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WO2017092020A1 - 一种血压测量方法及装置 - Google Patents

一种血压测量方法及装置 Download PDF

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Publication number
WO2017092020A1
WO2017092020A1 PCT/CN2015/096366 CN2015096366W WO2017092020A1 WO 2017092020 A1 WO2017092020 A1 WO 2017092020A1 CN 2015096366 W CN2015096366 W CN 2015096366W WO 2017092020 A1 WO2017092020 A1 WO 2017092020A1
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Prior art keywords
ppg
blood pressure
signal
ptt
duration
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English (en)
French (fr)
Inventor
黄邦宇
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to PCT/CN2015/096366 priority Critical patent/WO2017092020A1/zh
Priority to CN201580072294.1A priority patent/CN107106055B/zh
Publication of WO2017092020A1 publication Critical patent/WO2017092020A1/zh
Anticipated expiration legal-status Critical
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/02—Detecting, measuring or recording for evaluating the cardiovascular system, e.g. pulse, heart rate, blood pressure or blood flow
    • A61B5/021—Measuring pressure in heart or blood vessels

Definitions

  • Hypertension is the most common type of cardiovascular disease. This disease is getting more and more attention and attention. Blood pressure measurement has become an indispensable means for effective monitoring of hypertension.
  • the indirect blood pressure measurement method indirectly obtains blood pressure data such as arterial systolic pressure and arterial diastolic pressure by detecting parameters such as pulsation of the arterial wall and changes in blood vessel volume.
  • Oscillometric Method Another commonly used indirect measurement method for blood pressure is the Oscillometric Method, which uses a cuff to block arterial blood flow. During slow deflation, it detects the pulsating oscillation wave envelope from the blood vessel wall and finds out The inherent relationship between the envelope and arterial blood pressure, in turn, blood pressure data. This method is also widely used in various clinical electronic blood pressure monitors.
  • the method of obtaining blood pressure information using PTT estimation requires the ECG signal. If the ECG lead method used is a limb lead, it may easily occur due to poor contact of the limb, or the ECG electrode may fall off after a long period of non-contact. The ECG signal was not available, which made it impossible to measure blood pressure.
  • ECG average blood pressure of the population
  • SBP+DBP diastolic blood pressure
  • the amplitude of heart rate variability under respiratory regulation it is proposed to use ECG to measure blood pressure.
  • the heart rate variation amplitude can be obtained by collecting the ECG signal
  • the average blood pressure can be obtained by using the relationship between the average blood pressure of the population and the heart rate variation amplitude.
  • obtaining blood pressure information in this way also requires collecting ECG signals, which causes the same problem as the above PTT calculation method for obtaining blood pressure.
  • the ECG signal cannot be obtained due to poor contact or electrode peeling, resulting in inaccurate measurement. blood pressure.
  • Embodiments of the present invention provide a blood pressure measuring method and apparatus for overcoming the problem that the ECG signal cannot be obtained due to poor contact or electrode detachment, so that blood pressure cannot be accurately measured.
  • a blood pressure measurement method includes:
  • the PTT acquisition duration is greater than or equal to a preset PTT effective duration, acquiring the blood pressure measurement value of the user based on the PTT blood pressure calculation model;
  • the PPG acquisition duration refers to a duration in which the signal quality of the PPG signal meets the second preset condition
  • the method further includes:
  • the ECG acquisition duration is obtained, where the ECG acquisition duration refers to the signal quality of the ECG signal satisfies the first The length of the preset condition;
  • the blood pressure measurement value of the user is acquired based on the ECG blood pressure calculation model.
  • the blood pressure measurement value of the user is obtained based on a PPG blood pressure calculation model, and specifically includes:
  • the PPG signal characteristic value corresponding to the collected PPG signal is substituted into the PPG blood pressure calculation model, and the blood pressure measurement value of the user is calculated.
  • the first preset condition is that a lead connection state of the ECG signal is a normal connection state and a signal-to-noise ratio of the ECG signal is less than or equal to a first threshold, or a lead connection state of the ECG signal is a normal connection state and an invalid feature point in the ECG signal accounts for a total of feature points The ratio is less than or equal to the second threshold, or the lead connection state of the ECG signal is a normal connection state and the ECG signal continuously acquires a vertex position of the ECG R wave.
  • the second preset condition is that a signal to noise ratio of the PPG signal is less than or equal to a third threshold, or an invalid feature point in the PPG signal is occupied by a total of feature points. The ratio is less than or equal to the fourth threshold.
  • a blood pressure measuring device includes:
  • ECG signal acquisition circuit for collecting the ECG signal of the user
  • a PPG signal acquisition circuit for collecting the PPG signal of the user
  • a processor for obtaining a PTT acquisition duration, where the PTT acquisition duration refers to a duration in which the signal quality of the ECG signal satisfies a first preset condition and the signal quality of the PPG signal simultaneously satisfies a second preset condition;
  • the PTT acquisition duration is greater than or equal to a preset PTT effective duration, acquiring the blood pressure measurement value of the user based on the PTT blood pressure calculation model;
  • the PPG acquisition duration refers to a duration in which the signal quality of the PPG signal meets the second preset condition
  • the PPG acquisition duration is greater than or equal to a preset PPG effective duration, acquiring the blood pressure measurement value of the user based on the PPG blood pressure calculation model;
  • a display module is configured to display the blood pressure measurement value of the user.
  • the processor is further configured to:
  • the ECG acquisition duration is obtained, where the ECG acquisition duration refers to the signal quality of the ECG signal satisfies the first The length of the preset condition;
  • the blood pressure measurement value of the user is acquired based on the ECG blood pressure calculation model.
  • the processor acquires the blood pressure measurement value of the user based on the PPG blood pressure calculation model, specifically:
  • the PPG signal characteristic value corresponding to the collected PPG signal is substituted into the PPG blood pressure calculation model, and the blood pressure measurement value of the user is calculated.
  • the first preset condition is a lead connection state of the ECG signal a normal connection state and a signal-to-noise ratio of the ECG signal is less than or equal to a first threshold, or a lead connection state of the ECG signal is a normal connection state and invalid feature points in the ECG signal are in a total feature point The ratio is less than or equal to the second threshold, or the lead connection state of the ECG signal is a normal connection state and the ECG signal continuously acquires a vertex position of the ECG R wave.
  • the second preset condition is that the signal to noise ratio of the PPG signal is less than or It is equal to the third threshold, or the proportion of the invalid feature points in the PPG signal in the total feature points is less than or equal to the fourth threshold.
  • the method of the embodiment of the present invention is used to collect the ECG signal and the PPG signal of the user; and the acquisition time length of the PTT is acquired, and the PTT acquisition duration refers to the signal quality of the ECG signal that satisfies the first preset condition and the signal of the PPG signal.
  • the quality meets the duration of the second preset condition at the same time; if it is determined that the PTT acquisition duration is greater than or equal to the preset PTT effective duration, the user's blood pressure measurement value is obtained based on the PTT blood pressure calculation model; if it is determined that the PTT acquisition duration is less than the preset PTT
  • the effective duration is the length of the PPG acquisition.
  • the PPG acquisition duration refers to the duration of the PPG signal's signal quality that meets the second preset condition. If the PPG acquisition duration is greater than or equal to the preset PPG effective duration, the PPG blood pressure calculation model is used to obtain the user. Blood pressure measurement. Therefore, the method of the embodiment of the present invention can improve the user experience, and the user's blood pressure measurement value can be obtained even if the ECG signal is poorly contacted or the electrode is detached, thereby improving the efficiency of the blood pressure measurement.
  • FIG. 1 is a flow chart showing an overview of a blood pressure measuring method according to an embodiment of the present invention
  • FIG. 2 is a specific flowchart of user A measuring blood pressure according to an embodiment of the present invention
  • FIG. 3 is a schematic structural view of a blood pressure measuring device according to an embodiment of the present invention.
  • Embodiments of the present invention provide a method and a device for measuring blood pressure, which are used to overcome the situation in which the electrode is detached and the ECG signal is not acquired, thereby making it impossible to perform blood pressure measurement.
  • the method and the device are based on the same inventive concept. Since the principles of the method and the device for solving the problem are similar, the implementation of the device and the method can be referred to each other, and the repeated description is not repeated.
  • an embodiment of the present invention provides a blood pressure measurement method, and the specific process includes:
  • Step 110 Collect the ECG signal and the PPG signal of the user.
  • the user turns on the blood pressure measuring device, and gives a blood pressure measurement opening instruction, and when the blood pressure measuring device receives the blood pressure measurement opening command, starts collecting the user's ECG signal and the PPG signal;
  • the blood pressure measuring device determines that the time when the lead connection state of the collected user ECG signal is in the normal connection state exceeds the first duration, the user may be prompted to determine whether to open the blood pressure measurement. If the user chooses to turn on the blood pressure measurement, the blood pressure measuring device starts measuring the user's blood pressure based on the received blood pressure measurement opening command.
  • the first duration here is a preset value, for example 10s.
  • the blood pressure measurement can be automatically started.
  • the blood pressure measurement device may not be automatically caused by the user's accidental collision. Start blood pressure measurement.
  • Step 120 Obtain a PTT acquisition duration.
  • the PTT acquisition duration refers to a duration in which the signal quality of the ECG signal satisfies the first preset condition and the signal quality of the PPG signal simultaneously satisfies the second preset condition.
  • the blood pressure measuring device collects the ECG signal and the PPG signal, it is necessary to separately judge the signal quality of the two signals.
  • the second preset condition herein may be that the signal to noise ratio of the PPG signal is less than or equal to the third threshold, or the proportion of the invalid feature points in the PPG signal is less than or equal to the total feature point. Equal to the fourth threshold and so on.
  • the duration of the PPG signal with the signal-to-noise ratio less than or equal to the third threshold may be used as the PPG acquisition duration, or the duration of the invalid feature point in the PPG signal in the total feature point is less than or equal to the third threshold. As the PPG acquisition duration.
  • the ECG signal When judging the signal quality of the ECG signal, it is first determined whether the lead connection state of the ECG signal is normal. If the lead is detached, it is directly determined that the ECG signal is unavailable, and if the lead connection state of the ECG signal is the normal connection state, then further Judging the quality of the ECG signal, similarly, the ECG signal can also be used to judge the signal quality.
  • the first preset condition herein may be that the lead connection state of the ECG signal is a normal connection state and the signal-to-noise ratio of the ECG signal is less than or equal to the first threshold value as the ECG acquisition duration, or the lead of the ECG signal.
  • connection state is the normal connection state and the duration of the invalid feature points in the ECG signal in the total feature points is less than or equal to the second threshold as the ECG acquisition duration.
  • the vertex position of the ECG R wave can be continuously acquired as the first preset condition.
  • the R wave can be identified by a threshold detection method. Therefore, it is also possible to set the lead connection state of the ECG signal to the normal connection state and the ECG signal continuously acquires the duration of the vertex position of the ECG R wave as the ECG acquisition duration.
  • the method for judging the signal quality is not limited to the above, and various methods for judging the signal quality are provided in the prior art, and details are not described herein again.
  • the signal quality of the ECG signal satisfies the first preset condition and the signal quality of the PPG signal simultaneously satisfies the second preset condition as the PTT acquisition duration.
  • Step 130 If it is determined that the PTT acquisition duration is greater than or equal to the preset PTT effective duration, the user's blood pressure measurement is obtained based on the PTT blood pressure calculation model.
  • the preset PTT effective duration may be determined according to an empirical value.
  • the so-called PTT effective duration refers to the shortest measurement duration that the user must use the PTT blood pressure calculation model to obtain the blood pressure measurement value, and the signal quality of the ECG signal satisfies the first preset condition and the signal quality of the PPG signal satisfies at the same time.
  • Two preset conditions Specifically, in each beat cycle of the heart, the effective ECG waveform feature points and the effective PPG waveform feature points can form an effective pair, called an effective PTT pairing period.
  • the PTT effective duration consists of multiple valid PTT pairing periods.
  • the ECG waveform feature point usually refers to the R wave position
  • the PPG waveform feature point usually refers to the position of the valley, the wave top, and the maximum slope point of the rising edge.
  • the blood pressure measuring device determines that the PTT acquisition duration is greater than or equal to the preset PTT effective duration, the corresponding PTT result is calculated according to the ECG signal and the PPG signal corresponding to the PTT acquisition duration, and the obtained PTT result is substituted into the PTT blood pressure calculation model.
  • the user's blood pressure measurement is calculated, wherein the PTT blood pressure calculation model can be adopted but not limited to the following formula:
  • SBP 0 is the systolic pressure calibration value
  • DBP 0 is the diastolic pressure calibration value
  • PTT w0 is the pulse wave propagation time calibration value
  • PTTw is the current pulse wave propagation time
  • A is the preset coefficient, which is related to the elasticity of the blood vessel wall.
  • the corresponding PTT results can be calculated according to the ECG signal and the PPG signal corresponding to the PTT acquisition duration, and the obtained PTT results are substituted into the PTT blood pressure calculation model to calculate the user's blood pressure measurement values.
  • the ECG signal and the PPG signal acquired subsequently are determined.
  • the corresponding PTT is calculated, and the PTT is substituted into the PTT blood pressure calculation model to calculate the user's blood pressure measurement value.
  • the acquisition time period can be obtained.
  • the plurality of PTTs are averaged, or the PTTs within the preset range are averaged according to the distribution weights of the plurality of PTTs, and then the PTT average is substituted into the PTT blood pressure calculation model.
  • the corresponding PTT result is calculated, and the plurality of PTTs are respectively substituted into the PTT blood pressure calculation model to obtain the blood pressure value, and then the obtained plurality of blood pressure values are averaged, or According to the distribution weight of the plurality of blood pressure values, the blood pressure values distributed within the preset range are averaged as the blood pressure measurement value of the user.
  • the obtained high pressure values are five blood pressure data of 121, 122, 121, 130, and 125, and the average value of the five high pressure values is 123.8.
  • the high pressure values distributed within 80% are averaged, and the high pressure values distributed within 80% are only 121, 122, 121, and 125, and the average value is 122.25.
  • Step 140 If it is determined that the PTT acquisition duration is less than the preset PTT effective duration, the PPG acquisition duration is obtained, and the PPG acquisition duration refers to the duration of the PPG signal's signal quality meeting the second preset condition.
  • the PPG acquisition duration refers to the duration when the signal quality of the PPG signal satisfies the second preset condition.
  • Step 150 If it is determined that the PPG acquisition duration is greater than or equal to the preset PPG effective duration, the blood pressure measurement value of the user is obtained based on the PPG blood pressure calculation model.
  • the preset PPG effective duration may be determined according to an empirical value.
  • the so-called PPG effective duration refers to the shortest measurement duration that the user must take to obtain the blood pressure measurement value of the PPG blood pressure calculation model, and the signal quality of the PPG signal satisfies the second preset condition during the duration.
  • two adjacent, valid PPG waveform feature points constitute a PPG valid period.
  • the effective duration of the PPG consists of multiple valid PPG valid periods. PPG waveform feature points are commonly used for valleys, wave tops, and maximum slope points of rising edges.
  • the blood pressure measuring device determines that the PPG acquisition duration is greater than or equal to the preset PPG effective duration, the corresponding PPG signal characteristic value is determined according to the PPG signal collected during the PPG acquisition duration, and the obtained PPG signal characteristic value is substituted into the PPG blood pressure calculation model. User's blood pressure measurement.
  • the PPG blood pressure measurement model can be obtained by the following method, but is not limited to the following formula:
  • SBP 0 systolic pressure calibration value
  • DBP 0 diastolic pressure calibration value
  • PTT w0 pulse wave propagation time calibration value
  • R for collecting ECG. Wave position, R wave amplitude, PPG waveform vertex, PPG waveform bottom point, PPG waveform rising edge slope maximum point, etc.
  • b is the proportional coefficient between the difference between the two blood pressures and the height of the PPG waveform. This scale factor needs to be obtained through empirical data accumulation.
  • the PPG correlation coefficient and the collected data are brought into the PTT blood pressure calculation model, and a model for calculating blood pressure based on the PPG signal characteristic value is obtained as a PPG blood pressure calculation model.
  • the characteristic value of the PPG signal is H PPG , that is, the height of the PPG waveform
  • the PPG blood pressure calculation model is:
  • the PPG signal characteristic value corresponding to the PPG acquisition duration can be substituted into the PTT blood pressure calculation model to calculate the user's blood pressure measurement value.
  • the PPG signal collected subsequently is determined.
  • the corresponding PPG signal characteristic value is substituted into the PPG blood pressure calculation model to calculate the user's blood pressure measurement value.
  • the blood pressure measuring device determines that the PTT acquisition duration is less than the preset PTT effective duration and the PPG acquisition duration is less than the preset PPG effective duration, the ECG acquisition duration can be acquired, and the ECG acquisition duration refers to the signal quality of the ECG signal satisfies the first pre- Set the duration of the condition.
  • the blood pressure measuring device acquires the blood pressure measurement value of the user based on the ECG blood pressure calculation model if it is determined that the ECG acquisition duration is greater than or equal to the preset ECG effective duration.
  • the preset ECG effective duration here is determined based on the empirical value.
  • the so-called ECG effective duration refers to the shortest measurement duration that the ECG blood pressure calculation model is to be used to obtain the user's blood pressure measurement value, and the signal quality of the ECG signal satisfies the first preset condition during the duration.
  • two adjacent, valid ECG waveform feature points constitute an ECG valid period.
  • the effective duration of the ECG consists of multiple valid ECG valid periods.
  • the ECG waveform feature point usually refers to the R wave position.
  • the relationship between the heart rate variability and (SBP+DBP)/2 K ECG2 *RR.
  • K ECG1 and K ECG2 are the empirical coefficients obtained after a large number of people collect, and RR is the heart rate variability value, which is obtained by calculating and analyzing the ECG signal.
  • K ECG1 and K ECG2 are determined based on the information provided by the user on age, sex, weight, etc., and the SBP value and the DBP value are further calculated.
  • the blood pressure measuring device determines to obtain the blood pressure measurement value of the user based on the ECG blood pressure calculation model, if the signal quality of the PPG signal is improved, and the PTT acquisition time length is greater than or equal to the preset PTT effective time length, then the user is converted into a PTT blood pressure calculation model. Blood pressure measurement value, if the signal quality of the ECG signal is deteriorated, and the signal quality of the PPG signal is improved, and the PPG acquisition duration is greater than or equal to the preset PPG effective duration, then the blood pressure measurement value of the user is obtained based on the PPG blood pressure calculation model.
  • the blood pressure measurement based on the PPG blood pressure measurement method is higher in accuracy than the blood pressure measurement method based on the ECG, in the embodiment of the present invention, when the blood pressure measurement method based on PTT is not available, the blood pressure measurement based on the PPG can be preferentially considered. the way.
  • the PTT blood pressure measurement method may be due to poor PPG signal quality. It cannot be performed normally. For example, due to individual skin color, damage to the measurement site, weak perfusion, etc., the quality of the obtained PPG signal is poor, resulting in the inability to perform PPG feature point recognition.
  • a blood pressure based method based on ECG can be used. Further, in order to improve the quality of the PPG signal, the light intensity can be adjusted.
  • the PTT acquisition time reaches the preset PTT effective duration
  • the PTT blood pressure measurement is performed; if the PTT acquisition time is long If the preset PTT effective duration is not reached, and the PPG acquisition duration reaches the preset PPG effective duration, the PPG blood pressure measurement is used; if the PTT acquisition duration and the PPG acquisition duration have not reached the preset value, the ECG measurement mode is continued.
  • Embodiment 1 taking FIG. 2 as an example, performing blood pressure measurement for user A, specifically:
  • Step 201 User A initiates blood pressure measurement.
  • Step 202 The blood pressure measuring device collects the ECG signal and the PPG signal of the user A.
  • Step 203 The blood pressure measuring device acquires the PTT collection duration, determines whether the PTT acquisition duration is greater than or equal to the preset PTT effective duration, and if yes, executes step 204, otherwise performs step 205.
  • Step 204 The blood pressure measuring device calculates the blood pressure measurement value of the user A based on the PTT blood pressure calculation model.
  • Step 205 The blood pressure measuring device acquires the PPG acquisition duration, and determines whether the PPG acquisition duration is greater than or equal to the preset PPG effective duration. If the step 206 is performed, otherwise step 207 is performed.
  • Step 206 The blood pressure measuring device calculates the blood pressure measurement value of the user A based on the PPG blood pressure calculation model.
  • Step 207 The blood pressure measuring device acquires the ECG acquisition duration, and determines whether the ECG acquisition duration is greater than or equal to the preset ECG effective duration. If the step 208 is performed, otherwise step 209 is performed.
  • Step 208 The blood pressure measuring device calculates the blood pressure measurement value of the user A based on the ECG blood pressure calculation model.
  • Step 209 The blood pressure measuring device prompts the user A to fail the blood pressure measurement.
  • the embodiment of the present invention provides a blood pressure measuring device 30, which may be a watch, a wristband or other wearable device, or a tablet computer, etc., the device includes:
  • the ECG signal collecting circuit 31 is configured to collect an ECG signal of the user
  • the PPG signal collecting circuit 32 is configured to collect a PPG signal of the user
  • the processor 33 is configured to acquire a PTT acquisition duration, where the PTT acquisition duration refers to a duration in which the signal quality of the ECG signal satisfies a first preset condition and the signal quality of the PPG signal simultaneously satisfies a second preset condition;
  • the PTT acquisition duration is greater than or equal to a preset PTT effective duration, acquiring a blood pressure measurement value of the user based on the PTT blood pressure calculation model;
  • the PPG acquisition duration refers to the duration of the PPG signal that meets the second preset condition
  • the display module 34 is configured to display a blood pressure measurement value of the user.
  • the processor 33 is further configured to:
  • the ECG acquisition duration is obtained, where the ECG acquisition duration is that the signal quality of the ECG signal meets the first preset. The length of the condition;
  • the user's blood pressure measurement is obtained based on the ECG blood pressure calculation model.
  • the processor 33 when the processor 33 acquires the blood pressure measurement value of the user based on the PPG blood pressure calculation model, specifically, the processor 33 can be used to:
  • the PPG correlation coefficient and the collected data are brought into the PTT blood pressure calculation model, and a model for calculating blood pressure based on the PPG signal characteristic value is obtained as a PPG blood pressure calculation model;
  • the first preset condition is that the lead connection state of the ECG signal is a normal connection state and the signal to noise ratio of the ECG signal is less than or equal to the first threshold, or the lead connection state of the ECG signal is positive.
  • the normally connected state and the proportion of the invalid feature points in the ECG signal in the total feature points is less than or equal to the second threshold, or the lead connection state of the ECG signal is the normal connection state and the ECG signal continuously acquires the vertex position of the ECG R wave .
  • the second preset condition is that the signal to noise ratio of the PPG signal is less than or equal to the third threshold, or the proportion of the invalid feature points in the PPG signal in the total feature points is less than or equal to the fourth threshold.
  • the processor 33 herein may be a chip, such as a Field-Programmable Gate Array (FPGA), an Application Specific Integrated Circuit (ASIC), or a combination thereof.
  • FPGA Field-Programmable Gate Array
  • ASIC Application Specific Integrated Circuit
  • the ECG signal acquisition circuit 31, the PPG signal acquisition circuit 32, the processor 33, and the display module 34 are connected by a bus 35 in FIG. 3, and the bus is indicated by a thick line in FIG. 3, and between other components.
  • the connection method is only for illustrative purposes and is not limited.
  • the bus can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is shown in Figure 3, but it does not mean that there is only one bus or one type of bus.
  • the steps of the method provided in the embodiment of the present invention may be performed in parallel or in series, and some steps may also be implemented in a previous step.
  • the step of acquiring the PPG acquisition time is also performed. It can be obtained during the previous acquisition of the PTT acquisition duration.
  • first used only to distinguish different objects, and do not represent a particular order or a particular relationship of the numerical magnitude of the objects.
  • embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the invention can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) including computer usable program code.
  • computer-usable storage media including but not limited to disk storage, CD-ROM, optical storage, etc.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.

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Abstract

一种血压测量方法及装置（30），该方法包括采集用户的ECG信号和PPG信号（110）；获取PTT采集时长（120）；若确定PTT采集时长大于或等于预设的PTT有效时长，则基于PTT血压计算模型获取用户的血压测量值（130）；若确定PTT采集时长小于预设的PTT有效时长，获取PPG采集时长（140）；若确定PPG采集时长大于或等于预设的PPG有效时长，则基于PPG血压计算模型获取用户的血压测量值（150）。该血压测量装置（30）包括ECG信号采集电路（31），PPG信号采集电路（32），处理器（33）以及显示模块（34）。采用该血压测量装置（30）能提升血压测量的效率，即使ECG信号接触不良或电极脱落也能够获得用户的血压测量值。

Description

一种血压测量方法及装置 技术领域
本发明涉及医疗技术领域，特别是涉及一种血压测量方法及装置。
背景技术
高血压是最常见的一种心血管疾病，这种疾病越来越受到人们的重视和关注，血压测量也成为对高血压病情进行有效监控必不可少的手段。
近年来，随着移动医疗技术的发展，出现了一些血压间接测量方法，使得血压测量的便捷性得到提升。血压间接测量法是通过检测动脉管壁的搏动，血管容积变化等参数间接得到血压数据，例如动脉收缩压和动脉舒张压。
例如，广泛使用的血压间接测量方法之一为使用充气袖带来压迫血管的测压方法。对袖带充气的过程中，一旦袖带内压力超过动脉收缩压(Systolic Blood Pressure，SBP)，血管被压闭，血流被阻断，血管的远端就听不到动脉的搏动音。对袖带放气的过程中，当袖带内的气体压力低于动脉收缩压时血管开放，血流恢复，产生动脉搏动音，听到第一声动脉搏动音(即听诊音)时袖带内的气体压力即为动脉收缩压。继续放气，当袖带内的气体压力低于动脉舒张压(Diastolic Blood Pressure，DBP)时，血管完全通畅，血流不再被阻断，动脉的搏动音消失，此时袖带内的压力即为动脉舒张压。
另外一种常用的血压间接测量方法是振荡法(Oscillometric Method)，即利用袖带阻断动脉血流，在慢速放气过程中，检测源于血管壁的搏动振荡波包迹，并找出包迹与动脉血压之间的固有关系，进而得到血压数据。这种方法也在目前临床的各类电子血压计中广泛采用。
但是，上述两种血压间接测量方法均没有摆脱充气袖带的传统模式，每次获取血压数据均需要对袖带进行充放气，用充气袖带来压迫血管，使人体产生不适的感觉。此外，当受试者需要短时间内多次测量或长时间的连续测量时，给患者带来很多不便。
随着新技术的发展，已经有摆脱充气袖带传统模式的血压测量方法。
例如，利用脉搏波传导时间(Pulse Transit Time，PTT)和动脉血压有关的特点，现有技术提出利用PTT对血压进行测量，具体的，通过采集手指处光电容积脉搏波(PhotoPlethysmoGraphy，PPG)信号以及肢体导联的心电图(ElectroCardioGram，ECG)信号，计算血液从心脏传播到信号采集处的PTT，从而建立了动脉血压与脉搏传导时间的血压估算模型，可以实现计算人体实时血压值，实现无创连续测量并能彻底摆脱袖套的束缚。
但是，采用PTT推算获得血压信息的方法需要用到ECG信号，如果所用ECG导联方式为肢体导联，会很容易出现因肢体的接触不良，或，长时间不接触而产生ECG电极脱落，使ECG信号无法获取，进而导致无法测量血压。
此外，利用人群平均血压(收缩压和舒张压之和的一半,即(SBP+DBP)/2)与呼吸调控情况下的心率变异幅值存在相关性的特点，提出利用ECG对血压进行测量，具体的，通过采集ECG信号可以获取心率变异幅值，再利用人群平均血压与心率变异幅值之间的关系，可以得到平均血压。但是，采用这种方式获得血压信息同样还是需要采集ECG信号，这样就会出现与上面的PTT推算获得血压的方法相同的问题，由于接触不良或电极脱落造成ECG信号无法获取，从而导致无法准确测血压。
发明内容
本发明实施例提供一种血压测量方法及装置，用以克服接触不良或电极脱落造成ECG信号无法获取，以致无法准确测血压的问题。
本发明实施例提供的具体技术方案如下：
第一方面，一种血压测量方法，包括：
采集用户的心电ECG信号和光电容积脉搏波PPG信号；
获取脉搏波传导时间PTT采集时长，所述PTT采集时长是指所述ECG信号的信号质量满足第一预设条件且所述PPG信号的信号质量同时满足第二预设条件的时长；
若确定所述PTT采集时长大于或等于预设的PTT有效时长，则基于PTT血压计算模型获取所述用户的血压测量值；
若确定所述PTT采集时长小于预设的PTT有效时长，获取PPG采集时长，所述PPG采集时长是指所述PPG信号的信号质量满足第二预设条件的时长；
若确定所述PPG采集时长大于或等于预设的PPG有效时长，则基于PPG血压计算模型获取所述用户的血压测量值。
结合第一方面，在第一方面的第一种可能的实现方式中，还包括：
若确定所述PTT采集时长小于预设的PTT有效时长且所述PPG采集时长小于预设的PPG有效时长，获取ECG采集时长，所述ECG采集时长是指所述ECG信号的信号质量满足第一预设条件的时长；
若确定所述ECG采集时长大于或等于预设的ECG有效时长，则基于ECG血压计算模型获取所述用户的血压测量值。
结合第一方面，在第一方面的第二种可能的实现方式中，基于PPG血压计算模型获取所述用户的血压测量值，具体包括：
收集所述PTT血压计算模型中用于计算血压的数据；
根据收集到的数据计算PPG关联系数；
将所述PPG关联系数和所述收集到的数据带入所述PTT血压计算模型，得到根据PPG信号特征值计算血压的模型作为所述PPG血压计算模型；
将采集到的PPG信号对应的PPG信号特征值，代入所述PPG血压计算模型，计算所述用户的血压测量值。
结合第一方面或以上第一方面的任何一种可能的实现方式，在第一方面的第三种可能的实现方式中，所述第一预设条件为所述ECG信号的导联连接状态为正常连接状态且所述ECG信号的信噪比小于或等于第一阈值，或者所述ECG信号的导联连接状态为正常连接状态且所述ECG信号中的无效特征点在总共特征点中的占比小于或等于第二阈值，或者所述ECG信号的导联连接状态为正常连接状态且所述ECG信号连续获取心电R波的顶点位置。
结合第一方面或以上第一方面的任何一种可能的实现方式，在第一方面 的第四种可能的实现方式中，所述第二预设条件为所述PPG信号的信噪比小于或等于第三阈值，或者所述PPG信号中的无效特征点在总共特征点中的占比小于或等于第四阈值。
第二方面，一种血压测量装置，包括：
ECG信号采集电路，用于采集用户的ECG信号；
PPG信号采集电路，用于采集所述用户的PPG信号；
处理器，用于获取PTT采集时长，所述PTT采集时长是指所述ECG信号的信号质量满足第一预设条件且所述PPG信号的信号质量同时满足第二预设条件的时长；
若确定所述PTT采集时长大于或等于预设的PTT有效时长，则基于PTT血压计算模型获取所述用户的血压测量值；
若确定所述PTT采集时长小于预设的PTT有效时长，获取PPG采集时长，所述PPG采集时长是指所述PPG信号的信号质量满足第二预设条件的时长；
若确定所述PPG采集时长大于或等于预设的PPG有效时长，则基于PPG血压计算模型获取所述用户的血压测量值；
显示模块，用于显示所述用户的血压测量值。
结合第二方面，在第二方面的第一种可能的实现方式中，所述处理器还用于：
若确定所述PTT采集时长小于预设的PTT有效时长且所述PPG采集时长小于预设的PPG有效时长，获取ECG采集时长，所述ECG采集时长是指所述ECG信号的信号质量满足第一预设条件的时长；
若确定所述ECG采集时长大于或等于预设的ECG有效时长，则基于ECG血压计算模型获取所述用户的血压测量值。
结合第二方面，在第二方面的第二种可能的实现方式中，所述处理器基于PPG血压计算模型获取所述用户的血压测量值时，具体用于：
收集所述PTT血压计算模型中用于计算血压的数据；
根据收集到的数据计算PPG关联系数；
将所述PPG关联系数和所述收集到的数据带入所述PTT血压计算模型，得到根据PPG信号特征值计算血压的模型作为所述PPG血压计算模型；
将采集到的PPG信号对应的PPG信号特征值，代入所述PPG血压计算模型，计算所述用户的血压测量值。
结合第二方面或以上第二方面的任何一种可能的实现方式，在第二方面的第三种可能的实现方式中于，所述第一预设条件为所述ECG信号的导联连接状态为正常连接状态且所述ECG信号的信噪比小于或等于第一阈值，或者所述ECG信号的导联连接状态为正常连接状态且所述ECG信号中的无效特征点在总共特征点中的占比小于或等于第二阈值，或者所述ECG信号的导联连接状态为正常连接状态且所述ECG信号连续获取心电R波的顶点位置。
结合第二方面或以上第二方面的任何一种可能的实现方式，在第二方面的第四种可能的实现方式中，所述第二预设条件为所述PPG信号的信噪比小于或等于第三阈值，或者所述PPG信号中的无效特征点在总共特征点中的占比小于或等于第四阈值。
本发明有益效果如下：采用本发明实施例提供的方法，采集用户的ECG信号和PPG信号；获取PTT采集时长，PTT采集时长是指ECG信号的信号质量满足第一预设条件且PPG信号的信号质量同时满足第二预设条件的时长，；若确定PTT采集时长大于或等于预设的PTT有效时长，则基于PTT血压计算模型获取用户的血压测量值；若确定PTT采集时长小于预设的PTT有效时长，获取PPG采集时长，PPG采集时长是指PPG信号的信号质量满足第二预设条件的时长；若确定PPG采集时长大于或等于预设的PPG有效时长，则基于PPG血压计算模型获取用户的血压测量值。因此，采用本发明实施例的方法能够改善用户体验，即使ECG信号接触不良或电极脱落也能够获得用户的血压测量值，提升血压测量的效率。
附图说明
图1为本发明实施例中血压测量方法的概述流程图；
图2为本发明实施例中用户A测量血压的具体流程图；
图3为本发明实施例中血压测量装置的结构示意图。
具体实施方式
为使本发明实施例的目的、技术方案和优点更加清楚，下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
本发明实施例提供一种血压测量方法及装置，用以克服电极脱落致使ECG信号无法获取，从而导致无法进行血压测量的情形。其中，方法和装置是基于同一发明构思的，由于方法及装置解决问题的原理相似，因此装置与方法的实施可以相互参见，重复之处不再赘述。
下面结合附图对本发明优选的实施方式进行详细说明。
参阅图1所示，本发明实施例提供一种血压测量方法，其具体过程包括：
步骤110：采集用户的ECG信号和PPG信号。
具体地，可以是如下所述的过程：用户开启血压测量装置，并给出血压测量开启指示，血压测量装置接收到血压测量开启命令时，开始采集用户的ECG信号和PPG信号；
或者，用户开启血压测量装置之后，若血压测量装置确定采集到的用户ECG信号的导联连接状态处于正常连接状态的时长超过第一时长，则可以提示用户判断是否开启血压测量。若用户选择开启血压测量，则血压测量装置根据接收到的血压测量开启命令，开始测量用户血压。这里的第一时长为预设值，例如10s。
具体的，当ECG信号的导联连接状态处于正常连接状态的时长超过t1时，可以自动启动血压测量，当该时长小于t1时，可能是由于用户误碰造成，血压测量装置不会自动启动血压测量。
步骤120：获取PTT采集时长，PTT采集时长是指ECG信号的信号质量满足第一预设条件且PPG信号的信号质量同时满足第二预设条件的时长。
具体的，在血压测量装置采集到ECG信号和PPG信号后，需要分别对这两个信号的信号质量进行判断。
对PPG信号的信号质量进行判断时，这里的第二预设条件可以为PPG信号的信噪比小于或等于第三阈值，或者PPG信号中的无效特征点在总共特征点中的占比小于或等于第四阈值等。具体的，可以将PPG信号的信噪比小于或等于第三阈值的时长作为PPG采集时长，或者，将PPG信号中的无效特征点在总共特征点中的占比小于或等于第三阈值的时长作为PPG采集时长。
对ECG信号的信号质量进行判断时，首先判断ECG信号的导联连接状态是否正常，若导联脱落，则直接确定ECG信号不可用，若ECG信号的导联连接状态为正常连接状态，则进一步判断ECG信号质量，同理，ECG信号也可采用上述方法进行对信号质量进行判断。具体的，这里的第一预设条件可以为ECG信号的导联连接状态为正常连接状态且ECG信号的信噪比小于或等于第一阈值的时长作为ECG采集时长，或者，ECG信号的导联连接状态为正常连接状态且ECG信号中的无效特征点在总共特征点中的占比小于或等于第二阈值的时长作为ECG采集时长。此外，针对ECG信号还可以以能连续获取心电R波的顶点位置作为第一预设条件。其中，R波可采用阈值检测方式识别。因此，还可以将ECG信号的导联连接状态为正常连接状态且ECG信号连续获取心电R波的顶点位置的时长作为ECG采集时长。
这里不限于上述信号质量的判断方式，现有技术中提供了多种判断信号质量的方法，这里不再赘述。
由于PTT需要通过同步采集的ECG信号和PPG信号获得，所以将ECG信号的信号质量满足第一预设条件且PPG信号的信号质量同时满足第二预设条件的时长作为PTT采集时长。
具体的，通过ECG信号获取R波的位置信息tECG，通过PPG信号获取上升沿最大斜率值、波谷、波顶、重搏波顶点之类的任一特征点的位置信息tPPG， 同步采集上述信息后获得PPT信息，PTTw＝tPPG-tECG。
步骤130：若确定PTT采集时长大于或等于预设的PTT有效时长，则基于PTT血压计算模型获取用户的血压测量值。
通过步骤120获得PTT采集时长后，进一步判断PTT采集时长与预设的PTT有效时长之间的关系，这里的预设的PTT有效时长可以是根据经验值确定的。所谓PTT有效时长是指欲采用PTT血压计算模型获取用户的血压测量值必须满足的最短测量时长，且在该时长中ECG信号的信号质量满足第一预设条件且PPG信号的信号质量同时满足第二预设条件。具体的，在心脏的每个搏动周期里，有效的ECG波形特征点和有效的PPG波形特征点能够形成一个有效配对，称为一个有效PTT配对周期。PTT有效时长由多个有效PTT配对周期组成。其中，ECG波形特征点通常是指R波位置，PPG波形特征点通常是指波谷、波顶、上升沿最大斜率点等位置。
当血压测量装置确定PTT采集时长大于或等于预设的PTT有效时长时，根据PTT采集时长对应的ECG信号和PPG信号，计算得到对应的PTT结果，并将得到的PTT结果代入到PTT血压计算模型中计算用户的血压测量值，其中，PTT血压计算模型可以采用但不限于以下公式：
Figure PCTCN2015096366-appb-000001
Figure PCTCN2015096366-appb-000002
其中，SBP0为收缩压校准值，DBP0为舒张压校准值，PTTw0为脉搏波传播时间校准值，PTTw为当前脉搏波传播时间，A为预设系数，与血管壁弹性相关。
需要指出的是，这里可以根据PTT采集时长对应的ECG信号和PPG信号，计算得到对应的PTT结果，并将得到的PTT结果代入到PTT血压计算模型中计算用户的血压测量值。此外，也可以在确定PTT采集时长大于或等于预设的PTT有效时长后，针对后续采集到的ECG信号和PPG信号，在确定 同时采集的ECG信号满足第一预设条件且PPG信号满足第二预设条件时，计算对应的PTT，并将PTT代入PTT血压计算模型中计算用户的血压测量值。
进一步地，在根据PTT采集时长对应的ECG信号和PPG信号，计算得到对应的PTT结果，并将得到的PTT结果代入到PTT血压计算模型中计算用户的血压测量值时，可以将采集时长内得到的多个PTT求平均值，或者根据多个PTT的分布权重，将预设范围内的PTT求平均值，然后将PTT平均值代入PTT血压计算模型。
又或者，根据PTT采集时长对应的ECG信号和PPG信号，计算得到对应的PTT结果，将多个PTT分别代入PTT血压计算模型求得血压值，然后将得到的多个血压值求平均值，或者，根据多个血压值的分布权重，将分布在预设范围内的血压值求平均值，作为用户的血压测量值。
例如，假设得到的高压值为121、122、121、130、125这5个血压数据，求这个五个高压值的平均值为123.8。或者，将分布于80％以内的高压值求平均值，此时分布于80％以内的高压值只有121、122、121、125，求得平均值为122.25。
步骤140：若确定PTT采集时长小于预设的PTT有效时长，获取PPG采集时长，PPG采集时长是指PPG信号的信号质量满足第二预设条件的时长。
当血压测量装置确定PTT采集时长小于预设的PTT有效时长时，进一步确定PPG采集时长，PPG采集时长是指PPG信号的信号质量满足第二预设条件的时长。
步骤150：若确定PPG采集时长大于或等于预设的PPG有效时长，则基于PPG血压计算模型获取所述用户的血压测量值。
通过步骤140获得PPG采集时长后，进一步判断PPG采集时长与预设的PPG有效时长之间的关系，这里的预设的PPG有效时长可以是根据经验值确定的。所谓PPG有效时长是指欲采用PPG血压计算模型获取用户的血压测量值必须满足的最短测量时长，且在该时长中PPG信号的信号质量满足第二预设条件。具体的，两个相邻、有效的PPG波形特征点构成一个PPG有效周期。 PPG有效时长由多个有效的PPG有效周期组成。PPG波形特征点常用的是波谷、波顶、上升沿最大斜率点等位置。
当血压测量装置确定PPG采集时长大于或等于预设的PPG有效时长时，根据PPG采集时长内采集到的PPG信号确定对应的PPG信号特征值，将得到的PPG信号特征值代入PPG血压计算模型计算用户的血压测量值。
其中，PPG血压测量模型可以通过如下方法获得，这里采用但不限于以下公式：
首先，收集PTT血压计算模型中用于计算血压的数据，例如，SBP0(收缩压校准值)，DBP0(舒张压校准值)，PTTw0(脉搏波传播时间校准值)以及收集ECG的R波位置、R波幅值、PPG波形顶点、PPG波形底点、PPG波形上升沿斜率最大点等信息等。
第二.根据收集到的数据计算PPG关联系数B，其中，PPG关联系数B的计算公式为：
B＝PTTw0 2/b
(SBP-DBP)＝b*(SBP0-DBP0)*HPPG
b是前后两次血压差值与PPG波形高度的比例系数。该比例系数需要通过经验数据积累获得。
第三，将PPG关联系数和收集到的数据带入PTT血压计算模型，得到根据PPG信号特征值计算血压的模型作为PPG血压计算模型。
这里的PPG信号的特征值为HPPG，即PPG波形高度，则PPG血压计算模型为：
DBP＝SBP0/3+2*DBP0/3+(A/2)*ln(HPPG*PTTW0 2/B)-(SBP0-DBP0)*HPPG*
PTTW0 2/(3*B)
SBP＝DBP+(SBP0-DBP0)*HPPG/b
需要指出的是，这里可以将PPG采集时长对应的PPG信号特征值代入到PTT血压计算模型中计算用户的血压测量值。此外，也可以在确定PPG采集时长大于或等于预设的PPG有效时长后，针对后续采集到的PPG信号，在确 定采集到的PPG信号满足第二预设条件时，将对应的PPG信号特征值代入PPG血压计算模型中计算用户的血压测量值。
此外，血压测量装置若确定PTT采集时长小于预设的PTT有效时长且PPG采集时长小于预设的PPG有效时长，则可以获取ECG采集时长，ECG采集时长是指ECG信号的信号质量满足第一预设条件的时长。血压测量装置若确定ECG采集时长大于或等于预设的ECG有效时长，则基于ECG血压计算模型获取用户的血压测量值。这里的预设的ECG有效时长是根据经验值确定的。所谓ECG有效时长是指欲采用ECG血压计算模型获取用户的血压测量值必须满足的最短测量时长，且在该时长中ECG信号的信号质量满足第一预设条件。具体的，两个相邻、有效的ECG波形特征点构成一个ECG有效周期。ECG有效时长由多个有效的ECG有效周期组成。ECG波形特征点通常是指R波位置。
具体的，根据ECG信号对用户进行血压测量前，需要根据年龄、性别、体重等信息，建立SBP与心率变异值之间的关系，即SBP＝KECG1*RR，以及(SBP+DBP)/2与心率变异值之间的关系式，即(SBP+DBP)/2＝KECG2*RR。
其中，KECG1、KECG2是大量人群采集后获得的经验系数，RR是心率变异值，该通过对ECG信号进行计算和分析后获得。结合用户提供的年龄、性别、体重等信息确定KECG1、KECG2，进一步计算出SBP值以及DBP值。
当血压测量装置确定基于ECG血压计算模型获取用户的血压测量值后，若PPG信号的信号质量改善，PTT采集时长大于或等于预设的PTT有效时长，则转成基于PTT血压计算模型获取用户的血压测量值，若ECG信号的信号质量变差，而PPG信号的信号质量改善，且PPG采集时长大于或等于预设的PPG有效时长，则转成基于PPG血压计算模型获取用户的血压测量值。
由于基于PPG测血压的方式相比基于ECG测血压的方式，获得的血压数据精确度更高，故本发明实施例中当基于PTT测血压的方法不可用时，可以优先考虑使用基于PPG测血压的方式。
而在另一种场景下，基于PTT测血压的方法可能会因PPG信号质量差而 无法正常进行，例如，因个体肤色、测量部位损伤、弱灌注等现象，使得获得的PPG信号质量差，导致无法进行PPG特征点识别。这种情况下，可以采用基于ECG测血压的方式。进一步地，为了改善PPG信号质量，可以调节光强，当调节光强后的PPG信号质量达到要求后，如果PTT采集时长达到预设的PTT有效时长，则进行PTT方式血压测量；如果PTT采集时长未达到预设的PTT有效时长，而PPG采集时长达到预设的PPG有效时长，则采用PPG方式血压测量；如果PTT采集时长、PPG采集时长都未达到预设值，则继续采用ECG测量方式。
实施例1，以图2为例，针对用户A进行血压测量，具体为：
步骤201：用户A启动血压测量。
步骤202：血压测量装置采集用户A的ECG信号和PPG信号。
步骤203：血压测量装置获取PTT采集时长，判断PTT采集时长是否大于或等于预设的PTT有效时长，若是则执行步骤204，否则执行步骤205。
步骤204：血压测量装置基于PTT血压计算模型计算用户A的血压测量值。
步骤205：血压测量装置获取PPG采集时长，判断PPG采集时长是否大于或等于预设的PPG有效时长，若是执行步骤206，否则执行步骤207。
步骤206：血压测量装置基于PPG血压计算模型计算用户A的血压测量值。
步骤207：血压测量装置获取ECG采集时长，判断ECG采集时长是否大于或等于预设的ECG有效时长，若是执行步骤208，否则执行步骤209。
步骤208：血压测量装置基于ECG血压计算模型计算用户A的血压测量值。
步骤209：血压测量装置提示用户A血压测量失败。
参阅图3所示，本发明实施例提供一种血压测量装置30，具体可以为手表、手环或其它穿戴式设备，也可以是平板电脑等，该装置包括：
ECG信号采集电路31，用于采集用户的ECG信号；
PPG信号采集电路32，用于采集用户的PPG信号；
处理器33，用于获取PTT采集时长，所述PTT采集时长是指所述ECG信号的信号质量满足第一预设条件且所述PPG信号的信号质量同时满足第二预设条件的时长；
若确定所述PTT采集时长大于或等于预设的PTT有效时长，则基于PTT血压计算模型获取用户的血压测量值；
若确定所述PTT采集时长小于预设的PTT有效时长，获取PPG采集时长，PPG采集时长是指PPG信号的信号质量满足第二预设条件的时长；
若确定所述PPG采集时长大于或等于预设的PPG有效时长，则基于PPG血压计算模型获取用户的血压测量值；
显示模块34，用于显示用户的血压测量值。
可选的，处理器33还用于：
若确定所述PTT采集时长小于预设的PTT有效时长且PPG采集时长小于预设的PPG有效时长，获取ECG采集时长，所述ECG采集时长是指所述ECG信号的信号质量满足第一预设条件的时长；
若确定ECG采集时长大于或等于预设的ECG有效时长，则基于ECG血压计算模型获取用户的血压测量值。
可选的，处理器33基于PPG血压计算模型获取用户的血压测量值时，具体可以用于：
收集PTT血压计算模型中用于计算血压的数据；
根据收集到的数据计算PPG关联系数；
将PPG关联系数和收集到的数据带入PTT血压计算模型，得到根据PPG信号特征值计算血压的模型作为PPG血压计算模型；
将采集到的PPG信号对应的PPG信号特征值，代入PPG血压计算模型，计算用户的血压测量值。
可选的，第一预设条件为ECG信号的导联连接状态为正常连接状态且ECG信号的信噪比小于或等于第一阈值，或者ECG信号的导联连接状态为正 常连接状态且ECG信号中的无效特征点在总共特征点中的占比小于或等于第二阈值，或者ECG信号的导联连接状态为正常连接状态且ECG信号连续获取心电R波的顶点位置。
可选的，第二预设条件为PPG信号的信噪比小于或等于第三阈值，或者PPG信号中的无效特征点在总共特征点中的占比小于或等于第四阈值。
这里的处理器33可以是一个芯片，如线程现场可编程门阵列(Field-Programmable Gate Array，FPGA)、面向应用的集成电路(Application Specific Integrated Circuit，ASIC),也可以是它们的组合。
本发明实施例中不限定上述部件之间的具体连接介质。本发明实施例在图3中以ECG信号采集电路31、PPG信号采集电路32、处理器33以及显示模块34之间通过总线35连接，总线在图3中以粗线表示，其它部件之间的连接方式，仅是进行示意性说明，并不引以为限。所述总线可以分为地址总线、数据总线、控制总线等。为便于表示，图3中仅用一条粗线表示，但并不表示仅有一根总线或一种类型的总线。
综上所述，采用本发明实施例提供的方法，采集用户的ECG信号和PPG信号；获取PTT采集时长，若确定PTT采集时长大于或等于预设的PTT有效时长，则基于PTT血压计算模型获取用户的血压测量值；若确定PTT采集时长小于预设的PTT有效时长，获取PPG采集时长；若确定PPG采集时长大于或等于预设的PPG有效时长，则基于PPG血压计算模型获取用户的血压测量值。因此，采用本发明实施例的方法能够改善用户体验，即使ECG信号接触不良或电极脱落也能够获得用户的血压测量值，提升血压测量的效率。
需要说明的是，本发明实施例中提供的方法的各个步骤之间可以并行或串行进行，某些步骤也可以是包括在之前的一个步骤中一起实现，比如，获取PPG采集时长这个步骤也可以是在前面的获取PTT采集时长的过程中就获取到了。
本文中所述“第一”、“第二”……等仅用于区分不同的对象，并不代表特定的顺序或对象的数值大小的特定关系。
本领域内的技术人员应明白，本发明的实施例可提供为方法、系统、或计算机程序产品。因此，本发明可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实施例的形式。而且，本发明可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器、CD-ROM、光学存储器等)上实施的计算机程序产品的形式。
本发明是参照根据本发明实施例的方法、设备(系统)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器，使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中，使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品，该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
尽管已描述了本发明的优选实施例，但本领域内的技术人员一旦得知了基本创造性概念，则可对这些实施例作出另外的变更和修改。所以，所附权利要求意欲解释为包括优选实施例以及落入本发明范围的所有变更和修改。
显然，本领域的技术人员可以对本发明实施例进行各种改动和变型而不脱离本发明实施例的精神和范围。这样，倘若本发明实施例的这些修改和变 型属于本发明权利要求及其等同技术的范围之内，则本发明也意图包含这些改动和变型在内。

Claims (10)

  1. 一种血压测量方法，其特征在于，包括：
    采集用户的心电ECG信号和光电容积脉搏波PPG信号；
    获取脉搏波传导时间PTT采集时长，所述PTT采集时长是指所述ECG信号的信号质量满足第一预设条件且所述PPG信号的信号质量同时满足第二预设条件的时长；
    若确定所述PTT采集时长大于或等于预设的PTT有效时长，则基于PTT血压计算模型获取所述用户的血压测量值；
    若确定所述PTT采集时长小于预设的PTT有效时长，获取PPG采集时长，所述PPG采集时长是指所述PPG信号的信号质量满足第二预设条件的时长；
    若确定所述PPG采集时长大于或等于预设的PPG有效时长，则基于PPG血压计算模型获取所述用户的血压测量值。
  2. 如权利要求1所述的方法，其特征在于，还包括：
    若确定所述PTT采集时长小于预设的PTT有效时长且所述PPG采集时长小于预设的PPG有效时长，获取ECG采集时长，所述ECG采集时长是指所述ECG信号的信号质量满足第一预设条件的时长；
    若确定所述ECG采集时长大于或等于预设的ECG有效时长，则基于ECG血压计算模型获取所述用户的血压测量值。
  3. 如权利要求1所述的方法，其特征在于，基于PPG血压计算模型获取所述用户的血压测量值，具体包括：
    收集所述PTT血压计算模型中用于计算血压的数据；
    根据收集到的数据计算PPG关联系数；
    将所述PPG关联系数和所述收集到的数据带入所述PTT血压计算模型，得到根据PPG信号特征值计算血压的模型作为所述PPG血压计算模型；
    将采集到的PPG信号对应的PPG信号特征值，代入所述PPG血压计算模型，计算所述用户的血压测量值。
  4. 如权利要求1～3任一所述的方法，其特征在于，所述第一预设条件为所述ECG信号的导联连接状态为正常连接状态且所述ECG信号的信噪比小于或等于第一阈值，或者所述ECG信号的导联连接状态为正常连接状态且所述ECG信号中的无效特征点在总共特征点中的占比小于或等于第二阈值，或者所述ECG信号的导联连接状态为正常连接状态且所述ECG信号连续获取心电R波的顶点位置。
  5. 如权利要求1～4任一所述的方法，其特征在于，所述第二预设条件为所述PPG信号的信噪比小于或等于第三阈值，或者所述PPG信号中的无效特征点在总共特征点中的占比小于或等于第四阈值。
  6. 一种血压测量装置，其特征在于，包括：
    ECG信号采集电路，用于采集用户的ECG信号；
    PPG信号采集电路，用于采集所述用户的PPG信号；
    处理器，用于获取PTT采集时长，所述PTT采集时长是指所述ECG信号的信号质量满足第一预设条件且所述PPG信号的信号质量同时满足第二预设条件的时长；
    若确定所述PTT采集时长大于或等于预设的PTT有效时长，则基于PTT血压计算模型获取所述用户的血压测量值；
    若确定所述PTT采集时长小于预设的PTT有效时长，获取PPG采集时长，所述PPG采集时长是指所述PPG信号的信号质量满足第二预设条件的时长；
    若确定所述PPG采集时长大于或等于预设的PPG有效时长，则基于PPG血压计算模型获取所述用户的血压测量值；
    显示模块，用于显示所述用户的血压测量值。
  7. 如权利要求6所述的装置，其特征在于，所述处理器还用于：
    若确定所述PTT采集时长小于预设的PTT有效时长且所述PPG采集时长小于预设的PPG有效时长，获取ECG采集时长，所述ECG采集时长是指所述ECG信号的信号质量满足第一预设条件的时长；
    若确定所述ECG采集时长大于或等于预设的ECG有效时长，则基于ECG 血压计算模型获取所述用户的血压测量值。
  8. 如权利要求6所述的装置，其特征在于，所述处理器基于PPG血压计算模型获取所述用户的血压测量值时，具体用于：
    收集所述PTT血压计算模型中用于计算血压的数据；
    根据收集到的数据计算PPG关联系数；
    将所述PPG关联系数和所述收集到的数据带入所述PTT血压计算模型，得到根据PPG信号特征值计算血压的模型作为所述PPG血压计算模型；
    将采集到的PPG信号对应的PPG信号特征值，代入所述PPG血压计算模型，计算所述用户的血压测量值。
  9. 如权利要求6～8任一所述的装置，其特征在于，所述第一预设条件为所述ECG信号的导联连接状态为正常连接状态且所述ECG信号的信噪比小于或等于第一阈值，或者所述ECG信号的导联连接状态为正常连接状态且所述ECG信号中的无效特征点在总共特征点中的占比小于或等于第二阈值，或者所述ECG信号的导联连接状态为正常连接状态且所述ECG信号连续获取心电R波的顶点位置。
  10. 如权利要求6～9任一所述的装置，其特征在于，所述第二预设条件为所述PPG信号的信噪比小于或等于第三阈值，或者所述PPG信号中的无效特征点在总共特征点中的占比小于或等于第四阈值。
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