CN105105744A - Electrocardiosignal collector - Google Patents
Electrocardiosignal collector Download PDFInfo
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- CN105105744A CN105105744A CN201510583598.6A CN201510583598A CN105105744A CN 105105744 A CN105105744 A CN 105105744A CN 201510583598 A CN201510583598 A CN 201510583598A CN 105105744 A CN105105744 A CN 105105744A
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- circuit
- preamplifier
- electrocardiosignal
- pass filter
- amplifier
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Abstract
The invention discloses an electrocardiosignal collector. The electrocardiosignal collector comprises a pre-amplifier, a high-pass filtering circuit, a 50 Hz wave trap, a main amplifier and a low-pass filter, all of which are sequentially connected. A feedback circuit is further connected to the pre-amplifier. An electrocardiosignal input terminal is connected between the feedback circuit and the pre-amplifier. A level offset circuit and an amplification factor conditioning circuit are sequentially connected behind the low-pass filter. Based on the principle, power frequency interference signals generated by the human body can be processed on multiple aspects, various kinds of noise can be filtered out, the structure is simple, the interference of power frequency signals can be reduced to the maximum degree, more accurate electrocardiosignals can be obtained, and the judgment on the illness condition of the human body in the later period is more accurate.
Description
Technical field
The present invention relates to medical Intensive Care Therapy field, be specifically related to Electrocardial signal acquisition device.
Background technology
Since the custodial care facility of the simple function had from 20 century 70s comes out, it just progressively obtains the extensive use of clinical monitoring.But the custodial care facility of simple function is due to the limitation of its monitoring function, far can not meet the needs of clinical practice, seriously constrain the rescue of hospital to numerous critical patients.Enter the nineties, along with the development of sensing technology and electronic technology, monitored parameters is on the increase, and is guarded develop into multi-parameter monitoring by the single parameter in past.Such as guarded by single cardiac monitoring, blood pressure monitoring, blood oxygen saturation, progressively develop into the multi-parameter monitor comprising electrocardio, breathing, blood pressure, blood oxygen saturation, body temperature, End-tidal carbon dioxide, cardiac output and anesthetic gases analysis etc., these equipment just play positive effect in the diagnosis of hospital clinical.In existing ecg signal acquiring process, acquired signal is easily subject to the impact of the power frequency interference signals that human body produces, or it is undesirable to get rid of power frequency interference signals, causes finally recording electrocardiosignal inaccurate, affects the accurate judgement of later stage to the state of an illness.
Summary of the invention
Instant invention overcomes the deficiencies in the prior art, Electrocardial signal acquisition device is provided, this terminal can carry out many-sided process to the power frequency interference signals that human body produces, the various noise of filtering, structure is simple, the interference of maximized reduction power frequency component, can obtain electrocardiosignal more accurately, and it is more accurate to judge the state of an illness in human body later stage.
For solving above-mentioned technical problem, the present invention is by the following technical solutions: Electrocardial signal acquisition device, comprise the preamplifier, high-pass filtering circuit, 50Hz wave trap, main amplifier and the low pass filter that connect successively, preamplifier also connects feedback circuit, between feedback circuit and preamplifier, connect electrocardio input terminal, also connect level shift circuit and amplification modulate circuit successively at the rear of low pass filter.Need the amplification of the electrocardiosignal at measurement electrode two ends through preamplifier in the gatherer process of electrocardiosignal, then allow detected signal by high pass circuit filtering baseline drift, at this moment the electrocardiosignal amplitude detected is very little, and be mixed into a large amount of 50Hz interfering signals, then needed to filter out power frequency interference signals by 50Hz wave trap.Then need again the electrocardiosignal after process to be amplified, and then through the filter action of low pass filter, the interference of filtering various high-frequency noise, most relief electrocardiosignal just can obtain electrocardiosignal accurately by level shift circuit and amplification modulate circuit.In order to the signal seedbed end provided at feedback end and the electrocardio input terminal of preamplifier sets up Commom-mode feedback, this negative feedback utilizes feedback circuit to realize, to improve the depth of feedback of circuit, still adopt preamplifier to access the signal source reference edge of electrocardio input terminal generation after feedback signal being amplified, Hz noise can be offset to greatest extent like this.In addition, in the gatherer process of electrocardiosignal, there is the common-mode signal interference of 50Hz in human body, because the common mode rejection ratio of preamplifier neither be infinitely great, the difference of the contact resistance at measurement electrode two ends, and shielding line can not effectively shield space 50Hz interfering signal completely, these many situations finally cause the input of power frequency 50Hz interfering signal at instrument amplifier AD620 to the conversion of difference mode signal, so need filtering 50Hz Hz noise, and the setting of 50Hz wave trap further effectively can suppress this power frequency interference signals, thus improve the last accuracy exporting electrocardiosignal further.
Described high-pass filtering circuit comprises electric capacity C and resistance R, and electric capacity C two ends connect preamplifier and 50Hz wave trap respectively, also connects pull down resistor R at the outfan of electric capacity C.This high-pass filtering circuit structure is simple, can also play a multiplier effect to partition DC channel and elimination baseline drift, the interference of a filtering part.
The model of described main amplifier is OP07, and the amplification of main amplifier is between 140-150.This main amplifier is mainly used in improving gain.
The model of described preamplifier is AD620.This amplifier has higher common mode rejection ratio (CMRR), and temperature stability is good, and amplification band is wide, and noise coefficient is little and have feature easy to adjust, is the ideal chose that biomedicine signals amplifies.According to the design principle of small signal amplifier, the gain of preamplifier can not arrange too high, because pregain is too high will be unfavorable for the process of subsequent conditioning circuit to noise.
Described low pass filter is the low pass filter of 100Hz.Frequency range due to electrocardiosignal is general all at 0-100Hz, so need the low pass circuit of electrocardiosignal by 100Hz.
Compared with prior art, the invention has the beneficial effects as follows:
1, this terminal is by repeatedly amplifying, filtering, the filtering interference of other signal heavier, structure is simple, the signal seedbed end provided at feedback end and the electrocardio input terminal of preamplifier sets up Commom-mode feedback, this negative feedback utilizes feedback circuit to realize, to improve the depth of feedback of circuit, preamplifier is still adopted to access the signal source reference edge of electrocardio input terminal generation after feedback signal being amplified, Hz noise can be offset to greatest extent like this, improve the accuracy of last electrocardiosignal, for the diagnosis of disease below provides reference more accurately.
2, the power frequency interference signals that the further filtering human body of 50Hz wave trap produces also is set in the terminal, improves the accuracy exporting electrocardiosignal further.
Accompanying drawing explanation
Fig. 1 is theory diagram of the present invention;
Fig. 2 is high-pass filtering circuit figure.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is further elaborated, and embodiments of the invention are not limited thereto.
Embodiment 1:
As shown in Figure 1-2, the present invention includes the preamplifier, high-pass filtering circuit, 50Hz wave trap, main amplifier and the low pass filter that connect successively, preamplifier also connects feedback circuit, between feedback circuit and preamplifier, connect electrocardio input terminal, also connect level shift circuit and amplification modulate circuit successively at the rear of low pass filter.Need the amplification of the electrocardiosignal at measurement electrode two ends through preamplifier in the gatherer process of electrocardiosignal, then allow detected signal by high pass circuit filtering baseline drift, at this moment the electrocardiosignal amplitude detected is very little, and be mixed into a large amount of 50Hz interfering signals, then needed to filter out power frequency interference signals by 50Hz wave trap.Then need again the electrocardiosignal after process to be amplified, and then through the filter action of low pass filter, the interference of filtering various high-frequency noise, most relief electrocardiosignal just can obtain electrocardiosignal accurately by level shift circuit and amplification modulate circuit.In order to the signal seedbed end provided at feedback end and the electrocardio input terminal of preamplifier sets up Commom-mode feedback, this negative feedback utilizes feedback circuit to realize, to improve the depth of feedback of circuit, still adopt preamplifier to access the signal source reference edge of electrocardio input terminal generation after feedback signal being amplified, Hz noise can be offset to greatest extent like this.In addition, in the gatherer process of electrocardiosignal, there is the common-mode signal interference of 50Hz in human body, because the common mode rejection ratio of preamplifier neither be infinitely great, the difference of the contact resistance at measurement electrode two ends, and shielding line can not effectively shield space 50Hz interfering signal completely, these many situations finally cause the input of power frequency 50Hz interfering signal at instrument amplifier AD620 to the conversion of difference mode signal, so need filtering 50Hz Hz noise, and the setting of 50Hz wave trap further effectively can suppress this power frequency interference signals, thus improve the last accuracy exporting electrocardiosignal further.
Embodiment 2:
The present embodiment is preferably as follows on the basis of embodiment 1: described high-pass filtering circuit comprises electric capacity C and resistance R, and electric capacity C two ends connect preamplifier and 50Hz wave trap respectively, also connects pull down resistor R at the outfan of electric capacity C.This high-pass filtering circuit structure is simple, can also play a multiplier effect to partition DC channel and elimination baseline drift, the interference of a filtering part.
The model of described main amplifier is OP07, and the amplification of main amplifier is between 140-150.This main amplifier is mainly used in improving gain.
The model of described preamplifier is AD620.This amplifier has higher common mode rejection ratio (CMRR), and temperature stability is good, and amplification band is wide, and noise coefficient is little and have feature easy to adjust, is the ideal chose that biomedicine signals amplifies.According to the design principle of small signal amplifier, the gain of preamplifier can not arrange too high, because pregain is too high will be unfavorable for the process of subsequent conditioning circuit to noise.
Described low pass filter is the low pass filter of 100Hz.Frequency range due to electrocardiosignal is general all at 0-100Hz, so need the low pass circuit of electrocardiosignal by 100Hz.
Just this invention can be realized as mentioned above.
Claims (5)
1. Electrocardial signal acquisition device, it is characterized in that: comprise the preamplifier, high-pass filtering circuit, 50Hz wave trap, main amplifier and the low pass filter that connect successively, preamplifier also connects feedback circuit, between feedback circuit and preamplifier, connect electrocardio input terminal, also connect level shift circuit and amplification modulate circuit successively at the rear of low pass filter.
2. Electrocardial signal acquisition device according to claim 1, is characterized in that: described high-pass filtering circuit comprises electric capacity C and resistance R, and electric capacity C two ends connect preamplifier and 50Hz wave trap respectively, also connects pull down resistor R at the outfan of electric capacity C.
3. Electrocardial signal acquisition device according to claim 1, is characterized in that: the model of described main amplifier is OP07, and the amplification of main amplifier is between 140-150.
4. Electrocardial signal acquisition device according to claim 1, is characterized in that: the model of described preamplifier is AD620.
5. Electrocardial signal acquisition device according to claim 1, is characterized in that: described low pass filter is the low pass filter of 100Hz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510583598.6A CN105105744A (en) | 2015-09-15 | 2015-09-15 | Electrocardiosignal collector |
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| CN201510583598.6A CN105105744A (en) | 2015-09-15 | 2015-09-15 | Electrocardiosignal collector |
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| CN105105744A true CN105105744A (en) | 2015-12-02 |
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| CN201510583598.6A Pending CN105105744A (en) | 2015-09-15 | 2015-09-15 | Electrocardiosignal collector |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107773237A (en) * | 2016-08-24 | 2018-03-09 | 四川锦江电子科技有限公司 | A kind of R ripples detection means |
| CN108309280A (en) * | 2018-02-11 | 2018-07-24 | 许少辉 | The signal intensifier circuit of electrocardiograph |
| CN113261970A (en) * | 2021-03-19 | 2021-08-17 | 苏州护心宝健康科技有限公司 | Non-contact type electrocardiogram monitoring circuit capable of effectively inhibiting action interference |
| CN113325265A (en) * | 2021-05-12 | 2021-08-31 | 武汉三相电力科技有限公司 | Device for detecting mixed traveling wave in power transmission line |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0486399A1 (en) * | 1990-11-14 | 1992-05-20 | Centro De Neurociencias De Cuba | Biopotential amplifier |
| EP1477114A1 (en) * | 2003-05-13 | 2004-11-17 | GME Rechte und Beteiligungen GmbH | Device and method for detecting atrial fibrillation |
| CN104586381A (en) * | 2015-01-19 | 2015-05-06 | 成都信息工程学院 | Electrocardiograph monitoring system based on Internet of Things |
| CN104799849A (en) * | 2015-05-19 | 2015-07-29 | 南京大学 | Portable sleep apnea syndrome monitoring method and device |
| CN205006891U (en) * | 2015-09-15 | 2016-02-03 | 成都汉康信息产业有限公司 | Electrocardio signal acquisition terminal |
-
2015
- 2015-09-15 CN CN201510583598.6A patent/CN105105744A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0486399A1 (en) * | 1990-11-14 | 1992-05-20 | Centro De Neurociencias De Cuba | Biopotential amplifier |
| EP1477114A1 (en) * | 2003-05-13 | 2004-11-17 | GME Rechte und Beteiligungen GmbH | Device and method for detecting atrial fibrillation |
| CN104586381A (en) * | 2015-01-19 | 2015-05-06 | 成都信息工程学院 | Electrocardiograph monitoring system based on Internet of Things |
| CN104799849A (en) * | 2015-05-19 | 2015-07-29 | 南京大学 | Portable sleep apnea syndrome monitoring method and device |
| CN205006891U (en) * | 2015-09-15 | 2016-02-03 | 成都汉康信息产业有限公司 | Electrocardio signal acquisition terminal |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107773237A (en) * | 2016-08-24 | 2018-03-09 | 四川锦江电子科技有限公司 | A kind of R ripples detection means |
| CN108309280A (en) * | 2018-02-11 | 2018-07-24 | 许少辉 | The signal intensifier circuit of electrocardiograph |
| CN113261970A (en) * | 2021-03-19 | 2021-08-17 | 苏州护心宝健康科技有限公司 | Non-contact type electrocardiogram monitoring circuit capable of effectively inhibiting action interference |
| CN113325265A (en) * | 2021-05-12 | 2021-08-31 | 武汉三相电力科技有限公司 | Device for detecting mixed traveling wave in power transmission line |
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Application publication date: 20151202 |