A medical assisted care device

Abstract

This invention discloses a medical assistive nursing device, relating to the field of knee joint orthotic nursing devices, aiming to solve the technical problem that conventional knee joint orthotic braces are not suitable for postoperative and long-term rehabilitation of patients with osteoarthritis. The invention includes articulated joint correction sections, a joint cover, an arc-shaped connecting plate, and a sliding auxiliary fork plate. The fork plate has a first auxiliary structure; when standing, the pressure-sensitive layer is open, and the expansion part engages to form vertical support, reducing joint load. An internal sac-like buffer component can distinguish between momentary knee flexion and prolonged standing, preventing accidental locking during walking. The wedge-shaped inclined surface of the fork plate provides full-length contact to prevent local pressure injuries. An external lever-based force-saving mechanism, combined with a power-storing spring, stores energy in segments through a circulation chamber and spring-loaded protrusions, releasing amplified traction force at the inflection point, making walking easier for patients with myasthenia gravis. The device combines standing load reduction, accidental activation prevention, stable fit, and walking assistance functions, making it suitable for rehabilitation wear by people with knee arthritis and ligament surgery.

Description

Technical Field

[0001] This invention relates to the field of knee joint orthopedic care devices, and more specifically, to a medical auxiliary care device. Background Technology

[0002] Individuals with knee osteoarthritis, meniscus tears, or who have undergone cruciate ligament reconstruction, as well as those with lower limb muscle atrophy or neurogenic lower limb weakness, often experience cartilage wear, insufficient ligament tension, and impaired leg muscle function. This results in a significant decrease in the joint's weight-bearing and dynamic stability. During daily walking and standing rehabilitation, knee braces are necessary to restrain abnormal varus and valgus deformities, help maintain normal alignment, and reduce direct stress on the joint. Currently, conventional knee braces on the market rely solely on straps and soft padding for basic coverage and correction, only simply limiting significant joint displacement. They lack an effective rigid support system for upright, static standing conditions, presenting significant limitations.

[0003] From the perspective of the root causes of the defects, traditional orthotic braces lack mechanical limiting mechanisms that automatically engage with the standing posture. They rely solely on elastic webbing and sponge padding for wrapping and fitting, and the elastic materials can only provide weak lateral restraint, failing to form a vertical rigid load-bearing structure. When standing, the weight of the upper body and legs is continuously transmitted downwards, and all the load is still concentrated on the damaged knee cartilage and ligaments, with the brace unable to share the vertical pressure. At the same time, traditional products lack posture recognition and cushioning structures, failing to distinguish between continuous standing and momentary knee flexion and stepping, only maintaining soft restraint throughout, and lacking targeted load-reducing functions.

[0004] This structural defect can lead to multiple adverse consequences: When patients stand for long periods, the damaged articular cartilage, meniscus, and ligaments are subjected to continuous high-intensity static compression, which can cause discomfort such as knee soreness, weakness, and muscle fatigue in a short time; long-term high static load will accelerate further wear and tear on the articular cartilage, stimulate the synovium to secrete a large amount of joint effusion, and aggravate joint swelling and pain symptoms; for patients in the postoperative recovery period, continuous overload compression can easily lead to traction damage to the repaired ligaments and meniscus, causing secondary lesions and significantly prolonging the overall rehabilitation period; at the same time, continuous leg fatigue will limit the duration of patients' standing rehabilitation training, which is not conducive to lower limb muscle strength recovery training and seriously affects the overall rehabilitation effect.

[0005] In summary, existing conventional knee braces cannot provide stable and controllable rigid support while standing, and cannot effectively distribute the vertical load on the joint, easily causing standing fatigue and secondary joint damage, which is not conducive to postoperative and long-term rehabilitation for patients with osteoarthritis. Therefore, we propose a medical assistive care device. Summary of the Invention

[0006] The purpose of this invention is to provide a medical assistive nursing device to solve the technical problem that conventional knee joint orthotic braces are not suitable for postoperative and long-term rehabilitation of patients with osteoarthritis.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a medical auxiliary nursing device, comprising: The joint correction upper section and the joint correction lower section are rotatably connected; A joint cover is disposed at the rotatable connection between the upper joint correction section and the lower joint correction section, and is movably connected to the upper joint correction section and the lower joint correction section; An auxiliary fork plate is linked to the joint cover and slides along an arc-shaped trajectory under constraint; elastic straps are connected to both sides of the joint cover. A first auxiliary structure, which is disposed on the auxiliary fork plate, includes a sensing end and an execution end; in the standing posture, the sensing end is triggered as the auxiliary fork plate slides, causing the execution end to switch from a contracted state to an expanded state; The support plate has multiple grooved and sawtooth structures, which are fixed in position and located adjacent to the execution end; when the execution end switches to the expanded state, the two interlock to form a rigid engagement that prevents the auxiliary fork plate from sliding.

[0008] Preferably, the sensing end includes a pressure-sensitive layer and a drive link. The pressure-sensitive layer is fixed to the auxiliary fork plate. One end of the drive link moves with the lower joint correction section, and the other end is detachably in contact with the pressure-sensitive layer to conduct or disconnect the circuit with the execution end. The drive link has a bending arc. When the lower joint correction section bends slightly, it can drive one end of the drive link to completely separate from the pressure-sensitive layer.

[0009] Preferably, the execution end includes a conductive strip connected to the sensing end circuit, and an expansion portion that contacts the conductive strip and is fixed to the auxiliary fork plate; when the circuit is turned on, the expansion portion is energized and expands from a contracted state to an expanded state.

[0010] Preferably, it further includes a buffer assembly disposed on the auxiliary fork plate. The buffer assembly includes a bladder with an air port. One end of the bladder is fixed relative to the auxiliary fork plate, and the other end is linked with the drive link. When the drive link is subjected to instantaneous compression, the bladder cannot be compressed quickly due to the air exhaust resistance of its air port, so as to prevent the drive link from contacting the pressure-sensitive layer.

[0011] Preferably, the buffer assembly includes a fixed ring fixed to the auxiliary fork plate and a movable ring fixed to the drive linkage, with one end of the bladder body connected to the fixed ring and the other end connected to the movable ring.

[0012] Preferably, it further includes a second auxiliary structure, which includes a force-saving rod hinged to a fixed position and a tension spring; one end of the force-saving rod is linked to the auxiliary fork plate, and the other end is movably connected to one end of the tension spring; the other end of the tension spring is movably connected to the lower joint correction section; the force-saving rod is used to amplify the displacement of the auxiliary fork plate and act on the tension spring to provide knee flexion assistance.

[0013] Preferably, the hinge point of the force-saving bar is close to the end that is linked with the auxiliary fork plate, so that it forms an unequal lever arm; the connection points of the two ends of the tension spring on the lower section of the joint correction and the force-saving bar are arranged vertically and vertically, so that the tension spring is only stretched when the knee is bent.

[0014] Preferably, the tension spring includes two oppositely arranged end contacts, an elastic sheet connected between the two end contacts, and a one-way locking mechanism disposed inside; the one-way locking mechanism is used to lock the elastic force generated by the tension spring when it is stretched, and to release it when stretched to a predetermined position, so as to concentrate the output traction force.

[0015] Preferably, the one-way locking mechanism includes a plug rotatably connected to one of the end contacts and a fixed tube fixed to the other end contact and inserted into the plug. The outer wall of the plug has a circulation cavity. The inner wall of the fixed tube is integrally formed with a convex ball that cooperates with the circulation cavity. The circulation cavity is provided with a one-way blocking structure that allows the convex ball to pass through in one direction and locks its return.

[0016] Preferably, the circulation cavity is composed of alternating straight sliding sections and inclined sections; the one-way locking structure consists of multiple spring-loaded protrusions located on the straight sliding section; the convex ball is locked after sliding unidirectionally through the circulation cavity past the spring-loaded protrusions, and the lock is released when it slides into the inclined section.

[0017] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention relies on the linkage of the pressure-sensitive layer, conductive strip, and expansion part. When the human body stands upright, the joint cover drives the auxiliary fork plate to slide, the pressure-sensitive layer presses against the conductive circuit, and the expansion part expands and embeds into the serrated groove of the support plate to form a rigid limiting support. It can directly share the vertical self-weight load of the human body and significantly reduce the static compression pressure on the damaged knee cartilage and ligaments. Unlike traditional braces that rely solely on soft restraint with straps, this structure can form a stable vertical load-bearing structure, reducing the problems of soreness, weakness, and fatigue caused by continuous pressure on the joint during long periods of standing. At the same time, the drive linkage adopts a lever-type bending arc design, which can quickly disconnect the circuit and release the lock with only a slight knee flexion. The unlocking resistance is small and will not pull on the soft tissue of the affected area. It solves the defects of traditional braces that lack rigid support when standing, aggravate cartilage wear, effusion hyperplasia, and secondary postoperative damage due to prolonged standing. It is suitable for long-term standing rehabilitation for people with osteoarthritis and ligament surgery.

[0018] 2. This invention incorporates a bladder-like buffer assembly inside the auxiliary fork plate. The moving ring moves synchronously with the drive linkage. Relying on the gas inside the bladder and the airflow resistance at the air outlet, a delayed buffering mechanism is formed, enabling automatic differentiation of working conditions. During normal walking with slight knee flexion and instantaneous knee expansion and compression, the brief impact cannot quickly expel the gas inside the bladder. The bladder continuously blocks the drive linkage from pressing the pressure-sensitive layer, preventing the conductive circuit from being completed and the expansion part from accidentally locking, thus avoiding hard obstruction and gait breakage during walking. Only during prolonged standing can slow compression gradually expel gas and fully connect the support structure. This structure solves the problem of accidental activation on the basis of the standing load reduction function. It does not require manual mode switching and automatically adapts to both standing and walking conditions, preventing accidental locking and traction on ligament repair, balancing standing load reduction and walking activity smoothness, and improving the comfort of wearing rehabilitation.

[0019] 3. The auxiliary fork plate of this invention has a wedge-shaped inclined surface near the support plate that adapts to the flexion and extension displacement of the joint. Throughout the bending and straightening process of the joint, the support plate is always in close contact with the wedge-shaped inclined surface without any slippage gap. Traditional braces often have flat end faces for their moving components, which are prone to misalignment after repeated flexion and extension, causing local single-point high pressure on the knee soft tissue, and also causing the conductive sensing components to shift, exacerbating the problem of false triggering. This wedge-shaped fitting structure disperses the local stress when the support is engaged, avoiding local pressure redness and dermatitis. At the same time, it stabilizes the contact position between the pressure-sensitive layer and the bending plate, ensuring long-term accurate posture recognition sensing. Based on the aforementioned standing support and prevention of false triggering, the overall structural stability is optimized, and the corrective force line will not be skewed with joint movement, avoiding the aggravation of deformity, and taking into account both wearing comfort and structural durability.

[0020] 4. This invention adds a force-saving lever assist mechanism, with the hinge fulcrum on the bending plate as the pivot. The force-saving lever is longer on the side closer to the auxiliary fork plate, amplifying the small displacement of the joint by lever. The tension spring adopts a staggered hinge layout, so that only tension is generated when the joint bends, and lateral compression will not cause premature failure. When walking with knee flexion, the joint cover pushes the auxiliary fork plate to slide, pulling the force-saving lever tension spring. The spring pulls the lower section of the joint in the opposite direction to actively assist bending. This reduces the need for voluntary force exertion for elderly people with muscle atrophy and postoperative muscle weakness. In addition to the aforementioned stable standing support and smooth walking, this structure adds a dynamic walking assistance function, forming a dual mode of "standing burden reduction and walking assistance". This solves the shortcomings of traditional braces that can only fix and cannot assist in knee flexion walking, expanding the applicable scenarios for rehabilitation.

[0021] 5. This invention innovatively designs a power-storing tension spring with a circulation cavity, a spring-loaded protrusion, and a convex ball. Unlike ordinary springs that rebound immediately upon stretching and provide weak assistance, when the knee is flexed and stretched, the convex ball slides along the inclined plane past the spring-loaded protrusion and completes elastic energy storage. After passing the protrusion, the stored energy is locked on the straight surface and not released. When the leg is extended to the inflection point, the limit is released, and all elastic potential energy is released at once, amplifying the output traction force to assist the leg in straightening. Based on the lever-assisted walking structure, the elastic force output intensity is further improved. The power-storing and locking mechanism avoids the dispersion and loss of elastic force, significantly reducing the physical exertion of patients with myasthenia gravis throughout the walking process and extending the rehabilitation walking time. The multiple elastic plates on the outer periphery of the spring, combined with the central tenon limiting structure, are resistant to bending and fatigue aging, balancing the assistance strength and the long-term durability of the equipment, and comprehensively improving the rehabilitation and nursing effect. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the auxiliary part in this invention; Figure 3 This is a schematic diagram of the connection structure of the auxiliary fork plate in this invention; Figure 4 This is a schematic diagram of the connection structure of the drive linkage in this invention; Figure 5 This is a schematic diagram of the connection structure between the second auxiliary structure and the auxiliary fork plate in this invention; Figure 6 This is a schematic diagram of the structure of the novel tension spring in this invention; Figure 7 This is a schematic diagram of the internal structure of the novel tension spring in this invention; Figure 8 This is a schematic diagram of a half-section of the novel tension spring of the present invention; Figure 9 This is a schematic diagram of the circulation cavity in this invention; Figure 10 This is a schematic diagram of the structure of the fixed tube in this invention.

[0023] Explanation of the labels in the diagram: 1. Upper joint correction section; 2. Lower joint correction section; 3. Fixation part; 4. Joint cover; 5. Spring connecting band; 6. Extension plate; 7. Bending connecting plate; 8. Restraint frame; 9. Auxiliary fork plate; 10. First auxiliary structure; 11. Second auxiliary structure; 101. Pressure-sensitive layer; 102. Drive connecting rod; 103. Conductive strip; 104. Expansion part; 105. Support plate; 106. Fixing ring; 107. Capsule; 108. Moving ring; 111. Hinge fulcrum; 112. Force-saving rod; 12. Tension spring; 121. End joint; 122. Elastic sheet; 123. Fixing tube; 124. Insert post; 125. Circulation chamber; 1251. Straight sliding section; 1252. Inclined section; 126. Spring-loaded protrusion; 127. Protruding ball. Detailed Implementation

[0024] like Figures 1 to 10 As shown, the present invention relates to a medical assistive nursing device, comprising an upper joint correction section 1 and a lower joint correction section 2, which are rotatably connected. A fixing part 3 is connected to the back of both the upper and lower joint correction sections 1 and 2. The fixing part 3 can be a fastener such as Velcro or a snap-on structure. A joint cover 4 is provided at the center of the rotatable connection point between the upper and lower joint correction sections 1 and 2, located at the joint position. Multiple elastic straps 5 are connected to both sides of the joint cover 4 and the upper and lower joint correction sections 1 and 2, respectively. The elastic straps 5 are made of elastic material. To facilitate bending and ensure that the spring-loaded link 5 remains in the joint position, both sides of the upper joint correction section 1 and the lower joint correction section 2 are connected to extension plates 6. One side of the extension plate 6 connected to the upper joint correction section 1 is connected to a curved connecting plate 7. The curved connecting plate 7 is a fan-shaped curved arc centered on the rotation connection point. The inner arc side of the curved connecting plate 7 is connected to a constraint frame 8. The upper limit of the constraint frame 8 is slidably connected to an auxiliary fork plate 9. One end of the auxiliary fork plate 9 is slidably connected to the joint cover 4. The auxiliary fork plate 9 slides along the constraint frame 8 to follow the joint flexion and extension, avoiding motion interference.

[0025] The auxiliary fork plate 9 is provided with a first auxiliary structure 10, which includes a pressure-sensitive layer 101. The pressure-sensitive layer 101 is embedded in one side of the auxiliary fork plate 9. The pressure-sensitive layer 101 is made of a pressure-sensitive material and can be pressed tightly against one side of the bending connecting plate 7. A drive connecting rod 102 is provided on one side of the pressure-sensitive layer 101. When the joint is upright, one end of the drive connecting rod 102 contacts the pressure-sensitive layer 101. The drive connecting rod 102 passes through the auxiliary fork plate 9 and one end is rotatably connected to the lower joint correction section 2. When the joint is bent, the lower joint correction section 2 moves, which can drive the drive connecting rod 102 to move and separate from the pressure-sensitive layer 101. At least one conductive strip 103 is connected to the outer periphery of the drive connecting rod 102. In this embodiment, two conductive strips are used. The conductive strips 103 are made of a woven material to ensure that they can be energized and bent. One side of the conductive strip 103 contacts a component built into the auxiliary fork plate 7. The expansion part 104 inside the plate 9 is made of an electrically expandable material. A support plate 105 connected to the extension plate 6 is provided on one side of the expansion part 104. One side of the support plate 105 is in contact with the expansion part 104. Multiple serrated grooves are opened on the side of the support plate 105 in contact with the expansion part 104. When the expansion part 104 is energized, it will expand. The expanded part of the expansion part 104 enters the serrated groove, which can complete the engagement. Thus, in the case of standing upright, the engagement limit can be achieved, reducing the need for standing. Furthermore, in order to avoid separation difficulties, the drive link 102 has an appropriate bending arc. When the joint bends, the slight bending before the preparation can drive the drive link 102 to a sufficient separation distance, similar to the lever principle. This avoids excessive resistance during separation. The above-mentioned parts in contact with the skin can be insulated.

[0026] The pressure-sensitive layer 101 is made primarily of medical-grade flexible piezoresistive conductive silicone rubber. The silicone rubber substrate is composited with nano-carbon black conductive filler, ensuring biocompatibility and long-term adhesion to the device's interior without irritation. With a thickness of 0.2~0.5mm, it can be die-cut and embedded into the groove of the auxiliary fork plate 9. When no pressure is applied, the internal conductive particles separate, resulting in overall insulation and circuit breaking. Under pressure, the filler overlaps with the bent connecting plate 7, forming a conductive path and connecting the conductive strip 103 circuit. Insulation is immediately restored upon release of pressure, with a millisecond-level response speed, suitable for rapid switching between standing and squatting scenarios. Its high elasticity allows for repeated bending hundreds of thousands of times without failure, resisting slight friction within the brace without producing metal debris or short-circuit risks. With a hardness of Shore A25, it fits the curved connecting plate 7 without sharp edges, ensuring no abnormal noise during long-term wear and meeting medical device safety standards.

[0027] The expansion part 104 is preferably a low-voltage dielectric elastomer DEA (electro-expanding elastic polymer, medical grade), which is composed of: a cross-linked soft silicone rubber dielectric elastomer film, double-sided printed flexible conductive silver paste electrodes, integrally molded without rigid parts, and can be driven to deform and expand with low voltage (24V safe DC); after being energized, electrostatic extrusion generates lateral expansion, with an expansion amount of 15% to 30%, and the protrusion is embedded into the serrated groove of the support plate 105 to achieve engagement; after the power is cut off, the elasticity automatically and quickly contracts, completely disengaging from the serrated groove, and the deformation is reversible and leaves no residue. It can deform and repeatedly expand and contract without plastic deformation; the driving voltage is a safe low voltage for the human body, and there is almost no heat generation during operation, so it will not burn the instrument or the human body; the soft texture can be softly engaged with the 105 tooth grooves of the support plate without generating rigid impact noise; it is resistant to bending and aging, and will not harden after long-term wear; it can be integrally injection molded into the cavity of the auxiliary fork plate 9, which can be adapted to narrow internal structures; medical electroactive PVC gel can also be selected, which has a greater expansion force and is suitable for heavy-duty knee joint braces that require strong clamping and limiting. The disadvantage is that it generates a little heat and a small heat dissipation cavity needs to be reserved.

[0028] Working principle: When the human body switches from a sitting to a standing posture, the legs straighten and the joints open. The joint cover 4 moves outward in sync, pulling the auxiliary fork plate 9 to slide along the arc of the constraint frame 8. This causes the pressure-sensitive layer 101 to continuously press against the inner side of the bending connecting plate 7 to form a complete conductive circuit. At the same time, the lower joint correction section 2 drives the drive connecting rod 102 to move in sync. The end of the drive connecting rod 102 remains in close contact with the pressure-sensitive layer 101. Current is transmitted to the expansion part 104 through the conductive strip 103. The expansion part 104 expands and protrudes when energized. The protruding structure is embedded in the sawtooth groove of the support plate 105 to form a mechanical engagement, which generates a limiting constraint force on the auxiliary fork plate 9 and the bending connecting plate 7. The whole provides rigid support for the legs and reduces knee joint fatigue when standing.

[0029] When the human body switches between walking and squatting postures, the joints undergo slight bending. Relying on the pre-set bending arc of the drive link 102 to form a lever transmission structure, a slight rotation of the lower section can drive the drive link 102 to quickly disengage from the pressure-sensitive layer 101. The conductive circuit is instantly disconnected, the expansion part 104 loses power and contracts, and the locking constraint with the serrated groove of the support plate 105 is released. There is no additional resistance to hinder the bending movement of the joint. At the same time, the spring link 5 continuously provides a weak rebound force to ensure that the joint cover 4 and the auxiliary fork plate 9 are reset, preparing for the next standing limit action. A slight bend is enough to unlock, avoiding excessive locking and separation resistance that may cause leg pulling discomfort.

[0030] Furthermore, the aforementioned expansion of the expansion section 104 via electricity achieves locking and provides support when standing. However, during normal walking, the support plate 105 may be squeezed. Although the contact time is short, accidental contact may still occur. To address this, a buffer component is designed. A fixing ring 106 is installed inside the auxiliary fork plate 9. A bladder 107 is connected to one side of the fixing ring 106, and a moving ring 108 is fixed to one side of the bladder 107. The inner ring of the moving ring 108 is fixed to the outer circumference of the drive rod 102. An air port is installed on the bladder 107. This function is that when walking, the brief compression will be limited by the air release from the bladder 107, providing a buffer time for the contact between the drive rod 102 and the pressure-sensitive layer 101, ensuring that no resistance occurs during normal walking.

[0031] Working principle: When the human body walks normally and makes slight knee flexion movements, the knee joint only experiences brief and momentary small compression. The drive link 102 will momentarily move slightly towards the pressure-sensitive layer 101 and compress the bladder 107. Due to airflow resistance at the air outlet, the brief compression cannot quickly expel the gas inside the bladder. The bladder 107 relies on the internal gas support to form a buffer barrier, limiting the drive link 102 from fully compressing the pressure-sensitive layer 101. The conductive circuit cannot be established, and the expansion part 104 will not be energized to expand and engage, effectively avoiding false triggering caused by momentary compression during walking and preventing additional engagement resistance during joint movement. When the knee flexion range continues to increase and the movement transitions to a squatting motion, the drive link 102 moves significantly away from the pressure-sensitive layer 101, and the bladder 107 returns to its original position due to its own elasticity. External air is replenished into the bladder 107 through the air outlet, restoring the initial buffering shape and preparing for the buffer limit of the next standing movement.

[0032] Furthermore, to improve stability, the auxiliary fork plate 9 is designed with a wedge shape on the side near the support plate 105, and the fitting inclined surface is adapted to the displacement distance generated when the upper joint correction section 1 and the lower joint correction section 2 bend, so that the support plate 105 and the wedge-shaped inclined surface always maintain a close contact state, which greatly improves the stability during use.

[0033] Furthermore, while the above provides improved support for standing, it lacks an auxiliary mechanism for patients with joint injuries or weakness during walking. To address this, a second auxiliary structure 11 is provided on the outer periphery of the auxiliary fork plate 9. This second auxiliary structure 11 includes a hinged fulcrum 111 connected to the curved connecting plate 7. A force-saving rod 112 is hinged to the hinged fulcrum 111. One end of the force-saving rod 112 is movably connected to the outer periphery of the auxiliary fork plate 9, and the other end is movably connected to a tension spring 12. The end of the tension spring 12 away from the force-saving rod 112 is movably connected to the extension plate 6 on the lower joint correction section 2. It should be noted that the two ends of the tension spring 12 are movably connected... The connection points are also carefully designed. The movable connection point between the tension spring 12 and the extension plate 6 is in an upward position, and the movable connection point between the tension spring 12 and the force-saving rod 112 is in a downward position. Thus, when the upper section 1 and the lower section 2 of the joint correction bend, an upward and downward pulling force is generated, which prevents the tension spring 12 from being compressed near the force-saving rod 112 when the lower section 2 of the joint correction rotates, ensuring the extension distance of the tension spring 12. The length of the hinge point of the force-saving rod 112 near the auxiliary fork plate 9 is greater than the length of the other end. Thus, when the equipment bends, the movement of the joint cover 4 drives the movement of the auxiliary fork plate 9. With the help of the lever principle, a force-saving drive is achieved with a smaller force.

[0034] Working principle: When the knee joint bends and the body takes a step, the joint is pushed outward by the force, causing the joint cover 4 to move away from the bending connecting plate 7 along an arc trajectory. Simultaneously, this causes the auxiliary fork plate 9, which is limited and mounted on the constraint frame 8, to slide in the same direction. During the movement of the auxiliary fork plate 9, the force-saving lever 112 is pulled. The force-saving lever 112 completes lever swing around the hinge fulcrum 111. The section of the force-saving lever 112 closer to the auxiliary fork plate 9 is longer. Due to the lever amplification effect, only a slight pushing force from the joint is needed to move the knee. The other end of the moving rod is displaced, and the lower end of the force-saving rod 112 is movably connected to the tension spring 12. The other end of the tension spring 12 is hinged upward to the extension plate 6 of the lower joint correction section 2, forming a staggered connection layout with the upper part higher and the lower part lower. When the force-saving rod 112 swings down, it pulls down the tension spring 12 to undergo tensile deformation and store elastic potential energy. The stretched spring applies a pulling force along the bending direction to the lower joint correction section 2, actively pulling the lower section to bend synchronously, providing knee flexion assistance for patients with injuries or insufficient muscle strength, and achieving the effect of effortless walking.

[0035] After the leg is straightened and returned to its original position after bending the knee and stepping, the joint cover 4 and the auxiliary fork plate 9 move back in the opposite direction, and the effort-saving bar 112 rotates accordingly. The staggered layout of the connection points at both ends of the tension spring 12 ensures that the spring only has the tendency to contract inward and will not press the effort-saving bar 112 in the opposite direction to form resistance. The spring slowly releases its stored energy, assisting the leg to straighten smoothly. There is no additional drag resistance throughout the process. By relying on the lever to amplify the elastic force and the staggered installation structure of the spring, it continuously provides auxiliary power in the walking flexion and extension cycle, reducing the load on the knee joint.

[0036] Furthermore, while the above-mentioned lever principle, combined with joint movement, can achieve a labor-saving effect and facilitate patient use, in actual operation, it only relies on the labor-saving pull of the tension spring 12, which in turn pulls the lower joint correction segment 2 to achieve labor-saving. The tension of the tension spring 12 is not high. To improve the labor-saving effect, this embodiment designs a new type of tension spring 12. The tension spring 12 includes two end joints 121, with multiple elastic plates 122 connected between the outer peripheries of the two end joints 121. A fixing tube 123 and a pin 124 are respectively set at the center between the two end joints 121. The fixing tube 123 is a hollow tube and is fixedly connected to one of the end joints 121. The pin 124 is tenon-inserted into the fixing tube 123 for limiting. One end of the pin 124 is rotatably connected to the other end joint 121 through a one-way bearing. A circulation cavity 1 is opened on the outer wall of the pin 124. 25. The circulation chamber 125 is designed to be closed at both ends of 360°. The circulation chamber 125 consists of multiple staggered straight sliding sections 1251 and inclined sections 1252. The transition area between the straight sliding section 1251 and the inclined section 1252 is provided with an auxiliary bending inflection point to guide the movement direction of the one-way bearing, ensuring normal circulation. In order to ensure power storage, multiple spring-loaded protrusions 126 are arranged at the position of the straight sliding section 1251. Multiple convex balls 127 that are adapted to the circulation chamber 125 are fixed on the inner wall of the fixing tube 123. The spring-loaded protrusions 126 are triangular in design and the inclined surface of the spring-loaded protrusions 126 is inclined. The convex balls 127 can be smoothly compressed and retracted. The straight surface of the spring-loaded protrusions 126 limits them, so the convex balls 127 will not move in the opposite direction, ensuring power storage. It can only be reset when it moves to the auxiliary bending inflection point. Thus, through power storage, a greater pulling force can be provided, making it more labor-saving.

[0037] Working principle: When walking with knees bent, the effort-saving lever 112 pulls the two end contacts 121 away from each other, and the insert 124 extends outward. The convex ball 127 slides forward along the circulation cavity 125. When it contacts the inclined surface of the spring-loaded protrusion 126, it can squeeze the protrusion inward to avoid it, and smoothly pass through the straight slide section 1251 to complete the stretching. At the same time, the outer peripheral elastic sheet 122 is stretched to store elastic force. After the convex ball 127 passes the spring-loaded protrusion 126, the spring-loaded protrusion 126 rebounds and resets. It relies on the flat blocking surface to lock the convex ball 127, restricting the retraction of the insert 124, and continuously locking the elastic potential energy to store force, greatly improving the overall energy storage and pulling force.

[0038] Once the leg completes the knee flexion and step, and the joint continues to extend until the assisted bending inflection point, the convex ball 127 reaches the reversing inclined section 1252 of the cavity. The straight-face limit of the spring-loaded protrusion 126 is no longer constrained, and the insert 124 rotates along the inclined section 1252 under the guidance of the one-way bearing. The locked elastic force is released quickly in one go, and the external output amplified traction force pulls the lower section 2 of joint correction. The amplified assistance effect is amplified by the phased force release. The peripheral elastic plate 122 rebounds and resets simultaneously, and the convex ball 127 moves along the cavity to another straight sliding section 1251, completing one force release cycle. The segmented locking force storage structure greatly increases the spring output pull force, further reducing the burden of walking force on the patient.

[0039] The embodiments disclosed in this invention are preferred embodiments, but are not limited thereto. Those skilled in the art can easily understand the spirit of this invention based on the above embodiments and make different extensions and variations, but as long as they do not depart from the spirit of this invention, they are all within the protection scope of this invention.

Claims

1. A medical auxiliary nursing device, characterized in that, include: The upper joint correction section (1) and the lower joint correction section (2) are rotatably connected; The joint cover (4) is located at the rotatable connection between the upper joint correction section (1) and the lower joint correction section (2), and is movably connected to the upper joint correction section (1) and the lower joint correction section (2). An auxiliary fork plate (9) is linked to the joint cover (4) and slides along an arc-shaped trajectory under constraint. The joint cover (4) is connected to two elastic straps (5) on both sides. The first auxiliary structure (10) is located on the auxiliary fork plate (9) and includes a sensing end and an execution end; in the standing posture, the sensing end is triggered as the auxiliary fork plate (9) slides, causing the execution end to switch from a contracted state to an expanded state; The support plate (105) has multiple grooved and sawtooth structures, which are fixed in position and are located adjacent to the execution end. When the execution end switches to the expanded state, the two are interlocked to form a rigid engagement that prevents the auxiliary fork plate (9) from sliding.

2. The medical auxiliary nursing device according to claim 1, characterized in that, The sensing end includes a pressure-sensitive layer (101) and a drive link (102). The pressure-sensitive layer (101) is fixed to the auxiliary fork plate (9). One end of the drive link (102) moves with the lower joint correction section (2), and the other end is detachably in contact with the pressure-sensitive layer (101) to conduct or disconnect the circuit with the execution end. The drive link (102) has a bending arc. When the lower joint correction section (2) bends slightly, it can drive one end of the drive link (102) to completely separate from the pressure-sensitive layer (101).

3. The medical auxiliary nursing device according to claim 2, characterized in that, The execution end includes a conductive strip (103) connected to the sensing end circuit, and an expansion portion (104) that contacts the conductive strip (103) and is fixed to the auxiliary fork plate (9); when the circuit is turned on, the expansion portion (104) is energized and expands from a contracted state to an expanded state.

4. The medical auxiliary nursing device according to claim 2, characterized in that, It also includes a buffer assembly disposed on the auxiliary fork plate (9), the buffer assembly including a bladder (107) with an air port, one end of the bladder (107) being fixed relative to the auxiliary fork plate (9), and the other end being linked with the drive link (102); when the drive link (102) is subjected to instantaneous compression, the bladder (107) cannot be compressed quickly due to the exhaust resistance of its air port, so as to prevent the drive link (102) from contacting the pressure-sensitive layer (101).

5. A medical auxiliary nursing device according to claim 4, characterized in that, The buffer assembly includes a fixed ring (106) fixed to the auxiliary fork plate (9) and a movable ring (108) fixed to the drive link (102). One end of the bladder (107) is connected to the fixed ring (106) and the other end is connected to the movable ring (108).

6. The medical auxiliary nursing device according to claim 1, characterized in that, It also includes a second auxiliary structure (11), which includes a force-saving rod (112) hinged to a fixed position and a tension spring (12); one end of the force-saving rod (112) is linked to the auxiliary fork plate (9), and the other end is movably connected to one end of the tension spring (12); the other end of the tension spring (12) is movably connected to the lower joint correction section (2); the force-saving rod (112) is used to amplify the displacement of the auxiliary fork plate (9) and act on the tension spring (12) to provide knee flexion assistance.

7. A medical auxiliary nursing device according to claim 6, characterized in that, The hinge point of the force-saving bar (112) is close to the end that is linked with the auxiliary fork plate (9), so that it forms an unequal length lever arm; the two ends of the tension spring (12) are arranged in an up-down staggered manner at the connection points on the lower joint correction section (2) and the force-saving bar (112), so that the tension spring (12) is only stretched when the knee is bent.

8. A medical auxiliary nursing device according to claim 6 or 7, characterized in that, The tension spring (12) includes two end contacts (121) arranged opposite to each other, an elastic sheet (122) connected between the two end contacts (121), and a one-way locking mechanism disposed inside; the one-way locking mechanism is used to lock the elastic force generated by the tension spring (12) when it is stretched, and release it when stretched to a predetermined position, so as to concentrate the output traction force.

9. A medical auxiliary nursing device according to claim 8, characterized in that, The one-way locking mechanism includes a plug (124) rotatably connected to one of the end contacts (121) and a fixed tube (123) fixed to the other end contact (121) and inserted into the plug (124). The outer wall of the plug (124) is provided with a circulation cavity (125). The inner wall of the fixed tube (123) is integrally formed with a convex ball (127) that cooperates with the circulation cavity (125). The circulation cavity (125) is provided with a one-way blocking structure that allows the convex ball (127) to pass through in one direction and locks its return.

10. A medical auxiliary nursing device according to claim 9, characterized in that, The circulation cavity (125) is composed of alternating straight slide section (1251) and inclined section (1252); the one-way locking structure is a plurality of spring-loaded protrusions (126) provided on the straight slide section (1251); the convex ball (127) is locked after sliding unidirectionally along the circulation cavity (125) past the spring-loaded protrusions (126), and the lock is released when it slides into the inclined section (1252).

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