CN104706344A - Electrocardiosignal measurement collecting system - Google Patents
Electrocardiosignal measurement collecting system Download PDFInfo
- Publication number
- CN104706344A CN104706344A CN201310667694.XA CN201310667694A CN104706344A CN 104706344 A CN104706344 A CN 104706344A CN 201310667694 A CN201310667694 A CN 201310667694A CN 104706344 A CN104706344 A CN 104706344A
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- amplifier
- circuit
- signal
- converter
- preamplifier
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- 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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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
- A61B5/316—Modalities, i.e. specific diagnostic methods
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
- A61B5/7203—Signal processing specially adapted for physiological signals or for diagnostic purposes for noise prevention, reduction or removal
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
- A61B5/7225—Details of analog processing, e.g. isolation amplifier, gain or sensitivity adjustment, filtering, baseline or drift compensation
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Heart & Thoracic Surgery (AREA)
- Medical Informatics (AREA)
- Biophysics (AREA)
- Pathology (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Cardiology (AREA)
- Physics & Mathematics (AREA)
- Molecular Biology (AREA)
- Surgery (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Measurement And Recording Of Electrical Phenomena And Electrical Characteristics Of The Living Body (AREA)
Abstract
The invention relates to an electrocardiosignal measurement collecting system. The collecting system is composed of an electrode sensor, a pre-amplifier, a filter circuit, a second-stage amplifier, a 50 HZ trapped wave circuit, an A/D converter and a single chip microcomputer; the output end of the electrode sensor is connected with the pre-amplifier, and signals are amplified through the pre-amplifier; the pre-amplifier is connected with the filter circuit to conduct filtering processing on the signals; the filter circuit is then connected with the second-stage amplifier; and the second-stage amplifier is connected with the 50 HZ trapped wave circuit, the output end of the 50 HZ trapped wave circuit is connected with the A/D converter, and the output end of the A/D converter is connected with the single chip microcomputer. The electrocardiosignal measurement collecting system has the beneficial effects of being exquisite in structure, convenient to use and the like.
Description
Technical field
The present invention relates to a kind of signal acquiring system, especially a kind of ECG Signal Sampling System.
Background technology
ECG data analyzer is one of important diagnostic method of heart disease.Electrocardiogram is supplementary means conventional in clinical disease diagnosis.ECG Acquisition System is the critical component of electrocardiogram detecting instrument.After the electrical signal conduction that human body cardiac muscle produces to body surface, produce potential difference due to the difference distributed at body surface, only had by this voltage the potential difference of mV rank to amplify and drafting pattern, just obtain electrocardiogram (ECG).The primary frequency range of human ecg signal is 0.05 ~ 100Hz, and amplitude is about 0.01 ~ 5mV, and signal is very faint.So want electrocardiosignal to amplify, there is other bioelectrical signals owing to usually mixing in electrocardiosignal, in addition external based on the interference of the electromagnetic field of 50Hz Hz noise, make electrocardio noise background comparatively strong, measuring condition more complicated.In order to detect the clean electrocardiosignal of clinical value without distortion, often require that ECG Acquisition System has the performances such as high accuracy, high stability, high input impedance, high cmrr, low noise and strong anti-interference ability.
Summary of the invention
The object of this invention is to provide a kind of electrocardiosignal easy to carry, easy-to-use, simple to operate and measure acquisition system.
Acquisition system of the present invention is made up of electrode sensor, preamplifier, filter circuit, two-stage amplifier, 50HZ trap circuit, A/D converter and single-chip microcomputer; Electrode sensor outfan is connected with preamplifier, is amplified by signal by preamplifier; Preamplifier is connected with filter circuit, and signal is carried out Filtering Processing; Filter circuit is connected with two-stage amplifier again; Two-stage amplifier is connected with 50HZ trap circuit, and 50HZ trap circuit outfan is connected with A/D converter, and single-chip microcomputer connected by A/D converter outfan.
Described electrode sensor is made up of four crosslinking electrodes.
Compared with the prior art, beneficial effect of the present invention is: reasonable in design, convenient and practical, measure precisely, volume is little, carry deposit conveniently, cost is low.
Accompanying drawing explanation
Fig. 1 is structured flowchart of the present invention.
Detailed description of the invention
In the structured flowchart of the present invention shown in Fig. 1, described acquisition system is made up of electrode sensor, preamplifier, filter circuit, two-stage amplifier, 50HZ trap circuit, A/D converter and single-chip microcomputer; Electrode sensor outfan is connected with preamplifier, is amplified by signal by preamplifier; Preamplifier is connected with filter circuit, and signal is carried out Filtering Processing; Filter circuit is connected with two-stage amplifier again; Two-stage amplifier is connected with 50HZ trap circuit, and 50HZ trap circuit outfan is connected with A/D converter, and single-chip microcomputer connected by A/D converter outfan.
Described electrode sensor is made up of four crosslinking electrodes.
Crosslinking electrode illustrates:
RA: right arm; LA: left arm; LL: left lower limb; RL: right lower limb.
First via electrocardiosignal, i.e. the standard I electrode connection of leading: RA connects amplifier inverting input (-), and LA connects amplifier in-phase input end (+), RL, as with reference to electrode, connects ecg amplifier reference point.
Second tunnel electrocardiosignal, i.e. the standard I I electrode connection of leading: RA connects amplifier inverting input (-), and LL connects amplifier in-phase input end (+), RL, as with reference to electrode, connects ecg amplifier reference point.
RA, LA, LL are connected with ecg signal amplifier respectively by the shielding conducting wire that 1.5m is long with the skin-contacting electrodes of RL.
Electrocardiosignal is sent into preamplifier after being picked up by electrode special and is tentatively amplified, send into wave filter, respectively after high pass, low pass with the interfering signal beyond filtering electrocardio frequency range, filtered signal can be amplified to OK range further through two-stage amplifier, then through the trap circuit elimination Hz noise of 50Hz.The electrocardiosignal now exported meets the demands, and can show on oscillograph.Then satisfactory ECG simulator signal is become digital signal be stored in single-chip microcomputer through high-precision A/D conversion.
Integrated circuit is divided into 5 modules, is prime amplification module, high pass+low-pass filtering module, rear class amplification module, notch filter module, A/D modular converter respectively.
Enlarge leadingly is the key link of electrocardio-data collection.Because human ecg signal is very faint, noise background is strong and genertor impedance is larger, in addition the polarizing voltage difference of electrode introducing comparatively large (hundred times larger than electrocardio difference amplitude), therefore, usually require that preamplifier has high input impedance, high cmrr, low noise, low drifting, the performance such as frequency band and dynamic range that nonlinearity is little, suitable, during design, generally all adopt differential amplifier circuit.In experimental provision, input signal directly can be picked up by the electrocardioelectrode being placed on human body right arm (RA) and left lower limb (LL).Because human ecg signal is very faint, signal amplitude is between 0.01 ~ 5mV, noise background is strong and impedance between electrode and skin is quite large, therefore, require that one-level amplifying circuit has high input impedance, the performances such as the frequency band that high cmrr, low noise, low drifting, nonlinearity are little, suitable and dynamic range.
The specific design of scheme---use instrumentation amplifier AD620
AD620 input has the characteristics such as low input bias current, low noise, high accuracy, higher Time Created, low-power consumption, and common mode rejection ratio can reach 130dB, is suitable as very much preamplifier and uses.Select AD620 to carry out one-level amplification, its core is three discharge circuits, and its internal structure is substantially identical with the structure of above-mentioned analog circuit.It is 100dB that AD620 has higher common mode rejection ratio CMRR minimum, and precision is high, and temperature stability is good, and amplification band is wide, and noise coefficient is little.Its adjustable gain, adjustable extent about 1 ~ 1000 times.AD620 has Low-bias Current, low noise, adds that low-voltage current noise resistance is 1 M Ω or higher, it be 8 feet encapsulation, carry easy for installation, these performances make AD620 meet our requirement.Spacer assembly will be added between this external people and instrument.C3, C5, C4, C2 are filter capacitor, eliminate power supply disturbance.
For prevent preamplifier work in full district and or cut-off region, its gain can not be excessive.Test shows: about 10 times effects are better.Be used for encouraging the right lower limb of human body after the paraphase of human body common-mode signal can being amplified by " floating ground " drive circuit formed, thus reduction even offsets common-mode voltage, to reach the object of comparatively high inhibition 50Hz Hz noise, in order to coordinate signal input circuit, we adopt one of them amplifier of LM224 to realize.LM224 has four amplifiers integrated, and the differential wave input of left hand and the right hand connects a follower (namely using two amplifiers in LM224) respectively, is mainly used in stable input signal and improves input impedance, improving common mode rejection ratio further.
By analyzing above, we select the resistance of Rg=5.1k, so the first order is enlarged into 10.686 times, after amplifying circuit amplify 100 times namely available oscillograph observe signal.
Filter circuit
Wherein the interfering signal of more than 100Hz is comparatively strong and the interfering signal of below 0.05Hz is relatively weak, so take first low-pass filtering to take out the signal of below 100Hz in filter circuit, then connects the mode of high pass, thus filtering polarizing voltage and High-frequency Interference.
High-pass filtering (filter low frequency)
Because the dominant interferer existed in detection signal has the interference etc. of polarizing voltage, 50Hz Hz noise, instrument internal noise and surrounding equipment electric field between battery lead plate and people, magnetic field, electromagnetic field, want to obtain steady and audible electrocardiosignal, the design of wave filter is very crucial.Primary frequency range due to human ecg signal be frequency at 0.05 ~ 100Hz, in order to eliminate low-frequency noise, one-level amplify after add high-pass filtering circuit, its lower-cut-off frequency is located at 0.05 Hz.
Trap circuit
But interference the most serious is the 50Hz of mains supply, therefore also the band elimination filter (also known as wave trap) of a 50Hz power supply disturbance must be suppressed further.We adopt double-T shaped trap circuit, and figure below is depicted as the trap circuit of wherein one-level, and in order to reach better effect, we devise two-stage with a LM224, can well suppress the Hz noise of 50Hz through test.
Claims (2)
1. electrocardiosignal measures an acquisition system, it is characterized in that: described acquisition system is made up of electrode sensor, preamplifier, filter circuit, two-stage amplifier, 50HZ trap circuit, A/D converter and single-chip microcomputer; Electrode sensor outfan is connected with preamplifier, is amplified by signal by preamplifier; Preamplifier is connected with filter circuit, and signal is carried out Filtering Processing; Filter circuit is connected with two-stage amplifier again; Two-stage amplifier is connected with 50HZ trap circuit, and 50HZ trap circuit outfan is connected with A/D converter, and single-chip microcomputer connected by A/D converter outfan.
2. a kind of electrocardiosignal according to claim 1 measures acquisition system, it is characterized in that: described electrode sensor is made up of four crosslinking electrodes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310667694.XA CN104706344A (en) | 2013-12-11 | 2013-12-11 | Electrocardiosignal measurement collecting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310667694.XA CN104706344A (en) | 2013-12-11 | 2013-12-11 | Electrocardiosignal measurement collecting system |
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| CN104706344A true CN104706344A (en) | 2015-06-17 |
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| CN201310667694.XA Pending CN104706344A (en) | 2013-12-11 | 2013-12-11 | Electrocardiosignal measurement collecting system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107928662A (en) * | 2017-12-07 | 2018-04-20 | 深圳市优科无线有限公司 | A kind of electrocardio wearable device supported in wrist and chest while measurement |
| CN111238586A (en) * | 2020-03-27 | 2020-06-05 | 上海市计量测试技术研究院 | Electromagnetic flowmeter for measuring low conductivity and rate measuring method thereof |
| CN112968682A (en) * | 2021-01-29 | 2021-06-15 | 清华大学深圳国际研究生院 | Weak current amplifying circuit and sensor system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6658284B1 (en) * | 1998-12-22 | 2003-12-02 | Neoventa Medical Ab | Device for reducing signal noise in a fetal ECG signal |
| CN201200400Y (en) * | 2008-04-24 | 2009-03-04 | 许新朋 | Cardiac electric analyzer |
| CN201453266U (en) * | 2009-08-31 | 2010-05-12 | 天津市岐黄科技开发有限公司 | Embedded electrocardiograph wave screening device |
| CN203138478U (en) * | 2013-03-10 | 2013-08-21 | 杨波 | Wearable electrocardiogram monitoring system based on 3G network |
-
2013
- 2013-12-11 CN CN201310667694.XA patent/CN104706344A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6658284B1 (en) * | 1998-12-22 | 2003-12-02 | Neoventa Medical Ab | Device for reducing signal noise in a fetal ECG signal |
| CN201200400Y (en) * | 2008-04-24 | 2009-03-04 | 许新朋 | Cardiac electric analyzer |
| CN201453266U (en) * | 2009-08-31 | 2010-05-12 | 天津市岐黄科技开发有限公司 | Embedded electrocardiograph wave screening device |
| CN203138478U (en) * | 2013-03-10 | 2013-08-21 | 杨波 | Wearable electrocardiogram monitoring system based on 3G network |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107928662A (en) * | 2017-12-07 | 2018-04-20 | 深圳市优科无线有限公司 | A kind of electrocardio wearable device supported in wrist and chest while measurement |
| CN111238586A (en) * | 2020-03-27 | 2020-06-05 | 上海市计量测试技术研究院 | Electromagnetic flowmeter for measuring low conductivity and rate measuring method thereof |
| CN111238586B (en) * | 2020-03-27 | 2021-08-20 | 上海市计量测试技术研究院 | Electromagnetic flowmeter for measuring low conductivity and rate measuring method thereof |
| CN112968682A (en) * | 2021-01-29 | 2021-06-15 | 清华大学深圳国际研究生院 | Weak current amplifying circuit and sensor system |
| CN112968682B (en) * | 2021-01-29 | 2022-03-29 | 清华大学深圳国际研究生院 | Weak current amplifying circuit and sensor system |
| WO2022160953A1 (en) * | 2021-01-29 | 2022-08-04 | 清华大学深圳国际研究生院 | Weak current amplifier circuit and sensor system |
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Application publication date: 20150617 |