CN2220827Y

CN2220827Y - Electronic pulse thermometer

Info

Publication number: CN2220827Y
Application number: CN 94216693
Authority: CN
Inventors: 罗岩; 卢学兵
Original assignee: Guangdong Prov Medical Equipment & Instrument Research Inst
Current assignee: Guangdong Prov Medical Equipment & Instrument Research Inst
Priority date: 1994-07-12
Filing date: 1994-07-12
Publication date: 1996-02-28
Anticipated expiration: 2004-07-12

Abstract

The utility model relates to a pocket electronic pulse thermometer which can simultaneously measure body temperature and pulse and display the body temperature and the pulse on the same display by turns. A thermal resistor (1) and a piezoelectric ceramics plate (2) are combined on a minute probe by the pulse thermometer. The body temperature and the pulse are measured by human body's axilla or other parts to respectively transmit the signals to a back micro computer. The signals after treated are automatically displayed on the same display by turns at different times by the control of the micro computer. The pulse thermometer has minute volume, can be placed under the axilla to measure the body temperature as the traditional thermometer and can also simultaneously measure the pulse rate. The utility model can be duly taken out after sound alarm to obtain the body temperature value and the pulse value displayed by turns.

Description

A kind of electric body-temperature pulsimeter

This utility model relates to a kind of pocket electric body-temperature pulsimeter that can measure body temperature and pulse simultaneously.

Before this utility model, body temperature and the pulse of measuring the people generally separate, used instrument is many, operating performance is numerous and diverse, be unwell to the use of general family, body temperature, pulse, breathing polymeter were also arranged before this utility model, but its mensuration and demonstration are separately independently carried out basically, and volume is big, trivial operations.

The purpose of this utility model is that design is a kind of that can measure body temperature and pulse and it can be taken turns to be presented at automatically pocket electric body-temperature pulsimeter on the same display simultaneously.

This utility model relates to a kind of electric body-temperature pulsimeter, and it comprises; Critesistor (1), piezoelectric ceramic piece (2), micro computer (3), liquid crystal display (4), buzzer (5), battery (6), housing (7), switch (8), door oscillating circuit (I), amplification and rectification circuit (II).Critesistor (1) and piezoelectric ceramic piece (2) are installed on the front-end probe of housing (7) together, and micro computer (3), liquid crystal display (4), battery (6), switch (8) are contained in the rear end cavity of housing (7); Critesistor (1) links to each other with door oscillating circuit (I), links to each other with micro computer (3) again, and piezoelectric ceramic piece (2) links to each other with amplification and rectification circuit (II), links to each other with micro computer (3) again, and micro computer (3) links to each other with liquid crystal display (4) again.Critesistor (1) is used to experience body temperature, body temperature changes and causes the change in resistance of critesistor (1), cause the frequency of the vibration square wave that oscillating circuit produced to change, this square wave that has changed can be calculated corresponding body temperature after micro computer (3) is handled.Piezoelectric ceramic piece (2) is experienced the vibration of pulse, produces the signal of telecommunication that changes with pulse, forms pulse after the amplification of process amplification and rectification circuit (II) and the shaping, delivers to micro computer (3) and handles, and draws per minute pulse number.More than two kinds of signals of telecommunication automatically switch timesharing input micro computer again by microcomputerized control.After temperature and pulse had been surveyed, the square wave that sends certain frequency by micro computer promoted buzzing (5) and sends sound prompting and measure and finish, and simultaneously, liquid crystal display is by microcomputerized control displays temperature and pulse frequency in turn automatically.Microcomputer chip adopts NCS51 series or 48,96 series monolithics, also can adopt the single-chip microcomputer of other 8 low-power consumption.Piezoelectric ceramic piece also can adopt PVOF or PVC piezoelectric device.

As Fig. 2, the door oscillating circuit adopts four nor gates and resistance R 1, capacitor C 1, and potentiometer W1 and critesistor NTC form.The probe of this electric body-temperature pulsimeter is placed the human body oxter, conduction of heat through body temperature, the resistance of critesistor NTC changes, the square wave frequency of this oscillating circuit depends primarily on potentiometer W1, critesistor NTC and capacitor C 1, when temperature is 35 ℃, the vibration square wave frequency of output is adjusted into 250K ± 50KH2,1 ℃ of frequency change of every variation is 2.6KH2～5.2KH2, after square wave send micro computer, detect the variation of frequency by micro computer, according to frequency change and the linear principle of temperature, calculate corresponding temperature value.The door oscillating circuit also can adopt other gate circuit such as NAND gate or 555 oscillating circuits of forming.

As Fig. 3, the amplification and rectification circuit in the electric body-temperature pulsimeter of the present utility model comprises piezoelectric ceramic piece CR, phase inverter U0, U1 and comparator U2, resistance R 1, R2, R3, R4, R5, R6, R7, capacitor C 0, C1, C2, potentiometer W1.Utilize the feedback connection of CMOS phase inverter to be complementary with high output impedance used as high input impedance amplifier with piezoelectric ceramic piece, through U0, the U1 secondary obtains enough big signal after amplifying, capacitor C 0 is used for closing input every directly-heated, R1, R2 is a feedback resistance, R2 is the input resistance of two-stage amplifier, R2 and C1, R4 and C2 constitute simple integrating circuit with filtering high frequency noise signal, R5, R6 and comparator constitute hysteresis comparator, be shaped to square-wave signal with the pulse wave that will obtain and deliver to micro computer, micro computer calculates corresponding pulse frequency again through step-by-step counting.Amplification and rectification circuit also can adopt operational amplifier to constitute set fire circuit and comparison circuit.

Liquid crystal display, buzzer and micro computer directly link to each other, and send the rectangular wave drive liquid crystal display by micro computer, but not adopt three sections voltages to drive.Traditional liquid crystal display is driven by the liquid crystal driver module of special use, adopts three sections voltages to drive, the cost height, and the peripheral circuit complexity, and adopt the rectangular wave drive method, can make micro computer instead of dedicated driver module.When measurement finishes, send the sound by micro computer sender wave excitation buzzer, remind to measure to finish; The square-wave signal of being sent by micro computer dynamically drives the different character of liquid crystal display demonstration.

Fig. 1 is the structural representation of electric body-temperature sphygmometer.

Fig. 2 is the overall block-diagram of electric body-temperature sphygmometer.

Fig. 3 is the circuit diagram of an oscillating circuit.

Fig. 4 is the circuit diagram of amplification and rectification circuit.

The utility model makes and surveys body temperature and survey two kinds of functions of pulse owing to adopted microcomputerized control Can unify simultaneously to a pocket meter, and not interfere with each other, therefore, changed with Separate measurement toward body temperature with pulse, the formality trouble, the shortcoming that instrument is many is that hospital and family are protected Strong indispensable instrument.

Embodiment 1:

A kind of electric body-temperature pulsimeter is made up of critesistor (1), piezoelectric ceramic piece (2), micro computer (3), liquid crystal display (4), buzzer (5), battery (6), housing (7), switch (8), door oscillating circuit (I), amplification and rectification circuit (II); Wherein micro computer adopts the NCS51 microprocessor, and critesistor (1) adopts the highly sensitive critesistor of negative temperature coefficient, and the resistance in the time of its 25 ℃ is 10K, gets its scope at 30 to 43 ℃ when surveying body temperature.What piezoelectric transducer adopted is piezoelectric ceramic piece, and door oscillating circuit (I) adopts four nor gate U0, U1, U2, U3 and critesistor NTC and resistance R 1, and capacitor C 1, potentiometer W1 form; Amplification and rectification circuit (II) is by piezoelectric ceramic piece, phase inverter U0, U1 and comparator U2, resistance R 1, R2, R3, R4, R5, R6, R7, and capacitor C 0, C1, C2, potentiometer W1 forms, and wherein, R3 is a feedback resistance, and R2 is the input resistance of two-stage amplifier; R2 and C1, R4 and C4 constitute integrating circuit; R5, R6 and comparator constitute hysteresis comparator.

As Fig. 1, critesistor (1) and piezoelectric ceramic piece (2) are installed on bright body (7) front-end probe together, and micro computer (3), liquid crystal display (4), buzzer (5) and battery (6), switch (8) are contained in the rear end cavity of housing (7).Critesistor (1) links to each other with door oscillating circuit (I), links to each other with micro computer (3) again, and piezoelectric ceramic piece (2) links to each other with amplification and rectification circuit (II), links to each other with micro computer (3) again, and micro computer (3) links to each other with liquid crystal display (4) and buzzer (5) again.Door oscillating circuit (I) is as Fig. 3: critesistor NTC and variable potentiometer W1 series connection, the other end of critesistor NTC is connected on the input of the outfan of nor gate U2 and nor gate U3, the other end of variable potentiometer W1 is connected on the input of the outfan of nor gate U1 and nor gate U2 by capacitor C 1, resistance R 1 one terminates on the input of nor gate U0, and the other end is connected on the point of contact of capacitor C 1 and potentiometer W1; The outfan of nor gate U3 is received on the micro computer (3).Amplification and rectification circuit (II) is as Fig. 4: constitute two-stage amplifier by phase inverter U0, U1 and resistance, electric capacity, signal send comparator U2 shaping after secondary amplifies, and send micro computer to handle at last.Its liquid crystal display directly links to each other with micro computer.

Claims

1, a kind of electric body-temperature pulsimeter, it comprises: critesistor (1), piezoelectric ceramic piece (2), micro computer (3), liquid crystal display (4), battery (6), housing (7), switch (8), door oscillating circuit (I), amplification and rectification circuit (II), it is characterized in that: critesistor (1) and piezoelectric ceramic piece (2) are installed on the front-end probe of housing (7) together, and micro computer (3), liquid crystal display (4), battery (6), switch (8) are contained in the rear end cavity of housing (7); Critesistor (1) links to each other with door oscillating circuit (I), links to each other with micro computer (3) again, and piezoelectric ceramic piece (2) links to each other with amplification and rectification circuit (II), links to each other with micro computer (3) again, and micro computer (3) links to each other with liquid crystal display (4) again.

2, electric body-temperature pulsimeter according to claim 1, it is characterized in that: door oscillating circuit (I) comprising: nor gate U0, U1, U2, U3 and critesistor NTC, general resistance R 1, capacitor C 1 and variable potentiometer W1, wherein, a ground connection in two inputs of nor gate, the outfan of another input and its a last nor gate links to each other; Critesistor NTC and variable potentiometer W1 series connection, the other end of critesistor NTC is connected on the input of the outfan of nor gate U2 and nor gate U3, the other end of variable potentiometer W1 is connected on the input of the outfan of nor gate U1 and nor gate U2 by capacitor C 1, resistance R 1 one terminates on the input of nor gate U0, and the other end is connected on the point of contact of capacitor C 1 and potentiometer W1; The outfan of nor gate U3 is received on the micro computer (3).

3, electric body-temperature pulsimeter according to claim 1 is characterized in that; Amplification and rectification circuit (II) comprises piezoelectric ceramic piece CR, phase inverter U0, U1, comparator U2, with resistance R 1, R2, R3, R4, R5, R6, R7, capacitor C 0, C1, C2, potentiometer W1 wherein, constitutes two-stage amplifier by phase inverter U0, U1, by comparator U2 shaping, send micro computer (3) at last again.

4, electric body-temperature pulsimeter according to claim 1 is characterized in that: liquid crystal display (4) directly links to each other with micro computer (3), sends rectangular wave drive by micro computer (3).