Domestic nasal and oral breathing detection device

Abstract

The application provides a household nose-mouth breathing detection device, which comprises a framework, a sensor and a controller, the framework comprises a nose clip part, a connecting part and a ventilation part, and the sensor comprises a nose airflow sensor and a total airflow sensor. The nose clip part comprises a nose clip main body and first and second side wings respectively located on both sides of the nose clip main body, and the side wings are provided with the nose airflow sensor; the connecting part is connected to the nose clip part and the ventilation part at both ends; the ventilation part is provided with a total ventilation hole and the total airflow sensor, and is configured to enable the airflow of the mouth and nose to pass through the total ventilation hole and be detected by the total airflow sensor; and the controller is connected to the nose airflow sensor and the total airflow sensor. The device is small and portable, and does not need to be operated by professionals. Through simple operation of a household user, accurate nose-mouth breathing data can be obtained, so that whether the user is a mouth breather can be conveniently and accurately judged.

Description

Technical Field

[0001] This invention relates to the field of respiratory detection technology, and in particular to a home-use nasal and oral respiratory detection device. Background Technology

[0002] Under normal circumstances, the human body primarily inhales air through the nose. In rare cases (fatigue, high-intensity exercise, or nasal congestion), the body needs to compensate for insufficient air intake by breathing through the mouth. Short-term mouth breathing does not cause adverse consequences, but if one is in a state of mouth breathing for a long time, such as due to nasal congestion, the body adapts to a long-term mouth breathing pattern, which can have adverse effects, the most typical being adenoid facies. Patients with adenoid facies have a high-arched palate, a narrow maxilla, anterior open bite, posterior crossbite, and excessively long vertical teeth. In severe cases, they may experience lethargy and poor concentration. Currently, there is an urgent need for a convenient and quick respiratory detection device to determine whether a patient is a mouth breather. Summary of the Invention

[0003] This invention provides a home-use nasal and oral breathing detection device that is small and portable, requires no professional operation, and allows home users to easily obtain accurate nasal and oral breathing data through simple operation, thereby conveniently and accurately determining whether the user is breathing through their mouth and the severity or condition of mouth breathing.

[0004] The home-use nasal and oral breathing detection device provided according to an embodiment of the present invention includes:

[0005] A skeleton, sensors, and controller with a specific structure, wherein the skeleton includes a nose clip, a connecting part, and an air passage part, and the sensors include a nasal airflow sensor and a total airflow sensor;

[0006] The nose clip includes a nose clip body and a first side wing and a second side wing located on both sides of the nose clip body. The nose clip is positioned in front of the nose via the first side wing and the second side wing. A nasal airflow sensor is disposed on the first side wing and / or the second side wing. For example, a first nasal airflow sensor is disposed on the first side wing, and a second nasal airflow sensor is disposed on the second side wing. Preferably, the first nasal airflow sensor and the second nasal airflow sensor are sensors of the same type.

[0007] In some embodiments, the first side wing and / or the second side wing are respectively provided with a ring structure, preferably, the ring structure is provided at the end of the first side wing or the second side wing.

[0008] The two ends of the connecting part are respectively connected to the nose clip and the air vent, and are configured to allow the nose clip to be located in front of the nose and the air vent to be located in front of the mouth.

[0009] The ventilation section is provided with a main ventilation port and a main airflow sensor. The main ventilation port is configured to allow airflow from the mouth and nose to pass through the main ventilation port and to be detected by the main airflow sensor.

[0010] The controller is connected to the nasal airflow sensor and the total airflow sensor, respectively.

[0011] In one embodiment, the nose clip is made of a material with malleable or cushioning damping properties.

[0012] In one embodiment, the connecting portion is hollow, and the two nasal airflow sensors are connected to the controller via wires passing through the hollow portion of the connecting portion.

[0013] In one embodiment, the main vent is located at the position corresponding to the user's inlet.

[0014] In one embodiment, the first side wing and / or the second side wing are each provided with a ring body, the ring body being configured to be built into the inside of the nostril to form a nasal vent, and the nasal airflow sensor is disposed inside the ring body.

[0015] In one embodiment, the device further includes a face mask with an opening at a position corresponding to the user's mouth, the opening being configured to be detachably and sealingly connected to the ventilation section.

[0016] In one embodiment, the controller is configured to be able to:

[0017] The system receives in real-time the nasal breathing velocity (v1, v2) measured by the nasal airflow sensor (preferably, the velocity of both nasal airflow sensors), and the total airflow velocity v measured by the total airflow sensor. T ;

[0018] Preferably, the airflow rates F1 and F2 of nasal breathing and the total airflow rate F are calculated using the following formulas. T :

[0019] F1 = v1 * S1;

[0020] F2 = v2 * S2;

[0021] F T =v T *S T ,

[0022] Wherein, S1 and S2 are the cross-sectional areas of the two nasal vents, respectively, S T It is the cross-sectional area of ​​the total vent; and

[0023] Calculate the airflow rate F3 during mouth breathing using the following formula:

[0024] F3=F T -(F1+F2).

[0025] In one embodiment, the sum of the cross-sectional areas of the two nasal vents formed by the annulus and the side wings is equal to the cross-sectional area of ​​the vent opening. In this case, the airflow velocity (v1, v2) obtained solely through nasal breathing and the total airflow velocity v measured by the total airflow sensor are considered. T Calculate the situation of mouth breathing, especially whether mouth breathing is present or not.

[0026] In one embodiment, the controller is further configured to:

[0027] Calculate (F1+F2) / F3 in real time during the first time period;

[0028] If (F1+F2) / F3 < 75% for a period longer than the second duration, the user is determined to be breathing through their mouth, and the result is sent to an external device.

[0029] The second duration is shorter than the first duration.

[0030] Furthermore, the controller is also used for:

[0031] F T =0 lasting more than 10 seconds or F T Less than normal F T 50% of the records are considered as one event, and the total number of events per hour is counted.

[0032] If the total number of events per hour is between 5 and 14, it is considered mild OSA; between 15 and 30, it is considered moderate OSA; and more than 30, it is considered severe OSA. The judgment result is then sent to the external device.

[0033] Among them, normal F T The total airflow rate is the air volume of the airflow when the user is at rest.

[0034] In one embodiment, the controller further includes a power module that supplies power to the nasal airflow sensor via a power supply line passing through the hollow portion of the connector.

[0035] In one embodiment, both the nasal airflow sensor and the total airflow sensor are based on MEMS calorimetric sensing chips. The mechanical peripheral cross-sectional area of ​​the total airflow sensor is larger than that of the nasal airflow sensor, and the suitable range of the total airflow sensor is the same as that of the nasal airflow sensor.

[0036] According to a specific embodiment of the present invention, a highly sensitive micro-sensor is integrated into a face mask structure that provides a wearing experience similar to a conventional mask, enabling portable nasal and oral breathing detection in home settings. The specific structural design of the nasal and oral breathing detection device of the present invention significantly reduces the impact on the user's breathing resistance, essentially maintaining the comfort and familiarity of wearing a conventional mask, thereby effectively avoiding interference with monitoring results caused by device discomfort or unfamiliar environment. Based on a design optimized for the home environment, the device of the present invention is particularly suitable for assessing daily nasal and oral breathing habits and for long-term, continuous home sleep apnea monitoring. Attached Figure Description

[0037] The accompanying drawings, which are part of the specification of this invention, illustrate embodiments of the invention and are used together with the description in the specification to illustrate the principles of the invention.

[0038] Figure 1 A schematic diagram of a nasal and oral breathing detection device according to an embodiment of the present invention is shown.

[0039] Figure 2 A schematic diagram of a nasal and oral breathing detection device after removing a mask, according to a certain embodiment of the present invention, is shown.

[0040] Figure 3 The diagram shows frontal and lateral views of a nasal breathing detection device according to a certain embodiment of the present invention when it is worn.

[0041] Figure 4 The diagram shows frontal and lateral views of the nasal and oral breathing detection device when it is worn after removing the mask, according to a certain embodiment of the present invention.

[0042] Figure 5 A schematic diagram of a nose clip according to an embodiment of the present invention is shown.

[0043] Figure 6 A schematic diagram of an airflow sensor according to an embodiment of the present invention is shown.

[0044] Figure 7 A schematic diagram of a controller according to an embodiment of the present invention is shown. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the spirit of the contents disclosed in the present invention will be clearly explained below with reference to the accompanying drawings and detailed description. After understanding the embodiments of the present invention, any person skilled in the art can make changes and modifications based on the technology taught in the present invention without departing from the spirit and scope of the present invention.

[0046] The illustrative embodiments and descriptions of the present invention are used to explain the invention, but are not intended to limit the invention. Furthermore, elements / components using the same or similar reference numerals in the drawings and embodiments are used to represent the same or similar parts.

[0047] The terms "first," "second," etc., used in this document are not intended to specifically refer to order or sequence, nor are they intended to limit the invention. They are merely used to distinguish elements or operations described using the same technical terms.

[0048] The terms “include,” “including,” “have,” “contain,” etc., used in this article are all open-ended terms, meaning that they include but are not limited to.

[0049] The term "and / or" as used herein includes any or all of the things mentioned.

[0050] The term "multiple" in this article includes "two" and "more than two"; the term "multiple groups" in this article includes "two groups" and "more than two groups".

[0051] Certain terms used to describe the invention will be discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art in the description of the invention.

[0052] This invention provides a home-use nasal and oral breathing detection device that is small and portable and requires no professional operation. It allows home users to easily obtain accurate nasal and oral breathing data, thereby conveniently and accurately determining whether the user is breathing through their mouth.

[0053] Figure 1 A schematic diagram of a nasal and oral breathing detection device according to an embodiment of the present invention is shown. Figure 2 A schematic diagram of a nasal and oral breathing detection device after removing a mask, according to a certain embodiment of the present invention, is shown. Figure 3 The diagram shows frontal and lateral views of a nasal breathing detection device according to a certain embodiment of the present invention when it is worn. Figure 4 The diagram shows frontal and lateral views of the nasal and oral breathing detection device when it is worn after the mask has been removed, according to a certain embodiment of the present invention. Figure 5 A schematic diagram of a nose clip according to an embodiment of the present invention is shown. Figure 1-4 As shown, a home-use nose and mouth detection device according to a certain embodiment of the present invention includes: a nose clip 1, a connecting part 2, an air vent 3, a controller, and a mask 4.

[0054] like Figure 5As shown, the nose clip 1 includes a nose clip body 11 and a first side wing and a second side wing located on both sides of the nose clip body 11. Each side wing is provided with a ring 12. The first side wing and the ring 12 thereon form a nasal vent 13, and a nasal airflow sensor 14 is provided on the inner wall of the nasal vent 13. Similarly, the second side wing and the ring thereon also form a nasal vent, and a nasal airflow sensor is provided on the inner wall of the nasal vent. Preferably, the rings on the first and second side wings are of the same size, thereby ensuring that the two nostrils are the same size, and thus controlling the standardization of airflow measurement between the two nostrils.

[0055] In one embodiment, the home-use nose and mouth detection device is divided into different models based on the size of the ring 12. The size of the ring 12 is determined according to the target population, gender, or age. For example, the ring 12 for young children is smaller, and the corresponding nose and mouth detection device model is small, such as size M. Conversely, the ring 12 for adults is larger, and the corresponding nose and mouth detection device model is large, such as size L.

[0056] In this invention, at least the distal portions of the first and second side wings are configured to enter the interior of the nostrils, and the nose clip 1 is fixed or positioned in front of the nose by, for example, the force exerted between the first and second side wings to bring them closer together. The lengths of the first and second side wings are not limited, as long as sufficient friction is achieved to fix or position the nose clip 1.

[0057] In this invention, the shapes of the first and second side wings are not limited, and they are generally elongated and protrude from the same side of the main body. Furthermore, the thickness of the first and second side wings is not limited; a smaller thickness is preferred without affecting the clamping effect, thereby minimizing the impact of thickness on nasal ventilation. Although Figure 5 The outer sides (i.e., the side away from the opposite side) of the first and second side wings are shown to be planar, but those skilled in the art can fully expect that the outer sides of the first and second side wings can be set as curved surfaces, especially concave curved surfaces, so as to form a circular or near-circular through hole with the ring body 12.

[0058] In one embodiment, the ring 12 provided by the first and second side wings of the present invention extends a specific length along the length direction of the side wings, thereby increasing the contact area between the outer side of the ring 12 and the inner wall of the nostril, and thus increasing the friction.

[0059] In one embodiment, the ring body 12 of the present invention is integrally formed with the first side wing and / or the second side wing, or is formed separately and then assembled to form a nasal vent.

[0060] like Figure 1-4As shown, the two ends of the connecting part 2 are connected to the nose clip part 1 and the ventilation part 3, respectively. The ventilation part 3 is provided with a main ventilation hole 31, and a main airflow sensor 32 is provided on the inner wall of the main ventilation hole 31. A controller is provided on the ventilation part 3, and both the two nasal airflow sensors 14 and the main airflow sensor 32 are connected to the controller. The mask 4 is detachably connected to the ventilation part 3. Preferably, the cross-sectional area of ​​the main ventilation hole is greater than the cross-sectional area of ​​the two nostrils or the sum of the cross-sectional areas of the two through holes formed by the ring and the side wings.

[0061] like Figure 3-4 As shown, during use, the user wears the nose and mouth detection device on their face. First, the nose clip 1 is placed on the nose, and the two rings 12 are placed in the nostrils on both sides. Then, the mask 5 is worn snugly against the face. In this way, the mask 5 fits well against the face, so that the user's inhaled and exhaled airflow can only pass through the main vent 31 of the ventilation section 3. Inhaled air can be inhaled into the user's body through the mouth or nose, and exhaled air can be exhaled through the mouth or nose and then discharged through the main vent 31.

[0062] In one embodiment, the nose clip 1 is made of a material with malleable or cushioning damping properties. For example, the nose clip 1 can be made of rubber. Thus, the nose clip 1 has good malleability, allowing the ring 12 of the nose clip 1 to adapt well to the size differences of the human nasal cavity, whether for adults or children. Furthermore, the malleability of the nose clip 1 allows for a tight seal between the ring 12 and the nasal cavity, resulting in more accurate measurements of inhaled and exhaled air. Simultaneously, the friction between the ring 12 and the nasal cavity ensures that the ring 12 is stably and securely positioned within the nostril, preventing displacement or detachment during use.

[0063] The nose clip 1 of this invention is compact in size, adaptable to the facial differences of adults and children, and the nose clip is located outside the nostril / vestibule, so no additional tubing is required and the user's natural breathing is not affected.

[0064] The nasal airflow sensor 14 can be embedded in the inner wall of the nasal vent 13. For example, a groove is provided on the inner wall so that the nasal airflow sensor 14 is embedded in the groove, and the sensor surface and the inner wall surface form a smooth surface.

[0065] In one embodiment, the connecting part 2 of the present invention serves both to connect the nose clip 1 and the air passage 3, and to support the entire device. The material of the connecting part 2 can be the same as or different from that of the nose clip 1. In one embodiment, the connecting part 2 is made of a flexible material such as aluminum, allowing it to be adapted to the curvature of the user's nose bridge by, for example, manually bending the connecting part 2. In one embodiment, the connecting part 2 can be hollow. The nasal airflow sensor 14 is connected to the controller via a wire that passes through the hollow portion of the connecting part 2. This creates an isolation cavity by the connecting part, blocking the influence of respiratory moisture, condensation, and saliva on the wire, thereby improving the device's corrosion resistance and short-circuit protection. The connecting part 2 can be configured as a hollow conduit through which the two wires corresponding to the two nasal airflow sensors pass. Figure 2 and Figure 4 As shown, the connecting part 2 can also be configured to include two hollow tubes, through which the two wires corresponding to the two nasal airflow sensors pass respectively. In one embodiment, the connecting part 2 can also be configured as a hollow block to better serve a supporting function.

[0066] The ventilation section 3 is connected to the connecting section 2. The material of the ventilation section 3 can be the same as or different from that of the nose clip section 1. In one embodiment, the ventilation section 3 is made of plastic. In the entire nasal breathing detection device, the ventilation section 3, having the main ventilation hole 31, is a relatively ventilated and dry area. Therefore, the controller is mounted on the ventilation section 3, that is, the controller adopts a vent embedded design, which can keep the controller dry, block the influence of breathing moisture, condensation, and saliva on the controller, make the controller measurement data more accurate, and extend the life of the controller.

[0067] The total airflow sensor 32 can be embedded in the inner wall of the main vent 31. For example, a groove is provided in the inner wall of the main vent 31, the total airflow sensor 32 is placed in the groove, and the surface of the total airflow sensor 32 is smooth with the surface of the inner wall.

[0068] The mask 4 may include a mask body 41 and two straps 42, which can be worn by hanging the straps 42 over the ears, allowing the mask 4 to fit snugly against the face. The material of the mask 4 can be the same as that of ordinary masks, such as meltblown fabric or non-woven fabric. This ensures the comfort of wearing the mask 4, allowing the user to obtain breathing data that is more consistent with the user's normal breathing in a comfortable environment. The mask 4 has an opening to allow for detachable connection between the mask 4 and the ventilation section 3. When the ventilation section 3 is connected to the mask 4, the ventilation section 3 and the mask 4 are sealed together. The opening of the mask 4 may be provided with a ring that fits into the main ventilation port 31, thereby detachably connecting to the main ventilation port 31 by means of a buckle, for example. The ring may be made of an elastic material such as rubber to achieve a sealed connection with the ventilation section 3. In one embodiment, the opening of the mask 4 and the main ventilation port 31 may be located at the position corresponding to the user's mouth.

[0069] As shown above, the mask 4 is detachably connected to the other components of the nasal and oral breathing detection device. Users can easily replace the mask 4, while the other components can be reused, which ensures cleanliness and saves costs.

[0070] In this embodiment of the invention, the nasal airflow sensor 14 measures the airflow rate of the user's nasal breathing in real time, and the total airflow sensor 32 measures the airflow rate of the user's total airflow in real time. Both the nasal airflow sensor 14 and the total airflow sensor 32 can be MEMS-based calorimetric sensing chips. Figure 6 As shown, the sensor chip incorporates a heating element and dual-sided temperature sensing elements. It converts the temperature gradient into a voltage signal via a Wheatstone bridge, establishing a voltage-flow mapping model to quantify the airflow rate. Since the airflow velocity passing through the total airflow sensor 32 is greater than that of the nasal airflow sensor 14, in one embodiment, the mechanical peripheral cross-sectional area of ​​the total airflow sensor 32 can be set to be larger than that of the nasal airflow sensor 14. Simultaneously, the suitable measurement range of the total airflow sensor 32 is the same as that of the nasal airflow sensor 14 to achieve more accurate measurement. The airflow velocity measured by the nasal airflow sensor 14 and the total airflow sensor 32 are transmitted to the controller in real time via wires.

[0071] In one embodiment of the invention, the nasal airflow sensor 14 and the total airflow sensor 32 are bidirectional flow rate measurement sensors, capable of measuring both inhaled and exhaled airflow rates. The airflow rate transmitted to the controller can be only the inhaled airflow rate, only the exhaled airflow rate, or both inhaled and exhaled airflow rates.

[0072] like Figure 7As shown, the controller can be an MCU control module, which includes a signal reading module, an ADC module, an MCU main control chip, and a wireless transmission module. First, the signal reading module reads the flow velocity signals from three airflow sensors in real time, and outputs a voltage signal after amplification and filtering circuits. Then, the ADC module converts the voltage signal into a digital signal. The MCU main control chip calculates the nasal and oral breathing parameters based on the digital signals converted from the three flow velocity signals, and sends the nasal and oral breathing parameters to external devices through the wireless transmission module.

[0073] Specifically, the controller obtains the nasal breathing velocities v1 and v2 measured by the two nasal airflow sensors 14 and the total airflow velocity v measured by the total airflow sensor 32. T Then, the airflow rates F1 and F2 of nasal breathing and the total airflow rate F are calculated using the following formulas. T :

[0074] F1 = v1 * S1;

[0075] F2 = v2 * S2;

[0076] F T =v T *S T ,

[0077] Wherein, S1 and S2 are the cross-sectional areas of the two nasal vents 13, respectively, S T It is the cross-sectional area of ​​the main vent 31.

[0078] Calculate the airflow rate F3 during mouth breathing using the following formula:

[0079] F3=F T -(F1+F2).

[0080] In one implementation, the controller can send the aforementioned nasal-oral breathing parameters F1, F2, and F3 to an external device, or send the nasal breathing parameters F1+F2 and the oral breathing parameter F3 to an external device. The controller can send data to the external device in real time or at specific time intervals.

[0081] Alternatively, the controller can directly send the judgment result to an external device.

[0082] In one implementation, the controller calculates (F1+F2) / F3 in real time during a first duration. If (F1+F2) / F3 < 75% for a period longer than a second duration, it determines that the user is breathing through their mouth and sends the result to an external device. The second duration is shorter than the first duration. The first duration can be, for example, from 10 PM to 7 AM the next day, or the time from when the user puts on the mask to when they remove it. The second duration can be, for example, 50% of the first duration.

[0083] In one implementation, the controller can also perform sleep apnea (OSA) detection. (The last part, "F," appears to be an unrelated fragment and is omitted from the translation.) T =0 lasting more than 10 seconds or F T Less than normal F T 50% (normal F) T The total ventilation volume at rest is recorded as one event, and the total number of events per hour is counted. If the total number of events per hour is between 5 and 14, it is considered mild OSA; between 15 and 30, moderate OSA; and greater than 30, severe OSA. The controller can send the judgment results to an external device. Thus, continuous sleep apnea can be detected in a home environment while simultaneously monitoring nasal and oral breathing.

[0084] The controller may also include a power module that supplies power to the nasal airflow sensor 14 and the total airflow sensor 32 via power lines. Similarly, the power line leading to the nasal airflow sensor 14 may be encased within the hollow portion of the connector 2 to block the influence of respiratory moisture, condensation, and saliva on the power line. In one embodiment, the power module is a rechargeable lithium battery.

[0085] As described above, the nasal and oral breathing detection device integrates a highly sensitive miniature sensor into a face mask structure that provides a wearing experience similar to a conventional mask, enabling portable nasal and oral breathing detection in home settings. Detection data is transmitted to an external terminal device via a low-power wireless transmission module. The device's structural design significantly reduces the impact on the user's breathing resistance, maintaining a level of comfort and familiarity similar to wearing a conventional mask, thus effectively avoiding interference with monitoring results caused by device discomfort or unfamiliar environments. The sensor used possesses high sensitivity and accuracy, ensuring the authenticity and reliability of the collected data. Based on its design optimized for the home environment, this device is particularly suitable for assessing daily nasal and oral breathing habits and for long-term, continuous home sleep apnea monitoring.

[0086] The above description is merely an illustrative embodiment of the present invention. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principles of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A home-use nasal and oral breathing detection device, characterized in that, The system includes a frame, sensors, and a controller. The frame includes a nasal clip, a connecting part, and an airway. The sensors include a nasal airflow sensor and a total airflow sensor. The nose clip includes a nose clip body and a first side wing and a second side wing located on both sides of the nose clip body. The nose clip is positioned in front of the nose by means of the first side wing and the second side wing. The first side wing and / or the second side wing are provided with nasal airflow sensors. The two ends of the connecting part are respectively connected to the nose clip and the air vent, and are configured to allow the nose clip to be located in front of the nose and the air vent to be located in front of the mouth. The ventilation section is provided with a main ventilation port and a main airflow sensor. The main ventilation port is configured to allow airflow from the mouth and nose to pass through the main ventilation port and to be detected by the main airflow sensor. The controller is connected to the nasal airflow sensor and the total airflow sensor, respectively.

2. The apparatus according to claim 1, characterized in that, The nose clip is made of a malleable material or a material with cushioning and damping properties.

3. The apparatus according to claim 1, characterized in that, The connecting part is hollow, and the nasal airflow sensor is connected to the controller via a wire that passes through the hollow part of the connecting part.

4. The apparatus according to claim 1, characterized in that, The first side wing and / or the second side wing are each provided with a ring body, the ring body being configured to be built into the inside of the nostril to form a vent, and the nasal airflow sensor is disposed inside the ring body.

5. The apparatus according to claim 4, characterized in that, The device further includes a face mask with an opening at a position corresponding to the mouth, the opening being configured to be detachably and sealingly connected to the ventilation section.

6. The apparatus according to claim 1, characterized in that, The controller is configured to: The system receives in real-time the nasal breathing velocity (v1, v2) measured by the nasal airflow sensor and the total airflow velocity v measured by the total airflow sensor. T ; The following formula is used to calculate the airflow rates F1 and F2 for nasal breathing and the total airflow rate F. T : F1 = v1 * S1; F2 = v2 * S2; F T =v T *S T , Where S1 and S2 are the cross-sectional areas of the two nasal vents, S T It is the cross-sectional area of ​​the total vent; and Calculate the airflow rate F3 during mouth breathing using the following formula: F3=F T -(F1+F2)。 7. The apparatus according to claim 6, characterized in that, The controller is also configured to: Calculate (F1+F2) / F3 in real time during the first time period; If (F1+F2) / F3 < 75% for a period longer than the second duration, the user is determined to be breathing through their mouth, and the result is sent to an external device. The second duration is shorter than the first duration.

8. The apparatus according to claim 6, characterized in that, The controller is also configured to: F T =0 lasting more than 10 seconds or F T Less than normal F T 50% of the records are considered as one event, and the total number of events per hour is counted. If the total number of events per hour is between 5 and 14, it is considered mild OSA; between 15 and 30, it is considered moderate OSA; and more than 30, it is considered severe OSA. The judgment result is then sent to the external device. Among them, normal F T The total airflow rate is the air volume of the airflow when the user is at rest.

9. The apparatus according to claim 3, characterized in that, The controller also includes a power module that supplies power to the nasal airflow sensor and / or the total airflow sensor via a power supply line that passes through the hollow portion of the connector.

10. The apparatus according to claim 1, characterized in that, The nasal airflow sensor and the total airflow sensor each include a MEMS calorimetric sensing chip. The mechanical peripheral cross-sectional area of ​​the total airflow sensor is larger than that of the nasal airflow sensor. The suitable range of the total airflow sensor is the same as that of the nasal airflow sensor.

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