CN201958880U - Portable electronic blood-pressure meter - Google Patents
Portable electronic blood-pressure meter Download PDFInfo
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- CN201958880U CN201958880U CN201120055946XU CN201120055946U CN201958880U CN 201958880 U CN201958880 U CN 201958880U CN 201120055946X U CN201120055946X U CN 201120055946XU CN 201120055946 U CN201120055946 U CN 201120055946U CN 201958880 U CN201958880 U CN 201958880U
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- filter circuit
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Abstract
The utility model discloses a portable electronic blood-pressure meter, which mainly solves that problem that the conventional portable electronic blood-pressure meter cannot measure blood pressure accurately. The portable electronic blood-pressure meter is characterized in that a micro control unit (MCU) data acquiring and processing unit, a liquid crystal display screen and a pressure detecting unit as well as a 30Hz second-order Butterworth low-pass filter circuit and a 0.5Hz band-pass filter circuit are included; the pressure detecting unit is positioned inside the sandwich of a sleeve; the low-pass filter circuit is used for filtering out high-frequency interference from the output signal of the pressure detecting unit; the band-pass filter circuit is used for filtering out static pressure to acquire a human pulse wave signal; and the MCU data acquiring and processing unit is used for receiving analog signals output by the low-pass filter circuit and the band-pass filter circuit respectively and outputting a human pulse displaying signal to the liquid crystal display screen after the analog signals are computed and processed by a built-in program. By adopting the portable electronic blood-pressure meter, the average pressure of arteries can be measured directly and the measurement is not interfered by environmental noise and is accurate.
Description
Technical field
This utility model relates to a kind of blood pressure measuring device, specifically, relates to a kind of portable blood pressure measuring device.
Background technology
Existing portable blood pressure measuring device all is based on the measuring principle of oscillographic method basically, promptly adopt pneumatic sleeve to block the upper arm artery blood flow, because the effect of Hemodynamics on Pathogenesis of heartbeat, will the overlapping and synchronous pressure oscillation of heartbeat on gas sleeve pressure, it is pulse wave, carry out the oscillographic method blood pressure measurement in the prior art, come estimated blood pressure according to the relation between pulse wave amplitude and the gas sleeve pressure, therefore the immediate problem that causes is measured inaccurate exactly.
Summary of the invention
In order to solve the problems of the prior art that background technology proposes, this utility model provides a kind of Portable Electronic Blood Pressure Monitor, this kind Portable Electronic Blood Pressure Monitor can directly be measured the tremulous pulse mean pressure, can get rid of the influence of operator's subjective factors, also be not subjected to the interference of environmental noise, have the measurement characteristic of accurate.
The technical solution of the utility model is: this kind Portable Electronic Blood Pressure Monitor, comprise power supply, have fill, the exit oversleeve of control valve and supporting air pump, wherein, described Portable Electronic Blood Pressure Monitor also comprises MCU data acquisition and processing (DAP) unit, LCDs and a pressure sensing cell that adopts MPX5050GP CASE 867B-04 type semiconductor gas pressure sensor, and described pressure sensing cell is positioned at the interlayer of described oversleeve; In addition, also comprise second order Butterworth low-pass filter circuit and 0.5 hertz of bandwidth-limited circuit of one 30 hertz, described low-pass filter circuit is used for filtering and comes from High-frequency Interference in the described pressure sensing cell output signal, and described bandwidth-limited circuit is used for the filtering static pressure to obtain human pulse ripple signal; Described MCU data acquisition and processing (DAP) unit adopts the ATmega128 chip, receives the analogue signal that comes from low-pass filter circuit and bandwidth-limited circuit output respectively, after the computing of plug-in, to described LCDs output human pulse shows signal.
In addition, the control valve that fills, exits that can set described oversleeve is an electromagnetic valve, exports control signal by the unitary digital signal output end of described MCU data acquisition and processing (DAP) to it, to control the gas that charges and discharge of described oversleeve.
The utlity model has following beneficial effect: owing to take such scheme, the blood pressure ripple signal that is extracted by pressure transducer is easy to handle into single-chip microcomputer, and built-in calculation procedure can calculate in the following manner: the cuff pressure of getting pulse Sasser amplitude maximum correspondence is mean pressure, in the oversleeve deflation course, detect oversleeve and pulse wave signal simultaneously, when detecting amplitude, the interior pressure of oversleeve this moment is the mean pressure of human body, so this kind checkout gear can be measured mean pressure comparatively accurately.
Description of drawings
Fig. 1 is a composition sketch map of the present utility model.
Fig. 2 is the electrical schematic diagram of pressure sensing cell in this utility model.
Fig. 3 is the theory diagram to being handled by the signal of pressure sensing cell output in this utility model.
Fig. 4 is the electrical schematic diagram of second order Butterworth LPF in this utility model.
Fig. 5 is the electrical schematic diagram of second-order bandpass filter in this utility model.
Fig. 6 is the electrical schematic diagram of LCDs circuit in this utility model.
The specific embodiment
The utility model is described in further detail below in conjunction with accompanying drawing:
By shown in Figure 1, this kind Portable Electronic Blood Pressure Monitor comprises having fill, the exit oversleeve of control valve and supporting air pump.In addition, described Portable Electronic Blood Pressure Monitor also comprises MCU data acquisition and processing (DAP) unit, LCDs and a pressure sensing cell that adopts MPX5050GP CASE 867B-04 type semiconductor gas pressure sensor, described pressure sensing cell is positioned at the interlayer of described oversleeve, in addition, also comprise one 30 hertz second order Butterworth low-pass filter circuit and 0.5 hertz of bandwidth-limited circuit, described low-pass filter circuit is used for filtering and comes from High-frequency Interference in the described pressure sensing cell output signal, and described bandwidth-limited circuit is used for the filtering static pressure to obtain human pulse ripple signal; Described MCU data acquisition and processing (DAP) unit adopts the ATmega128 chip, receives the analogue signal that comes from low-pass filter circuit and bandwidth-limited circuit output respectively, after the computing of plug-in, to described LCDs output human pulse shows signal.
Below to above-mentioned component units determine make detailed description one by one:
The design's MCU data acquisition and processing (DAP) unit is selected ATmega128 for use, based on 8 Low-Power CMOS microprocessors of AVR risc architecture.Because its advanced instruction set and one-cycle instruction time of implementation, the data throughput of ATmega128 is up to 1 MIPS/MHz.
The MPX5050-GP atmospheric pressure pick off that pressure sensing cell selects for use motorola inc to produce.Gas pressure sensor adopts MPX5050GP CASE 867B-04 type semiconductor gas pressure sensor.Temperature-compensation circuit is contained in its inside, temperature-compensating is interval to surpass-40 ℃～125 ℃, and includes two-stage amplifying circuit and output conversion circuit, exports high-caliber analogue signal and need not to handle again and can link to each other with A/D converter, the linearity is good, and is easy to use.It can change into the pressure of 0～50Ka the voltage of 0～4.7V, satisfies the design needs of electric sphygmomanometer fully.From the signal of pick off PIN1 output is the static pressure of oversleeve the oversleeve deflation course, the mixed signal that pulse involves various interfering signals.Wherein the static pressure signal amplitude is bigger, and pulse wave signal is faint, as shown in Figure 2, is the pressure detection circuit schematic diagram.
The analogue signal of coming out from gas pressure sensor is the mixed signal that static pressure, pulse involve various interfering signals.Oscillographic method needs the waveform quality static pressure and the independent two paths of signals of pulse wave of oversleeve deflation course preferably, in order to obtain useful signal, must use signal processing circuit that coherent signal is extracted.The static pressure signal can be regarded direct current signal as in the oversleeve deflation course, and the pulse wave of human body is that 1～3Hz and frequency are formed less than the each harmonic of 30Hz by dominant frequency, and 99% concentration of energy is in the frequency range of frequency less than 10Hz.This will designing filter separates this two paths of signals, obtain primary pulse wave and static pressure signal, and the amplitude of pulse wave signal is very little, after the conditioning that need amplify pulse wave signal, so that the collection of signal.
This programme adopts the low pass filter of 30Hz and the band filter of 0.5Hz, so that with the interfering signal filtering, two kinds of useful signals is separated.The filter element of signal is selected for use the second order Butterworth LPF, as shown in Figure 4, electrical schematic diagram for the second order Butterworth LPF, sensor to signal through obtaining the static pressure signal of cuff and faint pulse signal behind the low pass filter, because the static pressure signal is very large more than pulse signal, can think that this pressure signal is the static pressure signal this moment, carries out subsequent treatment through giving processor behind the voltage follower.So this circuit is as long as the low-pass filter circuit of a 30Hz of design just can extract static pressure signal and pulse wave signal.Consider the amplitude of signal, the passband amplification K of designing filter
FBe 1.Fig. 5 is the electrical schematic diagram of second-order bandpass filter in this utility model.
The MS12864R Chinese character image dot matrix lcd module that the display part has selected for use Shenzhen dimension outstanding person to wait company limited to produce is considered the pin of ATmega128 and the distribution of function, and the MS12864 display circuit designs as shown in Figure 6.
Adopt in the basic scheme and manually charge and discharge gas, and the force value in the real-time sampling oversleeve, when the oversleeve inflation reaches the threshold value that sets, adopt LCD to show, inform that the operator inflates at this moment to finish; Control valve is exitted with proper speed then, and tries not to change the aperture of valve in deflation course.Consider the moment of valve opening, pulse wave has the impulse disturbances of an about 2s, so adopt the method for time-delay to keep away this interference, carry out the AD sampling then, otherwise the value after the sampling processing can become very inaccurate.And on the venting finishing control, adopt programme-control, and when the number of the peak value of sampling pulse wave arrives the value of regulation, judge that venting finishes this moment, can carry out the processing and the display result of data.
On above scheme basis, can carry out following improvement: change the control valve that fills, exits of described oversleeve into electromagnetic valve, export control signal to it, to control the gas that charges and discharge of described oversleeve by the unitary digital signal output end of described MCU data acquisition and processing (DAP).So just can further realize automatic voltage measurement.
After using this programme, after native system and PC and the communication, two paths of signals in the single measurement deflation course can be plotted among the figure in real time, really reflect the oscillography ratio juris, and the data that collect can be handled, the form with a man machine interface intuitively shows at last.
Claims (2)
1. Portable Electronic Blood Pressure Monitor, comprise power supply, have fill, the exit oversleeve of control valve and supporting air pump, it is characterized in that: described Portable Electronic Blood Pressure Monitor also comprises MCU data acquisition and processing (DAP) unit, LCDs and a pressure sensing cell that adopts MPX5050GP CASE 867B-04 type semiconductor gas pressure sensor, and described pressure sensing cell is positioned at the interlayer of described oversleeve; In addition, also comprise second order Butterworth low-pass filter circuit and 0.5 hertz of bandwidth-limited circuit of one 30 hertz, described low-pass filter circuit is used for filtering and comes from High-frequency Interference in the described pressure sensing cell output signal, and described bandwidth-limited circuit is used for the filtering static pressure to obtain human pulse ripple signal; Described MCU data acquisition and processing (DAP) unit adopts the ATmega128 chip, receives the analogue signal that comes from low-pass filter circuit and bandwidth-limited circuit output respectively, after the computing of plug-in, to described LCDs output human pulse shows signal.
2. a kind of Portable Electronic Blood Pressure Monitor according to claim 1, it is characterized in that: the control valve that fills, exits of described oversleeve is an electromagnetic valve, export control signal by the unitary digital signal output end of described MCU data acquisition and processing (DAP) to it, to control the gas that charges and discharge of described oversleeve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120055946XU CN201958880U (en) | 2011-03-06 | 2011-03-06 | Portable electronic blood-pressure meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120055946XU CN201958880U (en) | 2011-03-06 | 2011-03-06 | Portable electronic blood-pressure meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201958880U true CN201958880U (en) | 2011-09-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201120055946XU Expired - Fee Related CN201958880U (en) | 2011-03-06 | 2011-03-06 | Portable electronic blood-pressure meter |
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| Country | Link |
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| CN (1) | CN201958880U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106409042A (en) * | 2016-05-18 | 2017-02-15 | 河北工业大学 | Portable self and mutual rescue training equipment |
| CN112315439A (en) * | 2020-12-06 | 2021-02-05 | 张茺 | Electronic sphygmomanometer with pulse waveform |
-
2011
- 2011-03-06 CN CN201120055946XU patent/CN201958880U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106409042A (en) * | 2016-05-18 | 2017-02-15 | 河北工业大学 | Portable self and mutual rescue training equipment |
| CN112315439A (en) * | 2020-12-06 | 2021-02-05 | 张茺 | Electronic sphygmomanometer with pulse waveform |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110907 Termination date: 20120306 |