CN103417204A - Human body simulation and calibration device of oscilloscope electronic sphygmomanometer - Google Patents
Human body simulation and calibration device of oscilloscope electronic sphygmomanometer Download PDFInfo
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Abstract
The invention relates to a human body simulation and calibration device of an oscilloscope electronic sphygmomanometer. The device comprises a pressure vessel assembly, wherein the pressure vessel assembly is connected with the electronic sphygmomanometer, the output end of the pressure vessel assembly is connected with a control and processing assembly, the control and processing assembly is connected with a power amplifying assembly, and the power amplifying assembly is connected with the driving end of the pressure vessel assembly. The detected pressure value is transmitted into the control and processing assembly by the pressure vessel assembly, and the control and processing assembly controls the power amplifying assembly to generate a power amplifying driving signal according to the pressure value of the pressure vessel assembly, so as to simulate and generate the pulse wave in the pressure vessel assembly through the power amplifying driving signal. The control and processing assembly determines the systolic pressure Ps and diastolic pressure Pd of the electronic sphygmomanometer connected with the pressure vessel assembly according to a pressure signal with the pulse wave generated by the pressure vessel assembly. The device has the advantages that the structure is compact, the oscilloscope electronic sphygmomanometer can be calibrated, the calibration precision is high, the calibration operation is convenient, the applicable range is wide, and the safety and the reliability are realized.
Description
Technical field
The present invention relates to a kind of calibrating installation, especially a kind of oscillographic method electric sphygmomanometer human body simulation calibrating installation, belong to the technical field that sphygomanometer is calibrated.
Background technology
Blood pressure is the important parameter of reflection human recycle system function, the pressure that blood produces blood vessel wall while flowing in blood vessel, the physiological parameter of wanting as body weight for humans, blood pressure can reflect the function status of human heart and blood vessel, thereby becomes clinically the important evidence that diagnoses the illness, observes therapeutic effect, carries out prognosis judgement etc.
Blood pressure measuring method can be divided into wound measurement method and non-invasive measurement method.The most frequently used in the non-invasive measurement method is auscultation (Auscultatory method) and oscillographic method (Oscillometric method).
Auscultation is proposed in 1905 by the Ke Luotekefu of Russia, so far still at the blood pressure measuring method of clinical middle extensive use, also referred to as Ke Shi sound auscultation.But there is its intrinsic shortcoming in auscultation: the one, and exist and argue always mutually or on the 5th phase problem corresponding to the 4th at diastolic pressure, the differentiation error caused thus is very large.The 2nd, differentiate systolic pressure, diastolic pressure by listening Ke Shi sound, its reading is subject to the impact of user emotion, audition, environmental noise, measured's the series of factors such as anxiety, easily introduces subjective error.The electric sphygmomanometer made from the auscultation principle, although realized automatic detection, thoroughly do not solve its inherent defect yet, large, the poor repeatability of error, be subject to the judgement of noise jamming and diastolic pressure etc.
Oscillographic method is called again the pressure oscillation method, and its work process is first cuff to be inflated with the interruption artery blood flow, then in deflation course, detects the gas pressure in cuff and extracts faint pulse wave.As shown in Figure 1, as cuff pressure P far above systolic pressure P
sThe time, pulse wave is imperceptible (being difficult for measuring) almost, along with cuff pressure descends, as cuff pressure P from higher than systolic pressure P
sDrop to systolic pressure P
sWhen following, pulse wave can increase suddenly, at mean pressure P
mThe time amplitude U
mReach maximum, then pulse wave descends and decays with cuff pressure P again.The oscillographic method blood pressure measurement carrys out estimated blood pressure according to the relation between pulse wave amplitude and cuff pressure P.Faint pulse wave is extracted by electronic technology, its peak value is linked to be to line, draw envelope, as shown in Figure 2, the shape of envelope mainly is subject to systolic pressure P
s, diastolic pressure P
d, the parameter such as vascular mechanical characteristic impact, systolic pressure P wherein
sWith diastolic pressure P
dIt is the major effect amount.Oscillographic method is exactly according to the sample of levying that gathers envelope, and compares with the auscultation data, concludes and draws computing formula by statistics.
Therefore, the blood pressure measurement of oscillographic method principle is based on the method for statistics.The inherent defect of oscillographic method is there is no standardized algorithm, is based on statistical law more, rather than, based on personal feature, therefore can't obtain the measurement result identical with Ke Shi sound auscultation.Most electric sphygmomanometer, medical monitors adopted the oscillographic method Measure blood pressure at present.To at present, utilize oscillographic method to judge that the computational methods of systolic pressure and diastolic pressure can be summarized as two kinds: wave character method and amplitude characteristic ratios method.
The ultimate principle of wave character method is to utilize the flex point Measure blood pressure of pulse envelope, and during rising, static pressure corresponding to flex point is systolic pressure P
s, during decline, static pressure corresponding to flex point is diastolic pressure P
d.
The ultimate principle of amplitude characteristic ratios method is by maximum amplitude comparison and the normalized of the signal amplitude of pulse wave and signal, by normalization coefficient, identifies systolic pressure P
sWith diastolic pressure P
d.As shown in Figure 1, pulse wave maximum amplitude U
mThat corresponding is mean pressure P
m, systolic pressure P
sWith diastolic pressure P
dRatio by corresponding pulse wave maximum amplitude is that the wave amplitude coefficient is determined respectively.The wave amplitude coefficient k of systolic pressure
sThe wave amplitude coefficient k of (general value is 0.46～0.64) and diastolic pressure
d(general value is 0.44～0.73), for constant, is not quite similar for each producer, and the sphygomanometer of different model may be set different constants, and the selection of constant be take the clinical medicine test result as foundation.
Particularity in view of the oscillographic method sphygomanometer, therefore in 2010 formulate national technical specification JJG692-2010 noinvasive automatic measuring sphygmomanometer vertification regulation, there is no the requirement of blood pressure indicating value accuracy in technical specification, and the concept of " indicating value repeatability " proposed, the 5.3rd section " blood pressure indicating value repeatability (being applicable to the sphygomanometer of oscillographic method principle) is not more than 0.7kPa(5mmHg) ".The enforcement in 11 days November in 2010 of this vertification regulation.Therefore, how the oscillographic method electric sphygmomanometer being carried out to the requirement that standard meets indicating value repeatability is the urgent technical problems that solve of needs.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, provide a kind of oscillographic method electric sphygmomanometer human body simulation calibrating installation, its compact conformation, can be calibrated the oscillographic method electric sphygmomanometer, calibration accuracy is high, and calibration operation is convenient, wide accommodation, safe and reliable.
According to technical scheme provided by the invention, described oscillographic method electric sphygmomanometer human body simulation calibrating installation, comprise the pressure vessel assemblies for being connected with electric sphygmomanometer, the outfan of described pressure vessel assemblies is connected with the control processing components, controlling processing components is connected with power amplifier assembly, power amplifier assembly is connected with the drive end of pressure vessel assemblies, pressure vessel assemblies transfers to the force value of detection to control in processing components, control processing components and produce power amplification driving signal according to the force value power ratio control amplifier module of pressure vessel assemblies, produce pulse wave to drive signal to simulate by power amplification in pressure vessel assemblies, controlling processing components produces the pressure signal with pulse wave according to pressure vessel assemblies and determines the systolic pressure P with described pressure vessel assemblies connecting electronic sphygomanometer
swith diastolic pressure P
d.
Described pressure vessel assemblies comprises container, and an end of described container arranges rubber hose coupling, and the other end of container is equipped with pressure transducer and voice coil loudspeaker voice coil pressure pulse generator; Pressure vessel assemblies is connected with electric sphygmomanometer by rubber hose coupling, and the outfan of pressure transducer is connected with the control processing components; The outfan of power amplifier assembly is connected with the voice coil loudspeaker voice coil pressure pulse generator, by the voice coil loudspeaker voice coil pressure pulse generator, to produce pulse wave.
Described voice coil loudspeaker voice coil pressure pulse generator comprises magnet steel and is positioned at the iron core of described magnet steel, and the first end of described iron core is provided with diaphragm and coil, and described coil encircling is arranged on the outer ring of iron core, and diaphragm is positioned at the outside of iron core first end; Can the reciprocating motion of driven diaphragm outside iron core after coil electricity.
Train wheel bridge and lower plate are set on described magnet steel, and described train wheel bridge is positioned at the outer ring of iron core first end, and lower plate is positioned at the outer ring of iron core the second end, and the second end of iron core is corresponding with the first end of iron core; Train wheel bridge is provided with sealing ring, and diaphragm props up sheet by elasticity and is connected with sealing ring.
Described train wheel bridge is provided with for limiting the limited block of motion of membrane distance, and described limited block is positioned at the outside of coil; Coil is arranged on diaphragm by connection bracket.
Described container is cylindric, and volume of a container is 500mL.
Control processing components and comprise A/D conversion and the sampler for being connected with pressure vessel assemblies, the outfan of A/D conversion and sampler is connected with the CPU processor, the CPU processor is connected with display, data storage with keyboard, and the CPU processor is connected with the control end of power amplifier assembly.
Described power amplifier assembly comprises switching value controller, the control end of described switching value controller is connected with the outfan of controlling processing components, switching value controller also is connected with pulse signal generator and power amplifier, switching value controller makes pulse signal generator produce required pulse signal according to the control processing signals of controlling processing components, and described pulse signal is processed by power amplifier driving pressure container assemblies, producing pulse wave through switching value controller.
The outfan of described control processing components is connected with signal of telecommunication follower, and signal of telecommunication follower also is connected with the outfan of power amplifier assembly; Signal of telecommunication follower shows that the simulation pulse wave signal of processing components input is controlled in output and the power amplification of power amplifier assembly input drives signal.
The measuring range of described pressure transducer is 0～40KPa, and precision is 0.05 grade.
Advantage of the present invention: be connected with electric sphygmomanometer to be calibrated by pressure vessel assemblies, pressure vessel assemblies can transfer to force value the control processing components, control processing components and produce power amplification driving signal according to force value power ratio control amplifier module, by power amplification, drive signal to make the pulse wave that produces simulation in pressure vessel assemblies, determine the systolic pressure P of electric sphygmomanometer by pulse wave
sWith diastolic pressure P
d, by repeatedly measuring the systolic pressure P of judgement electric sphygmomanometer
sWith diastolic pressure P
dWhether be stabilized in the scope of a setting, to realize that the oscillographic method electric sphygmomanometer is carried out to the calibration of indicating value repeatability, compact conformation, calibration accuracy is high, and calibration operation is convenient, and wide accommodation is safe and reliable.
The accompanying drawing explanation
Fig. 1 is the schematic diagram of corresponding relation between existing pulse wave wave amplitude and cuff pressure.
Fig. 2 is pulse wave collection of illustrative plates in existing cuff.
Fig. 3 is the schematic diagram of simulation pulse wave and cuff pressure corresponding relation.
Fig. 4 is structured flowchart of the present invention.
The structural representation that Fig. 5 is pressure vessel assemblies of the present invention.
The structural representation that Fig. 6 is voice coil loudspeaker voice coil pressure pulse generator of the present invention.
Fig. 7 is existing energized conductor stressed schematic diagram in magnetic field.
Fig. 8 is the schematic diagram that concerns that the present invention simulates pulse wave wave amplitude and the outside move distance of diaphragm.
The schematic diagram that concerns that Fig. 9 is the outside move distance of diaphragm of the present invention and the resistance of motion.
Description of reference numerals: 1-pressure vessel assemblies, the 2-pressure transducer, 3-voice coil loudspeaker voice coil pressure pulse generator, 4-A/D conversion and sampler, the 5-CPU processor, 6-keyboard and display, the 7-data storage, the 8-pulse signal generator, the 9-switching value controller, the 10-power amplifier, 11-signal of telecommunication follower, the 12-power supply, the 13-container, the 14-rubber hose coupling, 15-ferrum core, 16-elasticity is propped up sheet, the 17-diaphragm, the 18-limited block, the 19-sealing ring, the 20-train wheel bridge, the 21-magnet steel, the 22-lower plate, 23-coil and 24-connection bracket.
The specific embodiment
Below in conjunction with concrete drawings and Examples, the invention will be further described.
As shown in Figure 4: in order to be calibrated the oscillographic method electric sphygmomanometer, meet the indicating value repeatability of electric sphygmomanometer, the present invention includes the pressure vessel assemblies 1 for being connected with electric sphygmomanometer, the outfan of described pressure vessel assemblies 1 is connected with the control processing components, controlling processing components is connected with power amplifier assembly, power amplifier assembly is connected with the drive end of pressure vessel assemblies 1, pressure vessel assemblies 1 transfers to the force value of detection to control in processing components, control processing components and produce power amplification driving signal according to the force value power ratio control amplifier module of pressure vessel assemblies 1, to drive signal to produce pulse wave in the interior simulation of pressure vessel assemblies 1 by power amplification, controlling processing components produces the pressure signal with pulse wave according to pressure vessel assemblies 1 and determines the systolic pressure P with described pressure vessel assemblies 1 connecting electronic sphygomanometer
swith diastolic pressure P
d.
Particularly, in the embodiment of the present invention, by determining the systolic pressure P of oscillographic method electric sphygmomanometer
sWith diastolic pressure P
d, by electric sphygmomanometer is carried out to operation repeatedly, the systolic pressure P of judgement electric sphygmomanometer
sWith diastolic pressure P
dWhether be stabilized in the scope of a setting, with realization, the oscillographic method electric sphygmomanometer calibrated.
Described control processing components comprises A/D conversion and the sampler 4 for being connected with pressure vessel assemblies 1, the outfan of A/D conversion and sampler 4 is connected with CPU processor 5, CPU processor 5 is connected with display 6, data storage 7 with keyboard, and CPU processor 5 is connected with the control end of power amplifier assembly.In the embodiment of the present invention, control processing components and can adopt computer, A/D conversion and sampler 4 are for realizing sampling and the analog digital conversion to pressure vessel assemblies 1 output pressure value, so that CPU processor 5 can carry out date processing, CPU processor 5 can adopt conventional micro-chip processor, keyboard and display 6 are for input and the demonstration output of data, and data storage 7 is E
2PROM or Flash Memory memorizer, for realizing the storage of data.
Described power amplifier assembly comprises switching value controller 9, the control end of described switching value controller 9 is connected with the outfan of controlling processing components, switching value controller 9 also is connected with pulse signal generator 8 and power amplifier 10, switching value controller 9 makes pulse signal generator 8 produce required pulse signal according to the control processing signals of controlling processing components, and described pulse signal is processed by the interior generation pulse wave of power amplifier 10 driving pressure container assemblies 1 through switching value controller 9.Switching value controller 9 essence are digitized level magnitude controller.Switching value controller 9 is according to the control signal of CPU processor 5 inputs, control drive pulse signal generator 8 and produce required pulse signal, described pulse signal is amplified rear drive pressure vessel assemblies 1 by power amplifier 10 and is produced the pulse wave of simulation after switching value controller 9 is processed.
Further, the outfan of described control processing components is connected with signal of telecommunication follower 11, and signal of telecommunication follower 11 also is connected with the outfan of power amplifier assembly; Signal of telecommunication follower 11 shows that the simulation pulse wave signal of processing components input is controlled in output and the power amplification of power amplifier assembly input drives signal.Signal of telecommunication follower 11 can adopt oscillograph, by signal of telecommunication follower 11, can drive signal and simulation pulse wave signal are shown and the wave amplitude amplitude of simulation pulse wave signal is adjusted to power amplification, to reach desirable simulation pulse wave signal.In the embodiment of the present invention, also comprise power supply 12, described power supply 12 is electrically connected to power amplifier assembly and control processing components, for the working power of power amplifier assembly and control processing components is provided.
As shown in Fig. 5, Fig. 6 and Fig. 7: as described in pressure vessel assemblies 1 comprise container 13, an end of described container 13 arranges rubber hose coupling 14, the other end of container 13 is equipped with pressure transducer 2 and voice coil loudspeaker voice coil pressure pulse generator 3; Pressure vessel assemblies 1 is connected with electric sphygmomanometer by rubber hose coupling 14, and the outfan of pressure transducer 2 is connected with the control processing components; The outfan of power amplifier assembly is connected with voice coil loudspeaker voice coil pressure pulse generator 3, by voice coil loudspeaker voice coil pressure pulse generator 3, to produce pulse wave.
Described container 13 is cylindric, and the volume of container 13 is 500mL.The measuring range of described pressure transducer 2 is 0～40KPa, and precision is 0.05 grade.Container 13 adopts hard materials to make, and rubber hose coupling 14 is connected with the cavity in container 13, the force value of pressure transducer 2 in can inspection instrument 13, and described force value is transferred in the control processing components.
Described voice coil loudspeaker voice coil pressure pulse generator 3 comprises magnet steel 21 and is positioned at the iron core 15 of described magnet steel 21, the first end of described iron core 15 is provided with diaphragm 17 and coil 23, described coil 23 is around the outer ring that is arranged on iron core 15, and diaphragm 17 is positioned at the outside of iron core 15 first ends; After coil 23 energisings, energy driven diaphragm 17 is in the reciprocating motion in iron core 15 outsides.Iron core 15 has first end and second end corresponding with described first end.
As shown in Figure 3: in order to carry out analog calibration to the oscillographic method electric sphygmomanometer, in the embodiment of the present invention, the simulation pulse wave is comprised of a section (smooth section: amplitude is consistent), b section (ascent stage: amplitude increases progressively gradually), c section (descending branch: amplitude is successively decreased gradually), d section (smooth section: amplitude is consistent), with reference to national technical specification, systolic pressure P
sWith diastolic pressure P
dSetting value is respectively 20.0kPa(150mmHg) and 13.2kPa(99mmHg), pulse frequency is set as 80 times/min, the corresponding systolic pressure P set
s, diastolic pressure P
dWith maximum amplitude P
mThe static pressure force produce respectively flex point, with the alignment requirements of the indicating value repeatability that adapts to wave character method electric sphygmomanometer; Get k
s=k
d=0.435, to guarantee systolic pressure P
sCorresponding amplitude (k
s* U
m) and amplitude (k corresponding to diastolic pressure
d* U
m) can drop on respectively in b section and c section, to meet the requirement of the various algorithms of amplitude characteristic ratios method electric sphygmomanometer.
The container 13 of pressure vessel assemblies 1 is connected with the electric sphygmomanometer sebific duct by rubber hose coupling 14, and pressure transducer 2, through A/D conversion and sampler 4, passes to CPU processor 5 by the force value (being cuff pressure) in container 13 in real time.Force value (being cuff pressure) in container 13 is along with the unlatching of the inner vent valve of electric sphygmomanometer, the decline gradually of pressure.Pressure value P=the P detected when pressure transducer 2
1[P
1=22kPa(165mmHg)] time, CPU processor 5 sends instruction, pulse signal pulse signal generator 8 produced by switching value controller 9, after amplitude level is controlled, in the cycle by pulse frequency, be transferred to one by one power amplifier 10, through power amplification rear drive voice coil loudspeaker voice coil pressure pulse generator 3, produce the pulse wave of simulation human body at hard hydrostatic column 13, a section, simulate the consistent stage of pulse wave wave amplitude as shown in Figure 3.
Along with the continuation of pressure descends, the pressure value P=P detected when pressure transducer 2
s[P
s=20kPa(150mmHg)] time, CPU processor 5 sends instruction, and the amplitude of simulation pulse wave enters incremental stages gradually, b section as shown in Figure 3, and at P
s(systolic pressure) locates to produce flex point; In like manner, the pressure value P=P detected when pressure transducer 2
m[P
m=16.8kPa(126mmHg)] time, CPU processor 5 sends instruction, and the amplitude of simulation pulse wave enters depletion stage gradually, c section as shown in Figure 3, and at P
m(maximum amplitude U
m) locate to produce flex point; (2) pressure value P=the P detected when pressure transducer
d[P
d=13.2kPa(99mmHg)] time, CPU processor 5 sends instruction, and the amplitude of simulation pulse wave enters the consistent stage of wave amplitude again, d section as shown in Figure 3, and at P
d(diastolic pressure) locates to produce flex point; Pressure value P=the P detected when pressure transducer 2
2[P
2=11.2kPa(84mmHg)] time, CPU processor 5 sends instruction, and pulse signal pulse signal generator 8 sent by switching value controller 9 is closed, and the simulation pulse wave finishes.
Voice coil loudspeaker voice coil pressure pulse generator 3 forms evenly constant magnetic circuit working gas gap of magnetic field by magnetic core 15, train wheel bridge 20, lower plate 22, magnet steel 21, coil 23 props up sheet 16 by diaphragm 17 and elasticity and is fixed in the magnetic circuit working gas gap, coil 23 have electric current (pulse signal) by the time can gain freedom move up and down.In the situation that airtight hard hydrostatic column 13 internal pressures are constant, when coil 23 does not have electric current, diaphragm 17 is close to limited block 18 under the effect of pressure, 13 constancies of volume of hard hydrostatic column, constant pressure; When coil 23 passes through electric current, diaphragm 17 is subject at coil 23 under the effect of electromagnetic force, outwards moves to peak (peak is relevant with the amplitude level of pulse signal), and the volume of hard hydrostatic column 13 diminishes.According to ripple Yi Erdinglv, under the steady temperature condition, pressure P and the volume V of gas be inversely proportional to (PV=constant).Because of each pulse cycle very short (T=0.75s), variations in temperature can be ignored, the motion of diaphragm 17 has changed the volume of container 13 interior gases, produced little pressure oscillation, this pressure oscillation and pulse frequency cycle synchronisation, and at CPU processor 5 under the condition of the amplitude of switching value controller 9 control waves, simulate the pulse wave of human body.
Voice coil loudspeaker voice coil pressure pulse generator 3 is electric energy (pulse signal) to be converted to the transducer mount of mechanical energy (volume-variation), has trigger sensitivity high, the controllable characteristics of mechanical energy size.Its operation principle will be subject to the Ampere law of electromagnetic force based on current－carrying conductor in magnetic field.To electric current (I) in conductor, conductor, the effective length (L) in magnetic field and the magnetic induction (B) in conductor magnetic field of living in are directly proportional the suffered electromagnetic force of current－carrying conductor (F), that is: F=B * L * I.The direction of electromagnetic force as shown in Figure 7.
In order to simulate the simulation pulse wave shown in Fig. 3, the pressure wave wave amplitude that voice coil loudspeaker voice coil pressure pulse generator 3 produces is the key of " calibrating installation ", and in the embodiment of the present invention, the principal element that affects the pressure wave wave amplitude has:
1), the pressure drop of hard hydrostatic column 13, according to ripple Yi Erdinglv, need to change volume largelyr and just can reach the consistent purpose of pressure wave wave amplitude, as shown in Figure 8.
2), due to the pressure drop of hard hydrostatic column 13, the pressure that the diaphragm of voice coil loudspeaker voice coil pressure pulse generator 3 bears also reduces thereupon, as shown in Figure 9.
3), the elasticity of voice coil loudspeaker voice coil pressure pulse generator 3 props up sheet, along with the increase of outside move distance, the resilience force of suffered rehabilitation center position also presents exponent increase, as shown in Figure 9.
The listed parameter of table 1 is the data of " calibrating installation ".The diameter of voice coil loudspeaker voice coil pressure pulse generator 3 upper diaphragms 17 is 25mm, and the effective length of conductor is 5m, and impedance is 4 Ω.To control in processing components, by look-up table, to the wave amplitude of the pressure wave under different pressures, carry out the control of drive current, reach the simulation pulse wave shown in Fig. 3.
Table 1 is the relation of simulation pulse wave and drive current
When the oscillographic method electric sphygmomanometer is calibrated, can adopt following step:
1), repeatability detects
At first the power supply 12 of opening, trace routine is selected and entered to keyboard and display 6, in order to can realize required date processing and control by CPU processor 5.
Sebific duct between detected electric sphygmomanometer and cuff is pulled up, after the rubber hose coupling 14 of container 13 1 ends is connected, is started detected electric sphygmomanometer and carry out blood pressure test for the first time, and the test result systolic pressure P of recording blood pressure meter
sWith diastolic pressure P
d, and then repeat 4 blood pressure tests logging test results.After detecting end, powered-down 12.
According to JJG692-2010 noinvasive automatic measuring sphygmomanometer vertification regulation, the blood pressure indicating value repeatability of tested electric sphygmomanometer is calculated as follows:
In formula: S
S(D)For systolic pressure (or diastolic pressure) indicating value repeatability, kPa(mmHg); R
S(D)Be maximum in 5 systolic pressures (or diastolic pressure) measurement result and poor (extreme difference) of minima, kPa(mmHg); C is the extreme difference coefficient, measures frequency n=5 o'clock, C=2.33.
2), demarcate
The purpose of demarcating is whether the waveform parameter of detected pressures sensor accuracy (2) and simulation pulse wave maintains design point.
2.1), the demarcation of pressure transducer 2
At first the power supply 12 of opening, keyboard and display 6 are selected and are determined the calibrating function that enters pressure transducer 2.Accuracy is not less than to the sebific duct of standard pressure generator of 0.02 grade with after the rubber hose coupling 14 of container 13 ends is connected, starts to demarcate.Fixed point is P
1=13.2kPa(99mmHg), P
2=16.8kPa(126mmHg), P
3=20kPa(150mmHg) three points, corresponding correction factor k respectively
1, k
2, k
3, by the keyboard to set up correction factor, make the pressure relative error of indicating value Δ P of " calibrating installation "≤0.05%.
2.2), the modification of analog waveform parameter
After the demarcation to pressure transducer 2 finishes, the waveforms amplitude of simulation pulse wave is calibrated.The holding wire of digital oscilloscope is connected with signal of telecommunication follower 11 ports of " calibrating installation ", can be seen the simulation pulse wave that comprises a, b, c, d section of " calibrating installation " periodic transfer by oscillograph, revise the parameters such as pressure wave amplitude in table 1, the resistance of motion by keyboard, change the amplitude of each pulse of analog wave.
3), measuring result uncertainty
According to the requirement of JJF1059.1-2012 " evaluation of uncertainty in measurement and expression ", calculate the measurement result uncertainty of " calibrating installation ".By analyzing, the flex point of the pressure spot that measurement result is had the greatest impact when the simulation pulse wave rises, i.e. systolic pressure P
sUncertainty.
3.1), mathematical model
Δ P=P – P
Mark(1)
In formula: Δ P is pressure measurement errors, the kPa of unit; The measured value that P is pressure transducer 2, the kPa of unit; P
MarkFor the normal pressure value, the kPa of unit.
Obtain variance by formula (1):
In formula: u
1The uncertainty component of introducing for the accuracy of pressure transducer; u
2Uncertainty component for analog wave flex point hysteresis introducing.Propagation coefficient: c
1=c
2=1
3.2), the uncertainty component
3.2.1 pressure transducer 2 is (0～40) kPa, 0.05 grade, at 20kPa(150mmHg) time maximum error of measuring:
Δ=± 40 * 0.05%=± 0.02kPa, get
(being uniformly distributed):
3.2.2 it is owing to when pressure, equaling flex point pressure that the flex point of analog wave lags behind, before flex point, an issued pulse not yet finishes, and its amplitude does not increase progressively, and makes the flex point hysteresis.The maximum of lag time is a pulse period, because pulse frequency is set as 80 times/min, therefore have:
According to the electric sphygmomanometer outgassing rate, in (0.3～0.4) kPa/s scope, picking and placeing gas speed is 0.4kPa/s,
(being uniformly distributed) has:
3.3, combined standard uncertainty:
By formula (2), obtained:
Standard uncertainty: u=0.088kPa
By calculating, measure the standard uncertainty u=0.087kPa of the blood pressure indicating value result of electric sphygmomanometer with " calibrating installation ".Bring this value into JJG692-2010 noinvasive automatic measuring sphygmomanometer vertification regulation blood pressure indicating value repeatability computing formula:
From result of calculation, S
S(or u)≤0.7kPa/5, meet in JJG692-2010 noinvasive automatic measuring sphygmomanometer vertification regulation fully, and electric sphygmomanometer blood pressure indicating value repeatability is not more than to 0.7kPa(5mmHg) test condition.
The present invention is connected with electric sphygmomanometer to be calibrated by pressure vessel assemblies 1, pressure vessel assemblies 1 can transfer to force value the control processing components, control processing components and produce power amplification driving signal according to force value power ratio control amplifier module, by power amplification, drive signal to make the pulse wave of the interior generation of pressure vessel assemblies 1 simulation, determine the systolic pressure P of electric sphygmomanometer by pulse wave
sWith diastolic pressure P
d, by repeatedly measuring the systolic pressure P of judgement electric sphygmomanometer
sWith diastolic pressure P
dWhether be stabilized in the scope of a setting, to realize that the oscillographic method electric sphygmomanometer is carried out to the calibration of indicating value repeatability, compact conformation, calibration accuracy is high, and calibration operation is convenient, and wide accommodation is safe and reliable.
Claims (10)
1. an oscillographic method electric sphygmomanometer human body simulation calibrating installation, it is characterized in that: comprise the pressure vessel assemblies (1) for being connected with electric sphygmomanometer, the outfan of described pressure vessel assemblies (1) is connected with the control processing components, controlling processing components is connected with power amplifier assembly, power amplifier assembly is connected with the drive end of pressure vessel assemblies (1), pressure vessel assemblies (1) transfers to the force value of detection to control in processing components, control processing components and produce power amplification driving signal according to the force value power ratio control amplifier module of pressure vessel assemblies (1), produce pulse wave to drive signal to simulate by power amplification in pressure vessel assemblies (1), controlling processing components produces the pressure signal with pulse wave according to pressure vessel assemblies (1) and determines the systolic pressure P with described pressure vessel assemblies (1) connecting electronic sphygomanometer
swith diastolic pressure P
d.
2. oscillographic method electric sphygmomanometer human body simulation calibrating installation according to claim 1, it is characterized in that: described pressure vessel assemblies (1) comprises container (13), one end of described container (13) arranges rubber hose coupling (14), and the other end of container (13) is equipped with pressure transducer (2) and voice coil loudspeaker voice coil pressure pulse generator (3); Pressure vessel assemblies (1) is connected with electric sphygmomanometer by rubber hose coupling (14), and the outfan of pressure transducer (2) is connected with the control processing components; The outfan of power amplifier assembly is connected with voice coil loudspeaker voice coil pressure pulse generator (3), by voice coil loudspeaker voice coil pressure pulse generator (3), to produce pulse wave.
3. oscillographic method electric sphygmomanometer human body simulation calibrating installation according to claim 2, it is characterized in that: described voice coil loudspeaker voice coil pressure pulse generator (3) comprises magnet steel (21) and is positioned at the iron core (15) of described magnet steel (21), the first end of described iron core (15) is provided with diaphragm (17) and coil (23), described coil (23) is around the outer ring that is arranged on iron core (15), and diaphragm (17) is positioned at the outside of iron core (15) first end; Can the reciprocating motion of driven diaphragm (17) outside iron core (15) after coil (23) energising.
4. oscillographic method electric sphygmomanometer human body simulation calibrating installation according to claim 3, it is characterized in that: train wheel bridge (20) and lower plate (22) are set on described magnet steel (21), described train wheel bridge (20) is positioned at the outer ring of iron core (15) first end, lower plate (22) is positioned at the outer ring of iron core (15) second ends, and the second end of iron core (15) is corresponding with the first end of iron core (15); Train wheel bridge (20) is provided with sealing ring (19), and diaphragm (17) props up sheet (16) by elasticity and is connected with sealing ring (19).
5. oscillographic method electric sphygmomanometer human body simulation calibrating installation according to claim 4, it is characterized in that: described train wheel bridge (20) is provided with for limiting the limited block (18) of diaphragm (17) move distance, and described limited block (18) is positioned at the outside of coil (23); Coil (23) is arranged on diaphragm (17) by connection bracket (24).
6. oscillographic method electric sphygmomanometer human body simulation calibrating installation according to claim 2, it is characterized in that: described container (13) is cylindric, and the volume of container (13) is 500mL.
7. oscillographic method electric sphygmomanometer human body simulation calibrating installation according to claim 1, it is characterized in that: control processing components and comprise A/D conversion and the sampler (4) for being connected with pressure vessel assemblies (1), the outfan of A/D conversion and sampler (4) is connected with CPU processor (5), CPU processor (5) is connected with display (6), data storage (7) with keyboard, and CPU processor (5) is connected with the control end of power amplifier assembly.
8. oscillographic method electric sphygmomanometer human body simulation calibrating installation according to claim 1, it is characterized in that: described power amplifier assembly comprises switching value controller (9), the control end of described switching value controller (9) is connected with the outfan of controlling processing components, switching value controller (9) also is connected with pulse signal generator (8) and power amplifier (10), switching value controller (9) makes pulse signal generator (8) produce required pulse signal according to the control processing signals of controlling processing components, described pulse signal is processed by producing pulse wave in power amplifier (10) driving pressure container assemblies (1) through switching value controller (9).
9. oscillographic method electric sphygmomanometer human body simulation calibrating installation according to claim 1, it is characterized in that: the outfan of described control processing components is connected with signal of telecommunication follower (11), and signal of telecommunication follower (11) also is connected with the outfan of power amplifier assembly; Signal of telecommunication follower (11) shows that the simulation pulse wave signal of processing components input is controlled in output and the power amplification of power amplifier assembly input drives signal.
10. oscillographic method electric sphygmomanometer human body simulation calibrating installation according to claim 2, it is characterized in that: the measuring range of described pressure transducer (2) is 0 ~ 40KPa, precision is 0.05 grade.
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