CN2429107Y

CN2429107Y - Electronic sphygmomanometer with sectional aerator

Info

Publication number: CN2429107Y
Application number: CN 00221024
Authority: CN
Inventors: 吴群
Original assignee: BIOX INSTRUMENTS Co Ltd
Current assignee: BIOX INSTRUMENTS Co Ltd
Priority date: 2000-07-12
Filing date: 2000-07-12
Publication date: 2001-05-09
Anticipated expiration: 2010-07-12

Abstract

The utility model provides an electronic sphygmomanometer with relatively simple structure and convenient manufacture, which comprises an air sac, an inflation pump, a deflation valve, a power driving device, a sensor, an amplifying circuit and a single-chip microcomputer. The utility model is characterized in that the utility model comprises a subsection inflation speed regulation circuit. The single-chip microcomputer is connected with the inflation pump and an air pipe via the subsection inflation speed regulation circuit. The subsection inflation speed regulation circuit is a pulse width modulation circuit controlled by the single-chip microcomputer or a linear element voltage regulating circuit controlled by the single-chip microcomputer or a nonlinear element voltage regulating circuit controlled by the single-chip microcomputer. The utility model is characterized in convenient operation, simple structure, high measurement precision, etc.

Description

The electric sphygmomanometer of segmentation inflated type

This utility model provides the electric sphygmomanometer that a kind of structure is simple relatively, be convenient to make.

By the control model classification that charges and discharge gas, existing electric sphygmomanometer mainly contains 3 kinds: (1) fast aeration, sampling and measurement to blood pressure information are finished in approximate slowly venting continuously at the uniform velocity in deflation course.(2) fast aeration, sampling and measurement to blood pressure information are finished in the controlled venting of segmentation in the segmentation deflation course.(3) approximate slow continuous charge at the uniform velocity, sampling and measurement to blood pressure information are finished in venting fast in slow continuous charge process.The major defect of these several control models is: pattern (1) is difficult to the venting flow-control must be applicable to different testees, pattern (2) needs the vent valve of high-speed, high precision or more than a vent valve, the circuit that pattern (3) is difficult to eliminate in the gas replenishment process disturbs and the gas circuit interference.

The purpose of this utility model is the electric sphygmomanometer of a kind of segmentation inflated type of design, makes the blood pressure measurement process be easy to accurate control, and simplifies the design and the manufacturing of electric sphygmomanometer.

Its main technical schemes comprises air bag, inflator pump, vent valve, power drive device, pick off, amplifying circuit and single-chip microcomputer, it is characterized in that it comprises segmentation inflation alignment circuit, and single-chip microcomputer is connected to inflator pump and air bag by segmentation inflation alignment circuit.

Described segmentation inflation alignment circuit is to be subjected to monolithic processor controlled pulse-width modulation circuit, or is subjected to monolithic processor controlled linear element regulating circuit, or is subjected to monolithic processor controlled non-linear element regulating circuit.

The segmentation inflation alignment circuit of described pulse-width modulation type is the built-in pulse-width modulation circuit of single-chip microcomputer, or the pulse-width modulation circuit that is connected with single-chip microcomputer outside single-chip microcomputer, and it is connected to the inflation pump motor through the power drive device.

The segmentation of described linear element pressure-adjustable type inflation alignment circuit is the motor in series that is used for linear element and the inflator pump of adjust blood pressure, and is connected with transistor as the bypass electrical switch, and electrical switch passes through interface circuit and/or directly links to each other with single-chip microcomputer.

The segmentation inflation alignment circuit of described non-linear element pressure-adjustable type is the motor in series that is used for the non-linear element and the inflator pump of adjust blood pressure, and be connected with transistor as the bypass electrical switch, electrical switch is through interface circuit and/or directly link to each other with single-chip microcomputer.

Connecting display 10, memorizer 11 and communication interface 12 on the bus of single-chip microcomputer or on the I/O port respectively.

Control inflator pump by segmentation inflation alignment circuit by it is built-in (or sheet outer) for single-chip microcomputer, it is pressurizeed to airbag aeration, monitor the pressure in the air bag simultaneously, in case reach first threshold value, promptly suspend inflation, the sampling arteriopalmus information (minor fluctuations of pressure, or Ke Shi sound), and then be pressurized to second threshold value to airbag aeration, suspend inflation once more, sampling arteriopalmus information.Carry out so repeatedly after single-chip microcomputer judges to continue pressurization, opening the vent valve venting immediately, calculate measured's systolic pressure, diastolic pressure, mean pressure, arteries and veins rule then according to the blood pressure information of being sampled.

Advantage of the present utility model is: control inflator pump by segmentation inflation alignment circuit by it is built-in (or sheet outer) for single-chip microcomputer, can adapt to different measurands, makes the inflation pressurization reach the threshold value in each stage.And these threshold values all are self-adjusting according to the characteristics of different objects by single-chip microcomputer.

Of the present utility model being also advantageous in that: finish sampling and measurement in the time-out process behind each graduated charge, avoided the circuit in the gas replenishment process to disturb and the gas circuit interference to blood pressure information.Whether sampled measurements with to charge and discharge gas speed evenly irrelevant, avoided the technological difficulties of at the uniform velocity inflation or venting.

Of the present utility model being also advantageous in that: utilize relatively inexpensive normal elements just can realize the inflation of stagewise, reduced manufacturing cost.

Fig. 1 is a circuit block diagram of the present utility model.

Fig. 2 is the digital circuit schematic diagram.

Fig. 3 is the analog circuit schematic diagram.

Fig. 4 is the schematic diagram of the segmentation inflation alignment circuit of linear element pressure-adjustable type.

Fig. 5 is the schematic diagram of the segmentation inflation alignment circuit of non-linear element pressure-adjustable type.

In Fig. 1, single-chip microcomputer 1 is connected to power drive device 3 by segmentation inflation alignment circuit 2, is connected to inflation pump motor 4, is connected to air bag 5 by gas circuit again.Pick off 6 is the pressure transducers that are placed in the gas circuit, or pressure transducer+Ke Shi sound sensor, and it is connected to amplifying circuit 7, and the induced signal of pick off institute is through being amplified into A/D converter 8, is read by single-chip microcomputer 1 after being converted into digital signal.Vent valve 9 is connected to single-chip microcomputer, the air in the air bag that is used for giving out light when one-shot measurement finishes.Display 10 and memorizer 11 and communication interface 12 all are connected on the bus of single-chip microcomputer or on the I/O port, finish demonstration, storage and the function of exchange of information.

In Fig. 2, U4 is single-chip microcomputer S87C552-4B (corresponding to 1 among Fig. 1), its inner integrated pulse-width modulation circuit (PWM) is as segmentation inflation alignment circuit (corresponding to 2 among Fig. 1), its lead-out terminal PWM0 is connected to power drive device T1 (TPS1110) (corresponding to 3 among Fig. 1), is connected to inflation pump motor MOT1 (corresponding to 4 among Fig. 1).A/D converter (corresponding to 8 among Fig. 1) and serial communication interface (corresponding to 12 among Fig. 1) have been integrated in single-chip microcomputer U4 inside, the P5 mouth of single-chip microcomputer is input end of analog signal of the multi-channel a/d converter in the sheet, and P5.0 and P5.1 are connected to the outfan of amplifying circuit.Mouth position P3.0, the P3.1 of single-chip microcomputer are the serial communication interface input and output terminals.U5 is lattice lcd display LCD0861 (corresponding to 10 among Fig. 1), is used for display working condition and measurement result, and it is connected on the bus of single-chip microcomputer.K1, K2 are 2 buttons, are used for the input operation instruction, and they are connected to the I/O mouth P3.4 of single-chip microcomputer, P3.5.U2 (74HC373) is an address latch, and U3 (62256) is 32KB static RAM (SRAM) memorizer (corresponding to 11 among Fig. 1), as computing working area and storage area as a result.U2 and U3 are connected on the bus of single-chip microcomputer.The I/O mouth P1.7 of single-chip microcomputer is by low-power transistor T1 control vent valve RLY (corresponding to 9 among Fig. 1).U1 (IMP810) is an electrify restoration circuit.

In Fig. 3, W1 and W2 are low-dropout linear voltage-regulating circuit (TPS7301), and (VCC, GND) (AVDD, AVSS), W3 is the virtual earth generator, is used for producing simulation ground AVEE with the analog circuit power supply to produce the digital circuit power supply respectively.The signal that the sensors A IR1 (corresponding to 6 among Fig. 1) of inner integrated temperature-compensating and amplifying circuit produces minute is done 2 the tunnel: the one tunnel through resistance R 11, enters the sub-P5.0 of input end of analog signal of the A/D converter among Fig. 2 after the R12 dividing potential drop.Another road is through U28A, U28B, and U29A, the ac amplifier circuit that U29B formed (corresponding to 7 among Fig. 1) enters the sub-P5.1 of input end of analog signal of the A/D converter among Fig. 2 at last.In ac amplifier circuit, U28A and U28B and peripheral components thereof constitute high pass filter, and U29B and peripheral components thereof constitute low pass filter, and U29A and peripheral components thereof are finished final stage and amplified.

In Fig. 4, resistance R 20 to R27 is and the placed in-line linear voltage regulation element of inflator pump motor M OT1, transistor Q20 to Q27 is respectively the bypass electrical switch of R20 to R27, and their base stage is connected to the outfan Y0 to Y7 of decoding circuit U20 (74HC138) through current-limiting resistance.The I/O port that input A, the B of decoding circuit U20 (74HC138), C are connected to single-chip microcomputer.When single-chip microcomputer when 2 different systems of decoding circuit output are counted, can the different bypass electrical switch of gating, cause the driving voltage difference of inflator pump motor, thereby reach the purpose of speed governing.

In Fig. 5, diode D20 to D27 is and the placed in-line non-linear voltage regulation component of inflator pump motor M OT1, transistor Q20 to Q27 is respectively the bypass electrical switch of D20 to D27, and their base stage is connected to the outfan Y0 to Y7 of decoding circuit U20 (74HC138) through current-limiting resistance.The I/O port that input A, the B of decoding circuit U20 (74HC138), C are connected to single-chip microcomputer.When single-chip microcomputer when 2 different systems of decoding circuit output are counted, can the different bypass electrical switch of gating, cause the driving voltage difference of inflator pump motor, thereby reach the purpose of speed governing.

Claims

1, a kind of electric sphygmomanometer, comprise air bag, inflator pump, vent valve, power drive device, pick off, amplifying circuit and single-chip microcomputer, it is characterized in that it comprises segmentation inflation alignment circuit, single-chip microcomputer is connected to inflator pump and air bag by segmentation inflation alignment circuit.

2, electric sphygmomanometer according to claim 1, it is characterized in that: segmentation inflation alignment circuit is to be subjected to monolithic processor controlled pulse-width modulation circuit, or be subjected to monolithic processor controlled linear element regulating circuit, or be subjected to monolithic processor controlled non-linear element regulating circuit.

3, electric sphygmomanometer according to claim 2, the segmentation inflation alignment circuit that it is characterized in that described pulse-width modulation type is the built-in pulse-width modulation circuit of single-chip microcomputer, or the pulse-width modulation circuit that outside single-chip microcomputer, is connected with single-chip microcomputer, it is connected to the inflation pump motor through the power drive device.

4, electric sphygmomanometer according to claim 2, the segmentation inflation alignment circuit that it is characterized in that described linear element pressure-adjustable type is the motor in series that is used for the linear element and the inflator pump of adjust blood pressure, and be connected with transistor as the bypass electrical switch, electrical switch is through interface circuit and/or directly link to each other with single-chip microcomputer.

5, electric sphygmomanometer according to claim 2, the segmentation inflation alignment circuit that it is characterized in that described non-linear element pressure-adjustable type is the motor in series that is used for the non-linear element and the inflator pump of adjust blood pressure, and be connected with transistor as the bypass electrical switch, electrical switch is through interface circuit and/or directly link to each other with single-chip microcomputer.

6, electric sphygmomanometer according to claim 1 is characterized in that connecting display 10, memorizer 11 and communication interface 12 on the bus of single-chip microcomputer or on the I/O port respectively.