod 21 and an elastic rod 22. The mounting rod 21 has a first through hole 23. The elastic rod 22 passes through the first through hole 23 so that its two ends are respectively connected to the upper and lower moving rods 17. When the knee joint is bent, the elastic rod 22 is compressed, storing elastic potential energy and cushioning the bending action; when the knee joint is extended, the elastic rod 22 releases potential energy, assisting in straightening the leg and providing extension assistance.

[0048] It is worth noting that through the ingenious collaborative design of the fixed unit 11, the linkage unit 12, the limiting constraint part 13 and the trajectory constraint part 14, the simple flexion and extension movement is transformed into a dynamic axial stretch with therapeutic significance, which effectively increases the knee joint space.

[0049] Example 2

[0050] Please see Figure 8 and Figure 9As shown, a knee brace is provided in the second embodiment of this utility model. The knee brace of this second embodiment is implemented based on the first embodiment. In order to further improve the individual adaptability of the brace, a knee brace adjuster 300 is integrated on the basis of the above-mentioned intermediate connecting mechanism 10.

[0051] The knee brace adjuster 300 of this embodiment mainly includes two limiting members 30 and an adjustment mechanism 40.

[0052] The adjustment mechanism 40 includes a drive unit 41, two adjustment units 42, and two moving units 43. In this embodiment, the drive unit 41 is a hollow tubular structure that can be rotated by the patient. The two adjustment units 42 are hollow tubular structures, each connected to both ends of the drive unit 41 by a limiting unit 44 (e.g., a limiting pin). Specifically, a first limiting through hole 441 is provided at the ends of the two adjustment units 42, and a second limiting through hole 442 is correspondingly provided at both ends of the drive unit 41. By simultaneously pressing the limiting pin into the first limiting through hole 441 and the second limiting through hole 442, a fixed connection between the drive unit 41 and the two adjustment units 42 can be achieved, allowing the rotation of the drive unit 41 to be synchronously transmitted to the two adjustment units 42.

[0053] Each adjustment section 42 has an internal thread 421 machined on its inner wall. The internal thread 421 divides the inner cavity of the adjustment section 42 into two interconnected areas: a guide cavity 422 with a smooth inner wall near the port, and a moving cavity 423 that accommodates the thread.

[0054] The moving part 43 includes a screw 431 and a connecting rod 432. One end of the connecting rod 432 is fixedly connected to the limiting member 30, and the other end is fixedly connected to the screw 431. The screw 431 and the internal thread 421 in the adjusting part 42 form a threaded transmission pair and are housed in the moving cavity 423. The connecting rod 432 passes through the guide cavity 422, and one end of it is connected to the end of the limiting member 30. The end of the limiting member 30 connected to the connecting rod 432 is adapted to the size of the guide cavity 422 to form a sliding fit, thereby providing stable guidance for the linear movement of the moving part 43 and preventing it from rotating with the screw 431.

[0055] The work process is as follows:

[0056] When the patient rotates the drive unit 41 clockwise or counterclockwise, the rotation is transmitted to the two adjustment units 42 via the limiting unit 44, causing them to rotate synchronously. Since the moving unit 43 is connected to the limiting member 30 via its connecting rod 432, and the limiting member 30 is connected to the mounting rod 21 on the mounting base plate 15 of the knee brace, the limiting member 30 has a second through hole 31. The elastic rod 22 passes through the first through hole 23 and the second through hole 31 in sequence, fixing the limiting member 30, which is sleeved on the mounting rod 21, to the mounting rod 21. At this time, the rotational movement of the adjustment unit 42 is converted into the linear movement of the two moving units 43 through the engagement of its internal thread 421 with the screw 431. The threads in the two adjustment units 42 are set to opposite directions. For example, the left adjustment unit 42 has a left-hand thread, and the right adjustment unit 42 has a right-hand thread. Therefore, when the drive unit 41 rotates in one direction (e.g., clockwise), the two moving parts 43 move inward (towards each other) synchronously, causing the two limiting members 30 to move closer together, thereby reducing the support radius of the adjuster 300 to accommodate thinner legs. Conversely, when the drive unit 41 rotates in the opposite direction (e.g., counterclockwise), the two moving parts 43 move outward (backwards) synchronously, causing the two limiting members 30 to separate, thereby expanding the support radius of the adjuster 300 to accommodate thicker legs. This design enables precise and efficient bilateral symmetrical adjustment with a single hand operation.

[0057] To further optimize reliability, a limiting ring 433 is provided extending from the end of the screw 431 away from the connecting rod 432. Simultaneously, a step is formed within the moving cavity 423 at the junction with the internal thread 421.

[0058] The outer diameter of the limiting ring 433 is designed to be larger than the inner diameter at the step. This means that when the moving part 43 moves outward to its limit position, the limiting ring 433 will abut against the step, thereby preventing the moving part 43 from moving further and completely disengaging from the adjusting part 42, thus playing a crucial role in mechanical limiting and safety protection. Simultaneously, the precise fit between the outer diameter of the limiting ring 433 and the inner diameter of the moving cavity 423 provides auxiliary guidance during the movement of the moving part 43, enhancing motion stability.

[0059] To achieve final fine-tuning of the leg contour and further improve wearing comfort, in a preferred embodiment of this invention, a size adjustment member 50 is provided on the inner side (i.e., the side closest to the leg) of the mounting base 15 of the knee brace. The size adjustment member 50 can be flexibly configured. It can be provided only on one side of the mounting base 15, or on both sides of the mounting base 15, to adapt to different clinical needs and patient preferences.

[0060] Combination Figure 1 , Figure 5 and Figure 6The size adjustment component 50 includes a mounting plate 51 fixedly mounted on the inner side of the mounting base plate 15, and an inflatable airbag 52 connected to the mounting plate 51 by Velcro (including hook side and loop side). The airbag can be inflated or deflated by an additional miniature air pump or manual air valve (not shown in the figure).

[0061] It is worth noting that when airbags are installed on both sides, symmetrical inflation can evenly fill the gap between the brace and the legs, making the pressure distribution more even, avoiding excessive local pressure, and significantly improving comfort and fixation stability.

[0062] When the size adjustment component 50 is installed on only one side of the base plate 15, asymmetrical targeted compression can be applied to one side of the thigh and calf joint by inflating its airbag. At this time, since the thigh binding component 100 and the calf binding component 200 have already firmly fixed the limb, this unilateral compression force is transmitted to the knee joint, forming a slight internal torque, thereby passively changing the gap between the medial and lateral sides of the knee joint. This function is particularly beneficial for patients with osteoarthritis and uneven joint gaps (such as O-shaped legs and X-shaped legs), enabling targeted decompression and force line adjustment.

[0063] In summary, the implementation process of the knee joint brace in the above two embodiments of this utility model is as follows:

[0064] Step 1: Static Precision Adaptation (Solving Adaptability Issues);

[0065] After the patient puts on the brace, they first rotate the drive unit 41 of the brace adjuster 300. Through the internal opposing spiral drive, the two adjusters 300 synchronously drive the left and right limiting members 30 to move towards or away from each other, achieving stepless, synchronous, and precise adjustment of the support radius. This process ensures that the overall brace achieves an individualized and precise fit with the patient's leg contour, providing a stable mechanical basis for subsequent dynamic functions and fundamentally avoiding poor blood circulation due to excessive tightness and unstable fixation due to excessive looseness.

[0066] Step 2: Dynamic active treatment (to address the problem of single function);

[0067] The dynamic stretching intermediate connection mechanism 10 automatically starts when the patient begins to walk or perform rehabilitation training.

[0068] The flexion and extension movements of the knee joint are transmitted to the linkage unit 12 via the motion rod 17.

[0069] Under the coordinated guidance of the limiting constraint part 13 (such as an inclined plane) and the trajectory constraint part 14 (such as a guide groove 142 and a pin), the linkage unit 12 generates a composite motion that includes vertical displacement.

[0070] At the end of knee extension, the mechanism forces the thigh and calf straps 200 to produce an axial, intermittent dynamic stretch.

[0071] This stretching force acts directly on the knee joint, effectively increasing the joint space between the medial and lateral sides and reducing pressure and friction between the joint surfaces. This achieves a proactive intervention and therapeutic function on the internal biomechanical environment of the joint, a function that traditional braces do not possess.

[0072] Step 3: Final comfort fine-tuning (improving comfort);

[0073] For particularly sensitive patients or areas requiring localized decompression, final fine-tuning can be achieved using the airbag-type size adjustment element 50. Manual control of the airbag's inflation volume allows for localized filling of the gap between the brace and the leg, achieving even pressure distribution and personalized support.

[0074] In summary, this utility model has achieved the following groundbreaking and beneficial effects:

[0075] 1. The innovative adjuster 300 enables stepless, synchronous static coarse adjustment of the brace's support radius, allowing it to quickly adapt to different leg sizes, from slender to robust, solving the problem of traditional braces being too tight or too loose due to limited adjustment range. Simultaneously, the innovative intermediate connecting mechanism 10 automatically and in real-time converts passive flexion and extension movements of the knee joint into intermittent dynamic axial stretching of the joint, achieving active joint decompression during activity. This transforms the brace from a passive, fixed support device into an active rehabilitation therapy device.

[0076] 2. The dynamic stretching function periodically pulls on the knee joint during walking or training, increasing the joint space and reducing pressure and friction between the joint surfaces. This effectively relieves pain caused by osteoarthritis, meniscus injuries, etc. Intermittent dynamic stretching helps promote the circulation and diffusion of synovial fluid, improves cartilage nutrition, and helps loosen adhesions in soft tissues, creating a more favorable physiological environment for the repair of internal joint tissues. The dynamic stretching function is triggered entirely by the patient's natural gait, requiring no additional operation or energy, achieving a seamless and automated rehabilitation experience of "walking as therapy," greatly improving patient compliance.

[0077] 3. Through the coordinated action of the limiting restraint part 13 and the trajectory restraint part 14, the passive flexion and extension movements of the knee joint are actively and mechanically converted into intermittent axial stretching of the thigh and calf. This dynamic stretching force can periodically increase the knee joint space during the patient's walking or rehabilitation training, effectively reducing the pressure and friction between the joint surfaces, creating a better environment for blood circulation and synovial fluid exchange within the joint cavity, thereby helping to relieve pain, promote inflammation absorption, and tissue repair. This is an active therapeutic function that traditional static fixed braces completely lack.

[0078] 4. Because the adjustment is based on stepless transmission using a mechanical structure, very precise control of tension and stroke can be achieved. Different ranges of motion (flexion and extension angles) of the patient correspond to different amounts of tension, achieving a "personalized" dynamic fit that matches the individual's movement state. This solves the problem of traditional braces relying on straps for static adjustment, which makes it difficult to accurately control pressure and easily leads to excessive tightness or looseness.

[0079] 5. Through the dual constraints of the specific surface 131, the guide groove 142, and the guide member 141, the motion trajectory of the linkage unit 12 is a pre-designed composite motion. This ensures the smoothness, stability, and predictability of the stretching action, eliminates the possibility of motion jamming or abnormal trajectory, and guarantees the safety of use and the reliability of the mechanism.

[0080] 6. The entire linkage mechanism can be integrated into a compact accommodating cavity 16, and its appearance is similar to that of a traditional brace hinge, so it does not appear bulky. Its drive relies entirely on the movement of the human body, requiring no external energy or complex operation. After wearing it, patients can automatically enjoy the benefits of dynamic stretching during normal activities, making the patient experience very user-friendly.

[0081] 7. Through the adjustment mechanism 40, which consists of a drive unit 41, an adjustment unit 42, and a moving unit 43, the patient can easily move the two moving units 43 synchronously and smoothly within the adjustment unit 42 by simply operating the drive unit 41. This transmission method achieves stepless adjustment and can precisely control the distance between the two limiting members 30, thereby allowing the support radius of the brace to be continuously and precisely changed. This overcomes the shortcomings of traditional snap-on or hole-type adjustment methods, which have limited range and poor precision, and truly achieves individualized and precise fitting.

[0082] 8. By using the opposite threads within the two adjusting parts 42, it is ensured that when the drive part 41 rotates in one direction, the two moving parts 43 and the limiting member 30 connected to them can move synchronously towards or away from each other. This symmetrical adjustment mechanism ensures that both sides of the brace always apply uniform pressure to the legs, effectively avoiding problems such as brace displacement, rotation, or instability caused by unilateral adjustment or uneven force, and greatly improving the stability and fixation effect of the brace.

[0083] 9. By incorporating size adjustment components 50 (particularly the inflatable airbag 52) on the brace, an independent and flexible fine-tuning dimension is added. After the main body radius is adapted via the adjuster 300, the patient can adjust the air pressure within the airbag to subtly compensate for local pressure, further adapting to changes in the contours of the leg muscles. This combination of "rigid main adjustment + flexible fine-tuning" effectively disperses local pressure, greatly improving wearing comfort and completely avoiding problems of poor blood circulation caused by an overly tight brace.

[0084] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0085] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A knee brace, characterized in that, The knee joint brace comprises a thigh binding member, a lower leg binding member, and two intermediate connecting mechanisms respectively arranged on two sides of the thigh binding member and the lower leg binding member. The intermediate connecting mechanism comprises a fixed unit and two linkage units arranged on two sides of the fixed unit.

2. The knee brace of claim 1, wherein, The linkage unit and the fixed unit are matched through a limiting constraint part and a trajectory constraint part.

3. The knee brace of claim 2, wherein, When the knee joint brace is bent and stretched, the linkage unit moves relative to the fixed unit, and the limiting constraint part and the trajectory constraint part jointly constrain the linkage unit to generate a compound motion, thereby converting the bending and stretching motion of the knee joint into intermittent dynamic stretching in the axial direction between the thigh binding member and the lower leg binding member.

4. The knee brace of claim 2, wherein, The limiting constraint part comprises a specific profile formed on the fixed unit, a driving end arranged on one end of the linkage unit and in sliding contact with the specific profile, and a connecting end arranged on the other end of the linkage unit and provided with a rotation limiting shaft.

5. The knee brace of claim 4, wherein, The fixed unit is a limiting block, and the limiting block is provided with the specific profile on both sides.

6. The knee brace of claim 1, wherein, When the knee joint brace is bent, the motion of the linkage unit is jointly constrained by the trajectory constraint part and the rotation limiting shaft.

7. The knee brace of claim 1, wherein, When the knee joint brace is stretched, the motion of the linkage unit is jointly constrained by the trajectory constraint part and the specific profile.

8. The knee brace of claim 1, wherein, The trajectory constraint part comprises a guide arranged on the linkage unit and a guide groove matched with the guide. The guide is slidably arranged in the guide groove. When the linkage unit moves, the guide slides in the guide groove to limit the displacement trajectory of the linkage unit. The guide groove is a straight groove. The intermediate connecting mechanism further comprises two mounting base plates. The two mounting base plates are arranged in a spaced manner to form a receiving cavity between the two mounting base plates for mounting the fixed unit and the linkage unit. The intermediate connecting mechanism further comprises two motion rods. One end of each of the two motion rods is connected to the thigh binding member and the lower leg binding member, respectively. The other end of each of the two motion rods is connected to the two linkage units, respectively. The intermediate connecting mechanism further comprises an elastic power assisting assembly. Two ends of the elastic power assisting assembly are connected to two relatively movable parts of the intermediate connecting mechanism, respectively, for providing elastic buffering or power assistance when the knee joint is bent and stretched.

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