Spontaneous breathing machine

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 breathing machine TECHNICAL FIELD

[0001] The present application relates to the technical field of respiratory monitoring, and particularly relates to a free breathing machine. BACKGROUND

[0002] Investigations show that the incidence of COPD among people aged 40 and above in China reached 13.7% in 2018, and more alarmingly, the number of young people diagnosed with COPD is increasing. The total number of COPD patients in China is about 100 million. In 2013, the total number of deaths from COPD was about 910,000, ranking third among individual diseases, accounting for 31.1% of the global number of COPD-related deaths. With the advent of the post-pandemic era, many people are plagued by long-COVID symptoms or anxiety; some sports stars hope to improve their endurance through professional and scientific guidance; and healthy people monitor their respiratory health to achieve early treatment of diseases. Therefore, there is an urgent need for a simple and portable respiratory detection product with high cost performance to meet the needs of different groups of people for health and improved quality of life.

[0003] A portable respiratory monitor is a device used to monitor an individual's respiratory function, typically used in medical, health, and sports fields. Portable respiratory monitors usually use sensor technology principles and apply various sensors to detect and record respiratory activity. These sensors can include differential pressure sensors, flow sensors, temperature sensors, and optical sensors, etc. to measure parameters such as respiratory airflow, chest and abdominal movement, etc.

[0004] Most of the existing respiratory detectors on the market use flow measurement technology as the design principle. However, for COPD patients, people with poor lung function or acute onset, it is difficult to complete the forced breathing operation, thus failing to meet the needs of detection and assessment of the disease. In view of this, we propose a free breathing machine.

[0005] SUMMARY

[0006] The purpose of the present application is to overcome the shortcomings of the prior art, adapt to the needs of reality, and provide a free breathing machine to solve the technical problem that people with poor lung function or acute onset cannot complete the forced breathing operation, thus failing to meet the needs of detection and assessment of the disease.

[0007] In order to achieve the purpose of the present application, the technical scheme adopted by the present application is as follows: a free breathing machine is designed, which comprises a shell, a holding part is arranged at the bottom end of the shell, an equipment power switch and a memory card slot are respectively arranged on the upper end face of the shell, a charging port is arranged on the lower end face of the shell, a two-way Venturi effect pipe is inlaid on the side vertical face of the shell, a gas flow input port is arranged on the side of the shell where the two-way Venturi effect pipe is arranged, a display is further arranged on the shell, a countdown switch is arranged on the first side of the shell, and the memory card slot is used for storing output data in a memory card.

[0008] An operating system is arranged in the shell, the operating system comprises a processor, a difference operation amplifier, a differential pressure sensor and a power supply; the power supply is electrically connected with the processor, the input end of the difference operation amplifier is connected with the output end of the differential pressure sensor, the input end of the processor is connected with the output end of the difference operation amplifier, and the input end of the display is connected with the output end of the processor.

[0009] The differential pressure sensor comprises a first pressure sensor and a second pressure sensor, and the first pressure sensor and the second pressure sensor are in communication with the gas flow output port on the two-way Venturi effect pipe through the gas flow input port.

[0010] In a possible implementation, an arc-shaped plate is connected to the upper part of the shell, and a combination plate is fixedly connected to the lower part of the shell; the arc-shaped plate and the combination plate are combined to form a mounting cavity with a circular arc structure, and the two-way Venturi effect pipe is mounted in the mounting cavity.

[0011] In a possible implementation, the memory card slot is electrically connected with the processor through an expansion memory.

[0012] In a possible implementation, the shell is further provided with a USB port, the USB port is electrically connected with the processor through a data input and output module, and the USB port is used for data output and charging.

[0013] In a possible implementation, the shell is further provided with a digital converter interface, and the digital converter interface is electrically connected with the processor through a digital-to-analog converter.

[0014] In a possible implementation, the two-way Venturi effect pipe comprises a cylinder body with two openings, a narrow section is arranged at the middle line position of the cylinder body, the narrow section divides the cylinder body into a left cavity and a right cavity which are in communication with each other, a proximal end air hole is in communication with the upper part of the left cavity, and a distal end air hole is in communication with the upper part of the right cavity.

[0015] In a possible implementation, the leftmost part of the left cavity is in a stepped shape to facilitate the insertion of a filter tip.

[0016] In a possible implementation, the air flow input port includes a first air flow input port and a second air flow input port; the first air flow input port corresponds to the left cavity; and the second air flow input port corresponds to the right cavity.

[0017] In a possible implementation, the first air flow input port is connected to a first pressure sensor; and the second air flow input port is connected to a second pressure sensor.

[0018] In a possible implementation, the stepped opening is provided with a guide slope for guiding insertion of the filter rod into the stepped interior.

[0019] In a possible implementation, the stepped inner side is provided with a positioning groove, and the filter rod is provided with a positioning block corresponding to the positioning groove, for positioning and mounting the filter rod in the left cavity.

[0020] In a possible implementation, the surface of the holding portion is provided with anti-slip textures for improving the gripping effect.

[0021] In a possible implementation, the anti-slip textures are in any one or more of a wave shape, a dot shape, or a mesh shape.

[0022] In a possible implementation, the surface of the holding portion is provided with an anti-slip layer for improving the gripping effect.

[0023] In a possible implementation, the anti-slip layer is a rubber layer or a silica gel layer.

[0024] In a possible implementation, the countdown switch further includes a state prompt lamp, which is arranged on the first side of the shell and electrically connected to the countdown switch.

[0025] In a possible implementation, a locking member is arranged between the arc-shaped plate and the combination plate, and is used to fix the bidirectional Venturi effect tube in the mounting cavity; the locking member is an elastic lock or an elastic band.

[0026] In a possible implementation, the mounting cavity is provided with locking rings at both ends, for positioning the bidirectional Venturi effect tube in the mounting cavity.

[0027] In a possible implementation, the holding portion is provided with a holding recess segment corresponding to a human hand holding posture, which is located at a middle position of the holding portion.

[0028] In a possible implementation, the free breathing machine further comprises counterweights, a plurality of the counterweights being detachably installed in the bottom of the holding part, for adjusting the center of gravity of the free breathing machine in the holding state.

[0029] Compared with the prior art, the present application realizes the breath monitoring by arranging a plurality of differential pressure sensors, which can measure the speed and quantity of gas passing through the device during the breathing process, including two or more sensors respectively connected to the proximal air hole and the distal air hole of the bidirectional Venturi effect tube. When the gas flow passes through the bidirectional Venturi effect tube, a differential pressure is generated, which can be measured by the sensor, so as to calculate the speed and quantity of the gas flow. Then, the differential pressure sensor converts these data into digital signals, which are input into the processor through the differential value operational amplifier for processing and recording. The present application has the advantages of accurate breath data acquisition function and portability, which can not only accurately and real-timely monitor important breath parameters such as the breath rate, breath depth and breath frequency, but also can be carried by the user at any time and any place for lung function test. BRIEF DESCRIPTION OF DRAWINGS

[0030] Fig. 1 is a schematic diagram of the overall structure of the present application;

[0031] Fig. 2 is a schematic diagram of the shell structure of the present application;

[0032] Fig. 3 is a schematic diagram of the shell structure of the present application;

[0033] Fig. 4 is a schematic diagram of the structure section of the bidirectional Venturi effect tube in the present application;

[0034] Fig. 5 is a detection electrical schematic diagram of the differential pressure sensor in the present application;

[0035] Fig. 6 is an electrical schematic diagram of one embodiment of the present application;

[0036] In the figure: 1, shell; 2, holding part; 3, device power switch; 4, bidirectional Venturi effect tube; 5, gas input port; 6, display; 7, processor; 8, differential value operational amplifier; 9, differential pressure sensor; 10, power supply; 11, memory card slot; 12, arc-shaped plate; 13, combination plate; 14, USB port; 15, countdown switch;

[0037] 401, cylinder; 402, narrow section; 403, left cavity; 404, ladder shape; 405, right cavity; 406, proximal air hole; 407, distal air hole. DETAILED DESCRIPTION

[0038] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0039] In the description of the specification and claims of the present application and the above drawings, the description of “first”, “second” and the like is only for the purpose of description, for distinguishing different objects, and is not used to describe a specific sequence, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implying a specific indication of the number of the indicated technical features.

[0040] For “and / or” or “and / or” appearing in the text, its meaning includes three parallel solutions. Taking “A and / or B” as an example, it includes A solution, or B solution, or A and B solutions.

[0041] The phrase “embodiment” mentioned in the text means that the specific features, structures or characteristics described in combination with the embodiment can be included in at least one embodiment of the present application. The phrase appears at various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment to other embodiments. A person skilled in the art explicitly and implicitly understands that the embodiments described herein can be combined with other embodiments.

[0042] The technical solutions provided by the embodiments of the present application can overcome the problem that the existing breathing machine cannot complete forced breathing operation for COPD patients, people with poor lung function or people with acute attack, so as to meet the needs of detection and evaluation of disease.

[0043] Referring to FIGS. 1 to 6.

[0044] It can be understood that the free breathing machine is a device which can replace, control or change the normal physiological breathing of a person, increase the lung ventilation, improve the respiratory function, reduce the respiratory work consumption and save the heart reserve capacity. When the autonomous ventilation, the chest cavity negative pressure is generated by the inhale action, the lung is passively expanded to generate the alveolar and airway negative pressure, thereby forming the pressure difference between the airway opening and the alveolar to complete the inhale. Therefore, the normal breathing is to complete the inhale by the alveolar and airway "active negative pressure difference" generated by the body through the breathing action, and the chest and lung elastic recoil after the inhale generates the alveolar and airway "passive positive pressure difference" to exhale, so as to meet the physiological ventilation needs. And the breathing machine ventilation is to generate the positive pressure difference between the airway opening and the alveolar by the external mechanical driving, and the chest and lung elastic recoil after the external mechanical driving pressure is removed generates the alveolar and airway "passive positive pressure difference" to exhale, that is, the breathing cycle exists "passive positive pressure difference" to complete the breathing.

[0045] Based on this, an embodiment of the present application provides a free breathing machine, which comprises a shell 1, a holding part 2 is arranged at the bottom end of the shell 1, a device power switch 3 and a memory card slot 11 are arranged on the upper end face of the shell 1 respectively, a charging port is arranged on the lower end face of the shell 1, a two-way Venturi effect pipe 4 is inlaid on the side vertical surface of the shell 1, a gas flow input port 5 is arranged on one side of the shell 1 which is provided with the two-way Venturi effect pipe 4, a display 6 is further arranged on the shell 1, and a countdown switch 15 is arranged on the first side of the shell 1; an operating system is arranged in the shell 1, the operating system comprises a processor 7, a difference operation amplifier 8, a pressure difference sensor 9 and a power supply 10; the power supply 10 is electrically connected with the processor 7, the input end of the difference operation amplifier 8 is connected with the output end of the pressure difference sensor 9, the input end of the processor 7 is connected with the output end of the difference operation amplifier 8, the input end of the display 6 is connected with the output end of the processor 7, and the memory card slot 11 is used for storing the output data in a memory card; the pressure difference sensor 9 comprises a first pressure sensor and a second pressure sensor, and the first pressure sensor and the second pressure sensor are both communicated with a gas flow output port on the two-way Venturi effect pipe 4 through the gas flow input port 5.

[0046] As shown in Fig. 3, in one possible embodiment, the bidirectional Venturi tube 4 comprises a cylinder 401 with two openings, and a narrow section 402 is arranged at the center line of the cylinder 401, which separates the cylinder 401 into two cavities 403 and 405 that are in communication with each other. The upper part of the left cavity 403 is connected with a proximal air hole 406, and the upper part of the right cavity 405 is connected with a distal air hole 407. In this way, the bidirectional Venturi tube 4 can help to adjust the flow rate and pressure of the gas. The proximal air hole 406 is connected to a gas source, and the distal air hole 407 is connected to the breathing interface of the patient. Through the action of the narrow section 402, appropriate airflow assistance is provided when the patient inhales, and certain adjustment is also achieved when the patient exhales, so as to improve the breathing condition of the patient.

[0047] The existing portable respiratory monitor is a device for monitoring the respiratory function of an individual, which is usually used in the fields of medical treatment, health and sports. The portable respiratory monitor usually uses sensor technology principles and applies various sensors to detect and record respiratory activities. These sensors can include differential pressure sensors, flow sensors, temperature sensors and optical sensors, etc., which are used to measure parameters such as respiratory airflow, chest and abdominal movement, etc. The present embodiment is different from the conventional lung function monitor, which abandons the condition of forced breathing in the conventional operation, and can be used to measure the amount of air that the subject can inhale and exhale in a calm state, and the airflow rate is measured in liters per second. In this technical application, the method of measuring flow rate is based on one of the laws of fluid dynamics, i.e. the Venturi effect. According to the Venturi effect, when a fluid flows through a pipe from a wider part to a narrower part, the pressure of the fluid will decrease, and the flow rate will increase. In order to satisfy the law of conservation of mass, the flow rate and pressure of the fluid will change, which is described by the following equation, which is usually referred to as the "Venturi effect equation".

[0048] where P1 and P2 are the pressures on both sides of the throat, d is the density of the fluid, and v1 and v2 are the velocities on both sides of the throat. The present application is realized by a differential pressure sensor, which can measure the speed and amount of gas passing through the device during the breathing process. Two or more sensors are included, which are respectively installed at the inlet and outlet of the bidirectional Venturi tube 4. In the present embodiment, the sensors are arranged in two, when the airflow flows from the left cavity 403 to the right cavity 405, i.e. the subject blows, the differential pressure sensor connected to the proximal air hole senses the blowing pressure signal, and when the airflow flows from the right to the left, i.e. the subject inhales, the differential pressure sensor connected to the distal air hole senses the inhaling pressure signal. Then, the differential pressure sensor converts these data into digital signals, which are input into the processor 7 through the differential value operational amplifier 8 for processing and recording.

[0049] 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, and finally displayed on the display 6. The relevant data can be stored in the memory card through the memory card slot 11 for subsequent analysis and review. For example, the user can conveniently operate the ventilator by holding the handle 2, and through the coordinated work of the airflow input port 5 and the bidirectional Venturi effect tube 4, stable airflow supply is achieved.

[0050] Specifically, when the user turns on the device power switch 3, the power supply 10 starts to supply power to the processor 7 and other components, so that the entire system starts to run. During the operation of the ventilator, the bidirectional Venturi effect tube 4 inhales external air through the airflow input port 5, and the first and second pressure sensors monitor the pressure of the airflow 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 results to the processor 7. The processor 7 analyzes and calculates the received data to obtain the current airflow pressure, flow rate, and other parameters, and transmits these parameters to the display 6 for display, so that the user or medical personnel can understand the working state of the device in real time. At the same time, the memory card slot 11 can store the relevant data output by the processor 7 in the inserted memory card, which is convenient for subsequent analysis and review of the data during use, and provides a basis for adjusting and optimizing the treatment plan.

[0051] For example, in the intensive care unit of a hospital, a patient with severe respiratory failure needs to use a ventilator for assisted breathing. The medical staff charges the free ventilator through the charging port, turns on the device power switch 3, and connects the breathing mask to the airflow output port. By adjusting the countdown switch 15, the use time and ventilation mode of the ventilator are set. During use, the display 6 displays the patient's respiratory rate, tidal volume, airway pressure, and other parameters in real time, and the medical staff adjusts the parameters of the ventilator according to these parameters to ensure that the patient receives the best respiratory support. After use, the data in the memory card is exported for analysis of the patient's respiratory condition changes and evaluation of the treatment effect. In the home care scenario, a chronic obstructive pulmonary disease (COPD) patient needs to use a ventilator for rehabilitation treatment at home for a long time. When the patient or his family uses the free ventilator, they first charge the ventilator through the charging port, then turn on the power switch 3, and select the appropriate breathing mode and parameters for the patient. During use, the patient can check his respiratory condition at any time through the display 6. The family members can regularly take the data in the memory card to the hospital for the doctor to evaluate the patient's condition and treatment effect, so as to adjust the treatment plan in a timely manner.

[0052] In one possible implementation, for people with poor lung function or acute attack, due to insufficient strength of their own respiratory muscles, reduced lung compliance, etc., they often cannot complete the forced breathing operation. To solve this problem, the bidirectional Venturi tube 4 of the free breathing machine of the present embodiment can actively guide and regulate the air flow in and out. During the patient's inhalation phase, the bidirectional Venturi tube 4 generates negative pressure, actively inhales air through the air flow input port 5, and helps the patient overcome the difficulty of inhalation caused by the weakness of the respiratory muscles. Even if the patient's own inhalation strength is very weak, the breathing machine can quickly generate enough negative pressure to introduce air into the lungs, ensuring sufficient oxygen supply. The first pressure sensor and the second pressure sensor in the differential pressure sensor 9 can accurately monitor the airway pressure changes in real time during the breathing process. When it is monitored that the patient's inhalation effort is insufficient, the processor 7 will adjust the working parameters of the bidirectional Venturi tube 4 in time according to the data feedback by the differential pressure sensor 9, increase the inhalation assistance strength, and ensure that the air enters the lungs smoothly.

[0053] During the exhalation phase, the bidirectional Venturi tube 4 can appropriately reduce the pressure in the airway to help the patient more easily expel carbon dioxide from the lungs. For patients with poor lung function, the elastic recoil ability of the lungs is weakened, and spontaneous exhalation may not be sufficient, leading to carbon dioxide retention. The active exhalation assistance function of the breathing machine can effectively avoid this situation and maintain the balance of gas exchange in the patient's body.

[0054] In addition, through the cooperative work of the processor 7 and the differential operation amplifier 8 in the operating system, the intensity and frequency of the breathing support can be intelligently adjusted according to the real-time breathing condition of the patient and the preset treatment scheme. For patients with acute attack, the condition may change in a short time, and this intelligent adjustment function can quickly adapt to the condition change to provide timely and accurate breathing support for the patient.

[0055] For example, for a patient with acute asthma attack leading to severe respiratory distress, when using the free breathing machine, the breathing machine can quickly perceive the patient's weak inhalation effort and provide strong inhalation assistance in an instant to help the patient quickly inhale sufficient oxygen. At the same time, during exhalation, the airway resistance is reduced to assist the patient to smoothly expel waste gas and relieve the symptoms of breathing difficulty, creating conditions for subsequent treatment.

[0056] For example, a patient with chronic obstructive pulmonary disease (COPD) leading to severe impairment of lung function has long-term respiratory muscle weakness and ventilation dysfunction. When using the free breathing machine in daily life, the breathing machine can provide personalized breathing support continuously and stably according to the changes in the patient's breathing pattern and strength, reduce the burden on the patient's respiratory muscles, and improve the patient's quality of life and activity tolerance.

[0057] In a possible implementation, the upper part of the shell is connected with an arc-shaped plate 12, and the lower part of the shell is fixedly connected with a combination plate 13. The arc-shaped plate 12 and the combination plate 13 are combined to form an installation cavity with a circular arc structure. The bidirectional Venturi effect tube 4 is installed in the installation cavity.

[0058] In this way, the upper part of the shell of the free breathing machine is connected with an arc-shaped plate 12, and the lower part of the shell is fixedly connected with a combination plate 13. The arc-shaped plate 12 and the combination plate 13 are combined to form an installation cavity with a circular arc structure. Taking the installation of the bidirectional Venturi effect tube 4 as an example, the bidirectional Venturi effect tube 4 is installed in the installation cavity, which can obtain stable support and protection. In actual production and manufacturing process, the arc-shaped plate 12 is tightly connected to the upper part of the shell by means of screws or welding. Similarly, the combination plate 13 is fixed to the lower part of the shell by means of firm connection, such as screw fastening, buckle connection or adhesion. When the arc-shaped plate 12 and the combination plate 13 are combined together, the installation cavity formed by them provides an accurately matched installation space for the bidirectional Venturi effect tube 4. During assembly, the worker carefully places the bidirectional Venturi effect tube 4 in the installation cavity. Because the circular arc structure of the installation cavity matches the shape of the bidirectional Venturi effect tube 4, the bidirectional Venturi effect tube 4 can be tightly fitted inside the installation cavity, avoiding displacement or damage due to vibration or collision during use.

[0059] Suppose in an emergency scene, the patient needs to use the breathing machine for emergency breathing support. During transportation and operation, due to the stable fixation of the installation cavity formed by the arc-shaped plate 12 and the combination plate 13 to the bidirectional Venturi effect tube 4, even in a bumpy environment, the bidirectional Venturi effect tube 4 can always remain in the correct position, ensuring the normal work of the breathing machine and providing stable and continuous breathing support for the patient. For example, in the daily hospital use scene, due to frequent use and movement, the breathing machine may be affected by various external forces. But thanks to this firm and accurate installation structure, the bidirectional Venturi effect tube 4 can always maintain good working condition, reducing the failure and maintenance demand caused by loose or displacement of equipment parts, and improving the reliability and service life of the equipment.

[0060] In a possible implementation, the memory card slot 11 is electrically connected to the processor 7 through an expansion memory.

[0061] In a possible implementation, the shell 1 is also provided with a USB port 14, which is electrically connected to the processor 7 through a data input and output module, and is used for data output and charging.

[0062] In a possible implementation, the shell 1 is further provided with a digital converter interface, which is electrically connected to the processor 7 through a digital-to-analog converter.

[0063] In a possible implementation, the leftmost side of the left cavity 403 is designed to be stepped 404 for facilitating insertion of the filter.

[0064] In this way, the leftmost side of the left cavity 403 is designed to be stepped 404, mainly for facilitating insertion of the filter. The stepped structure has the advantages of better interface matching, stable installation, and convenient replacement of the filter.

[0065] In a possible implementation, the airflow input port 5 includes a first airflow input port and a second airflow input port; the first airflow input port corresponds to the left cavity 403; and the second airflow input port corresponds to the right cavity 405.

[0066] In a possible implementation, the first airflow input port is connected to a first pressure sensor; and the second airflow input port is connected to a second pressure sensor.

[0067] As shown in the circuit schematic diagram in FIG. 6, a weighing sensor is further provided, two difference operational amplifiers are respectively connected to the positive and negative OUT terminals of the weighing sensor, and an analog-to-digital converter is connected to the positive and negative SENNE terminals;

[0068] The positive terminals of the two difference operational amplifiers are respectively connected to the positive and negative OUT terminals of the weighing sensor, and a resistor RG with a value of 60.4Ω is connected in series between the negative terminals of the two difference operational amplifiers.

[0069] A resistor R1 with a value of 11.3KΩ and a capacitor C1 with a value of 3.3μF are connected in parallel between the negative terminal of one of the difference operational amplifiers and the output terminal.

[0070] A resistor R2 with a value of 11.3KΩ and a capacitor C2 with a value of 3.3μF are connected in parallel between the negative terminal of the other difference operational amplifier and the output terminal.

[0071] The output terminals of the two difference operational amplifiers are connected in parallel to capacitors with values of 100pF, 1μF, and 100pF, and are connected to the positive and negative AIN terminals of the analog-to-digital converter; and the capacitors with values of 100pF, 1μF, and 100pF are connected in series.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] In one possible implementation, the opening of the stepped shape 404 is provided with a guide slope to guide the insertion of the filter tip into the stepped shape 404. The inner surface of the stepped shape 404 is provided with a positioning groove, and the filter tip is provided with a positioning block corresponding to the positioning groove for positioning and mounting the filter tip in the left cavity 403.

[0079] In this embodiment, the guide slope helps the subject to more easily align and insert the filter tip into the stepped 404 interior, reducing errors during insertion, making the installation process of the filter tip more rapid and simple. At the same time, the use of the positioning groove and the positioning block ensures that the filter tip can be accurately positioned at the predetermined position of the left cavity 403 after insertion, reducing measurement errors caused by improper installation of the filter tip.

[0080] In a possible implementation, the surface of the holding part 2 is provided with anti-slip texture for improving the gripping effect. The anti-slip texture is any one or more of a wavy, dotted or net-like pattern. The surface of the holding part 2 is provided with an anti-slip layer for improving the gripping effect. The anti-slip layer is a rubber layer or a silicone layer.

[0081] In a possible implementation, the countdown switch 15 further comprises a state prompt light, which is arranged on the first side of the shell and electrically connected with the countdown switch 15.

[0082] In this mode, the anti-slip texture and the anti-slip layer provide additional friction, which can help the subject to more stably grip the device even in the case of wet hands or sweating, and the soft rubber layer or silicone layer can provide a more comfortable grip, reducing hand fatigue that may be caused by long-term use, and the wavy, dotted or net-like pattern of the anti-slip texture can provide tactile feedback to help the user perceive the grip state of the device.

[0083] In another application of this embodiment, the state prompt light provides visual feedback, indicating different states or modes of the device through different colors or flashing patterns of the light, so that the user knows the working state of the countdown switch 15, such as turning on or off, or the countdown is in progress.

[0084] In a possible implementation, a locking member is arranged between the arc-shaped plate and the combination plate, which is used to fix the bidirectional Venturi effect tube in the mounting cavity, and the locking member is an elastic lock or an elastic band. The two ends of the mounting cavity are provided with locking rings for positioning the bidirectional Venturi effect tube in the mounting cavity.

[0085] In this embodiment, the locking member and the locking ring ensure the fixation of the bidirectional Venturi effect tube in the mounting cavity, preventing displacement or falling during use. The elastic lock or the elastic band and the locking ring provide the necessary stability to ensure that the Venturi effect tube can remain stable under various use conditions, and the user can quickly understand and operate the locking and unlocking process, simplifying the use process.

[0086] In a possible implementation, the holding part 2 is provided with a holding recess section corresponding to the holding posture of a human hand, and the holding recess section is located at the middle position of the holding part 2. The free breathing machine further comprises counterweights, and a plurality of the counterweights are detachably installed in the bottom of the holding part 2, and used to adjust the gravity center position of the free breathing machine in the holding state.

[0087] In this way, the holding recess section conforms to the holding posture of a human hand, and a more comfortable holding experience can be provided, and hand fatigue during long-time use is reduced. The holding recess section design helps the user to hold the device more stably, and reduces sliding or displacement during use.

[0088] In another scenario of the embodiment, the counterweights can adjust the gravity center position of the device in the holding state, so that the device is more balanced and easy to operate. Different users may have different preferences for the weight and gravity center position of the device, and the counterweights provide flexibility to adapt to the needs of different users. Users can adjust the weight and gravity center of the device by increasing or decreasing the counterweights according to personal preferences and needs.

[0089] The main advantage of the present application is that, in addition to all the advantages of portability, instant detection and digital management of similar products, it also has the following advantages: simple operation: data analysis is performed by detecting respiratory parameters in a calm state, which is convenient for use in daily life and does not require special training, and is suitable for use by various groups of people, especially solving the technical problem that people with poor lung function and young people cannot easily complete lung function detection, for example: 1. For COPD patients, people with poor lung function or acute onset, cannot complete forced breathing operation, and thus cannot meet the needs of detection and assessment of disease conditions. This product can collect data (respiratory rate, respiratory depth, and inspiration / exhalation time ratio) and respiratory waveform graphs (normal people: respiratory cycle about 2-3 seconds, symmetric respiratory inhalation and exhalation waveform, balanced inspiration and expiration time, exhalation peak flow rate appears in the middle VS COPD respiratory cycle about 4-5 seconds, asymmetric respiratory waveform, prolonged exhalation time, exhalation peak flow rate appears early) in a calm breathing state for analysis, and through changes in daily detection data and graphical appearance, it is determined whether the patient has a change in disease condition, so as to achieve the monitoring purpose of timely medical treatment and avoiding accidents. 2. For young people, compliance is poor, and they cannot clearly understand the instructions of medical personnel, therefore, respiratory monitoring of young people has always been a big problem in clinical work. This product is simple and easy to use, and the test children can complete the operation during watching cartoons or reading books.

[0090] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, but not limiting the present disclosure.

[0091] The embodiments of the present application disclose the preferred embodiments, but are not limited to the same. Those skilled in the art can easily understand the spirit of the present application according to the above embodiments, and make different inferences and changes, as long as they do not deviate from the spirit of the present application, and are within the protection scope of the present application.

Claims

1. A free breathing machine, characterized in that, The utility model provides a kind of portable air pressure difference measuring device, including shell (1), the shell (1) bottom end is arranged with grip (2), the shell (1) upper end surface is respectively arranged with equipment power switch (3) and memory card slot (11), the shell (1) lower end surface is arranged with charging port, the shell (1) one side vertical surface is inlaid with two-way venturi effect pipe (4), the shell (1) is arranged with airflow input port (5) in the one side of the two-way venturi effect pipe (4), the shell (1) is also arranged with display (6), the first side of shell (1) is arranged with countdown switch (15); The shell (1) is internally arranged with an operating system, which 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 end of the differential operational amplifier (8) is connected to the output end of the differential pressure sensor (9). The input end of the processor (7) is connected to the output end of the differential operational amplifier (8). The input end of the display (6) is connected to the output end of the processor (7). The memory card slot (11) is used to store output data in a 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 in communication with the airflow output port on the two-way venturi effect pipe (4) through the airflow input port (5).

2. The free breathing machine of claim 1, wherein, An arc-shaped plate (12) is connected to the top of the shell, and a combination plate (13) is fixedly connected to the bottom of the shell. The combination of the arc-shaped plate (12) and the combination plate (13) forms a mounting cavity with a circular arc structure, and the two-way venturi effect pipe (4) is installed in the mounting cavity.

3. The free breathing machine of claim 1, wherein, The memory card slot (11) is electrically connected to the processor (7) through an expansion memory.

4. The free breathing machine of claim 1, wherein, The shell (1) is also provided with a USB port (14), which is electrically connected to the processor (7) through a data input / output module. The USB port (14) is used for data output and charging.

5. The free breathing machine of claim 1, wherein, The shell (1) is also provided with a digital converter interface, which is electrically connected to the processor (7) through a digital-to-analog converter.

6. The free breathing machine of claim 1, wherein, The two-way venturi effect pipe (4) includes a cylinder (401) with two openings. A narrow section (402) is arranged at the center line of the cylinder (401), which divides the cylinder (401) into a left cavity (403) and a right cavity (405) that are in communication with each other. A proximal air hole (406) is connected to the top of the left cavity (403). A distal air hole (407) is connected to the top of the right cavity (405).

7. The free breathing machine of claim 6, wherein, The leftmost side of the left cavity (403) is in a stepped shape (404) to facilitate the insertion of a filter tip.

8. The free breathing machine of claim 6, wherein, The airflow input port (5) includes a first airflow input port and a second airflow input port. The first airflow input port corresponds to the left cavity (403), and the second airflow input port corresponds to the right cavity (405).

9. The free breathing machine of claim 8, wherein, The first airflow input port is connected to the first pressure sensor, and the second airflow input port is connected to the second pressure sensor.

10. The free breathing machine of claim 7, wherein, The stepped (404) opening is provided with a guide slope for guiding the insertion of the filter into the stepped (404) interior.

11. The free breathing machine of claim 7, wherein, The stepped (404) inner side is provided with a positioning groove, 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).

12. The free breathing machine of claim 1, wherein, The surface of the holding part (2) is provided with anti-skid texture for improving the gripping effect.

13. The free breathing machine of claim 12, wherein, The anti-skid texture is any one or more of wave-shaped, dotted or net-shaped patterns.

14. The free breathing machine of claim 1, wherein, The surface of the holding part (2) is provided with an anti-skid layer for improving the gripping effect.

15. The free breathing machine of claim 13, wherein, The anti-skid layer is a rubber layer or a silica gel layer.

16. The free breathing machine of claim 1, wherein, The countdown switch (15) further comprises a state prompt lamp electrically connected with the countdown switch (15).

17. The free breathing machine of claim 2, wherein, A locking member is arranged between the arc-shaped plate (12) and the combined plate (13), and is used for fixing the bidirectional Venturi effect tube (4) in the mounting cavity, and the locking member is an elastic lock or an elastic band.

18. The free breathing machine of claim 2, wherein, Locking rings are arranged at both ends of the mounting cavity, and are used for positioning the bidirectional Venturi effect tube (4) in the mounting cavity.

19. The free breathing machine of claim 1, wherein, The holding part (2) is provided with a holding recessed section corresponding to the human hand holding posture, and the holding recessed section is located at the middle position of the holding part (2).

20. The free breathing machine of claim 1, wherein, The device further comprises counterweights, and a plurality of counterweights are detachably installed in the bottom of the holding part (2), and are used for adjusting the gravity center position of the free breathing machine in the holding state.

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