CN100349544C - Improved electronic blood pressure-detecting method and device - Google Patents
Improved electronic blood pressure-detecting method and device Download PDFInfo
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- CN100349544C CN100349544C CNB2004100511732A CN200410051173A CN100349544C CN 100349544 C CN100349544 C CN 100349544C CN B2004100511732 A CNB2004100511732 A CN B2004100511732A CN 200410051173 A CN200410051173 A CN 200410051173A CN 100349544 C CN100349544 C CN 100349544C
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- 230000036772 blood pressure Effects 0.000 claims abstract description 27
- 238000004891 communication Methods 0.000 claims abstract description 10
- 238000005259 measurement Methods 0.000 abstract description 6
- 238000009530 blood pressure measurement Methods 0.000 description 18
- 238000013022 venting Methods 0.000 description 8
- 230000017531 blood circulation Effects 0.000 description 6
- 239000002775 capsule Substances 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 230000035487 diastolic blood pressure Effects 0.000 description 3
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- 230000035488 systolic blood pressure Effects 0.000 description 3
- 230000003321 amplification Effects 0.000 description 2
- 210000001367 artery Anatomy 0.000 description 2
- 238000002555 auscultation Methods 0.000 description 2
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Abstract
The present invention relates to an improved electronic blood pressure detecting method on the basis of a system composed of a cuff (10), an inflation pump (50), a pressure sensor (30), a deflation electromagnetic valve (70), a microprocessor (100), a communication interface (120), and a display screen (110) or an upper machine (200). The method comprises the steps that a three-way magnetic valve (20) is added between the cuff (10) and the pressure sensor (30); when power is supplied at the first time, the electromagnetic valve (20) is firstly communicated with atmosphere, the pressure sensor (30) is used for zero calibration, and then, the electromagnetic valve (20) is communicated with the cuff (10); the communication interface (120) displays the inner pressure of the cuff (10) by the upper machine (200) or the display screen (110) during measurement; when an overtime phenomenon or an overpressure phenomenon occurs, the system can immediately discharge the cuff pressure to ensure the safety; the zero calibration is periodically carried out in the gaps of the period measurement. The present invention ensures the accurate zero pressure point and has a reliable and safe guarantee.
Description
Technical field the present invention relates to be used for the measurement blood pressure of diagnostic purpose, the device of pulse frequency, relates in particular to a kind of device of accurately suppressed zero pressure measxurement blood pressure.
Non-invasive blood pressure measuring method all is the oscillation method that adopts based on the cuff pulse wave in the background technology prior art.The non-invasive measurement method of human blood-pressure mainly contains auscultation (being called for short Ke Shi sound method) that utilizes the Ke Shi sound and the proportionality coefficient method (abbreviation succusion) of utilizing the cuff wave of oscillation.
Ke Shi sound method is that experienced medical personnel adopt stethoscope, mercury pressure is taken into account cuff, the charge/discharge gas capsule is by being bundled in cuff the appropriate location of experimenter's upper arm, press close to brachial artery with stethoscope, inflate increase pressure up to the blood flow of blocking arm with the charge/discharge gas capsule to cuff, progressively lower cuff pressure to recover the blood flow of arm by the charge/discharge gas capsule then, one of the artery blood flow of arm pulsation meeting generation is ascending in this process, the descending again Ke Shi change of tuneization, and can listen to the variation of Ke Shi sound to determine systolic pressure and diastolic pressure by stethoscope and mercury gauge.
Present most blood pressure measuring methods that have been to use based on succusion in electronic blood pressure measurement equipment, basic process and auscultation are very similar, promptly also boost to block the blood flow of arm by the cuff inflation, make the cuff deflation blood pressure lowering to recover the blood flow of arm then gradually, and the static pressure in the monitoring cuff and because of the pressure pulse wave that pulsation produced of arterial blood, but computational methods are by measuring pressure pulse wave and the corresponding cuff pressure thereof that artery blood flow pulsatile change at the deflation course arm is delivered in the cuff to be produced, can detect one group of amplitude from small to large, descending again pressure pulse involves corresponding descending cuff pressure, and be mean pressure with the corresponding cuff pressure of maximum of pressure pulse wave, come to press high direction to extrapolate systolic pressure according to the amplitude proportional coefficient of the pressure pulse wave of empirical value (maximum of pressure pulse wave multiply by two two pairing cuff pressure of range value that obtain less than 1 coefficient and is respectively systolic pressure and diastolic pressure) again, and extrapolate diastolic pressure (being called for short proportionality coefficient method) based on cuff vibration pulse magnitude to the direction that cuff forces down to cuff.
The basic structure of electronic blood pressure measurement equipment generally comprises pressure transducer and the treatment circuit that () detects cuff pressure; (2) the pressure pulse wave treatment circuit that changes based on cuff pressure; (3) excess pressure detecting sensor and amplification, protection treatment circuit; (4) gas circuit and the control of filling, exit that are connected with pressure transducer of cuff, control vent valve, inflator pump; (5) mould/number conversion, Single Chip Microcomputer (SCM) system, (six) power pack.Wherein the detection of pressure pulse wave and cuff pressure can be placed on venting stage or aeration phase after the inflation in the measuring process, the venting form in venting stage can be evenly to exit continuously (promptly to successively decrease with the 3-5mmHg uniform pressure, while detected pressures pulse wave), also can be that (promptly the step with 5-10mmHg lowers cuff pressure one by one in the step venting, detected pressures pulse wave on each pressure step), the big young pathbreaker of each step hypotension determines according to detected pulse wave amplitude.Continuously even venting form will increase the time of blood pressure measurement process, the influence that arm motion, position are changed also is difficult to overcome, its application is subjected to certain limitation, and step venting form will reduce the blood pressure measurement time, and can overcome because the interference of initiations such as arm motion, position variation, possesses better anti-jamming capability, so a lot of company adopts step venting form mostly in blood pressure measurement.
The shortcoming of prior art:
What the oscillation method that non-invasive blood pressure is measured realized relying on hardware and software comprehensively finishes blood pressure measurement; wherein hardware components considers that mainly one is the amplification to cuff pressure and pressure pulse wave signal; the 2nd, cuff is pressed independently overvoltage crowbar of another road; the 3rd, the digital circuit part, the present hardware components major defect of understanding has:
The detection of A, band pressure needs periodic school Z-operation, at present be automatic zero adjustment under the direct condition that does not have to inflate at cuff mostly, but because circuit drift exists and be difficult in blood pressure measurement process repeatedly guarantee that static pressure in the cuff can be reduced to the force value near " zero ", this will cause one to be to fail in possible school zero; The 2nd, school zero success but still may produce the force value deviation that causes because of zero migration can influence the accuracy that cuff pressure is measured in a word.
B, according to safe requirement, need to have two in the blood pressure measurement process and overlap the restriction that timing system is independently guaranteed Measuring Time, present blood pressure measurement module normally module self has a cover timing system, and provide an interface to trigger port to link to each other with the outside timing that provides, realize another set of independent timing system by the timing function of host computer, also can finish the safety requirements of independent timing, but this blood pressure module is not realized complete safe independence timing system, need the cooperation of host computer, will bring hidden danger to the Secure Application of blood pressure module like this.
Summary of the invention technical problem to be solved by this invention is to propose a kind of improved electronic blood pressure checkout gear for fear of the deficiencies in the prior art part.This device is added three-way magnetic valve between cuff and pressure transducer, normal open QI KOU of this valve is connected with cuff by prolonging trachea, its normally closed QI KOU communicates with air, so just realized when carrying out blood pressure measurement, pressure transducer and whole gas circuit UNICOM, respond to the pressure in the gas circuit in real time, also make regularly and can carry out in the blood pressure measurement process and the interval of blood pressure measurement at every turn, by the switching that powers up to this three-way valve, make that above-mentioned pressure transducer can be directly and ambient atmosphere UNICOM, can obtain " zero pressure " calibration value exactly, realize the calibration automatically regularly of " zero pressure " of the no inner air path participation that cuff pressure is measured, finish the accurate measurement of cuff pressure.
Simultaneously, newly-increased one tunnel independence timing circuit, by a slice single-chip microcomputer or two fix 180 seconds ± 5 seconds time limit timer circuit composes in series, the input of this trigger is connected with an I/O mouth of the master microprocessor of blood pressure module (MCU), wherein when coming the starting impulse of autonomous MCU for one, start this timer work of prescribing a time limit, when receiving a termination pulse once more, will stop above-mentioned timer work in limited time, at its input a delay gate circuit is arranged in addition, prevent from when powering on, to produce trigger impulse and start fixed cycle operator unusually.
The present invention solve the technical problem by adopting following technical scheme to realize:
Manufacture and design a kind of improved electronic blood pressure checkout gear, comprise cuff, inflator pump, pressure transducer, pressure-releasing electromagnetic valve, master microprocessor, display screen, communication interface and host computer, especially also comprise three-way magnetic valve, the public blow vent of described three-way magnetic valve connects pressure transducer, the normal open QI KOU connects cuff, and normally closed QI KOU is communicated with atmosphere.
Described improved electronic blood pressure checkout gear also comprises independent timing circuit, overvoltage time-out circuit and valve-driving circuit, described pressure-releasing electromagnetic valve connects valve-driving circuit, the input termination master microprocessor of described valve-driving circuit and the overtime control circuit of overvoltage, the output of an input termination independence timing circuit of the overtime control circuit of described overvoltage.
The startup timing input termination master microprocessor of described independent timing circuit.
Described independent timing circuit is that the master constitutes by second microprocessor, and realizes regularly, triggers function by software mode; An I/O interface of described second microprocessor connects an I/O interface of master microprocessor, and another I/O interface of second microprocessor connects an input of the overtime control circuit of overvoltage.
Described communication interface can be the RS232 interface, can also adopt USB interface.
The present invention compares with the circuit design of prior art, and first advantage is: optimized the gas circuit syndeton, realize cuff pressure automatically, the automatic calibration of the no gas circuit residual pressure influence in " zero-pressure force " accurately, increase the accuracy that cuff pressure is measured.
Second advantage is: adopted a cover timing circuit to realize independent time limit timing function in the blood pressure measurement process, really realized the regularly independent of module level, strengthened the blood pressure measurement process safe and guaranteed.
Description of drawings Fig. 1 is the principle of compositionality block diagram of device of the present invention;
Fig. 2, Fig. 3, Fig. 4 are the flow charts that device of the present invention detects blood pressure;
Fig. 5 is the electrical schematic diagram of independent timing circuit in the device of the present invention.
The specific embodiment is further described in detail the present invention below in conjunction with accompanying drawing and most preferred embodiment.
The improved electronic blood pressure checkout gear of the present invention, as shown in Figure 1: comprise cuff 10, inflator pump 50, pressure transducer 30, pressure-releasing electromagnetic valve 70, microprocessor 100, display screen 110, communication interface 120 and host computer 200, especially: also comprise three-way magnetic valve 20, the public blow vent of described three-way magnetic valve 20 connects pressure transducer 30, the normal open QI KOU connects cuff 10, and normally closed QI KOU is communicated with atmosphere.
Described improved electronic blood pressure checkout gear also comprises independent timing circuit 45, overvoltage time-out circuit 46 and valve-driving circuit 71, described pressure-releasing electromagnetic valve 70 connects valve-driving circuit 71, the input termination master microprocessor 100 of described valve-driving circuit 71 and the overtime control circuit 46 of overvoltage, the output of an input termination independence timing circuit 45 of the overtime control circuit 46 of described overvoltage.
Method with described improved electronic blood pressure checkout gear detection blood pressure as Fig. 2, Fig. 3, shown in Figure 4, comprises step:
A. at first, between cuff 10 and pressure transducer 30, add three-way magnetic valve 20;
B. after, when system's energising is started working, make three-way magnetic valve 20 work in pressure transducer 30 earlier and connect atmospheric state, pressure transducer 30 carries out zero point correction and detects;
C. after zero point correction finishes, make three-way magnetic valve 20 work in the state that pressure transducer 30 is connected cuff 10, when carrying out blood pressure measurement, starting inflator pump 50 starts working to cuff 10 pressurizations, host computer 200 receives data and shows cuff 10 internal pressures by communication interface 120, or by display screen 110 demonstration cufves 10 internal pressures, after cuff 10 internal pressures reached setting value, pressurization stopped;
D. system's opening/closing pressure-releasing electromagnetic valve 70 according to the speed venting of setting, and detects whether the pulse signal appearance is arranged;
E. having detected pulse signal occurs; Master microprocessor 100 carries out date processing according to the determined algorithm of solidification software, and is showing the pressure value that records on the display screen 110 or on the host computer 200;
F. in measuring process, run into overtime or the overvoltage phenomenon, system closes inflator pump 50 immediately, opens pressure-releasing electromagnetic valve 70, and cuff 10 internal pressures are released, and guarantees safe in utilizationly, and makes master microprocessor 100 reset again;
G. one-shot measurement finishes, and opens pressure-releasing electromagnetic valve 70, with pressure releasing, closes pressure-releasing electromagnetic valve 70;
When h. carrying out blood pressure measurement once more, suppressed zero pressure begins circulation from step b if desired; Do not need suppressed zero pressure, then begin circulation from step c.
Said method step a is described to be added three-way magnetic valve 20 and comprises step between cuff 10 and pressure transducer 30:
A. the public blow vent with three-way magnetic valve 20 connects pressure transducer 30, and the normal open QI KOU connects cuff 10, and normally closed QI KOU is communicated with atmosphere;
B., three-way valve drive circuit 21 is set, and this circuit 21 is by master microprocessor 100 controls;
C. the pin of 100 pairs of three-way valve drive circuits of master microprocessor 21 control is by output high level and low level, make three-way magnetic valve 20 work in public blow vent is communicated with the normal open QI KOU, with the A condition of normally closed gas disconnection and with public blow vent and the disconnection of normal open QI KOU, the B state that is communicated with normally closed gas.
As shown in Figure 1: realize described method based on system also comprise independent timing circuit 45 and the overtime control circuit 46 of overvoltage, when step f, in described measuring process, run into overtime or the overvoltage phenomenon, system closes inflator pump 50 immediately, open pressure-releasing electromagnetic valve 70, be provided with an independent timing circuit 45 in the described system, described independent timing circuit 45 is started by master microprocessor 100 controls, timing time is once arriving the overtime control circuit 46 of overvoltage to exporting a control signal, the overtime control circuit 46 of this overvoltage cuts out inflator pump 50 immediately, opens pressure-releasing electromagnetic valve 70, with pressure releasing.
Described independent timing circuit 45 is that the master constitutes by the second microprocessor U2, and realizes regularly, triggers function by software mode; The I/O interface of the second microprocessor U2 connects an I/O interface of master microprocessor 100, and another I/O interface of the second microprocessor U2 connects an input of the overtime control circuit 46 of overvoltage.
Described communication interface 120 adopts the RS232 interface in most preferred embodiment, can also select USB interface for use in other embodiments.
Most preferred embodiment as shown in Figure 5: the P02 interface of the startup timing input termination master microprocessor 100 of described independent timing circuit 45.The second microprocessor U2 among the figure is made of the MSP430 type single-chip microcomputer of TI, finishes timing by the systems soft ware of MSP430, when U2 detects the startup timer signal, promptly starts software timer; When U2 detects termination timing device signal, promptly stop software timer; The restriction of this software timer will depend on the application model setting: promptly adult/neonate pattern is provided with, and adult mode is 180 ± 1 seconds, and the neonate pattern is 90 ± 1 seconds.
Certain above-mentioned timer can also adopt analog device to realize same function.
In this most preferred embodiment, the I/O mouth P1.0 of microprocessor U2 connects the input of overtime control circuit 46, when system is in other armed state except that the measurement state, this port keeps low level, and this port will be exported a high level when system is in normal surveying work state, and keep until this measuring process finishes, this port is got back to low level once more and is continued to keep armed state.When an input end of overtime control circuit 46 during in low level, timer is in and stops time status, have only that this port just has output when the timing of timer surpasses in limited time (as 180 ± 1 seconds (adult) or 90 ± 1 seconds (neonate)), start pressure-releasing electromagnetic valve 70, stop inflator pump 50, and notice master microprocessor 100.
Facts have proved that the present invention has optimized the gas circuit syndeton, realize cuff pressure automatically, " zero-pressure force " calibration automatically of no residual pressure influence accurately, increased the accuracy that cuff pressure is measured.
Simultaneously, the present invention has adopted a cover timing circuit to realize independent time limit timing function in the blood pressure measurement process, has really realized the regularly independent of module level, has strengthened the blood pressure measurement process safe and has guaranteed.
Claims (6)
1. improved electronic blood pressure checkout gear, comprise cuff (10), inflator pump (50), pressure transducer (30), pressure-releasing electromagnetic valve (70), master microprocessor (100), display screen (110), communication interface (120) and host computer (200), it is characterized in that: also comprise three-way magnetic valve (20), the public blow vent of described three-way magnetic valve (20) connects pressure transducer (30), the normal open QI KOU connects cuff (10), and normally closed QI KOU is communicated with atmosphere.
2. according to the described improved electronic blood pressure checkout gear of claim 1, it is characterized in that: described improved electronic blood pressure checkout gear also comprises independent timing circuit (45), the overtime control circuit of overvoltage (46) and valve-driving circuit (71), described pressure-releasing electromagnetic valve (70) connects valve-driving circuit (71), the input termination master microprocessor (100) of described valve-driving circuit (71) and the overtime control circuit of overvoltage (46), the output of an input termination independence timing circuit (45) of the overtime control circuit of described overvoltage (46).
3. according to the described improved electronic blood pressure checkout gear of claim 2, it is characterized in that: the startup timing input termination master microprocessor (100) of described independent timing circuit (45).
4. according to the described improved electronic blood pressure checkout gear of claim 3, it is characterized in that: described independent timing circuit (45) is that the master constitutes by the second microprocessor U2, and by software mode realization timing, triggering function, the I/O interface of the described second microprocessor U2 connects an I/O interface of master microprocessor (100), and another I/O interface of the second microprocessor U2 connects an input of the overtime control circuit of overvoltage (46).
5. according to the described improved electronic blood pressure checkout gear of claim 1, it is characterized in that: described communication interface (120) is the RS232 interface.
6. according to the described improved electronic blood pressure checkout gear of claim 1, it is characterized in that: described communication interface (120) is a USB interface.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2004100511732A CN100349544C (en) | 2004-08-16 | 2004-08-16 | Improved electronic blood pressure-detecting method and device |
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| CNB2004100511732A CN100349544C (en) | 2004-08-16 | 2004-08-16 | Improved electronic blood pressure-detecting method and device |
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| CN1608583A CN1608583A (en) | 2005-04-27 |
| CN100349544C true CN100349544C (en) | 2007-11-21 |
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Cited By (1)
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| CN1608583A (en) | 2005-04-27 |
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