CN2212966Y - Hand-held electrocardiogram analyzer - Google Patents

Abstract

The utility model relates to a hand-held electrocardiogram analyzer which is a medical appliance controlled by a monolithic microcomputer and displaying electrocardiogram images and texts by a lattice type liquid crystal screen. The utility model integrates survey, lead, signal amplification, processing, display and power supply and is convenient in use in any time and place. The utility model is composed of a plastic casing, circuits, a liquid crystal display and power supply batteries. Electrocardiosignals on the body surface are picked up by an electrode arranged at the back surface of the casing and then carry out analog-digital conversion, calculation, analysis and signal storage by the monolithic computer after is magnified and filtered; under the control of a program, the liquid crystal display displays waves and parameters of the electrocardiogram and analytical results of cardiac rhythm in real time and playback way. All text display items be fitted with Chinese-English reference display pages. The power supply batteries arranged in the electrocardiogram analyzer can be charged repeatedly.

Description

Hand-held electrocardiogram analyzer

This utility model belongs to medical apparatus and instruments, be a kind of can be by ecg measurement, demonstration and the analytical tool of doctor or patient's hand-held.

Conventional electrocardiograph, it no matter is the computerized electrocardiograph that the electrocardiograph (carrying out the electrocardiogram parameter by the doctor by recording paper strip measures) of function singleness still utilizes the computer technology assistant analysis, all must allow patient lie in bed, install and carry out ecg signal acquiring, record after limbs and chest lead.This is in many occasions, indagation needs of racing against time during first aid for example, the restriction of and weight specifically long-pending to carrier etc. when supply of electric power inconvenience and tools for doctor home visit when the environment that jolts on the ambulance, narrow space, open-air rescue, making the routine electrocardiogram machine be difficult to performance should have effect.The inpatient can carry out long-term continuous monitoring to its electrocardiosignal under a kind of instrument that is called electrocardiogram monitor is nursed.This instrument can only be installed in equipment advanced person's the ward so far; Non-inpatient can carry the electro-cardiograph of a kind of Holter of being called, and continuous record reaches 24 hours ECG signal, but must do retrospective analysis to the signal that is write down by the dedicated computer system of hospital.Though these methods have his own strong points, all can not accomplish whenever and wherever possible electrocardiogram is carried out fast, hand-heldly measures and analyze, lose many diagnosis and treatment opportunitys.

The purpose of this utility model promptly make a kind of integrate measure lead, signal amplification, storage, demonstration, supplying cell, and realize multiple functions such as computing, analysis, diagnosis by microprocessor in the machine can be by doctor or the patient hand-held electrocardio map analysis instrument of handled easily whenever and wherever possible.

Principle of compositionality of the present utility model as shown in drawings.Comprise that analogue signal is amplified, the treatment circuit part, computer control (digital circuit) part and liquid crystal display part, the analogue signal amplification treatment circuit is made of typical ecg signal amplifier and wave filter.Owing to adopt the self-contained battery power supply and needn't install and measure the lead-in wire that leads (measurement electrode is installed in the tool housing back side), select high-performance integrated operational amplifier chip for use in addition, its circuit characteristic is better than the routine electrocardiogram machine, 80 decibels of common mode rejection ratios, input impedance is greater than 20 megaohms, Hz-KHz 0.05-100 hertz.Work such as signal sampling, analog digital conversion, operational analysis, feature extraction, demonstration control, signal storage and power down protection are partly finished in computer control, are made of a slice high-performance single chip microcomputer and read-only memory, random access memory (RAM).Liquid-crystal display section adopt have Drive and Control Circuit, can with the modularity dot matrix lcd of computer interconnection.More than three parts under the control of the computer program of a special use, realize following function: electrocardiogram refreshes mode and shows; electrocardiogram freezes to show; freeze the back local enlargement display; the electrocardiogram playback shows; Characteristics of electrocardiogram parameter (heart rate; the QRS ripple is wide; the PR interval; the R wave amplitude) literal shows; cardiac cycle order and non-order rectangular histogram show; arrhythmia analysis; report to the police; the long preservation (power down protection is arranged) of electrocardiogram typical segments (in a display page) and extraction show and the prompting of push button function menu text shows.In literal shows, the bilingual page or leaf is arranged, easy to use.When electrocardiographic abnormality took place, program also showed pathology and the conventional diagnosis and treatment measure that this is unusual automatically, for your guidance.

This utility model structurally is made up of four parts: shell, circuit, liquid crystal display screen and battery.The shell that is adopted is by the injection mo(u)lding of ABS engineering plastics, and its external form is approximately cuboid, is the long limit of rectangle up and down, about be the rectangle minor face, length and width, thick size are about 18 * 10 * 3 cubic centimetres.Its left side is narrower, is not more than 8 centimetres, and in position makes the gabarit depression, is convenient to operator left side hand-held set and measures.Be provided with five buttons in lower right, shell front, be convenient to operator's right hand and press.For in measurement not reason action button strength excessive, influence electrode and patient's body surface contact pressure and cause the electrocardiogram artefact, the button on the shell connects by the microminiature microswitch on the wiring board in accurate helical spring and the machine.Three holes are arranged at the shell back side, be directly installed on measurement electrode on the wiring board in order to exposure.Circuit part comprises simulation and digital circuit (computer and peripheral circuit), is installed on the wiring board, and connects with liquid crystal display device module by 20 pin connectors.Liquid crystal display adopts the dot lcd screen composite module of state's productions such as Japan, and LCDs and Drive and Control Circuit have been packaged in one.Supplying cell is No. five rechargeable batteries of four joints, places in the machine, is provided with the charging socket on shell.In addition, on shell, also be provided with can be online with any electrocardiograph socket so that with the storage electrocardiosignal trace on paper tape.

An exemplary embodiments of the present utility model, as shown in drawings.Ecg signal amplifier adopts LF444, LF353 operational amplifier, and wherein the A1-1 among the LF444, A1-2 and A1-3 constitute the high input impedance difference amplifier, and A1-4 is a low pass filter; The A2-1 of LF353 makes the ECG signal of A1-4 output be amplified to enough amplitudes, and through the voltage follower that A2-2 constitutes the ECG signal is received the input end of analog signal ADCO of single-chip microcomputer 87C552, so that carry out mould one number conversion under programmed instruction.Analog circuit of the present utility model also comprises integrator and the low pass filter that is made of LF353, wherein A3-1 constitutes integrator, its input is received the PWMO end of single-chip microcomputer 87C552, under the program effect, this terminal is the outfan of several mould conversions, export with analog signal form in order to the ECG signal that under the ECG playback state, will be stored in the machine, be used to drive paper film recorder; A3-2 makes signal after the conversion of several moulds recover original frequency band and the low pass filter established.Digital circuit of the present utility model partly is to be the pico computer minimum system of core with single chip microcomputer 87C552, and the periphery of 87C552 has been expanded 3 chips altogether: address latch 74LS573, memory under program 27C256 and data memory 62C256; This microcomputer minimum system also with liquid crystal display device module DMF5005 interface.The data of single-chip microcomputer 87C552/low order address line AD0～AD7 is connected respectively on data input (going out) end of 74LS573,27C256,62C256 and DMF5005, the composition data bus; Under the effect of " address latch permission " control line ALE of 87C552,74LS573 latchs the low order address information of AD0～AD7, and is connected on low order address line A0～A7 of 27C256,62C256, constitutes low eight of address bus; A8～A15 of 87C552 directly is connected on the high address line of 27C256,62C256, constitutes the high eight-bit of address bus; Control line in this system also comprises: the PSEN of 87C552 connects and enables terminal OE to 27C256, read-write control line RD, the WR of 87C552 meets read-write control end RD, the WR to 62C256 and DMF5005 respectively, low order address line A0 in the address bus meets the data/order control end C/D to DMF5005, A15 in the address bus connects to DMF5005 " display enables " through phase inverter and holds CE, and single-chip microcomputer 87C552 reset line RST meets the reset line RST to DMF5005; The P1.0 of 87C552～1.4 connect respectively to four functional keys K1～K4 that are loaded on the shell, and the latter's position is corresponding one by one with the function menu that liquid crystal display screen shows, are convenient to operation.

Claims (2)

1, hand-held electrocardio map analysis instrument belongs to medical apparatus and instruments, constitute by shell, simulation and digital circuit, liquid crystal display and rechargeable battery, it is characterized in that collective schedule ecg signal acquiring, amplification, treatment circuit, microcomputer system, display and electric power system are in one; Its shell is by the engineering plastics injection mo(u)lding, length and width, thickly be of a size of 18 * 10 * 3 cubic centimetres, its left side is narrower, is not more than 8 centimetres, and in position makes the gabarit depression, being convenient to left hand-held set measures, be provided with five buttons in lower right, shell front, be convenient to operator's right hand and press, the button on the shell connects by the microminiature microswitch on the interior wiring board of accurate helical spring and machine respectively, at the shell back side three holes are arranged, be directly installed on the measurement electrode of wiring board in order to exposure; Circuit part comprises simulation and digital circuit, is installed on the wiring board, and connects with liquid crystal display device module by 20 pin connectors; Liquid crystal display adopts the dot lcd screen composite module of state's productions such as Japan, and its display screen and Drive and Control Circuit have been packaged in one; Supplying cell is No. five rechargeable batteries of four joints, places in the machine, is provided with the charging socket on shell; On shell, also be provided with can be online with any electrocardiograph socket, in order to the storage electrocardiographic wave trace on paper tape.

2, hand-held electrocardio map analysis instrument according to claim 1, it is characterized in that artificial circuit part comprises the electrocardiosignal amplification that is made of six operational amplifiers, treatment circuit, wherein first three operational amplifier formation has the prestage of high input impedance, three operational amplifiers constitute low pass filter respectively in addition, voltage amplifier and voltage follower, its ECG signal of exporting is received the input end of analog signal ADCO of single-chip microcomputer 87C552, so that under programmed instruction, carry out mould one number conversion, artificial circuit part also comprises integrator and the low pass filter that is made of two operational amplifiers, the input of integrator is received the PWMO end of single-chip microcomputer 87C552, under the program effect, this terminal is several mould conversion outfans, export with analog signal form in order to the ECG signal that will be stored in the machine, trace recording paper strip, low pass filter is right after integrator, makes the signal after several moulds are changed recover original frequency band; Digital circuit partly is to be the pico computer minimum system of core with single chip microcomputer 87C552, the periphery of 87C552 has been expanded 3 chips altogether: address latch 74LS573, memory under program 27C256 and data memory 62C256, this microcomputer minimum system also with the liquid crystal display device module interface; The data of single-chip microcomputer 87CC552/low order address line AD0～AD7 is connected to the data of 74LS573,27C256,62C256 and liquid crystal display device module and imports/composition data bus on going out to hold, under the effect of 87C552 control line ALE, 74LS573 latchs the low order address information of AD0～AD7, and be connected on low order address line A0～A7 of 27C256,62C256, what constitute address bus hangs down eight, A8～A15 of 87C552 directly is connected on the high address line of 27C256,62C256, constitutes the high eight-bit of address bus; The control line of this system also comprises: the PSEN of 87C552 meets the Enable Pin OE to 27C256, read-write control line RD and WR connect the read-write control end to 62C256 and liquid crystal display device module respectively, A0 in the address bus meets the data/order control end C/D to display apparatus module, A15 in the address bus meets Enable Pin CE to display apparatus module through phase inverter, single-chip microcomputer 87C552 reset line RST connects to the display apparatus module reset terminal, P1.0～P1.4 of 87C552 connects respectively to four functional keyss that are loaded on the shell, the latter's position is corresponding one by one with the function prompt menu that liquid crystal display screen shows, is convenient to operation.

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