Overpressure protection device for blood pressure measurement

Abstract

The overpressure protection device comprises a pressure sensor U2, a filtering and amplifying circuit, a single-chip microcomputer and an air valve, the pressure sensor U2 is connected with a cuff air bag of a blood pressure measuring instrument through an air pipe, the filtering and amplifying circuit is connected with the pressure sensor U2 and the single-chip microcomputer, the single-chip microcomputer is connected with the air valve, and the air valve is connected with the pressure sensor U2. The air valve is arranged on the air pipe, and the filtering and amplifying circuit obtains a pressure value from the pressure sensor U2 and converts the pressure value into a digital signal through the single-chip microcomputer. The utility model has the beneficial effects that the air valve is arranged on the air pipe of the blood pressure detection instrument, and the pressure sensor is directly connected with the air pipe, so that the blood pressure detection instrument is suitable for being mounted on a blood pressure cuff, the pressure sensor is more sensitive in sensing, the air valve is more efficiently controlled, and the blood pressure detection instrument is more convenient to use. Accidental injury in the blood pressure measuring process is effectively prevented; and the device is simple in structure, low in cost and convenient for market popularization.

Description

TECHNICAL FIELD

[0001] The utility model relates to blood pressure monitoring instrument technical field, specifically for a kind of overvoltage protection device for blood pressure measurement. BACKGROUND

[0002] The protection function built-in in electronic sphygmomanometer, blood pressure monitor (patient monitor), dynamic sphygmomanometer. Electronic sphygmomanometer product is generally designed with overvoltage protection design when designing. The overvoltage protection design of prior art is connected with the air pipe of measuring instrument by a hose, the pressure value in the air pipe of measuring instrument is obtained by the hose, then whether there is pressure out of range is judged according to the pressure value and then protection is started. However, the electronic sphygmomanometer of this kind of cuff and host adopts split design, and the following problems exist:

[0003] 1, when air pipe is bent, the gas in cuff is blocked by the bending part of air pipe, and the gas in cuff cannot be discharged through air valve.

[0004] 2, when pressure sensor fails or circuit fails or processor is dead, the protection circuit built-in in electronic sphygmomanometer is invalid, and protection cannot be provided.

[0005] 3, when measurement fails, the cuff pressure may exceed maximum inflation time when electronic sphygmomanometer is repeatedly tested, and then harm is brought to patient. INVENTION CONTENTS

[0006] The utility model aims at providing an overvoltage protection device for blood pressure measurement to solve the problems raised in the above background.

[0007] To achieve the above object, the utility model provides the following technical scheme: an overvoltage protection device for blood pressure measurement, including pressure sensor U2, filter amplification circuit, single-chip microcomputer and air valve, characterized by: the pressure sensor U2 is connected with the cuff air bag of blood pressure measuring instrument through air pipe, the filter amplification circuit is connected with pressure sensor U2 and single-chip microcomputer, the single-chip microcomputer is connected with air valve, the air valve is arranged on air pipe, the filter amplification circuit obtains pressure value from pressure sensor U2 and converts pressure value into digital signal by single-chip microcomputer.

[0008] Preferably, the single-chip microcomputer is further connected with buzzer.

[0009] Preferably, it further includes display screen, the display screen is connected with single-chip microcomputer, and the size of the display screen is 128*64.

[0010] Preferably, the single-chip microcomputer is further connected with control button.

[0011] Preferably, the filter amplification circuit comprises a common mode filter circuit, an amplification circuit and an active filter circuit, the common mode filter circuit is connected with the pressure sensor U2, the amplification circuit is connected with the common mode filter circuit, and the active filter circuit is connected with the amplification circuit.

[0012] Preferably, the amplification circuit comprises an amplifier U1, a capacitor C5 and a gain resistor R1, the gain resistor R1 is connected with the amplifier U1, and the amplifier U1 is connected with the power supply through the capacitor C5.

[0013] Preferably, the common mode filter circuit comprises resistors R2 and R3 and capacitors C1 and C2, the resistors R2 are respectively connected with the pressure sensor U2 and the amplifier U1, the resistors R3 are respectively connected with the pressure sensor U2 and the amplifier U1, the capacitors C1 and C2 are connected in series, one end of the capacitor C1 is connected with the resistor R2, and one end of the capacitor C2 is connected with the resistor R3.

[0014] Preferably, the active filter circuit comprises an amplifier U3-c, resistors R4 and R5, a capacitor C6 and a capacitor C7, the resistors R4 and R5 are connected in series, one end of the resistor R4 is connected with the output end of the amplifier U1, one end of the resistor R5 is connected with the input end of the amplifier U3-c, the end connected with the resistors R4 and R5 is connected with the capacitor C6, and the resistor R5 and the amplifier U3-c are connected with the ground through the capacitor C7.

[0015] Compared with the prior art, the beneficial effects of the blood pressure detection instrument are as follows: the air valve is arranged on the air pipe of the blood pressure detection instrument, the pressure sensor is directly connected with the air pipe, the blood pressure detection instrument is suitable for being installed on a blood pressure sleeve, the sensing of the pressure sensor is more sensitive, the control of the air valve is more efficient, and accidental injuries in the blood pressure measurement process are effectively prevented; and the blood pressure detection instrument has the advantages of simple structure, low cost and convenient market promotion. BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 Fig. 1 is a structural schematic diagram of the blood pressure detection instrument;

[0017] Fig. 2 Fig. 4 is a circuit principle diagram of the filter amplification circuit of the blood pressure detection instrument. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0019] Please refer toFigs. 1-2 The utility model provides a kind of technical scheme: a kind of overvoltage protection device for blood pressure measurement, including pressure sensor U2, filter amplification circuit 100, single-chip microcomputer 200 and air valve 300, pressure sensor U2 is connected the cuff airbag of blood pressure measuring instrument by trachea 400 (the trachea is blood pressure measuring instrument gas itself's trachea), filter amplification circuit 100 pressure sensor U2 and single-chip microcomputer 200 respectively, single-chip microcomputer 200 connects air valve 300, air valve 300 is located on trachea 400, filter amplification circuit 100 obtains pressure value from pressure sensor U2 and transmits to single-chip microcomputer 200 after converting pressure value into digital signal, single-chip microcomputer 200 monitors that pressure value exceeds range or pressure value duration exceeds range, and single-chip microcomputer 200 starts air valve 300 to bleed, and the pressure of airbag is released to 2mmHg below, guarantees the use safety of patient.Pressure sensor U2 is high-performance pressure sensor, and voltage is provided by high-stability voltage reference source, effectively eliminates the influence of voltage fluctuation, and accuracy can be improved.

[0020] In an embodiment of the utility model, the utility model uses low-power consumption design (for example, air valve uses normally closed design), and power supply is derived from 2 pieces of 7 alkaline batteries, and two pieces of alkaline 7 batteries can continuously power the utility model for 6 months.

[0021] In an embodiment of the utility model, single-chip microcomputer 200 is also connected with buzzer 500, and single-chip microcomputer 200 starts buzzer 500 while opening air valve 300 after monitoring that pressure value exceeds range, and medical staff is reminded to handle in time.

[0022] In an embodiment of the utility model, the utility model further includes display screen 600, and display screen 600 is connected with single-chip microcomputer 200, and the size of display screen 600 is 128*64, and display screen 600 can display real-time pressure, maximum pressure and the time that pressure exceeds limit duration etc.

[0023] In an embodiment of the utility model, single-chip microcomputer 200 is also connected with control button 700, and control button 700 is as input end to input the parameter required when the utility model works to make single-chip microcomputer 200 control air valve 300.

[0024] In an embodiment of the utility model, filter amplification circuit 100 includes common-mode filter circuit, amplification circuit and active filter circuit, and common-mode filter circuit is connected with pressure sensor U2, amplification circuit is connected with common-mode filter circuit, and active filter circuit is connected with amplification circuit.

[0025] In an embodiment of the utility model, the amplification circuit includes amplifier U1, capacitor C5 and gain resistance R1, gain resistance R1 connects amplifier U1, and amplifier U1 is connected to power supply through capacitor C5.The amplification circuit amplifies the pressure signal collected by pressure sensor U2, and the amplifier U1 is a self-stable zero type instrument amplifier with low offset voltage, which effectively eliminates the influence of offset voltage drift and makes the measured pressure value more accurate.

[0026] In an embodiment of the utility model, the common mode filter circuit includes resistance R2, resistance R3, capacitor C1 and capacitor C2, resistance R2 is connected with pressure sensor U2 and amplifier U1 respectively, resistance R3 is connected with pressure sensor U2 and amplifier U1 respectively, capacitor C1 and capacitor C2 are connected in series, one end of capacitor C1 is connected with resistance R2, and one end of capacitor C2 is connected with resistance R3.Resistance R2, resistance R3, capacitor C1 and capacitor C2 constitute a differential mode and common mode filter circuit, which can effectively filter out high-frequency interference.

[0027] In an embodiment of the utility model, the active filter circuit includes amplifier U3-c, resistance R4, resistance R5, capacitor C6 and capacitor C7, resistance R4 and resistance R5 are connected in series, one end of resistance R4 is connected with the output end of amplifier U1, one end of resistance R5 is connected with the input end of amplifier U3-c, one end connected with resistance R4 and resistance R5 is connected with capacitor C6, and resistance R5 and amplifier U3-c are connected to ground through capacitor C7.The active filter circuit can effectively filter out high-frequency interference, and the output signal is sent to single-chip microcomputer 200 for sampling.

[0028] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. An overpressure protection device for blood pressure measurement, comprising a pressure sensor U2, a filter amplification circuit, a single-chip microcomputer and an air valve, characterized in that: The pressure sensor U2 is connected with the cuff air bag of the blood pressure measuring instrument through the air pipe, the filter amplification circuit is connected with the pressure sensor U2 and the single-chip microcomputer, the single-chip microcomputer is connected with the air valve, the air valve is arranged on the air pipe, the filter amplification circuit obtains the pressure value from the pressure sensor U2 and converts the pressure value into a digital signal by the single-chip microcomputer.

2. An overvoltage protection device for blood pressure measurement according to claim 1, characterized in that: The single-chip microcomputer is further connected with a buzzer.

3. An overvoltage protection device for blood pressure measurement according to claim 1, characterized in that: A display screen is further included, which is connected with the single-chip microcomputer, and the size of the display screen is 128*64.

4. An overvoltage protection device for blood pressure measurement according to claim 1, characterized in that: The single-chip microcomputer is further connected with a control button.

5. An overvoltage protection device for blood pressure measurement according to claim 1, characterized in that: The filter amplification circuit comprises a common-mode filter circuit, an amplification circuit and an active filter circuit, the common-mode filter circuit is connected with the pressure sensor U2, the amplification circuit is connected with the common-mode filter circuit, and the active filter circuit is connected with the amplification circuit.

6. An overvoltage protection device for blood pressure measurement according to claim 5, characterized in that: The amplification circuit comprises an amplifier U1, a capacitor C5 and a gain resistor R1, the gain resistor R1 is connected with the amplifier U1, and the amplifier U1 is grounded through the capacitor C5.

7. An overvoltage protection device for blood pressure measurement according to claim 6, characterized in that: The common-mode filter circuit comprises resistors R2 and R3, capacitors C1 and C2, the resistors R2 are respectively connected with the pressure sensor U2 and the amplifier U1, the resistor R3 is respectively connected with the pressure sensor U2 and the amplifier U1, the capacitors C1 and C2 are connected in series, one end of the capacitor C1 is connected with the resistor R2, and one end of the capacitor C2 is connected with the resistor R3.

8. An overvoltage protection device for blood pressure measurement according to claim 7, characterized in that: The active filter circuit comprises an amplifier U3-c, resistors R4 and R5, capacitors C6 and C7, the resistors R4 and R5 are connected in series, one end of the resistor R4 is connected with the output end of the amplifier U1, one end of the resistor R5 is connected with the input end of the amplifier U3-c, the end, at which the resistors R4 and R5 are connected, is connected with the capacitor C6, and the resistor R5 and the amplifier U3-c are grounded through the capacitor C7.

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