CN86202592U - Wearable intelligent electrocardiograph - Google Patents

Abstract

The utility model relates to a ' wearable intelligent electrocardiograph' which has the functions that the heart rate can be displayed momentarily and continually, the over speed and under speed of the heart rate can be alarmed, the irregularity of the heart rate can be alarmed automatically and remembered, and an electrocardio signal can be recorded on a tape to provide a diagnostic reference for clinic. The utility model is characterized in using an electric voltage generated by a logarithmic generator as a signal source to display momentary heart rate, completing the pre-setting for the over speed and under speed of the heart rate by a stroke /BCD coding, and comparing with and calculating the wave width of an electrocardio R-R to realize the automatic checkout for the irregularity of ventricular rhythm. After modulating the electrocardio signal by a voltage controlled oscillator, the tape recording is proceeded.

Description

Wearable intelligent electrocardiograph

Wearing type intelligent cardiac monitoring and recording instrument is the multiple function apparatus that cardiovascular disease is carried out self-monitoring, record.

At present, generally will arrive hospital to the diagnosis of cardiovascular disease and treatment and carry out the necessary apparatus detection, because of patient's disease time is at random, symptom often disappears during detection, brings difficulty to clinical diagnosis, even affects the state of an illness adversely, causes even more serious consequence.Therefore, the electrocardio data when how to obtain the patient timely and accurately and falling ill has become the problem that present medical matters circle diagnosis and treatment cardiovascular disease needs to be resolved hurrily.

At present, comparatively general both at home and abroad is U.S. HOiTER monitor.This machine can carry out 12 or 24 hours electrocardio magnetic recording, carries out the electrocardio wave analysis by computer.But there are defectives such as error of omission in the magnetic recording of HOiTER monitor.Because tape quantity to be checked is big, false retrieval takes place easily simultaneously.The record performance of this machine belongs to the property related, and can not directly point out immediately and diagnose for the custodial person.

Wearing type intelligent cardiac monitoring and recording instrument is monitored the anomalous ecg due to the electrocardio disorder, has heart rate and shows continuously, reports to the police automatically.Functions such as memory and record.This machine is that each rhythm and pace of moving things with cardiac electrical activity is converted into the per minute is the relative heart rate numerical value of unit.Directly, whether even with the speed of heart rate, do instantaneous continuous demonstration with liquid crystal digital.Can and cross again that to delay in 40～200 times/minute scopes with ten be that radix carries out bound and presets (not needing units) instant alarming transfinites to tachycardias.

The characteristics of incidence of cardiovascular disease is at random, does not promptly have fixed rule.In the clinical practice, to the uneven electrocardio data of dynamic centering rule, also different non-being easy to get.And this instrument possesses the automatic warning of arrhythmia (R-R does not wait 〉=0.12 second) at any time of any reason and the function of memory heart rate numerical value this moment.

The ECG tape recorder of this instrument is made up of manipulator and external recorder.Can at any time electrocardiosignal be noted as required.Use and the supporting demodulator of this instrument, connect electrocardiograph or electrocardioscope and finish the tape playback, can the property related analysis and diagnosis.

Below in conjunction with the circuit schematic flow sheet, wearing type intelligent cardiac monitoring and recording instrument is described in further detail.

Fig. 1 is this utility model wearing type intelligent cardiac monitoring and recording instrument structure schematic flow sheet.According to this figure, do following detailed description:

Electrocardiosignal is taken to monitored person's chest, after picking up by two electrodes, sends into the input stage (1) of this machine, and this grade mainly finished the impedance transformation of signal.In addition, the calibration signal of 1MV is produced by this level.

Electrocardio amplifier stage (2) be common mode rejection ratio=60d Ъ amplifier (if improve common mode rejection ratio, only guaranteed this level is complementary elements mismatch degree=2% mainly, then common mode rejection ratio can reach 80d Ъ).It amplifies 1000 times with millivolt level electrocardiosignal.Signal after the amplification is transported to manipulator (3) and frequency-selective amplifier (5) respectively.When carrying out the electrocardio magnetic recording as need, connect the manipulator on and off switch, can export modulated electrocardiosignal by emitter follower (4), this manipulator adopts the VCO mode that electrocardiosignal is modulated, and the electrocardiosignal after the modulation is exported by emitter follower.The unlatching of manipulator is controlled by on and off switch.

Frequency-selective amplifier (5) is an alternative current amplifier.It takes electric capacity to come coupling (in conjunction with the accompanying drawings 2), amplifies (calculating of heart rate is that the width with the R-R ripple is the basis of calculation) behind the HFS differential with the R ripple of electrocardiosignal.Two benefits have been done like this: 1. do not imported the polar restriction of electrocardio; 2. be not subjected to because the interference that wearer's movable caused electrocardio baseline changes.Schmidt trigger (6) is that frequency-selective amplifier (5) output signal is shaped as a square wave, triggers monostable (7) with its rising edge, and generation is the square wave of 100mS with the synchronous width of signal of telecommunication R ripple.The trailing edge of this square wave triggers the square wave that monostable (8) produce the 10mS width.Like this, each ecg-r wave occurs, and monostable (7), (8) are just successively exported one wide one narrow square wave successively.Coordinate under the control at this two square wave, to number generator (10), linear generator (18) produces the voltage that is proportional to electrocardio R-R wave width respectively.Simultaneously monostable (7), control sampling keep level (11), (19) synchronous working, the voltage amplitude that generator is separately the produced maintenance of taking a sample.The R wave impulse whenever once, said process promptly repeats once.The every repetition once just keeps new R-R width get off with the voltage amplitude form, supplies with A/D converter (12) and allotter (20).

Here it may be noted that, to number generator, produce and press the voltage of logarithm growth, is in order to revise heart rate and the index error of time, to obtain instantaneous heart rate with this kind method and show that its precision meets clinical needs.And possesses little power consumption, reliability height, the advantage that need not to debug.Voltage after sampling keeps is delivered to A/D converter conversion.A/D converter is to change with the sampling of self, and demonstrates the magnitude of voltage that keeps (11) to send here by sampling with liquid crystal digital (13).Actual proof, instantaneous heart rate error≤3% that adopts this kind method to obtain.

Decoder (14) is that tens that heart rate is shown and hundred figure places are carried out stroke BCD decoding (units need not).BCD dial (15) carries out tachycardias or slow excessively presetting, and in 40～200 times/minute scopes of the upper limit, all can set arbitrarily, and lower limit can be done presetting of 40～90 several.When transfiniting by alarm (16) with acoustic alarm.

ARR detection keeps (19) to provide by sampling and is proportional to R-R wave width linear voltage.Under monostable (7) pulse control, in turn this voltage is offered two inputs of arithmetical unit (21) by allotter (20), compare computing.When R-R did not wait 〉=0.12 second, arithmetical unit, (21) output voltage was executed special trigger (23) with triggering.Output is divided into two-way through switch (24), and one the tunnel to go monostable (25) be 4 seconds with pulse-spreading, comes coupling device (26) to alarm (16) sounding alarm through photoelectricity simultaneously.Memory retentive control (27) is triggered on another road, makes its output change over electronegative potential by original high potential, has just closed the input of monostable (7) thus, and electrocardiosignal is blocked.The voltage by number generator is produced of last R-R wave width control is kept by sample-and-hold circuit (11).Because the voltage of this moment has been a fixed value,, the A/D converter numeral also just is fixed up so showing.

It is set for restarting instrument work to recover knob (28).After pressing this and turning round, being output as 4 seconds width is square wave, will remember maintenance (27) output and be changed to high potential again, and monostable (7) is reopened.Each several part is being started working again under the R pulse control after the shaping, the setting of gauge tap (22), be in order to block in moment of start since arithmetical units (21) two the input inherent voltage with just to the pulse that occurred of comparative voltage competition back, the blocking-up time is 4 seconds, this time is normal to guarantee complete machine work recovery, and switch (24) is a manual switch, and its setting is because some patient does not need the detection of this project, cut-off switch (24) like this, this of instrument performance has just been removed.

In order to guarantee the stable performance of complete machine when battery will exhaust and accurate, the spy is provided with reference power supply (9).When this reference power supply is reduced to 7V at 9V voltage, can guarantee that still it is constant, use for generator (10), (18) Schmidt trigger (6), (23).Thereby guarantee the concordance of the every performance of instrument when new used batteries.

The power supply of instrument has used two stacking batteries of 9V, supplies with A/D converter (12), decoder (14), BCD dial (15), alarm (16) for one.Another piece is supplied with remainder.Its problem easy to use and the complete machine cost is mainly considered in power supply by this way.

With the matching used demodulator of this instrument, be as the electrocardiosignal of playback on tape, can connect the electrocardiograph or the electrocardioscope of any model, the ecg wave form after the playback is undistorted, and can adjust the amplitude of electrocardiosignal.

Amplifying (1), schmidt trigger detection (2) demodulation (3) and emitter following (4) by input respectively according to figure (3) demodulator is formed.

The demodulator stacking battery powered of 9V.Power consumption 30mW.

The performance of relevant this instrument, index, please see attached list.

Claims (4)

1, the intellectual monitoring of wearing type intelligent cardiac monitoring and recording instrument, by instantaneous heart rate demonstration, tachycardias and slow excessively bound preset, overload alarm and arrhythmia detect automatically, report to the police, memory and restoring circuit are formed, its technical characterictic is:

A, instantaneous heart rate show, adopt number generator (10) as signal source.

B, tachycardias, slow excessively bound preset, and are made up of stroke/BCD decoding (14) BCD driver chuck (15).

C, ARRly detect automatically, adopt linear generator (18) as signal source.

2, according to the described wearing type intelligent cardiac of claim 1 monitoring and recording instrument, it is characterized in that: the instantaneous continuous display circuit of heart rate is by monostable (7), (8), a reference source (9), sampling keeps (11) A/D conversion (12) to be formed to number generator (10).

3, according to the described wearing type intelligent cardiac of claim 1 monitoring and recording instrument, it is characterized in that: tachycardia, the slow excessively warning circuit that reaches are made up of A/D conversion (12), decoder (14), BCD dial (15) and alarm (16).

4, according to the described wearing type intelligent cardiac of claim 1 monitoring and recording instrument, it is characterized in that: arrhythmia R-R does not wait 〉=0.12 second, and report to the police automatically memory and restoring circuit keep (19), allotter (20), arithmetical unit (21), gauge tap (22), Schmidt trigger (23), switch (24), monostable (25), photoelectrical coupler (26), alarm (16), memory to keep (27) by monostable (7), (8), a reference source (9), linear generator (18), sampling and recover (28) and form.

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