CN1033152A - Potential detecting system for sino-atrial nodes in body surface - Google Patents
Potential detecting system for sino-atrial nodes in body surface Download PDFInfo
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- CN1033152A CN1033152A CN 87105933 CN87105933A CN1033152A CN 1033152 A CN1033152 A CN 1033152A CN 87105933 CN87105933 CN 87105933 CN 87105933 A CN87105933 A CN 87105933A CN 1033152 A CN1033152 A CN 1033152A
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Abstract
Potential detecting system for sino-atrial nodes in body surface is a kind of being used in the chambers of the heart, esophagus interior and sino-atrial nodes in body surface current potential and the later various detection systems that change electrocardiosignal (as the U ripple) slowly of T ripple.The duration of its amplifier is by microcomputer automatic control, and in a cardiac cycle, the duration of amplifier automatically operates in two kinds of different numerical value, thereby has removed the artifact that base amplifier forms after the T ripple under high-gain.Through zoopery, the normal person detects, the clinical case checking, has obtained Expected Results.
Description
What the present invention will propose is a kind of can be used in the chambers of the heart, the various detection systems that change electrocardiosignal (as the U ripple) slowly in the esophagus and behind sino-atrial nodes in body surface current potential and the T ripple.
Sinuatrial node (being called for short SN) dysfunction is common heart disease, it is one of major reason of this syndrome generation of Ah one and sudden death, because of limited by record condition, evaluation to the SN function at present mainly depends on Electrocardiographic rational analysis and the indirect determination of premature beat stimulus method, and certain limitation and error are arranged.The intracavity that development in recent years is got up (wound is arranged), esophagus and body surface (no wound) SN electrograph is in order to understand and to estimate that the SN function provides new more efficiently method but owing to adopt conventional amplifier record, so the SN current potential is subject to the influence of T waveform attitude, thereby the correct identification of SN current potential is brought difficulty.
The purpose that the present invention proposes is the problem at above-mentioned existence, and the two duration high-precision amplifyings of application program control are eliminated the influence of T ripple to record SN current potential, have finished the development of potential detecting system for sino-atrial nodes.
The design philosophy and the technical solution of the present invention's development.
Base amplifier can form artifact because of closing discharging and recharging of electric capacity, thereby influence the correct identification of sinus node potential under high-gain after electrocardiosignal T ripple, bring false positive or false negative to clinical diagnosis.
The generation of artifact is relevant with the amplifier duration, and duration is more little, artifact obvious more (but time-histories is short more), and excessive duration can cause the problems such as drift of baseline.The duration of the two duration amplifiers of programme-control is controlled by CPU.CPU is operated in the multi-channel data acquisition state, and the first via is gathered conventional electrocardiosignal, and the second the tunnel gathers the SN signal of telecommunication, after CPU collects R ripple in the electrocardiosignal, output order changes the amplifier duration through delaying time just, and is maintained to the end of T ripple, and then makes duration recover original numerical value.In a cardiac cycle, the amplifier duration automatically operates in two kinds of different numerical value like this, to eliminate the T ripple to the influence of record SN current potential and keep the stable of baseline.
The program control pair of duration divides two kinds of the two durations of capacitor type and the two durations of resistor-type.The two durations of capacitor type are by on-off circuit GK, capacitor C ' and C form (C '＜＜C), wherein GK connects with C ' parallel connection and with C; The two durations of resistor-type are by on-off circuit GK, resistance R and input resistance Ri form (R '＜＜Ri), wherein GK connects with R ', and is and in parallel with Ri.Said switching circuit GK can also be constituted and can be made of mechanical organ by electronic component.
The two duration operation principles of capacitor type be (seeing figure): under normal conditions, D/A produces-the 5V storage battery, and this moment, the G1 pipe was led, and G2 grid potential pact-1V is high resistant because of instead dying partially over the ground to the prime outfan, and source, drain electrode still are in conducting state, so the C short circuit.Amplifier interstage coupling duration τ=RC, when the T ripple comes then (by programme-control) D/A output+5V, G1 ends, and the G2 grid voltage is high resistant.And C ' connects with C, and in parallel with the G2 pipe.Because C '＜＜C, thus can not fill with than multi-charge on the coupling capacitance C because of the T ripple, thus the discharge potential difference when having avoided the end of T ripple.And after the end of T ripple, the discharge of C ' can not had artifact through one-level 1M resistance R event later by the short circuit of G2 conducting institute.
The two duration high-precision amplifying operation principles of resistor-type are: under normal conditions, D/A output+5V level, this moment, the G1 pipe ended, and G2 pipe source, drain electrode are high-impedance state by pinch off, so R ' is inoperative, amplifier interstage coupling duration τ=RC.When the T ripple closes to an end, make D/A output-5V level (only keeping very short time) by programme-control, G1 pipe conducting this moment, G2 manages also conducting, because R '＜＜Ri, so the artifact that the T ripple was produced when finishing is by the very fast short circuit of R ', to the not influence of SN current potential of next cardiac cycle.Microcomputer has also been undertaken the multichannel ecg signal acquiring, the demonstration of sinus node potential figure and the measurement of parameter except that being responsible for the two duration high-precision amplifyings of control.The work process of the two durations of microcomputer controlled electro appearance type is as follows: CPU is when multi-channel data acquisition, unfavorablely disconnected declare whether adopt the R ripple, when the R ripple arrives, CPU (is equivalent to the T ripple) after certain time-delay, just make D/A output+5V level, and be maintained to the end of T ripple, and make D/A output-5V level again, thus the switching of the two durations of control automatically.
The present invention can be used in the chambers of the heart fully, with body surface record sinus node potential, understands antrum conduction situation in the esophagus, estimates sinus node function, for clinical slow arrhythmia provides diagnosis basis, determines whether to implant a pacemaker.
Also can be used for detecting the electrocardiosignal T ripple various current potentials (as the U ripple) that change slowly afterwards, use for experimentation and clinical diagnosis.
Accompanying drawing 1 is the potential detecting system for sino-atrial nodes in body surface block diagram.
Accompanying drawing 2 is condenser type duration control sequence flow charts.
Accompanying drawing 3 is the two duration high-precision amplifying layouts of programme-control.
In the accompanying drawing 1,21 is conventional heart figure amplifier, the 2nd, programme-control duration amplifier, the 3rd, sampling, the 4th, D/A output+5V, the 5th behind time-delay 0.1S, D/A output-5V after the T ripple finishes.
G1 in the accompanying drawing 3, G2 are respectively crystal triodes.GK is an on-off circuit, and it can be made up of transistor or mechanical part.C is the electric capacity that is connected in parallel on the on-off circuit GK, and C is that electric capacity, 6 is 50 all I wave traps, the 7th frequently, tetravalence low pass filter, the 8th, A/D converter, the 9th, conventional leads electrocardiosignal, the 10th, the sinuatrial node signal of telecommunication.
Claims (1)
- A kind of potential detecting system for sino-atrial nodes in body surface of forming by microcomputer, A/D, D/A converter and amplifier, it is characterized in that amplifier adopts the two duration high-precision amplifyings of programme-control, duration is by programme-control, variable, time value part at amplifier has an on-off circuit GK, it and capacitor C ' in parallel, and connect with capacitor C, C '＜＜C.Perhaps with a resistance R ' connect with on-off circuit GK, and in parallel with resistance R i, R '＜＜Ri.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87105933 CN1033152A (en) | 1987-11-18 | 1987-11-18 | Potential detecting system for sino-atrial nodes in body surface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87105933 CN1033152A (en) | 1987-11-18 | 1987-11-18 | Potential detecting system for sino-atrial nodes in body surface |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1033152A true CN1033152A (en) | 1989-05-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 87105933 Pending CN1033152A (en) | 1987-11-18 | 1987-11-18 | Potential detecting system for sino-atrial nodes in body surface |
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| Country | Link |
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| CN (1) | CN1033152A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103431858A (en) * | 2013-09-09 | 2013-12-11 | 重庆电子工程职业学院 | Sinus node electrogram obtaining method and sinus node electrogram obtaining system based on distributed electrodes |
-
1987
- 1987-11-18 CN CN 87105933 patent/CN1033152A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103431858A (en) * | 2013-09-09 | 2013-12-11 | 重庆电子工程职业学院 | Sinus node electrogram obtaining method and sinus node electrogram obtaining system based on distributed electrodes |
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