CN201675933U - Blood pressure gauge calibration device based on oscillography - Google Patents
Blood pressure gauge calibration device based on oscillography Download PDFInfo
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- CN201675933U CN201675933U CN2010201701152U CN201020170115U CN201675933U CN 201675933 U CN201675933 U CN 201675933U CN 2010201701152 U CN2010201701152 U CN 2010201701152U CN 201020170115 U CN201020170115 U CN 201020170115U CN 201675933 U CN201675933 U CN 201675933U
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- position sensor
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Abstract
The utility model relates to a blood pressure gauge calibration device based on oscillography, which solves the problems of short service life and low accuracy of an existing calibration device. An air bag (13) arranged inside an inner cavity of a cylinder (12) is communicated with a cuff gas path (15) through a steam hole (14); the cylinder is connected with a supporting column (4); the supporting column (4) is connected with a linear stepping motor (1); a shading bar (6) arranged on a motor screw shaft (3) matches with a position sensor (5); the motor screw shaft (3) is connected with a threaded hole of a piston (8) positioned on the air bag (13); a circuit board (7) is fixed onto the outer wall of the cylinder; the position sensor (5) is arranged on the circuit board (7); a gap is arranged between the lateral wall of the piston (8) and the inner cavity wall of the cylinder (12); the position sensor (5) is connected with a single chip microcomputer; the single chip microcomputer is connected with a programmable logic gate array; a pressure sensor S1 arranged on the cuff gas path (15) is connected with the single chip microcomputer and the programmable logic gate array through an analog-digital converter U1; and the programmable logic gate array is connected with the linear stepping motor (1) through a motor driver and connected with an electromagnetic valve on the cuff gas path (15) through a driving circuit.
Description
Technical field:
This utility model is relevant with the calibrating installation of the blood pressure instrument with alternating wave generator.
Background technology:
The blood pressure instrument calibrating installation is the important device of accuracy that guarantees the output parameter of blood pressure instrument.Alternating wave generator is the core component of oscillographic method blood pressure instrument calibrating installation.
External at present existing blood pressure instrument calibrating installation based on oscillographic method, but their alternating wave generator often adopts linear electric motors to add the mode of piston, because the frictional force of piston and cylinder wall is very big, had a strong impact on the accuracy of blood pressure calibrating installation, influence the service life of whole device simultaneously.
The utility model content:
The purpose of this utility model provides a kind of simple in structure, long service life, the blood pressure instrument calibrating installation based on oscillographic method that calibration accuracy is high.
This utility model is achieved in that
This utility model is based on the blood pressure instrument calibrating installation of oscillographic method, cylinder 12 inner chambers have air bag 13 to be communicated with cuff gas circuit 15 through steam vent 14, cylinder is connected with pillar 4, pillar 4 is connected with linear stepping motor 1, there is shading strip 6 to cooperate on the motor screw axle 3 with position sensor 5, motor screw axle 3 is connected with the screwed hole of piston 8, piston 8 is positioned on the air bag 13, circuit board 7 is fixed in casing outer wall, position sensor 5 on it, gapped between the internal chamber wall of the sidewall of piston 8 and cylinder 12, position sensor 5 is connected with single-chip microcomputer, single-chip microcomputer is connected with programmable gate array, there is pressure transducer S1 to be connected with programmable gate array with single-chip microcomputer on the cuff gas circuit 15 through mould one number converter U1, programmable gate array is connected with linear stepping motor 1 through motor driver, is connected with electromagnetic valve on the cuff gas circuit 15 through drive circuit.
Pressure transducer S1 is connected with analog-digital converter U1 through integrated amplifier, integrated amplifier is formed first order difference channel by amplifier A1, A2, and the output of first order difference channel is imported analog-digital converter U1 again through the second level difference channel that amplifier A3 forms after the secondary low pass filter filtering that amplifier A4 forms.
Operation principle of the present utility model is as follows:
The cuff of non-invasive blood pressure measuring instrument links to each other with piston by gas circuit, after starting the blood pressure measurement function, the blood pressure instrument calibrating installation is controlled the linear stepping motor driven plunger according to the calibration curve that is provided with, airtight cuff gas is come and gone compression, thereby in cuff, produce a pressure oscillation ripple.The vibration wave amplitude is by the amplitude decision of piston motion, and its frequency is by the frequency decision of piston back-and-forth movement.
During calibration, at first the cuff gas circuit with the electric sphygmomanometer that is calibrated is connected with calibrating installation, one group of pressure value (systolic pressure/mean pressure/diastolic pressure) is set on the blood pressure calibrating installation, and calibrating installation will call corresponding calibration curve (being the wave of oscillation of different envelopes and the relation curve of corresponding cuff pressure) according to the pressure value of setting.Electric sphygmomanometer is inflated earlier afterwards to exit to cuff and is also carried out blood pressure measurement simultaneously, in the process of cuff inflation and venting, the pressure transducer of blood pressure calibrating installation detects the air pressure in the cuff in real time, according to calibration curve, with the pressure reduction in the cuff is the distance of linear stepping motor motion, control the motor-driven piston then and take exercises, the motor back and forth movement compresses the volume of airtight air like this, thereby produces the pressure oscillation ripple in cuff.Along with the oscillation amplitude of the electric sphygmomanometer inflation and the venting wave of oscillation is ascending, descending again variation is 0 until pulsation, finally produces the envelope of the wave of oscillation and the calibration relation of cuff pressure.After the electric sphygmomanometer that is calibrated detected systolic pressure and diastolic pressure, quick air releasing was to atmospheric pressure.The pressure transducer of blood pressure instrument calibrating installation perceives this pressure variation rear motor and quits work.Wherein, electromagnetic valve is used for overvoltage protection, and when the pressure in the airtight cuff during greater than certain air pressure, in order to protect pick off, electromagnetic valve is with the gas rapid release in the gas circuit.
Blood pressure instrument calibrating installation based on oscillographic method has designed novel alternating wave generator, adopt air bag to fill the cavity of cylinder, come compressing gasbag with linear stepping motor, barrier between piston and inner chamber of cylinder block wall have, avoided the friction of piston and cylinder body like this, prolong the life-span of blood pressure calibrating installation, adopted novel circuit structure to guarantee the accuracy of non-invasive blood pressure measuring instrument simultaneously.
Description of drawings:
Fig. 1 is a circuit block diagram of the present utility model.
Fig. 2 is a mechanical construction drawing of the present utility model.
Fig. 3 is circuit theory diagrams of the present utility model.
The specific embodiment:
This utility model is made up of the core control circuit that alternating wave generator, pressure transducer, position sensor, electromagnetic valve, cuff gas circuit, single-chip microprocessor MCU and programmable gate array FPGA form.
Alternating wave generator is made up of piston, linear stepping motor and position sensor.The piston of tradition alternating wave generator and cylinder wall friction are serious, and long-time use has not only influenced the air-tightness of piston, and has reduced the life-span of motor and the precision of stepping.For this reason, we have designed the piston of the fricton-tight friction of a cover, as shown in Figure 2.
At first the rubber pneumatic bag 13 of end cover with cuff gas circuit 15 spreads out of from the lateral hole 14 of cylinder 12, and air bag 13 is placed on the cylinder body the inside, and cuff gas circuit 15 is placed on the outside, clamps cuff at the place, hole of lateral cylinder surface simultaneously;
The relative position of 9, four screws in four screw places that four hexagonal insulated columns 4 is installed on the cylinder upper surface respectively is the same with the installation screw relative position of motor;
With screw 2 is installed motor 1 is fixed on four insulated columns 4 together with piston 8 then;
At last, will be installed in the side of cylinder together with the circuit board 7 that contains position sensor 5:
The relative position of motor 1 and cylinder 12 is constant like this, when air bag 13 inflation, be connected on the screw rod 3 piston 8 just compressing gasbag produce the wave of oscillation.In the process of compression balloon, because the size of piston 8 is just less than the cavity of cylinder 12, so there is not friction with the cylinder body wall.
The piston position testing circuit
Owing in the process that system powers on, guarantee that piston is in fixed position, at every turn to guarantee the concordance of calibration process, so designed the piston position testing circuit.This circuit is realized by a grooved optocoupler photoelectric sensor that is installed in the fixed position.
The position of piston testing circuit is made up of U2 comparator LM311 and U3 grooved optocoupler.When shading strip 6 (see figure 2)s on being installed in piston are lower than grooved optocoupler U3, U3 optical receiving end ce conducting, the P2 point is a low level, and when shading strip 6 (see figure 2)s covered the luminous end of grooved optocoupler, optical receiving end ce disconnected, and the P2 point is a high level.Because grooved optocoupler U3 is not a switching tube completely, the difference of shading degree can cause the difference of grooved optocoupler U3 optical receiving end ce conducting degree, so the voltage of P2 point output compares with a fixed voltage (being produced through dividing potential drop by R5 and R6) through U2 comparator LM311, thereby the generation low level is delivered to the input port P3.0 pin of single-chip microcomputer and is detected position of piston.
Cuff pressure detects
Because that adopt is the air pressure probe S1 (model is SCX15DN) of bridge type, so adopt the instrument integrated amplifier of high input impedance, low output impedance, A1 amplifier OP27, A2 amplifier OP27 form first order differential type circuit, and A3 amplifier OP27 forms second level difference channel.Because it all is OP27 that A1, A2 adopt, so their common mode output voltage and drift voltage also all equate, the differential type circuit of forming by A3 amplifier OP27 can be cancelled out each other, so it has very strong common mode rejection ratio ability and less output drift voltage again.Carry out filtering by the secondary low pass Butterworth filter of forming by A4 amplifier OP27 then, remove high-frequency interferencing signal, at last amplifying signal is delivered to U1 analog-digital converter AD574 and carried out mould/number conversion.
With MCU and FPGA is core control circuit
Because the magnificent nation single-chip microcomputer that uses has very strong external bus extended capability, so single-chip microcomputer W78E052 and FPGA (EPF10K10) interface adopts bus mode, the P0 of single-chip microcomputer, P2, WR, RD and ALE link to each other with the I/O mouth of FPGA.Single-chip microcomputer is read the result of analog-digital converter AD574 conversion cuff pressure by data/address bus, single-chip microcomputer W78E052 sends out the order of control motor for FPGA (EPF10K10) then, on LCD, draw simultaneously pressure history, FPGA utilizes the characteristics of its high-speed parallel, by the motion of motor driver DCM4010 control motor-driven piston, thereby alleviated the work load of MCU, also guaranteed the precision of system.If single-chip microcomputer detects pressure when excessive, be the protection pressure transducer, FPGA (EPF10K10) control electromagnetic valve (electromagnetic valve model is UNMP30) is exitted.Because the operating current of electromagnetic valve UNMP30 is bigger, so adopt the ULN2003 of withstand voltage height, big electric current darlington array, it can directly link to each other with Transistor-Transistor Logic level under the running voltage of 5V.
Application result
Through verification experimental verification, draw: this calibrating installation standard blood pressure simulation, heart rate simulated performance are good, stable.
Claims (3)
1. based on the blood pressure instrument calibrating installation of oscillographic method, it is characterized in that cylinder (12) inner chamber has air bag (13) to be communicated with cuff gas circuit (15) through steam vent (14), cylinder is connected with pillar (4), pillar (4) is connected with linear stepping motor (1), there is shading strip (6) to cooperate on the motor screw axle (3) with position sensor (5), motor screw axle (3) is connected with the screwed hole of piston (8), piston (8) is positioned on the air bag (13), circuit board (7) is fixed in casing outer wall, position sensor on it (5), gapped between the internal chamber wall of the sidewall of piston (8) and cylinder (12), position sensor (5) is connected with single-chip microcomputer, single-chip microcomputer is connected with programmable gate array, there is pressure transducer S1 to be connected with programmable gate array with single-chip microcomputer on the cuff gas circuit (15) through mould one number converter U1, programmable gate array is connected with linear stepping motor (1) through motor driver, is connected with electromagnetic valve on the cuff gas circuit (15) through drive circuit.
2. device according to claim 1, be characterised in that pressure transducer S1 is connected with analog-digital converter U1 through integrated amplifier, integrated amplifier is formed first order difference channel by amplifier A1, A2, and the output of first order difference channel is imported analog-digital converter U1 again through the second level difference channel that amplifier A3 forms after the secondary low pass filter filtering that amplifier A4 forms.
3. device according to claim 1, be characterised in that position sensor (5) is made up of comparator U2 and grooved optocoupler U3, the optical receiving end of grooved optocoupler and the light between the luminous end can be interdicted by shading strip (6), the output of optical receiving end connects comparator U2 end of oppisite phase, comparator U2 positive termination fixed voltage, comparator U2 output connects single-chip microcomputer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201701152U CN201675933U (en) | 2010-04-26 | 2010-04-26 | Blood pressure gauge calibration device based on oscillography |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201701152U CN201675933U (en) | 2010-04-26 | 2010-04-26 | Blood pressure gauge calibration device based on oscillography |
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| Publication Number | Publication Date |
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| CN201675933U true CN201675933U (en) | 2010-12-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010201701152U Expired - Fee Related CN201675933U (en) | 2010-04-26 | 2010-04-26 | Blood pressure gauge calibration device based on oscillography |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103222861A (en) * | 2013-05-20 | 2013-07-31 | 秦皇岛市康泰医学系统有限公司 | Non-invasive blood pressure simulation system and implementation method thereof |
| CN103424324A (en) * | 2012-05-15 | 2013-12-04 | 中国石油天然气股份有限公司 | Scratch-resistance performance tester for lever-type pipeline coating |
-
2010
- 2010-04-26 CN CN2010201701152U patent/CN201675933U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103424324A (en) * | 2012-05-15 | 2013-12-04 | 中国石油天然气股份有限公司 | Scratch-resistance performance tester for lever-type pipeline coating |
| CN103222861A (en) * | 2013-05-20 | 2013-07-31 | 秦皇岛市康泰医学系统有限公司 | Non-invasive blood pressure simulation system and implementation method thereof |
| CN103222861B (en) * | 2013-05-20 | 2015-05-27 | 康泰医学系统（秦皇岛）股份有限公司 | Non-invasive blood pressure simulation system and implementation method thereof |
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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: 20101222 Termination date: 20110426 |