A pulmonary function rehabilitation training device for pneumology patients

Abstract

The present application relates to the technical field of medical devices, and discloses a lung function rehabilitation training device for patients in a pneumology department, which comprises a shell, a blowing nozzle and a gas delivery pipe, the blowing nozzle is communicated with the inside of the shell through the gas delivery pipe; a resistance cylinder is arranged in the shell, the inside of the resistance cylinder is divided into a gas pressure cavity located at the lower part and a damping liquid cavity located at the upper part by a flexible isolation membrane, the gas delivery pipe is communicated with the gas pressure cavity; an upward circular-arc-shaped convex is arranged on the flexible isolation membrane, the convex surface of the circular-arc-shaped convex faces the damping liquid cavity; the inside of the damping liquid cavity is filled with a magneto-rheological fluid, a piston is movably arranged in the damping liquid cavity, the edge of the piston is in sealing sliding connection with the inner wall of the damping liquid cavity, a throttle hole penetrating through the piston along the axial direction is formed in the piston, the throttle hole is in a horn mouth structure, and the large end of the horn mouth faces the bottom of the damping liquid cavity. The present application realizes stepless self-adaptive control of exhalation resistance, accurate quantification of rehabilitation parameters, has multiple safety protections, and is suitable for various respiratory patients.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a pulmonary function rehabilitation training device for respiratory patients. Background Technology

[0002] The pulmonary function rehabilitation trainer is a specialized medical device used in respiratory clinics to conduct respiratory rehabilitation training for patients with post-pulmonary surgery, chronic obstructive pulmonary disease, lung injury, and respiratory muscle weakness. Its core principle is to exercise the intercostal muscles, diaphragm, and other respiratory muscle groups by applying controllable expiratory resistance, thereby gradually improving the patient's vital capacity, pulmonary ventilation capacity, and airway endurance, improving pulmonary ventilation and gas exchange function, shortening the recovery period of lung injury, and providing standardized training methods for long-term home rehabilitation of chronic respiratory diseases.

[0003] Currently available pulmonary function rehabilitation training equipment still suffers from several technical shortcomings. Existing equipment mostly employs mechanical resistance structures such as spring-loaded positions and fixed flow-limiting orifices, offering only multiple fixed resistance levels and failing to achieve continuous, stepless, and precise adjustment. The resistance value remains constant during training, unable to dynamically match the training intensity based on the patient's real-time expiratory force. If the fixed resistance is too high, the patient's expiratory burden is excessive, easily leading to chest tightness, shortness of breath, excessive fatigue of the respiratory muscles, and even exacerbating lung discomfort. If the resistance is too low, the training stimulation is insufficient, failing to effectively exercise the respiratory muscle groups, significantly prolonging the rehabilitation period, and making it difficult to adapt to the differentiated training needs of patients with different pulmonary function levels, such as those with mild cases, post-operative recovery, and severe COPD.

[0004] Traditional equipment often relies on the floating height of the airway float to roughly estimate ventilation volume, lacking high-precision air pressure and airflow sensor modules. This makes it impossible to collect core pulmonary function indicators such as airway pressure, single expiratory volume, and expiratory flow in real time and accurately. Furthermore, the equipment lacks automatic storage and statistical functions for training data, failing to record rehabilitation data such as daily training frequency, single training duration, and peak expiratory volume. Medical staff can only rely on patients' subjective descriptions to assess recovery, lacking objective quantitative data support, making it difficult to accurately evaluate patients' progress and adjust personalized rehabilitation training plans in a timely manner. Summary of the Invention

[0005] To address the aforementioned shortcomings in the existing technology, the present invention provides a pulmonary function rehabilitation trainer for respiratory patients, which solves the problems of existing pulmonary function rehabilitation trainers being unable to dynamically and accurately adjust the damping based on the patient's real-time respiratory pressure zones, and having a coarse detection method for ventilation parameters.

[0006] To achieve the above-mentioned objectives, the technical solution adopted by the present invention is as follows: a pulmonary function rehabilitation training device for respiratory patients, characterized in that it includes a shell, an air nozzle and an air supply tube, wherein the air nozzle is connected to the interior of the shell through the air supply tube;

[0007] The shell contains a resistance cylinder, which is divided into a lower air pressure chamber and an upper damping liquid chamber by a flexible isolation membrane. The air supply pipe is connected to the air pressure chamber. The flexible isolation membrane has an upward-facing arc-shaped protrusion with the convex surface of the arc-shaped protrusion facing the damping liquid chamber.

[0008] The damping fluid chamber is filled with magnetorheological fluid, and a piston is also installed inside the damping fluid chamber. The edge of the piston is sealed and slidably connected to the inner wall of the damping fluid chamber. A throttling orifice is opened on the piston and passes through the piston along the axis. The throttling orifice has a flared structure, with the large end of the flared orifice facing the bottom of the damping fluid chamber.

[0009] The resistance cylinder has a first coil segment and a second coil segment wound around its outer side. The first coil segment and the second coil segment are wound in a spiral shape along the circumference of the resistance cylinder on the outer wall of the resistance cylinder, and the first coil segment is located above the second coil segment.

[0010] A pressure sensor is installed on the gas pipeline, and a controller is installed inside the housing. The pressure sensor, the first coil segment, and the second coil segment are all electrically connected to the controller. The controller is configured to independently adjust the current of the first coil segment and the second coil segment according to the pressure signal detected by the pressure sensor.

[0011] Furthermore, in the aforementioned pulmonary function rehabilitation training device for respiratory patients, a piston rod is fixedly provided on the top of the piston, the top end of the piston rod extends to the outside of the resistance cylinder, and a return spring is provided in the damping liquid chamber located above the piston. The return spring is sleeved on the piston rod, and the two ends of the return spring abut against the top of the piston and the top wall of the damping liquid chamber, respectively.

[0012] Furthermore, in the aforementioned respiratory patient pulmonary function rehabilitation training device, the inner wall of the resistance cylinder is provided with an annular step, and the outer edge of the flexible isolation membrane is clamped and fixed on the annular step.

[0013] Furthermore, in the aforementioned pulmonary function rehabilitation training device for respiratory patients, the throttle orifices are evenly distributed in a circle around the central axis of the piston, and the ratio of the diameter of the small end to the diameter of the large end of the flare is between 1:2 and 1:3.

[0014] Furthermore, in the aforementioned pulmonary function rehabilitation training device for respiratory patients, a first annular groove and a second annular groove are respectively formed on the outer wall of the resistance cylinder at the positions corresponding to the first coil segment and the second coil segment. The first coil segment is wound in the first annular groove, and the second coil segment is wound in the second annular groove.

[0015] Furthermore, in the aforementioned pulmonary function rehabilitation training device for respiratory patients, the outer surfaces of the first and second annular grooves are covered with an epoxy resin potting layer, which is used to insulate and fix the first and second coil segments.

[0016] Furthermore, in the aforementioned respiratory patient pulmonary function rehabilitation training device, a pressure relief valve is connected to the bottom of the air pressure chamber. The pressure relief valve is electrically connected to the controller. When the air pressure detected by the air pressure sensor exceeds a preset safety threshold, the controller controls the pressure relief valve to open and release air pressure.

[0017] Furthermore, in the aforementioned respiratory patient pulmonary function rehabilitation training device, the end of the air delivery tube near the mouthpiece is equipped with a one-way valve and a filter screen. The one-way valve only allows gas to flow unidirectionally from the mouthpiece to the pressure chamber.

[0018] Furthermore, in the aforementioned pulmonary function rehabilitation training device for respiratory patients, the portion of the piston rod extending outside the resistance cylinder is covered with a corrugated sealing tube. One end of the corrugated sealing tube is fixedly connected to the top of the piston rod, and the other end of the corrugated sealing tube is sealed and fixedly connected to the top wall of the resistance cylinder.

[0019] Furthermore, the aforementioned respiratory patient pulmonary function rehabilitation training device has a display screen on the outside of the shell, and a battery inside the shell to power the controller, air pressure sensor, first coil segment, second coil segment and display screen. The display screen is electrically connected to the controller and is used to display real-time respiratory air pressure value and training number.

[0020] The beneficial effects of this invention are as follows: This invention addresses the shortcomings of traditional rehabilitation training devices, such as fixed resistance levels, coarse parameter detection, and insufficient protection. It adopts a magnetorheological fluid dual-coil zoned electronically controlled resistance adjustment structure, combined with a closed-loop air pressure sensor, multi-layer sealing, and integrated safety protection design, to achieve stepless adaptive adjustment of expiratory resistance and precise quantification of rehabilitation data. It is suitable for both clinical and home use, and the rehabilitation effect, safety, and adaptability are all improved.

[0021] This invention features independently controllable first and second coil segments on the outer wall of the resistance cylinder. These segments, along with a gas pressure sensor in the gas delivery tube and a controller, form a closed-loop electronic control system. The current in the two coil segments is adjusted according to the real-time expiratory pressure, thereby changing the viscosity of the magnetorheological fluid. This eliminates the need for traditional mechanical fixed-level resistance, achieving continuous, stepless, and dynamic adaptation of resistance to the patient's expiratory force. This avoids respiratory fatigue or insufficient training caused by resistance discomfort. The dual-coil zoned magnetic control significantly widens the resistance adjustment range, making it suitable for patients with different lung functions, including those with mild COPD, post-operative COPD, and severe COPD. The control precision is high, and manual adjustment is unnecessary, making operation simpler.

[0022] The resistance cylinder features an annular stepped clamping mechanism that separates the air pressure chamber from the damping liquid chamber with a flexible, arc-shaped convex membrane. The arc-shaped convex membrane ensures uniform pressure transmission, stable deformation without stress damage, and the annular stepped clamping seal prevents delamination and leakage, extending the lifespan of the sealing structure and reducing maintenance costs. The piston circumference is adorned with 1:2 to 1:3 ratio flared orifices, ensuring uniform and stable liquid flow while balancing damping adjustment range and exhalation smoothness, thus optimizing the training experience.

[0023] The piston is equipped with a return spring to achieve automatic return to its original position after a single training session. The extended section of the piston rod is equipped with a corrugated sealing tube to isolate moisture and dust, prevent magnetorheological fluid contamination and coil short circuits due to moisture, and ensure the long-term stable operation of the core components. The coil is housed in an annular groove and covered with an epoxy resin potting layer, making the coil less prone to displacement, insulating and waterproof, and greatly improving electrical safety and environmental adaptability.

[0024] The air pressure chamber is equipped with an electrically controlled pressure relief valve, which automatically releases pressure when the air pressure exceeds the standard, preventing high pressure from damaging the patient's airway and lungs, thus creating active safety protection; the front end of the air delivery tube integrates a filter and a one-way valve to filter sputum impurities to prevent tube blockage, while blocking airflow backflow, protecting the sensor and preventing coughing contamination, thus reducing the frequency of equipment failure.

[0025] The casing is equipped with a display screen and a built-in battery, which displays the exhalation pressure and number of training sessions in real time, providing objective and quantitative rehabilitation data to facilitate medical staff to accurately assess recovery progress and customize training programs. The battery-powered design eliminates the need for an external power source. The device is compact and integrated, and the mouthpiece can be quickly disassembled and sterilized, simplifying the assembly process and reducing mass production and maintenance costs. It is suitable for portable training in wards and at home. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the cross-sectional structure of the device;

[0027] Figure 2 This is a schematic diagram of the internal structure of the device;

[0028] Figure 3 This is a schematic diagram of the external structure of the resistance cylinder;

[0029] Figure 4 This is a schematic diagram of the bottom structure of the piston;

[0030] Figure 5 This is a schematic diagram of the air nozzle and air delivery tube.

[0031] The components are as follows: 1. Housing, 2. Air nozzle, 3. Air supply pipe, 4. Resistance cylinder, 5. Flexible isolation membrane, 6. Air pressure chamber, 7. Damping fluid chamber, 8. Arc-shaped protrusion, 9. Magnetorheological fluid, 10. Piston, 11. Throttling orifice, 12. First coil segment, 13. Second coil segment, 14. Air pressure sensor, 15. Controller, 16. Piston rod, 17. Return spring, 18. Annular step, 19. First annular groove, 20. Second annular groove, 21. Pressure relief valve, 22. One-way valve, 23. Filter screen, 24. Corrugated sealing tube, 25. Display screen, 26. Battery. Detailed Implementation

[0032] The specific embodiments of the present invention are described below to enable those skilled in the art to understand the present invention. However, it should be understood that the present invention is not limited to the scope of the specific embodiments. For those skilled in the art, various changes are obvious as long as they are within the spirit and scope of the present invention as defined and determined by the appended claims. All inventions utilizing the concept of the present invention are protected.

[0033] like Figures 1-5 As shown, this embodiment discloses a pulmonary function rehabilitation training device for respiratory patients. The device consists of three main external components: a shell 1, an air nozzle 2, and an air delivery tube 3. The air nozzle 2 is connected to the internal cavity of the shell 1 in a sealed manner through the air delivery tube 3. When the patient uses the device, he / she exhales into the air nozzle 2. The airflow is introduced into the resistance cylinder 4 inside the shell 1 through the air delivery tube 3. The resistance cylinder 4 relies on the magnetorheological fluid 9 inside the cylinder in conjunction with the electromagnetic coil to generate graded adjustable expiratory damping, thereby realizing pulmonary function rehabilitation training that dynamically adapts to the patient's expiratory force. The shell 1 is equipped with a complete set of supporting structures for air pressure sensing and acquisition, electronic control adjustment, safety pressure relief, and power supply display, which fully realizes the functions of real-time air pressure detection, stepless zoned control of damping, visualization of training data, and overpressure safety protection.

[0034] The housing 1 is a sealed vertical cylindrical protective shell. A resistance cylinder 4 is fixedly installed at the center of the inner cavity of the housing 1. The resistance cylinder 4 is a vertically arranged cylindrical sealed cavity structure. An annular step 18 is integrally formed in the middle of the inner wall of the resistance cylinder 4. The annular step 18 is used to clamp and fix the outer edge of the flexible isolation membrane 5. After the flexible isolation membrane 5 is pressed and sealed by the annular step 18, the inner cavity of the resistance cylinder 4 is completely divided into two independent sealed chambers in the horizontal direction. The chamber located below the flexible isolation membrane 5 is defined as the air pressure chamber 6, and the chamber located above the flexible isolation membrane 5 is defined as the damping liquid chamber 7. The end of the air delivery pipe 3 away from the mouthpiece 2 passes through the side wall of the housing 1 and is sealed and connected to the lower part of the side wall of the air pressure chamber 6, ensuring that the patient's exhaled airflow can completely enter the interior of the air pressure chamber 6. The flexible isolation membrane 5 has an integrally formed arc-shaped protrusion 8 with an upward arched cross section in the middle. The convex surface of the arc-shaped protrusion 8 faces the damping liquid cavity 7. When exhaled airflow is introduced into the air pressure cavity 6 and the air pressure increases, the air pressure in the air pressure cavity 6 will act evenly on the lower surface of the flexible isolation membrane 5, pushing the arc-shaped protrusion 8 to undergo elastic deformation upward toward the damping liquid cavity 7, thereby squeezing the magnetorheological fluid 9 filled inside the damping liquid cavity 7 to flow upward.

[0035] The damping fluid chamber 7 is completely filled with magnetorheological fluid 9. A piston 10 is vertically mounted inside the damping fluid chamber 7. The piston 10 is a circular flat plate structure. A sealing ring is used to achieve a sealed sliding connection between the outer peripheral wall of the piston 10 and the inner wall of the resistance cylinder 4. The piston 10 can slide up and down along the axial direction of the resistance cylinder 4 without leakage. Multiple throttling holes 11 are formed on the piston 10 plate, completely penetrating the piston 10 plate along its axial direction. All throttling holes 11 are evenly distributed circumferentially around the central axis of the piston 10. Each throttling hole 11 has a flared mouth structure. The large end of the structure faces the bottom of the damping fluid chamber 7. The ratio of the diameter of the small end to the large end of the throttling orifice 11 is set to a range of 1:2 to 1:3. In this embodiment, the preferred ratio is 1:2.5. When the flexible isolation membrane 5 pushes the magnetorheological fluid 9 upward, the magnetorheological fluid 9 can only flow through all the throttling orifices 11 from the lower chamber of the piston 10 to the upper chamber of the piston 10. The gradually changing flared structure of the throttling orifice 11 can stably control the basic fluid flow resistance when the magnetorheological fluid 9 passes through, and together with the rheological characteristics of the magnetorheological fluid 9, it realizes the basic damping adjustment benchmark.

[0036] A piston rod 16 is vertically fixed to the center of the top surface of the piston 10. The piston rod 16 extends vertically upwards, and its top end penetrates the top wall of the damping fluid chamber 7 and extends to the external space of the resistance cylinder 4. A return spring 17 is sleeved on the outside of the piston rod 16 located above the piston 10 and inside the damping fluid chamber 7. The upper and lower ends of the return spring 17 are in close contact with the top surface of the piston 10 and the inner wall of the top wall of the damping fluid chamber 7, respectively. When the air pressure inside the air pressure chamber 6 disappears and the flexible isolation membrane 5 returns to its downward position, the return spring 17 returns to its original position due to its own elastic thrust. The piston 10 is pushed down to reset, completing the structural return to its original position after a single exhalation training. The piston rod 16 extends to the outside of the resistance cylinder 4 and is entirely covered by a corrugated sealing tube 24. The corrugated sealing tube 24 is a retractable pleated sealing structure. The lower end of the corrugated sealing tube 24 is sealed and fixed to the outer wall of the top of the piston rod 16, and the upper end of the corrugated sealing tube 24 is sealed and fixed to the outer wall of the top of the resistance cylinder 4. The corrugated sealing tube 24 completely covers the exposed section of the piston rod 16 to prevent external dust and moisture from entering the damping fluid chamber 7, while not restricting the vertical extension and sliding of the piston rod 16.

[0037] Two annular grooves are formed axially on the outer wall of the resistance cylinder 4: a first annular groove 19 at the top and a second annular groove 20 at the bottom. The first annular groove 19 and the second annular groove 20 are arranged around the circumference of the resistance cylinder 4. A first coil segment 12 is spirally wound inside the first annular groove 19, and a second coil segment 13 is spirally wound inside the second annular groove 20. The first coil segment 12 is positioned above the second coil segment 13. Both coil segments are tightly spirally wound around the circumference of the outer wall of the resistance cylinder 4. After the coils are wound in the first annular groove 19 and the second annular groove 20, the two annular grooves... The outside of the tank is completely covered with an epoxy resin potting layer, which completely encapsulates the first coil segment 12 and the second coil segment 13, achieving insulation, waterproofing, vibration protection and fixation of the two coil segments, preventing short circuits, displacement and leakage during coil operation; after the first coil segment 12 and the second coil segment 13 are energized, they can form independent and controllable magnetic fields in the upper and lower regions inside the resistance cylinder 4, respectively. The magnetic field acts on the magnetorheological fluid 9 in the damping liquid chamber 7. By changing the magnetic field strength, the viscosity of the magnetorheological fluid 9 is adjusted, thereby changing the flow resistance of the magnetorheological fluid 9 through the throttling orifice 11, realizing graded and fine control of exhalation resistance.

[0038] A pressure sensor 14 is installed in the middle section of the gas delivery tube 3. The pressure sensor 14 is in direct contact with the airflow channel inside the gas delivery tube 3, and can continuously collect the real-time pressure value inside the gas delivery tube 3 during the patient's exhalation. A controller 15 is fixedly installed on the bottom side inside the housing 1. The pressure sensor 14, the first coil segment 12, and the second coil segment 13 are all electrically connected to the controller 15 through wires. The controller 15 has a data processing program preset inside. The controller 15 is configured to receive the pressure detection signal transmitted by the pressure sensor 14 in real time, and independently and without coupling adjust the current of the first coil segment 12 and the second coil segment 13 according to the real-time pressure value. By changing the current of the two coil segments respectively, the strength of the magnetic field in the upper and lower sections can be independently controlled, and the overall rheological resistance of the magnetorheological fluid 9 can be precisely adjusted.

[0039] The bottom side wall of the air pressure chamber 6 has an opening for connecting the pressure relief valve 21. The pressure relief valve 21 is also electrically connected to the controller 15. The controller 15 has pre-stored air pressure safety threshold parameters. When the air pressure value collected in real time by the air pressure sensor 14 exceeds the preset safety threshold, the controller 15 automatically outputs a control signal to drive the pressure relief valve 21 to open. The high-pressure gas inside the air pressure chamber 6 is discharged outward through the pressure relief valve 21, quickly reducing the air pressure inside the chamber and avoiding the risk of lung damage due to excessive air pressure. When the air pressure drops back to the safe range, the controller 15 controls the pressure relief valve 21 to automatically close, restoring the equipment to normal training status.

[0040] One-way valve 22 and filter screen 23 are sequentially installed on the end of the air supply tube 3 near the mouthpiece 2. The filter screen 23 is arranged close to the air inlet end of the mouthpiece 2 to filter saliva, sputum, dust and impurities in the patient's exhaled airflow, so as to prevent impurities from entering the air supply tube 3 and the resistance cylinder 4 and causing pipeline blockage and magnetorheological fluid contamination. The one-way valve 22 is arranged between the filter screen 23 and the pressure sensor 14. The conduction direction of the one-way valve 22 only allows gas to flow unidirectionally from the mouthpiece 2 to the pressure chamber 6, blocking the reverse flow of airflow and preventing the pressure in the damping fluid chamber 7 from impacting the patient's airway in reverse. At the same time, it prevents the magnetorheological fluid and gas in the chamber from flowing back to the mouthpiece 2 and causing contamination.

[0041] A display screen 25 is embedded in the outer wall of the housing 1, and a storage battery 26 is fixedly installed at the bottom of the interior of the housing 1. The storage battery 26 provides unified power to all electrical components of the equipment, including the controller 15, the air pressure sensor 14, the first coil segment 12, the second coil segment 13, and the display screen 25. The display screen 25 is electrically connected to the controller 15. The controller 15 receives the air pressure data collected by the air pressure sensor 14 in real time and counts the number of single and daily training sessions. The real-time respiratory air pressure value and the cumulative number of training sessions are synchronously transmitted to the display screen 25 for visualization. Medical staff and patients can intuitively read the quantitative data of rehabilitation training without relying on subjective feelings to judge the training intensity.

[0042] After the complete assembly of this embodiment, the complete workflow for the patient's pulmonary function rehabilitation training is as follows: The patient exhales continuously with their lips pressed against the mouthpiece 2. The exhaled airflow passes through the filter screen 23 to filter impurities and then flows into the air delivery tube 3 through the one-way valve 22. When the airflow passes through the pressure sensor 14, the pressure sensor 14 collects the current exhaled air pressure in real time and transmits the pressure signal to the controller 15. The airflow continues to flow into the pressure chamber 6, causing the air pressure inside the chamber to increase. This pushes the arc-shaped protrusion 8 in the middle of the flexible isolation membrane 5 upward, causing it to undergo upward elastic deformation. The arc-shaped protrusion 8 compresses the damping liquid chamber 7. The magnetorheological fluid 9 flows upwards, and can only pass through the piston 10 through the evenly distributed flared orifices 11 on the piston 10. The liquid resistance generated by the flow of the magnetorheological fluid acts in the opposite direction on the flexible isolation membrane 5, and is ultimately converted into training resistance that the patient needs to overcome when exhaling. The controller 15 independently adjusts the current of the first coil segment 12 and the second coil segment 13 according to the real-time received air pressure signal. After the current of the two coil segments is changed, magnetic fields of different intensities are generated in the upper and lower regions of the damping liquid chamber 7, respectively. The magnetic field synchronously changes the viscosity of the magnetorheological fluid 9. When the viscosity increases, the magnetorheological fluid passes through... As the flow resistance through the orifice 11 increases, the resistance to the patient's expiratory training also increases. Conversely, as the viscosity decreases, the expiratory resistance decreases. Continuous, stepless, and dynamic adjustment of resistance is achieved through independent magnetic control of dual coil zones, allowing for real-time matching and adaptation of training intensity to the patient's expiratory force. After a single exhalation, the internal pressure of the pressure chamber 6 gradually decreases, the return spring 17 pushes the piston 10 downwards to reset, the flexible isolation membrane 5 rebounds downwards due to its own elasticity, and the magnetorheological fluid 9 flows back to the chamber below the piston 10, completing one complete expiratory training cycle. The controller 15 simultaneously accumulates the number of training sessions and updates the real-time pressure and training data. The number of repetitions is transmitted to the display screen 25 for real-time display; if the patient exhales too forcefully, the air pressure sensor 14 detects that the air pressure exceeds the safety threshold, and the controller 15 immediately opens the pressure relief valve 21 to release pressure in the air pressure chamber 6, reducing airway pressure and protecting the patient's lungs; throughout the training process, the filter screen 23 continuously blocks dirt, the one-way valve 22 prevents airflow backflow, the corrugated sealing tube 24 ensures the airtightness of the damping liquid chamber 7 during the extension and retraction of the piston rod 16, the epoxy resin potting layer continuously protects the two electromagnetic coils for stable operation, and the battery 26 continuously powers the device, allowing rehabilitation training to be completed independently at home without an external power source.

[0043] This embodiment uses a barometric pressure sensor to collect expiratory pressure in real time. The controller independently adjusts the current zones of the upper and lower coils to control the magnetic field strength of the magnetorheological fluid. The variable viscosity of the magnetorheological fluid, combined with the throttling orifice at the flared end, forms the basic liquid damping, overcoming the shortcomings of traditional mechanical resistance settings that cannot be continuously and dynamically adjusted. It can adaptively match the training resistance according to the patient's real-time expiratory force, and the resistance can be finely adjusted to suit patients with different lung function levels, such as those with mild postoperative symptoms and severe COPD. This avoids the problem of excessive training burden or insufficient stimulation caused by fixed resistance, thus shortening the rehabilitation period.

[0044] The device integrates a pressure sensing module, a display screen, and data statistics functions. It can quantitatively display expiratory pressure and cumulative training times in real time, providing objective and recordable quantitative rehabilitation data. Medical staff can accurately assess the patient's stage of lung function recovery based on the stored data and adjust personalized rehabilitation plans accordingly, overcoming the shortcomings of traditional float-type devices that are crude in detection and lack quantitative data support.

[0045] The flexible isolation membrane, combined with the arc-shaped protrusion structure, ensures uniform deformation and force distribution, allowing for smooth transmission of internal air pressure to the magnetorheological fluid. The annular step clamps and fixes the isolation membrane, ensuring no leakage during long-term use. The gradually tapered horn-shaped throttling orifices evenly distributed around the piston circumference stably control the flow resistance of the liquid base, and the orifice ratio of 1:2 to 1:3 balances the damping adjustment range with the smoothness of airflow.

[0046] The pressure relief valve, check valve, filter screen, corrugated sealing tube, and epoxy resin potting layer form a multi-layer safety protection structure. Overpressure is automatically relieved to avoid lung damage, the check valve blocks backflow, the filter screen isolates contaminants, and the sealing tube and potting layer ensure long-term sealed and stable operation of the cavity and coil, resulting in a longer equipment lifespan and higher safety for home use.

Claims

1. A pulmonary function rehabilitation training device for respiratory patients, characterized in that, It includes a housing (1), an air nozzle (2) and an air supply pipe (3), wherein the air nozzle (2) is connected to the interior of the housing (1) through the air supply pipe (3); The housing (1) is equipped with a resistance cylinder (4). The resistance cylinder (4) is divided into a lower air pressure chamber (6) and an upper damping liquid chamber (7) by a flexible isolation membrane (5). The air supply pipe (3) is connected to the air pressure chamber (6). The flexible isolation membrane (5) is provided with an arc-shaped protrusion (8) with an upward cross section. The convex surface of the arc-shaped protrusion (8) faces the damping liquid chamber (7). The damping fluid cavity (7) is filled with magnetorheological fluid (9). A piston (10) is also movably installed in the damping fluid cavity (7). The edge of the piston (10) is slidably connected to the inner wall of the damping fluid cavity (7). A throttling hole (11) is opened on the piston (10) and passes through the piston (10) axially. The throttling hole (11) has a flared structure, and the large end of the flared hole faces the bottom of the damping fluid cavity (7). The resistance cylinder (4) is wound with a first coil segment (12) and a second coil segment (13). The first coil segment (12) and the second coil segment (13) are wound in a spiral shape on the outer wall of the resistance cylinder (4) along the circumferential direction, and the first coil segment (12) is located above the second coil segment (13). A pressure sensor (14) is provided on the gas pipe (3), and a controller (15) is provided inside the housing (1). The pressure sensor (14), the first coil segment (12), and the second coil segment (13) are all electrically connected to the controller (15). The controller (15) is configured to independently adjust the energizing current of the first coil segment (12) and the second coil segment (13) according to the pressure signal detected by the pressure sensor (14).

2. The pulmonary function rehabilitation training device for respiratory patients according to claim 1, characterized in that, A piston rod (16) is fixedly provided on the top of the piston (10). The top end of the piston rod (16) extends to the outside of the resistance cylinder (4). A return spring (17) is provided in the damping fluid chamber (7) above the piston (10). The return spring (17) is sleeved on the piston rod (16), and the two ends of the return spring (17) abut against the top of the piston (10) and the top wall of the damping fluid chamber (7), respectively.

3. The pulmonary function rehabilitation training device for respiratory patients according to claim 1, characterized in that, The inner wall of the resistance cylinder (4) is provided with an annular step (18), and the outer edge of the flexible isolation membrane (5) is clamped and fixed on the annular step (18).

4. The pulmonary function rehabilitation training device for respiratory patients according to claim 1, characterized in that, The throttling orifice (11) is evenly distributed in a circle around the central axis of the piston (10), and the ratio of the small end diameter to the large end diameter of the flared mouth is between 1:2 and 1:

3.

5. The pulmonary function rehabilitation training device for respiratory patients according to claim 1, characterized in that, The outer wall of the resistance cylinder (4) is provided with a first annular groove (19) and a second annular groove (20) corresponding to the positions of the first coil segment (12) and the second coil segment (13), respectively. The first coil segment (12) is wound in the first annular groove (19), and the second coil segment (13) is wound in the second annular groove (20).

6. The pulmonary function rehabilitation training device for respiratory patients according to claim 5, characterized in that, The first annular groove (19) and the second annular groove (20) are covered with an epoxy resin potting layer to insulate and fix the first coil segment (12) and the second coil segment (13).

7. The pulmonary function rehabilitation training device for respiratory patients according to claim 1, characterized in that, The bottom of the air pressure chamber (6) is connected to a pressure relief valve (21), which is electrically connected to the controller (15). When the air pressure detected by the air pressure sensor (14) exceeds the preset safety threshold, the controller (15) controls the pressure relief valve (21) to open for exhaust and pressure relief.

8. The pulmonary function rehabilitation training device for respiratory patients according to claim 1, characterized in that, The gas supply pipe (3) is provided with a one-way valve (22) and a filter screen (23) at one end near the air nozzle (2). The one-way valve (22) only allows gas to flow unidirectionally from the air nozzle (2) to the air pressure chamber (6).

9. The pulmonary function rehabilitation training device for respiratory patients according to claim 2, characterized in that, The portion of the piston rod (16) extending to the outside of the resistance cylinder (4) is covered with a corrugated sealing tube (24). One end of the corrugated sealing tube (24) is fixedly connected to the top end of the piston rod (16), and the other end of the corrugated sealing tube (24) is sealed and fixedly connected to the top wall of the resistance cylinder (4).

10. The pulmonary function rehabilitation training device for respiratory patients according to claim 1, characterized in that, The outer side of the housing (1) is provided with a display screen (25), and the inside of the housing (1) is provided with a battery (26) that supplies power to the controller (15), the air pressure sensor (14), the first coil segment (12), the second coil segment (13) and the display screen (25). The display screen (25) is electrically connected to the controller (15) and is used to display the real-time breathing air pressure value and the number of training sessions.

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