Airflow limitation event detection method, device and sleep screening device

Abstract

The present application provides a method for detecting airflow limitation events, comprising: obtaining the inspiratory phase peak value and inspiratory phase time corresponding to each respiratory cycle in real time; obtaining a first duration based on the duration of the inspiratory phase amplitude corresponding to each respiratory cycle being greater than a first signal, wherein the first signal is a first amplitude signal obtained based on the inspiratory phase peak value, the first amplitude signal being obtained by multiplying the inspiratory phase peak value by a first preset coefficient, the first preset coefficient being less than 1; comparing the first duration with a first preset time, wherein the first preset time is the proportion of the inspiratory phase time when the inspiratory phase signal is in a normal state; and determining that airflow limitation occurs when the first duration exceeds the first preset time. The technical solution of the present application can more conveniently detect airflow limitation events.

Description

Technical Field

[0001] The present application relates to the field of medical technology, and in particular to a method for detecting airflow limitation events, a device for detecting airflow limitation events, and a sleep screening device. Background Art

[0002] Airflow limitation (FlowLimit) is caused by partial closure of the airway during breathing, resulting in poor airflow. Airflow limitation is relatively hidden and difficult to detect, making it an important parameter monitored by sleep screening devices.

[0003] Current methods for detecting airflow limitation typically require monitoring parameter changes over multiple consecutive respiratory cycles, which is complex and leads to delayed and poor real-time detection results. Summary of the Invention

[0004] In view of this, it is necessary to provide a more convenient method for detecting airflow limitation events, a computer-readable storage medium, and a sleep screening device.

[0005] In a first aspect, embodiments of the present application provide a method for detecting an airflow limitation event, the method comprising the following steps:

[0006] Obtain the inspiratory phase peak and inspiratory phase time corresponding to each respiratory cycle in real time;

[0007] Obtaining a first duration according to statistics of the duration during which the inspiratory phase amplitude corresponding to each respiratory cycle is greater than a first signal, wherein the first signal is a first amplitude signal obtained according to the inspiratory phase peak value, and the first amplitude signal is obtained by multiplying the inspiratory phase peak value by a first preset coefficient, and the first preset coefficient is less than 1;

[0008] Comparing the first duration with a first preset time, where the first preset time is the proportion of the inspiratory phase time when the inspiratory phase signal is in a normal state;

[0009] When the first duration exceeds a first preset time, it is determined that airflow is limited.

[0010] In a second aspect, an embodiment of the present application provides a device for detecting an airflow limitation event, wherein the device for detecting an airflow limitation event specifically includes:

[0011] An acquisition module is used to obtain the inspiratory phase peak and inspiratory phase time corresponding to each respiratory cycle in real time;

[0012] a first statistical module, configured to obtain a first duration by counting the duration during which the inspiratory phase amplitude corresponding to each respiratory cycle is greater than a first signal, wherein the first signal is a first amplitude signal obtained according to the inspiratory phase peak value, the first amplitude signal being obtained by multiplying the inspiratory phase peak value by a first preset coefficient, and the first preset coefficient being less than 1;

[0013] a first comparing module, configured to compare the first duration with a first preset time, where the first preset time is the proportion of the inspiratory phase time when the inspiratory phase signal is in a normal state;

[0014] The first judgment module is configured to judge that the airflow is limited when the first duration exceeds a first preset time.

[0015] In a third aspect, an embodiment of the present application provides a device for detecting an airflow limitation event, wherein the device for detecting an airflow limitation event specifically includes:

[0016] a second determining module, configured to determine, when the first duration does not exceed the first preset time, whether the first duration exceeds a second preset time, the second preset time being shorter than the first preset time;

[0017] a second statistical module, configured to, when the first duration does not exceed a second preset time, calculate a duration during which the inspiratory phase amplitude is greater than a second signal to obtain a second duration, where the second signal is a second amplitude signal obtained based on the inspiratory phase peak value, the second amplitude signal being obtained by multiplying the inspiratory phase peak value by a second preset coefficient, where the second preset coefficient is less than 1 and the first preset coefficient is greater than the second preset coefficient;

[0018] a second comparing module, configured to compare the second duration with a first preset time;

[0019] a second judgment module, configured to judge that the airflow is limited when the second duration reaches a first preset time;

[0020] The third judgment module is configured to judge that the condition is not airflow limitation when the second duration does not reach a first preset time.

[0021] In a fourth aspect, an embodiment of the present application provides a sleep screening device, which includes: a computer-readable storage medium for storing program instructions, a processor and a bus for executing the program instructions to implement the above-mentioned method for detecting airflow limitation events.

[0022] The above-mentioned airflow limitation event detection method, airflow limitation event detection device and sleep screening device can simply and easily perform detection by detecting the amplitude of the respiratory cycle and the preset time characteristics corresponding to the amplitude in real time, and can quickly and easily detect airflow limitation respiratory events in real time. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0024] Figure 1 This is a flow chart of a method for detecting airflow limitation events provided in an embodiment of the present application.

[0025] Figure 2 This is a first sub-flowchart of the method for detecting airflow limitation events provided in an embodiment of the present application.

[0026] Figure 3 This is a second sub-flowchart of the method for detecting an airflow limitation event provided in an embodiment of the present application.

[0027] Figure 4 This is a third sub-flowchart of the method for detecting an airflow limitation event provided in an embodiment of the present application.

[0028] Figure 5 This is a fourth sub-flowchart of the method for detecting an airflow limitation event provided in an embodiment of the present application.

[0029] Figure 6 Schematic diagram of a device for detecting airflow limitation events provided in an embodiment of the present application.

[0030] Figure 7 Schematic diagram of a device for detecting airflow limitation events provided in an embodiment of the present application.

[0031] Figure 8 Schematic diagram of the internal structure of the sleep screening device provided in an embodiment of the present application.

[0032] The realization of the objectives, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of this application more clear, the present application is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0034] The terms "first," "second," "third," "fourth," and the like (if any) in the specification and claims of this application and in the accompanying drawings are used to distinguish similar program objects and are not necessarily used to describe a particular order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate. In other words, the described embodiments are implemented according to an order other than that illustrated or described herein. In addition, the terms "including" and "having," and any variations thereof, may also encompass other content. For example, a process, method, system, product, or apparatus comprising a series of steps or units need not be limited to only those steps or units explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to these processes, methods, products, or apparatus.

[0035] It should be noted that the descriptions of "first", "second", etc. in this application are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include one or more of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that ordinary technicians in this field can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0036] Please refer to Figure 1 , which is a flow chart of a method for detecting an airflow limitation event provided in an embodiment of the present application. The method for detecting an airflow limitation event specifically includes the following steps S102-S108.

[0037] Step S102: Acquire the inspiratory phase peak value and inspiratory phase time corresponding to each respiratory cycle in real time. It is understood that the sleep monitor acquires the user's respiratory signal in real time, monitors the respiratory cycle corresponding to each respiratory signal when acquiring the respiratory signal, and calculates the inspiratory phase peak value and inspiratory phase time corresponding to each respiratory cycle in real time when acquiring each respiratory cycle.

[0038] In step S104, a first duration is obtained by counting the duration of time that the inspiratory phase amplitude is greater than a first signal corresponding to each respiratory cycle. The first signal is a first amplitude signal obtained based on the inspiratory phase peak value. The first amplitude signal is obtained by multiplying the inspiratory phase peak value by a first preset coefficient, where the first preset coefficient is less than 1. It is understood that the user pre-sets the first preset coefficient in the sleep monitor to determine whether the inspiratory phase amplitude is greater than the first signal after obtaining each respiratory cycle. When the inspiratory phase amplitude is greater than the first signal, the duration of time that the inspiratory phase amplitude is greater than the first signal is obtained. This duration is expressed as: InspAmp(i)>Peak*Peak_Thr1 (Formula 1), where InspAmp(i) is the inspiratory phase amplitude and Peak_Thr1 is the first preset coefficient. The value range of the first preset coefficient is between 0.5 and 1.

[0039] Step S106 compares the first duration with a first preset time, where the first preset time is the proportion of the inspiratory phase time when the inspiratory phase signal is in a normal state. It is understood that to determine whether the user experiences airflow limitation during breathing, it is determined whether the first duration exceeds the first preset time. This determination is expressed as: Time1 > InspTime * Thr1 (Formula 2), where Time1 is the first duration, InspTime is the inspiratory phase time, and Thr1 is the first preset threshold.

[0040] Step S108: If the first duration exceeds a first preset time, airflow limitation is determined. It is understood that the first duration is the duration of time during which the inspiratory phase amplitude is greater than the first signal. If the user's breathing state remains at this breathing amplitude, it indicates abnormal breathing, i.e., airflow limitation.

[0041] In the above embodiment, by detecting the amplitude of each respiratory cycle and the preset time characteristics corresponding to the amplitude in real time, the detection can be simple and easy to implement, and the detection of airflow-limited respiratory events can be realized quickly and in real time.

[0042] Please refer to Figure 2 , which is the first sub-flowchart of the method for detecting airflow limitation events provided in an embodiment of the present application, and specifically includes the following steps S202-S210.

[0043] Step S202: When the first duration does not exceed the first preset time, determining whether the first duration exceeds a second preset time, where the second preset time is shorter than the first preset time. It is understood that when the first duration does not exceed the first preset time, the threshold corresponding to detecting inhalation is lowered to obtain a second preset time, and determining whether the first duration is less than the second preset time. Determining whether the first duration exceeds the second preset time is expressed by the formula: Time1 > InspTime * Thr2 (Formula 3), where Time1 is the first duration, InspTime is the inspiratory phase time, and Thr2 is the second preset threshold.

[0044] In step S204, when the first duration does not exceed the second preset time, the duration of time during which the inspiratory phase amplitude is greater than a second signal is counted to obtain a second duration. The second signal is a second amplitude signal obtained based on the inspiratory phase peak value. The second amplitude signal is obtained by multiplying the inspiratory phase peak value by a second preset coefficient, wherein the second preset coefficient is less than 1 and the first preset coefficient is greater than the second preset coefficient. It is understood that when it is determined that the first duration does not exceed the second preset time, the second preset coefficient is obtained for determination. The second signal is obtained by multiplying the second preset coefficient by the inspiratory phase peak value. The second duration is obtained by using the second signal to obtain the duration of breaths with an amplitude greater than the second signal. This is expressed as follows: InspAmp(i) > Peak * Peak_Thr2 (Formula 4), where InspAmp(i) is the inspiratory phase amplitude and Peak_Thr2 is the second preset coefficient. The second preset coefficient ranges from 0.5 to 1.

[0045] Step S206 compares the second duration with the first preset time. It is understood that to detect whether the second duration exceeds the first preset time, that is, to compare whether the second duration indicates excessive breathing, the formula is: Time2 > InspTime * Thr1 (Formula 5), ​​where Time2 is the second duration, InspTime is the inspiratory phase time, and Thr1 is the first preset threshold.

[0046] Step S208: When the second duration reaches the first preset time, it is determined to be airflow limitation. It can be understood that if the second duration exceeds the first preset time, it means that the second duration is too long compared to normal breathing duration, that is, airflow limitation occurs.

[0047] Step S210: When the second duration does not reach the first preset time, it is determined that the user is not experiencing airflow limitation. It is understandable that if the second duration does not reach the first preset time, it indicates that the user's breathing state is normal, and the user is determined to be not experiencing airflow limitation.

[0048] Please refer to Figure 3 , which is a second sub-flowchart of the method for detecting airflow limitation events provided in an embodiment of the present application. Step S206 specifically includes the following steps S302-S306.

[0049] Step S302: Obtain the second duration. After the sleep screening device completes calculating the second duration, the second duration is obtained.

[0050] In step S304, each inspiratory phase time is multiplied by a first preset threshold to obtain a first preset time. It can be understood that, according to the formula InspTime*Thr1 (Formula 6), where InspTime is the inspiratory phase time and Thr1 is the first preset threshold, the first preset time is obtained by multiplying the inspiratory phase time by the first preset threshold.

[0051] Step S306: Compare the second duration to see if it exceeds the first preset time. It is understandable that by comparing the second duration to see if it exceeds the first preset time, it can be determined whether there is airflow limitation in the second duration.

[0052] Please refer to Figure 4 , which is the third sub-flowchart of the method for detecting airflow limitation events provided in an embodiment of the present application. Step S102 specifically includes the following steps S402-S406.

[0053] Step S402: Acquire continuous breathing signals in real time. It is understandable that the sleep screening device will acquire the user's continuous breathing signals in real time when the user uses it.

[0054] Step S404: bandpass filter the acquired respiratory signal to obtain a target respiratory signal. It is understood that in order to avoid affecting the test effect, only the desired respiratory signal is retained. When the continuous respiratory signal is acquired, the respiratory signal is filtered to ensure that the respiratory signal has no interference factors.

[0055] Step S406: Detect the respiratory signal to obtain the inspiratory phase time and inspiratory phase peak value corresponding to each respiratory cycle. It is understood that the sleep screening device will detect the respiratory cycle corresponding to each respiratory signal obtained, and obtain the inspiratory phase time and inspiratory phase peak value corresponding to the respiratory cycle based on the respiratory cycle.

[0056] Please refer to Figure 5 , which is the fourth sub-flowchart of the method for detecting airflow limitation events provided by the embodiment of the present application. Step S106 specifically includes the following steps S502-S506.

[0057] Step S502: Obtain the first duration. It is understandable that the first duration is obtained after the sleep screening device completes the calculation of the first duration.

[0058] Step S504: Calculate the time of each inspiratory phase and the first preset time threshold to obtain the first preset time. It is understandable that the same applies to step S304.

[0059] Step S506: Compare the first duration to see if it exceeds the first preset time. It is understandable that by comparing the first duration to see if it exceeds the first preset time, it can be determined whether there is airflow limitation during the first duration.

[0060] Please refer to Figure 6 , which is a detection device for airflow limitation events provided in an embodiment of the present application, the detection device 1000 for airflow limitation events includes an acquisition module 100, a first statistics module 200, a first comparison module 300 and a first judgment module 400.

[0061] The acquisition module 100 is used to acquire the inspiratory phase peak value and inspiratory phase time corresponding to each respiratory cycle in real time.

[0062] The first statistical module 200 is used to obtain a first duration based on the duration of the inspiratory phase amplitude corresponding to each respiratory cycle being greater than the first signal, where the first signal is a first amplitude signal obtained based on the inspiratory phase peak value, and the first amplitude signal is obtained by multiplying the inspiratory phase peak value by a first preset coefficient, where the first preset coefficient is less than 1.

[0063] The first comparison module 300 is configured to compare the first duration with a first preset time, where the first preset time is the proportion of the inspiratory phase time when the inspiratory phase signal is in a normal state.

[0064] The first judgment module 400 is configured to judge that the airflow is limited when the first duration exceeds a first preset time.

[0065] Please refer to Figure 7 , which is a detection device for airflow limitation events provided in an embodiment of the present application, the detection device 1000 for airflow limitation events further includes a second judgment module 500, a second statistical module 600, a second comparison module 700, a second judgment module 800 and a third judgment module 900.

[0066] The second judgment module 500 is configured to judge whether the first duration exceeds a second preset time when the first duration does not exceed a first preset time, where the second preset time is shorter than the first preset time.

[0067] A second statistical module 600 is configured to, when the first duration does not exceed a second preset time, calculate a second duration by counting the duration during which the inspiratory phase amplitude is greater than a second signal, where the second signal is a second amplitude signal obtained based on the inspiratory phase peak value, and the second amplitude signal is obtained by multiplying the inspiratory phase peak value by a second preset coefficient, where the second preset coefficient is less than 1 and the first preset coefficient is greater than the second preset coefficient.

[0068] The second comparison module 700 is configured to compare the second duration with a first preset time.

[0069] The second judgment module 800 is configured to judge that the airflow is limited when the second duration reaches a first preset time.

[0070] The third judgment module 900 is configured to judge that the condition is not airflow limited when the second duration does not reach a first preset time.

[0071] Please refer to Figure 8 , which is a schematic diagram of the internal structure of the sleep screening device provided in an embodiment of the present application. The sleep screening device 10 includes a computer-readable storage medium 11, a processor 12, and a bus 13. Among them, the computer-readable storage medium 11 includes at least one type of readable storage medium, and the readable storage medium includes a flash memory, a hard disk, a multimedia card, a card-type memory (for example, SD or DX memory, etc.), a magnetic memory, a disk, an optical disk, etc. In some embodiments, the computer-readable storage medium 11 can be an internal storage unit of the sleep screening device 10, such as a hard disk of the sleep screening device 10. In other embodiments, the computer-readable storage medium 11 can also be an external storage device of the sleep screening device 10, such as a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), etc. equipped on the sleep screening device 10. Furthermore, the computer-readable storage medium 11 can also include both the internal storage unit of the sleep screening device 10 and an external storage device. The computer-readable storage medium 11 can be used not only to store application software and various data installed in the sleep screening device 10 , but also to temporarily store data that has been output or is to be output.

[0072] The bus 13 may be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 8 Only one thick line is used in the diagram, but this does not mean that there is only one bus or one type of bus.

[0073] Furthermore, the sleep screening device 10 may also include a display component 14. The display component 14 may be a light emitting diode (LED) display, a liquid crystal display (LCD), a touch-sensitive liquid crystal display (LCD), or an organic light emitting diode (OLED) touchscreen. The display component 14 may also be appropriately referred to as a display device or display unit, and is used to display information processed by the sleep screening device 10 and to display a visual user interface.

[0074] Furthermore, the sleep screening device 10 may also include a communication component 15. The communication component 15 may optionally include a wired communication component and / or a wireless communication component, such as a WI-FI communication component, a Bluetooth communication component, etc., and is generally used to establish a communication connection between the sleep screening device 10 and other intelligent control devices.

[0075] In some embodiments, the processor 12 can be a central processing unit (CPU), a controller, a microcontroller, a microprocessor, or other data processing chip, configured to execute program code or process data stored in the computer-readable storage medium 11. Specifically, the processor 12 executes a processing program to control the sleep screening device 10 to implement a method for detecting airflow limitation events.

[0076] Understandably, Figure 8 Only the sleep screening device 10 having components 11-15 and a method for detecting airflow limitation events is shown. It will be understood by those skilled in the art that Figure 8 The structure shown does not constitute a limitation on the sleep screening device 10, and may include fewer or more components than shown in the figure, or combine certain components, or arrange the components differently.

[0077] Obviously, those skilled in the art may make various modifications and variations to this application without departing from the spirit and scope of this application. Thus, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application is intended to include such modifications and variations.

[0078] The above examples are merely preferred embodiments of the present application and are not intended to limit the scope of the present application. Therefore, equivalent changes made according to the claims of the present application are still within the scope of the present application.

Claims

1. A method for detecting an airflow limitation event, characterized in that: The method for detecting an airflow limitation event comprises: Obtain the inspiratory phase peak and inspiratory phase time corresponding to each respiratory cycle in real time; a first duration obtained by counting the duration of the inspiratory phase amplitude corresponding to each respiratory cycle being greater than the first signal, wherein the first signal is a first amplitude signal obtained based on the inspiratory phase peak value, the first amplitude signal being obtained by multiplying the inspiratory phase peak value by a first preset coefficient, the first preset coefficient being less than 1, and the first signal being obtained by a user by presetting the first preset coefficient in a sleep monitor; Comparing the first duration with a first preset time, where the first preset time is the proportion of the inspiratory phase time when the inspiratory phase signal is in a normal state; When the first duration exceeds a first preset time, it is determined to be airflow limitation; The method further comprises: When the first duration does not exceed a first preset time, determining whether the first duration exceeds a second preset time, the second preset time being shorter than the first preset time; When the first duration does not exceed a second preset time, a second duration is obtained by counting the duration during which the inspiratory phase amplitude is greater than a second signal, where the second signal is a second amplitude signal determined according to the inspiratory phase peak value, and the second amplitude signal is obtained by multiplying the inspiratory phase peak value by a second preset coefficient, where the second preset coefficient is less than 1 and the first preset coefficient is greater than the second preset coefficient; comparing the second duration with a first preset time; When the second duration reaches a first preset time, it is determined to be airflow limitation; When the second duration does not reach the first preset time, it is determined that there is no airflow limitation.

2. The method for detecting an airflow limitation event according to claim 1, wherein: The comparing the second duration with the first preset time specifically includes: Get the second duration; Calculating each inspiratory phase time and a first preset threshold to obtain a first preset time; Compare the second duration to see whether it exceeds the first preset time.

3. The method for detecting an airflow limitation event according to claim 1, wherein: The calculation formula for obtaining the second duration by counting the duration of the inspiratory phase amplitude being greater than the second signal is: InspAmp(i)>Peak*Peak_Thr2, where InspAmp(i) is the inspiratory phase amplitude, Peak is the inspiratory phase peak value, and Peak_Thr2 is the second preset coefficient.

4. The method for detecting an airflow limitation event according to claim 1, wherein: The real-time acquisition of the inspiratory phase peak value and inspiratory phase time corresponding to each respiratory cycle includes: Acquire continuous respiratory signals in real time; performing bandpass filtering on the acquired respiratory signal to obtain a target respiratory signal; The target respiratory signal is detected to obtain the inspiratory phase time and inspiratory phase peak value corresponding to each respiratory cycle.

5. The method for detecting an airflow limitation event according to claim 1, wherein: The comparing the first duration with the first preset time specifically includes: Obtaining the first duration; Calculating each inspiratory phase time and a first preset threshold to obtain a first preset time; Compare the first duration to see whether it exceeds the first preset time.

6. The method for detecting an airflow limitation event according to claim 5, wherein: The comparison formula for comparing the first duration with the first preset time is: Time1>InspTime*Thr1, where Time1 is the first duration, InspTime is the inspiratory phase time, and Thr1 is the first preset threshold.

7. A device for detecting airflow limitation events, characterized in that: The airflow limitation event detection device specifically includes: An acquisition module is used to obtain the inspiratory phase peak and inspiratory phase time corresponding to each respiratory cycle in real time; a first statistics module, configured to obtain a first duration by counting, based on each respiratory cycle, a duration during which the corresponding inspiratory phase amplitude is greater than a first signal, wherein the first signal is a first amplitude signal obtained based on the inspiratory phase peak value, the first amplitude signal being obtained by multiplying the inspiratory phase peak value by a first preset coefficient, the first preset coefficient being less than 1, and the first signal being obtained by a user by presetting the first preset coefficient in the sleep monitor; a first comparing module, configured to compare the first duration with a first preset time, where the first preset time is the proportion of the inspiratory phase time when the inspiratory phase signal is in a normal state; a first determining module, configured to determine that the airflow is limited when the first duration exceeds a first preset time; Wherein, the airflow limitation event detection device further includes: a second determining module, configured to determine, when the first duration does not exceed the first preset time, whether the first duration exceeds a second preset time, the second preset time being shorter than the first preset time; a second statistical module, configured to, when the first duration does not exceed a second preset time, count the duration during which the inspiratory phase amplitude is greater than a second signal to obtain a second duration, where the second signal is a second amplitude signal obtained based on the inspiratory phase peak value, the second amplitude signal being obtained by multiplying the inspiratory phase peak value by a second preset coefficient, where the second preset coefficient is less than 1 and the first preset coefficient is greater than the second preset coefficient; a second comparing module, configured to compare the second duration with a first preset time; a third judgment module, configured to judge that the airflow is limited when the second duration reaches a first preset time; The fourth judgment module is configured to judge that the condition is not airflow limitation when the second duration does not reach a first preset time.

8. A sleep screening device, characterized in that: The sleep screening device specifically includes: a computer-readable storage medium for storing program instructions; and The program instructions are executed by the processor to implement the method for detecting an airflow limitation event according to any one of claims 1 to 6.

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