CN106236057A - A kind of sphygomanometer and a kind of method detecting blood pressure - Google Patents

Abstract

The invention provides a kind of sphygomanometer and a kind of method detecting blood pressure, this sphygomanometer includes: cuff, inflation unit, detector unit, processor；Wherein, described inflation unit is all connected with described cuff with described detector unit；Described processor is connected with described detector unit；Described inflation unit is for inflating in described cuff；Described detector unit, for during described inflation unit is inflated in described cuff, detects the pressure in described cuff in real time, exports the pressure detected to described processor；Described processor pressure in the described cuff inputted according to described detector unit, determines pressure value.The invention provides a kind of sphygomanometer and a kind of method detecting blood pressure, it is possible to reduce the infringement that health is caused.

Description

Sphygmomanometer and method for detecting blood pressure

Technical Field

The invention relates to the technical field of medical instruments, in particular to a sphygmomanometer and a method for detecting blood pressure.

Background

Blood pressure refers to the lateral pressure, i.e., pressure, of blood within a blood vessel against a unit area of the blood vessel wall. That is, the hydrostatic pressure of blood in the vessel is the blood pressure. When measuring blood pressure, this can be done by a sphygmomanometer.

In a conventional blood pressure monitor, when measuring blood pressure, the cuff of the blood pressure monitor is inflated first, and when pulse is not detected at the cuff, the inflation of the cuff is stopped, then the cuff starts to be deflated, and as the air is gradually deflated from the cuff, the blood in the blood vessel at the cuff starts to flow, and from the deflation, the blood pressure is determined by detecting the oscillation wave in the cuff.

The existing sphygmomanometer starts to detect blood pressure after blood in a blood vessel stops flowing, and the blood in the blood vessel at a cuff is in an occlusion state for a long time, which causes great damage to a body.

Disclosure of Invention

The embodiment of the invention provides a sphygmomanometer and a method for detecting blood pressure, which can reduce damage to a body.

In a first aspect, an embodiment of the present invention provides a sphygmomanometer, including:

the device comprises a cuff, an inflation unit, a detection unit and a processor; wherein,

the inflation unit and the detection unit are both connected with the cuff;

the processor is connected with the detection unit;

the inflation unit is used for inflating the cuff;

the detection unit is used for detecting the pressure in the cuff in real time in the process of inflating the cuff by the inflation unit and outputting the detected pressure to the processor;

the processor is used for determining a blood pressure value according to the pressure in the cuff input by the detection unit.

Further, the processor is configured to determine a pressure waveform according to the pressure in the cuff input by the detection unit, and determine the blood pressure value according to the pressure waveform.

Further, the processor, when executing the determining the blood pressure value according to the pressure waveform, is configured to determine a pulse wave from the pressure waveform, determine a maximum amplitude of the pulse wave, and determine the blood pressure value according to the maximum amplitude of the pulse wave and the pressure waveform.

Further, when the processor determines the pulse wave from the pressure waveform, the processor is configured to transform the pressure waveform according to a formula to obtain a frequency domain expression of the pressure waveform, filter an interference wave in a preset frequency range from the pressure waveform according to the frequency domain expression of the pressure waveform, and obtain the pulse wave according to a pressure waveform with the interference wave filtered, where the first formula is:

$F\left(\mathrm{\ω}\right)=\underset{-\mathrm{\∞}}{\overset{\mathrm{\∞}}{\∫}}f\left(t\right)e^{-i\mathrm{\ω}t}dt,$

f (ω) is a frequency domain representation of the pressure waveform, and F (t) is a time domain representation of the pressure waveform.

Further, the processor, when performing the determining of the pulse wave from the pressure waveform, is configured to determine pulse wave bands with amplitudes within a preset amplitude range in all wave bands of the pressure waveform, determine a base waveform corresponding to each pulse wave band, and subtract the corresponding base waveform from each pulse wave band to obtain the pulse wave;

the wave band is a wave form between any two adjacent minimum value points in the pressure wave form, the amplitude of the wave band is the difference between the maximum value of the wave band and the previous minimum value of the wave band, the pulse wave band is a wave band with the amplitude within a preset amplitude range, and the basic wave form is a wave form of the pressure wave form when the pulse wave form is not superposed.

In a second aspect, an embodiment of the present invention provides a method for detecting blood pressure, including:

inflating a cuff fixed on the detected part;

detecting the pressure in the cuff in real time during inflation of the cuff;

determining a blood pressure value based on the detected pressure in the cuff.

Further, the determining a blood pressure value based on the detection of the pressure in the cuff includes:

and determining a pressure waveform according to the detected pressure in the cuff, and determining the blood pressure value according to the pressure waveform.

Further, the determining the blood pressure value from the pressure waveform includes:

determining a pulse wave from the pressure waveform, determining a maximum amplitude of the pulse wave, and determining the blood pressure value from the maximum amplitude of the pulse wave and the pressure waveform.

Further, the determining a pulse wave from the pressure waveform includes:

transforming the pressure waveform according to a formula to obtain a frequency domain expression of the pressure waveform;

filtering interference waves in the pressure waveform within a preset frequency range according to the frequency domain expression of the pressure waveform;

acquiring the pulse wave according to the pressure waveform of the filtered interference wave;

wherein, the first formula is:

$F\left(\mathrm{\ω}\right)=\underset{-\mathrm{\∞}}{\overset{\mathrm{\∞}}{\∫}}f\left(t\right)e^{-i\mathrm{\ω}t}dt,$

f (ω) is a frequency domain representation of the pressure waveform, and F (t) is a time domain representation of the pressure waveform.

Further, the determining a pulse wave from the pressure waveform includes:

determining a pulse wave band of which the amplitude is within a preset amplitude range in all wave bands of the pressure waveform;

determining a basic waveform corresponding to each pulse wave band;

subtracting the corresponding basic waveform from each pulse wave band to obtain the pulse wave;

the wave band is a wave form between any two adjacent minimum value points in the pressure wave form, the amplitude of the wave band is the difference between the maximum value of the wave band and the previous minimum value of the wave band, the pulse wave band is a wave band with the amplitude within a preset amplitude range, and the basic wave form is a wave form of the pressure wave form when the pulse wave form is not superposed.

In the embodiment of the invention, the detection unit detects the pressure in the cuff in real time in the process of inflating the cuff by the inflation unit, the processor determines the blood pressure value according to the pressure in the cuff detected by the detection unit, namely, the blood pressure detection can be realized according to the pressure in the process of inflating the cuff, and after the current detection unit acquires the required data, the cuff can be removed from the detected part or the cuff can be deflated quickly, so that the blocking time of the cuff on the blood vessel of the detected part is shortened, and the damage to the body is reduced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, 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 schematic view of a sphygmomanometer provided in one embodiment of the present invention;

FIG. 2 is a schematic view of another sphygmomanometer provided in one embodiment of the present invention;

FIG. 3 is a schematic diagram of a pressure waveform provided by an embodiment of the present invention;

FIG. 4 is a schematic illustration of another pressure waveform provided by an embodiment of the present invention;

FIG. 5 is a schematic view of yet another sphygmomanometer provided in accordance with one embodiment of the present invention;

FIG. 6 is a flow chart of a method for detecting blood pressure according to an embodiment of the present invention;

fig. 7 is a flowchart of another method for detecting blood pressure 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 and more complete, the technical solutions in the embodiments of the present invention will be 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, and based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the scope of the present invention.

As shown in fig. 1, an embodiment of the present invention provides a sphygmomanometer, including:

a cuff 101, an inflation unit 102, a detection unit 103, and a processor 104; wherein,

the inflation unit 102 and the detection unit 103 are both connected with the cuff 101;

the processor 104 is connected with the detection unit 103;

the inflation unit 102 is used for inflating the cuff 101;

the detection unit 103 is configured to detect a pressure in the cuff 101 in real time during inflation of the cuff 101 by the inflation unit 102, and output the detected pressure to the processor 104;

the processor 104 is configured to determine a blood pressure value according to the pressure in the cuff input by the detection unit 103.

In the embodiment of the invention, the detection unit detects the pressure in the cuff in real time in the process of inflating the cuff by the inflation unit, the processor determines the blood pressure value according to the pressure in the cuff detected by the detection unit, namely, the blood pressure detection can be realized according to the pressure in the process of inflating the cuff, and after the current detection unit acquires the required data, the cuff can be removed from the detected part or the cuff can be deflated quickly, so that the blocking time of the cuff on the blood vessel of the detected part is shortened, and the damage to the body is reduced.

In an embodiment of the present invention, the processor is configured to determine a pressure waveform according to the pressure in the cuff input by the detection unit, and determine the blood pressure value according to the pressure waveform.

In this embodiment, the pressure waveform may be determined by the processor from the pressure and time. For example, the processor receives a pressure of 20mmHg at the time of the 1 st second, a pressure of 30mmHg at the time of the 2 nd second, … …, and a pressure of N mmHg at the time of the N-th second, and generates a pressure waveform with time on the horizontal axis and the vertical axis.

In an embodiment of the present invention, the detecting unit may be a pressure sensor, and the pressure sensor is connected to the processor. The inflation unit may be an air pump.

As shown in fig. 2, the present invention provides a sphygmomanometer, comprising:

a cuff 101, an air pump 201, a pressure sensor 202 and a processor 104.

The working process of the sphygmomanometer in the embodiment of the invention is as follows:

fixing the cuff on the detected part;

inflating the cuff with the air pump;

in the process that the air pump inflates the cuff, the pressure sensor is used for detecting the pressure in the cuff in real time, and the detected pressure is output to the processor;

and determining a pressure waveform according to the pressure input by the pressure sensor by using the processor, and determining the blood pressure value according to the pressure waveform.

In order to more accurately detect the blood pressure value, in an embodiment of the invention, the processor, when executing the determining the blood pressure value according to the pressure waveform, is configured to determine a pulse wave from the pressure waveform, determine a maximum amplitude of the pulse wave, and determine the blood pressure value according to the maximum amplitude of the pulse wave and the pressure waveform.

In this embodiment, as the cuff is inflated, the tighter the cuff is in contact with the detected part, the stronger the amplitude of the pulse wave is, when the cuff reaches a certain pressure, the amplitude of the pulse wave reaches the maximum, and then the cuff is inflated continuously, so that the cuff further compresses the detected part, so that the blood vessel is gradually blocked, and the amplitude of the pulse wave becomes smaller, and when the pressure of the cuff reaches a certain value (generally, 30 to 50mmHg higher than systolic pressure), the blood vessel is completely blocked, and the amplitude of the pulse wave is 0. Selecting the moment with the maximum amplitude as a reference point, based on the point, searching a point with the amplitude being a times of the maximum amplitude forward, wherein the pressure corresponding to the point is diastolic pressure, searching a point with the amplitude being b times of the maximum amplitude backward, wherein the pressure corresponding to the point with the maximum fluctuation is systolic pressure, and the pressure corresponding to the point with the highest fluctuation is average pressure, wherein a belongs to (0.3, 0.8), and b belongs to (0.4, 0.9), specific values can be determined empirically, or can be determined after testing the current sphygmomanometer, for example, a is 0.45, and b is 0.75.

In order to make the determined pulse wave more accurate, the pressure waveform can be processed by Fourier analysis to remove the interference wave.

In an embodiment of the present invention, when the processor determines a pulse wave from the pressure waveform, the processor is configured to transform the pressure waveform according to a formula to obtain a frequency domain expression of the pressure waveform, filter an interference wave in a preset frequency range from the pressure waveform according to the frequency domain expression of the pressure waveform, and obtain the pulse wave according to the pressure waveform with the interference wave filtered, where the first formula is:

$F\left(\mathrm{\ω}\right)=\underset{-\mathrm{\∞}}{\overset{\mathrm{\∞}}{\∫}}f\left(t\right)e^{-i\mathrm{\ω}t}dt,$

f (ω) is a frequency domain representation of the pressure waveform, and F (t) is a time domain representation of the pressure waveform.

In the present embodiment, the pressure waveform in the time domain is converted into the frequency domain by formula one, and the interference wave is removed in the frequency domain. The interference wave may be generated by an inflation unit for inflating when inflating the cuff, for example, the inflation unit is an air pump, and the vibration of the air pump may form the interference wave in the cuff, which may make the determined pulse wave inaccurate and may be interfered by the interference wave. In this embodiment, after the interference wave is removed according to the formula one, the pulse wave is obtained, and the obtained pulse wave is more accurate, so that the measured blood pressure value is more accurate.

In addition, in order to make the determined pulse wave more accurate, in an embodiment of the present invention, when the determining of the pulse wave from the pressure waveform is performed, the processor is configured to determine pulse wave bands with amplitudes within a preset amplitude range in all wave bands of the pressure waveform, determine a base waveform corresponding to each pulse wave band, and subtract the corresponding base waveform from each pulse wave band to obtain the pulse wave;

the wave band is a wave form between any two adjacent minimum value points in the pressure wave form, the amplitude of the wave band is the difference between the maximum value of the wave band and the previous minimum value of the wave band, the pulse wave band is a wave band with the amplitude within a preset amplitude range, and the basic wave form is a wave form of the pressure wave form when the pulse wave form is not superposed.

For example, when the inflation unit inflates the cuff, the inflation unit inflates the cuff at a constant speed, for example, the inflation unit is an air pump, and a pressure curve of the pressure in the cuff is as shown in fig. 3, in which time is a horizontal axis and the pressure is a vertical axis. As can be seen from the figure, the basic waveform of the pressure waveform is an oblique line, and after the pulse wave is superimposed, a pulse wave band appears on the pressure waveform. In the figure, a point A and a point B are two adjacent minimum value points, a wave band AB is arranged between the point A and the point B, a point C is a maximum value point of the wave band AB, the difference between the pressure value of the point C and the pressure value of the point A is the amplitude of the wave band AB, and the wave band AB is a pulse wave band. The base waveform AB corresponding to the band AB obtained by connecting the point a and the point B with a straight line, as shown by the dotted line in fig. 3, is a part of the pulse wave obtained by subtracting the base waveform AB from the band AB.

When the cuff is inflated by the inflation unit, the cuff is not inflated at a constant speed, for example, the inflation unit is a rubber ball, and the cuff is inflated by pressing the rubber ball. The pressure curve of the pressure in the cuff is shown in figure 4. As can be seen from the figure, the basic waveform of the pressure waveform is a periodic curve, and after the pulse wave is superimposed, certain parts of the curve can present pulse wave bands. Points D and E in the graph are two adjacent minimum value points, a waveband DE is arranged between the points D and E, a point F is a maximum value point of the waveband DE, and the difference between the pressure value of the point F and the pressure value of the point D is the amplitude of the waveband DE. In the figure, a point G and a point H are two adjacent minimum value points, a waveband GH is arranged between the point G and the point H, a point J is a maximum value point of the waveband GH, the difference between the pressure value of the point J and the pressure value of the point G is the amplitude of the waveband GH, and the waveband GH is a pulse waveband. The corresponding base waveform can be restored at the wavelength band GH according to the periodicity of the base waveform, as shown by the dotted line GIH. In addition, the base waveform corresponding to the pulse band can also be determined by: determining a front maximum value point F and a rear maximum value point K of a wave band GH, determining corner points M of a straight line FG and a straight line KH, and connecting GM and MH, wherein the GM and MH form a basic waveform corresponding to a pulse wave band GH.

The embodiment of the invention can be used in combination with the embodiment of removing the interference wave by using the formula I, specifically, the processor filters the interference wave in the pressure waveform within the preset frequency range to obtain the pressure waveform with the interference wave filtered.

In an embodiment of the present invention, the method further includes: the detection unit is connected with the inflation unit;

when the detection unit detects that the pressure in the cuff is greater than or equal to a preset value, a signal for stopping inflation is sent to the inflation unit;

and the inflating unit stops inflating the cuff after receiving the inflation stopping signal.

In the embodiment, the preset value can be set empirically, and for example, the preset value can be greater than the systolic pressure by 30-50 mmHg. Through this embodiment, can in time stop to the cuff inflation as required, avoid causing great damage to the position surveyed.

As shown in fig. 5, an embodiment of the present invention provides a sphygmomanometer, including:

the cuff 101, the air pump 201, the pressure sensor 202, the processor 104 and the air release unit 501;

the air release unit 501 is connected with the cuff 101;

the deflation unit 501 is used for deflating the gas in the cuff 101.

In the embodiment, the air in the cuff can be rapidly discharged through the air discharging unit, so that the damage to the detected part is reduced. The air release unit may be an air valve provided on the cuff. The deflation unit can be connected with the processor and is controlled to deflate when the pressure received by the processor reaches a preset pressure value.

The working process of the sphygmomanometer provided by the embodiment of the invention is as follows:

fixing the cuff on the detected part;

inflating the cuff by using an air pump;

in the process that the inflating unit inflates the cuff, the pressure sensor is used for detecting the pressure in the cuff in real time, and the detected pressure is output to the processor;

determining a pressure waveform by a processor according to the pressure input by the pressure sensor;

transforming the pressure waveform according to a formula to obtain a frequency domain expression of the pressure waveform;

filtering interference waves in a preset frequency range in the pressure waveform according to a frequency domain expression of the pressure waveform;

determining a pulse wave band with amplitude within a preset amplitude range in all wave bands of the pressure waveform with the interference waves filtered;

determining a basic waveform corresponding to each pulse wave band;

subtracting the corresponding basic waveform from each pulse wave band to obtain the pulse wave;

determining the maximum amplitude of the pulse wave, and determining the blood pressure value according to the maximum amplitude of the pulse wave and the pressure waveform.

The wave band is a wave band between any two adjacent minimum value points in the pressure wave band for filtering the interference wave, the amplitude of the wave band is the difference between the maximum value of the wave band and the previous minimum value of the wave band, the pulse wave band is a wave band with the amplitude within a preset amplitude range, and the basic wave band is a wave band of the pressure wave band for filtering the interference wave when the pulse wave is not superposed.

As shown in fig. 6, an embodiment of the present invention provides a method for detecting blood pressure, including:

step 601: inflating a cuff fixed on the detected part;

step 602: detecting the pressure in the cuff in real time during inflation of the cuff;

step 603: determining a blood pressure value based on the detected pressure in the cuff.

In an embodiment of the present invention, the determining a blood pressure value according to the detected pressure in the cuff includes:

and determining a pressure waveform according to the detected pressure in the cuff, and determining the blood pressure value according to the pressure waveform.

In this embodiment, each detected pressure has a corresponding time, time and pressure to form a pressure point, and all pressure points are formed into a pressure waveform. Specifically, the pressure waveform may be generated with time as the horizontal axis and pressure as the vertical axis.

In order to more accurately detect the blood pressure value, in an embodiment of the present invention, the determining the blood pressure value according to the pressure waveform includes:

determining a pulse wave from the pressure waveform, determining a maximum amplitude of the pulse wave, and determining the blood pressure value from the maximum amplitude of the pulse wave and the pressure waveform.

The determined pressure waveform may have interfering waves in addition to the base waveform and pulse wave formed for cuff inflation, such as: the air pump is inflated to generate interference waves. In order to make the determined pulse wave more accurate, the interference wave in the pressure waveform may be removed by the following embodiment.

In an embodiment of the present invention, the determining the pulse wave from the pressure waveform includes:

transforming the pressure waveform according to a formula to obtain a frequency domain expression of the pressure waveform;

filtering interference waves in the pressure waveform within a preset frequency range according to the frequency domain expression of the pressure waveform;

acquiring the pulse wave according to the pressure waveform of the filtered interference wave;

wherein, the first formula is:

$F\left(\mathrm{\ω}\right)=\underset{-\mathrm{\∞}}{\overset{\mathrm{\∞}}{\∫}}f\left(t\right)e^{-i\mathrm{\ω}t}dt,$

f (ω) is a frequency domain representation of the pressure waveform, and F (t) is a time domain representation of the pressure waveform.

The frequencies of the pulse wave and the basic waveform for inflating the cuff can be obtained by experiments or experiences in a corresponding frequency range, the waveform out of the frequency range can be determined as the interference wave, and the frequency of the interference wave can be specified by a preset frequency range, and the preset frequency range can be determined according to the frequency range corresponding to the pulse wave and the basic waveform. For example, the frequency range corresponding to the basic waveform is 20-40Hz, and the frequency of the pulse wave is 1-5Hz, then the frequency range outside the two ranges can be determined as the preset frequency range.

In order to make the determined pulse wave more accurate, in an embodiment of the present invention, the determining the pulse wave from the pressure waveform includes:

determining a pulse wave band of which the amplitude is within a preset amplitude range in all wave bands of the pressure waveform;

determining a basic waveform corresponding to each pulse wave band;

subtracting the corresponding basic waveform from each pulse wave band to obtain the pulse wave;

the wave band is a wave form between any two adjacent minimum value points in the pressure wave form, the amplitude of the wave band is the difference between the maximum value of the wave band and the previous minimum value of the wave band, the pulse wave band is a wave band with the amplitude within a preset amplitude range, and the basic wave form is a wave form of the pressure wave form when the pulse wave form is not superposed.

The implementation of this embodiment can be seen in fig. 3 and 4.

The embodiment of the invention can be used in combination with the embodiment of removing the interference waves by using the formula I, specifically, the pressure waveform of the interference waves is obtained after the interference waves in the pressure waveform within the preset frequency range are filtered, the pressure waveform of the interference waves is processed by the embodiment to obtain the pulse waves, and the two embodiment modes are combined for use, so that the accuracy of the obtained pulse waves can be further improved, and further more accurate blood pressure values can be obtained.

As shown in fig. 7, a method for detecting blood pressure according to an embodiment of the present invention includes:

step 701: inflating a cuff fixed on the detected part;

specifically, the cuff can be inflated at a constant speed by the air pump.

Step 702: detecting the pressure in the cuff in real time during the inflation of the cuff;

in particular, the pressure in the cuff may be detected by a pressure sensor.

Step 703: based on the detected pressure in the cuff, a pressure waveform is determined.

Specifically, when the air pump inflates the cuff at a constant speed, the pressure waveform is a slope and rises at a constant speed with time without other interference. When the pulse wave is superimposed, some parts of the oblique line show a convex waveform, and the convex waveform is caused by the pulse wave. The pressure waveform may be interfered by the vibration of the air pump, and the interference wave may be superimposed on the pressure waveform, so that the finally obtained pressure waveform may be complicated.

Step 704: and transforming the pressure waveform according to a formula to obtain a frequency domain expression of the pressure waveform.

Different waves have specific corresponding frequency ranges, in order to filter interference waves, a frequency domain expression of the pressure waveform can be obtained through Fourier transform, the frequency domain waveform of the pressure waveform is determined through the frequency domain expression, the interference waves in the preset frequency range are filtered, and the pressure waveform of the filtered interference waves is obtained.

Step 705: and filtering the interference waves in the pressure waveform within a preset frequency range according to the frequency domain expression of the pressure waveform.

After the interference wave is filtered, the pressure waveform of the filtered interference wave is only the superposition of the pulse wave and the basic waveform, so that the subsequent determination of the pulse wave is facilitated. Under the condition that the air pump inflates air into the cuff at a constant speed, the pressure waveform for filtering the interference waves is the superposition of an oblique line and pulse waves.

Step 706: and determining a pulse wave band of which the amplitude is within a preset amplitude range in all wave bands of the pressure waveform of which the interference wave is filtered.

The wave band is a wave form between any two adjacent minimum value points in the pressure wave form for filtering the interference wave, the amplitude of the wave band is the difference between the maximum value of the wave band and the previous minimum value of the wave band, and the pulse wave band is the wave band of which the amplitude is within a preset amplitude range.

The amplitude of the base waveform formed by the inflation is generally relatively stable with a range of amplitudes that can be experimentally or empirically derived. A waveform not within the amplitude range may be determined as a pulse wave, and an amplitude range other than the amplitude range corresponding to the base waveform may be set as a preset amplitude range. For example, the amplitude range of the basic waveform is 30-50 mmHg, and the predetermined amplitude range may be an amplitude range other than 30-50 mmHg.

Step 707: a base waveform corresponding to each pulse band is determined.

And the basic waveform is the waveform of the pressure waveform without the superimposed pulse wave of the interference wave.

The basic waveform is a waveform caused by inflating the cuff, and for example, when the cuff is inflated at a constant speed, the basic waveform is a diagonal line. The process of inflating the cuff is generally regular, as are all the base waveforms. The basic waveform corresponding to each pulse wave segment can be determined according to the rule of the basic waveform, for example: the basic waveform is periodic, and in a period of time just after the pressure waveform starts, the pressure in the cuff is small, the cuff is in loose contact with the detected part, the pulse wave cannot be detected, and the rule of the basic waveform can be determined according to the pressure waveform in the period of time. In particular, see fig. 3 and 4.

Step 708: and subtracting the corresponding basic waveform from each pulse wave band to obtain the pulse wave.

Step 709: the maximum amplitude of the pulse wave is determined, and the blood pressure value is determined according to the maximum amplitude of the pulse wave and the pressure waveform.

Specifically, the time when the amplitude of the pulse wave is maximum is selected as a reference point, on the basis of the point, a point where the amplitude of the pulse wave is a times of the maximum amplitude is searched forward, the pressure corresponding to the point is diastolic pressure, a point where the amplitude of the pulse wave is b times of the maximum amplitude is searched backward, the pressure corresponding to the point is systolic pressure, and the pressure corresponding to the point with the highest fluctuation is average pressure, wherein a belongs to (0.3, 0.8), and b belongs to (0.4, 0.9), specific values can be determined empirically, or can be determined after a test is performed on a current sphygmomanometer, for example, a is 0.45, and b is 0.75.

The method provided by the embodiment of the invention can be realized by any sphygmomanometer in the embodiment.

The embodiments of the invention have at least the following beneficial effects:

1. in the embodiment of the invention, the detection unit detects the pressure in the cuff in real time in the process of inflating the cuff by the inflation unit, the processor determines the blood pressure value according to the pressure in the cuff detected by the detection unit, namely, the blood pressure detection can be realized according to the pressure in the process of inflating the cuff, and after the current detection unit acquires the required data, the cuff can be removed from the detected part or the cuff can be deflated quickly, so that the blocking time of the cuff on the blood vessel of the detected part is shortened, and the damage to the body is reduced.

2. In the embodiment of the invention, the pressure waveform in the time domain is converted into the frequency domain through the formula I, and the interference wave is removed in the frequency domain. The interference wave may be generated by an inflation unit for inflating when inflating the cuff, for example, the inflation unit is an air pump, and the vibration of the air pump may form the interference wave in the cuff, which may make the determined pulse wave inaccurate and may be interfered by the interference wave. In the embodiment of the invention, after the interference wave is removed by the formula I, the pulse wave is acquired, the acquired pulse wave is more accurate, and the measured blood pressure value is more accurate.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a" does not exclude the presence of other similar elements in a process, method, article, or apparatus that comprises the element.

Those of ordinary skill in the art will understand that: all or part of the steps for realizing the method embodiments can be completed by hardware related to program instructions, the program can be stored in a computer readable storage medium, and the program executes the steps comprising the method embodiments when executed; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.

Finally, it is to be noted that: the above description is only a preferred embodiment of the present invention, and is only used to illustrate the technical solutions of the present invention, and not to limit the protection scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.

Claims (10)

1. A sphygmomanometer, comprising:

the device comprises a cuff, an inflation unit, a detection unit and a processor; wherein,

the inflation unit and the detection unit are both connected with the cuff;

the processor is connected with the detection unit;

the inflation unit is used for inflating the cuff;

the detection unit is used for detecting the pressure in the cuff in real time in the process of inflating the cuff by the inflation unit and outputting the detected pressure to the processor;

the processor is used for determining a blood pressure value according to the pressure in the cuff input by the detection unit.

2. The sphygmomanometer according to claim 1,

the processor is used for determining a pressure waveform according to the pressure in the cuff input by the detection unit and determining the blood pressure value according to the pressure waveform.

3. A sphygmomanometer according to claim 2,

the processor is used for determining pulse waves from the pressure waveforms, determining the maximum amplitude of the pulse waves and determining the blood pressure value according to the maximum amplitude of the pulse waves and the pressure waveforms when the blood pressure value is determined according to the pressure waveforms.

4. A sphygmomanometer according to claim 3,

the processor is configured to, when the pulse wave is determined from the pressure waveform, transform the pressure waveform according to a formula to obtain a frequency domain expression of the pressure waveform, filter an interference wave in a preset frequency range from the pressure waveform according to the frequency domain expression of the pressure waveform, and obtain the pulse wave according to a pressure waveform with the interference wave filtered, where the first formula is:

$F\left(\mathrm{\ω}\right)=\underset{-\mathrm{\∞}}{\overset{\mathrm{\∞}}{\∫}}f\left(t\right)e^{-i\mathrm{\ω}t}dt,$

f (ω) is a frequency domain representation of the pressure waveform, and F (t) is a time domain representation of the pressure waveform.

5. A sphygmomanometer according to claim 3,

the processor is used for determining pulse wave bands with amplitudes within a preset amplitude range in all wave bands of the pressure waveform when the pulse wave is determined from the pressure waveform, determining a basic waveform corresponding to each pulse wave band, and subtracting the corresponding basic waveform from each pulse wave band to obtain the pulse wave;

the wave band is a wave form between any two adjacent minimum value points in the pressure wave form, the amplitude of the wave band is the difference between the maximum value of the wave band and the previous minimum value of the wave band, the pulse wave band is a wave band with the amplitude within a preset amplitude range, and the basic wave form is a wave form of the pressure wave form when the pulse wave form is not superposed.

6. A method of detecting blood pressure, comprising:

inflating a cuff fixed on the detected part;

detecting the pressure in the cuff in real time during inflation of the cuff;

determining a blood pressure value based on the detected pressure in the cuff.

7. The method of claim 6,

the determining a blood pressure value from detecting a pressure in the cuff comprises:

and determining a pressure waveform according to the detected pressure in the cuff, and determining the blood pressure value according to the pressure waveform.

8. The method of claim 7,

the determining the blood pressure value from the pressure waveform includes:

determining a pulse wave from the pressure waveform, determining a maximum amplitude of the pulse wave, and determining the blood pressure value from the maximum amplitude of the pulse wave and the pressure waveform.

9. The method of claim 8,

the determining a pulse wave from the pressure waveform includes:

transforming the pressure waveform according to a formula to obtain a frequency domain expression of the pressure waveform;

filtering interference waves in the pressure waveform within a preset frequency range according to the frequency domain expression of the pressure waveform;

acquiring the pulse wave according to the pressure waveform of the filtered interference wave;

wherein, the first formula is:

$F\left(\mathrm{\ω}\right)=\underset{-\mathrm{\∞}}{\overset{\mathrm{\∞}}{\∫}}f\left(t\right)e^{-i\mathrm{\ω}t}dt,$

f (ω) is a frequency domain representation of the pressure waveform, and F (t) is a time domain representation of the pressure waveform.

10. The method of claim 8,

the determining a pulse wave from the pressure waveform includes:

determining a pulse wave band of which the amplitude is within a preset amplitude range in all wave bands of the pressure waveform;

determining a basic waveform corresponding to each pulse wave band;

subtracting the corresponding basic waveform from each pulse wave band to obtain the pulse wave;

the wave band is a wave form between any two adjacent minimum value points in the pressure wave form, the amplitude of the wave band is the difference between the maximum value of the wave band and the previous minimum value of the wave band, the pulse wave band is a wave band with the amplitude within a preset amplitude range, and the basic wave form is a wave form of the pressure wave form when the pulse wave form is not superposed.