CN111297341A - Developments blood pressure check out test set and pulse wave characteristic extraction equipment - Google Patents
Developments blood pressure check out test set and pulse wave characteristic extraction equipment Download PDFInfo
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- A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
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Abstract
The embodiment of the present disclosure provides a dynamic blood pressure detection device and a pulse wave feature extraction device, the dynamic blood pressure detection device includes: a light emitting part configured to alternately emit light having different wavelengths at predetermined time intervals; a receiver configured to acquire a first PPG signal corresponding to light of a first wavelength and a second PPG signal corresponding to light of a second wavelength; a processor configured to extract pulse wave characteristic parameters in the first PPG signal and the second PPG signal, respectively, to obtain a first pulse wave characteristic parameter satisfying a first predetermined condition; and measuring the dynamic blood pressure value of the tested user according to the first pulse wave characteristic parameter and a preset dynamic blood pressure detection model of the tested user. The dynamic blood pressure detection equipment of the embodiment of the disclosure distinguishes two paths of reflected lights through the wavelength of the light source, so that only one receiver is needed, the size of the dynamic blood pressure detection equipment is greatly reduced, the dynamic blood pressure detection equipment is convenient for a user to wear, and the use experience of the user is improved.
Description
Technical Field
The disclosure relates to the field of medical equipment, in particular to dynamic blood pressure detection equipment and pulse wave feature extraction equipment.
Background
The blood pressure recorder is used for measuring the instantaneous blood pressure value of one person at intervals of a certain time within 24 hours day and night, the dynamic blood pressure detection is called, the measurement is generally carried out 1 time within 15-30 minutes, and the average value of the blood pressure in 24 hours is taken. The dynamic blood pressure measured by the above dynamic blood pressure measuring process has continuity, and the dynamic blood pressure generally includes: systolic pressure, diastolic pressure, heart rate and their highest and lowest values, mean arterial pressure, valley peak ratio, standard deviation, systolic and diastolic blood pressure load, etc.
The existing relatively mature dynamic blood pressure detection methods include a constant volume method, a flat tension method, an optical plethysmography and the like. There are three main forms of ambulatory blood pressure detection based on photoplethysmography:
(1) electrocardiographic (ECG, E1 electrocardiograph) and photoplethysmographic (PPG) signals: a mapping model is established by calculating Pulse Transit Time (PTT) or human body Pulse Wave Velocity (PWV) and blood pressure, and the ECG signal and the PPG signal are acquired in different modes, so that the complexity of equipment is increased, and the measurement is inconvenient.
(2) Multiplex PPG signal combining: a mapping model is established by calculating Pulse Arrival Time Difference (PATD) and blood pressure, but in the technology, a subject needs to wear multiple sensors, the requirement on time synchronization is high, and the measurement difficulty is increased.
(3) Pulse wave characteristic parameters: namely, a mapping model of pulse wave characteristic parameters and blood pressure is established, the processing of data in the form is complex, and the characteristic points are difficult to extract. But only need a path of PPG signal, equipment is small, is fit for developing into low-power consumption wearable equipment and realizes family's blood pressure self-checking.
For the detection of the PPG signal described above, it mainly takes the following two forms: (1) a transmission type: the device is required to emit higher light intensity, and the detection effect on thinner body parts is good; (2) a reflection type: in a thin body part, the same signal quality can be obtained by low light intensity, the detection position is not limited, and the power consumption is effectively reduced.
In the existing simpler dynamic blood pressure detection equipment, a reflective PPG acquisition part is usually a light source and two receivers, that is, light emitted by one light source is acquired by two receivers at the same time, and a PATD is calculated by using two paths of PPG signals, so that a blood pressure value is inverted. However, in order to avoid confusion of receiving two PPG signals, the distance between the two receivers needs to be set to be long, so that the size of the dynamic blood pressure detection device is increased, and inconvenience is brought to the user.
Disclosure of Invention
In view of this, the embodiment of the present disclosure provides a dynamic blood pressure detecting apparatus and a pulse wave feature extracting apparatus, so as to solve the following problems in the prior art: in order to avoid confusion of two PPG signal receptions, the distance between two receivers needs to be set to be long, so that the size of the dynamic blood pressure detection equipment is increased, and inconvenience is brought to the use of a user.
In one aspect, an embodiment of the present disclosure provides a dynamic blood pressure detecting apparatus, including: a light emitting part configured to alternately emit light having different wavelengths at predetermined time intervals; a receiver configured to acquire a first PPG signal corresponding to light of a first wavelength and a second PPG signal corresponding to light of a second wavelength; a processor configured to extract pulse wave characteristic parameters in the first and second PPG signals, respectively, to obtain first pulse wave characteristic parameters satisfying a first predetermined condition; and measuring the dynamic blood pressure value of the tested user according to the first pulse wave characteristic parameter and a preset dynamic blood pressure detection model of the tested user.
In some embodiments, the light emitting part includes: a first light source configured to emit light of the first wavelength; a second light source configured to emit light of the second wavelength; a controller configured to control the first light source and the second light source to alternately emit light at a predetermined time interval.
In some embodiments, the receiver is specifically configured to convert the received reflected light signal of the first light source into the first PPG signal and to convert the received reflected light signal of the second light source into the second PPG signal.
In some embodiments, the first light source is disposed adjacent to the second light source.
In some embodiments, the processor is further configured to establish a predetermined dynamic blood pressure detection model of the user under test according to the following process: respectively extracting pulse wave characteristic parameters in the first PPG signal and the second PPG signal to obtain a second pulse wave characteristic parameter meeting a second preset condition; and establishing the preset dynamic blood pressure detection model according to the second pulse wave characteristic parameter, the blood pressure true value of the user and a preset algorithm.
In some embodiments, further comprising: and the memory is configured to store the established dynamic blood pressure monitoring model and the measured dynamic blood pressure value.
In some embodiments, the processor is further configured to: responding to the selection operation of the user, calling the established dynamic blood pressure detection model corresponding to the selection operation, and measuring the dynamic blood pressure value of the user corresponding to the selection operation according to the called dynamic blood pressure detection model.
In some embodiments, an alarm is further included; the processor further configured to detect whether the dynamic blood pressure value is within a predetermined safety range; the alarm is configured to send out first alarm information when the dynamic blood pressure value is not in the preset safety range.
In some embodiments, further comprising: the communication device is configured to upload the user information of the tested user and the measured dynamic blood pressure value to a preset server; and/or the monitoring terminal is further configured to upload second alarm information to the predetermined server side when the dynamic blood pressure value is not within a predetermined safety range.
On the other hand, the embodiment of the present disclosure provides a pulse wave feature extraction device, including: a light emitting part configured to alternately emit light having different wavelengths at predetermined time intervals; a receiver configured to acquire a first PPG signal corresponding to light of a first wavelength and a second PPG signal corresponding to light of a second wavelength; a processor configured to extract pulse wave characteristic parameters in the first and second PPG signals, respectively, to obtain a first pulse wave characteristic parameter satisfying a first predetermined condition.
The embodiment of the disclosure adopts the light emitting component to alternately emit light with different wavelengths according to a preset time interval, so that the receiver can acquire two PPG signals, and can extract pulse wave characteristic parameters from each PPG signal, so that the pulse wave characteristic parameters are used as input, and the dynamic blood pressure value of the user to be detected is measured through a preset dynamic blood pressure detection model. The dynamic blood pressure detection equipment of the embodiment of the disclosure distinguishes two paths of reflected lights through the wavelength of the light source, so that only one receiver is needed, the size of the dynamic blood pressure detection equipment is greatly reduced, the dynamic blood pressure detection equipment is convenient for a user to wear, and the use experience of the user is improved.
Drawings
In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments described in the present disclosure, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a dynamic blood pressure detecting apparatus according to a first embodiment of the present disclosure;
FIG. 2 is a schematic diagram of the operation of a dynamic blood pressure monitor having two light sources according to a first embodiment of the present disclosure;
fig. 3 is a schematic diagram illustrating a PPG signal waveform analysis provided in the first embodiment of the present disclosure.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be described below clearly and completely with reference to the accompanying drawings of the embodiments of the present disclosure. It is to be understood that the described embodiments are only a few embodiments of the present disclosure, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the disclosure without any inventive step, are within the scope of protection of the disclosure.
Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
To maintain the following description of the embodiments of the present disclosure clear and concise, a detailed description of known functions and known components have been omitted from the present disclosure.
A first embodiment of the present disclosure provides a dynamic blood pressure detecting apparatus, a structural schematic of which is shown in fig. 1, including:
a light emitting part 1 configured to control a light source to alternately emit light having different wavelengths at predetermined time intervals;
a receiver 2 configured to acquire a first PPG signal corresponding to light of a first wavelength and a second PPG signal corresponding to light of a second wavelength;
a processor 3, coupled to the receiver 2, configured to extract pulse wave characteristic parameters in the first PPG signal and the second PPG signal, respectively, to obtain a first pulse wave characteristic parameter satisfying a first predetermined condition; and measuring the dynamic blood pressure value of the tested user according to the first pulse wave characteristic parameter and a preset dynamic blood pressure detection model of the tested user.
Fig. 1 shows the coupling relationship of each component in the form of a block diagram, and when actually set, the positional relationship of each component may be adjusted according to an actual design, and fig. 1 is only a schematic layout and does not constitute a limitation.
The light emitting part may specifically include: a first light source 11 configured to emit light having a first wavelength; a second light source 12 configured to emit light having a second wavelength; and a controller 13 coupled to the first light source 11 and the second light source 12, and configured to control the first light source and the second light source to alternately emit light at predetermined time intervals. Fig. 2 shows a schematic working principle of the ambulatory blood pressure detecting apparatus having two light sources, in which the first light source and the second light source alternately emit light, and the reflected light is obtained after the light reaches the measured object, so that the receiver obtains the first PPG signal and the second PPG signal.
Because the first light source and the second light source emit light with different wavelengths, the first light source and the second light source can be arranged closer to each other, so that the overall size of the dynamic blood pressure detection device is reduced, and the dynamic blood pressure detection device is convenient for a user to wear. In order to further reduce the size of the dynamic blood pressure detection device, the first light source and the second light source are arranged adjacently and are arranged at the same position as much as possible.
Based on the above arrangement, the receiver may be specifically configured to convert the received reflected light signal of the first light source into a first PPG signal and the received reflected light signal of the second light source into a second PPG signal. The above process is a photoelectric conversion process, that is, an optical signal is converted into an electrical signal.
The predetermined time interval needs to be set very short, and the shorter the predetermined time interval is set, the more accurate the pulse wave characteristic parameter is subsequently extracted, and in a preferred embodiment, the predetermined time interval may be set to 0.
For the receiver, the two existing receivers are adjusted into one receiver in the embodiment of the disclosure, because the light emitted by the embodiment of the disclosure has different wavelengths, the light emission interval time of the two paths of light with different wavelengths is very short, and the pulsatility change of blood flowing through the arteriole, the capillary vessel and the venule in the peripheral blood vessel is almost unchanged, one receiver can acquire the two paths of PPG signals, and the effect that the two existing receivers can achieve is achieved.
When the processor performs data processing specifically, since the embodiment of the present disclosure employs two light sources and one receiver, the PATD is not calculated, but pulse wave characteristic parameters are extracted from the PPG signal. Due to the existence of the two PPG signals, when pulse wave feature parameters are extracted, the pulse wave feature parameters of the two PPG signals can be extracted, and then a first pulse wave feature parameter meeting a first preset condition is determined from all the pulse wave feature parameters. For example, seven pulse wave characteristic parameters are respectively extracted from the first PPG signal and the second PPG signal, the first predetermined condition may be an average value of each pulse wave characteristic parameter, the first predetermined condition may also be a higher value of the pulse wave characteristic parameters in the two sets of pulse wave characteristic parameters, and a person skilled in the art may set the first predetermined condition according to actual requirements.
The embodiment of the disclosure adopts the light emitting component to alternately emit light with different wavelengths according to a preset time interval, so that the receiver can acquire two PPG signals, and can extract pulse wave characteristic parameters from each PPG signal, so that the pulse wave characteristic parameters are used as input, and the dynamic blood pressure value of the user to be detected is measured through a preset dynamic blood pressure detection model. The dynamic blood pressure detection equipment of the embodiment of the disclosure distinguishes two paths of reflected lights through the wavelength of the light source, so that only one receiver is needed, the size of the dynamic blood pressure detection equipment is greatly reduced, the dynamic blood pressure detection equipment is convenient for a user to wear, and the use experience of the user is improved.
When a user uses the dynamic blood pressure detection device initially, a dynamic blood pressure detection model belonging to the user needs to be established, and then the user can accurately measure the dynamic blood pressure value of the user. The processor is further configured to establish a predetermined ambulatory blood pressure detection model for the user under test according to the following procedure: respectively extracting pulse wave characteristic parameters in the first PPG signal and the second PPG signal to obtain a second pulse wave characteristic parameter meeting a second preset condition; and establishing a preset dynamic blood pressure detection model according to the second pulse wave characteristic parameter, the blood pressure true value of the user and a preset algorithm. The second predetermined condition may be the same as the first predetermined condition, or may be different from the first predetermined condition, and those skilled in the art may set the second predetermined condition according to actual requirements.
The first and second PPG signals mentioned above are also reflected light signals of the light emitted by the light emitting component. The second pulse wave characteristic parameter is obtained, and simultaneously, the current blood pressure true value of the user needs to be measured through the mercury sphygmomanometer, and then the blood pressure true value and the second pulse wave characteristic parameter are used as the output and the input of a preset algorithm, and relevant variable parameters of a preset dynamic blood pressure detection model are adjusted. The preset dynamic blood pressure detection model is trained by using the second pulse wave characteristic parameters and the blood pressure true values for multiple times, so that a preset dynamic blood pressure detection model belonging to a user is obtained, and the dynamic blood pressure value of the user is measured by using the preset dynamic blood pressure detection model.
The above dynamic blood pressure detection device may further include a memory configured to store the established dynamic blood pressure monitoring model and the measured dynamic blood pressure value. If it is desired that a plurality of users can use one blood pressure measuring device together, the memory provides the necessary support for the realization of the function, and the memory can store the blood pressure monitoring models respectively corresponding to different users. The above-mentioned stored dynamic blood pressure value can be used as the comparison basis for judging the subsequent health condition, and of course, also can be used for other purposes.
To enable multiple users to use one ambulatory blood pressure measurement device in common, the processor is further configured to: and responding to the selection operation of the user, calling the dynamic blood pressure detection model established by the selection operation corresponding to the user, and measuring the dynamic blood pressure value of the selection operation corresponding to the user according to the called dynamic blood pressure detection model. Through the setting, the function that a plurality of users commonly use one dynamic blood pressure measuring device is completely realized, the utilization rate of the device is improved, and the family expenditure is saved.
The dynamic blood pressure measuring device can also comprise an alarm which is matched with the processor for use. In particular, the processor is further configured to detect whether the dynamic blood pressure value is within a predetermined safety range; the alarm is configured to send out first alarm information when the dynamic blood pressure value is not in a preset safety range. The first warning information can remind the user through the indicating lamp, can also remind the user through the warning sound, and can also remind the user through the warning modes such as presenting characters or pictures.
In order to realize the function of reminding the user in a text or picture alarm manner, the dynamic blood pressure detection equipment can also comprise a communication device which is configured to upload the user information of the detected user and the measured dynamic blood pressure value to a preset server; the monitoring system can be further configured to upload second alarm information to a predetermined server side when the dynamic blood pressure value is not in the predetermined safety range. In a specific implementation, the second warning information may be the same as the first warning information, for example, when the first warning information is text information, the second warning information may be the same text, or the second warning information may be information derived from the first warning information, for example, when the first warning information is a message that reminds a user through an indicator light, the second warning information may be a text warning.
The above dynamic blood pressure detecting apparatus may further include a display configured to display at least the measured dynamic blood pressure value, and of course, may also display any information related to the dynamic blood pressure value, such as the above first warning information.
The dynamic blood pressure detecting device is described below with reference to the accompanying drawings and the detailed description.
The embodiment of the disclosure realizes dynamic blood pressure detection by extracting pulse wave characteristic parameters acquired in a reflection mode, but the pulse wave characteristic parameters acquired by the reflection mode technology are seriously influenced by the following factors, such as motion artifact, noise, low perfusion degree, ambient light and the like.
In order to solve the problem, the dynamic blood pressure detection device of the embodiment of the disclosure adopts two paths of PPG signals, the wavelengths of the two light sources are 550nm and 660nm respectively, and the corresponding colors are green and red. The existing product or patent adopts two paths of PPG signals to detect blood pressure, and the two paths of PPG signals are utilized to calculate the PATD so as to reverse the dynamic blood pressure value, the distance between the two receivers is far, and the method explained by the patent can effectively avoid the requirement, thereby reducing the size of equipment and simultaneously reducing the complexity of the equipment.
The two light sources emit light rapidly and alternately, can be regarded as two PPG signals which are acquired simultaneously on the whole, and pulse wave characteristic parameters are respectively extracted from the two PPG signals. Fig. 3 is a schematic diagram illustrating PPG signal waveform analysis, where the pulse wave characteristic parameters include, but are not limited to, systolic time ratio (ratio of time from a first valley to a peak to time of a whole pulse cycle), diastolic time ratio (ratio of time from a peak to a second valley to time of a whole pulse cycle), relative height of a central isthmus, relative height of a dicrotic wave, a rising area (area from a starting point to a main broadcasting point), a falling area (area from a main broadcasting point to a next wave starting point), and a total area.
Because the PPG signals formed by the two paths of light only have difference in amplitude, namely the time parameter should be the same, and the amplitude and the surface parameter should be proportional, the effectiveness of the extracted pulse wave characteristic parameter can be judged by taking the difference as a measurement standard. If the pulse wave characteristic parameters meet the corresponding conditions of the time, the amplitude, the surface parameters and the like, the extracted pulse wave characteristic parameters are determined to be valid data, the two groups of pulse wave characteristic parameters are correspondingly averaged, a dynamic blood pressure detection model is established by using blood pressure true values detected by the averaged pulse wave characteristic parameters and the mercury sphygmomanometer at the same time, and the establishment method of the dynamic blood pressure detection model comprises but is not limited to BPNN, KNN, SVM and the like. The process of establishing the dynamic blood pressure detection model by using the pulse wave characteristic parameters and the blood pressure true values is the same as that of the prior art, and persons skilled in the art can refer to the prior art, which is not described herein again.
The above process is a process of how to establish a personal dynamic blood pressure detection model, and the following is a general description of each functional module of the dynamic blood pressure detection device. The dynamic blood pressure detection device of the embodiment of the present disclosure may include the following modules:
(1) the dynamic blood pressure acquisition module (namely, the PPG signal acquisition process is realized, which is equivalent to the functions of the luminous component and the receiver): PPG feature extraction detection as above. The module can be split into the following aspects:
a photoelectric conversion unit: the method is used for realizing the processes of filtering clutter, amplifying, analog-to-digital conversion, mathematical operation and the like on the signals.
A device control unit: for controlling the detecting device to periodically collect the blood pressure data of the user at a fixed time interval. The fixed time interval can be implemented as a fixed time interval detection mode, for example, detection is performed once every four hours, or the detection frequency is intelligently increased or decreased according to the detection result, for example, if the blood pressure is detected to continuously rise or fall or is kept at an excessively high or excessively low level, the detection frequency is appropriately increased, for example, detection is performed once an hour, and the detection frequency is reduced after the blood pressure is recovered to be normal.
(2) A power supply module: the dynamic blood pressure detection equipment can work normally. The power display may be provided through a human interface.
(3) Man-machine interface module (equivalent to realize the functions of alarm and display): the intelligent medical instrument comprises keys, a display screen, an indicator light and the like, wherein when the condition of an illness of a user is serious, the keys can utilize a communication module to make a appointment for a doctor in a hospital or inquire whether the user decides to conduct online guidance, and the indicator light displays overhigh (red), overlow (yellow) and normal (green) blood pressure through color difference.
(4) Communication module (equivalent to the function of the communication device): the system comprises the functions of mobile communication, WiFi, Bluetooth and the like, and is at least used for interacting information between the dynamic blood pressure detection equipment and a client side, and information between a cloud side and the client side (an intelligent mobile terminal and a doctor remote side).
(5) Data processing module (equivalent to implementing the functions of the processor): the device is used for processing the data collected by the detection equipment. The function of the module can be completed on the dynamic blood pressure detection equipment and also can be completed on a cloud platform. The module can be split into the following aspects:
a model establishing unit: and (3) screening a calculation model with high detection precision, small complexity and short detection time.
A data conversion unit: and converting the original data into sampling data meeting requirements, such as down sampling and interpolation.
A database establishing unit: and establishing a personal dynamic blood pressure database to realize multi-person detection of the same equipment.
An alarm reminding unit: setting blood pressure early warning threshold values for different users, comparing the detected values with the blood pressure early warning threshold values to warn in time, and pushing registration/on-line inquiry demands.
If the data processing module is arranged on the cloud platform, the device control unit of the dynamic blood pressure acquisition module can also be transferred to the cloud platform, so that the detection frequency can be evaluated by doctors/A workers, and the dynamic blood pressure monitoring interactivity is improved.
(6) Data storage module (equivalent to implementing the function of memory): for storing various data.
The module can be split into the following aspects:
personal blood pressure database: the dynamic blood pressure information of a plurality of users is stored, and each dynamic blood pressure information comprises sampling data and output data.
The dynamic blood pressure information in the personal blood pressure database can establish a file group for blood pressure data according to factors such as gender, age, blood relationship and the like, the personal blood pressure database is used for evaluating blood pressure change influence factors, blood pressure early warning is finally realized, people possibly with blood pressure problems are predicted and reminded, and the academic value of the database is improved.
The data receiving terminal of the dynamic blood pressure detection device is simultaneously connected with the inflatable mercury sphygmomanometer, when a result is transmitted, the data are automatically matched with the data measured by the dynamic blood pressure detection device, if a human body is in a state of rest without emotional fluctuation and the time interval between the detection result of the mercury sphygmomanometer and the data measured by the dynamic blood pressure detection device is not more than 30 minutes, the default matching is successful, the data measured by the dynamic blood pressure detection device are marked, the correlation between the sample and the existing sample is evaluated, and if the difference is large, the pulse wave characteristic parameter, the dynamic blood pressure value and the result of the mercury sphygmomanometer, which are obtained by the sample based on PPG signals, are merged and stored in a training set, so that the data are used when the blood pressure calculation model is optimized and updated.
According to the dynamic blood pressure detection device and the dynamic blood pressure detection method, the problem that the existing dynamic blood pressure detection device based on the optical plethysmography is only suitable for a single person is effectively solved through establishing the personal blood pressure database through the data storage module, and the cost performance of the device is improved.
A second embodiment of the present disclosure provides a pulse wave feature extraction device, which may be used in various scenarios requiring extraction of pulse wave feature parameters, and may include:
a light emitting part configured to alternately emit light having different wavelengths at predetermined time intervals;
a receiver configured to acquire a first PPG signal corresponding to light of a first wavelength and a second PPG signal corresponding to light of a second wavelength;
a processor configured to extract pulse wave characteristic parameters in the first and second PPG signals, respectively, to obtain a first pulse wave characteristic parameter satisfying a first predetermined condition.
The light emitting part may specifically include: a first light source configured to emit light of a first wavelength; a second light source configured to emit light of a second wavelength; a controller configured to control the first light source and the second light source to alternately emit light at predetermined time intervals.
When the device works, the first light source and the second light source alternately emit light, reflected light is obtained after the light reaches a detected body, and then the receiver obtains a first PPG signal and a second PPG signal.
Because the first light source and the second light source emit light with different wavelengths, the first light source and the second light source can be arranged closer to each other, so that the overall size of the dynamic blood pressure detection device is reduced, and the dynamic blood pressure detection device is convenient for a user to wear. In order to further reduce the size of the dynamic blood pressure detection device, the first light source and the second light source are arranged adjacently and are arranged at the same position as much as possible.
Based on the above arrangement, the receiver may be specifically configured to convert the received reflected light signal of the first light source into a first PPG signal and the received reflected light signal of the second light source into a second PPG signal. The above process is a photoelectric conversion process, that is, an optical signal is converted into an electrical signal.
The predetermined time interval needs to be set very short, and the shorter the predetermined time interval is set, the more accurate the pulse wave characteristic parameter is subsequently extracted, and in a preferred embodiment, the predetermined time interval may be set to 0.
For the receiver, the two existing receivers are adjusted into one receiver in the embodiment of the disclosure, because the light emitted by the embodiment of the disclosure has different wavelengths, the light emission interval time of the two paths of light with different wavelengths is very short, and the pulsatility change of blood flowing through the arteriole, the capillary vessel and the venule in the peripheral blood vessel is almost unchanged, one receiver can acquire the two paths of PPG signals, and the effect that the two existing receivers can achieve is achieved.
When pulse wave feature parameters are extracted, the pulse wave feature parameters of the two PPG signals can be extracted, and then a first pulse wave feature parameter meeting a first preset condition is determined from all the pulse wave feature parameters. For example, seven pulse wave characteristic parameters are respectively extracted from the first PPG signal and the second PPG signal, the first predetermined condition may be an average value of each pulse wave characteristic parameter, the first predetermined condition may also be a higher value of the pulse wave characteristic parameters in the two sets of pulse wave characteristic parameters, and a person skilled in the art may set the first predetermined condition according to actual requirements.
The light emitting component can alternately emit light with different wavelengths according to a preset time interval, the receiver can acquire two PPG signals, pulse wave characteristic parameters can be extracted from each PPG signal, and the pulse wave characteristic parameters can be used for constructing a dynamic blood pressure detection model or used by a person skilled in the art when the pulse wave characteristic parameters are required. The dynamic blood pressure detection device of the embodiment of the disclosure distinguishes two paths of reflected light through the wavelength of the light source, so that only one receiver is needed, and the size of the device is greatly reduced.
Moreover, although exemplary embodiments have been described herein, the scope thereof includes any and all embodiments based on the disclosure with equivalent elements, modifications, omissions, combinations (e.g., of various embodiments across), adaptations or alterations. The elements of the claims are to be interpreted broadly based on the language employed in the claims and not limited to examples described in the present specification or during the prosecution of the application, which examples are to be construed as non-exclusive. It is intended, therefore, that the specification and examples be considered as exemplary only, with a true scope and spirit being indicated by the following claims and their full scope of equivalents.
The above description is intended to be illustrative and not restrictive. For example, the above-described examples (or one or more versions thereof) may be used in combination with each other. For example, other embodiments may be used by those of ordinary skill in the art upon reading the above description. In addition, in the foregoing detailed description, various features may be grouped together to streamline the disclosure. This should not be interpreted as an intention that a disclosed feature not claimed is essential to any claim. Rather, the subject matter of the present disclosure may lie in less than all features of a particular disclosed embodiment. Thus, the following claims are hereby incorporated into the detailed description as examples or embodiments, with each claim standing on its own as a separate embodiment, and it is contemplated that these embodiments may be combined with each other in various combinations or permutations. The scope of the disclosure should be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled.
While the present disclosure has been described in detail with reference to the embodiments, the present disclosure is not limited to the specific embodiments, and those skilled in the art can make various modifications and alterations based on the concept of the present disclosure, and the modifications and alterations should fall within the scope of the present disclosure as claimed.
Claims (10)
1. An ambulatory blood pressure device, comprising:
a light emitting part configured to alternately emit light having different wavelengths at predetermined time intervals;
a receiver configured to acquire a first PPG signal corresponding to light of a first wavelength and a second PPG signal corresponding to light of a second wavelength;
a processor configured to extract pulse wave characteristic parameters in the first and second PPG signals, respectively, to obtain first pulse wave characteristic parameters satisfying a first predetermined condition; and measuring the dynamic blood pressure value of the tested user according to the first pulse wave characteristic parameter and a preset dynamic blood pressure detection model of the tested user.
2. The dynamic blood pressure detecting apparatus according to claim 1, wherein the light emitting section includes:
a first light source configured to emit light of the first wavelength;
a second light source configured to emit light of the second wavelength;
a controller configured to control the first light source and the second light source to alternately emit light at a predetermined time interval.
3. The dynamic blood pressure detecting device according to claim 2,
the receiver is specifically configured to convert the received reflected light signal of the first light source into the first PPG signal and to convert the received reflected light signal of the second light source into the second PPG signal.
4. The dynamic blood pressure detecting device according to claim 2, wherein the first light source is disposed adjacent to the second light source.
5. The ambulatory blood pressure device of claim 1 wherein said processor is further configured to establish a predetermined ambulatory blood pressure test model for said user under test according to the following procedure:
respectively extracting pulse wave characteristic parameters in the first PPG signal and the second PPG signal to obtain a second pulse wave characteristic parameter meeting a second preset condition;
and establishing the preset dynamic blood pressure detection model according to the second pulse wave characteristic parameter, the blood pressure true value of the user and a preset algorithm.
6. The dynamic blood pressure monitoring device of claim 5, further comprising:
and the memory is configured to store the established dynamic blood pressure monitoring model and the measured dynamic blood pressure value.
7. The dynamic blood pressure detection device of claim 6, wherein the processor is further configured to:
responding to the selection operation of the user, calling the established dynamic blood pressure detection model corresponding to the selection operation, and measuring the dynamic blood pressure value of the user corresponding to the selection operation according to the called dynamic blood pressure detection model.
8. The dynamic blood pressure detecting device according to any of claims 1 to 7, further comprising an alarm;
the processor further configured to detect whether the dynamic blood pressure value is within a predetermined safety range;
the alarm is configured to send out first alarm information when the dynamic blood pressure value is not in the preset safety range.
9. The dynamic blood pressure detection device according to any one of claims 1 to 7, further comprising:
the communication device is configured to upload the user information of the tested user and the measured dynamic blood pressure value to a preset server; and/or the monitoring terminal is further configured to upload second alarm information to the predetermined server side when the dynamic blood pressure value is not within a predetermined safety range.
10. A pulse wave feature extraction device characterized by comprising:
a light emitting part configured to alternately emit light having different wavelengths at predetermined time intervals;
a receiver configured to acquire a first PPG signal corresponding to light of a first wavelength and a second PPG signal corresponding to light of a second wavelength;
a processor configured to extract pulse wave characteristic parameters in the first and second PPG signals, respectively, to obtain a first pulse wave characteristic parameter satisfying a first predetermined condition.
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