CN2138475Y - Electronic sphygmomanometer - Google Patents

Abstract

The utility model discloses an electronic sphygmomanometer which comprises a blood pressure measuring circuit, a heart rate measuring circuit, a blood pressure and heart rate data display circuit and a power circuit. The blood pressure measuring circuit is composed of a blood pressure sensor, a calculation and differential amplification circuit and an antijamming circuit. The heart rate measuring circuit is composed of a pulse sensor, a second stage operational amplifier, a reference frequency oscillator and an antijamming circuit. A measuring unit conversion circuit is composed of a switching circuit and a single chip apparatus, which can convert mmHg to KPa. The analog-digital conversion, dynamic describing and magnifying drive programmes of a complete machine are controlled by the CPU in the single clip apparatus. The utility model has the advantages of strong anti-interference ability, high measuring precision, small volume, light weight, convenient operation and portability, which can convert international measuring unit.

Description

Electronic sphygmomanometer

This utility model relates to a kind of instrument of measuring blood pressure and heart rate.

Traditional measurement blood pressure instrument has sphygomanometer, sphygomanometers, blood pressure device etc., this quasi-instrument mostly is frame for movement greatly, the low error of precision is big, particularly environmental noise disturbs greatly, and artificial factor of judgment is big, also has defectives such as the wandering evaporation of easy broken hydrargyrum harmful gas as the glass tubing of mercury column sphygomanometer, on this external measurement unit, it is SI units KPa that national Specification changes the mmHg post, so the utmost point waits to adopt new blood pressure inspection apparatus, to replace existing blood pressure instrument.CN86104845A discloses a kind of electric sphygmomanometer, it comprises the measurement blood pressure, the device of heart rate, storing apparatus, expression and blood pressure graphic recording device for information about etc., function is fairly perfect, but costs an arm and a leg, manipulation is not easy, be difficult to penetration and promotion at home, the and for example Japanese DS-91 type universal electric sphygomanometer that produces, 26S Proteasome Structure and Function is popular, but still have certain use limitation, adopt LCD to show as it, use inconvenient evening, the measurement unit of not adopting international standards, anti-tampering poor performance, make the measurement data instability inaccurate, in addition, on price, can not be accepted by the domestic user.

The purpose of this utility model is design a kind of replacements conventional sphygomanometer, a kind of popular style be highly resistant to environmental disturbances, electronic blood pressure instrument simple to operate, easy to carry, that price suits.

Design of the present utility model is; The electronic blood pressure instrument, it comprises blood pressure measuring circuit, heart rate measurement circuit, blood pressure heart rate digital display circuit and power circuit, it is characterized in that: blood pressure measuring circuit is made up of pressure transducer, operational amplifier, difference amplifier and anti-jamming circuit; The heart rate measurement circuit is made up of pulse pick off, two-level operating amplifier, agitator and anti-jamming circuit; Power circuit is shown by automatic shutdown circuitry, Switching Power Supply, voltage follower, voltage and central processing unit is formed; The measurement unit change-over circuit is made up of the some of Switching Power Supply and monolithic device; Be located at the anti-jamming circuit that is connected to Switching Power Supply outfan, blood pressure measuring circuit outfan, heart rate measurement circuit output end and measurement unit change-over circuit outfan in the monolithic device.

The advantage of such scheme is to make the blood pressure measurement precision can reach ± 0.2KPa, and error is not more than 1%, and systolic pressure, diastolic pressure, heart rate be clear display respectively, and daytime and evening are all intuitively clear, and measurement unit mmHg post and KPa can change mutually.Anti-environmental disturbances ability is strong, have secondary voltage to show and not influenced by artificial factor of judgment, and volume is little, and is in light weight, conveniently use and carry.

Below accompanying drawing is made brief description:

Fig. 1 is this utility model frame principle figure, among the figure, 1 is automatic shutdown circuitry, and 2 is Switching Power Supply, 3 is voltage follower, 4 is pressure transducer, and 5 is operational amplifier, and 6 is difference amplifier, 7 is the pulse pick off, 8 is two-level operating amplifier, and 9 is pulse oscillator, and 10 is the monolithic device, 11 is the measurement unit change-over circuit, 12 is anti-jamming circuit, and 13 is central processing unit (CPU), and 14 is the reference voltage agitator, 15 is the pulse sounder, 16 is pressure display LED, and 17 for pulse shows LED, and 18 is the supply voltage display circuit.

Fig. 2 implements circuit diagram, S among the figure for this utility model ₁Be SR ₅Capacitance sensor, S ₂Be X2050GP pressure transducer, U ₁Be L324 operational amplifier, U ₂Be MC34065, U ₃Be L324 operational amplifier, U ₄Be MC68705 type monolithic device, YZ is the fixed frequency crystal oscillator.

U ₄The monolithic device contains software program and comprises that measurement unit conversion (11), ELIMINATION OF ITS INTERFERENCE (12) and central processing unit (13), central processing unit software contain chess number conversion, voltage ratio than, reference frequency, operation amplifier, delay and running, dynamic scan, preposition amplification, power amplification, automatic voltage demonstration, automatic shutdown etc.

Automatic shutdown circuitry (1) is by triode Q₁、Q ₂, capacitor C₂, resistance R₄、R ₅、R ₆、R ₉Form. On-off circuit (2) is by SW₁Switch, integrated package U₂, triode Q₃、Q ₄, capacitor C₃、C ₄Diode D2, DZ₁、DZ ₂, resistance R₆～R ₁₅、R ₂₅、R ₂₆Form.

Blood pressure measurement amplifying circuit (4), (5), (6) are by pre ure tra ducer S₂, operation amplifier U₃a、U _3b、U _3c、U _3dCapacitor C₂₁、C ₂₃, resistance R₄₀～R ₅₂, potentiometer VR₂、VR ₃Form, heart rate measurement amplifying circuit (7), (8) are by pulse sensor S₁Operation amplifier U_1a、U _1bAnd capacitor C₁₄～C ₂₁-resistance R₃₀～R ₃₉Form, reference-frequency oscillator (14) is by triode Q₅、Q ₆And external resistance R₁₆～R ₁₉Capacitor C₇、C ₆Form with YZ, measurement unit change-over circuit (11) is by the software program the electric circuit constitute of Switching Power Supply (2) and single-chip microcomputer (10), and pulse sounder (15) is by XTAL sounder and capacitor C₁₀、C ₁₁Form. Blood pressure shows that (16) are by EP_4～6Form table mmHg post, EP_7～9Expression KPa pulse shows (17), EP_1～3The expression heart rate data, triode Q₁₀～Q ₁₈Be driving amplifier.

Anti-jamming circuit (12) is connected to Switching Power Supply (2) outfan, blood pressure measuring circuit (6) outfan, heart rate measurement circuit (7) outfan and measurement unit change-over circuit (11) outfan for being located in the single-chip microcomputer.

The existing 2 dynamic duty processes of describing embodiment in conjunction with the accompanying drawings.

Stir SW ₁Switch is put 2 positions, connects on the interior power supply.One route R ₈～R ₁₁, C ₃, C ₄, D ₂And U ₂Form low tension switch, Yi Bian send into U _1a, U _3d, another side is through R ₂₆, DZ ₂Send into U after the voltage stabilizing ₄18,19 feet form the accessory power supply end.Another road is through Q ₃Sampling, DZ ₁Voltage stabilizing, Q ₄Send into U after the adjustment ₄The main power source end of 3,4,7 feet.R ₂₅With C ₁₂Between branch's voltage send into Q ₁₀～Q ₁₈Drive signal power source and agitator working power as amplifying.This moment display circuit EP ₄, EP ₅Show remainder certificate.

S ₂Be pressure transducer, it converts pressure to the signal of telecommunication and sends into U _3a, U _3d, systolic pressure is U _3aOperational amplifier, diastolic pressure are U _3dOperational amplifier, VR ₂Be to adjust potentiometer, U _3bBe parallel difference amplifier, U _3oBe that voltage is followed device, resistance R ₅₂, R ₇₀And VR ₃Form the outer circuit of adjusting.

When measuring blood pressure, tied up airbag earlier, ball, EP are put in control ₄, EP ₅Last demonstration relevant pressure when high pressure rises to estimated value, stops inflation, venting gradually, EP _4,5,6, on numeral begin to descend, when dropping to initial systolic pressure, pressure transducer S ₂4 foot output voltages send into U _3aAnode, in-phase end voltage is higher than negative terminal (end of oppisite phase), U _3a1 foot output high level, through U _3bRelatively, low level is sent into U ₄24 feet, through U ₄The internal mode number conversion, dynamic scan is by 25～32 feet output EP ₄～EP ₅Show corresponding systolic pressure value.Blood pressure continues at EP ₄～EP ₅On descend gradually, pulse sounder XTAL has also sent sound simultaneously, when dropping to when relaxing swelling pressure S ₂2 foot output voltages of pick off are sent into U _3aIn-phase end, at this moment, U _3dThe output high level is sent into U ₄24 feet through U ₄The internal mode number conversion, dynamic scan is by the output of 25～32 feet, at EP ₄～EP ₆The last demonstration swelling pressure that relaxes, this moment, the pulse sound equipment stopped sounding.

When measuring pulse, S ₁The pulse pick off with sensitivity to signal voltage be added to U _1aThe in-phase input end of low gaining operating amplifier amplifies through one-level, again by U _1bHigh gain operational amplifier amplifies, through C ₁₃, R ₂₄Signal is sent into Q ₇, Q ₈The agitator of forming is sent oscillating voltage into U again ₄39 feet, through U ₄Interior analog digital conversion, dynamic scan is by the output of 25～32 feet, at EP ₁～EP ₃The pulse number of last demonstration per minute, in the oscillating voltage input, a part of signal and U ₄The benchmark frequency of oscillation of 35 feet inputs make comparisons, through U ₄Inner preposition amplification is after the power amplification, from U ₄5,6 feet output make XTAL send the dancing sound of pulse, again through U ₄Internal processes was delayed time after 2 seconds, XTAL send " too " 2, at EP ₁～EP ₂On promptly show the dancing number of times of per minute pulse.

In measuring process, the arm position put inaccurate or vibration is arranged, when mobile, at U ₄No. 3 anti-jamming circuits of interior design, when interference effect was arranged, EP can show on the digital XTAL of interference can send the interference sound equipment, reminds survey crew to note peace and quiet.After the ELIMINATION OF ITS INTERFERENCE, the last demonstration of EP correct digit, XTAL promptly recovers normal pulse sound.

The measurement unit transformation process, during energized, EP ₄, EP ₅Show zero, EP ₉Show that H represents mmHg post unit, when measuring systolic pressure, earlier by EP ₄～EP ₆The display of blood pressure data can be with the displacement of systolic pressure data at EP when measuring diastolic pressure ₇～EP ₉On, this moment EP ₉H disappear, mmHg post unit is converted to KPa international units of measurement, need SW ₁Be allocated to 3 position, this moment, voltage division signal added to U ₄40 feet, calculate digital-to-analogue conversion by its internal digital, after the turntable driving from U ₄25,26,29,30,31 feet output, at EP ₉The symbol of last demonstration P is in like manner earlier by EP ₄～EP ₆Show systolic pressure, when measuring easypro swelling pressure, EP ₉P disappear, be presented at EP ₇～EP ₉Go up for systolic pressure, at EP ₄～EP ₆Show the swelling pressure that relaxes.

After measuring, if not with SW ₁Turn off U ₄Inner chronotron is started working, after 90 seconds of delaying time, by U ₄1 shutdown of 36 feet output pulse, Q ₁By causing Q ₂End, shut down automatically.

Instrument in use, battery is little by little consuming, when voltage drops to setting value, EP _7～9The centre respectively demonstrates " " symbol, reminds user to have charged.As continue to use and go down EP _1～3The centre promptly demonstrates " " symbol, informs user, can not use, and must charge.

Claims (3)

1, electronic blood pressure instrument, it comprises blood pressure measuring circuit, heart rate measurement circuit, blood pressure heart rate data display circuit and power circuit, it is characterized in that:

A. the blood pressure slowdown monitoring circuit is made up of pressure transducer (4), operational amplifier (5), difference amplifier (6), anti-jamming circuit (12);

B. the heart rate measurement circuit is made up of pulse pick off (7), two-level operating amplifier (8), agitator (9), anti-jamming circuit (12);

C. power circuit shows that by automatic shutdown circuitry (1), on-off circuit (2), voltage follower (3) voltage (18) and central processing unit (13) are formed;

D. measurement unit change-over circuit (11) is made up of the some of on-off circuit (2) and monolithic device (10);

E. be located in the monolithic device (10), be connected to the anti-jamming circuit (12) of Switching Power Supply (2) outfan, blood pressure measuring circuit outfan, heart rate measurement circuit output end and measurement unit change-over circuit (11) outfan.

2, electronic blood pressure instrument as claimed in claim 1 is characterized in that:

A. blood pressure measurement amplifying circuit (4), (5), (6) are by pressure transducer S ₂, U is amplified in computing _3a, U _3b, U _3c, U _3d, capacitor C ₂₁, C ₂₂, resistance R ₄₀～R ₅₂, potentiometer VR ₂, VR ₃Form;

B. heart rate measurement amplifying circuit (7), (8) are by pulse pick off S ₁, U is amplified in computing _1a, U _1b, capacitor C ₁₄～C ₂₁, resistance R ₃₀～R ₃₉Form;

C. automatic shutdown circuitry (1) is by audion Q ₁, Q ₂Capacitor C ₂, resistance R ₄, R ₅, R ₆, R ₉Form;

D. on-off circuit (2) is by SW ₁Switch, integrated package U ₂, audion Q ₃, Q ₄, capacitor C ₃, C ₄Diode D ₂, DZ ₁, DZ ₂, resistance R ₈～R ₁₅, R ₂₅, R ₂₆Form;

3, electronic blood pressure instrument as claimed in claim 1 is characterized in that:

A. blood pressure data shows that (16) are by EP _4～6And EP _7～9Form;

B. pulse data show (17) is by EP _1～3Form;

C. the secondary voltage indicating circuit is by EP ₇～EP ₉, EP ₁～EP ₃Form with the some of monolithic device (10).

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