Blood oxygen value determination method and device, equipment, storage medium and program product

Abstract

The invention relates to a blood oxygen value determination method and device, equipment, a storage medium and a program product. The method comprises the following steps: acquiring a photoelectric volume pulse wave signal; when the signal quality of the photoelectric volume pulse wave signal does not meet the preset requirement, the sliding module is controlled to slide, so that the photoelectric sensor is moved to a target position; a target photoelectric volume pulse wave signal is obtained, the blood oxygen value of the measured object is determined according to the target photoelectric volume pulse wave signal, the target photoelectric volume pulse wave signal is a signal obtained when the photoelectric sensor is located at the target position, and the signal quality of the target photoelectric volume pulse wave signal meets the preset requirement. By adopting the method, the blood oxygen value determination accuracy can be improved.

Description

Technical Field

[0001] The present application relates to the field of pulse oximeter technology, and in particular to a method, apparatus, device, storage medium, and program product for determining a blood oxygen value. Background Art

[0002] Blood oxygen value, also known as blood oxygen saturation, is one of the important basic data in clinical medicine. The blood oxygen value refers to the percentage of the combined O2 capacity in the total blood volume to the total available O2 capacity. The normal blood oxygen value of the human body should be between 94% and 98%. The blood oxygen value can be tested by a pulse oximeter.

[0003] Currently, existing pulse oximeters are usually of the finger-clip contact type. Due to the consideration of detection accuracy, blood oxygen saturation is most often measured on the finger.

[0004] However, the accuracy of blood oxygen values ​​measured by existing pulse oximeters is low. Summary of the Invention

[0005] Based on this, it is necessary to provide a blood oxygen value determination method, device, equipment, storage medium and program product that can accurately determine the blood oxygen value to address the above technical problems.

[0006] In a first aspect, the present application provides a method for determining a blood oxygen value, which is used in a control module of a finger-clip pulse oximeter. The finger-clip pulse oximeter includes a control module, a photoelectric sensor, and a sliding module. The sliding module is connected to both the photoelectric sensor and the control module and is used to adjust the position of the photoelectric sensor under the control of the control module. The method includes:

[0007] Acquiring photoplethysmography signals;

[0008] When the signal quality of the photoplethysmography signal does not meet the preset requirements, controlling the sliding module to slide to move the photoelectric sensor to a target position;

[0009] A target photoplethysmography signal is obtained, and the blood oxygen value of the subject is determined based on the target photoplethysmography signal, wherein the target photoplethysmography signal is a signal obtained when the photoelectric sensor is at a target position, and the signal quality of the target photoplethysmography signal meets preset requirements.

[0010] In one embodiment, when the signal quality of the photoplethysmography signal does not meet a preset requirement, controlling the sliding module to slide to move the photoelectric sensor to a target position includes:

[0011] When the signal quality does not meet the preset requirements, the sliding module is controlled to move in different directions in sequence to move the photoelectric sensor to a different position;

[0012] obtaining candidate photoplethysmographic signals obtained by the photoelectric sensor at different positions;

[0013] The target position is determined based on each candidate photoplethysmography signal.

[0014] In one embodiment, the target position includes a target direction and a target displacement distance, and determining the target position based on each candidate photoplethysmography signal includes:

[0015] Determine the target direction based on candidate photoplethysmography signals corresponding to different directions;

[0016] determining the target displacement based on the candidate photoplethysmography signals corresponding to the target direction;

[0017] The target position is determined based on the target direction and target displacement.

[0018] In one embodiment, determining a target direction based on candidate photoplethysmography signals corresponding to different directions includes:

[0019] Determine the DC component, AC component, rising edge duration, and falling edge duration per unit time of each candidate photoplethysmography signal;

[0020] For each candidate photoplethysmography signal, a direction parameter is determined according to the DC component, AC component, rising edge duration, and falling edge duration per unit time;

[0021] The direction corresponding to the maximum value of each direction parameter is used as the target direction.

[0022] In one embodiment, determining the target displacement based on the candidate photoplethysmography signal corresponding to the target direction includes:

[0023] Get the ambient light intensity;

[0024] determining a signal strength according to an average value of an AC component per unit time of a candidate photoplethysmography signal corresponding to the target direction;

[0025] The target displacement is determined based on the ambient light intensity, signal strength, and directional parameters corresponding to the target direction.

[0026] In one embodiment, before controlling the sliding module to slide to move the photoelectric sensor to the target position, the method further includes:

[0027] Send an alarm message, which is used to instruct the measured object to remain still.

[0028] In a second aspect, the present application further provides a blood oxygen value determination device, which is provided in a control module in a finger-clip pulse oximeter. The finger-clip pulse oximeter includes a control module, a photoelectric sensor, and a sliding module. The sliding module is connected to both the photoelectric sensor and the control module and is used to adjust the position of the photoelectric sensor under the control of the control module. The blood oxygen value determination device includes:

[0029] An acquisition module, used for acquiring a photoplethysmography signal;

[0030] an adjustment module, configured to control the sliding module to slide so as to move the photoelectric sensor to a target position when the signal quality of the photoplethysmography signal does not meet a preset requirement;

[0031] A determination module is used to obtain a target photoplethysmography signal and determine the blood oxygen value of the subject based on the target photoplethysmography signal, wherein the target photoplethysmography signal is a signal obtained when the photoelectric sensor is at a target position, and the signal quality of the target photoplethysmography signal meets preset requirements.

[0032] In one embodiment, the adjustment module is specifically used to control the sliding module to move in different directions in sequence to move the photoelectric sensor to different positions when the signal quality does not meet the preset requirements; obtain candidate photoplethysmography signals obtained by the photoelectric sensor at different positions; and determine the target position based on each candidate photoplethysmography signal.

[0033] In one embodiment, the target position includes a target direction and a target displacement distance, and the adjustment module is specifically used to determine the target direction based on candidate photoplethysmography signals corresponding to different directions; determine the target displacement based on the candidate photoplethysmography signals corresponding to the target direction; and determine the target position based on the target direction and the target displacement.

[0034] In one embodiment, the adjustment module is specifically used to determine the DC component, AC component, rising edge duration, and falling edge duration of each candidate photoplethysmography signal per unit time; for each candidate photoplethysmography signal, a direction parameter is determined based on the DC component, AC component, rising edge duration, and falling edge duration per unit time; and the direction corresponding to the maximum value of each direction parameter is used as the target direction.

[0035] In one embodiment, the adjustment module is specifically used to obtain the ambient light intensity; determine the signal strength based on the average value of the AC component per unit time of the candidate photoplethysmography signal corresponding to the target direction; and determine the target displacement based on the ambient light intensity, the signal strength, and the direction parameter corresponding to the target direction.

[0036] In one embodiment, the adjustment module is further configured to send an alarm message, where the alarm message is configured to instruct the measured object to remain still.

[0037] In a third aspect, the present application also provides a finger-clip pulse oximeter device, comprising a sliding module, a control module, and a photoelectric sensor;

[0038] The photoelectric sensor is used to obtain a photoplethysmography signal and send the photoplethysmography signal to the control module;

[0039] The sliding module is connected to both the photoelectric sensor and the control module, and is used to adjust the position of the photoelectric sensor under the control of the control module;

[0040] The control module is used to obtain a photoplethysmography signal. When the signal quality of the photoplethysmography signal does not meet preset requirements, the control module is controlled to slide to move the photoelectric sensor to a target position, obtain a target photoplethysmography signal, and determine the blood oxygen value of the subject based on the target photoplethysmography signal, wherein the target photoplethysmography signal is a signal obtained by the photoelectric sensor at the target position, and the signal quality of the target photoplethysmography signal meets preset requirements.

[0041] In one embodiment, the photoelectric sensor includes a light signal receiver and at least two light signal transmitters, and the interval between each light signal transmitter and the light signal receiver in the pulse oximeter is 120 degrees.

[0042] In one embodiment, the sliding module includes two driving motors, each driving motor is used to drive the photoelectric sensor to move forward and backward or left and right.

[0043] In a fourth aspect, the present application further provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements any of the methods described in the first aspect above.

[0044] In a fifth aspect, the present application also provides a computer program product, comprising a computer program, which, when executed by a processor, implements any of the methods described in the first aspect above.

[0045] The above-mentioned blood oxygen value determination method, device, equipment, storage medium and program product are used in the control module of a finger-clip pulse oximeter. The finger-clip pulse oximeter includes a control module, a photoelectric sensor and a sliding module. The sliding module is connected to the photoelectric sensor and the control module and is used to adjust the position of the photoelectric sensor under the control of the control module. The method includes: obtaining a photoelectric volumetric pulse wave signal; when the signal quality of the photoelectric volumetric pulse wave signal does not meet the preset requirements, controlling the sliding module to slide to move the photoelectric sensor to a target position; obtaining a target photoelectric volumetric pulse wave signal, and determining the blood oxygen value of the subject based on the target photoelectric volumetric pulse wave signal, wherein the target photoelectric volumetric pulse wave signal is the signal obtained when the photoelectric sensor is at the target position, and the signal quality of the target photoelectric volumetric pulse wave signal meets the preset requirements. In the above-mentioned method, by controlling the photoelectric sensor to move to the target position, a target photoelectric volumetric pulse wave signal that meets the signal quality is obtained, so that the accuracy of the determination of the blood oxygen value based on the target photoelectric volumetric pulse wave signal can be effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following briefly introduces the drawings required for use in the embodiments of the present application or related technical descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying any creative work.

[0047] Figure 1 A schematic structural diagram of a finger-clip pulse oximeter according to an embodiment;

[0048] Figure 2 1 is a flow chart of a method for determining a blood oxygen value in one embodiment;

[0049] Figure 3 FIG1 is a flow chart of the steps of moving a photoelectric sensor to a target position in one embodiment;

[0050] Figure 4 Schematic diagram of a flow chart of a step of determining a target location in one embodiment;

[0051] Figure 5 A schematic flow chart of a step of determining a target direction in one embodiment;

[0052] Figure 6 FIG. 1 is a flow chart of a step of determining a target displacement in one embodiment;

[0053] Figure 7 is a flow chart of a method for determining a blood oxygen value in another embodiment;

[0054] Figure 8FIG. 1 is a structural block diagram of a device for determining a blood oxygen value in one embodiment. DETAILED DESCRIPTION

[0055] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0056] Blood oxygen value, also known as blood oxygen saturation, is one of the important basic data in clinical medicine. The blood oxygen value refers to the percentage of the combined O2 capacity in the total blood volume to the total available O2 capacity. The normal blood oxygen value of the human body should be between 94% and 98%. The blood oxygen value can be tested by a pulse oximeter.

[0057] Currently, existing pulse oximeters are usually of the finger-clip contact type. Due to the consideration of detection accuracy, blood oxygen saturation is most often measured on the finger.

[0058] However, the sensor transmission holes designed on the upper and lower covers of existing pulse oximeters need to be precisely aligned, which places corresponding requirements on the amplification factor of the circuit design and the circuit control circuit design of the light-emitting diode. As a result, the accuracy of the blood oxygen value measured by the existing pulse oximeter is relatively low.

[0059] In view of this, the embodiment of the present application provides a method for determining blood oxygen value that can effectively improve the accuracy of blood oxygen value detection. The method for determining blood oxygen value provided in the embodiment of the present application can be applied to Figure 1 The control module in the finger-clip pulse oximeter device 10 shown in FIG. 1 includes a sliding module 101, a control module (not shown), and a photosensor 102. The photosensor 102 is used to acquire a photoplethysmography signal and transmit the signal to the control module. The sliding module 101 is connected to both the photosensor 102 and the control module and is used to adjust the position of the photosensor under the control of the control module. The control module is used to acquire the photoplethysmography signal and, when the signal quality of the photoplethysmography signal does not meet preset requirements, control the sliding module 101 to slide to move the photosensor 102 to a target position, acquire a target photoplethysmography signal, and determine the blood oxygen value of the subject based on the target photoplethysmography signal. The target photoplethysmography signal is a signal acquired by the photosensor 102 at the target position, and the signal quality of the target photoplethysmography signal meets preset requirements.

[0060] It should be noted that Figure 1 The finger clip pulse oximeter device 10 shown is an inner ring structure of the finger clip pulse oximeter device, and its outer ring finger clip shell is not in the inner ring structure. Figure 1 Shown.

[0061] In an exemplary embodiment, Figure 2 As shown, a method for determining blood oxygen value is provided, which is applied to Figure 1 The control module in the finger clip pulse oximeter is taken as an example to illustrate the method, which includes the following steps 201 to 203. Among them:

[0062] Step 201: Acquire a photoplethysmography signal.

[0063] Optionally, a photoplethysmography signal may be acquired by a photoelectric sensor.

[0064] The photoelectric sensor includes an optical signal receiver and at least two optical signal transmitters. The interval between each optical signal transmitter and the optical signal receiver in the pulse oximeter is 120°, that is, the positions of the optical signal receiver and each optical signal transmitter evenly divide the inner circle of the pulse oximeter.

[0065] Optionally, the optical signal transmitter may be a light emitting diode (LED), and the optical signal receiver may be a photodiode. The types of the optical signal transmitter and the optical signal receiver are not limited in the embodiments of the present application.

[0066] Optionally, the photoplethysmography signal may be a light emitting diode emitting light of a specific wavelength. Due to the light absorption characteristics of hemoglobin in the blood, the light is attenuated when passing through blood vessels. The photodiode detects the changes in the emitted or projected light and converts it into a signal, thereby forming a photoplethysmography (PPG) signal.

[0067] Step 202 : When the signal quality of the photoplethysmography signal does not meet a preset requirement, control the sliding module to slide to move the photoelectric sensor to a target position.

[0068] Optionally, the acquired photoplethysmography signal may be detected to determine the signal quality of the photoplethysmography signal.

[0069] In one possible implementation, it may be determined whether the signal quality of the photoplethysmography signal meets a preset condition based on a machine learning or deep learning evaluation method.

[0070] For example, the characteristics of the photoplethysmography signal can be extracted, and then a machine learning algorithm such as a support vector machine or a random forest is used to classify the signal quality, and whether the preset conditions are met is determined based on the classification results.

[0071] In another possible implementation, whether the signal quality of the photoplethysmography signal meets a preset condition may be determined based on the signal amplitude, signal noise, or waveform shape of the photoplethysmography signal.

[0072] For example, the signal-to-noise ratio of the photoplethysmography signal can be determined, that is, the ratio of signal power to noise power. A higher signal-to-noise ratio indicates better signal quality. Therefore, when the signal-to-noise ratio of the photoplethysmography signal is less than a preset signal-to-noise ratio, it can be determined that the signal quality of the photoplethysmography signal does not meet the preset conditions.

[0073] Exemplarily, the photoplethysmography signal can be segmented to obtain several waveform segments of a preset length, and the average amplitude difference of each waveform segment can be calculated. When the average amplitude difference is within a preset range, it can be determined that the signal quality of the photoplethysmography signal meets the preset conditions. When the average amplitude difference is not within the preset range, it can be determined that the signal quality of the photoplethysmography signal does not meet the preset conditions.

[0074] Optionally, when the signal quality does not meet the preset requirements, the sliding module can be controlled to slide to move the photoelectric sensor to the target position.

[0075] The sliding module includes two driving motors, each of which is used to drive the photoelectric sensor to move forward and backward or left and right, so that the photoelectric sensor can be moved to a target position.

[0076] In a possible implementation, a preset target position may be queried, and the signal quality of the photoplethysmography signal acquired by the photoelectric sensor at the target position meets a preset requirement.

[0077] Exemplarily, at least one target position can be determined according to a calibration method. For example, the position of the photoelectric sensor can be continuously adjusted, and the signal quality of the capacitance product pulse wave signal at that position can be determined. Then, the above process is continuously repeated, and the position where the signal quality meets the preset requirements is determined as the target position and stored in the fingertip pulse oximeter.

[0078] Optionally, when there are multiple preset target positions, one of the multiple preset target positions can be selected according to the current position of the photoelectric sensor, and the device can move to the target position.

[0079] Optionally, when controlling the sliding module to slide to move the photoelectric sensor to the target position, the target number of steps corresponding to the driving motor when reaching the target position can be obtained, and then when the position of the photoelectric sensor is moved, the current number of steps of the driving motor is continuously obtained, and the current number of steps is compared with the target number of steps until the current number of steps is the same as the target number of steps, or the difference between the current number of steps and the target number of steps is less than the preset step difference.

[0080] Step 203: Acquire a target photoplethysmography signal, and determine the blood oxygen value of the subject according to the target photoplethysmography signal.

[0081] The target photoplethysmography signal is a signal obtained by the photoelectric sensor when the photoelectric sensor is at the target position, and the signal quality of the target photoplethysmography signal meets the preset requirements.

[0082] Optionally, after the photoelectric sensor moves to the target position, a target photoplethysmography signal is acquired, and the signal quality of the currently acquired target photoplethysmography signal meets a preset requirement.

[0083] Optionally, the target photoplethysmography signal may be decomposed into an AC component and a DC component, and the blood oxygen value may be determined based on the AC component and the DC component.

[0084] For example, an R value is determined based on the AC component and the DC component, where the R value is the ratio of the AC component to the DC component of the red and infrared light signals. Blood oxygen saturation is then calculated based on the R value and a calibration curve, where the calibration curve is experimentally derived and describes the relationship between the R value and blood oxygen saturation. In the embodiments of the present application, the method for determining the blood oxygen value based on the target photoplethysmography signal is not limited.

[0085] The above-mentioned method for determining blood oxygen value is used in a control module in a finger-clip pulse oximeter. The finger-clip pulse oximeter includes a control module, a photoelectric sensor, and a sliding module. The sliding module is connected to both the photoelectric sensor and the control module and is used to adjust the position of the photoelectric sensor under the control of the control module. The method includes: obtaining a photoelectric volumetric pulse wave signal; when the signal quality of the photoelectric volumetric pulse wave signal does not meet the preset requirements, controlling the sliding module to slide to move the photoelectric sensor to a target position; obtaining a target photoelectric volumetric pulse wave signal, and determining the blood oxygen value of the subject based on the target photoelectric volumetric pulse wave signal, wherein the target photoelectric volumetric pulse wave signal is a signal obtained when the photoelectric sensor is at the target position, and the signal quality of the target photoelectric volumetric pulse wave signal meets the preset requirements. In the above-mentioned method, by controlling the photoelectric sensor to move to the target position, a target photoelectric volumetric pulse wave signal that meets the signal quality is obtained, so that the accuracy of the determination of the blood oxygen value based on the target photoelectric volumetric pulse wave signal can be effectively improved.

[0086] In an exemplary embodiment, Figure 3 As shown, optionally, when the signal quality of the photoplethysmography signal does not meet the preset requirements, controlling the sliding module to slide to move the photoelectric sensor to the target position includes the following steps 301 to 303.

[0087] Step 301 : When the signal quality does not meet the preset requirement, the sliding module is controlled to move in different directions in sequence to move the photoelectric sensor to a different position.

[0088] Optionally, when the signal quality does not meet the preset requirement, the control module may send a movement instruction to the sliding module to move the sliding module, thereby driving the photoelectric sensor to move.

[0089] Exemplarily, the sliding module can be controlled to move a first preset distance from an initial position in the four directions of forward, backward, left and right, respectively. In this way, the LED and photodiode in the photoelectric sensor also move a first preset distance from their respective initial positions in the four directions of forward, backward, left and right, respectively. The initial position includes the respective positions of the sliding module and the LED and photodiode in the photoelectric sensor before receiving the movement instruction.

[0090] Step 302 : Acquire candidate photoplethysmography signals obtained when the photosensor is at different positions.

[0091] Optionally, each time the photoelectric sensor moves to a position, a candidate photoplethysmography signal collected by the photoelectric sensor at the position is acquired.

[0092] Exemplarily, after the photosensor moves forward a first preset distance relative to the initial position, a candidate photoplethysmography signal can be obtained, and then, it returns to the initial position and moves backward from the initial position a first preset distance to obtain another candidate photoplethysmography signal.

[0093] Step 303: Determine the target position according to each candidate photoplethysmography signal.

[0094] In one possible implementation, the signal quality of each candidate photoplethysmography signal may be determined separately, and the position corresponding to the candidate photoplethysmography signal with the best signal quality may be determined as the target position.

[0095] In another possible implementation method, the target direction can be first determined based on each candidate photoplethysmography signal, and then the target displacement distance can be determined, and the target position can be determined based on the target direction and the target displacement distance. In other words, the target position determined by this method is not necessarily the position corresponding to the first preset distance moved from the target direction.

[0096] In the above method, when the signal quality does not meet preset requirements, the sliding module is controlled to move in different directions in sequence to move the photosensor to different positions; candidate photoplethysmography signals are obtained when the photosensor is in different positions; and the target position is determined based on each candidate photoplethysmography signal. In this way, by obtaining candidate photoplethysmography signals corresponding to different positions, the target position can be determined based on the actual detection situation. This improves the accuracy of target position determination, ensures the signal quality of the obtained target photoplethysmography signal, and thus improves the accuracy of blood oxygen level determination.

[0097] In an exemplary embodiment, the target position includes a target direction and a target displacement distance, such as Figure 4 As shown, optionally, determining the target position according to each candidate photoplethysmography signal includes the following steps 401 to 403. In which:

[0098] Step 401 : determining a target direction based on candidate photoplethysmography signals corresponding to different directions.

[0099] In one possible implementation, the signal quality of each candidate photoplethysmography signal may be determined by the method in step 202 , and the target direction may be determined from the candidate photoplethysmography signals corresponding to different directions based on the signal quality.

[0100] Exemplarily, the direction corresponding to the candidate photoplethysmography signal with the best signal quality can be used as the target direction, or the direction corresponding to the candidate photoplethysmography signal whose signal quality meets the preset conditions can be used as the target direction. It can be understood that when there are multiple candidate photoplethysmography signals whose signal quality meets the preset conditions, a direction can be randomly selected from the corresponding multiple directions as the target direction.

[0101] Optionally, when the signal quality of each candidate photoplethysmography signal does not meet the preset conditions, the sliding module can be controlled to slide again and the above step 301 can be re-executed, wherein the sliding module is controlled again to move a second preset distance in different directions in sequence, wherein the second preset distance is greater than the first preset distance.

[0102] In another possible implementation, Figure 5 As shown, optionally, determining the target direction according to the candidate photoplethysmography signals corresponding to different directions includes the following steps 501 to 503. In which:

[0103] Step 501 : Determine the DC component, AC component, rising edge duration, and falling edge duration per unit time of each candidate photoplethysmography signal.

[0104] Optionally, for a candidate photoplethysmography signal, the DC component, AC component, rising edge duration and falling edge duration of the signal within a unit time can be determined, where the unit time can be 1s or 1ms, etc., which is not limited in the embodiments of the present application.

[0105] Among them, the rising edge duration can be the average rising edge duration of all waveforms in the signal per unit time. The rising edge duration of a waveform can be the time required for it to rise from a low level (or low value) to a high level (or high value); the falling edge duration can be the average falling edge duration of all waveforms in the signal per unit time. The falling edge duration of a waveform can be the time required for it to fall from a high level (or high value) to a low level (or low value).

[0106] Optionally, the corresponding DC component and AC component may be determined based on the candidate photoplethysmography signal, and then the DC component per unit time may be determined based on the DC component, and the AC component per unit time may be determined based on the AC component.

[0107] The DC component can be the constant part of the signal, indicating the average value or baseline level of the signal; the AC component is the fluctuating part of the signal.

[0108] In one possible implementation, the DC component may be extracted by a low-pass filter, and the AC component may be extracted by a high-pass filter; or the DC component may be extracted by a moving average method, and the AC component may be extracted by a differential method.

[0109] Step 502 : For each candidate photoplethysmography signal, determine a direction parameter according to the DC component, AC component, rising edge duration, and falling edge duration per unit time.

[0110] Optionally, the average value of the DC component can be determined based on the DC component in unit time, the change of the AC component can be determined based on the AC component in unit time, and then the direction parameter can be determined based on the ratio of the average value of the DC component to the change of the AC component, as well as the rising edge duration and the falling edge duration.

[0111] For example, the direction parameter D can be determined according to the following formula: 方向 :

[0112]

[0113] Among them, n and m are time subscripts, AC n+m is the corresponding final value of the AC component per unit time, AC n is the corresponding starting value of the AC component per unit time, AC n+m -AC n is the change in AC component, DC n+m is the corresponding final value of the DC component per unit time, DC n is the corresponding starting value of the DC component per unit time, Mean(DC n+m , DC n ) is the average value of the DC component, T 数据时长 , t阈值 and a are preset parameters.

[0114] Step 503: The direction corresponding to the maximum value of each direction parameter is used as the target direction.

[0115] Optionally, the direction parameters corresponding to the candidate photoplethysmography signals may be determined according to the above formula, and then the direction parameters may be sorted to determine the maximum value among the direction parameters.

[0116] Optionally, after determining the maximum value among the direction parameters, the direction corresponding to the direction parameter is used as the target direction.

[0117] Step 402 : Determine the target displacement based on the candidate photoplethysmography signal corresponding to the target direction.

[0118] Optionally, after the target direction is determined, the target displacement may be determined based on the target direction and the candidate photoplethysmography signal corresponding to the target direction.

[0119] In one possible implementation, the target direction and the candidate photoplethysmography signal corresponding to the target direction may be input into a pre-trained neural network model to determine the target displacement according to the output of the neural network model.

[0120] Alternatively, the target displacement may be determined based on the number of rotation steps of the drive motor.

[0121] Step 403: Determine the target position according to the target direction and the target displacement.

[0122] Optionally, the target displacement may be the distance between the target position and the initial position on the inner circle of the finger-clip pulse oximeter during the movement of the photoelectric sensor, that is, the photoelectric sensor starts from the initial position, moves along the target direction by the target displacement, and then reaches the target position.

[0123] In the above method, the target direction is determined based on candidate photoplethysmography signals corresponding to different directions; the target displacement is determined based on the candidate photoplethysmography signals corresponding to the target direction; and the target position is determined based on the target direction and target displacement. This allows the target direction to be determined, and then the target displacement to be determined based on the corresponding candidate photoplethysmography signals. This avoids multiple movements when determining the target position, improves the accuracy and efficiency of target position determination, and thus improves the accuracy of blood oxygen level determination.

[0124] In an exemplary embodiment, Figure 6 As shown, optionally, determining the target displacement according to the candidate photoplethysmography signal corresponding to the target direction includes the following steps 601 to 603. In which:

[0125] Step 601: Obtain ambient light intensity.

[0126] Optionally, the ambient light intensity can be collected by an ambient light sensor. The ambient light can be the light generated by any external light source other than the optical signal transmitter during the measurement process. The external light source can be natural light, indoor lighting, a display screen, or any other luminous object.

[0127] It can be understood that the photoplethysmography signals mentioned in the embodiments of the present application are all signals that have been free of ambient light interference, that is, after the signal collected by the optical signal receiver is obtained, it is preprocessed according to the filtering method to remove the noise interference signal.

[0128] Exemplarily, the filtering method may include data filtering or an adaptive filtering algorithm, which is not limited in the embodiments of the present application.

[0129] Step 602 : determining the signal strength according to the average value of the AC component per unit time of the candidate photoplethysmography signal corresponding to the target direction.

[0130] Alternatively, the signal strength R can be determined by the following formula: 信号强度 :

[0131] R 信号强度 =Mean(AC n+m , AC n )

[0132] Step 603: Determine the target displacement according to the ambient light intensity, the signal intensity, and the direction parameter corresponding to the target direction.

[0133] Optionally, the first parameter may be determined according to the ratio of the signal strength to the target direction, and then the target displacement may be determined according to the ratio of the first ratio to the ambient light intensity.

[0134] For example, the target displacement L can be determined according to the following formula: 位移 :

[0135]

[0136] Wherein, b and c are preset proportional coefficients, and d is a preset compensation coefficient.

[0137] In the above method, the ambient light intensity is obtained; the signal strength is determined according to the average value of the AC component per unit time of the candidate photoplethysmography signal corresponding to the target direction; the target displacement is determined according to the ambient light intensity, the signal strength, and the directional parameter corresponding to the target direction, so that the target displacement can be accurately determined, thereby determining the target position.

[0138] In an exemplary embodiment, optionally, before controlling the sliding module to slide to move the photoelectric sensor to the target position, the method further includes:

[0139] Send an alarm message, which is used to instruct the measured object to remain still.

[0140] Optionally, during the movement of the photoelectric sensor, the object to be measured needs to remain still to ensure that the photoelectric sensor can accurately move to various positions and to the target position.

[0141] Optionally, the warning information may include visual warnings, sound warnings, tactile sensations, remote warnings, and combined warnings, etc., which are not limited in the embodiments of the present application.

[0142] For example, the warning information may be sent by flashing lights, beeping sounds, voice reminders, device vibrations, and / or sending text messages or emails.

[0143] As an optional implementation, Figure 7 As shown, the learning appearance determination method provided in the embodiment of the present application may include the following specific steps:

[0144] Step 701: Acquire a photoplethysmography signal.

[0145] Step 702: When the signal quality of the photoplethysmography signal does not meet the preset requirement, an alarm message is sent, where the alarm message is used to instruct the subject to remain still.

[0146] Step 703: Control the sliding module to move in different directions in sequence to move the photoelectric sensor to different positions.

[0147] Step 704 : Acquire candidate photoplethysmography signals obtained when the photosensor is at different positions.

[0148] Step 705 : Determine the DC component, AC component, rising edge duration, and falling edge duration per unit time of each candidate photoplethysmography signal.

[0149] Step 706 : For each candidate photoplethysmography signal, determine a direction parameter according to the DC component, AC component, rising edge duration, and falling edge duration per unit time.

[0150] Step 707: The direction corresponding to the maximum value of each direction parameter is used as the target direction.

[0151] Step 708: Obtain the ambient light intensity.

[0152] Step 709 : determining the signal strength according to the average value of the AC component per unit time of the candidate photoplethysmography signal corresponding to the target direction.

[0153] Step 710: Determine the target displacement according to the ambient light intensity, the signal intensity, and the direction parameter corresponding to the target direction.

[0154] Step 711: Determine the target position according to the target direction and the target displacement.

[0155] Step 712: Acquire a target photoplethysmography signal, and determine the blood oxygen value of the subject according to the target photoplethysmography signal.

[0156] The target photoplethysmography signal is a signal obtained by the photoelectric sensor when the photoelectric sensor is at the target position, and the signal quality of the target photoplethysmography signal meets the preset requirements.

[0157] It should be understood that, although the various steps in the flowcharts involved in the various embodiments described above are displayed in sequence according to the instructions of the arrows, these steps are not necessarily executed in sequence in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order restriction on the execution of these steps, and these steps can be executed in other orders. Moreover, at least a portion of the steps in the flowcharts involved in the various embodiments described above can include multiple steps or multiple stages, and these steps or stages are not necessarily executed and completed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a portion of steps or stages in other steps.

[0158] Based on the same inventive concept, embodiments of the present application further provide an oxygen value determination device for implementing the aforementioned oxygen value determination method. The solution provided by this device is similar to the solution described in the aforementioned method. Therefore, the specific limitations of one or more embodiments of the oxygen value determination device provided below can be found in the above-described limitations of the oxygen value determination method and are not further elaborated here.

[0159] In an exemplary embodiment, Figure 8 As shown, a blood oxygen value determination device 800 is provided, comprising: an acquisition module 801, an adjustment module 802 and a determination module 803, wherein:

[0160] An acquisition module 801 is used to acquire a photoplethysmography signal;

[0161] an adjusting module 802 for controlling the sliding module to slide so as to move the photoelectric sensor to a target position when the signal quality of the photoplethysmography signal does not meet a preset requirement;

[0162] Determination module 803 is used to obtain a target photoplethysmography signal and determine the blood oxygen value of the subject based on the target photoplethysmography signal, wherein the target photoplethysmography signal is a signal obtained when the photoelectric sensor is at the target position, and the signal quality of the target photoplethysmography signal meets preset requirements.

[0163] In one embodiment, the adjustment module 802 is specifically used to control the sliding module to move in different directions in sequence to move the photoelectric sensor to different positions when the signal quality does not meet the preset requirements; obtain candidate photoplethysmography signals obtained by the photoelectric sensor at different positions; and determine the target position based on each candidate photoplethysmography signal.

[0164] In one embodiment, the target position includes a target direction and a target displacement distance, and the adjustment module 802 is specifically configured to determine the target direction based on candidate photoplethysmography signals corresponding to different directions; determine the target displacement based on candidate photoplethysmography signals corresponding to the target direction; and determine the target position based on the target direction and the target displacement.

[0165] In one embodiment, the adjustment module 802 is specifically used to determine the DC component, AC component, rising edge duration, and falling edge duration of each candidate photoplethysmography signal per unit time; for each candidate photoplethysmography signal, determine a direction parameter based on the DC component, AC component, rising edge duration, and falling edge duration per unit time; and use the direction corresponding to the maximum value of each direction parameter as the target direction.

[0166] In one embodiment, the adjustment module 802 is specifically used to obtain the ambient light intensity; determine the signal strength based on the average value of the AC component per unit time of the candidate photoplethysmography signal corresponding to the target direction; and determine the target displacement based on the ambient light intensity, the signal strength, and the direction parameter corresponding to the target direction.

[0167] In one embodiment, the adjustment module 802 is further configured to send an alarm message, where the alarm message is used to instruct the measured object to remain still.

[0168] Each module in the aforementioned blood oxygen value determination device may be implemented in whole or in part via software, hardware, or a combination thereof. Each module may be embedded in or independent of a processor within the fingerclip pulse oximeter device in hardware form, or may be stored in a memory within the fingerclip pulse oximeter device in software form, allowing the processor to call and execute corresponding operations of each module.

[0169] In an exemplary embodiment, Figure 1 As shown, a finger-clip pulse oximeter device 10 is provided, which includes a sliding module 101, a control module and a photoelectric sensor 102;

[0170] The photoelectric sensor 102 is used to obtain a photoelectric volumetric pulse wave signal and send the photoelectric volumetric pulse wave signal to the control module; the sliding module 101 is connected to both the photoelectric sensor 102 and the control module, and is used to adjust the position of the photoelectric sensor under the control of the control module; the control module is used to obtain the photoelectric volumetric pulse wave signal. When the signal quality of the photoelectric volumetric pulse wave signal does not meet the preset requirements, the sliding module 101 is controlled to slide to move the photoelectric sensor 102 to the target position, obtain the target photoelectric volumetric pulse wave signal, and determine the blood oxygen value of the subject based on the target photoelectric volumetric pulse wave signal, wherein the target photoelectric volumetric pulse wave signal is the signal obtained by the photoelectric sensor 102 at the target position, and the signal quality of the target photoelectric volumetric pulse wave signal meets the preset requirements.

[0171] In one embodiment, the photoelectric sensor includes a light signal receiver and at least two light signal transmitters, and the interval between each light signal transmitter and the light signal receiver in the pulse oximeter is 120 degrees.

[0172] In one embodiment, the sliding module includes two driving motors, each driving motor is used to drive the photoelectric sensor to move forward and backward or left and right.

[0173] Those skilled in the art will understand that Figure 1 The structure shown in the figure is merely a block diagram of a portion of the structure related to the solution of the present application, and does not constitute a limitation on the finger-clip pulse oximeter device to which the solution of the present application is applied. The specific finger-clip pulse oximeter device may include more or fewer components than shown in the figure, or combine certain components, or have a different component arrangement.

[0174] In an exemplary embodiment, a finger-clip pulse oximeter device is provided, including a memory and a processor. The memory stores a computer program, and the processor implements the steps described in any of the above method embodiments when executing the computer program.

[0175] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps described in any of the above method embodiments are implemented.

[0176] In one embodiment, a computer program product is provided, comprising a computer program, which implements the steps of any of the above method embodiments when executed by a processor.

[0177] Those skilled in the art will understand that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. In particular, any reference to memory, database, or other media used in the embodiments provided in this application can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The databases involved in the various embodiments provided herein may include at least one of a relational database and a non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the various embodiments provided herein may be, but are not limited to, general-purpose processors, central processing units (CPUs), graphics processing units (GPUs), digital signal processors (DSPs), programmable logic devices (PLDs), quantum computing-based data processing logic devices, artificial intelligence (AI) processors, and the like.

[0178] The technical features of the above embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0179] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present application shall be determined by the appended claims.

Claims

1. A method for determining a blood oxygen value, characterized in that: A control module used in a finger-clip pulse oximeter, the finger-clip pulse oximeter comprising a control module, a photoelectric sensor, and a sliding module, the sliding module being connected to both the photoelectric sensor and the control module and configured to adjust the position of the photoelectric sensor under control of the control module, the method comprising: Acquiring photoplethysmography signals; When the signal quality of the photoplethysmography signal does not meet a preset requirement, controlling the sliding module to slide so as to move the photoelectric sensor to a target position; Obtain a target photoplethysmography signal and determine the blood oxygen value of the subject based on the target photoplethysmography signal, wherein the target photoplethysmography signal is a signal obtained by the photosensor when the photosensor is at the target position, and the signal quality of the target photoplethysmography signal meets preset requirements.

2. The method according to claim 1, characterized in that When the signal quality of the photoplethysmography signal does not meet a preset requirement, controlling the sliding module to slide so as to move the photoelectric sensor to a target position includes: When the signal quality does not meet the preset requirements, controlling the sliding module to move in different directions in sequence to move the photoelectric sensor to a different position; obtaining candidate photoplethysmography signals obtained by the photoelectric sensor at different positions; The target position is determined according to each of the candidate photoplethysmography signals.

3. The method according to claim 2, characterized in that The target position includes a target direction and a target displacement distance, and determining the target position according to each of the candidate photoplethysmography signals includes: determining a target direction according to the candidate photoplethysmography signals corresponding to different directions; determining a target displacement based on a candidate photoplethysmography signal corresponding to the target direction; A target position is determined based on the target direction and the target displacement.

4. The method according to claim 3, characterized in that The determining the target direction according to the candidate photoplethysmography signals corresponding to different directions includes: Determining the DC component, AC component, rising edge duration, and falling edge duration per unit time of each candidate photoplethysmography signal; For each candidate photoplethysmography signal, determining a direction parameter according to the DC component, AC component, rising edge duration, and falling edge duration within the unit time; The direction corresponding to the maximum value of each of the direction parameters is used as the target direction.

5. The method according to claim 4, characterized in that The determining the target displacement according to the candidate photoplethysmography signal corresponding to the target direction includes: Get the ambient light intensity; determining a signal strength according to an average value of an AC component per unit time of the candidate photoplethysmography signal corresponding to the target direction; The target displacement is determined according to the ambient light intensity, the signal intensity, and a direction parameter corresponding to the target direction.

6. The method according to claim 1, characterized in that Before controlling the sliding module to slide to move the photoelectric sensor to a target position, the method further includes: Sending an alarm message, where the alarm message is used to instruct the measured object to remain still.

7. A finger-clip pulse oximeter device, characterized in that: The finger-clip pulse oximeter device includes a sliding module, a control module and a photoelectric sensor; The photoelectric sensor is used to obtain a photoplethysmography signal and send the photoplethysmography signal to the control module; The sliding module is connected to both the photoelectric sensor and the control module, and is used to adjust the position of the photoelectric sensor under the control of the control module; The control module is used to obtain a photoplethysmography signal. When the signal quality of the photoplethysmography signal does not meet preset requirements, the control module is controlled to slide to move the photosensor to a target position, obtain a target photoplethysmography signal, and determine the blood oxygen value of the subject based on the target photoplethysmography signal, wherein the target photoplethysmography signal is a signal obtained by the photosensor at the target position, and the signal quality of the target photoplethysmography signal meets preset requirements.

8. The finger-clip pulse oximeter device according to claim 6, characterized in that: The photoelectric sensor includes a light signal receiver and at least two light signal transmitters, and the interval between each light signal transmitter and the light signal receiver in the pulse oximeter is 120 degrees.

9. The finger-clip pulse oximeter device according to claim 1, characterized in that: The sliding module includes two driving motors, each of which is used to drive the photoelectric sensor to move forward and backward or left and right.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

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