WO2025241301A1 - Spontaneous breathing machine - Google Patents

Abstract

A spontaneous breathing machine for use in a routine pulmonary function test, the spontaneous breathing machine comprising a housing, wherein a gripping part is provided at the bottom end of the housing, a countdown switch is provided on an upper end surface of the housing, a bidirectional Venturi tube is embedded in a lateral vertical surface on a side of the housing, an airflow input port is formed in a side of the bidirectional Venturi tube, and a display is further arranged on the housing; an operating system is arranged inside the housing and comprises a processor, a differential operational amplifier, a differential pressure sensor and a power supply; and the differential pressure sensor comprises a first pressure sensor and a second pressure sensor which are both in communication with an airflow output port of the bidirectional Venturi tube via the airflow input port. The provision of a plurality of differential pressure sensors realizes respiration monitoring. The differential pressure sensors can measure the flow rate and the volume of a gas passing through the apparatus during breathing, and have the function of precise respiratory data acquisition and the advantage of portability.

Description

Free ventilator Technical Field

This invention relates to the field of respiratory monitoring technology, and more particularly to a free-ventilator.

Background Technology

Research shows that in 2018, the incidence of COPD in people aged 40 and above in China reached 13.7%. Even more alarming is the increasing number of young people being diagnosed with COPD, bringing the total number of COPD patients in China to approximately 100 million. In 2013, the total number of deaths from COPD was approximately 910,000, ranking third among individual diseases and accounting for 31.1% of global COPD-related deaths. With the arrival of the post-pandemic era, many people are troubled by prolonged COVID-19 symptoms or anxiety; some fitness enthusiasts hope to improve their exercise endurance through professional and scientific guidance; and healthy individuals need to monitor their respiratory health to achieve early treatment of diseases. Therefore, there is an urgent need for a simple, portable, and cost-effective respiratory monitoring product to meet the health and quality-of-life needs of different groups.

A portable respiratory monitor is a device used to monitor an individual's respiratory function, typically in the medical, health, and sports fields. Portable respiratory monitors generally use sensor technology, employing multiple sensors to detect and record respiratory activity. These sensors can include differential pressure sensors, flow sensors, temperature sensors, and optical sensors, used to measure parameters such as respiratory airflow, chest and abdominal movements.

Most existing respiratory monitoring devices on the market use flow measurement technology. However, for COPD patients, those with poor lung function, or those experiencing acute exacerbations, the ability to perform forced breathing is often insufficient, thus failing to meet the needs of monitoring and assessing their condition. Therefore, we propose a self-ventilating device.

Summary of the Invention

The purpose of this invention is to overcome the shortcomings of the prior art, adapt to practical needs, and provide a free ventilator to solve the technical problem that people with poor lung function or acute attacks are unable to perform forceful breathing operations, thus failing to meet the needs of detection and assessment of their condition.

To achieve the objective of this invention, the technical solution adopted is as follows: a free breathing machine is designed, including a housing, a gripping part is arranged at the bottom of the housing, a power switch and a memory card slot are respectively arranged on the upper surface of the housing, a charging port is arranged on the lower surface of the housing, a bidirectional Venturi effect tube is embedded on one side of the housing, an airflow inlet is arranged on the side of the housing where the bidirectional Venturi effect tube is located, a display is also arranged on the housing, a countdown switch is arranged on the first side of the housing, and the memory card slot is used to store the output data in the memory card;

An operating system is arranged inside the housing. The operating system includes a processor, a differential operational amplifier, a differential pressure sensor, and a power supply. The power supply is electrically connected to the processor. The input terminal of the differential operational amplifier is connected to the output terminal of the differential pressure sensor. The input terminal of the processor is connected to the output terminal of the differential operational amplifier. The input terminal of the display is connected to the output terminal of the processor.

The differential pressure sensor includes a first pressure sensor and a second pressure sensor, both of which are connected to the airflow output port on the bidirectional Venturi effect tube via airflow inlet.

In one possible implementation, an arc-shaped plate is connected to the upper part of the housing, and a combined plate is fixedly connected to the lower part of the housing. The arc-shaped plate and the combined plate are combined to form a mounting cavity with an arc structure, and the bidirectional Venturi effect tube is installed in the mounting cavity.

In one possible implementation, the memory card slot is electrically connected to the processor via an extended memory.

In one possible implementation, the housing is also provided with a USB port, which is electrically connected to the processor via a data input/output module, and is used for data output and charging.

In one possible implementation, the housing is further provided with a digital converter interface, which is electrically connected to the processor via a digital-to-analog converter.

In one possible implementation, the bidirectional Venturi effect tube includes a cylindrical body with two openings, a narrow section at the centerline of the cylindrical body dividing the cylindrical body into two interconnected left cavities and right cavities, with a proximal vent above the left cavity and a distal vent above the right cavity.

In one possible implementation, the leftmost side of the left cavity is stepped to facilitate the insertion of the filter tip.

In one possible implementation, the airflow inlet includes a first airflow inlet and a second airflow inlet; the first airflow inlet corresponds to the left cavity; and the second airflow inlet corresponds to the right cavity.

In one possible implementation, the first airflow inlet is connected to a first pressure sensor; the second airflow inlet is connected to a second pressure sensor.

In one possible implementation, the stepped opening is provided with a guide ramp for guiding the insertion of the filter tip into the stepped interior.

In one possible implementation, the stepped inner surface is provided with a positioning groove, and the filter nozzle is provided with a positioning block corresponding to the positioning groove, for positioning and installing the filter nozzle in the left cavity.

In one possible implementation, the surface of the grip portion is provided with an anti-slip texture to improve the gripping effect.

In one possible implementation, the anti-slip texture is any one or more of a wavy, dotted, or mesh pattern.

In one possible implementation, the surface of the grip portion is fitted with an anti-slip layer to improve the gripping effect.

In one possible implementation, the anti-slip layer is a rubber layer or a silicone layer.

In one possible implementation, the countdown switch further includes a status indicator light, which is disposed on a first side of the housing and is electrically connected to the countdown switch.

In one possible implementation, a locking element is provided between the arc-shaped plate and the combined plate. The locking element is used to fix the bidirectional Venturi effect tube in the mounting cavity. The locking element is an elastic buckle or an elastic strap.

In one possible implementation, locking rings are provided at both ends of the mounting cavity for positioning the bidirectional Venturi effect tube within the mounting cavity.

In one possible implementation, the grip portion is provided with a grip recess section corresponding to the gripping posture of a human hand, and the grip recess section is located in the middle of the grip portion.

In one possible implementation, the free ventilator further includes counterweights, a plurality of which are detachably mounted in the bottom of the grip portion for adjusting the center of gravity of the free ventilator in the gripped state.

Compared to existing technologies, this invention achieves respiratory monitoring by arranging multiple differential pressure sensors. These sensors measure the speed and volume of gas passing through the device during respiration. Each sensor comprises two or more sensors connected to the proximal and distal vents of a bidirectional Venturi effect tube. When airflow passes through the tube, a differential pressure is generated. The sensors measure this differential pressure to calculate the airflow speed and volume. The differential pressure sensors then convert this data into digital signals, which are input to a processor via a differential operational amplifier for processing and recording. This invention offers the advantages of accurate respiratory data acquisition and portability. It can accurately and in real-time monitor important respiratory parameters such as respiratory rate, respiratory depth, and respiratory frequency. Furthermore, users can carry it with them to perform lung function tests anytime, anywhere.

Attached Figure Description

Figure 1 is a schematic diagram of the overall structure of the present invention;

Figure 2 is one of the schematic diagrams of the shell structure of the present invention;

Figure 3 is a second schematic diagram of the shell structure of the present invention;

Figure 4 is a schematic cross-sectional view of the bidirectional Venturi effect tube in this invention;

Figure 5 is a schematic diagram of the differential pressure sensor detection circuit in this invention;

Figure 6 is a schematic diagram of a circuit according to an embodiment of the present invention;

In the diagram: 1. Housing; 2. Grip; 3. Power switch; 4. Bidirectional Venturi effect tube; 5. Gas... 6. Stream input port; 7. Display; 8. Processor; 9. Differential operational amplifier; 10. Differential pressure sensor; 11. Power supply; 12. Memory card slot; 13. Curved plate; 14. Combination board; 15. USB port; 16. Countdown switch;

401. Cylinder; 402. Narrow section; 403. Left side cavity; 404. Stepped shape; 405. Right side cavity; 406. Proximal vent; 407. Distal vent.

Detailed Implementation

The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

In the specification, claims, and accompanying drawings of this application, the use of terms such as "first" and "second" is for descriptive purposes only, to distinguish different objects, and not to describe a specific order. It should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated.

The use of "and/or" or "and/or" in the text implies three parallel options. For example, "A and/or B" could mean option A, option B, or a combination of both A and B.

The term "embodiment" in this document means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

The technical solution provided by the embodiments of this application can overcome the problem that the existing ventilators cannot perform forceful breathing operations for COPD patients, those with poor lung function, or those experiencing acute exacerbations, thus failing to meet the needs of detection and assessment of the condition.

See Figures 1 through 6.

Understandably, a ventilator is a device that can replace, control, or alter a person's normal physiological breathing, increasing lung ventilation, improving respiratory function, reducing the work of breathing, and conserving cardiac reserve. During spontaneous ventilation, the inspiratory action creates negative pressure in the thoracic cavity, causing passive lung expansion and resulting in negative pressure in the alveoli and airways, thus creating a pressure difference between the airway opening and the alveoli to complete inhalation. After inhalation, the elastic recoil of the thoracic cavity and lungs creates the opposite pressure difference to complete exhalation. Therefore, normal breathing is achieved by the body creating an "active negative pressure difference" between the alveoli and airway opening through respiratory movements to complete inhalation, and by the elastic recoil of the thoracic cavity and lungs after inhalation creating a passive positive pressure difference between the alveoli and airway opening to exhalation, thus meeting the needs of physiological ventilation. In contrast, mechanical ventilation is driven by external machinery to create a positive pressure difference between the airway opening and the alveoli. Exhalation occurs when the external mechanical pressure is removed, causing the chest and lungs to elastically recoil and create a passive positive pressure difference between the alveoli and the airway opening. In other words, the respiratory cycle is completed by the presence of a "passive positive pressure difference".

Based on this, one embodiment of this application provides a free-flowing ventilator, including a housing 1. A gripping part 2 is arranged at the bottom of the housing 1. A power switch 3 and a memory card slot 11 are respectively arranged on the upper surface of the housing 1. A charging port is arranged on the lower surface of the housing 1. A bidirectional Venturi tube 4 is embedded in one side of the housing 1. An airflow inlet 5 is arranged on the side of the housing 1 where the bidirectional Venturi tube 4 is located. A display 6 is also arranged on the housing 1. A countdown switch 15 is arranged on the first side of the housing 1. An operating system is arranged inside the housing 1, including a processor 7 and a differential calculation function. The system includes an amplifier 8, a differential pressure sensor 9, and a power supply 10. The power supply 10 is electrically connected to the processor 7. The input terminal of the differential operational amplifier 8 is connected to the output terminal of the differential pressure sensor 9. The input terminal of the processor 7 is connected to the output terminal of the differential operational amplifier 8. The input terminal of the display 6 is connected to the output terminal of the processor 7. The memory card slot 11 is used to store the output data on the memory card. The differential pressure sensor 9 includes a first pressure sensor and a second pressure sensor. Both the first pressure sensor and the second pressure sensor are connected to the airflow output port on the bidirectional Venturi effect tube 4 through the airflow input port 5.

As shown in Figure 3, in one possible embodiment, the bidirectional Venturi effect tube 4 includes a cylindrical body 401 with two openings. A narrow section 402 is provided at the midline of the cylindrical body 401, dividing the cylindrical body 401 into two interconnected cavities: a left-side cavity 403 and a right-side cavity 405. A proximal air port 406 is connected above the left-side cavity 403, and a distal air port 407 is connected above the right-side cavity 405. In this configuration, the bidirectional Venturi effect tube 4 can help regulate the flow and pressure of the gas. The proximal air port 406 is connected to a gas source, and the distal air port 407 is connected to the patient's breathing interface. Through the action of the narrow section 402, appropriate airflow assistance is provided during the patient's inhalation, and a certain regulatory effect is also achieved during exhalation to improve the patient's respiratory condition.

Portable respiratory monitors are devices used to monitor an individual's respiratory function, commonly found in medical, health, and sports fields. Portable respiratory monitors typically utilize sensor technology, employing various sensors to detect and record respiratory activity. These sensors can include differential pressure sensors, flow sensors, temperature sensors, and optical sensors, used to measure parameters such as respiratory airflow, chest and abdominal movements. This embodiment differs from traditional pulmonary function monitors in that it eliminates the need for forced breathing in conventional operations, allowing for the measurement of the volume of air a subject can inhale and exhale in a resting state, measured in liters per second (L/s). In this application, the method for measuring flow velocity is based on one of the laws of fluid dynamics: the Venturi effect. According to the Venturi effect, when fluid flows through a pipe from a wider section to a narrower section, the fluid pressure decreases while the flow velocity increases. To satisfy the law of conservation of mass, the fluid velocity and pressure change; this change is described by the following equation, commonly known as the "Venturi effect equation."

Where _P1 and _P2 are the pressures on both sides of the larynx, d is the fluid density, and _v1 and _v2 are the velocities on both sides of the larynx. This invention utilizes a differential pressure sensor, which measures the speed and volume of gas passing through the device during respiration. It includes two or more sensors, respectively installed at the inlet and outlet of the bidirectional Venturi effect tube 4. In this embodiment, two sensors are arranged. When airflow flows from the left cavity 403 to the right cavity 405 (i.e., the subject blows air), the differential pressure sensor connected to the proximal air port senses the blowing pressure signal. When airflow flows from the right to the left (i.e., the subject inhales), the differential pressure sensor connected to the distal air port senses the inhalation pressure signal. The differential pressure sensor then converts this data into digital signals, which are input to the processor 7 for processing and recording via a differential operational amplifier 8.

In this embodiment, when the power supply 10 supplies power to the processor 7, the differential pressure sensor 9 collects pressure data, which is processed by the differential operational amplifier 8 and then transmitted to the processor 7. The data is then displayed on the display 6, and the relevant data can be stored in the memory card via the memory card slot 11 for easy subsequent analysis and viewing. For example, the user can conveniently operate the ventilator via the grip 2, and a stable airflow supply is achieved through the coordinated operation of the airflow inlet 5 and the bidirectional Venturi effect tube 4.

Specifically, when the user turns on the device power switch 3, the power supply 10 begins to supply power to the processor 7 and other components, enabling the entire system to start operating. During the operation of the ventilator, the bidirectional Venturi tube 4 draws in external air through the airflow inlet 5. The first and second pressure sensors monitor the airflow pressure in real time and transmit the monitored pressure data to the differential operational amplifier 8. The differential operational amplifier 8 amplifies and processes the input pressure data and transmits the result to the processor 7. The processor 7 analyzes and calculates the received data to obtain current airflow pressure, flow rate, and other parameters, and transmits these parameters to the display 6 for display, allowing the user or medical staff to understand the device's operating status in real time. Simultaneously, the memory card slot 11 stores the relevant data output by the processor 7 into an inserted memory card, facilitating subsequent analysis and review of data during use, and providing a basis for adjusting and optimizing treatment plans.

For example, in a hospital's intensive care unit, a patient with severe respiratory failure requires mechanical ventilation. Medical staff fully charge the ventilator via the charging port, turn on the power switch 3, and connect the breathing mask to the airflow outlet. The usage time and ventilation mode are set by adjusting the countdown switch 15. During use, the display 6 shows the patient's respiratory rate, tidal volume, airway pressure, and other parameters in real time. Medical staff adjust the ventilator parameters based on these parameters to ensure the patient receives optimal respiratory support. After use, the data on the memory card is exported for analysis of changes in the patient's respiratory status and evaluation of treatment effectiveness. In a home care scenario, a patient with chronic obstructive pulmonary disease (COPD) requires long-term home ventilator use for rehabilitation. When using the ventilator, the patient or their family first fully charges it via the charging port, then turns on the power switch 3 and selects the appropriate breathing mode and parameters. During use, the patient can monitor their breathing status at any time via the display 6. Family members can periodically bring the data from the memory card to the hospital for doctors to evaluate the patient's condition and treatment effectiveness, allowing for timely adjustments to the treatment plan.

In one possible implementation, individuals with poor lung function or experiencing acute exacerbations often cannot perform forceful breathing due to insufficient respiratory muscle strength and reduced lung compliance. To address this issue, the bidirectional Venturi effect tube 4 equipped with the free-flow ventilator in this embodiment can actively guide and regulate airflow. During the patient's inhalation phase, the bidirectional Venturi effect tube 4 generates negative pressure, actively drawing air in through the airflow inlet 5, helping the patient overcome inhalation difficulties caused by respiratory muscle weakness. Even if the patient's inhalation effort is very weak, the ventilator can quickly generate sufficient negative pressure to introduce air into the lungs, ensuring adequate oxygen supply. The first and second pressure sensors in the differential pressure sensor 9 can monitor airway pressure changes during breathing in real time and accurately. When insufficient inhalation effort is detected, the processor 7 adjusts the operating parameters of the bidirectional Venturi effect tube 4 in a timely manner based on the data fed back by the differential pressure sensor 9, increasing the inhalation assistance force to ensure smooth air entry into the lungs.

During the exhalation phase, the bidirectional Venturi effect tube 4 can appropriately reduce the pressure within the airway, helping patients to more easily expel carbon dioxide from their lungs. For patients with poor lung function, the lungs' elastic recoil ability is weakened, and spontaneous exhalation may be insufficient, leading to carbon dioxide retention. The active expiratory assist function of this ventilator can effectively avoid this situation and maintain the gas exchange balance in the patient's body.

Furthermore, through the coordinated operation of the processor 7 and the differential operational amplifier 8 within the operating system, the intensity and frequency of respiratory support can be intelligently adjusted based on the patient's real-time respiratory status and the preset treatment plan. For patients experiencing acute exacerbations, whose conditions may change rapidly, this intelligent adjustment function can quickly adapt to these changes, providing timely and precise respiratory support.

For example, in a patient experiencing severe respiratory distress due to an acute asthma attack, the ventilator can quickly detect even the patient's weak inspiratory effort and provide powerful inspiratory assistance instantly, helping the patient to rapidly inhale sufficient oxygen. Simultaneously, during exhalation, it reduces airway resistance, helping the patient expel waste gases smoothly, relieving breathing difficulties, and buying time and creating conditions for subsequent treatment.

For example, a patient with chronic obstructive pulmonary disease (COPD) who has severely impaired lung function may suffer from long-term respiratory muscle weakness and ventilatory dysfunction. When using this type of self-contained ventilator daily, it can continuously and stably provide personalized respiratory support based on the patient's breathing patterns and intensity, reducing the burden on the respiratory muscles and improving the patient's quality of life and exercise tolerance.

In one possible implementation, an arc-shaped plate 12 is connected to the upper part of the housing, and a combined plate 13 is fixedly connected to the lower part of the housing. The arc-shaped plate 12 and the combined plate 13 are combined to form a mounting cavity with an arc structure, and the bidirectional Venturi effect tube 4 is installed in the mounting cavity.

In this configuration, an arc-shaped plate 12 is connected to the upper part of the shell of the free-flowing ventilator, and a combined plate 13 is fixedly connected to the lower part of the shell. The arc-shaped plate 12 and the combined plate 13, when combined, form a mounting cavity with an arc-shaped structure. Taking the installation of the bidirectional Venturi effect tube 4 as an example, the bidirectional Venturi effect tube 4 is installed in this mounting cavity, enabling... The device receives stable support and protection. In the actual manufacturing process, the arc-shaped plate 12 is tightly connected to the upper part of the housing by screws or welding. Similarly, the combined plate 13 is also firmly fixed to the lower part of the housing by screw fastening, snap-fit connection, or adhesive. When the arc-shaped plate 12 and the combined plate 13 are combined, the mounting cavity they form provides a precisely matched mounting space for the bidirectional Venturi effect tube 4. During assembly, the workers carefully place the bidirectional Venturi effect tube 4 into the mounting cavity. Because the arc structure of the mounting cavity matches the shape of the bidirectional Venturi effect tube 4, the bidirectional Venturi effect tube 4 can fit tightly inside the mounting cavity, avoiding displacement or damage due to vibration or impact during use.

In an emergency scenario, a patient requires immediate ventilator support. During transport and operation, the mounting cavity formed by the arc-shaped plate 12 and the combined plate 13 stably secures the bidirectional Venturi effect tube 4, ensuring it remains in the correct position even in bumpy conditions. This guarantees normal ventilator operation and provides stable, continuous respiratory support to the patient. Similarly, in everyday hospital use, frequent use and movement can expose the ventilator to various external forces. However, thanks to this robust and precise mounting structure, the bidirectional Venturi effect tube 4 maintains optimal operating condition, reducing malfunctions and maintenance needs caused by loose or displaced components, thus improving equipment reliability and lifespan.

In one possible implementation, the memory card slot 11 is electrically connected to the processor 7 via an extended memory.

In one possible implementation, the housing 1 is also provided with a USB port 14, which is electrically connected to the processor 7 via a data input/output module, and is used for data output and charging.

In one possible implementation, the housing 1 is further provided with a digital converter interface, which is electrically connected to the processor 7 via a digital-to-analog converter.

In one possible implementation, the leftmost part of the left cavity 403 is stepped 404 to facilitate the insertion of the filter tip.

In this design, the leftmost part of the left cavity 403 is stepped 404, primarily to facilitate filter insertion. The advantages of this stepped structure include: better interface matching, as filters typically have specific shapes and sizes, and the stepped design allows for a tighter fit, ensuring accurate insertion into the left cavity; stable installation, helping to firmly secure the filter in place and preventing loosening or displacement during ventilator operation; and easier filter replacement, making filter replacement more convenient and improving efficiency.

In one possible implementation, the airflow inlet 5 includes a first airflow inlet and a second airflow inlet; the first airflow inlet corresponds to the left cavity 403; and the second airflow inlet corresponds to the right cavity 405.

In one possible implementation, the first airflow inlet is connected to a first pressure sensor; the second airflow inlet is connected to a second pressure sensor.

Figure 6 shows a schematic diagram of an implementation circuit, which also includes a weighing sensor connected to the weighing... Two differential operational amplifiers at the positive and negative OUT terminals of the sensor, and an analog-to-digital converter connected to the positive and negative SENNE terminals;

The positive terminals of the two differential operational amplifiers are connected to the positive and negative OUT terminals of the load cell, respectively, and an RG with a value of 60.4Ω is connected in series between the negative terminals of the two differential operational amplifiers.

Furthermore, an 11.3KΩ resistor R1 and a 3.3μF capacitor C1 are connected in parallel between the negative terminal and the output of a differential operational amplifier.

Another differential operational amplifier has an 11.3KΩ resistor R2 and a 3.3μF capacitor C2 connected in parallel between its negative terminal and its output terminal.

The outputs of the two differential operational amplifiers are connected in parallel with capacitors of 100pF, 1μF, and 100pF, which are connected to the positive and negative AIN terminals of the analog-to-digital converter. The capacitors of 100pF, 1μF, and 100pF are connected in series.

The positive and negative SENNE terminals of the weighing sensor are connected in parallel with capacitors of 1μF, 10μF, and 1μF, and are connected to the positive and negative PEEFIN terminals of the analog-to-digital converter. The 1μF, 10μF, and 1μF capacitors are connected in series.

Furthermore, the VDD terminal of the analog-to-digital converter is connected to capacitors with values of 0.1μF and 10μF, while the DIN terminal of the analog-to-digital converter... Terminal, SCLK terminal, The terminal connects to the SDP board and the matching circuit module.

It is also equipped with a low-dropout linear regulator, and the two IN terminals of the low-dropout linear regulator and The two OUT terminals of the low dropout linear regulator are connected in parallel with capacitors of 10μF and 0.1μF, while the two OUT terminals of the low dropout linear regulator are connected in parallel with capacitors of 0.1μF and 4.7μF, and the NR terminal of the low dropout linear regulator is connected in series with the other end of the 0.1μF capacitor.

Utilizing a weighing sensor, low-dropout linear regulator, differential operational amplifier, analog-to-digital converter, SDP board, and accompanying circuitry, this system can connect to external devices or operating systems, ensuring that user respiratory data is adequately protected during acquisition, transmission, and storage to prevent data leakage or misuse. Respiratory data can also be uploaded to the cloud for long-term monitoring, trend analysis, and sharing with healthcare professionals. Simultaneously, the security of cloud data storage is ensured.

In one possible implementation, the airflow inlet 5 includes a first airflow inlet and a second airflow inlet; the first airflow inlet corresponds to the left cavity 403; and the second airflow inlet corresponds to the right cavity 405. The first airflow inlet is connected to a first pressure sensor; and the second airflow inlet is connected to a second pressure sensor.

In this embodiment, when the subject blows air, the airflow in the left cavity 403 triggers the first pressure sensor through the first airflow inlet, and the airflow in the right cavity 405 triggers the second pressure sensor through the second airflow inlet. By using the pressure difference between the two pressure points, the subject's blowing pressure signal can be calculated, and then important respiratory parameters such as breathing depth and breathing rate can be statistically calculated.

In one possible implementation, the opening of the stepped 404 is provided with a guide slope for guiding the insertion of the filter tip into the stepped 404. The inner surface of the stepped 404 is provided with a positioning groove. The filter tip is provided with a positioning block corresponding to the positioning groove, which is used to position the filter tip in the left cavity 403.

In this embodiment, the guide ramp helps the subject more easily align and insert the filter tip into the stepped 404, reducing insertion errors and making the filter tip installation process faster and simpler. Simultaneously, the cooperation of the positioning groove and positioning block ensures that the filter tip is accurately positioned in the predetermined position of the left cavity 403 after insertion, reducing measurement errors caused by improper filter tip installation.

In one possible implementation, the surface of the grip portion 2 is provided with an anti-slip texture to improve the gripping effect. The anti-slip texture is any one or more of a wavy, dotted, or mesh pattern. An anti-slip layer is fitted onto the surface of the grip portion 2 to further improve the gripping effect. The anti-slip layer is a rubber layer or a silicone layer.

In one possible implementation, the countdown switch 15 further includes a status indicator light, which is disposed on the first side of the housing and is electrically connected to the countdown switch 15.

In this approach, anti-slip textures and anti-slip layers provide additional friction, helping subjects to grip the device more stably even with wet or sweaty hands. Soft rubber or silicone layers provide a more comfortable grip and reduce hand fatigue that may result from prolonged use. Wavy, dotted, or mesh-like anti-slip textures provide tactile feedback, helping users perceive the device's grip status.

In another application of this embodiment, the status indicator light provides visual feedback by indicating different states or modes of the device through different colors or flashing patterns of light, so that the user knows the working status of the countdown switch 15, such as power on/off, countdown in progress, etc.

In one possible implementation, a locking element is provided between the arc-shaped plate and the combined plate. The locking element is used to fix the bidirectional Venturi effect tube within the mounting cavity. The locking element is an elastic buckle or an elastic strap. Locking rings are provided at both ends of the mounting cavity for positioning the bidirectional Venturi effect tube within the mounting cavity.

In this embodiment, the locking element and locking ring ensure the bidirectional Venturi effect tube is fixed within the mounting cavity, preventing displacement or detachment during use. The elastic buckle or elastic strap and locking ring provide the necessary stability, ensuring the Venturi effect tube remains stable under various operating conditions. Furthermore, the user can quickly understand and operate the locking and unlocking process, simplifying the usage procedure.

In one possible implementation, the grip portion 2 is provided with a grip recess corresponding to a human hand gripping posture, and the grip recess is located in the middle of the grip portion 2. The free ventilator also includes counterweights, a plurality of which are detachably installed in the bottom of the grip portion 2 for adjusting the center of gravity of the free ventilator in the gripping state.

In this design, the recessed grip section conforms to the human hand's grip posture, providing a more comfortable holding experience and reducing hand fatigue during prolonged use. The recessed grip design helps users hold the device more stably and reduces... Sliding or displacement during use.

In another scenario of this embodiment, the counterweight can adjust the center of gravity of the device when held, making the device more balanced and easier to operate. Different users may have different preferences for the weight and center of gravity of the device. The counterweight provides flexibility to adapt to the needs of different users. Users can adjust the weight and center of gravity of the device by adding or removing counterweights according to their personal preferences and needs.

The main advantages of this invention are that, in addition to possessing all the advantages of similar products such as portability, on-the-go monitoring, and digital management, it also includes: Simple operation: By analyzing respiratory parameters under calm conditions, it is convenient for daily use without special training, suitable for various groups of people. It particularly solves the technical problem of difficulty in performing lung function tests for people with poor lung function and young children. For example: 1. For COPD patients, those with poor lung function or those experiencing acute exacerbations, they cannot perform forced breathing, thus failing to meet the needs of detection and assessment of their condition. This product can collect data under calm breathing conditions (respiratory rate, respiratory depth, and inspiratory/expiratory time ratio, etc.) and respiratory waveforms (normal population: respiratory cycle approximately 2-3 seconds, symmetrical inspiratory and expiratory waveforms, balanced inspiratory/expiratory time ratio, peak expiratory flow rate appearing in the middle stage VS COPD respiratory cycle approximately 4-5 seconds, asymmetrical respiratory waveforms, prolonged expiratory time, peak expiratory flow rate appearing earlier) for analysis. By analyzing changes in daily monitoring data and graphical appearance, it can determine whether there are changes in the patient's condition, thus achieving the monitoring purpose of timely medical attention and preventing accidents. 2. Young children often have poor compliance and cannot clearly understand medical staff's instructions. Therefore, respiratory monitoring in young children has always been a major challenge in clinical work. This product is simple and easy to use; children can complete the operation while watching cartoons or reading books.

It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure.

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

Claims (20)

A free breathing machine is characterized by comprising a housing (1), wherein a gripping part (2) is arranged at the bottom end of the housing (1), a power switch (3) and a memory card slot (11) are respectively arranged on the upper end face of the housing (1), a charging port is arranged on the lower end face of the housing (1), a bidirectional Venturi effect tube (4) is embedded on one side of the housing (1), an airflow inlet (5) is arranged on the side of the housing (1) where the bidirectional Venturi effect tube (4) is located, a display (6) is also arranged on the housing (1), and a countdown switch (15) is arranged on the first side of the housing (1). An operating system is arranged inside the housing (1). The operating system includes a processor (7), a differential operational amplifier (8), a differential pressure sensor (9), and a power supply (10). The power supply (10) is electrically connected to the processor (7). The input terminal of the differential operational amplifier (8) is connected to the output terminal of the differential pressure sensor (9). The input terminal of the processor (7) is connected to the output terminal of the differential operational amplifier (8). The input terminal of the display (6) is connected to the output terminal of the processor (7). The memory card slot (11) is used to store the output data in the memory card. The differential pressure sensor (9) includes a first pressure sensor and a second pressure sensor. Both the first pressure sensor and the second pressure sensor are connected to the airflow output port on the bidirectional Venturi effect tube (4) through the airflow input port (5). According to claim 1, the free ventilator is characterized in that an arc plate (12) is connected to the upper part of the shell and a combination plate (13) is fixedly connected to the lower part of the shell. The arc plate (12) and the combination plate (13) are combined to form an installation cavity with an arc structure, and a bidirectional Venturi effect tube (4) is installed in the installation cavity. The free-breathing machine according to claim 1 is characterized in that the memory card slot (11) is electrically connected to the processor (7) via an extended memory. According to claim 1, the free breathing machine is characterized in that the housing (1) is further provided with a USB port (14), the USB port (14) is electrically connected to the processor (7) through a data input/output module, and the USB port (14) is used for data output and charging. According to claim 1, the free ventilator is characterized in that the housing (1) is further provided with a digital converter interface, which is electrically connected to the processor (7) through a digital-to-analog converter. According to claim 1, the free-ventilator is characterized in that the bidirectional Venturi effect tube (4) includes a cylinder (401) with two openings, and a narrow section (402) is provided at the midline of the cylinder (401), the narrow section (402) dividing the cylinder (401) into two interconnected left cavities (403) and right cavities. (405) The upper part of the left cavity (403) is connected to a proximal vent (406), and the upper part of the right cavity (405) is connected to a distal vent (407). The free-flow ventilator according to claim 6 is characterized in that the leftmost part of the left cavity (403) is stepped (404) to facilitate the insertion of the filter. According to claim 6, the free ventilator is characterized in that the airflow inlet (5) includes a first airflow inlet and a second airflow inlet; the first airflow inlet corresponds to the left cavity (403); and the second airflow inlet corresponds to the right cavity (405). The free-flow ventilator according to claim 8 is characterized in that the first airflow inlet is connected to the first pressure sensor; and the second airflow inlet is connected to the second pressure sensor. According to claim 7, the free breathing machine is characterized in that a guide slope is provided at the opening of the stepped (404) to guide the insertion of the filter tip into the interior of the stepped (404). According to claim 7, the free breathing machine is characterized in that a positioning groove is provided on the inner side of the stepped (404), and the filter is provided with a positioning block corresponding to the positioning groove, for positioning and installing the filter in the left cavity (403). According to claim 1, the free breathing machine is characterized in that the surface of the grip part (2) is provided with anti-slip texture to improve the gripping effect. The free breathing machine according to claim 12 is characterized in that the anti-slip texture is any one or more of a wavy, dotted, or mesh pattern. According to claim 1, the free breathing machine is characterized in that the surface of the gripping part (2) is provided with an anti-slip layer to improve the gripping effect. The free breathing machine according to claim 13 is characterized in that the anti-slip layer is a rubber layer or a silicone layer. According to claim 1, the free breathing machine is characterized in that the countdown switch (15) further includes a status indicator light, which is electrically connected to the countdown switch (15). According to claim 2, the free breathing machine is characterized in that a locking member is provided between the arc plate (12) and the combined plate (13), the locking member is used to fix the bidirectional Venturi effect tube (4) in the mounting cavity, and the locking member is an elastic buckle or an elastic strap. According to claim 2, the free ventilator is characterized in that locking rings are provided at both ends of the mounting cavity for positioning the bidirectional Venturi effect tube (4) in the mounting cavity. According to claim 1, the free breathing machine is characterized in that the grip part (2) is provided with a grip recess section corresponding to the gripping posture of a human hand, and the grip recess section is located in the middle position of the grip part (2). The free ventilator according to claim 1 is characterized in that it further includes counterweights, and a plurality of the counterweights are detachably installed in the bottom of the grip (2) for adjusting the center of gravity position of the free ventilator in the grip state.