CN109805918A - A kind of equipment based on annular multipoint pressure measurement pulse wave - Google Patents
A kind of equipment based on annular multipoint pressure measurement pulse wave Download PDFInfo
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- CN109805918A CN109805918A CN201811626745.3A CN201811626745A CN109805918A CN 109805918 A CN109805918 A CN 109805918A CN 201811626745 A CN201811626745 A CN 201811626745A CN 109805918 A CN109805918 A CN 109805918A
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Abstract
This application provides a kind of equipment based on annular multipoint pressure measurement pulse wave, which includes: shell；Multiple axis, setting on the housing, are provided with a piezoelectric transducer on each axis, the piezoelectric transducer is used to measure the variation of skin pressure when heart pumps blood every time；Acceleration sensor circuit, setting is in the enclosure interior, the motion state of subject for identification.Using technical solution provided by the embodiments of the present application, it can be handled using different processing modes for stationary state and motion state, can satisfy the demand accurately measured under stationary state and motion state.
Description
Technical field
The application belongs to a kind of survey of pulse wave under physiological signal measurements equipment technical field more particularly to motion state
Measure equipment.
Background technique
Existing pulse measurement device is only limitted to measurement heart rate and the original data record of pulse does not get off, however,
The record of initial data has important role to the analysis of subsequent HRV etc..
And current pulse measurement device needs could complete to measure in the state that subject be in tranquillization (such as: the heart
Electrograph measurement), it after subject needs to carry out certain rest, just can be carried out accurate measurement, be unable to test and moving
Normal pulse state under state.
In view of the above-mentioned problems, currently no effective solution has been proposed.
Summary of the invention
The application is designed to provide a kind of equipment based on annular multipoint pressure measurement pulse wave, may be implemented to move
Pulses measure under state.
The application provide it is a kind of based on annular multipoint pressure measurement pulse wave equipment be achieved in that
A kind of equipment based on annular multipoint pressure measurement pulse wave, comprising:
Shell；
Multiple axis, setting on the housing, are provided with a piezoelectric transducer on each axis, the piezoelectric transducer is used
The variation of skin pressure when measuring heart and pumping blood every time；
Acceleration sensor circuit, setting is in the enclosure interior, the motion state of subject for identification.
In one embodiment, there is an axle position to remove in center, the multiple axis in the multiple axis to be located at
The axis that axis except center surrounds positioned at center is arranged.
In one embodiment, the distance between the axis in addition to being located at center and the axis for being located at center are big
In equal to 8mm.
In one embodiment, it is integrated with filtering and amplifying circuit in the shell, ADC conversion circuit, power circuit, adds
Speed processing circuit and wireless radio frequency circuit.
In one embodiment, the shell is what bendable material was fabricated to.
In one embodiment, each axis is higher than the shell preset height in the multiple axis.
In one embodiment, the side that the shell is adjacent to subject's skin is provided with double-sided adhesive.
In one embodiment, double-sided adhesive shapes and sizes same as the shell.
In one embodiment, 3-10 axis is provided in the shell of the pulse measurement device.
In one embodiment, the piezoelectric transducer is the piezoelectric transducer of sheet.
Equipment provided by the present application based on annular multipoint pressure measurement pulse wave passes through setting acceleration transducer electricity
Road, so as to identify whether subject is kept in motion, because being provided with multiple axis for being provided with piezoelectric transducer, thus
It can be handled, be can satisfy under stationary state and motion state using different processing modes for stationary state and motion state
The demand accurately measured.
Detailed description of the invention
In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The some embodiments recorded in application, for those of ordinary skill in the art, in the premise of not making the creative labor property
Under, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is the bottom view of the equipment provided by the present application based on annular multipoint pressure measurement pulse wave；
Fig. 2 is the side view of the equipment provided by the present application based on annular multipoint pressure measurement pulse wave；
Fig. 3 is the axis of piezoelectric transducer in the equipment provided by the present application based on annular multipoint pressure measurement pulse wave
Schematic diagram；
Fig. 4 is the actual use pressure conduction of the equipment provided by the present application based on annular multipoint pressure measurement pulse wave
Schematic diagram；
Fig. 5 is spurious peaks schematic diagram provided by the present application；
Fig. 6 is the waveform diagram of initial filter provided by the present application；
Fig. 7 is the waveform diagram provided by the present application for filtering out spurious peaks.
Specific embodiment
In order to make those skilled in the art better understand the technical solutions in the application, below in conjunction with the application reality
The attached drawing in example is applied, the technical scheme in the embodiment of the application is clearly and completely described, it is clear that described implementation
Example is merely a part but not all of the embodiments of the present application.Based on the embodiment in the application, this field is common
The application protection all should belong in technical staff's every other embodiment obtained without creative efforts
Range.
In view of existing electronic sphygmograph cannot achieve pulse signal of the measured under motion state, for this purpose, at this
A kind of equipment based on annular multipoint pressure measurement pulse wave is provided in example, may include:
1) shell；
2) multiple axis, setting on the housing, are provided with a piezoelectric transducer, the piezoelectric transducer on each axis
For measuring the variation of skin pressure when heart pumps blood every time；
3) acceleration sensor circuit, setting is in the enclosure interior, the motion state of subject for identification.
That is, by setting acceleration sensor circuit, so as to identify whether subject is kept in motion, because setting
Multiple axis for being provided with piezoelectric transducer are set, so that different processing modes can be used for stationary state and motion state
Processing, can satisfy the demand accurately measured under stationary state and motion state.
When specific setting, there can be an axis to remove in center, multiple axis in above-mentioned multiple axis
The axis that axis except center surrounds positioned at center is arranged.That is, an axis is arranged at center, in central axis week
It encloses and other axis is set again.When setting, can use by central axis to be arranged in a manner of axisymmetric.
For example, one shares 5 axis, then can centered on center is arranged one axis, remaining four according in
Around the centrally disposed axis of the symmetrical mode of mandrel.Specifically, the quantity of axis can be all arranged with cost according to actual needs,
The application is not construed as limiting this, for example, setting are as follows: 3,4,5,7,10 etc. are ok, can be according to actual needs
Selection.
When practical application, it is above-mentioned except be located at center in addition to axis and between the axis of center away from
From can be set to be more than or equal to 8mm, take 8-20mm.
In order to enable can should effectively be worked based on the equipment of annular multipoint pressure measurement pulse wave, in above-mentioned shell also
Filtering and amplifying circuit, ADC conversion circuit, power circuit, acceleration processing circuit and wireless radio frequency circuit are can integrate.
In view of that should be to need to be placed on based on the equipment of annular multipoint pressure measurement pulse wave when practical application
It is used on the arm of user, in order to may be implemented effectively to measure, above-mentioned shell is what bendable material was fabricated to, is made in this way
With when, can be bent to place in a manner of subject's arm.
In order to enable each piezoelectric transducer can touch skin well, and have faint pressure output, multiple axis
In each axis can be higher than shell preset height and be arranged, for example, be higher by 0.5mm etc., be more advantageous in this way and skin attachement.
Specifically, double-sided adhesive has can be set in the side that above-mentioned shell is adjacent to subject's skin, used in this way in subject
When, the protective layer of double-sided adhesive is opened, the test position of oneself is attached to, can be made based on annular multipoint pressure measurement
The equipment of pulse wave and subject are snugly more close.Wherein, double-sided adhesive can be shapes and sizes same as shell.
Above-mentioned piezoelectric transducer can be, but not limited to be sheet piezoelectric transducer.
Based on the above-mentioned equipment based on annular multipoint pressure measurement pulse wave, pulse can be carried out as follows
Measurement:
Step 1: receiving measurement sign on；
Step 2: in response to the measurement sign on, being obtained according to preset sample frequency each in multiple piezoelectric transducers
The pressure data of piezoelectric transducer；
Step 3: the pressure data of each piezoelectric transducer being quantified, and the pressure data after quantization is carried out
Storage；
Step 4: acquisition acceleration information determines whether subject is kept in motion according to the acceleration information；
Step 5: according to the state of pressure data and the subject after the quantization, determining the arteries and veins of the subject
It fights waveform.
Specifically, above-mentioned steps 4 acquire acceleration information, determine whether subject is in fortune according to the acceleration information
Dynamic state may include:
S1: the acceleration information of X-axis, Y-axis and Z axis is acquired respectively；
S2: it sums to the acceleration information of the X-axis, Y-axis and Z axis, obtains accumulated value；
S3: in the case where the accumulated value is greater than preset threshold, determine that the subject is kept in motion；
S4: in the case where the accumulated value is less than or equal to the preset threshold, determine that the subject is in static shape
State.
When specifically being measured, different data processing sides can be used for stationary state and motion state
Formula, such as:
1) it in the case where subject remains static, obtains after being located at the quantization of the piezoelectric transducer of center
Pressure data；To the pressure data after the quantization for the piezoelectric transducer for being located at center, smothing filtering is carried out；By smothing filtering
Afterwards as a result, pulse wave as the subject.
2) pressure data in the case where subject is kept in motion, after obtaining the quantization of each piezoelectric transducer；
Median filtering and smothing filtering are carried out to the pressure data after the quantization of each piezoelectric transducer, obtain filtered waveform number
According to；It identifies and removes the pseudo wave peak-to-peak signal in the filtered Wave data；By remove pseudo wave peak-to-peak signal after as a result, conduct
The pulse wave of the subject.It, can be with specifically, identify and remove the pseudo wave peak-to-peak signal in the filtered Wave data
It is to be fitted by Fourier space analytic method to the filtered Wave data, to remove pseudo wave peak-to-peak signal.
Above-mentioned apparatus and method are illustrated below with reference to a specific embodiment, it should be noted, however, that the tool
Body embodiment does not constitute an undue limitation on the present application merely to the application is better described.
In this example, pulse signal is acquired using highly sensitive piezoelectric transducer, while using acceleration transducer
The movement of subject is judged.
Specifically, in this example using one based on annular multipoint pressure measurement pulse wave equipment to pulse signal into
Row measurement can be positioned above (the specific measurement of 7 measurement points in the equipment based on annular multipoint pressure measurement pulse wave
The number of point can be, but not limited to be 7, as long as being more than or equal to three, particular number can be selected according to actual needs
It selects.Wherein, a highly sensitive piezoelectric transducer is arranged to acquire signal in each measurement point.As shown in Figure 1,101/103/
104/105/106/107/108 is the axis of piezoelectric transducer, altogether 7 axis.A high sensitivity is both provided on each axis
Piezoelectric transducer, wherein the effect of piezoelectric transducer is to measure the minor change of heart skin pressure when pumping blood every time.
As shown in Figure 1 102 and as shown in Figure 2 201, it is the casing part of annular, can integrate inside the housing
Have: filtering and amplifying circuit, ADC conversion circuit, power circuit, acceleration processing circuit and wireless radio frequency circuit etc..Further,
Shell, which can be bent, is wrapped in wrist, inside the housing partially includes acceleration sensor circuit, is passed by the acceleration
Sensor can identify the motion state of subject.
As shown in Fig. 2, for the side elevation section of the above-mentioned equipment for measuring pulse wave based on annular multipoint pressure, wherein
202/203/204 is the axis for the piezoelectric transducer that side view can be seen.It is more that the axis of piezoelectric transducer is slightly above based on annular
Point pressure measures the shell 201 of the equipment of pulse wave, for example, 0.5mm can be higher by.Wherein, the purpose being higher by is to make
The piezoelectric transducer obtained on each axis can touch skin well, and have faint pressure output, usually paste on the skin
Later, output pressure is between 0.01~0.05N it may be considered that it is that there is no problem that this device, which is worn,.
Specifically, the mode worn can be and is adhered on skin by way of double-sided adhesive, the shape of double-sided adhesive can
With bottom view as shown in Figure 1.It is attached to housing bottom when sticking double faced adhesive tape and keeps axis and piezoelectric transducer exposed.
The axis that axis in above equipment around center is arranged, arrangement can be circular, can also be not limited to circle
And other shapes are selected, the excentric wheelbase of the axis of the peripheral annular is from least 8mm or more.
It is illustrated in figure 3 the partial schematic diagram of the axis of single piezoelectric transducer, in Fig. 3,301 be axis body part, axis body
Inside is equipped with signal wire, and the pressure signal detected for acquiring piezoelectric transducer, 302 be piezoelectric transducer ontology, piezoelectricity
Sensor can be sheet, with very high sensitivity, the bounce of pulse can be detected by the piezoelectric transducer.
Specifically based on above-mentioned device, can measure in accordance with the following steps:
Step 1:, then will be at the piezoelectric transducer alignment wrist of center by double faced adhesive tape in the bottom surface of device
Beat pulse position, pasted, click the shell of device, connect the piezoelectric transducer of axis bottom completely with skin
Touching.
As shown in figure 4,601 be the shell of device, 602/605/606 is the axis of piezoelectric transducer, and 603 be skin histology,
604 be the blood vessel in skin histology.When cardiac pumping, blood can reach whole body everywhere with blood vessel, and blood passes through blood
The moment of pipe can cause the deformation of blood vessel, the direction of arrow as shown in Figure 4, since the axis of sensor is close to skin, each
The piezoelectric strain piece of the piezoelectric transducer of axis is all very sensitive, can measure the small variation that blood flows through blood vessel.
Step 2: device after receiving sign on, can with preset sample frequency (such as: 256Hz) acquire each pressure
The pressure data of electric transducer axis, and be stored in buffer and cache after pressure data is quantified；
Specifically, the acceleration of the data of tri- axis of X/Y/Z can be acquired respectively when the data of acquisition acceleration,
And collected data are denoted as F_X, F_Y, F_Z respectively, by collected data be stored to buffer area store it is spare.
Step 3: judging the numerical value of acceleration, judge whether subject is kept in motion.
Specifically, the data of each axis of acceleration can be taken to sum, if Sum=F_X+F_Y+F_Z；If Sun <
9.8, then it can determine that the subject is in quiescent condition, if Sun > 9.8, can determine that the subject is in movement shape
State.
Step 4: if the subject is in quiescent condition, the piezoelectric transducer of the center of interest position only being needed to read
The data of the value arrived, surrounding piezoelectric transducer are lost.The value of the piezoelectric transducer of center is smoothly filtered
It can be obtained by good data after wave；
Step 5: if the subject is kept in motion, the data of the foil gauge of each axis being subjected to 5 intermediate values
Filtering and smothing filtering, then carry out the removal of pseudo wave peak-to-peak signal again.As 702 in Fig. 5 show the wave of normal pulse signal
Peak is the spurious peaks of pulse signal shown in 701.Spurious peaks can interfere the calculating of heart rate, will be considered that this is also one in algorithm
Secondary heartbeat, therefore the heart rate measured is inaccurate.Spurious peaks are identified by algorithm in this example and are filtered out, can be obtained correctly
Pulse wave.
Wherein, above-mentioned pulse signal is a kind of signal of similar periodic group, but the periodicity of pulse is not one one-tenth
Constant, judge to need to be determined according to the length of adjacent peaks, two even adjacent wave crests also have small difference.This
Kind has periodically rule but is referred to as pseudoperiod without the signal of stringent accurately periodic quantity, can become spurious peaks.
The presence of spurious peaks can make the calculating of heart rate, and there are errors, therefore, in this example by removal pseudo wave peak-to-peak signal, can achieve filter
The purpose of wave.
Specifically, can first judge the value of acceleration signal, and judge whether subject is moving according to acceleration value
State.Judgment method is as mentioned above.When determining that subject is kept in motion, each piezoelectric transducer start recording number
According to, it is assumed that data length is 300 groups, then smothing filtering can be carried out to 300 groups of data first, obtains new one group 300
Data；Then, data fitting is carried out to each 300 groups of data by the tool box matlab, specifically, minimum two can be passed through
Multiplication is fitted.After the method fitting of least square method, data can filter some mixed and disorderly wave crests.As shown in fig. 6,
Wherein, be original signal data compared with dark colour line, the line compared with light colour be by smothing filtering and Least Square in Processing it
Data afterwards, that is, by smothing filtering and little bis- ?the combination filtering of method sharp wave caused by some movements can be filtered out
Fall.
After obtaining preliminary filtering signal, it is also necessary to after filtering there are still pseudo wave peak-to-peak signal be removed with
Guarantee the accuracy of final calculation result.Specifically, data can be fitted by Fourier space analytic method, thus
Remove pseudo wave peak-to-peak signal.
According to the definition of Fourier space, the function for the condition that meets can be converted into trigonometric function by Fourier transformation, then,
It assume that the periodic function that periodic signal is T is f (t), then its angular frequency W=2 π/T, then its trigonometric function
Fourier space can indicate:
Wherein, anAnd bnFor the coefficient of Fourier space.
Continuous signal is subjected to sliding-model control, it is assumed that sample frequency fs, time interval Ts, then the point sampled
Number are as follows:
Correspondingly, above-mentioned anAnd bnIt can indicate are as follows:
It when calculating parameter, needs to calculate the period of pulse wave, could be calculated by above-mentioned formula accurately
Data fitting result.The measurement in the period of pulse wave can use two adjacent maximum values to determine, unavailable two phases
Adjacent minimum value is as the current period, because the signal of peak valley is easy to that it is big to extract difficulty by noise jamming when movement.
Period measurement is described as follows below:
Assuming that 7 piezoelectric transducers take the data of same time same quantity of data respectively, and such as: all take 2 seconds data.It is logical
The data for spending two seconds after the fitting by smothing filtering and least square method, calculate current frequency value.For normally growing up
People, the heart rate value of quiescent condition is generally at 60-100 times or so, it may be assumed that 1-1.5Hz or so, adult's heart rate maximum of movement is not yet
It can be more than 200 times, i.e. 3.3Hz.The frequency of 7 piezoelectric transducers so calculated, if there is the pressure for being more than 4Hz passes
Sense, this group of data are not as the foundation of calculating cycle, because the noise of this sensor is bigger, data are deleted.Then, then
The interphase for finding out two maximum values adjacent in remaining 6 groups of data takes maximum interphase as current cycle T at that time.
Relational expression can be obtained according to Parseval's theorem:
It can be derived according to Parseval's theorem:
δ is defined as the power difference after Fourier transformation with converter, then having:
Wherein, xiIt is the collection value of piezo-electric sensor signals, different δ values can be set according to the difference of precision, passed through
Data after crossing Fourier space parsing can be as shown in Figure 7.In Fig. 7, compared with dark colour line for by smothing filtering and most
The initial data of small square law fitting, is that can be seen by the filtered waveform of Fourier space by Fig. 7 compared with the line of light colour
Out, after being filtered by Fourier space, some spurious peaks are all removed, and have also achieved the purpose that remove spurious peaks.
Solve the problems, such as that existing piezoelectric transducer does pulse wave and is unable to anti motion interference through the above way, the dress
The measurement of data can be carried out by the way of sticking double faced adhesive tape by setting, and be held to solve existing piezoelectric transducer with bandage
The case where being easily detached from skin.Further, by remove spurious peaks can solve piezoelectric transducer be attached to when, transporting
The unstable problem of resistance value under dynamic state.
All the embodiments in this specification are described in a progressive manner, same and similar portion between each embodiment
Dividing may refer to each other, and each embodiment focuses on the differences from other embodiments.Especially for system reality
For applying example, since it is substantially similar to the method embodiment, so being described relatively simple, related place is referring to embodiment of the method
Part explanation.In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ",
The description of " specific example " or " some examples " etc. means specific features described in conjunction with this embodiment or example, structure, material
Or feature is contained at least one embodiment or example of this specification embodiment.In the present specification, to above-mentioned term
Schematic representation be necessarily directed to identical embodiment or example.Moreover, description specific features, structure, material or
Person's feature may be combined in any suitable manner in any one or more of the embodiments or examples.In addition, in not conflicting feelings
Under condition, those skilled in the art by different embodiments or examples described in this specification and different embodiment or can show
The feature of example is combined.
The foregoing is merely the embodiments of this specification embodiment, are not limited to this specification embodiment.It is right
For those skilled in the art, this specification embodiment can have various modifications and variations.It is all in this specification embodiment
Any modification, equivalent replacement, improvement and so within spirit and principle, the right that should be included in this specification embodiment are wanted
Within the scope of asking.
Claims (10)
1. a kind of equipment based on annular multipoint pressure measurement pulse wave characterized by comprising
Shell；
Multiple axis, setting on the housing, are provided with a piezoelectric transducer, the piezoelectric transducer is for surveying on each axis
The variation of skin pressure when amount heart pumps blood every time；
Acceleration sensor circuit, setting is in the enclosure interior, the motion state of subject for identification.
2. equipment according to claim 1, which is characterized in that there is an axle position in center, institute in the multiple axis
The axis that the axis in multiple axis in addition to being located at center is surrounded positioned at center is stated to be arranged.
3. equipment according to claim 2, which is characterized in that except be located at center in addition to axis be located at center
The distance between axis be more than or equal to 8mm.
4. equipment according to claim 1, which is characterized in that be integrated with filtering and amplifying circuit, ADC conversion in the shell
Circuit, power circuit, acceleration processing circuit and wireless radio frequency circuit.
5. equipment according to claim 1, which is characterized in that the shell is what bendable material was fabricated to.
6. equipment according to claim 1, which is characterized in that each axis is higher than the default height of the shell in the multiple axis
Degree.
7. equipment according to claim 1, which is characterized in that the side that the shell is adjacent to subject's skin is provided with double
Face glue.
8. equipment according to claim 7, which is characterized in that double-sided adhesive shape same as the shell and big
It is small.
9. equipment according to claim 1, which is characterized in that be provided with 3-10 in the shell of the pulse measurement device
Axis.
10. equipment according to claim 1, which is characterized in that the piezoelectric transducer is the piezoelectric transducer of sheet.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811626745.3A CN109805918A (en) | 2018-12-28 | 2018-12-28 | A kind of equipment based on annular multipoint pressure measurement pulse wave |
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| CN201811626745.3A CN109805918A (en) | 2018-12-28 | 2018-12-28 | A kind of equipment based on annular multipoint pressure measurement pulse wave |
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