Blood oxygen monitoring method, device and equipment and computer readable storage medium

Abstract

The invention discloses a blood oxygen monitoring method, device and equipment and a computer readable storage medium, is applied to the technical field of blood oxygen monitoring, aims to solve the problem that existing blood oxygen monitoring is low in accuracy, and provides the method applied to the blood oxygen monitoring equipment, and comprises the steps that under the condition that it is detected that a finger is inserted into the blood oxygen monitoring equipment, a blood oxygen signal is collected; determining a signal-to-noise ratio of the pulsation part signal according to the blood oxygen signal; under the condition that the signal-to-noise ratio of the pulsation part signal is lower than a first preset signal-to-noise ratio threshold value, the driving current of a light source located in the blood oxygen monitoring equipment is controlled to be increased; the driving current of the light source is directly adjusted based on the signal-to-noise ratio of the pulsation part signal, so that the signal-to-noise ratio of the pulsation part signal is improved, the adjusting effect is good, the measurement error can be effectively reduced, and the calculation accuracy of the final blood oxygen saturation degree can be improved.

Description

Technical Field

[0001] The present invention relates to the field of blood oxygen monitoring technology, and in particular to a blood oxygen monitoring method, device, equipment and computer-readable storage medium. Background Art

[0002] Blood oxygen saturation monitoring is one of the important indicators for evaluating human health, especially in the fields of medical monitoring, sports health, etc. The measurement principle of blood oxygen is generally based on the Lambert-Beer law, detecting the different absorption of red light and infrared light by human tissue, and separating the pulsating AC (Alternating Current) part and the non-pulsating DC (Direct Current) part, and the DC part accounts for the vast majority, and then further derives the final blood oxygen saturation value based on the two parts of data. In the case of low perfusion, because the AC part is mixed with a lot of ambient light noise and inherent circuit background noise, the signal-to-noise ratio of the AC part is very poor, and it is difficult to separate the effective AC component, which causes a large error in the measurement result or even makes it impossible to measure.

[0003] Currently, the light intensity of the light source is usually adjusted based on the detected photoelectric sensor current or the baseline of the PPG (Photoplethysmography) signal. When the current is too small or the baseline is too low, the light intensity is increased, and vice versa. However, since most of the current or signal in the photoelectric sensor current or PPG signal belongs to the DC part, the amplitude of the DC part cannot represent the signal quality of the AC part. Therefore, this adjustment method has poor adjustment effect, cannot effectively reduce the measurement error, and affects the calculation accuracy of the final blood oxygen saturation.

[0004] In view of this, how to effectively reduce the measurement error of the blood oxygen detection equipment and improve the calculation accuracy of the final blood oxygen saturation has become a problem that technical personnel in this field need to solve. Summary of the invention

[0005] The purpose of the embodiments of the present invention is to provide a blood oxygen monitoring method, device, equipment and computer-readable storage medium, which can effectively reduce the measurement error of the blood oxygen detection equipment during use, which is conducive to improving the calculation accuracy of the final blood oxygen saturation.

[0006] To solve the above technical problems, the embodiments of the present invention provide the following technical solutions:

[0007] In one aspect, the present invention provides a blood oxygen monitoring method, which is applied to a blood oxygen monitoring device, comprising:

[0008] When a finger is detected to be inserted into the blood oxygen monitoring device, the blood oxygen signal is collected;

[0009] Determine the signal-to-noise ratio of the pulsation signal according to the blood oxygen signal;

[0010] When the signal-to-noise ratio of the pulsating portion signal is lower than a first preset signal-to-noise ratio threshold, the driving current of the light source in the blood oxygen monitoring device is controlled to increase.

[0011] In one embodiment, determining the signal-to-noise ratio of the pulsating portion signal according to the blood oxygen signal comprises:

[0012] The non-pulsating signal is filtered out from the blood oxygen signal by a high-pass filter to obtain a pulsating signal;

[0013] Separating effective signals and noise signals from the pulsating portion signal;

[0014] Determine the effective signal average power according to the effective signal;

[0015] Determine the average power of the noise signal according to the noise signal;

[0016] The signal-to-noise ratio of the pulsating signal is determined according to the effective signal average power and the noise signal average power.

[0017] In one embodiment, the step of controlling the driving current of a light source in the blood oxygen monitoring device to increase includes:

[0018] The driving current of the light source in the blood oxygen monitoring device is controlled to increase based on a preset current step size.

[0019] In one embodiment, after the driving current of the light source in the blood oxygen monitoring device is increased by controlling the preset current step length, the method further includes:

[0020] Determine the signal-to-noise ratio of the new beating part signal according to the blood oxygen signal collected after the driving current is increased;

[0021] Determine whether the signal-to-noise ratio of the new beating part signal is greater than or equal to the first preset signal-to-noise ratio threshold, and whether the transmitted light intensity of the light source after increasing the driving current is less than or equal to the first preset light intensity threshold;

[0022] In the case where the signal-to-noise ratio of the new beating portion signal is less than the first preset signal-to-noise ratio threshold, and the transmitted light intensity of the light source is less than or equal to the first preset light intensity threshold, returning to the step of increasing the driving current of the light source in the blood oxygen monitoring device based on the preset current step length until the signal-to-noise ratio of the new beating portion signal is greater than or equal to the first preset signal-to-noise ratio threshold, and the transmitted light intensity of the light source is less than or equal to the first preset light intensity threshold, and the final driving current is used as the measurement current of the light source;

[0023] When the signal-to-noise ratio of the new beating part signal is greater than or equal to the first preset signal-to-noise ratio threshold, and the transmitted light intensity of the light source after the driving current is increased is less than or equal to the first preset light intensity threshold, the current driving current is used as the measurement current of the light source;

[0024] When the signal-to-noise ratio of the new beating part signal is less than the first preset signal-to-noise ratio threshold, and the transmitted light intensity of the light source is greater than the first preset light intensity threshold after the driving current is increased, the current driving current is used as the measurement current of the light source.

[0025] In one embodiment, it further includes:

[0026] When the signal-to-noise ratio of the pulsating portion signal is greater than a second preset signal-to-noise ratio threshold, and the transmitted light intensity of the light source is greater than or equal to a second preset light intensity threshold, the driving current of the light source is controlled to decrease based on the preset current step; wherein the second preset signal-to-noise ratio threshold is greater than the first preset signal-to-noise ratio threshold, and the second preset light intensity threshold is less than the first preset light intensity threshold;

[0027] Determine the signal-to-noise ratio of the new beating part signal according to the blood oxygen signal collected after the driving current is reduced;

[0028] In the case where the signal-to-noise ratio of the new beating portion signal is greater than the second preset signal-to-noise ratio threshold, and the transmitted light intensity of the light source after reducing the driving current is greater than or equal to the second preset light intensity threshold, returning to the step of controlling the driving current of the light source to reduce based on the preset current step, until the signal-to-noise ratio of the new beating portion signal is less than or equal to the second preset signal-to-noise ratio threshold, and the transmitted light intensity of the light source is greater than or equal to the second preset light intensity threshold, and the final driving current is used as the measurement current of the light source;

[0029] When the signal-to-noise ratio of the new beating part signal is greater than the second preset signal-to-noise ratio threshold, and the transmitted light intensity of the light source after reducing the driving current is less than the second preset light intensity threshold, the current driving current is used as the measurement current of the light source.

[0030] In one embodiment, it further includes:

[0031] The preset current step length is adjusted according to the preset current step length adjustment information input by the user.

[0032] In one embodiment, when a finger is detected to be inserted into the blood oxygen monitoring device, before collecting the blood oxygen signal, the method further includes:

[0033] When a probe is detected to be inserted into the blood oxygen monitoring device, the light source is controlled to enter a low power consumption working mode;

[0034] When a finger is detected to be inserted into the blood oxygen monitoring device, collecting the blood oxygen signal includes:

[0035] When it is detected that a finger is inserted into the blood oxygen monitoring device, the driving current of the light source is controlled to be a default working current, and a blood oxygen signal is collected.

[0036] Another aspect of the present invention provides a blood oxygen monitoring device, which is applied to a blood oxygen monitoring device, comprising:

[0037] A collection module, used to collect blood oxygen signals when a finger is detected to be inserted into the blood oxygen monitoring device;

[0038] A calculation module, used for determining a signal-to-noise ratio of a pulsating signal according to the blood oxygen signal;

[0039] The first control module is used to control the driving current of the light source in the blood oxygen monitoring device to increase when the signal-to-noise ratio of the pulsating part signal is lower than a first preset signal-to-noise ratio threshold.

[0040] Another aspect of the present invention provides a blood oxygen monitoring device, comprising: a light source, a photoelectric sensor, a processor and a driver; wherein:

[0041] The processor is used to control the photoelectric sensor to collect the blood oxygen signal when a finger is detected to be inserted into the blood oxygen monitoring device, and determine the signal-to-noise ratio of the pulsating part signal according to the blood oxygen signal, and control the driving current of the light source to increase through the driver when the signal-to-noise ratio of the pulsating part signal is lower than a first preset signal-to-noise ratio threshold.

[0042] Another aspect of the present invention provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the blood oxygen monitoring method as described above are implemented.

[0043] It can be seen from the above technical solutions that the embodiments of the present invention have the following advantages:

[0044] In an embodiment of the present invention, a blood oxygen monitoring method is provided, which is applied to a blood oxygen monitoring device. When a finger is detected to be inserted into the blood oxygen monitoring device, it indicates that a user is using the blood oxygen detection device. At this time, blood oxygen data can be collected, and the signal-to-noise ratio of the pulsating part signal is determined according to the pulsating part signal in the blood oxygen data, and when the signal-to-noise ratio of the pulsating part signal is lower than a first preset signal-to-noise ratio threshold, the driving current of the light source is increased and adjusted. In this application, the signal-to-noise ratio of the pulsating part signal in the blood oxygen data is directly judged. When the signal-to-noise ratio of the pulsating part signal is low, it indicates that the signal-to-noise ratio is poor at this time. The driving current of the light source is increased, thereby improving the signal-to-noise ratio of the pulsating part signal. The adjustment effect is good, and the measurement error can be effectively reduced, which is beneficial to improving the calculation accuracy of the final blood oxygen saturation.

[0045] In addition, the present invention also provides corresponding implementation devices, electronic devices and computer-readable storage media for the blood oxygen monitoring method, which further makes the method more practical, and the devices, electronic devices and computer-readable storage media have corresponding advantages. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the prior art and the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0047] Figure 1 A schematic diagram of a blood oxygen monitoring method provided by an embodiment of the present invention;

[0048] Figure 2 Schematic diagram of AC signal and DC signal in blood oxygen signal;

[0049] Figure 3 This is a circuit diagram of a blood oxygen monitoring device;

[0050] Figure 4 An effective signal and a noise signal after AC part separation provided by an embodiment of the present invention;

[0051] Figure 5 A schematic diagram of a flow chart of another blood oxygen monitoring method provided by an embodiment of the present invention;

[0052] Figure 6 A schematic diagram of a flow chart of another blood oxygen monitoring method provided by an embodiment of the present invention;

[0053] Figure 7 A structural diagram of a blood oxygen monitoring device provided by the present invention;

[0054] Figure 8 A structural diagram of a blood oxygen monitoring device provided by the present invention. DETAILED DESCRIPTION

[0055] The embodiments of the present invention provide a blood oxygen monitoring method, apparatus, device and computer-readable storage medium, which can effectively reduce the measurement error of the blood oxygen detection equipment during use, and are conducive to improving the calculation accuracy of the final blood oxygen saturation.

[0056] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0057] It should be noted that blood oxygen saturation monitoring is one of the important indicators for assessing human health, especially in the fields of medical monitoring, sports health, etc. The principle of blood oxygen measurement is to detect the signals of different absorption of red light and infrared light by human tissue, and separate the pulsating AC part and the non-pulsating DC part, and the DC part accounts for the majority, and then calculate the result according to the formula SpO2% = A + B*R, and calibrate the calculation result to get the final blood oxygen saturation value.

[0058] Formula SpO2% = A + B*R , among which, AC red and DC red Represents the AC and DC parts of red light respectively, AC IR and DC IR They represent the AC and DC parts of direct infrared light respectively, while A and B are obtained by calibration.

[0059] In the case of low perfusion, since the AC part is mixed with a lot of ambient light noise and inherent circuit background noise, the signal-to-noise ratio of the AC part is very poor, and it is difficult to separate the effective AC component, which causes a large error in the measurement result or even makes it impossible to measure. Currently, the measurement error is reduced by adjusting the light source. Specifically, according to the baseline of the detected photosensor current or PPG signal, the light intensity can be increased when the current is too small or the baseline is too low, and vice versa. This can improve the measurement error in the case of low perfusion to a certain extent. However, most of the current or signal in the photosensor current or PPG signal belongs to the DC part, and the amplitude of the DC part cannot represent the signal quality of the AC part. For example, a finger with a whiter skin and a thinner skin will definitely have a larger photosensor current and PPG signal, but the signal quality of its AC part cannot be determined. If the signal-to-noise ratio is poor, it will directly affect the calculation accuracy of the final blood oxygen saturation. In view of this, a blood oxygen monitoring method is provided in an embodiment of the present invention, please refer to Figure 1 , Figure 1 A flow chart of a blood oxygen monitoring method provided by an embodiment of the present invention. The blood oxygen monitoring method is applied to a blood oxygen monitoring device, and the method includes:

[0060] S110: When a finger is detected to be inserted into the blood oxygen monitoring device, a blood oxygen signal is collected;

[0061] It should be noted that when a user uses a blood oxygen monitoring device and inserts a finger into the corresponding position of the blood oxygen monitoring device, when the blood oxygen monitoring device detects that the user's finger has been inserted, the photoelectric sensor can be used to collect sensing data, and a corresponding blood oxygen signal can be obtained based on the sensing data. The blood oxygen signal includes a pulsating signal (i.e., an AC signal, which is an alternating current signal converted after light passes through the skin tissue and is received by the photoelectric sensor) and a non-pulsating signal (i.e., a DC signal, which is a direct current signal converted after light passes through the skin tissue and is received by the photoelectric sensor). Figure 2 shown.

[0062] In practical applications, the light transmittance of a finger can be detected by a photoelectric sensor, e.g. Figure 3 The circuit structure diagram of the blood oxygen monitoring device shown in the figure, the finger position is as follows Figure 3 As shown in , a light source (such as an LED light source) emits red light and infrared light alternately above the finger, and a photoelectric sensor detects the light intensity passing through the finger below the finger and converts the light intensity into current. The stronger the light, the greater the current. As the AC signal fluctuates, the light intensity passing through the finger also fluctuates, and the induced current on the photoelectric sensor also fluctuates accordingly, so that the transmittance can be obtained based on the induced current and further the blood oxygen signal can be obtained.

[0063] S120: determining a signal-to-noise ratio of a pulsation signal according to the blood oxygen signal;

[0064] It is understandable that in the embodiment of the present invention, the AC signal can be directly determined from the blood oxygen signal, and the signal-to-noise ratio of the AC signal can be calculated based on the AC signal.

[0065] Specifically, the non-pulsating part signal can be filtered out from the blood oxygen signal by a high-pass filter to obtain the pulsating part signal; the effective signal and the noise signal can be separated from the pulsating part signal; the average power of the effective signal can be determined according to the effective signal; the average power of the noise signal can be determined according to the noise signal; and the signal-to-noise ratio of the pulsating part signal can be determined according to the average power of the effective signal and the average power of the noise signal.

[0066] That is, in practical applications, the non-pulsating signal (i.e., DC signal) in the blood oxygen signal can be filtered out by a high-pass filter to obtain an AC signal. Then, the AC signal collected in each cycle can be separated by the dmey wavelet decomposition method to obtain a high-frequency noise signal (such as Figure 4 d1 shown in the figure) and the low-frequency effective signal signal (such as Figure 4 The a1 part shown in the figure is the low-frequency pulse signal), and the average power P of the noise signal is obtained according to each noise signal noise in the current cycle. noise , according to each valid signal signal in the current cycle, the effective signal average power P is obtained signal For example, if the acquisition cycle is N times per second, then based on the noise data noise[n] sampled each second and the valid data signal[n] sampled each second, the average power of the noise signal per second can be obtained as:

[0067] ;

[0068] The effective signal average power per second is:

[0069] .

[0070] Specifically, the noise data and valid data decomposed in each cycle can be stored in corresponding buffers of length N, for example, noise[0], noise[1], ..., noise[N-1] of length N for the noise signal in the buffer are stored in a buffer of length N, and P is calculated based on this group of data. noise When new data arrives, the oldest data will be removed and recalculated. , when noise[N] arrives, noise[0] is removed and recalculated , when noise[N+1] arrives, noise[1] is removed and recalculated For valid data, signal[0], signal[1], ..., signal[N-1] of length N are also stored in another buffer of length N, and the calculation is based on this group of data. When new data arrives, the oldest data will be removed and recalculated. , when signal [N] arrives, signal [0] is removed and recalculated , when signal [N+1] arrives, signal [1] is removed and recalculated Since the effective signal and the noise signal are synchronized, it can be obtained in each calculation and After that, you can / Get the current signal-to-noise ratio.

[0071] S130: When the signal-to-noise ratio of the pulsating portion signal is lower than a first preset signal-to-noise ratio threshold, control the driving current of the light source in the blood oxygen monitoring device to increase.

[0072] It should be noted that after obtaining the signal-to-noise ratio of the pulsating part signal, it can be further determined whether the signal-to-noise ratio of the pulsating part signal is lower than a first preset signal-to-noise ratio threshold (the first preset signal-to-noise ratio threshold may be a minimum signal-to-noise ratio threshold), wherein the first preset signal-to-noise ratio threshold may be set according to an empirical value, that is, if the signal-to-noise ratio is less than the first preset signal-to-noise ratio, it means that the signal-to-noise ratio of the AC signal is poor. At this time, it is necessary to increase the current of the light source, thereby improving the signal-to-noise ratio of the AC signal, which is beneficial to improving the accuracy of the calculation result.

[0073] It can be seen that in the embodiment of the present invention, when it is detected that a finger is inserted into the blood oxygen monitoring device, it means that a user is using the blood oxygen detection device. At this time, blood oxygen data can be collected, and the signal-to-noise ratio of the pulsating part signal can be determined according to the pulsating part signal in the blood oxygen data, and when the signal-to-noise ratio of the pulsating part signal is lower than the first preset signal-to-noise ratio threshold, the driving current of the light source is increased and adjusted. In this application, the signal-to-noise ratio of the pulsating part signal in the blood oxygen data is directly judged. When the signal-to-noise ratio of the pulsating part signal is low, it means that the signal-to-noise ratio is poor at this time. The driving current of the light source is increased, thereby improving the signal-to-noise ratio of the pulsating part signal. After adjustment, the measurement error can be effectively reduced, which is beneficial to improving the calculation accuracy of the final blood oxygen saturation.

[0074] The following is a further explanation and introduction of the technical solution. Please refer to Figure 5 and Figure 6 , the method comprising:

[0075] S210: When it is detected that a probe is inserted into the blood oxygen monitoring device, control the light source to enter a low power consumption working mode;

[0076] It should be noted that for blood oxygen monitoring devices that need to be connected to monitors and other devices, the work can be realized by inserting the probe into the monitors and other devices. The device can determine whether there is a probe inserted by detecting the impedance of the loop. When it is detected that the probe is inserted into the monitor and other devices, the light source can be controlled to enter a low-power working mode (that is, the driving current of the light source is set to a preset low-power current). At this time, the LED light source loop is automatically formed, and the photoelectric sensor loop is also automatically formed.

[0077] S220: When a finger is detected to be inserted into the blood oxygen monitoring device, the driving current of the light source is controlled to be a default working current, and a blood oxygen signal is collected;

[0078] It is understandable that when the LED light source is in low-power working mode, it can detect whether a finger is inserted into the probe. When the LED light source injects low-power current, the magnitude of the induced current of the photoelectric sensor can be used to determine whether a finger is inserted. If the induced current is greater than the detection threshold, it is considered that no finger is inserted at this time. If the induced current is less than or equal to the detection threshold, it is considered that a finger is inserted. Specifically, when a finger is detected to be inserted, the driving current of the LED light source is changed from the low-power current to the default measurement current, and the induced data is collected by the photoelectric sensor, and the corresponding blood oxygen signal is obtained based on the induced data.

[0079] S230: determining a signal-to-noise ratio of the pulsation signal according to the blood oxygen signal;

[0080] Specifically, step S230 in the embodiment of the present invention is the same as step S120 in the above embodiment. For a specific description, reference may be made to step S120, and the embodiment of the present invention will not be repeated here.

[0081] S240: When the signal-to-noise ratio of the pulsating portion signal is lower than a first preset signal-to-noise ratio threshold, controlling the driving current of the light source in the blood oxygen monitoring device to increase based on a preset current step length;

[0082] In actual applications, a preset current step can be set in advance. When adjusting the driving current of the light source in the blood oxygen monitoring device, the driving current of the light source in the blood oxygen monitoring device can be increased according to the preset current step (for example, 5mA). That is, the preset current step is increased on the basis of the current driving current to obtain a new driving current to drive the light source.

[0083] S250: determining a signal-to-noise ratio of a new beating signal according to the blood oxygen signal collected after the driving current is increased;

[0084] It is understandable that after the driving current is increased, the blood oxygen signal can be collected again, and the signal-to-noise ratio of the corresponding new beating part signal can be obtained again based on the blood oxygen signal.

[0085] S260: Determine whether the signal-to-noise ratio of the new beating part signal is greater than or equal to a first preset signal-to-noise ratio threshold, and whether the transmitted light intensity of the light source after the driving current is increased is less than or equal to a first preset light intensity threshold;

[0086] It should be noted that, in the embodiment of the present invention, each time the driving current is increased, it can be determined whether the signal-to-noise ratio of the new beating part signal is greater than or equal to the first preset signal-to-noise ratio threshold, and whether the transmitted light intensity of the LED light source is less than or equal to the first preset light intensity threshold (the first preset light intensity threshold can be the maximum safety limit threshold). By comparing with the first preset light intensity threshold, it can be determined whether the light source intensity of the adjusted light source is within a safe range.

[0087] S270: When the signal-to-noise ratio of the new beating part signal is less than the first preset signal-to-noise ratio threshold, and the transmitted light intensity of the light source is less than or equal to the first preset light intensity threshold, return to the step of increasing the driving current of the light source located in the blood oxygen monitoring device based on the preset current step size control, until the signal-to-noise ratio of the new beating part signal is greater than or equal to the first preset signal-to-noise ratio threshold, and the transmitted light intensity of the light source is less than or equal to the first preset light intensity threshold, and the final driving current is used as the measurement current of the light source.

[0088] S280: When the signal-to-noise ratio of the new beating part signal is greater than or equal to the first preset signal-to-noise ratio threshold, and the transmitted light intensity of the light source after the driving current is increased is less than or equal to the first preset light intensity threshold, use the current driving current as the measurement current of the light source;

[0089] S290: When the signal-to-noise ratio of the new beating part signal is less than the first preset signal-to-noise ratio threshold, and the transmitted light intensity of the light source after the driving current is increased is greater than the first preset light intensity threshold, the current driving current is used as the measurement current of the light source.

[0090] Specifically, if the signal-to-noise ratio of the new beating part signal is less than the first preset signal-to-noise ratio threshold, it means that the light intensity emitted by the LED light source is not sufficient to increase the signal-to-noise ratio of the AC signal to a level sufficient for accurately calculating the blood oxygen saturation result. However, in order to ensure the safety of the use of the LED light source, it is necessary to cyclically increase the driving current of the light source according to the preset current step only when the transmitted light intensity of the light source is not much greater than the first preset light intensity threshold. After reaching the first preset light intensity threshold, the current can only be increased by a maximum of one step, and after each increase in the driving current by a preset current step, it is determined whether the signal-to-noise ratio of the new beating part signal is Whether the signal-to-noise ratio of the AC signal is greater than or equal to the first preset signal-to-noise ratio threshold, and whether the transmitted light intensity of the light source is less than or equal to the first preset light intensity threshold after the driving current is increased; when the signal-to-noise ratio of the new beating part signal is greater than or equal to the first preset signal-to-noise ratio threshold, and the transmitted light intensity of the light source is less than or equal to the first preset light intensity threshold, it means that the signal-to-noise ratio of the AC signal is increased to be sufficient for accurately calculating the blood oxygen saturation result. At this time, the final driving current can be used as the measurement current of the light source, and the blood oxygen data is collected under the measurement current to calculate the final blood oxygen saturation, thereby ensuring that the signal-to-noise ratio of the obtained AC signal is high, which is beneficial to improving the accuracy of the calculation result.

[0091] If the signal-to-noise ratio of the new beating part signal is greater than or equal to the first preset signal-to-noise ratio threshold, and the transmitted light intensity of the light source after the driving current is increased is less than or equal to the first preset light intensity threshold, it means that the signal-to-noise ratio of the AC signal is increased to be sufficient for accurately calculating the blood oxygen saturation result, and the current driving current can be used as the measurement current of the light source; if the signal-to-noise ratio of the new beating part signal is less than the first preset signal-to-noise ratio threshold, and the transmitted light intensity of the light source after the driving current is increased is greater than the first preset light intensity threshold, it means that the projected light intensity of the light source has reached the maximum light intensity threshold and the driving current can no longer be increased. In order to ensure the safety of the equipment, the current driving current can be directly used as the measurement current of the light source.

[0092] Of course, if the signal-to-noise ratio of the pulsating signal is greater than or equal to the first preset signal-to-noise ratio threshold and less than the second preset signal-to-noise ratio, the current driving current can be directly used as the measurement current of the light source. It can be understood that in the low perfusion state, the effective component amplitude of the AC part is small, that is, Small, by increasing the driving current can enhance the LED light intensity, at this time will become larger, and Relatively unchanged, because It is mainly affected by ambient light and inherent circuit noise. Changing the light intensity will not have much impact on it. / It will become relatively larger. By continuously changing the LED driving current, the best signal-to-noise ratio can be obtained eventually.

[0093] When the skin color of the user's finger is darker, most of the light is absorbed by the skin, and the light passing through the finger is relatively weak. The corresponding AC signal amplitude will also become smaller, resulting in a smaller signal-to-noise ratio of the AC signal. Therefore, the light intensity passing through the finger can be increased by increasing the driving current. will become larger, and Relatively unchanged, / It will become relatively larger. By continuously changing the LED driving current, the best signal-to-noise ratio can be obtained eventually.

[0094] In the case of strong ambient light, Larger, in Under the condition of unchanged / will become smaller, that is, the signal-to-noise ratio of the AC signal is smaller, so the LED light intensity can be increased by increasing the drive current. It will get bigger. / By continuously changing the LED driving current, the best signal-to-noise ratio can be obtained.

[0095] That is, in the embodiment of the present invention, no matter if it encounters low perfusion, dark skin patients or strong ambient light, the LED can be adjusted automatically to achieve the best signal-to-noise ratio through this solution. Whether it is for users with different skin colors, different finger thicknesses, or different perfusion indexes, accurate measurement results can be provided.

[0096] In one embodiment, the method may further include:

[0097] When the signal-to-noise ratio of the pulsating portion signal is greater than a second preset signal-to-noise ratio threshold and the transmitted light intensity of the light source is greater than or equal to the second preset light intensity threshold, the driving current of the light source is controlled to decrease based on the preset current step; wherein the second preset signal-to-noise ratio threshold is greater than the first preset signal-to-noise ratio threshold, and the second preset light intensity threshold is less than the first preset light intensity threshold;

[0098] Determine the signal-to-noise ratio of the new beating part signal according to the blood oxygen signal collected after the driving current is reduced;

[0099] When the signal-to-noise ratio of the new beating portion signal is greater than the second preset signal-to-noise ratio threshold, and the transmitted light intensity of the light source after reducing the driving current is greater than or equal to the second preset light intensity threshold, return to the step of controlling the driving current of the light source to reduce based on the preset current step, until the signal-to-noise ratio of the new beating portion signal is less than or equal to the second preset signal-to-noise ratio threshold, and the transmitted light intensity of the light source is greater than or equal to the second preset light intensity threshold, and the final driving current is used as the measurement current of the light source;

[0100] When the signal-to-noise ratio of the new beating part signal is less than or equal to the second preset signal-to-noise ratio threshold, and the transmitted light intensity of the light source after reducing the driving current is greater than or equal to the second preset light intensity threshold, the current driving current is used as the measurement current of the light source.

[0101] It should be noted that if the signal-to-noise ratio of the AC part is greater than the second preset signal-to-noise ratio threshold (the second preset signal-to-noise ratio threshold may be the maximum signal-to-noise ratio threshold), it means that the signal-to-noise ratio of the AC signal is high, the measurement error of the AC signal is small, and the accuracy of the measurement result calculated based on the AC signal is high. Since the transmitted light intensity of the light source is greater than or equal to the second preset light intensity threshold, it means that the transmitted light intensity of the light source can be smaller. Therefore, in order to save power consumption, the driving current of the light source can be gradually reduced according to the preset current step size based on the current driving current, so that power consumption can be saved while ensuring the accuracy of the calculation result. In the process of reducing the driving current, if the signal-to-noise ratio of the new beating part signal is greater than the second preset signal-to-noise ratio threshold and the transmitted light intensity of the light source is greater than or equal to the second preset light intensity threshold, the driving current can continue to be reduced. If the signal-to-noise ratio of the new beating part signal is greater than the second preset signal-to-noise ratio threshold, but the transmitted light intensity of the light source is less than the second preset light intensity threshold, the driving current can no longer be reduced, and the driving current at this time is used as the measurement current of the light source. Blood oxygen data is collected under this measurement current and the final blood oxygen saturation is calculated.

[0102] Of course, if the signal-to-noise ratio of the pulsating part signal is less than or equal to the second preset signal-to-noise ratio threshold, and greater than or equal to the first preset signal-to-noise ratio, and the transmitted light intensity of the light source under the current driving current is within the range of the second preset light intensity threshold and the first preset light intensity threshold, then the current driving current can be directly used as the measurement current of the light source.

[0103] In one embodiment, the method may further include:

[0104] The preset current step length is adjusted according to the preset current step length adjustment information input by the user.

[0105] In order to improve the convenience for staff or users to use blood oxygen monitoring equipment, a preset current step adjustment function can be provided, and users can set the size of the preset current step according to actual needs.

[0106] Through the above process, both signal-to-noise ratio and power consumption can be taken into account. That is, in the case of low perfusion, the signal-to-noise ratio is poor, so the power consumption is increased to enhance the signal-to-noise ratio. In the case of high perfusion, the signal-to-noise ratio is good, so the signal-to-noise ratio is sacrificed to reduce power consumption.

[0107] For example, for users with a low perfusion index, the solution provided by the present invention can automatically increase the LED brightness according to the signal-to-noise ratio of the AC signal until the ideal state is reached. For users with a high perfusion index, the LED brightness can be automatically reduced according to the signal-to-noise ratio of the AC signal. Regardless of the type of user group, the present invention can complete the measurement task in the most appropriate way while minimizing energy waste.

[0108] In addition, if the ambient light is dark, the noise in the AC signal is small, and the required LED light source brightness is small to obtain a better signal-to-noise ratio. However, when the ambient light is strong and unstable, the noise in the AC signal is large, and the LED light source brightness needs to be increased to increase the signal amplitude, thereby improving the signal-to-noise ratio. Therefore, even for the same user, the present invention can adjust the LED brightness in real time according to the signal-to-noise ratio of the AC signal in different environments to achieve the best signal-to-noise ratio and the lowest energy consumption.

[0109] The present invention also provides a corresponding device for the blood oxygen monitoring method, which further makes the method more practical. Among them, the device can be described from the perspective of functional modules and hardware. The blood oxygen monitoring device provided by the present invention is introduced below. The device is used to implement the blood oxygen monitoring method provided by the present invention. In this embodiment, the blood oxygen monitoring device may include or be divided into one or more program modules, and the one or more program modules are stored in a storage medium and executed by one or more processors to complete the blood oxygen monitoring method disclosed in the above embodiment. The program module referred to in the present invention refers to a series of computer program instruction segments that can complete specific functions, which is more suitable for describing the execution process of the blood oxygen monitoring device in the storage medium than the program itself. The following description will specifically introduce the functions of each program module of this embodiment. The blood oxygen monitoring device described below and the blood oxygen monitoring method described above can be referenced to each other.

[0110] From the perspective of functional modules, see Figure 7 , Figure 7 This is a structural diagram of a blood oxygen monitoring device provided by the present invention. The device is applied to a blood oxygen monitoring device and may include:

[0111] The acquisition module 11 is used to acquire the blood oxygen signal when a finger is detected to be inserted into the blood oxygen monitoring device;

[0112] A calculation module 12, used to determine the signal-to-noise ratio of the pulsation signal according to the blood oxygen signal;

[0113] The first control module 13 is used to control the driving current of the light source in the blood oxygen monitoring device to increase when the signal-to-noise ratio of the pulsation part signal is lower than a first preset signal-to-noise ratio threshold.

[0114] In one embodiment, the calculation module 12 includes:

[0115] A filtering unit, used for filtering the non-pulsating part signal from the blood oxygen signal through a high-pass filter to obtain the pulsating part signal;

[0116] A separation unit, used for separating effective signals and noise signals from the pulsation part signal;

[0117] A first determining unit, configured to determine an effective signal average power according to the effective signal;

[0118] A second determining unit, configured to determine an average power of the noise signal according to the noise signal;

[0119] The third determination unit is used to determine the signal-to-noise ratio of the pulsation signal according to the average power of the effective signal and the average power of the noise signal.

[0120] In one embodiment, the first control module 13 is used to:

[0121] The driving current of a light source in a blood oxygen monitoring device is controlled to increase based on a preset current step size.

[0122] In one embodiment, it further includes:

[0123] A first determination module is used to determine the signal-to-noise ratio of the new beating part signal according to the blood oxygen signal collected after the driving current is increased;

[0124] A first judging module is used to judge whether the signal-to-noise ratio of the new beating part signal is greater than or equal to a first preset signal-to-noise ratio threshold, and whether the transmitted light intensity of the light source after the driving current is increased is less than or equal to a first preset light intensity threshold;

[0125] A second determination module is used to return to the step of increasing the driving current of the light source in the blood oxygen monitoring device based on the preset current step length when the signal-to-noise ratio of the new beating portion signal is less than a first preset signal-to-noise ratio threshold and the transmitted light intensity of the light source is less than or equal to the first preset light intensity threshold, until the signal-to-noise ratio of the new beating portion signal is greater than or equal to the first preset signal-to-noise ratio threshold and the transmitted light intensity of the light source is less than or equal to the first preset light intensity threshold, and the final driving current is used as the measurement current of the light source;

[0126] a third determination module, configured to use the current driving current as the measurement current of the light source when the signal-to-noise ratio of the new beating part signal is greater than or equal to the first preset signal-to-noise ratio threshold and the transmitted light intensity of the light source after the driving current is increased is less than or equal to the first preset light intensity threshold;

[0127] The fourth determination module is used to use the current driving current as the measurement current of the light source when the signal-to-noise ratio of the new beating part signal is less than the first preset signal-to-noise ratio threshold and the transmitted light intensity of the light source after increasing the driving current is greater than the first preset light intensity threshold.

[0128] In one embodiment, it further includes:

[0129] a second control module, configured to control the driving current of the light source to decrease based on a preset current step length when the signal-to-noise ratio of the pulsating portion signal is greater than a second preset signal-to-noise ratio threshold and the transmitted light intensity of the light source is greater than or equal to the second preset light intensity threshold; wherein the second preset signal-to-noise ratio threshold is greater than the first preset signal-to-noise ratio threshold, and the second preset light intensity threshold is less than the first preset light intensity threshold;

[0130] A fifth determination module, used to determine the signal-to-noise ratio of the new beating part signal according to the blood oxygen signal collected after the driving current is reduced;

[0131] A sixth determination module is used to return to the step of controlling the reduction of the driving current of the light source based on the preset current step length when the signal-to-noise ratio of the new beating portion signal is greater than the second preset signal-to-noise ratio threshold and the transmitted light intensity of the light source after the driving current is reduced is greater than or equal to the second preset light intensity threshold, until the signal-to-noise ratio of the new beating portion signal is less than or equal to the second preset signal-to-noise ratio threshold and the transmitted light intensity of the light source is greater than or equal to the second preset light intensity threshold, and use the final driving current as the measurement current of the light source;

[0132] The seventh determination module is used to use the current driving current as the measurement current of the light source when the signal-to-noise ratio of the new beating part signal is greater than the second preset signal-to-noise ratio threshold and the transmitted light intensity of the light source after reducing the driving current is less than the second preset light intensity threshold.

[0133] In one embodiment, it further includes:

[0134] The adjustment module is used to adjust the preset current step length according to the preset current step length adjustment information input by the user.

[0135] In one embodiment, it further includes:

[0136] A third control module is used to control the light source to enter a low power consumption working mode when it is detected that a probe is inserted into the blood oxygen monitoring device;

[0137] The acquisition module 11 is used for:

[0138] When a finger is detected to be inserted into the blood oxygen monitoring device, the driving current of the light source is controlled to be the default working current, and the blood oxygen signal is collected.

[0139] It should be noted that the blood oxygen monitoring device provided in the embodiment of the present invention has the same beneficial effects as the blood oxygen monitoring method provided in the above embodiment, and for the specific introduction of the blood oxygen monitoring method involved in the embodiment of the present invention, please refer to the above embodiment, and this application will not go into details here.

[0140] On the basis of the above embodiments, the present invention provides a blood oxygen monitoring device on the other hand, including: a light source, a photoelectric sensor, a processor and a driver; wherein:

[0141] The processor is used to control the photoelectric sensor to collect the blood oxygen signal when a finger is detected to be inserted into the blood oxygen monitoring device, and determine the signal-to-noise ratio of the pulsating part signal according to the blood oxygen signal. When the signal-to-noise ratio of the pulsating part signal is lower than a first preset signal-to-noise ratio threshold, the driver controls the driving current of the light source to increase.

[0142] It should be noted that the circuit structure diagram of the blood oxygen detection device in the embodiment of the present invention is as follows Figure 8 As shown, it may include a light source (such as an LED light source), a photoelectric sensor, a processor, a driving circuit, a power supply and a display, wherein the LED light source includes a red light LED and an infrared light LED, and the driving current of the light source is adjustable; the photoelectric sensor can be used to detect the light transmittance of the user's finger; the processor can receive the data collected from the photoelectric sensor, and obtain the signal-to-noise ratio of the AC part of the blood oxygen signal, and further calculate and adjust the brightness of the LED in real time according to the signal-to-noise ratio to achieve the best signal-to-noise ratio and the required minimum LED brightness under the current conditions; the LED driving circuit is used to adjust the brightness of the LED according to the control signal sent by the processing unit to cooperate with the processing unit; the power supply is responsible for the power supply and management of the entire system to ensure that the device can operate in low power consumption mode. The embodiment of the present invention may also include a display to display the current blood oxygen saturation value and related parameters, and provide a manual setting option for the user to adjust.

[0143] Among them, the processor may include one or more processing cores, such as a 4-core processor, an 8-core processor, etc. The processor can be implemented in at least one hardware form of DSP (Digital Signal Processing), FPGA (Field-Programmable Gate Array), and PLA (Programmable Logic Array). The processor may also include a main processor and a coprocessor. The main processor is a processor for processing data in the awake state, also known as CPU (Central Processing Unit); the coprocessor is a low-power processor for processing data in the standby state. In some embodiments, the processor may be integrated with a GPU (Graphics Processing Unit), which is responsible for rendering and drawing the content to be displayed on the display screen. In some embodiments, the processor may also include an AI (Artificial Intelligence) processor, which is used to process computing operations related to machine learning.

[0144] On the basis of the above embodiments, the present invention further provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the steps of the above blood oxygen monitoring method are implemented.

[0145] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0146] It should also be noted that, in this specification, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0147] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0148] The steps of the method or algorithm described in conjunction with the embodiments disclosed herein may be implemented directly using hardware, a software module executed by a processor, or a combination of the two. The software module may be placed in a random access memory (RAM), a memory, a read-only memory (ROM), an electrically programmable ROM, an electrically erasable programmable ROM, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0149] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A blood oxygen monitoring method, characterized in that: Applied to blood oxygen monitoring equipment, including: When a finger is detected to be inserted into the blood oxygen monitoring device, the blood oxygen signal is collected; Determine the signal-to-noise ratio of the pulsation signal according to the blood oxygen signal; When the signal-to-noise ratio of the pulsating portion signal is lower than a first preset signal-to-noise ratio threshold, the driving current of the light source in the blood oxygen monitoring device is controlled to increase.

2. The blood oxygen monitoring method according to claim 1, characterized in that: Determining the signal-to-noise ratio of the pulsating portion signal according to the blood oxygen signal comprises: The non-pulsating signal is filtered out from the blood oxygen signal by a high-pass filter to obtain a pulsating signal; Separating effective signals and noise signals from the pulsating portion signal; Determine the effective signal average power according to the effective signal; Determine the average power of the noise signal according to the noise signal; The signal-to-noise ratio of the pulsating signal is determined according to the effective signal average power and the noise signal average power.

3. The blood oxygen monitoring method according to claim 1, characterized in that: The step of controlling the driving current of the light source in the blood oxygen monitoring device to increase includes: The driving current of the light source in the blood oxygen monitoring device is controlled to increase based on a preset current step size.

4. The blood oxygen monitoring method according to claim 3, characterized in that: After the driving current of the light source in the blood oxygen monitoring device is increased by controlling the preset current step length, the method further includes: Determine the signal-to-noise ratio of the new beating part signal according to the blood oxygen signal collected after the driving current is increased; Determine whether the signal-to-noise ratio of the new beating part signal is greater than or equal to the first preset signal-to-noise ratio threshold, and whether the transmitted light intensity of the light source after increasing the driving current is less than or equal to the first preset light intensity threshold; In the case where the signal-to-noise ratio of the new beating portion signal is less than the first preset signal-to-noise ratio threshold, and the transmitted light intensity of the light source is less than or equal to the first preset light intensity threshold, returning to the step of increasing the driving current of the light source in the blood oxygen monitoring device based on the preset current step length until the signal-to-noise ratio of the new beating portion signal is greater than or equal to the first preset signal-to-noise ratio threshold, and the transmitted light intensity of the light source is less than or equal to the first preset light intensity threshold, and the final driving current is used as the measurement current of the light source; When the signal-to-noise ratio of the new beating part signal is greater than or equal to the first preset signal-to-noise ratio threshold, and the transmitted light intensity of the light source after the driving current is increased is less than or equal to the first preset light intensity threshold, the current driving current is used as the measurement current of the light source; When the signal-to-noise ratio of the new beating part signal is less than the first preset signal-to-noise ratio threshold, and the transmitted light intensity of the light source is greater than the first preset light intensity threshold after the driving current is increased, the current driving current is used as the measurement current of the light source.

5. The blood oxygen monitoring method according to claim 4, characterized in that: Also includes: When the signal-to-noise ratio of the pulsating portion signal is greater than a second preset signal-to-noise ratio threshold, and the transmitted light intensity of the light source is greater than or equal to a second preset light intensity threshold, the driving current of the light source is controlled to decrease based on the preset current step; wherein the second preset signal-to-noise ratio threshold is greater than the first preset signal-to-noise ratio threshold, and the second preset light intensity threshold is less than the first preset light intensity threshold; Determine the signal-to-noise ratio of the new beating part signal according to the blood oxygen signal collected after the driving current is reduced; In the case where the signal-to-noise ratio of the new beating portion signal is greater than the second preset signal-to-noise ratio threshold, and the transmitted light intensity of the light source after reducing the driving current is greater than or equal to the second preset light intensity threshold, returning to the step of controlling the driving current of the light source to reduce based on the preset current step, until the signal-to-noise ratio of the new beating portion signal is less than or equal to the second preset signal-to-noise ratio threshold, and the transmitted light intensity of the light source is greater than or equal to the second preset light intensity threshold, and the final driving current is used as the measurement current of the light source; When the signal-to-noise ratio of the new beating part signal is greater than the second preset signal-to-noise ratio threshold, and the transmitted light intensity of the light source after reducing the driving current is less than the second preset light intensity threshold, the current driving current is used as the measurement current of the light source.

6. The blood oxygen monitoring method according to claim 3, characterized in that: Also includes: The preset current step length is adjusted according to the preset current step length adjustment information input by the user.

7. The blood oxygen monitoring method according to claim 3, characterized in that: When a finger is detected to be inserted into the blood oxygen monitoring device, before collecting the blood oxygen signal, the following steps are also included: When a probe is detected to be inserted into the blood oxygen monitoring device, the light source is controlled to enter a low power consumption working mode; When a finger is detected to be inserted into the blood oxygen monitoring device, collecting the blood oxygen signal includes: When it is detected that a finger is inserted into the blood oxygen monitoring device, the driving current of the light source is controlled to be a default working current, and a blood oxygen signal is collected.

8. A blood oxygen monitoring device, characterized in that: Applied to blood oxygen monitoring equipment, including: A collection module, used to collect blood oxygen signals when a finger is detected to be inserted into the blood oxygen monitoring device; A calculation module, used for determining a signal-to-noise ratio of a pulsating signal according to the blood oxygen signal; The first control module is used to control the driving current of the light source in the blood oxygen monitoring device to increase when the signal-to-noise ratio of the pulsating part signal is lower than a first preset signal-to-noise ratio threshold.

9. A blood oxygen monitoring device, characterized in that: include: A light source, a photoelectric sensor, a processor, and a driver; wherein: The processor is used to control the photoelectric sensor to collect the blood oxygen signal when a finger is detected to be inserted into the blood oxygen monitoring device, and determine the signal-to-noise ratio of the pulsating part signal according to the blood oxygen signal, and control the driving current of the light source to increase through the driver when the signal-to-noise ratio of the pulsating part signal is lower than a first preset signal-to-noise ratio threshold.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the blood oxygen monitoring method according to any one of claims 1 to 7 are implemented.

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