CN118044807A

CN118044807A - Blood oxygen saturation detection method, device, electronic equipment and storage medium

Info

Publication number: CN118044807A
Application number: CN202211436912.4A
Authority: CN
Inventors: 雷宇; 黄志斌; 刘秉昊
Original assignee: Territory Health Innovation Medical Technology Chengdu Co Ltd
Current assignee: Territory Health Innovation Medical Technology Chengdu Co Ltd
Priority date: 2022-11-16
Filing date: 2022-11-16
Publication date: 2024-05-17
Also published as: TWI827419B

Abstract

The application provides a blood oxygen saturation detection method, a device, an electronic device and a storage medium, wherein the method is applied to the electronic device, the electronic device comprises a plurality of channels for detecting blood oxygen saturation, and the blood oxygen saturation detection method comprises the following steps: acquiring a Photoplethysmogram (PGG) signal of each of a plurality of channels; determining a signal quality for each channel based on the PPG signal for each channel; screening PPG signals meeting preset signal quality standards from PPG signals of a plurality of channels based on the signal quality of each channel; and detecting the blood oxygen saturation according to the PPG signal meeting the preset signal quality standard. The application can avoid the conditions of unsuccessful blood oxygen saturation calculation or low accuracy caused by low signal quality of the channel.

Description

Blood oxygen saturation detection method, device, electronic equipment and storage medium

Technical Field

The present application relates to the field of medical devices, and in particular, to a blood oxygen saturation detection method, apparatus, electronic device, and computer readable storage medium.

Background

The blood oxygen saturation (Oxygen saturation, spO 2), which may be simply referred to as blood oxygen, refers to the percentage of the total amount of hemoglobin in the blood that is actually bound with oxygen.

Currently, blood oxygen measurement can be performed through multi-channel electronic equipment, such as multi-channel intelligent wearable equipment and the like. However, the signal measured by each channel has a difference, so that the success rate of measuring the blood oxygen saturation is not high, and the measurement accuracy is poor.

Disclosure of Invention

In view of the foregoing, the present application provides a method, apparatus, electronic device, and computer readable storage medium for detecting blood oxygen saturation, which can combine the signal quality collected by each channel to improve the success rate and accuracy of blood oxygen saturation measurement.

An embodiment of the present application provides a blood oxygen saturation detection method applied to an electronic device, where the electronic device includes a plurality of channels for detecting blood oxygen saturation, and the blood oxygen saturation detection method includes: acquiring a photoplethysmography (Photoplethysmography, PPG) signal for each of the plurality of channels, determining a signal quality for each of the channels based on the PPG signal for each of the channels; screening PPG signals meeting preset signal quality standards from the PPG signals of the channels based on the signal quality of each channel; and detecting the blood oxygen saturation according to the PPG signal meeting the preset signal quality standard.

According to the embodiment of the application, the signal quality of each channel is measured, and the blood oxygen saturation calculation is performed through the channel corresponding to the PPG signal meeting the signal quality standard, so that the condition that the blood oxygen saturation calculation is unsuccessful or the accuracy is low due to the low signal quality of the channel is avoided.

In some embodiments, each channel includes a detection light source comprising: a red light source and a green light source, each PPG signal comprising: red light data and green light data, said determining the signal quality of each channel based on said PPG signal of each channel, comprising: calculating correlation coefficients of red light data and green light data of the PPG signals in each channel; and determining the signal quality of each channel according to the correlation coefficient.

By adopting the technical scheme, the correlation coefficient is used as a basis for evaluating the signal quality, and the success rate and accuracy of measuring the blood oxygen saturation can be further improved.

In some embodiments, each channel further comprises a photoelectric conversion device, and the detection light source of each channel and the photoelectric conversion device are spaced differently.

According to the embodiment of the application, the detection light source and the photoelectric conversion device have different distances, so that PPG signals with different depths can be conveniently detected.

In some embodiments, filtering PPG signals meeting a preset signal quality criterion from PPG signals of the plurality of channels based on the signal quality of each channel includes:

And if the correlation coefficient corresponding to the current channel is in the preset correlation coefficient range, judging the PPG signal of the current channel as the PPG signal meeting the preset signal quality standard.

The correlation coefficient is in a preset range, and under the condition of ensuring the success rate of measuring the blood oxygen saturation, the accuracy of measuring the blood oxygen saturation can be ensured as much as possible.

In some embodiments, detecting blood oxygen saturation from the PPG signal meeting the preset signal quality criteria comprises:

Determining a target channel with the largest correlation coefficient in channels where the PPG signals meeting the preset signal quality standards are located; and detecting the blood oxygen saturation according to the PPG signal of the target channel.

The greater the correlation coefficient is, the higher the accuracy of the blood oxygen saturation is, so that the technical scheme can further improve the accuracy of measuring the blood oxygen saturation.

In some embodiments, the blood oxygen saturation detection method further comprises:

And if the PPG signal meeting the preset signal quality standard does not exist, re-acquiring the PPG signal of each channel until the PPG signal meeting the preset signal quality standard is acquired.

By adopting the technical scheme, when the PPG signals of all channels do not meet the preset signal standard, the PPG signals are acquired again for calculation, so that the success rate of blood oxygen saturation measurement is further improved.

In some embodiments, if there is no PPG signal that meets a preset signal quality criterion, re-acquiring the PPG signal of each channel until a PPG signal that meets the preset signal quality criterion is acquired, including:

If the preset blood oxygen saturation detection time is not exceeded and the PPG signal meeting the preset signal quality standard does not exist, acquiring the PPG signal of each channel again until the PPG signal meeting the preset signal quality standard is acquired;

and if the blood oxygen saturation detection time is exceeded and the PPG signal meeting the preset signal quality standard does not exist, outputting prompt information for indicating a user to adjust the position of the electronic equipment.

According to the technical scheme, the blood oxygen saturation detection time is set, if the blood oxygen saturation detection time is exceeded, a user is prompted to adjust the position of the electronic equipment, and the situation that the blood oxygen saturation cannot be detected due to the position of the electronic equipment is avoided.

An embodiment of the present application provides an apparatus for detecting blood oxygen saturation, which is applied to an electronic device, the electronic device including a plurality of channels for detecting blood oxygen saturation, the apparatus including:

An acquisition module for acquiring a photoplethysmogram PPG signal for each of the plurality of channels; a determining module, configured to determine a signal quality of each channel based on the PPG signal of each channel; a screening module, configured to screen PPG signals that meet a preset signal quality standard from PPG signals of the multiple channels based on the signal quality of each channel; and the detection module is used for detecting the blood oxygen saturation according to the PPG signal meeting the preset signal quality standard.

An embodiment of the present application provides an electronic device, where the electronic device includes a processor and a memory, the memory is configured to store instructions, and the processor is configured to invoke the instructions in the memory, so that the electronic device executes the method for detecting blood oxygen saturation.

An embodiment of the present application provides a computer-readable storage medium having stored thereon computer instructions that, when executed on an electronic device, cause the electronic device to perform the above-described blood oxygen saturation detection method.

The electronic device and the computer readable storage medium correspond to the blood oxygen saturation detection method, so that the advantages achieved by the method can be referred to the advantages of the corresponding method provided above, and the description thereof is omitted herein.

Drawings

Fig. 1 is a schematic diagram of the working principle of one channel of a PPG sensor in an embodiment of the present application.

FIG. 2 is a schematic diagram of a distance arrangement between a detection light source and a photoelectric conversion device according to an embodiment of the present application.

FIG. 3 is a flowchart illustrating steps for detecting blood oxygen saturation according to an embodiment of the present application.

FIG. 4 is a graph showing correlation coefficients of a channel and blood oxygen errors according to an embodiment of the present application.

Fig. 5 is a schematic block diagram of an apparatus for detecting blood oxygen saturation according to an embodiment of the application.

Fig. 6 is a schematic diagram of an electronic device according to an embodiment of the application.

Detailed Description

In order that the above-recited objects, features and advantages of the present application will be more clearly understood, a more particular description of the application will be rendered by reference to the appended drawings and appended detailed description. The embodiments of the present application and the features in the embodiments may be combined with each other without collision.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, and the described embodiments are merely some, rather than all, embodiments of the present application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

It is further intended that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

The term "at least one" in the present application means one or more, and "a plurality" means two or more. "and/or", describes an association relationship of an association object, and the representation may have three relationships, for example, a and/or B may represent: a alone, a and B together, and B alone, wherein a, B may be singular or plural. The terms "first," "second," "third," "fourth" and the like in the description and in the claims and drawings, if any, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order.

In embodiments of the application, words such as "exemplary" or "such as" are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "e.g." in an embodiment should not be taken as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present related concepts in a concrete fashion.

The application provides a blood oxygen saturation detection method, which is applied to electronic equipment, wherein the electronic equipment comprises a plurality of channels for detecting blood oxygen saturation, and the blood oxygen saturation detection method comprises the following steps:

acquiring a PPG signal for each of a plurality of channels;

determining a signal quality for each channel based on the PPG signal for each channel;

screening PPG signals meeting preset signal quality standards from PPG signals of a plurality of channels based on the signal quality of each channel;

And detecting the blood oxygen saturation according to the PPG signal meeting the preset signal quality standard.

The embodiment of the application measures the signal quality of each channel, calculates the blood oxygen saturation through the channel corresponding to the PPG signal meeting the signal quality standard, and avoids the condition of unsuccessful blood oxygen saturation calculation or low accuracy caused by low signal quality of the channel, namely, the embodiment of the application can improve the success rate and accuracy of measuring the blood oxygen saturation.

The blood oxygen saturation detection method can be applied to electronic equipment. The electronic device may be a device capable of automatically performing numerical calculation and/or information processing according to a preset or stored instruction, and its hardware includes, but is not limited to, a microprocessor, an Application SPECIFIC INTEGRATED Circuit (ASIC), a Programmable gate array (Field-Programmable GATE ARRAY, FPGA), a digital Processor (DIGITAL SIGNAL Processor, DSP), an embedded device, and the like. For example, the electronic device may be a wearable oximetry device, such as a computing device such as a sports bracelet, smart watch, finger ring, or the like. The electronic device can perform man-machine interaction with a user through a keyboard, a mouse, a remote controller, a touch pad or voice control equipment and the like.

The hardware of the electronic device may further comprise a PPG sensor on which the detection light source and a plurality of photo-sensor devices (pd) are arranged.

Each channel comprises: the photoelectric sensor and the detection light source are in one-to-one correspondence, and the photoelectric sensor and the detection light source can also share one detection light source, so that the embodiment of the application is not limited. A pd-acquired PPG signal is also understood to be a PPG signal acquired in the channel in which the pd is located.

In a PPG sensor of an electronic device, a detection light source in a channel is used for generating light with a preset wavelength, and irradiating the light with the preset wavelength to skin tissue of a user to be subjected to blood oxygen detection, a photoelectric conversion device which is in the same channel as the detection light source can be used for receiving light reflected back through the skin tissue to obtain a PPG signal, the PPG signal represents optical data of emitted light reflected back by the skin tissue, and the photoelectric conversion device can convert the reflected light into an electrical signal, so that the optical data can be represented in the form of the electrical signal.

The wavelength of the light generated by the detection light source can be set according to the reflection and absorption conditions of the skin tissue on the light with different wavelengths. For example, the light of the preset wavelength may include: one or more of red light, green light, and infrared light, but not limited thereto. The wavelength of red light may be 660nm, the wavelength of infrared light may be 904nm and the wavelength of green light may be 520nm.

The type of detection light source may be a light emitting Diode light source (LIGHT EMITTING Diode, LED), and the detection light source may include: one or more of red light led, green light led and infrared light led.

For example, referring to fig. 1, fig. 1 is a schematic diagram illustrating the working principle of one channel in the PPG sensor 101, the detection light source 1011 emits light with a preset wavelength to skin tissue at the finger, and the light transmitted through the skin tissue is reflected back, received by the photoelectric sensor 1012, and processed to obtain a PPG signal.

In some embodiments, different pitches may be provided between the detection light sources and the photoelectric conversion devices of different channels. The detection light sources and the photoelectric conversion devices of different channels of the embodiment have different distances, so that PPG signals with different depths can be detected conveniently.

For example, reference may be made to fig. 2, where fig. 2 is a schematic diagram of a pitch arrangement of a detection light source and a photoelectric conversion device, and fig. 2 shows two channels, namely a channel a and a channel b. The channel a includes: the photoelectric sensor 201 and the detection light source 202, the channel b includes the photoelectric sensor 203 and the detection light source 202, and the detection light source 202 includes 3 light sources, which can emit light of different wavelengths.

In the channel a, the distance between the photoelectric sensing device 201 and the detection light source 202 is d1, and the depth of the light reflected by the skin tissue to the photoelectric sensing device 201 is h1; in the channel b, the distance between the photoelectric sensing device 203 and the detection light source 202 is d2, the depth of the light reflected by the skin tissue to the photoelectric sensing device 203 is h2, and because d1 and d2 are different, h1 and h2 are different, so that subsequent detection of PPG signals with different depths is facilitated.

FIG. 3 is a flowchart illustrating steps for detecting blood oxygen saturation according to an embodiment of the present application. The order of the steps in the flow diagrams may be changed, and some steps may be omitted, according to different needs.

Referring to fig. 3, the method for detecting blood oxygen saturation may specifically include the following steps.

Step 301, obtaining a PPG signal for each of a plurality of channels.

After receiving the light reflected back through the skin tissue, the photoelectric sensing device of the electronic device may convert the optical signal into an electrical signal, filter and sample the electrical signal, and the PPG signal may be the filtered and sampled electrical signal. The detection light source comprises: under the conditions of red light led, green light led and infrared light led, sampling points of the PPG signals all comprise: red light data, green light data, and infrared light data.

During the filtering process, the electrical signal may be filtered through a high pass filter to remove low frequency interference and baseline, and filtered through a low pass filter to remove high frequency noise. For example, an infinite impulse response (infinite impulse response, IIR) high pass filter is used for filtering with a cut-off frequency of 0.5HZ, and then a finite length unit impulse response (Finite Impulse Response, FIR) low pass filter is used for filtering with a cut-off frequency of 5HZ.

In the sampling process, the signal sampling rate can be set according to actual requirements, so that enough data in the PPG can be conveniently used for carrying out subsequent signal quality evaluation and blood oxygen detection. For example, the sampling signal frequency may be set to 50HZ.

Step 302, determining the signal quality of each channel based on the PPG signal of each channel.

In some embodiments, if the PPG signal includes infrared light data, the infrared light data includes: the electronic device may calculate a Perfusion Index (PI) of each channel, and determine signal quality of each channel according to the PI value, where pi=infrared ac/infrared dc value is 100%, the greater the PI value, the stronger the signal quality of the channel, the smaller the PI value, which represents that the channel is susceptible to noise, and the PGG signal quality is poor.

However, in the case of determining the signal quality of the channel according to the PI value, if there is a slight continuous disturbance in the PPG signal, the PI value cannot accurately reflect the slight continuous disturbance in the PPG signal, so that the PPG signal of the channel may be misjudged as a valid PPG signal, that is, as a PPG signal meeting the preset signal quality standard; in the case of a low PI value but low interference, the PPG signal may be misjudged as an invalid PPG signal, i.e. as a PPG signal that does not meet the preset signal quality criterion, due to the low PI value.

That is, light reflected to the photoelectric conversion device is disturbed due to light interference in the channel, and thus deviation of the detection result of blood oxygen occurs, and the PI value cannot accurately reflect light interference occurring in the channel, so that signal quality of the channel is not accurately reflected by the PI value.

In view of this, in other embodiments, the detection light source may include: a red light source and a green light source, each PPG signal may include: red light data and green light data, step 302 may further include:

Calculating correlation coefficients of red light data and green light data of the PPG signals in each channel;

and determining the signal quality of each channel according to the correlation coefficient.

The correlation coefficient can reflect the degree of similarity of the red and green data in the PPG signal, the greater the degree of similarity, the greater the signal quality characterizing the channel.

Specifically, the calculation of the correlation coefficient may be performed by a red alternating current value in the red data and a green alternating current value in the green data.

Under the condition that the channel is interfered, the red light RD and the green light GR of the red light data are obviously disturbed, and the correlation coefficient of the channel is obviously reduced, so that the correlation coefficient of the red light data and the green light data can reflect the interference condition of the channel, the correlation coefficient is used as the basis of the signal quality of a reference channel, the actual strength of the signal quality of the channel can be more accurately reflected, and the accuracy of blood oxygen detection is further improved.

The process of calculating correlation coefficients for red and green data of the PPG signal in the channel is described below.

Obtaining a PPG signal obtained in a certain preset time period, wherein the PPG signal comprises sampling points 1, 2 and … …, M is the total number of sampling points included in the PPG signal, i comprises red light data rd _i and green light data gr _i, and a calculation formula of a correlation coefficient M is as follows:

step 303, filtering PPG signals meeting a preset signal quality standard from PPG signals of a plurality of channels based on the signal quality of each channel.

In some embodiments, if the correlation coefficient corresponding to the current channel is within a preset correlation coefficient range, the PPG signal of the current channel is determined to be a PPG signal that meets the preset signal quality standard.

The preset correlation coefficient range may be specifically larger than a certain preset correlation coefficient threshold, and the preset correlation coefficient threshold may take a natural number between 0.3 and 0.9.

Referring to fig. 4, fig. 4 shows the relationship between the correlation coefficient multi_coef and the blood oxygen error spo2_err of the channel in some experiments, and it can be seen that the larger the correlation coefficient is, the smaller the blood oxygen error is.

As shown in the following table 1, table 1 is a relationship between the correlation coefficient threshold value and the blood oxygen accuracy rate in a certain experiment, and the effective data rate is the ratio of the number of PPG signals meeting the preset signal quality standard to the number of total PPG signals N, and the calculation formula of the blood oxygen root mean square error spo2_ rmse is as follows:

TABLE 1

Correlation coefficient threshold	0	0.3	0.4	0.5	0.6	0.7	0.8	0.9
									SpO2_rmse	7.9	5.5	5.6	4.9	4.3	4.3	4.2	1.5
Effective data rate	100％	80％	76％	68％	65％	59％	42％	5％

From the above table, the larger the value of the correlation coefficient threshold is, the smaller the blood oxygen root mean square error is, namely the larger the blood oxygen accuracy is, the smaller the effective data rate is, and the effective data rate can reflect the success rate of blood oxygen calculation, so that the embodiment of the application sets the value range between 0.3 and 0.9, and can ensure the accuracy of blood oxygen saturation measurement as much as possible under the condition of ensuring the measurement success rate of blood oxygen saturation.

Step 304, detecting the blood oxygen saturation according to the PPG signal satisfying the preset signal quality standard.

In some embodiments, one PPG signal may be randomly selected from PPG signals meeting a preset signal quality criterion to detect blood oxygen saturation.

The absorption degree of the light generated by the detection light source by the skin tissue can be determined by the PPG signal, and the absorption degree can be converted into blood oxygen saturation.

In other embodiments, a target channel with the largest correlation coefficient is determined in channels where the PPG signal meeting the preset signal quality standard is located; blood oxygen saturation is detected from the PPG signal of the target channel.

For example, if the electronic device includes a channel a and a channel b, where the correlation coefficient of the channel a is Ma, the correlation coefficient of the channel b is Mb, the PGG signals of the channel a and the channel b are PPG signals that meet a preset signal quality standard, and Ma is greater than Mb, the channel a is a target channel, and the blood oxygen can be calculated by using the correlation coefficient obtained by the channel a.

The steps 301 to 304 are steps in which there is a PPG signal that meets the preset signal quality standard, and in practical situations, the PPG signal obtained by current sampling may not meet the preset signal quality standard, and in this case, step 201 may be re-entered, i.e. the PPG signal of each channel is re-acquired, until a PPG signal that meets the preset signal quality standard is acquired.

In this embodiment, when the PPG signals of each channel do not meet the preset signal quality standard, the PPG signal may be re-acquired for calculation, and compared with randomly selecting a PPG signal that does not meet the preset signal quality standard, the success rate and accuracy of blood oxygen saturation measurement can be improved in this embodiment.

However, if each channel cannot collect signals for a long time to meet the preset signal quality standard, the blood oxygen detection result will be too long, and the body feeling of the user will be affected.

The reason why the preset signal quality standard cannot be acquired for a long time may be due to the position of the electronic device, for example, the wearing state of the wearable device is abnormal, so in other embodiments, if the preset blood oxygen saturation detection time is not exceeded and the PPG signal meeting the preset signal quality standard does not exist, the PPG signal of each channel is acquired again until the PPG signal meeting the preset signal quality standard is acquired.

And if the blood oxygen saturation detection time is exceeded and the PPG signal meeting the preset signal quality standard does not exist, outputting prompt information for indicating a user to adjust the position of the electronic equipment. For example, the user is prompted to adjust the wearing state of the electronic device.

According to the embodiment, the blood oxygen saturation detection time is set, and when the blood oxygen saturation detection time is exceeded, the user is prompted to adjust the position of the electronic equipment, so that the situation that the blood oxygen saturation cannot be detected due to the position of the electronic equipment is avoided, and the user experience is improved.

Fig. 5 is a schematic block diagram of a blood oxygen saturation detecting device according to an embodiment of the present application.

Referring to fig. 5, the blood oxygen saturation detecting device can be applied to an electronic apparatus. The electronic device includes a plurality of channels for detecting blood oxygen saturation, and the blood oxygen saturation detection means may include one or more modules. For example, referring to fig. 5, the blood oxygen saturation detection apparatus may include an acquisition module 501, a determination module 502, a screening module 503, and a detection module 504.

The modules referred to in the embodiments of the present application may be a series of computer program instruction segments capable of completing specific functions, or may be functional modules formed by matching computer program instruction segments with hardware, where the modules are divided into a logic function division, and may have another division manner when actually implemented, which is not limited in the present application.

It will be appreciated that, corresponding to each of the embodiments of the blood oxygen saturation detection method described above, the blood oxygen saturation detection device may include some or all of the functional blocks shown in fig. 5, and the functions of each of the blocks 501 to 504 will be described in detail below. The same noun related terms and their specific explanations as in the embodiments of the method for detecting blood oxygen saturation described above may also be applied to the following functional descriptions of the modules 501 to 504. For the sake of space saving and repetition avoidance, the description is omitted.

An acquisition module 501, configured to acquire a PPG signal of each channel of the plurality of channels;

A determining module 502, configured to determine a signal quality of each channel based on the PPG signal of each channel;

A screening module 503, configured to screen PPG signals meeting a preset signal quality standard from PPG signals of the multiple channels based on the signal quality of each channel;

The detection module 504 is configured to detect the blood oxygen saturation according to the PPG signal that meets the preset signal quality standard.

In some embodiments, each channel includes a detection light source comprising: a red light source and a green light source, each PPG signal comprising: the determining module 502 determines the signal quality of each channel based on the PPG signal of each channel, including: calculating correlation coefficients of red light data and green light data of the PPG signals in each channel; and determining the signal quality of each channel according to the correlation coefficient.

In some embodiments, the filtering module 503 filters, based on the signal quality of each channel, PPG signals that meet a preset signal quality standard from PPG signals of the multiple channels, including:

In some embodiments, detecting the blood oxygen saturation according to the PPG signal satisfying the preset signal quality criterion in the detecting module 504 includes:

In some embodiments, if there is no PPG signal that meets the preset signal quality standard in the filtering module 503, the PPG signal of each channel is re-acquired until a PPG signal that meets the preset signal quality standard is acquired.

In some embodiments, if there is no PPG signal that meets the preset signal quality standard in the filtering module 503, re-acquiring the PPG signal of each channel until a PPG signal that meets the preset signal quality standard is acquired, including: if the preset blood oxygen saturation detection time is not exceeded and the PPG signal meeting the preset signal quality standard does not exist, acquiring the PPG signal of each channel again until the PPG signal meeting the preset signal quality standard is acquired; and if the blood oxygen saturation detection time is exceeded and the PPG signal meeting the preset signal quality standard does not exist, outputting prompt information for indicating a user to adjust the position of the electronic equipment.

Fig. 6 is a schematic diagram of an embodiment of an electronic device according to the present application.

The electronic device 200 comprises a memory 20, a processor 30 and a computer program 40 stored in the memory 20 and executable on the processor 30. The steps of the embodiments of the blood oxygen saturation detection method described above, such as steps 301-304 shown in fig. 3, may be implemented by the processor 30 when executing the computer program 40.

By way of example, the computer program 40 may likewise be partitioned into one or more modules/units that are stored in the memory 20 and executed by the processor 30. The one or more modules/units may be a series of computer program instruction segments capable of performing particular functions for describing the execution of the computer program 40 in the electronic device 200. For example, the acquisition module 501, the determination module 502, the screening module 503, and the detection module 504 shown in fig. 5 may be divided.

The electronic device 200 may be a computing device such as a desktop computer, notebook computer, palm top computer, industrial computer, tablet computer, server, etc. It will be appreciated by those skilled in the art that the schematic diagram is merely an example of the electronic device 200 and is not meant to be limiting of the electronic device 200, and may include more or fewer components than shown, or may combine certain components, or different components, e.g., the electronic device 200 may also include input-output devices, network access devices, buses, etc.

The Processor 30 may be a central processing unit (Central Processing Unit, CPU), but may also be other general purpose processors, digital signal processors (DIGITAL SIGNAL Processor, DSP), application SPECIFIC INTEGRATED Circuit (ASIC), off-the-shelf Programmable gate array (Field-Programmable GATE ARRAY, FPGA) or other Programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. The general purpose processor may be a microprocessor, a single-chip microcomputer or the processor 30 may be any conventional processor or the like.

The memory 20 may be used to store computer programs 40 and/or modules/units, and the processor 30 implements various functions of the electronic device 200 by running or executing the computer programs and/or modules/units stored in the memory 20, as well as invoking data stored in the memory 20. The memory 20 may mainly include a storage program area that may store an operating system, application programs required for at least one function (such as a sound playing function, an image playing function, etc.), and a storage data area; the storage data area may store data (such as audio data) created according to the use of the electronic device 200, and the like. In addition, the memory 20 may include high-speed random access memory, and may also include non-volatile memory, such as a hard disk, memory, plug-in hard disk, smart memory card (SMART MEDIA CARD, SMC), secure Digital (SD) card, flash memory card (FLASH CARD), at least one magnetic disk storage device, flash memory device, or other non-volatile solid-state storage device.

The integrated modules/units of the electronic device 200 may be stored in a computer readable storage medium if implemented in the form of software functional units and sold or used as a stand alone product. Based on such understanding, the present application may implement all or part of the flow of the method of the above embodiment, or may be implemented by a computer program to instruct related hardware, where the computer program may be stored in a computer readable storage medium, where the computer program, when executed by a processor, may implement the steps of each of the method embodiments described above. Wherein the computer program comprises computer program code which may be in source code form, object code form, executable file or some intermediate form etc. The computer readable medium may include: any entity or device capable of carrying the computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer Memory, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), an electrical carrier signal, a telecommunications signal, a software distribution medium, and so forth. It should be noted that the computer readable medium contains content that can be appropriately scaled according to the requirements of jurisdictions in which such content is subject to legislation and patent practice, such as in certain jurisdictions in which such content is subject to legislation and patent practice, the computer readable medium does not include electrical carrier signals and telecommunication signals.

In the several embodiments provided in the present application, it should be understood that the disclosed electronic device and method may be implemented in other manners. For example, the above-described embodiments of the electronic device are merely illustrative, and for example, the division of the units is merely a logical function division, and there may be other manners of division when actually implemented.

In addition, each functional unit in the embodiments of the present application may be integrated in the same processing unit, or each unit may exist alone physically, or two or more units may be integrated in the same unit. The integrated units can be realized in a form of hardware or a form of hardware and a form of software functional modules.

Finally, it should be noted that the above-mentioned embodiments are merely for illustrating the technical solution of the present application and not for limiting the same, and that it should be understood by those skilled in the art that the technical solution of the present application may be modified or substituted without departing from the spirit and scope of the technical solution of the present application.

Claims

1. A blood oxygen saturation detection method, characterized by being applied to an electronic device including a plurality of channels for detecting blood oxygen saturation, the blood oxygen saturation detection method comprising:

Acquiring a photoplethysmogram (PPG) signal of each channel in the plurality of channels;

Screening PPG signals meeting preset signal quality standards from the PPG signals of the channels based on the signal quality of each channel;

2. The method of claim 1, wherein each channel comprises a detection light source comprising: a red light source and a green light source, each PPG signal comprising: red light data and green light data, said determining the signal quality of each channel based on said PPG signal of each channel, comprising:

3. The method for detecting blood oxygen saturation according to claim 2, wherein each of the channels further includes a photoelectric conversion device, and a detection light source of each of the channels and the photoelectric conversion device are different in pitch.

4. The method for detecting blood oxygen saturation according to claim 2, wherein the screening PPG signals satisfying a preset signal quality criterion from PPG signals of the plurality of channels based on the signal quality of each channel includes:

5. The method of claim 4, wherein detecting blood oxygen saturation from a PPG signal meeting the preset signal quality criteria comprises:

Determining a target channel with the largest correlation coefficient in channels where the PPG signals meeting the preset signal quality standards are located;

and detecting the blood oxygen saturation according to the PPG signal of the target channel.

6. The blood oxygen saturation detection method according to any one of claims 1 to 5, characterized in that the blood oxygen saturation detection method further comprises:

7. The method according to claim 6, wherein if there is no PPG signal satisfying a preset signal quality criterion, re-acquiring the PPG signal of each channel until a PPG signal satisfying the preset signal quality criterion is acquired, comprising:

8. An oxygen saturation detection apparatus, characterized by being applied to an electronic device including a plurality of channels for detecting oxygen saturation, the oxygen saturation detection apparatus comprising:

An acquisition module for acquiring a photoplethysmogram PPG signal for each of the plurality of channels;

A determining module, configured to determine a signal quality of each channel based on the PPG signal of each channel;

A screening module, configured to screen PPG signals that meet a preset signal quality standard from PPG signals of the multiple channels based on the signal quality of each channel;

and the detection module is used for detecting the blood oxygen saturation according to the PPG signal meeting the preset signal quality standard.

9. An electronic device comprising a processor and a memory for storing instructions, wherein the processor is configured to invoke the instructions in the memory, such that the electronic device performs the blood oxygen saturation detection method of any one of claims 1 to 7.

10. A computer readable storage medium having stored thereon computer instructions, which when run on an electronic device, cause the electronic device to perform the blood oxygen saturation detection method according to any one of claims 1 to 7.