A care walking aid

Abstract

The application relates to the technical field of nursing auxiliary devices, and discloses a nursing walking aid device which comprises a supporting frame, a forearm supporting plate, a walking wheel, a hydraulic load sensing driving assembly and a brake assembly. When the forearm supporting plate swings under pressure, the swing arm pulls the load sensing driving oil cylinder, the hydraulic oil enters the hydraulic driving cavity of the gas-liquid buffer release brake through the pressure transmission pipeline, the driving piston is pushed to compress the gas-liquid buffer pressure transmission cavity, and the brake piece is driven to press the brake follower disc. An adjustable flow passage is arranged between the gas-liquid buffer pressure transmission cavity and the release pressure storage cavity, the flow area can be changed by adjusting the knob, and the brake response sensitivity and the release speed are adjusted. The application can consider the anti-misbraking when normally supporting and pressing, the supporting brake when continuously pressing or unbalanced pressing and the reduced dependence training requirement in the later rehabilitation stage.

Description

Technical Field

[0001] This invention relates to the field of nursing assistive devices, and in particular to a nursing mobility aid device. Background Technology

[0002] Nursing-aid walking aids are commonly used to assist walking in elderly patients, postoperative patients, patients with lower limb weakness, and patients undergoing rehabilitation training. Existing nursing-aid walking aids typically include a support frame, handrails or armrests, walking wheels, and a braking mechanism. When in use, patients support themselves with their hands or forearms to reduce the burden on their lower limbs and maintain balance; when stopping or slowing down is required, the walking wheels are typically braked using a handbrake, foot brake, wheel brake, or an automatic braking mechanism.

[0003] While existing manual braking systems can achieve parking or deceleration, in nursing assistance scenarios, patients often cannot actively operate the handbrake or foot brake in time when they are leaning forward, leaning backward, experiencing leg weakness, being unsteady when standing up, or losing balance while sitting. Caregivers may also not be able to intervene simultaneously, causing the walking aid to continue to slip. Although some automatic braking systems can trigger braking upon detecting downward pressure, load changes, or changes in vehicle status, they typically use downward pressure or load changes directly as the braking trigger condition, resulting in a relatively fixed braking response.

[0004] However, in actual use, the downward pressure exerted by a patient on the handrail or armrest does not necessarily indicate a dangerous situation. Patients with more severe conditions or those just starting to use a walking aid may frequently, briefly, and with inconsistent force apply pressure to the device during normal walking due to gait instability, insufficient upper limb control, or anxiety. If the braking structure responds too forcefully to this type of downward pressure, it can easily cause the walking wheels to stop suddenly, affecting the continuity of the patient's gait and even increasing the risk of forward lurching or secondary imbalance. On the other hand, when the patient is indeed in a state of continuous downward pressure, stopping to rest, significant imbalance, or needing support, the walking aid needs to be able to provide sufficient braking support in a timely manner. Therefore, existing fixed-trigger or fixed-sensitivity braking structures cannot simultaneously meet the dual needs of "no accidental braking during normal support and pressure" and "timely support during abnormal imbalance and pressure."

[0005] Furthermore, some patients need to use walking aids to share their body weight in the early stages of rehabilitation. However, in the later stages, if patients habitually continue to push their weight onto the walking aid, it reduces the actual weight-bearing capacity of their lower limbs, hindering the recovery of lower limb muscle strength and the training of independent walking ability. Existing walking aids typically focus more on providing stable support and effortless assistance, lacking structures that can adjust braking sensitivity according to the patient's rehabilitation stage and guide patients to reduce their dependence on the walking aid's weight-bearing capacity through mechanical feedback.

[0006] Therefore, it is necessary to provide a nursing walking aid that can adjust the braking response sensitivity and braking release process according to the pressure state of the patient's forearm support area and different nursing and rehabilitation stages. This would prevent sudden stopping caused by short-term unconscious pressure when the condition is more serious, provide enhanced support under continuous pressure or imbalance, and guide patients to reduce their dependence on the walking aid in the later stages of rehabilitation. Summary of the Invention

[0007] The purpose of this invention is to provide a nursing walking aid device to solve the problems of existing nursing walking aid devices that mainly rely on manual braking or fixed trigger braking during use. These devices are difficult to adjust the braking response sensitivity according to different force states such as normal support and pressure, short-term unconscious pressure, continuous support and pressure, and unbalanced pressure. As a result, problems such as untimely braking, difficulty in controlling braking force, accidental braking during short-term pressure, or insufficient support during continuous pressure may occur.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: a nursing assistance device, comprising: A support frame, wherein a forearm support plate that can swing relative to the support frame is installed at the upper end of the support frame, and a traveling wheel is rotatably installed at the lower end of the support frame; A hydraulic load-sensing drive assembly is connected to the forearm support plate and is used to output hydraulic pressure when the forearm support plate is swung under pressure. A braking assembly, comprising a mounting base, brake pads, a brake follower disc, and a pneumatic-hydraulic slow-release brake, wherein the mounting base is fixedly connected to a support frame, the brake follower disc is coaxially fixedly connected to a traveling wheel, and the brake pads are slidably mounted in the mounting base and can be close to or away from the brake follower disc; The gas-liquid slow-release brake includes a valve body, a brake piston rod, a drive piston, a gas-liquid buffer pressure transmission chamber, a hydraulic drive chamber, and a slow-release pressure accumulator chamber. The brake piston rod is slidably installed in the valve body and connected to the brake pads. The drive piston is slidably installed in the valve body. The gas-liquid buffer pressure transmission chamber is formed between the brake piston rod and the drive piston. The hydraulic drive chamber is formed on the side of the drive piston away from the gas-liquid buffer pressure transmission chamber. The hydraulic load-sensing drive assembly is connected to the hydraulic drive chamber. The gas-liquid buffer pressure transmission chamber is filled with a liquid medium and a gas medium. An adjustable flow port is provided between the gas-liquid buffer pressure transmission chamber and the slow-release pressure storage chamber. The adjustable flow port is used to adjust the bidirectional flow speed of the gas-liquid mixture between the gas-liquid buffer pressure transmission chamber and the slow-release pressure storage chamber. When the front arm support plate swings under pressure, the hydraulic load-sensing drive assembly outputs hydraulic pressure to the hydraulic drive chamber. The hydraulic drive chamber pushes the drive piston to compress the gas-liquid buffer pressure transmission chamber, causing the brake piston rod to drive the brake pads to press against the brake follower disc.

[0009] Preferably, the hydraulic load-sensing drive assembly includes a load-sensing drive cylinder and a pressure transmission pipeline. A swing arm is provided on the lower side of the forearm support plate. The load-sensing drive cylinder is rotatably mounted on the support frame. The telescopic end of the load-sensing drive cylinder is rotatably connected to the swing arm. The rod chamber of the load-sensing drive cylinder is connected to the hydraulic drive chamber through the pressure transmission pipeline.

[0010] Preferably, when the forearm support plate is pressed forward and downward or backward and downward, the swing arm pulls the extension end of the load-sensing drive cylinder outward, so that the load-sensing drive cylinder outputs hydraulic pressure to the hydraulic drive chamber.

[0011] Preferably, the gas-liquid slow-release brake includes a slow-release outer cylinder, an adjusting inner cylinder, and an adjusting knob. The slow-release accumulator is formed inside the slow-release outer cylinder. The adjusting inner cylinder is slidably installed inside the slow-release outer cylinder. The adjusting knob is threaded onto the slow-release outer cylinder and is rotatably connected to the adjusting inner cylinder and axially limited. The adjusting inner cylinder and the adjusting knob constitute a throttling adjustment assembly. The surface of the slow-release outer cylinder is provided with a first flow window, and the surface of the adjustable inner cylinder is provided with a second flow window. The first flow window and the second flow window are staggered and overlapped to form the adjustable flow port.

[0012] Preferably, when the adjusting knob is screwed in or out relative to the slow-release outer cylinder, it drives the adjusting inner cylinder to slide along the axial direction of the slow-release outer cylinder, thereby changing the overlapping area of ​​the first flow window and the second flow window; a pre-tightening spring is sleeved on the outside of the adjusting knob, and the pre-tightening spring abuts between the adjusting knob and the slow-release outer cylinder to limit the adjusting knob from loosening due to the vibration of the walker; and a hexagonal limiting shaft that slides into the brake piston rod is provided at the bottom end of the adjusting inner cylinder.

[0013] Preferably, the slow-release accumulator chamber has a reserved gas compression space, or the slow-release accumulator chamber is provided with an elastic accumulator bladder to provide compression margin when the gas-liquid mixed medium enters the slow-release accumulator chamber from the gas-liquid buffer pressure transmission chamber through the adjustable flow port, and to push the gas-liquid mixed medium back to the gas-liquid buffer pressure transmission chamber through the adjustable flow port when the downward pressure on the forearm support plate is released.

[0014] Preferably, the throttling adjustment component has a low-sensitivity nursing opening range. Within the low-sensitivity nursing opening range, the overlap area of ​​the first flow window and the second flow window is within a preset overlap area range, so that the gas medium in the gas-liquid buffer pressure transmission chamber is retained in the gas-liquid buffer pressure transmission chamber when the forearm support plate is briefly pressurized, and absorbs part of the displacement and pressure of the driving piston.

[0015] Preferably, within the low-sensitivity nursing opening range, when the forearm support plate is continuously compressed, the gas-liquid mixture in the gas-liquid buffer pressure transmission chamber gradually enters the slow-release pressure transmission chamber through the adjustable flow port, thereby increasing the pressure transmission ratio of the liquid medium in the gas-liquid buffer pressure transmission chamber; after the forearm support plate is released for a short time, the compressed gas or elastic pressure accumulator in the slow-release pressure transmission chamber pushes the gas-liquid mixture to slowly flow back to the gas-liquid buffer pressure transmission chamber through the adjustable flow port, so as to maintain the support enhancement state for a preset time.

[0016] Preferably, the throttling adjustment component has a high-sensitivity, low-dependency training opening range. Within this range, the overlap area of ​​the first and second flow windows is greater than that within the low-sensitivity, low-dependency training opening range. This allows the gas-liquid mixture in the gas-liquid buffer pressure transmission chamber to enter the slow-release accumulator chamber at a flow velocity greater than that within the low-sensitivity, low-dependency training opening range when the forearm support plate is under pressure. This also increases the braking response speed of the brake pads to the brake follower disc, thereby increasing the pushing resistance of the traveling wheels when the forearm support plate is subjected to significant or continuous downward pressure.

[0017] Preferably, the valve body is provided with a return spring and a limiting step. The return spring abuts against the brake piston rod, so that the brake piston rod abuts against the limiting step in the initial state, and maintains a preset gap between the brake pad and the brake follower disc.

[0018] The present invention has the following beneficial effects: 1. This invention, through the cooperation of a forearm support plate, a hydraulic load-sensing drive assembly, and a pneumatic-hydraulic slow-release brake, transforms the downward pressure naturally exerted by the patient on the forearm support plate into a modulated braking force. This eliminates the need for the patient to actively judge the braking timing during walking, nor does it require precise control of braking force like manual braking. Furthermore, this invention does not immediately stop the wheels upon detecting pressure on the forearm support plate. Instead, it adjusts the braking response sensitivity through a pneumatic-hydraulic buffer pressure transmission chamber, a slow-release pressure accumulator chamber, and an adjustable flow port. This moderates the braking pressure build-up process during normal support, light support, or short-term unconscious pressure application, reducing the risk of frequent sudden stops. During sustained pressure application, significant imbalance, or when braking support is required, the braking support response gradually increases, balancing the needs for preventing accidental braking and providing braking support.

[0019] 2. This invention incorporates a gas-liquid buffer pressure transmission chamber between the brake piston rod and the drive piston. This chamber is filled with both liquid and gaseous media. The pressure within the hydraulic drive chamber is not directly and rigidly transmitted to the brake pads, but rather first compressed and modulated by the gas-liquid mixture before pushing the brake piston rod. When the patient briefly, suddenly, or unstablely presses down on the forearm support plate, the gaseous medium absorbs part of the displacement and pressure of the drive piston, preventing a sudden increase in braking force. When the patient continuously presses down on the forearm support plate, the gas-liquid mixture gradually shifts to the slow-release accumulator chamber, increasing the proportion of liquid media in the gas-liquid buffer pressure transmission chamber. This gradually enhances the braking support capacity as pressure is applied, creating a time-varying pressure transmission effect distinct from ordinary rigid hydraulic brakes.

[0020] 3. This invention forms an adjustable flow port by staggering and overlapping the first and second flow windows. An adjustment knob moves the inner cylinder to change the overlap area of ​​the first and second flow windows, thereby adjusting the bidirectional flow speed of the gas-liquid mixture between the gas-liquid buffer pressure transmission chamber and the slow-release pressure accumulator chamber. Therefore, the sensitivity of the braking component is not fixed but can be adjusted according to the patient's condition, gait stability, and training stage. When the adjustable flow port is in the low-sensitivity nursing opening range, its effective flow area is small, and the gas medium remains in the gas-liquid buffer pressure transmission chamber during short-term pressure application, resulting in a gentler braking action. When the adjustable flow port is in the high-sensitivity, reduced-dependency training opening range, its effective flow area increases, allowing the gas-liquid mixture to enter the slow-release pressure accumulator chamber more quickly, thus improving the braking response speed of the brake pads to the brake follower disc.

[0021] 4. This invention can provide different walking assistance effects according to different stages of patient rehabilitation. When the condition is more severe or when the patient has just started using the walker, the adjustable flow port can be set to a low-sensitivity nursing opening range, preventing sudden stops when the patient briefly presses down on the forearm support plate. When the patient continuously presses down on the forearm support plate to rest, the gas-liquid mixture gradually enters the slow-release accumulator chamber, allowing for faster establishment of braking support when pressing down again for short periods, providing enhanced support for patients with unstable standing to start again. In the later stages of patient rehabilitation, the adjustable flow port can be set to a high-sensitivity de-reliance training opening range. When the forearm support plate is subjected to significant or continuous downward pressure, the brake pads quickly press against the brake follower disc, increasing the pushing resistance of the walking wheels. When the patient only lightly rests on the forearm support plate and mainly relies on lower limb weight-bearing for walking, the walking wheels can rotate smoothly. Therefore, this invention not only provides safe braking but also guides patients to reduce their reliance on the walker's weight-bearing capacity through mechanical resistance feedback, promoting the recovery of lower limb active weight-bearing and independent walking ability. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the nursing assistance device proposed in this invention.

[0023] Figure 2 This is a side sectional view of the nursing assistance device proposed in this invention.

[0024] Figure 3 This is a side cross-sectional view of the hydraulic load-sensing drive assembly proposed in this invention.

[0025] Figure 4 This is a schematic diagram of the assembly structure of the mounting base, brake pads, brake follower disc, and gas-liquid slow-release brake proposed in this invention.

[0026] Figure 5 This is a schematic diagram of the exploded structure of the gas-liquid slow-release brake proposed in this invention.

[0027] Figure 6 This is a schematic diagram of the front section of the gas-liquid slow-release brake proposed in this invention.

[0028] Figure 7 This is a cross-sectional schematic diagram of the gas-liquid slow-release brake proposed in this invention within the low-sensitivity nursing opening range, wherein the adjustable flow port is in a small opening state, and the gas-liquid buffer pressure transmission chamber is filled with liquid medium and gas medium.

[0029] Figure 8 This is a cross-sectional schematic diagram of the gas-liquid slow-release brake proposed in this invention within a high-sensitivity, low-dependency training opening range. In this diagram, the adjustable flow port is in a large opening state, allowing the gas-liquid mixture in the gas-liquid buffer pressure transmission chamber to enter the slow-release pressure accumulator chamber through the adjustable flow port.

[0030] Figure 9 This is a cross-sectional view of the gas-liquid slow-release brake proposed in this invention in manual braking mode. As the adjustment knob continues to turn, it drives the inner cylinder of the adjustment cylinder or its lower hexagonal limiting shaft to move downward, so as to directly press down the brake piston rod, so that the brake pads press against the brake follower disc.

[0031] In the picture: 100. Support frame; 101. Forearm support plate; 102. Traveling wheel; 103. Linkage rod; 201. Load-sensing drive cylinder; 202. Pressure transmission pipeline; 203. Swing arm; 301. Mounting base; 302. Brake pad; 303. Brake follower disc; 304. Pneumatic-hydraulic slow-release brake; 305. Valve body; 306. Brake piston rod; 307. Drive piston; 308. Pneumatic-hydraulic buffer pressure transmission chamber; 309. Hydraulic drive chamber; 310. Slow-release accumulator chamber; 311. Slow-release outer cylinder; 312. Adjusting inner cylinder; 313. Adjusting knob; 314. Preload spring; 315. Hexagonal limit shaft; 316. Return spring; 317. Limiting step; 400, Adjustable flow port; 401, First flow window; 402, Second flow window. Detailed Implementation

[0032] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0033] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0034] Example 1: Overall structure and hydraulic load-sensing drive process; Reference Figures 1 to 5 This embodiment provides a nursing walking assistance device, including a support frame 100, a forearm support plate 101, walking wheels 102, a hydraulic load-sensing drive assembly, and a braking assembly.

[0035] The support frame 100 forms the main support structure of the nursing walking aid device. The support frame 100 may include side supports arranged opposite each other, a transverse connecting rod connecting the side supports, and a wheel frame structure located at the bottom. Walking wheels 102 are rotatably mounted on the lower end of the support frame 100, allowing the patient to push the nursing walking aid device. A forearm support plate 101 is disposed at the upper end of the support frame 100 to support the patient's forearm. Specifically, two forearm support plates 101 may be arranged opposite each other, each supporting the patient's left and right forearms respectively, and the two forearm support plates 101 are connected by a connecting rod 103. By setting the connecting rod 103, the two forearm support plates 101 can form a linked force when compressed, avoiding significant eccentric loading on only one side of the structure when one forearm is compressed, thereby improving the stress stability of the forearm support plate 101 and the consistency of hydraulic load triggering.

[0036] When the patient is walking, standing, getting up, or experiencing instability in their posture, they can place or press their forearm on the forearm support plate 101 and receive auxiliary support through it. When the forearm support plate 101 is pressed down by the patient's forearm, the forearm support plate 101 can swing relative to the support frame 100, which further drives the hydraulic load-sensing drive assembly to move.

[0037] like Figure 3As shown, the forearm support plate 101 is swayably mounted on the support frame 100. Specifically, the forearm support plate 101 can be connected to the support frame 100 via a pivot, hinge, or swing bracket, allowing the forearm support plate 101 to swing relative to the support frame 100 when pressed down by the patient's forearm. A swing arm 203 is provided on the underside of the forearm support plate 101.

[0038] The hydraulic load-sensing drive assembly includes a load-sensing drive cylinder 201 and a pressure transmission line 202. The load-sensing drive cylinder 201 is rotatably mounted on the support frame 100, and its telescopic end is rotatably connected to the swing arm 203. Figure 3 As shown, when the forearm support plate 101 is in the initial supporting posture, the swing axis of the forearm support plate 101 relative to the support frame 100, the rotation axis of the load-sensing drive cylinder 201 relative to the support frame 100, and the rotational connection axis between the swing arm 203 and the extension end of the load-sensing drive cylinder 201 are arranged at intervals in the vertical direction, and the axes of the three do not coincide; the rotational connection axis between the swing arm 203 and the extension end of the load-sensing drive cylinder 201 is in the initial neutral position; when the forearm support plate 101 is pressed forward and downward or backward and swings around its swing axis, the rotational connection axis deviates from the initial neutral position with the swing arm 203, and the distance between it and the rotation axis of the cylinder body of the load-sensing drive cylinder 201 increases, thereby pulling the extension end of the load-sensing drive cylinder 201 outward. The rod chamber of the load-sensing drive cylinder 201 is connected to the pressure transmission line 202, and the pressure transmission line 202 is connected to the hydraulic drive chamber 309 of the gas-liquid slow-release brake 304 (described later).

[0039] When the forearm support plate 101 is pressed down by the patient's forearm and swings, the swing arm 203 swings synchronously with the forearm support plate 101, pulling the extension end of the load-sensing drive cylinder 201 outward. Since the rod chamber of the load-sensing drive cylinder 201 is connected to the pressure transmission line 202, the volume of the rod chamber decreases when the extension end extends. The hydraulic oil in the rod chamber is forced into the hydraulic drive chamber 309 through the pressure transmission line 202, thereby outputting hydraulic pressure to the braking assembly.

[0040] Furthermore, the forearm support plate 101 can be configured to trigger the swing arm 203 in both the forward and backward directions. That is, when the patient leans forward and presses the forearm support plate 101 downward, the swing arm 203 deviates from its initial mid-position and pulls the extension end of the load-sensing drive cylinder 201 outward; similarly, when the patient leans backward, becomes unsteady while standing, or becomes unsteady while sitting, the swing arm 203 deviates from its initial mid-position and pulls the extension end of the load-sensing drive cylinder 201 outward. Thus, the nursing assistance device can adapt to situations where the direction of force applied to the patient is unstable during actual nursing assistance, without requiring the patient to perform braking operations in a fixed direction or posture.

[0041] like Figure 4 , Figure 5 As shown, the braking assembly includes a mounting base 301, brake pads 302, a brake follower disc 303, and a pneumatic-hydraulic slow-release brake 304. The mounting base 301 is fixedly mounted on the support frame 100 and positioned close to the traveling wheel 102. The brake follower disc 303 is disposed within the mounting base 301 and coaxially connected to the traveling wheel 102, enabling it to rotate synchronously with the traveling wheel 102. The brake pads 302 are slidably mounted within the mounting base 301, and can move closer to or further away from the brake follower disc 303 under the drive of the pneumatic-hydraulic slow-release brake 304. When the brake pads 302 press against the brake follower disc 303, frictional resistance is generated between the brake pads 302 and the brake follower disc 303, thereby braking the traveling wheel 102.

[0042] In this embodiment, the downward pressure exerted by the patient on the forearm support plate 101 is not directly and rigidly applied to the brake pad 302. Instead, it is first converted into hydraulic pressure through the forearm support plate 101, the swing arm 203, and the load-sensing drive cylinder 201, and then input to the pneumatic-hydraulic slow-release brake 304 through the pressure transmission pipeline 202. Thus, the downward pressure generated by the patient under different states such as normal support, short-term downward pressure, continuous support, or unbalanced downward pressure can all be converted into a further modulated hydraulic signal. The patient does not need to actively judge the braking timing during walking, nor does he / she need to precisely control the braking force like operating a handbrake. The pneumatic-hydraulic slow-release brake 304 can buffer, delay, or enhance the braking pressure establishment process according to the input pressure state and the opening of the adjustable flow port 400, thereby providing a basis for subsequent braking sensitivity adjustment.

[0043] Example 2: Gas-liquid slow-release brake and adjustable flow port structure; Reference Figures 4 to 6 This embodiment describes the specific structure of the gas-liquid slow-release brake 304 based on Embodiment 1.

[0044] like Figure 5 , Figure 6 As shown, the gas-liquid slow-release brake 304 includes a valve body 305, a brake piston rod 306, a drive piston 307, a gas-liquid buffer pressure transmission chamber 308, a hydraulic drive chamber 309, and a slow-release accumulator chamber 310. The valve body 305 is mounted on a mounting base 301. The brake piston rod 306 is slidably mounted within the valve body 305, and one end of the brake piston rod 306 is connected to the brake pad 302, so that when the brake piston rod 306 moves, it can drive the brake pad 302 closer to or further away from the brake follower disc 303. The drive piston 307 is slidably mounted within the valve body 305 and is located on the side of the brake piston rod 306 away from the brake pad 302.

[0045] like Figure 6As shown, the gas-liquid buffer pressure transmission chamber 308 is formed between the brake piston rod 306 and the drive piston 307, and the hydraulic drive chamber 309 is formed on the side of the drive piston 307 away from the gas-liquid buffer pressure transmission chamber 308. The pressure transmission line 202 is connected to the hydraulic drive chamber 309. When the front arm support plate 101 is pressed and the load-sensing drive cylinder 201 outputs hydraulic oil to the pressure transmission line 202, the hydraulic oil enters the hydraulic drive chamber 309, increasing the pressure inside the hydraulic drive chamber 309, which in turn pushes the drive piston 307 toward the brake piston rod 306.

[0046] The gas-liquid buffer pressure transmission chamber 308 is filled with a liquid medium and a gas medium. The liquid medium can be hydraulic oil, silicone oil, or other liquid media suitable for transmitting pressure; the gas medium can be air, nitrogen, or other compressible gases. When the drive piston 307 moves, it compresses the gas-liquid buffer pressure transmission chamber 308. The liquid medium in the gas-liquid buffer pressure transmission chamber 308 is used to transmit pressure, and the gas medium is used to absorb part of the displacement and pressure impact, so that the braking pressure is not rigidly transmitted to the brake piston rod 306 instantaneously. This avoids the brake pad 302 immediately and forcefully pressing the brake follower disc 303 when the patient unconsciously presses down on the forearm support plate 101 for a short time.

[0047] The gas-liquid slow-release brake 304 also includes a slow-release outer cylinder 311, an adjusting inner cylinder 312, and an adjusting knob 313. The slow-release outer cylinder 311 is fixedly connected to the valve body 305, and a slow-release accumulator chamber 310 is formed inside the slow-release outer cylinder 311. The slow-release accumulator chamber 310 is connected to the gas-liquid buffer pressure transmission chamber 308 through an adjustable flow port 400. The adjusting inner cylinder 312 is slidably installed inside the slow-release outer cylinder 311, and the adjusting knob 313 is threaded onto the slow-release outer cylinder 311. The adjusting knob 313 is rotatably connected to the adjusting inner cylinder 312 and axially limited. When the adjusting knob 313 is screwed in or out, it can drive the adjusting inner cylinder 312 to move axially along the slow-release outer cylinder 311.

[0048] It should be noted that sealing rings, sealing sleeves, or sliding sealing structures can be provided at the sliding fit parts between the drive piston 307, the brake piston rod 306 and the valve body 305, between the drive piston 307 and the slow-release outer cylinder 311, and between the slow-release outer cylinder 311 and the adjusting inner cylinder 312. This is to maintain the pressure boundaries of the hydraulic drive chamber 309, the gas-liquid buffer pressure transmission chamber 308, and the slow-release accumulator chamber 310, and to prevent cross-flow or leakage of the medium in each chamber at non-predetermined channels. The above sealing structures can be implemented by those skilled in the art using conventional hydraulic sealing methods, and will not be elaborated upon here.

[0049] The outer cylinder 311 has a first flow window 401 on its surface, and the inner cylinder 312 has a second flow window 402 on its surface. The first flow window 401 and the second flow window 402 overlap in a staggered manner to form an adjustable flow port 400. When the adjusting knob 313 moves the inner cylinder 312 axially, the overlap area of ​​the first flow window 401 and the second flow window 402 changes, thereby changing the effective flow area of ​​the adjustable flow port 400. The larger the effective flow area of ​​the adjustable flow port 400, the faster the flow velocity of the gas-liquid mixture between the gas-liquid buffer pressure transmission chamber 308 and the slow-release pressure storage chamber 310; the smaller the effective flow area of ​​the adjustable flow port 400, the slower the flow velocity of the gas-liquid mixture.

[0050] To prevent circumferential rotation of the adjusting inner cylinder 312 during adjustment, a hexagonal limiting shaft 315 can be provided at the lower end of the adjusting inner cylinder 312, and a hexagonal guide hole that mates with the hexagonal limiting shaft 315 is provided in the brake piston rod 306. The hexagonal limiting shaft 315 slides into the hexagonal guide hole, allowing the adjusting inner cylinder 312 to move axially but preventing circumferential rotation, thereby maintaining a stable correspondence between the first flow window 401 and the second flow window 402.

[0051] A preload spring 314 can be fitted on the outside of the adjustment knob 313. The preload spring 314 abuts between the adjustment knob 313 and the slow-release outer cylinder 311 to apply a preload force to the adjustment knob 313, reducing the possibility of the adjustment knob 313 loosening due to the vibration of the device, thereby keeping the opening of the adjustable flow port 400 stable.

[0052] The slow-release accumulator chamber 310 has a reserved gas compression space, or it is equipped with an elastic accumulator bladder. When the front arm support plate 101 is compressed, the gas-liquid mixture in the gas-liquid buffer pressure transmission chamber 308 can enter the slow-release accumulator chamber 310 through the adjustable flow port 400, compressing the gas compression space or elastic accumulator bladder within the slow-release accumulator chamber 310. After the downward pressure on the front arm support plate 101 is released, the compressed gas or elastic accumulator in the slow-release accumulator chamber 310 pushes the gas-liquid mixture back to the gas-liquid buffer pressure transmission chamber 308 through the adjustable flow port 400, gradually releasing the braking pressure.

[0053] A return spring 316 and a limiting step 317 may also be provided inside the valve body 305. The return spring 316 presses against the brake piston rod 306, so that the brake piston rod 306 abuts against the limiting step 317 in the initial state, and maintains a preset gap between the brake pad 302 and the brake follower disc 303. Thus, when the forearm support plate 101 is not pressed or is only subjected to slight support pressure, the brake pad 302 will not continuously rub against the brake follower disc 303, avoiding dragging during normal driving assistance. When the hydraulic drive chamber 309 is pressurized, the drive piston 307 compresses the gas-liquid buffer pressure transmission chamber 308, and the brake piston rod 306 moves against the elastic force of the return spring 316, so that the brake pad 302 presses against the brake follower disc 303; when the pressure is released, the return spring 316 pushes the brake piston rod 306 to return to its original position, so that the brake pad 302 gradually moves away from the brake follower disc 303.

[0054] In this embodiment, the contact between the brake pad 302 and the brake follower disc 303 does not necessarily cause the traveling wheel 102 to lock immediately. The degree of braking effect of the brake pad 302 on the brake follower disc 303 is related to the pushing force on the brake piston rod 306 and the degree of pressure of the brake pad 302 on the brake follower disc 303. When the pressure in the gas-liquid buffer pressure transmission chamber 308 is low or the displacement of the brake piston rod 306 is small, the brake pad 302 can form contact friction or light pressure friction with the brake follower disc 303. At this time, the traveling wheel 102 can still rotate under the action of the thrust, only showing an increase in pushing resistance. When the input pressure of the hydraulic drive chamber 309 increases, or the pressure in the gas-liquid buffer pressure transmission chamber 308 gradually increases due to the continuous pressure on the forearm support plate 101, the pressing force of the brake pad 302 on the brake follower disc 303 increases accordingly, and the pushing resistance of the traveling wheel 102 further increases until a braking state close to locking or locked is formed.

[0055] With the above structure, the gas-liquid slow-release brake 304 can modulate the speed of brake pressure build-up and release after the load-sensing drive cylinder 201 outputs hydraulic pressure. This structure is not a simple fixed-pressure brake structure, but rather utilizes the gas-liquid buffer pressure transmission chamber 308, the slow-release accumulator chamber 310, and the adjustable flow port 400 to form an adjustable-sensitivity gas-liquid slow-release braking process.

[0056] It should be noted that in this embodiment, the pressure transmission line 202 is not only used to input the hydraulic oil in the rod chamber of the load-sensing drive cylinder 201 into the hydraulic drive chamber 309 when the forearm support plate 101 is under pressure, but also to form a reverse oil return channel after the downward pressure on the forearm support plate 101 is released. Specifically, when the forearm support plate 101 is no longer under significant downward pressure, the gas medium in the gas-liquid buffer pressure transmission chamber 308 and the slow-release pressure accumulator chamber 310 has a restoring pressure, and the return spring 316 applies a reset action to the brake piston rod 306. This reset action can be transmitted to the drive piston 307 through the medium in the gas-liquid buffer pressure transmission chamber 308, causing the drive piston 307 to reset towards the hydraulic drive chamber 309, and pushing the hydraulic oil in the hydraulic drive chamber 309 back to the rod chamber of the load-sensing drive cylinder 201 through the pressure transmission line 202.

[0057] refer to Figure 3 Because the hydraulic oil flows back to the rod chamber of the load-sensing drive cylinder 201, it can retract the piston of the load-sensing drive cylinder 201, causing the extension end of the load-sensing drive cylinder 201 to drive the forearm support plate 101 back to its initial support position via the swing arm 203, or to keep the forearm support plate 101 in a basic support posture. Therefore, the forearm support plate 101 will not sag freely or wobble loosely due to the swing connection between it and the support frame 100, and can maintain a relatively stable initial pressure position, thus ensuring that the hydraulic load-sensing drive assembly can be stably triggered when the patient presses down on the forearm support plate 101 next time.

[0058] Example 3: Low-sensitivity nursing access range and high-sensitivity de-dependency training access range; Reference Figure 7 and Figure 8 This embodiment, based on Embodiment 2, describes the working process of the gas-liquid slow-release brake 304 under different opening ranges.

[0059] During assisted walking, the downward pressure exerted by the patient on the forearm support plate 101 does not necessarily indicate a dangerous situation. For patients with more severe conditions, those just starting to use a walking aid, or those with weak lower limb strength, the forearm support plate 101 may be pressed frequently, briefly, or with unstable force during normal walking. If the braking structure immediately and forcibly stops the walking wheel 102 as soon as it detects downward pressure, it is easy to cause the walking wheel 102 to stop frequently and suddenly, affecting the continuity of gait and even causing the patient's body to lurch forward. Therefore, this embodiment allows the assisted walking device to adaptively adjust between a low-sensitivity nursing state and a high-sensitivity de-dependency training state by adjusting the opening of the adjustable flow port 400.

[0060] It should be noted that the low-sensitivity nursing opening range and the high-sensitivity de-dependency training opening range mentioned in this embodiment are not limited to two fixed positions, but rather represent two typical usage states formed when the adjustable flow port 400 is in different opening ranges. The overlap area of ​​the first flow window 401 and the second flow window 402 can continuously change as the adjustment knob 313 is turned in or out, so the effective flow area of ​​the adjustable flow port 400 can be continuously adjusted between small and large openings. Nursing staff can adjust the braking response sensitivity to a suitable range according to the patient's condition, gait stability, and rehabilitation stage.

[0061] Reference Figure 7 Within the low-sensitivity care opening range, the adjusting knob 313 moves the adjusting inner cylinder 312, causing the overlap area of ​​the first flow window 401 and the second flow window 402 to be within a preset overlap area range, and the adjustable flow port 400 to be in a small opening state. When the forearm support plate 101 is briefly compressed, the hydraulic drive chamber 309 pushes the drive piston 307 to compress the gas-liquid buffer pressure transmission chamber 308. Because the effective flow area of ​​the adjustable flow port 400 is small, the gas medium in the gas-liquid buffer pressure transmission chamber 308 does not easily enter the slow-release pressure storage chamber 310 in a short time, and a large amount of gas medium remains in the gas-liquid buffer pressure transmission chamber 308 and is compressed. The gas medium absorbs part of the displacement and pressure of the driving piston 307, making the process of the brake piston rod 306 pushing the brake pad 302 relatively smooth. Even if the brake pad 302 comes into contact with the brake follower disc 303, it mainly manifests as a gradually increasing frictional resistance, rather than immediately locking the walking wheel 102. This avoids the walking wheel 102 from suddenly stopping when the patient is normally supporting, pressing down unconsciously for a short time, or making slight posture adjustments.

[0062] When the patient continuously presses down on the forearm support plate 101 to rest, support their body, or experience significant imbalance, although the adjustable flow port 400 remains slightly open, the gas-liquid mixture in the gas-liquid buffer pressure transmission chamber 308 will gradually enter the slow-release pressure storage chamber 310 through the adjustable flow port 400 under continuous pressure. As the gas-liquid mixture gradually shifts, the pressure transmission ratio of the liquid medium in the gas-liquid buffer pressure transmission chamber 308 increases, while the buffering effect of the gas medium relatively decreases, thus increasing the equivalent compressive stiffness of the gas-liquid buffer pressure transmission chamber 308. At this time, the pressure of the drive piston 307 can be transmitted more directly to the brake piston rod 306, and the clamping ability of the brake pad 302 on the brake follower disc 303 is enhanced, thereby gradually forming a stronger dynamic support under continuous pressure or when support is required.

[0063] Furthermore, when the patient briefly releases the forearm support plate 101 within the low-sensitivity nursing range, the compressed gas or elastic accumulator in the slow-release accumulator chamber 310 pushes the gas-liquid mixture medium to slowly flow back through the adjustable flow port 400 to the gas-liquid buffer pressure transmission chamber 308. Because the effective flow area of ​​the adjustable flow port 400 is relatively small, the backflow process requires a certain amount of time. During this time, the gas-liquid buffer pressure transmission chamber 308 maintains a high proportion of liquid medium pressure transmission, allowing the device to maintain a supported and enhanced state for a short period. Therefore, when the patient starts walking again after resting, or when the forearm support plate 101 is pressed down again within a short time, the braking support can be established more quickly, improving the safety of patients with unstable standing when starting again.

[0064] Reference Figure 8 Within the high-sensitivity, reduced-dependency training opening range, the adjusting knob 313 moves the adjusting inner cylinder 312, causing the overlapping area of ​​the first flow window 401 and the second flow window 402 to be greater than the overlapping area within the low-sensitivity nursing opening range, thus placing the adjustable flow port 400 at a large opening. When the forearm support plate 101 is subjected to significant downward pressure, the gas-liquid mixture in the gas-liquid buffer pressure transmission chamber 308 can enter the slow-release pressure accumulator chamber 310 through the adjustable flow port 400 at a flow velocity greater than that within the low-sensitivity nursing opening range. The pressure transmission ratio of the liquid medium in the gas-liquid buffer pressure transmission chamber 308 increases rapidly, and the response speed of the brake piston rod 306 pushing the brake pad 302 to press against the brake follower disc 303 increases.

[0065] Within the high-sensitivity de-dependency training range, if the patient places significant weight on the forearm support plate 101 and attempts to continuously propel the walking aid using the nursing assistance device, the brake pad 302 will quickly press against the brake follower disc 303, increasing the pushing resistance of the walking wheels 102 and even causing them to lock. The patient will then find it difficult to smoothly propel the walking aid by continuously pressing down on the forearm support plate 101. Conversely, when the patient only lightly rests on the forearm support plate 101 and primarily relies on the lower limbs for active weight-bearing, the forearm support plate 101 has a smaller triggering effect on the hydraulic load-sensing drive component. The brake pad 302 will not significantly press against the brake follower disc 303, and the walking wheels 102 can maintain smooth rotation. Therefore, the nursing assistance device can guide the patient to reduce their reliance on the walking aid through mechanical resistance feedback, promoting the recovery of active weight-bearing and independent walking abilities of the lower limbs.

[0066] Therefore, this embodiment uses the same set of gas-liquid slow-release brakes 304 to form different usage states according to different opening ranges of the adjustable flow port 400: in the low-sensitivity nursing opening range, short-term pressure is not easy to brake suddenly, and continuous pressure can gradually enhance support; in the high-sensitivity de-dependence training opening range, significant pressure will increase the pushing resistance, thereby playing a training feedback role. This structure can take into account both the safety support in the early stage of nursing and the de-dependence training in the later stage of rehabilitation.

[0067] Example 4: Manual braking mode; Reference Figure 9 This embodiment describes the manual braking mode of the gas-liquid slow-release brake 304 based on the above embodiment.

[0068] In practical use, in addition to automatically responding to the pressure applied to the forearm support plate 101 by the patient, the nursing walking aid may also require prolonged parking or active locking in certain scenarios. For example, when the patient needs to rest in place, when caregivers need to transfer or tidy the patient, when the device is parked on a slope or slippery surface, or when caregivers wish to actively lock the walking wheels 102 without the patient triggering the forearm support plate 101. Therefore, the gas-liquid slow-release brake 304 in this embodiment also includes a manual braking mode.

[0069] In manual braking mode, caregivers or patients can turn the adjustment knob 313 in, causing the inner adjusting cylinder 312 to move downwards along the axial direction of the slow-release outer cylinder 311. A hexagonal limiting shaft 315 is located at the lower end of the inner adjusting cylinder 312. The hexagonal limiting shaft 315 moves downwards synchronously with the inner adjusting cylinder 312 and can directly or indirectly press against the brake piston rod 306. Under the pressure of the hexagonal limiting shaft 315, the brake piston rod 306 overcomes the elastic force of the return spring 316, thereby causing the brake pad 302 to press against the brake follower disc 303, causing the traveling wheel 102 to enter a manual braking or manual locking state.

[0070] Furthermore, as the adjusting knob 313 continues to rotate and causes the adjusting inner cylinder 312 to move downward, the second flow window 402 on the adjusting inner cylinder 312 moves downward synchronously with the adjusting inner cylinder 312, and at least partially extends out of the slow-release outer cylinder 311, or moves to a pressure-relief position communicating with the slow-release accumulator chamber 310. At this time, the gas-liquid mixture in the gas-liquid buffer pressure transmission chamber 308 can enter the slow-release accumulator chamber 310 through the second flow window 402. Since the gas-liquid mixture can be introduced into the slow-release accumulator chamber 310 during the downward movement of the adjusting inner cylinder 312, the adjusting inner cylinder 312 does not need to directly compress the gas-liquid mixture in the closed state when it moves downward, thereby reducing the resistance of the gas-liquid mixture to the downward movement of the adjusting inner cylinder 312 and reducing the operating force required when manually rotating the adjusting knob 313.

[0071] Meanwhile, since the brake pad 302 and the brake follower disc 303 maintain only a preset gap in the initial state, and this preset gap is small, the brake piston rod 306 only needs to move a small distance to make the brake pad 302 press against the brake follower disc 303. Correspondingly, the continued rotation stroke of the adjustment knob 313 after entering the manual braking mode does not need to be set too large to achieve the manual braking effect. Thus, this embodiment can enable the gas-liquid slow-release brake 304 to have both sensitivity adjustment function and manual parking function without significantly increasing the operating stroke and operating burden, thereby improving the operational convenience and parking reliability of the nursing walking assistance device.

[0072] When it is necessary to release the manual brake, turn the adjustment knob 313 in the opposite direction to release the pressure of the inner cylinder 312 and the hexagonal limiting shaft 315 on the brake piston rod 306. At this time, the return spring 316 pushes the brake piston rod 306 to return to its original position, causing the brake pad 302 to move away from the brake follower disc 303, and allowing the preset gap to be re-established between the brake pad 302 and the brake follower disc 303, so that the traveling wheel 102 can rotate again.

[0073] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A nursing assistance device, characterized in that, include: A support frame (100) is provided with a forearm support plate (101) that can swing relative to the support frame (100) at its upper end, and a walking wheel (102) is rotatably installed at the lower end of the support frame (100). A hydraulic load-sensing drive assembly is connected to the forearm support plate (101) and is used to output hydraulic pressure when the forearm support plate (101) is swung under pressure. The braking assembly includes a mounting base (301), a brake pad (302), a brake follower disc (303), and a gas-liquid slow-release brake (304). The mounting base (301) is fixedly connected to the support frame (100), the brake follower disc (303) is coaxially fixedly connected to the traveling wheel (102), and the brake pad (302) is slidably mounted in the mounting base (301) and can be close to or away from the brake follower disc (303). The gas-liquid slow-release brake (304) includes a valve body (305), a brake piston rod (306), a drive piston (307), a gas-liquid buffer pressure transmission chamber (308), a hydraulic drive chamber (309), and a slow-release accumulator chamber (310). The brake piston rod (306) is slidably installed in the valve body (305) and connected to the brake pad (302). The drive piston (307) is slidably installed in the valve body (305). The gas-liquid buffer pressure transmission chamber (308) is formed between the brake piston rod (306) and the drive piston (307). The hydraulic drive chamber (309) is formed on the side of the drive piston (307) away from the gas-liquid buffer pressure transmission chamber (308). The hydraulic load-sensing drive assembly is connected to the hydraulic drive chamber (309). The gas-liquid buffer pressure transmission chamber (308) is filled with a liquid medium and a gas medium. An adjustable flow port (400) is provided between the gas-liquid buffer pressure transmission chamber (308) and the slow-release pressure storage chamber (310). The adjustable flow port (400) is used to adjust the bidirectional flow speed of the gas-liquid mixture between the gas-liquid buffer pressure transmission chamber (308) and the slow-release pressure storage chamber (310). When the front arm support plate (101) is swayed under pressure, the hydraulic load-sensing drive assembly outputs hydraulic pressure to the hydraulic drive chamber (309). The hydraulic drive chamber (309) pushes the drive piston (307) to compress the gas-liquid buffer pressure transmission chamber (308), causing the brake piston rod (306) to drive the brake pad (302) to press against the brake follower disc (303).

2. The nursing assistance device according to claim 1, characterized in that: The hydraulic load-sensing drive assembly includes a load-sensing drive cylinder (201) and a pressure transmission pipeline (202). A swing arm (203) is provided on the lower side of the forearm support plate (101). The load-sensing drive cylinder (201) is rotatably mounted on the support frame (100). The telescopic end of the load-sensing drive cylinder (201) is rotatably connected to the swing arm (203). The rod chamber of the load-sensing drive cylinder (201) is connected to the hydraulic drive chamber (309) through the pressure transmission pipeline (202).

3. The nursing assistance device according to claim 2, characterized in that: When the forearm support plate (101) is pressed forward or backward, the swing arm (203) pulls the extension end of the load-sensing drive cylinder (201) to extend outward, so that the load-sensing drive cylinder (201) outputs hydraulic pressure to the hydraulic drive chamber (309).

4. The nursing assistance device according to claim 1, characterized in that: The gas-liquid slow-release brake (304) includes a slow-release outer cylinder (311), an adjusting inner cylinder (312), and an adjusting knob (313). The slow-release accumulator (310) is formed inside the slow-release outer cylinder (311). The adjusting inner cylinder (312) is slidably installed inside the slow-release outer cylinder (311). The adjusting knob (313) is threaded onto the slow-release outer cylinder (311) and is rotatably connected to the adjusting inner cylinder (312) and axially limited. The adjusting inner cylinder (312) and the adjusting knob (313) constitute a throttling adjustment assembly. The surface of the slow-release outer cylinder (311) is provided with a first flow window (401), and the surface of the adjustable inner cylinder (312) is provided with a second flow window (402). The first flow window (401) and the second flow window (402) are offset and overlapped to form the adjustable flow port (400).

5. The nursing assistance device according to claim 4, characterized in that: When the adjustment knob (313) is screwed into or out of the release outer cylinder (311), it drives the adjustment inner cylinder (312) to slide along the axial direction of the release outer cylinder (311) to change the overlapping area of ​​the first flow window (401) and the second flow window (402). A pre-tensioning spring (314) is sleeved on the outside of the adjustment knob (313), and the pre-tensioning spring (314) abuts between the adjustment knob (313) and the release outer cylinder (311) to limit the adjustment knob (313) from loosening due to the vibration of the walking aid. A hexagonal limiting shaft (315) is provided at the bottom end of the adjustment inner cylinder (312) and slides into the brake piston rod (306).

6. The nursing assistance device according to claim 1, characterized in that: The slow-release accumulator chamber (310) has a reserved gas compression space, or the slow-release accumulator chamber (310) is provided with an elastic accumulator bladder, so as to provide compression margin when the gas-liquid mixed medium enters the slow-release accumulator chamber (310) from the gas-liquid buffer pressure transmission chamber (308) through the adjustable flow port (400), and push the gas-liquid mixed medium back to the gas-liquid buffer pressure transmission chamber (308) through the adjustable flow port (400) when the downward pressure on the forearm support plate (101) is released.

7. The nursing assistance device according to claim 4, characterized in that: The throttling adjustment component has a low-sensitivity nursing opening range. Within the low-sensitivity nursing opening range, the overlapping area of ​​the first flow window (401) and the second flow window (402) is within a preset overlapping area range, so that the gas medium in the gas-liquid buffer pressure transmission chamber (308) is retained in the gas-liquid buffer pressure transmission chamber (308) when the forearm support plate (101) is briefly pressurized, and absorbs part of the displacement and pressure of the drive piston (307).

8. The nursing assistance device according to claim 7, characterized in that: Within the low sensitivity nursing opening range, when the forearm support plate (101) is continuously compressed, the gas-liquid mixture in the gas-liquid buffer pressure transmission chamber (308) gradually enters the slow-release pressure accumulator chamber (310) through the adjustable flow port (400), thereby increasing the pressure transmission ratio of the liquid medium in the gas-liquid buffer pressure transmission chamber (308). After the forearm support plate (101) is released for a short time, the compressed gas or elastic pressure accumulator in the slow-release pressure accumulator chamber (310) pushes the gas-liquid mixture to slowly flow back to the gas-liquid buffer pressure transmission chamber (308) through the adjustable flow port (400) to maintain the support enhancement state for a preset time.

9. The nursing assistance device according to claim 4, characterized in that: The throttling adjustment component has a high-sensitivity, low-dependency training opening range. Within the high-sensitivity, low-dependency training opening range, the overlapping area of ​​the first flow window (401) and the second flow window (402) is greater than the overlapping area within the low-sensitivity care opening range. This allows the gas-liquid mixture in the gas-liquid buffer pressure transmission chamber (308) to enter the slow-release pressure accumulator chamber (310) at a flow rate greater than that within the low-sensitivity care opening range when the forearm support plate (101) is under pressure. This also increases the clamping response speed of the brake pad (302) to the brake follower disc (303), thereby increasing the pushing resistance of the walking wheel (102) when the forearm support plate (101) is subjected to a large downward pressure or continuous downward pressure.

10. The nursing assistance device according to claim 1, characterized in that: The valve body (305) is provided with a return spring (316) and a limiting step (317). The return spring (316) presses against the brake piston rod (306), so that the brake piston rod (306) abuts against the limiting step (317) in the initial state, and maintains a preset gap between the brake pad (302) and the brake follower disc (303).

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