CN109717854B - Blood pressure measuring device - Google Patents
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- CN109717854B CN109717854B CN201811613353.3A CN201811613353A CN109717854B CN 109717854 B CN109717854 B CN 109717854B CN 201811613353 A CN201811613353 A CN 201811613353A CN 109717854 B CN109717854 B CN 109717854B
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Abstract
The present invention provides a blood pressure measuring apparatus, including: a final inflation cut-off pressure value obtaining module for obtaining a pulse signal, if a pulse amplitude is greater than a previous pulse amplitude and a next pulse amplitude, increasing a pressure value corresponding to the pulse amplitude by a first margin to obtain a first predicted inflation cut-off pressure value, continuously detecting the change of the pulse amplitude, if the ratio of the current pulse amplitude to the pulse amplitude is less than a first threshold, taking the pressure value corresponding to the current pulse amplitude as a second predicted inflation cut-off pressure value, and taking the first predicted inflation cut-off pressure value or the second predicted inflation cut-off pressure value as a final inflation cut-off pressure value; and the constant-speed linear deflation adjusting module is used for setting an initial pulse width modulation value according to the final inflation cut-off pressure value, and adjusting the size of the initial pulse width modulation value according to the pulse amplitude detected in real time to realize constant-speed linear deflation. The blood pressure measuring equipment provided by the embodiment of the invention can obtain a more accurate blood pressure measured value.
Description
Technical Field
The embodiment of the invention relates to the technical field of detection, in particular to a blood pressure measuring method and equipment.
Background
Epidemiological investigation and large-scale prospective research show that hypertension is an independent risk factor of cardiovascular diseases, and self-service daily blood pressure monitoring by adopting an electronic sphygmomanometer is an important way for preventing serious cardiovascular events. The oscillation method of the non-invasive blood pressure monitoring mainly depends on the blood pressure monitoring which is finished by integrally coordinating hardware and software, wherein the hardware part mainly comprises an amplifying circuit for cuff pressure and pressure pulse signals, an overvoltage protection and digital circuit and a deflation valve. Most of relief valves adopt the pneumatic valve of noncontinuous gassing, at present most adopt traditional step gassing method, step gassing each time, pressure reduces 5Hg ~ 10mmHg, the gassing speed should not be too fast or slow, each time the gassing all can produce the sharp signal of sudden change of great amplitude, make the pulse signal of gathering present the echelonment like this, be unfavorable for the extraction to true pulse peak value, and during the gassing, pressure reduces too much, lose the pulse wave data when true systolic pressure and diastolic pressure correspond to pressure easily, even follow-up interpolation method of adopting fitting is corrected, the pulse systolic pressure, diastolic pressure, average characteristic point and true value that obtain have the skew, make the measurement have great error. The step deflation method has the advantages that the step deflation is staged, the pressure in the oversleeve drops steeply during each deflation, the pulse wave can be distorted, the pressure of the oversleeve can be recovered to be normal after 1-2 s, the deflation valve can be closed after each step deflation, the pulse wave peak value is extracted after the step deflation stays for 4-6 s, and therefore the measurement time of the step deflation method is long.
In the conventional inflation process, a specified pressure value, such as 160mmHg, set by the system is used as a reference, and the system enters a secondary pressurization or deflation state according to the detected pulse wave amplitude value after being inflated to the specified pressure value. When the blood pressure of the patient is low, the patient is inflated to a designated value, the deflation process is slow, and the arm of the patient is pressed to be painful due to overhigh inflation pressure; when a patient belongs to a hypertensive patient, after the patient is inflated to a specified pressure, secondary pressurization and insufficient pressure compensation are carried out, even under the condition that three times of pressurization are needed, the inflation process is too long, the deflation measurement time is too long, and the arm of the patient is pressed and painful.
The inflation and deflation processes are similar and correspond to the change state of the pulse wave pressure amplitude which is increased firstly and then reduced, based on the current situation, the method finds out a method for extracting the pulse wave in the inflation process, determining the position corresponding to the pulse wave with the maximum amplitude, and inflating the system to the estimated pressurization value, thereby reducing the uncomfortable compression feeling caused by the mismatch of inflation time and inflation pressure, and being capable of obtaining the more accurate pulse peak value and pressure result, thereby becoming the technical problem to be solved urgently in the industry.
Disclosure of Invention
In order to solve the above problems in the prior art, embodiments of the present invention provide a method and an apparatus for measuring blood pressure.
In a first aspect, an embodiment of the present invention provides a blood pressure measurement method, including: obtaining a pulse signal, if a pulse amplitude is greater than a previous pulse amplitude and a next pulse amplitude, increasing a pressure value corresponding to the pulse amplitude by a first margin to obtain a first predicted inflation cut-off pressure value, continuously detecting the change of the pulse amplitude, if the ratio of the current pulse amplitude to the pulse amplitude is less than a first threshold, taking the pressure value corresponding to the current pulse amplitude as a second predicted inflation cut-off pressure value, and taking the first predicted inflation cut-off pressure value or the second predicted inflation cut-off pressure value as a final inflation cut-off pressure value; and setting an initial pulse width modulation value according to the final inflation cut-off pressure value, and adjusting the size of the initial pulse width modulation value according to the pulse amplitude detected in real time to realize uniform-speed linear deflation.
Further, the acquiring the pulse signal includes: and extracting pulse wave peak signals by adopting a band-pass filter and a difference method.
Further, the taking the first predicted inflation cutoff pressure value or the second predicted inflation cutoff pressure value as a final inflation cutoff pressure value includes: and acquiring an arithmetic sum of the second predicted inflation cutoff pressure value and a second threshold value, if the first predicted inflation cutoff pressure value is larger than the arithmetic sum, taking the second predicted inflation cutoff pressure value as a final inflation cutoff pressure value, and if the first predicted inflation cutoff pressure value is smaller than or equal to the arithmetic sum, taking the first predicted inflation cutoff pressure value as a final inflation cutoff pressure value.
Further, the setting an initial pulse width modulation value according to the final inflation cut-off pressure value includes: if the final inflation cut-off pressure value is larger than or equal to 250mmHg, setting an initial pulse width modulation value to be 3200 ms; if the final inflation cut-off pressure value is larger than 200mmHg and smaller than 250mmHg, setting an initial pulse width modulation value to be 3150 ms; if the final inflation cut-off pressure value is larger than 130mmHg and smaller than or equal to 200mmHg, setting an initial pulse width modulation value to 3100 ms; if the final inflation cut-off pressure value is larger than 100mmHg and smaller than or equal to 130mmHg, setting an initial pulse width modulation value to be 3070 ms; and if the final inflation cut-off pressure value is less than or equal to 100mmHg, setting the initial pulse width modulation value to be 3050 ms.
Further, the adjusting the initial pulse width modulation value according to the pulse amplitude detected in real time to realize uniform linear deflation includes: if the pulse amplitude detected in real time is smaller than a third threshold value, adjusting the initial pulse width modulation value and accelerating the deflation speed; and if the pulse amplitude detected in real time is larger than or equal to a third threshold value, adjusting the initial pulse width modulation value and slowing down the deflation speed.
Further, said increasing the deflation speed results in a rapid decrease of the pressure in the cuff, and accordingly, the magnitude of the decrease of the pressure in the cuff includes: the pressure drop amplitude in the oversleeve is less than or equal to 10 mmHg/s.
In a second aspect, an embodiment of the present invention provides a blood pressure measuring device, including:
a final inflation cut-off pressure value obtaining module, configured to obtain a pulse signal, increase a pressure value corresponding to a pulse amplitude by a first margin if the pulse amplitude is greater than a previous pulse amplitude and a next pulse amplitude, to obtain a first predicted inflation cut-off pressure value, continue to detect a change in the pulse amplitude, and if a ratio of a current pulse amplitude to the pulse amplitude is smaller than a first threshold, use the pressure value corresponding to the current pulse amplitude as a second predicted inflation cut-off pressure value, and use the first predicted inflation cut-off pressure value or the second predicted inflation cut-off pressure value as a final inflation cut-off pressure value;
and the constant-speed linear deflation adjusting module is used for setting an initial pulse width modulation value according to the final inflation cut-off pressure value, and adjusting the size of the initial pulse width modulation value according to the pulse amplitude detected in real time to realize constant-speed linear deflation.
In a third aspect, an embodiment of the present invention provides an electronic device, including:
at least one processor; and
at least one memory communicatively coupled to the processor, wherein:
the memory stores program instructions executable by the processor, the processor invoking the program instructions to be able to perform the blood pressure measurement method provided by any of the various possible implementations of the first aspect.
In a fourth aspect, embodiments of the present invention provide a non-transitory computer-readable storage medium storing computer instructions for causing a computer to perform a blood pressure measurement method provided in any one of the various possible implementations of the first aspect.
According to the blood pressure measuring method and the blood pressure measuring equipment provided by the embodiment of the invention, the final inflation cut-off pressure value is obtained by comparing the two predicted inflation cut-off pressure values, then a reasonable initial pulse width modulation value is set aiming at the final inflation cut-off pressure value, and then pulse width control modulation is carried out according to the deflation speed on the basis of the initial pulse width modulation value, so that the uniform linear deflation effect is realized, a more accurate blood pressure measurement value is finally obtained, and the discomfort of a patient in the inflation process is relieved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description will be given below to the drawings required for the description of the embodiments or the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a flow chart of a blood pressure measurement method according to an embodiment of the present invention;
FIG. 2 is a graph illustrating the relationship between the mean pressure and the diastolic pressure according to an embodiment of the present invention;
FIG. 3 is a graph comparing the uniform linear deflation effect with the step deflation effect provided by the embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a blood pressure measuring device according to an embodiment of the present invention;
fig. 5 is a schematic physical structure diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. In addition, technical features of various embodiments or individual embodiments provided by the invention can be arbitrarily combined with each other to form a feasible technical solution, but must be realized by a person skilled in the art, and when the technical solution combination is contradictory or cannot be realized, the technical solution combination is not considered to exist and is not within the protection scope of the present invention.
An embodiment of the present invention provides a blood pressure measurement method, and referring to fig. 1, the method includes:
101. obtaining a pulse signal, if a pulse amplitude is greater than a previous pulse amplitude and a next pulse amplitude, increasing a pressure value corresponding to the pulse amplitude by a first margin to obtain a first predicted inflation cut-off pressure value, continuously detecting the change of the pulse amplitude, if the ratio of the current pulse amplitude to the pulse amplitude is smaller than a first threshold (specifically, 1:5), taking the pressure value corresponding to the current pulse amplitude as a second predicted inflation cut-off pressure value, and taking the first predicted inflation cut-off pressure value or the second predicted inflation cut-off pressure value as a final inflation cut-off pressure value;
102. and setting an initial pulse width modulation value according to the final inflation cut-off pressure value, and adjusting the size of the initial pulse width modulation value according to the pulse amplitude detected in real time to realize uniform-speed linear deflation.
On the basis of the above embodiment, the blood pressure measuring method provided in the embodiment of the present invention, wherein the obtaining of the pulse signal, includes: and extracting pulse wave peak signals by adopting a band-pass filter and a difference method. Specifically, because the pressure in the cuff is gradually increased to the point that the cuff is spread when the cuff is inflated, the cuff pressure is smaller than the diastolic pressure of the radial artery, only a pressure oscillation change curve generated between the gas pressure in the cuff and the inner wall of the cuff is in a cuff pressure curve, the amplitude is usually smaller and the frequency is high, when the cuff pressure is increased to the diastolic pressure, a pulse wave gradually appears, as a main wave, the oscillation of the gas pressure and the pressure change of the inner wall of the cuff is superposed on the pulse wave, when the cuff pressure is increased to the average pressure, the pulse amplitude is increased to the maximum, and when the cuff pressure is increased to exceed the systolic pressure, the pulse amplitude is gradually reduced. Because the pressure change curve between the gas pressure in the cuff and the cuff is a low-amplitude and high-frequency signal, and the pulse signal of the human body is between 0.5Hz and 5Hz, a band-pass filter of 0.5Hz to 5Hz is adopted to filter the gas oscillation noise signal and extract the pulse wave signal. And then, extracting pulse wave peak signals by adopting a difference method, recording the change process of the wave peak amplitude, and when the pulse amplitude is greater than the previous pulse amplitude and greater than the next pulse amplitude, at the moment, the pulse amplitude with the maximum amplitude is the position corresponding to the approximate average pressure, and adding a first margin (the size can be 50mmHg) on the basis of the average pressure according to the pressure difference empirical relationship between the average pressure and the systolic pressure, namely the first predicted inflation cut-off pressure value.
On the basis of the foregoing embodiment, the blood pressure measurement method provided in an embodiment of the present invention, where the taking the first predicted inflation cutoff pressure value or the second predicted inflation cutoff pressure value as the final inflation cutoff pressure value includes: and acquiring an arithmetic sum of the second predicted inflation cutoff pressure value and a second threshold value, if the first predicted inflation cutoff pressure value is larger than the arithmetic sum, taking the second predicted inflation cutoff pressure value as a final inflation cutoff pressure value, and if the first predicted inflation cutoff pressure value is smaller than or equal to the arithmetic sum, taking the first predicted inflation cutoff pressure value as a final inflation cutoff pressure value. The second predicted inflation cutoff pressure is set to be compared to the first predicted inflation cutoff pressure primarily because the first margin is an empirical value and the pressure differential between the mean pressure and the systolic pressure is not within the empirical range for a particular patient. The final inflation cut-off pressure value can be obtained specifically by referring to fig. 2, where fig. 2 includes: diastolic curve 201 and mean pressure curve 202. As can be seen from fig. 2, three representative points are marked on the average pressure curve 202, and the coordinates are: x: 1201, Y: 110.8 of the total weight of the mixture; x: 1514, Y: 132.1; x: 1594, Y: 128.7. the inflation process is also a change process that the pulse wave amplitude value is gradually reduced from small to small, after band-pass filtering, the pulse wave is extracted, the position with the maximum pulse wave amplitude value is found, corresponding average pressure is determined, a first margin value is added according to the relation between an average pressure curve 202 and a diastolic pressure curve 201 to determine a first predicted inflation cut-off pressure value, and after the change of the pulse wave amplitude value is smaller than a certain threshold value, a second predicted inflation cut-off pressure value is determined. The method can automatically and accurately obtain the inflation cut-off pressure, all people do not need to be inflated to the specified pressure value uniformly, the discomfort of the patient is increased, and the measurement time can be shortened.
On the basis of the above embodiment, the blood pressure measurement method provided in the embodiment of the present invention, where setting the initial pulse width modulation value according to the final inflation cut-off pressure value includes: if the final inflation cut-off pressure value is larger than or equal to 250mmHg, setting an initial pulse width modulation value to be 3200 ms; if the final inflation cut-off pressure value is larger than 200mmHg and smaller than 250mmHg, setting an initial pulse width modulation value to be 3150 ms; if the final inflation cut-off pressure value is larger than 130mmHg and smaller than or equal to 200mmHg, setting an initial pulse width modulation value to 3100 ms; if the final inflation cut-off pressure value is larger than 100mmHg and smaller than or equal to 130mmHg, setting an initial pulse width modulation value to be 3070 ms; and if the final inflation cut-off pressure value is less than or equal to 100mmHg, setting the initial pulse width modulation value to be 3050 ms. Different initial pulse width modulation values (namely PWM values, the same below) are set mainly based on different inflation cut-off pressures, corresponding to different initial pressure values in the cuff, when the cuff is deflated with a constant PWM value, the change curve of the cuff gas pressure is nonlinear, when the inflation cut-off pressure is higher, the deflation speed is faster than the descending speed of the low state of the inflation cut-off pressure, otherwise, when the inflation cut-off pressure is lower, the deflation speed is slower when the constant PWM value is deflated, and therefore a PWM initial value needs to be preset according to different inflation cut-off pressures and the predicted average pressure.
On the basis of the above embodiment, the blood pressure measuring method provided in the embodiment of the present invention, in which the initial pulse width modulation value is adjusted according to the pulse amplitude detected in real time to achieve uniform linear deflation, includes: if the pulse amplitude detected in real time is smaller than a third threshold value, adjusting the initial pulse width modulation value and accelerating the deflation speed; and if the pulse amplitude detected in real time is larger than or equal to a third threshold value, adjusting the initial pulse width modulation value and slowing down the deflation speed. The ideal deflation speed is 3 mmHg-5 mmHg per second, an ideal deflation pressure change curve can be obtained according to the inflation cut-off pressure value, the deflation speed and the deflation valve switch adjustment time, but the actual deflation speed is related to the initial deflation speed and the cuff pressure, the ideal deflation pressure value is taken as reference, the PWM value is dynamically adjusted according to the difference value of the actual pressure value and the ideal deflation pressure value at the current moment, the deflation speed is dynamically changed, and the actual deflation speed curve is approximate to a linear straight line. The specific regulation control method comprises the following steps:
firstly, according to different initial inflation cut-off pressures, a corresponding initial deflation PWM value is provided, a control coefficient gas _ radio _ global of global uniform deflation speed is set, and a control coefficient gas _ radio _ local of local uniform deflation speed is given according to the range of the current pressure.
Secondly, calculating the pulse amplitude value in the current deflation process, changing 10 points of the deflation PWM value when the pulse amplitude value is smaller than 1/5 of the pulse peak value acquired in the intelligent inflation process, slightly accelerating the deflation speed, and calculating the deflation speed Gas _ speed _ deflatat the next moment:
Gas_err＝mmHg_deflat_after-deflate_gas_before (1)
Gas_speed_deflat＝Gas_speed_deflat-gas_radio_global*(1+abs(Gas_err)*gas_radio_local) (2)
gas _ speed _ defllat + Gas _ radio _ global (1+ abs _ err) Gas _ radio _ local) (3), wherein Gas _ err is the pressure difference between after-deflation and before-deflation, Gas _ speed _ defllat is the deflation speed, Gas _ radio _ global is the control coefficient of the global uniform deflation speed, Gas _ radio _ local is the control coefficient of the local uniform deflation speed, abs (Gas _ err) is the absolute value of the pressure difference between after-deflation and before-deflation, mmHg _ defllat _ after is the deflation pressure, defllat _ Gas _ before is the deflation pressure, when the pulse is larger than 1/5 of the pulse peak value acquired in the intelligent inflation process, the deflation speed at the next moment is calculated according to the formula (1), (3) or (2);
thirdly, because the constant-speed air release is set, an ideal pressure air release curve can be obtained according to the air release speed and the current moment:
out_gas_seg_sample＝deflateGas_mmHg_deflat*deflate_gas_seg/Fs (4)
wherein out _ gas _ seg _ sample is a deflation curve under ideal pressure, deflateGas _ mmHg _ defllat and deflate _ gas _ seg are experimental empirical values; fs is the sampling rate.
If the current actual pressure mmHg _ deflat < deflate _ gas _ ini _ value-out _ gas _ seg _ sample, accelerating the deflation speed, and calculating the deflation speed at the next moment by using a formula (2);
if the current actual pressure mmHg _ deflat > deflate _ gas _ ini _ value + out _ gas _ seg _ sample, slowing down the deflation speed, and calculating the deflation speed at the next moment by using a formula (3);
if the current actual pressure mmHg _ deflat > - < ═ deflate _ Gas _ ini _ value-out _ Gas _ seg _ sample and mmHg _ deflate < - < ═ deflate _ Gas _ ini _ value + out _ Gas _ seg _ sample, the speed of Gas _ speed _ deflate at the previous moment is maintained unchanged; wherein the deflate _ gas _ ini _ value is the actual pressure at the previous time.
And finally, after detecting the pulse wave sequence meeting the regulation, quickly deflating, and simultaneously calculating the blood pressure value to finish the whole blood pressure measuring process.
On the basis of the above embodiment, in the blood pressure measuring method provided in the embodiment of the present invention, the increasing the deflation speed may cause the pressure inside the cuff to decrease rapidly, and accordingly, the magnitude of the pressure decrease inside the cuff includes: the pressure drop amplitude in the oversleeve is less than or equal to 10 mmHg/s. Too large amplitude of the abrupt change of the cuff pressure can cause the abrupt drop of the pressure in the cuff, thereby influencing the peak extraction of pulse waves, causing the increase of the fitting error of the subsequent pulse change trend, and finally influencing the calculation of the systolic pressure and the diastolic pressure, so that the value is 10 mmHg/s.
According to the blood pressure measuring method provided by the embodiment of the invention, the final inflation cut-off pressure value is obtained by comparing the two predicted inflation cut-off pressure values, then a reasonable initial pulse width modulation value is set for the final inflation cut-off pressure value, and then pulse width control modulation is carried out according to the deflation speed on the basis of the initial pulse width modulation value, so that the uniform linear deflation effect is realized, more accurate blood pressure measurement value is finally obtained, and the discomfort of a patient in the inflation process is relieved.
The technical effects of the embodiments of the present invention can be further understood in detail according to fig. 3, where fig. 3 includes: a constant deflation curve 301, a pulse curve 302 during constant deflation, a pulse curve 303 during step deflation and a step deflation curve 304. As can be seen from fig. 3, in the initial stage of deflation, since the detected pulse wave amplitude is small, the deflation speed is fast, which is shown in the constant deflation curve 301, it can be seen that the constant deflation curve 301 is steeper in the initial stage of deflation and the peak value reached is larger, which indicates that the acceleration is larger in the initial stage of deflation and a larger deflation speed is reached. When the pulse wave amplitude value is gradually increased, the pulse wave amplitude value is mainly reflected in 2000-6000 sections of the horizontal axis coordinate in the pulse curve 302 in the constant-speed deflation process, the deflation speed is reduced, the deflation speed difference of adjacent time points is small, the sudden change of the cuff pressure cannot be caused, and the interference signal of the deflation action cannot be caused. The deflation speed is controlled to be 3-5 mmhg/s, the deflation speed is consistent with the deflation speed required by the mercury pressure gauge for measuring deflation, pulse signals corresponding to systolic pressure and diastolic pressure cannot be lost due to sudden pressure change, the whole deflation process is carried out stably at a constant speed, each pulse signal in the deflation process is recorded completely, and great benefits are brought to improvement of pulse peak value fitting and pressure calculation accuracy used subsequently. For the pulse curve 303 and the step deflation curve 304 in the step deflation process, it can be seen that an overshoot signal (visible in the pulse curve 303 in the step deflation process) with a large peak value and a large trough is generated at the instant of each deflation, because the pressure in the cuff suddenly drops at the instant of deflation, the pressure process of pressure restoration balance in the cuff usually needs at least 3-5 seconds, so the step deflation measurement process usually takes a long time; and the deflation DC (direct current) pressure of each step can be reduced by 5-20 mmhg in the step deflation process, the deflation speed is averagely at least 10mmhg/s, when the deflation speed is too high, the deflation speed can cause that the deflation speed is really close to the pressure range corresponding to the systolic pressure and the diastolic pressure of the patient, the corresponding pulse wave is lost due to the too high deflation speed, and the finally calculated blood pressure value and the real value after pulse extraction and fitting are finally large in error.
The implementation basis of the various embodiments of the present invention is realized by programmed processing performed by a device having a processor function. Therefore, in engineering practice, the technical solutions and functions thereof of the embodiments of the present invention can be packaged into various modules. Based on this reality, on the basis of the above embodiments, embodiments of the present invention provide a blood pressure measurement device for performing the blood pressure measurement method in the above method embodiments. Referring to fig. 4, the apparatus includes:
a final inflation cut-off pressure value obtaining module 401, configured to obtain a pulse signal, increase a pressure value corresponding to a pulse amplitude by a first margin if the pulse amplitude is greater than a previous pulse amplitude and a next pulse amplitude, to obtain a first predicted inflation cut-off pressure value, continue to detect a change in the pulse amplitude, if a ratio of a current pulse amplitude to the pulse amplitude is smaller than a first threshold, use the pressure value corresponding to the current pulse amplitude as a second predicted inflation cut-off pressure value, and use the first predicted inflation cut-off pressure value or the second predicted inflation cut-off pressure value as a final inflation cut-off pressure value;
and a uniform linear deflation adjusting module 402, configured to set an initial pulse width modulation value according to the final inflation cut-off pressure value, and adjust the magnitude of the initial pulse width modulation value according to a pulse amplitude detected in real time, so as to implement uniform linear deflation.
The blood pressure measuring device provided by the embodiment of the invention adopts the final inflation cut-off pressure value obtaining module and the constant-speed linear deflation adjusting module, obtains the final inflation cut-off pressure value by comparing two predicted inflation cut-off pressure values, sets a reasonable initial pulse width modulation value aiming at the final inflation cut-off pressure value, and performs pulse width control modulation according to the deflation speed on the basis of the initial pulse width modulation value, thereby realizing the constant-speed linear deflation effect, finally obtaining a more accurate blood pressure measured value and reducing the discomfort of patients in the inflation process.
The method of the embodiment of the invention is realized by depending on the electronic equipment, so that the related electronic equipment is necessarily introduced. To this end, an embodiment of the present invention provides an electronic apparatus, as shown in fig. 5, including: at least one processor (processor)501, a communication Interface (Communications Interface)504, at least one memory (memory)502 and a communication bus 503, wherein the at least one processor 501, the communication Interface 504 and the at least one memory 502 are in communication with each other through the communication bus 503. The at least one processor 501 may call logic instructions in the at least one memory 502 to perform the following method: obtaining a pulse signal, if a pulse amplitude is greater than a previous pulse amplitude and a next pulse amplitude, increasing a pressure value corresponding to the pulse amplitude by a first margin to obtain a first predicted inflation cut-off pressure value, continuously detecting the change of the pulse amplitude, if the ratio of the current pulse amplitude to the pulse amplitude is less than a first threshold, taking the pressure value corresponding to the current pulse amplitude as a second predicted inflation cut-off pressure value, and taking the first predicted inflation cut-off pressure value or the second predicted inflation cut-off pressure value as a final inflation cut-off pressure value; and setting an initial pulse width modulation value according to the final inflation cut-off pressure value, and adjusting the size of the initial pulse width modulation value according to the pulse amplitude detected in real time to realize uniform-speed linear deflation.
Furthermore, the logic instructions in the at least one memory 502 may be implemented in software functional units and stored in a computer readable storage medium when sold or used as a stand-alone product. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. Examples include: obtaining a pulse signal, if a pulse amplitude is greater than a previous pulse amplitude and a next pulse amplitude, increasing a pressure value corresponding to the pulse amplitude by a first margin to obtain a first predicted inflation cut-off pressure value, continuously detecting the change of the pulse amplitude, if the ratio of the current pulse amplitude to the pulse amplitude is less than a first threshold, taking the pressure value corresponding to the current pulse amplitude as a second predicted inflation cut-off pressure value, and taking the first predicted inflation cut-off pressure value or the second predicted inflation cut-off pressure value as a final inflation cut-off pressure value; and setting an initial pulse width modulation value according to the final inflation cut-off pressure value, and adjusting the size of the initial pulse width modulation value according to the pulse amplitude detected in real time to realize uniform-speed linear deflation. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A blood pressure measuring device, comprising:
a final inflation cut-off pressure value obtaining module, configured to obtain a pulse signal, increase a pressure value corresponding to a pulse amplitude by a first margin if the pulse amplitude is greater than a previous pulse amplitude and a next pulse amplitude, to obtain a first predicted inflation cut-off pressure value, continue to detect a change in the pulse amplitude, and if a ratio of a current pulse amplitude to the pulse amplitude is smaller than a first threshold, use the pressure value corresponding to the current pulse amplitude as a second predicted inflation cut-off pressure value, and use the first predicted inflation cut-off pressure value or the second predicted inflation cut-off pressure value as a final inflation cut-off pressure value;
the constant-speed linear deflation adjusting module is used for setting an initial pulse width modulation value according to the final inflation cut-off pressure value, adjusting the size of the initial pulse width modulation value according to the pulse amplitude detected in real time and realizing constant-speed linear deflation;
the step of taking the first predicted inflation cutoff pressure value or the second predicted inflation cutoff pressure value as a final inflation cutoff pressure value includes:
and acquiring an arithmetic sum of the second predicted inflation cutoff pressure value and a second threshold value, if the first predicted inflation cutoff pressure value is larger than the arithmetic sum, taking the second predicted inflation cutoff pressure value as a final inflation cutoff pressure value, and if the first predicted inflation cutoff pressure value is smaller than or equal to the arithmetic sum, taking the first predicted inflation cutoff pressure value as a final inflation cutoff pressure value.
2. A blood pressure measuring device according to claim 1, wherein said acquiring a pulse signal comprises: and extracting pulse wave peak signals by adopting a band-pass filter and a difference method.
3. A blood pressure measuring device according to claim 1, wherein said setting an initial pulse width modulation value according to said final inflation cut-off pressure value comprises:
if the final inflation cut-off pressure value is larger than or equal to 250mmHg, setting an initial pulse width modulation value to be 3200 ms;
if the final inflation cut-off pressure value is larger than 200mmHg and smaller than 250mmHg, setting an initial pulse width modulation value to be 3150 ms;
if the final inflation cut-off pressure value is larger than 130mmHg and smaller than or equal to 200mmHg, setting an initial pulse width modulation value to 3100 ms;
if the final inflation cut-off pressure value is larger than 100mmHg and smaller than or equal to 130mmHg, setting an initial pulse width modulation value to be 3070 ms;
and if the final inflation cut-off pressure value is less than or equal to 100mmHg, setting the initial pulse width modulation value to be 3050 ms.
4. The blood pressure measuring device according to claim 1, wherein the adjusting the magnitude of the initial pulse width modulation value according to the pulse amplitude detected in real time to achieve uniform linear deflation comprises:
if the pulse amplitude detected in real time is smaller than a third threshold value, adjusting the initial pulse width modulation value and accelerating the deflation speed;
and if the pulse amplitude detected in real time is larger than or equal to a third threshold value, adjusting the initial pulse width modulation value and slowing down the deflation speed.
5. A blood pressure measuring device as claimed in claim 4, wherein said increased deflation rate causes a rapid decrease in the pressure within the cuff, and correspondingly the magnitude of the decrease in pressure within the cuff comprises:
the pressure drop amplitude in the oversleeve is less than or equal to 10 mmHg/s.
6. An electronic device, comprising:
at least one processor, at least one memory, a communication interface, and a bus; wherein the content of the first and second substances,
the processor, the memory and the communication interface complete mutual communication through the bus;
the memory stores program instructions executable by the processor, the processor invoking the program instructions to perform a blood pressure measurement method;
wherein, the blood pressure measuring method comprises the following steps:
obtaining a pulse signal, if a pulse amplitude is greater than a previous pulse amplitude and a next pulse amplitude, increasing a pressure value corresponding to the pulse amplitude by a first margin to obtain a first predicted inflation cut-off pressure value, continuously detecting the change of the pulse amplitude, if the ratio of the current pulse amplitude to the pulse amplitude is less than a first threshold, taking the pressure value corresponding to the current pulse amplitude as a second predicted inflation cut-off pressure value, and taking the first predicted inflation cut-off pressure value or the second predicted inflation cut-off pressure value as a final inflation cut-off pressure value;
setting an initial pulse width modulation value according to the final inflation cut-off pressure value, and adjusting the size of the initial pulse width modulation value according to the pulse amplitude detected in real time to realize uniform-speed linear deflation;
the step of taking the first predicted inflation cutoff pressure value or the second predicted inflation cutoff pressure value as a final inflation cutoff pressure value includes:
and acquiring an arithmetic sum of the second predicted inflation cutoff pressure value and a second threshold value, if the first predicted inflation cutoff pressure value is larger than the arithmetic sum, taking the second predicted inflation cutoff pressure value as a final inflation cutoff pressure value, and if the first predicted inflation cutoff pressure value is smaller than or equal to the arithmetic sum, taking the first predicted inflation cutoff pressure value as a final inflation cutoff pressure value.
7. The electronic device according to claim 6, wherein the blood pressure measurement method further includes: and extracting pulse wave peak signals by adopting a band-pass filter and a difference method.
8. The electronic device according to claim 6, wherein the blood pressure measurement method further includes: setting an initial pulse width modulation value according to the final inflation cut-off pressure value, wherein the setting comprises the following steps:
if the final inflation cut-off pressure value is larger than or equal to 250mmHg, setting an initial pulse width modulation value to be 3200 ms;
if the final inflation cut-off pressure value is larger than 200mmHg and smaller than 250mmHg, setting an initial pulse width modulation value to be 3150 ms;
if the final inflation cut-off pressure value is larger than 130mmHg and smaller than or equal to 200mmHg, setting an initial pulse width modulation value to 3100 ms;
if the final inflation cut-off pressure value is larger than 100mmHg and smaller than or equal to 130mmHg, setting an initial pulse width modulation value to be 3070 ms;
and if the final inflation cut-off pressure value is less than or equal to 100mmHg, setting the initial pulse width modulation value to be 3050 ms.
9. The electronic device according to claim 6, wherein in the blood pressure measuring method, the adjusting the magnitude of the initial pulse width modulation value according to the pulse amplitude detected in real time to achieve uniform linear deflation comprises:
if the pulse amplitude detected in real time is smaller than a third threshold value, adjusting the initial pulse width modulation value and accelerating the deflation speed;
if the pulse amplitude detected in real time is larger than or equal to a third threshold value, adjusting the initial pulse width modulation value, and slowing down the deflation speed;
wherein, said accelerating deflation speed will cause the pressure in the cuff to decrease rapidly, and correspondingly, the magnitude of the pressure decrease in the cuff includes:
the pressure drop amplitude in the oversleeve is less than or equal to 10 mmHg/s.
10. A non-transitory computer-readable storage medium storing computer instructions that cause a computer to perform a method of blood pressure measurement, wherein the method of blood pressure measurement comprises:
obtaining a pulse signal, if a pulse amplitude is greater than a previous pulse amplitude and a next pulse amplitude, increasing a pressure value corresponding to the pulse amplitude by a first margin to obtain a first predicted inflation cut-off pressure value, continuously detecting the change of the pulse amplitude, if the ratio of the current pulse amplitude to the pulse amplitude is less than a first threshold, taking the pressure value corresponding to the current pulse amplitude as a second predicted inflation cut-off pressure value, and taking the first predicted inflation cut-off pressure value or the second predicted inflation cut-off pressure value as a final inflation cut-off pressure value;
setting an initial pulse width modulation value according to the final inflation cut-off pressure value, and adjusting the size of the initial pulse width modulation value according to the pulse amplitude detected in real time to realize uniform-speed linear deflation;
the step of taking the first predicted inflation cutoff pressure value or the second predicted inflation cutoff pressure value as a final inflation cutoff pressure value includes:
and acquiring an arithmetic sum of the second predicted inflation cutoff pressure value and a second threshold value, if the first predicted inflation cutoff pressure value is larger than the arithmetic sum, taking the second predicted inflation cutoff pressure value as a final inflation cutoff pressure value, and if the first predicted inflation cutoff pressure value is smaller than or equal to the arithmetic sum, taking the first predicted inflation cutoff pressure value as a final inflation cutoff pressure value.
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| CN111839487B (en) * | 2020-06-18 | 2022-12-23 | 郑昕 | Blood pressure measuring system without air bag |
| CN114631795B (en) * | 2022-05-19 | 2022-08-12 | 天津工业大学 | Blood pressure tracking and detecting system |
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