CN105877740A - Rapid resetting method for electrocardiogram waveform baseline - Google Patents
Rapid resetting method for electrocardiogram waveform baseline Download PDFInfo
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- CN105877740A CN105877740A CN201610225113.0A CN201610225113A CN105877740A CN 105877740 A CN105877740 A CN 105877740A CN 201610225113 A CN201610225113 A CN 201610225113A CN 105877740 A CN105877740 A CN 105877740A
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- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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- A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
- A61B5/316—Modalities, i.e. specific diagnostic methods
- A61B5/318—Heart-related electrical modalities, e.g. electrocardiography [ECG]
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Abstract
The invention provides a rapid resetting method for an electrocardiogram waveform baseline, which is applied to an electrocardiogram machine. The rapid resetting method is characterized by comprising the following steps: setting an RC high-pass circuit on each acquisition channel of an electrocardiogram signal, wherein the RC high-pass circuit comprises a resistor R1 and a capacitor C1, the capacitor C1 is provided with a first end connected with a front-grade circuit and a second end connected with a rear-grade circuit, the resistor R1 is connected between the second end and a ground end of the capacitor C1, a resistor R0 is arranged beside the resistor R1, the resistance value of the resistor R0 is smaller than that of the resistor R1, one end of the resistor R0 is connected with the second end of the capacitor C1, and the other end of the resistor R0 is connected with one channel pin of a multiplexer; when finding that the electrocardiogram waveform baseline is deviated and exceeds a pre-set threshold value, setting a control pin of the multiplexer as a high electric level by a processor, and enabling the resistor R0 to be grounded, thus rapidly discharging the capacitor C1 and rapidly resetting the electrocardiogram waveform baseline; after finding that the electrocardiogram waveform baseline is reset, setting the control pin of the multiplexer as a low electric level by the processor, and enabling the resistor R0 to be suspended.
Description
Technical field
The present invention relates to a kind of ecg wave form baseline Rapid reset method.
Background technology
Electrocardiograph is the physiological function detecting instrument of record heart biology electrical activity waveform (i.e. electrocardiogram), the essential information that various heart disease is made a definite diagnosis and treated can be provided, contribute to analyzing and recognizing all kinds of arrhythmia, diagnose multiple cardiovascular disease, helping understanding some drugs and electrolyte disturbance and acid base imbalance on pathology such as myocardium impacts, therefore electrocardiograph has consequence in heart disease inspection.During the use of electrocardiograph, the quickly output of patient's electrocardio report is extremely important, especially when large-scale health check-up, what electrocardio was reported quickly output can save patient's electrocardiographic examination time, improve and check efficiency, reduce the labor intensity of medical worker, reduce patient's waiting time.The quick output of patient's electrocardio report, it is necessary first to the quick output of patient's ecg wave form, and the Rapid reset of patient's ecg wave form baseline and stability are crucial.
In electrocardiogram acquisition circuit, in order to overcome polarizing voltage, the bias voltage of preposition amplifier, RC high pass circuit can generally be configured with on each acquisition channel, see accompanying drawing 1.Electric capacity and the resistance of resistance low frequency it is provided with in RC high pass circuit.Due to the requirement of electrocardiosignal low frequency characteristic, time constant should be not less than 3.2s (seeing industry standard YY1139-2013), so electric capacity C value is generally general value 3.9M of 1uF, resistance R.When electric capacity C has charging, the quiescent direct current voltage of electric capacity is added in electrocardiosignal, and the ecg wave form baseline of pickup drifts about, because resistance R value is relatively big, electric capacity electric discharge is slowly so that ecg wave form baseline is difficult to Rapid reset to baseline.
In order to reach the purpose of ecg wave form baseline Rapid reset, existing electrocardiograph typically uses the method for software filtering to have: one, by opening software low frequency filtering, improves high-pass filtering frequency so that ecg wave form baseline Rapid reset；Two, by opening software ac filter (the part ac filter algorithm function containing high pass) so that ecg wave form baseline Rapid reset.Some defects and deficiency is there is above by the method opening software filtering and realizing ecg wave form baseline Rapid reset:
(1) open software low-pass filtering or ac filter, it is achieved ecg wave form Rapid reset, also filtered off the cardiac electrical low-frequency component of patient simultaneously, patient's ecg wave form distortion can have been caused, affect the diagnosis of doctor.
(2) still having charging due to electric capacity, the DC voltage that electric capacity produces is superimposed upon in ecg wave form, and rear class amplifying circuit may be made to be operated in volume edges or go beyond the scope.
(3) by opening software filtering, it is achieved ecg wave form Rapid reset, in order to avoid ecg wave form excessive distortion, ecg wave form resets the quickest.
(4) by opening software filtering, it is achieved ecg wave form Rapid reset, it is impossible to meet electrocardiograph industry standard YY1139-2013 requires (when product carries out low frequency characteristic detection, software filtering typically preserves closed mode) to low frequency characteristic.
Summary of the invention
For overcoming the prior art mentioned by background technology not enough, it is achieved the Rapid reset of ecg wave form baseline, the present invention proposes a kind of ecg wave form baseline Rapid reset method, and its concrete technology contents is as follows:
The preferred version one of the present invention:
A kind of ecg wave form baseline Rapid reset method, is applied on electrocardiograph, it is characterised in that:
Each acquisition channel of electrocardiosignal is respectively equipped with RC high pass circuit, this RC high pass circuit includes resistance R1 and electric capacity C1, this electric capacity C1 has the first end connecting front stage circuits and the second end connecting late-class circuit, this resistance R1 is connected between second end of this electric capacity C1 and ground end, side at resistance R1 is provided with resistance R0, the resistance of this resistance R0 is less than resistance R1, its one end connects second end of this electric capacity C1, its other end connects on a passage pin of MUX, this MUX according to control pin the signal of telecommunication to each passage perform ground connection unsettled operation；
The processor of electrocardiograph connects this MUX, and it gathers each passage EGC waveform data and carries out real time contrast's monitoring；
When finding ecg wave form baseline deviation beyond pre-set threshold value, processor is set to high level to by the control pin of this MUX so that resistance R0 ground connection, and total RC time constant declines, and electric capacity C1 is able to repid discharge, makes ecg wave form baseline Rapid reset；
After finding that ecg wave form baseline resets, processor is set to low level to the control pin of MUX immediately so that resistance R0 is unsettled.
In the middle of one or more embodiments of the invention, the capacitance of this electric capacity is 1 microfarad, and the resistance of this resistance R is 3.9M ohm, and the resistance of this resistance R0 is 3.9K ohm.
The preferred version two of the present invention:
A kind of ecg wave form baseline Rapid reset method, is applied on electrocardiograph, it is characterised in that:
Each acquisition channel of electrocardiosignal is respectively equipped with RC high pass circuit, this RC high pass circuit includes resistance R1 and electric capacity C1, this electric capacity C1 has the first end connecting front stage circuits and the second end connecting late-class circuit, this resistance R1 is connected between second end of this electric capacity C1 and ground end, side at resistance R1 is provided with little valued resistor R0, the resistance of this resistance R0 is less than resistance R1, its one end connects second end of this electric capacity C1, its other end connects on a passage pin of MUX, MUX according to control pin the signal of telecommunication to each passage perform ground connection unsettled operation；
The processor of electrocardiograph connects this MUX, and is provided with a reset key supplying user operation；
When the user discover that ecg wave form baseline deviation is bigger, persistently pressing reset key, the processor of electrocardiograph responds and the control pin of this MUX is set to high level, make resistance R0 ground connection, total RC time constant declines, and electric capacity C1 is able to repid discharge, makes ecg wave form baseline Rapid reset；
After the user discover that ecg wave form baseline completes to reset, unclamping reset key, processor is set to low level to the control pin of MUX immediately so that resistance R0 is unsettled.
In the middle of one or more embodiments of the invention, the capacitance of this electric capacity is 1 microfarad, and the resistance of this resistance R is 3.9M ohm, and the resistance of this resistance R0 is 3.9K ohm.
This discovery is compared with prior art, its advantageous exists: importance based on patient's ecg wave form baseline Rapid reset, the deficiency that ecg wave form baseline resets is realized for software mode, monitored in real time by ecg wave form baseline, the technical methods such as software is automatically or manually controlled, multi-path choice, double hardware high pass frequency filterings realize baseline Rapid reset.On electrocardiograph, when carrying out the pickup of patient's ecg wave form, ecg wave form baseline deviation detected, controlled by software immediately, improve hardware high pass frequency filtering, make baseline Rapid reset, Fast Restoration hardware high pass frequency filtering after reset, allows machine enter recordable state, in the case of ensureing patient's ecg wave form primitiveness, realize patient's ecg wave form baseline Rapid reset, thus quick obtaining patient's electrocardio is reported.
Accompanying drawing explanation
Fig. 1 is the RC high pass circuit structure chart in the middle of prior art on each electrocardiogram acquisition passage.
Fig. 2 be the present invention placed R1 resistance and MUX RC high pass circuit structure chart.
Detailed description of the invention
Below in conjunction with accompanying drawing, the application scheme is further described:
See accompanying drawing 2, embodiments of the invention one:
A kind of ecg wave form baseline Rapid reset method, it is applied on electrocardiograph, each acquisition channel of electrocardiosignal is respectively equipped with RC high pass circuit, this RC high pass circuit includes resistance R1 and electric capacity C1, this electric capacity C1 has the first end connecting front stage circuits and the second end connecting late-class circuit, this resistance R1 is connected between second end of this electric capacity C1 and ground end, side at resistance R1 is provided with resistance R0, the resistance of this resistance R0 is less than resistance R1, its one end connects second end of this electric capacity C1, its other end connects on a passage pin of MUX, this MUX according to control pin the signal of telecommunication to each passage perform ground connection unsettled operation；The capacitance of this electric capacity is 1 microfarad, and the resistance of this resistance R is 3.9M ohm, and the resistance of this resistance R0 is 3.9K ohm.
As a example by triple channel electrocardiograph, the resistance R0 of each acquisition channel is connected respectively to X1, Y1 and Z1 foot of MUX CD4053, X, Y, Z foot ground connection of this MUX CD4053, foot A, B, C foot that controls of MUX CD4053 is connected to the GPIO foot of processor, processor control MUX CD4053.
Connecting patient's each cardiac diagnosis lead electrode, processor gathers each passage EGC waveform data and carries out real time contrast's monitoring；When finding that ecg wave form baseline deviation is beyond pre-set threshold value (such as, more than 0.5mV) time, processor is set to high level to by control pin A, B, C foot of this MUX CD4053, make the resistance R0 ground connection of each acquisition channel, total RC time constant declines (T about 0.4 second), electric capacity C1 is able to repid discharge, makes ecg wave form baseline Rapid reset (resetting time is less than 2 seconds)；After finding that ecg wave form baseline resets, processor is set to low level to control pin A, B, C foot of MUX immediately so that resistance R0 is unsettled, and total RC time constant is recovered to conventional value.
Especially, when carrying out ecg wave form baseline and resetting, processor suspends the record of ecg wave form；After reset operation completes, processor recovers ecg wave form recording status again, and user presses writing function button and starts ecg wave form record, output patient's electrocardio report.
Embodiments of the invention two:
It is with the difference of above-described embodiment one, and ecg wave form baseline resets and controls by user's manual operation, and the processor of electrocardiograph connects this MUX CD4053, and is provided with a reset key supplying user operation；When the user discover that ecg wave form baseline deviation is bigger, persistently pressing reset key, the processor of electrocardiograph responds and the control pin of this MUX is set to high level, make resistance R0 ground connection, total RC time constant declines, and electric capacity C1 is able to repid discharge, makes ecg wave form baseline Rapid reset；After the user discover that ecg wave form baseline completes to reset, unclamping reset key, processor is set to low level to the control pin of MUX immediately so that resistance R0 is unsettled.
By the method for the present invention, can realize ecg wave form baseline Rapid reset, resetting time is less than 2s.Owing to Rapid reset occurred before electrocardiographic recording, during electrocardiographic recording, time constant has recovered normal, so ecg wave form distortion will not be caused, it is ensured that the primitiveness of electrocardiosignal.The most just owing to when ecg wave form record, baseline has resetted, rear class amplifying circuit will not be caused to be operated in volume edges or go beyond the scope so that amplifying circuit is operated in optimum range, advantageously ensure that integrity and the verity of electrocardiosignal.
Above-mentioned preferred implementation should be regarded as the illustration of the application scheme embodiment, and all, approximations identical with the application scheme or the technology made based on this are deduced, replaced, improvement etc., are regarded as the protection domain of this patent.
Claims (4)
1. an ecg wave form baseline Rapid reset method, is applied on electrocardiograph, it is characterised in that:
Each acquisition channel of electrocardiosignal is respectively equipped with RC high pass circuit, this RC high pass circuit includes resistance R1 and electric capacity C1, this electric capacity C1 has the first end connecting front stage circuits and the second end connecting late-class circuit, this resistance R1 is connected between second end of this electric capacity C1 and ground end, side at resistance R1 is provided with resistance R0, the resistance of this resistance R0 is less than resistance R1, its one end connects second end of this electric capacity C1, its other end connects on a passage pin of MUX, this MUX according to control pin the signal of telecommunication to each passage perform ground connection unsettled operation；
The processor of electrocardiograph connects this MUX, and it gathers each passage EGC waveform data and carries out real time contrast's monitoring；
When finding ecg wave form baseline deviation beyond pre-set threshold value, processor is set to high level to by the control pin of this MUX so that resistance R0 ground connection, and total RC time constant declines, and electric capacity C1 is able to repid discharge, makes ecg wave form baseline Rapid reset；
After finding that ecg wave form baseline resets, processor is set to low level to the control pin of MUX immediately so that resistance R0 is unsettled.
Ecg wave form baseline Rapid reset method the most according to claim 1, it is characterised in that: the capacitance of this electric capacity is 1 microfarad, and the resistance of this resistance R is 3.9M ohm, and the resistance of this resistance R0 is 3.9K ohm.
3. an ecg wave form baseline Rapid reset method, is applied on electrocardiograph, it is characterised in that:
Each acquisition channel of electrocardiosignal is respectively equipped with RC high pass circuit, this RC high pass circuit includes resistance R1 and electric capacity C1, this electric capacity C1 has the first end connecting front stage circuits and the second end connecting late-class circuit, this resistance R1 is connected between second end of this electric capacity C1 and ground end, side at resistance R1 is provided with little valued resistor R0, the resistance of this resistance R0 is less than resistance R1, its one end connects second end of this electric capacity C1, its other end connects on a passage pin of MUX, MUX according to control pin the signal of telecommunication to each passage perform ground connection unsettled operation；
The processor of electrocardiograph connects this MUX, and is provided with a reset key supplying user operation；
When the user discover that ecg wave form baseline deviation is bigger, persistently pressing reset key, the processor of electrocardiograph responds and the control pin of this MUX is set to high level, make resistance R0 ground connection, total RC time constant declines, and electric capacity C1 is able to repid discharge, makes ecg wave form baseline Rapid reset；
After the user discover that ecg wave form baseline completes to reset, unclamping reset key, processor is set to low level to the control pin of MUX immediately so that resistance R0 is unsettled.
Ecg wave form baseline Rapid reset method the most according to claim 3, it is characterised in that: the capacitance of this electric capacity is 1 microfarad, and the resistance of this resistance R is 3.9M ohm, and the resistance of this resistance R0 is 3.9K ohm.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2394572Y (en) * | 1999-09-22 | 2000-09-06 | 珠海经济特区中立电子工程有限公司 | Standard 12 conductive lead electrocardiosignal collector matched with portable electrocardiogram monitor |
| CN1596825A (en) * | 2004-07-26 | 2005-03-23 | 深圳迈瑞生物医疗电子股份有限公司 | Method and circuit for measuring of inhibiting electrocardiac waveforms by suppressing pace make pulse |
| US20060047210A1 (en) * | 2004-08-27 | 2006-03-02 | Omron Healthcare Co., Ltd. | Portable electrocardiograph and processing method |
| CN201542630U (en) * | 2009-11-13 | 2010-08-11 | 青岛盘古电气有限公司 | Novel electrocardio-recorder |
| WO2015068106A1 (en) * | 2013-11-08 | 2015-05-14 | Koninklijke Philips N.V. | Ecg high pass filter |
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2016
- 2016-04-12 CN CN201610225113.0A patent/CN105877740B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2394572Y (en) * | 1999-09-22 | 2000-09-06 | 珠海经济特区中立电子工程有限公司 | Standard 12 conductive lead electrocardiosignal collector matched with portable electrocardiogram monitor |
| CN1596825A (en) * | 2004-07-26 | 2005-03-23 | 深圳迈瑞生物医疗电子股份有限公司 | Method and circuit for measuring of inhibiting electrocardiac waveforms by suppressing pace make pulse |
| US20060047210A1 (en) * | 2004-08-27 | 2006-03-02 | Omron Healthcare Co., Ltd. | Portable electrocardiograph and processing method |
| CN201542630U (en) * | 2009-11-13 | 2010-08-11 | 青岛盘古电气有限公司 | Novel electrocardio-recorder |
| WO2015068106A1 (en) * | 2013-11-08 | 2015-05-14 | Koninklijke Philips N.V. | Ecg high pass filter |
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