CN201267470Y - 12-channel digital electrocardiosignal acquisition module - Google Patents
12-channel digital electrocardiosignal acquisition module Download PDFInfo
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- CN201267470Y CN201267470Y CNU2008201903710U CN200820190371U CN201267470Y CN 201267470 Y CN201267470 Y CN 201267470Y CN U2008201903710 U CNU2008201903710 U CN U2008201903710U CN 200820190371 U CN200820190371 U CN 200820190371U CN 201267470 Y CN201267470 Y CN 201267470Y
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- 229910021607 Silver chloride Inorganic materials 0.000 claims abstract description 8
- HKZLPVFGJNLROG-UHFFFAOYSA-M silver monochloride Chemical compound [Cl-].[Ag+] HKZLPVFGJNLROG-UHFFFAOYSA-M 0.000 claims abstract description 8
- 238000001914 filtration Methods 0.000 claims description 15
- 230000003139 buffering effect Effects 0.000 claims description 14
- 238000007667 floating Methods 0.000 claims description 12
- 239000003990 capacitor Substances 0.000 claims description 4
- 238000012544 monitoring process Methods 0.000 description 7
- 230000005540 biological transmission Effects 0.000 description 5
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 4
- 229910052744 lithium Inorganic materials 0.000 description 4
- 230000000747 cardiac effect Effects 0.000 description 3
- 230000003321 amplification Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 229910052732 germanium Inorganic materials 0.000 description 1
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 210000003141 lower extremity Anatomy 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- Measurement And Recording Of Electrical Phenomena And Electrical Characteristics Of The Living Body (AREA)
Abstract
The utility model provides a twelve channel digital electrocardiosignal collecting module which is provided with a medical silver chloride electrode (1) connectd by a shielding cable (2), an input baffle and resistance network (3), a power source, an analog-to-digital converter, and a filter circuit, an amplifying circuit and a ground-free drive circuit, as well as an ECG amplifying circuit (4), an interface module (9) and a field programmable gate array (12); wherein, the input baffle and resistance network is connected with the interface module by the ECG amplifying circuit, a high-pass filter circuit (5), a low-pass filter circuit (6), a final amplifier (7) and the analog-to-digital converter (8); the three connecting ports of the field programmable gate array are respectively connected with the input baffle and resistance network, the analog-to-digital converter and the interface module; the output end of the ground-free drive circuit is connected with the public ground of the input baffle and resistance network and the ECG amplifying circuit; and the input end of the ground-free drive circuit is connected with the shielding end of the shielding cable. The utility model is convenient to be used, and can carry out collecting and treatment on the electrocardiosignal in real time in a distortionless way.
Description
Technical field
This utility model relates to a kind of 12 passages numeral ecg signal acquiring module.
Background technology
The ecg signal acquiring module is used for the faint electrocardiosignal of human body body surface, is the most key part of cardiac monitoring, and the important clinical diagnostic value is arranged.Control for the heart patient mainly is to adopt cardiac monitoring equipment to observe at present, and these equipment mainly are divided into two kinds: electrocardiograph and dynamic cardiograph (Holter).There are many weak points in electrocardiograph on power consumption, volume, weight, determined to use at fixed-site (as hospital); Dynamic cardiograph all is not easy to common patient and uses in cost and operation.In addition, these two kinds of equipment limit to below obtaining in real time of electrocardiosignal all exists: electrocardiograph can only obtain electrocardiosignal the short time, and dynamic cardiograph need add mass storage and utilize host computer just can read the data of electrocardiosignal.
Therefore, numerous scholars and engineer begin to develop a kind of general module in the hope of obtaining balance on performance, power consumption, portability, and can add microprocessor or PC flexibly to realize particular requirement.As: electrocardiosignal transducer and analog-digital conversion unit (CN1579325A) thereof; Be used to handle the system (CN1568158A) of the signal data of representing physiological parameter; Bioelectrical detection circuit and detection method thereof (CN1316940C); Digital remote radio electrocardiographicmonitoring monitoring system (CN1657003A); Novel household electrocardiograph (CN1332630C); A kind of multifunction medical diagnosis integrated circuit (CN1849996A); Has the high electrocardio testing circuit (CN2912512Y) that suppresses the noise ability etc.
But above-mentioned these ecg signal acquiring modules or some defectives of device ubiquity: circuit structure complexity, debug difficulties, circuit structure are comparatively outmoded simply again, performance does not reach requirement, transmission means falls behind, data that can't transmission of large capacity, and make mistakes easily in the transmission course; The signal acquisition module of some instrument has been used the power frequency notch filter of 50Hz in analog circuit, make the waveform display distortion, thereby influences result of use.
Summary of the invention
Technical problem to be solved in the utility model is: at the prior art defective, provide a kind of structure simple relatively, 12 passages numeral ecg signal acquiring module stable and reliable for performance.
The technical scheme that its technical problem that solves this utility model adopts is: be provided with the medical silver chloride electrode and input buffering and the resistor network that connect with shielded cable, power supply, analog-digital converter and filtering, amplification and floating ground drive circuit, and electrocardio amplifying circuit, interface module and field programmable gate array.Wherein: the big circuit of the careful tele-release of input buffering and resistor network, high-pass filtering circuit, low-pass filter circuit and final amplifier, analog-digital converter are connected to interface module.Three connectivity ports of field programmable gate array link to each other with input buffering and resistor network, analog-digital converter, interface module respectively.Floating ground drive circuit, its outfan are connected to the public ground of input buffering and resistor network and electrocardio amplifying circuit, and its input links to each other with the shielding end of shielded cable.
This utility model compared with prior art has following main beneficial effect:
1. can carry out continuous monitoring to electrocardiosignal, the monitored signal port number is many, can discern the electrocardiogram (ECG) data of heart rate, QRS amplitude, ST section.
2. volume is small and exquisite, is easy to carry.
3. circuit structure is simple relatively, has high cmrr and high input impedance, and common mode rejection ratio can reach 120dB, is not less than 90dB under the strong jamming, without any need for debugging.
4. have that interface module is convenient to and compunication, set up ecg database.
In a word, this utility model has adopted novel circuit structure, therefore can realize the undistorted collection of electrocardiosignal under the high input impedance high cmrr, and stable ecg signal data can be provided, thereby provide front end solution cheaply for cardiac monitoring equipment.
Description of drawings
Fig. 1 is a structural representation of the present utility model.
Fig. 2 is electrocardio amplifying circuit 4 among Fig. 1 and the circuit theory diagrams that float ground drive circuit 10.
Among the figure: 1. medical silver chloride electrode; 2. shielded cable; 3. input buffering and resistor network; 4. electrocardio amplifying circuit; 5. high-pass filtering circuit; 6. low-pass filter circuit; 7. final stage amplifying circuit; 8. analog-digital converter; 9. interface module; 10. float the ground drive circuit; 11. power supply and charging commutation circuit; 12. field programmable gate array.
The specific embodiment
The 12 passages numeral ecg signal acquiring module that this utility model provides, be to extract electrocardiosignal from body surface by medical silver chloride electrode 1, be connected to buffer circuit and resistor network 3 by shielded cable 2, floating ground of the shielding termination of shielded cable drive circuit has reduced the influence of distribution capacity.The input of buffer circuit has the germanium diode of two reverse parallel connections, has the function of overvoltage protection, prevents that the static electricity on human body from causing damage to circuit, and buffer circuit comprises that also the follower that is made of operational amplifier is used to improve input impedance.
The utility model is described in further detail below in conjunction with embodiment and accompanying drawing.
The 12 passages numeral ecg signal acquiring module that this utility model provides, its structure is as shown in Figure 1: be provided with the medical silver chloride electrode 1 and input buffering and resistor network 3 that connect with shielded cable 2, power supply, analog-digital converter and filtering, amplification and floating ground drive circuit, and electrocardio amplifying circuit 4, interface module 9 and field programmable gate array 12.Wherein: input buffering and the big circuit 4 of resistor network 3 careful tele-releases, high-pass filtering circuit 5, low-pass filter circuit 6 and final amplifier 7, analog-digital converter 8 are connected to interface module 9.Three connectivity ports of field programmable gate array 12 link to each other with input buffering and resistor network 3, analog-digital converter 8, interface module 9 respectively.Floating ground drive circuit 10, its outfan are connected to the public ground of input buffering and resistor network 3 and electrocardio amplifying circuit 4, and its input links to each other with the shielding end of shielded cable 2, to eliminate distribution capacity.
Input buffering and resistor network 3 are made up of the resistor network of input buffer circuit with overvoltage protection and low-pass filtering function and switching electrocardiosignal passage.The switching of resistor network is selected the passage of monitoring by field programmable gate array 12 (FPGA, Field-Programmable Gate Array) control, realizes the signals collecting of different passages.FPGA can select the EP2C8 series of products of ALTERA company, perhaps the IGLOO series of products of ACTEL company.
Electrocardiosignal enters resistor network after by buffer circuit, and the signal of passage is connected to electrocardio amplifying circuit 4 and floating ground drive circuit 10 input filter circuits.
The composition of electrocardio amplifying circuit 4 is as shown in Figure 2: be provided with two differential amplifiers in parallel, the equal parallel connected in reverse phase of their input has two diodes saturated to prevent to export, their outfan is connected to the forward end of the integrated package A7 in the floating ground drive circuit 10, their outfan is connected to the input of high-pass filtering circuit 5 again through integrated package A5, " outfan " among Fig. 2 is meant the outfan of A5.Two differential amplifiers in parallel comprise integrated package A1, A2, A3, A4, and the parameter of resistance R 1, R2, R3, R6 and resistance R 9, R4, R6, R10 is symmetry fully, and this structure can not only effectively improve common mode rejection ratio, and has increased input impedance.A1 and A4 are used to suppress polarizing voltage, improve input impedance.Resistance R 1, R9, capacitor C 1 and operational amplifier A 2, A3 form a two-port network, are connected to high-pass filtering circuit, have the high-order lowpass filter circuit to be used to suppress High-frequency Interference between high-pass filtering circuit and serial analog to digital conversion circuit.Capacitor C 3, C4 have added feedback circuit, have suppressed baseline drift.
The signal input high-pass filtering circuit 5 and the low-pass filter circuit 6 of the careful big circuit 4 of tele-release, high-pass filtering circuit and low-pass filter circuit are the quadravalence circuit, its amplitude-frequency individual features can reach 80dB, its structure is respectively voltage-controlled potential source and the negative feedback of unlimited gain multichannel, is used for further reducing baseline drift and High-frequency Interference.Filter circuit all is designed to the Bezier characteristic, and promptly the quality factor of two-stage circuit are respectively 0.52 and 0.81.The signal of the final output of low-pass filter circuit is connected to analog-digital converter 8 by final stage amplifying circuit 7, analog-digital converter adopts serial mode, gather sequential by FPGA control, the data that collect processing biography through digital filtering and recognizer in FPGA is stored in the on-chip memory, form FIFO (First in first out, first in first out) structure conveniently offers interface module 9 and realizes and external partial data transmission.
Described interface module 9 is provided with and connects USB, SPI and I
2The interface of C sequential, and+interface of 5V power supply.Various communications protocols that interface module 9 is integrated comprises SPI (Serial Peripheral interface, Serial Peripheral Interface), I
2C (InterIntegrated Circuit, double wire system universal serial bus), USB (Universal Serial Bus, USB (universal serial bus)) etc. can external easily microprocessors or communicate by letter with host computer, set up the ecg database of institute's monitoring target.
Described floating ground drive circuit 10 is made of integrated package A6, A7, is used for the human body common-mode signal is amplified the back feedback excitation to human body, thereby reduces common-mode voltage, has suppressed the power frequency of 50Hz strongly and has disturbed.As shown in Figure 2: the outfan of A7 is connected to the end of oppisite phase of A6 through resistance R 16, is connected to the outfan of A6 again through resistance R 15, and the forward end of A6 is through resistance R 17 ground connection.Be provided with resistance R 14, the capacitor C 2 of serial connection, they are connected across the two ends of resistance R 15.
Above-mentioned electrocardio amplifying circuit 4, final stage amplifying circuit 7, high-pass filtering circuit 5, low-pass filter circuit 6, FPGA and microprocessor all are connected with power circuit, are powered by power circuit.
Power supply of the present utility model is provided by two joint chargeable lithium cells, and the charging commutation circuit arranged, chargeable lithium cell and charging circuit have constituted power supply and charging commutation circuit 11, when not connecing alternating current, use lithium battery power supply, when connecting alternating current, automatically switch to alternating current and be lithium cell charging simultaneously for module provides power supply.AC/DC.
This utility model links to each other with the outside by interface module 9, and SPI, I are provided
2Sequential mode when C, USB etc.
The work process of this utility model 12 passages numeral ecg signal acquiring module (being called for short the electrocardiogram acquisition module) is as follows:
The input of body surface with the electrocardiogram acquisition module is connected by shielded cable 2 by medical silver chloride electrode 1 earlier, the medical silver chloride electrode 1 main positions such as left and right arms, left and right sides lower limb and chest that connect human body, the faint electrocardiosignal of body surface inputs to the electrocardiogram acquisition module through difference input 1 and 2 (Fig. 2).So the work of electrocardiogram acquisition module: faint electrocardiosignal is by having the buffer circuit of over-voltage protecting function; resistor network conditioning back output 12 passage electrocardiosignaies by FPGA control; be converted into digital quantity signal by input analog-to-digital converter behind filter circuit and the final stage amplifying circuit then; this signal repeated transmission is transported to FPGA; carry out the inhibition of baseline drift and handle, the ecg signal data after finally can will handling by the various interface of interface module 9 offers corresponding custodial care facility.
Claims (6)
1. passage numeral ecg signal acquiring module, be provided with the medical silver chloride electrode (1) and input buffering and resistor network (3) that connect with shielded cable (2), and power supply, analog-digital converter and filtering, amplify and floating ground drive circuit, it is characterized in that also being provided with electrocardio amplifying circuit (4), interface module (9) and field programmable gate array (12), wherein: the careful big circuit of tele-release (4) of input buffering and resistor network (3), high-pass filtering circuit (5), low-pass filter circuit (6) and final amplifier (7), analog-digital converter (8) is connected to interface module (9); Three connectivity ports of field programmable gate array (12) link to each other with input buffering and resistor network (3), analog-digital converter (8), interface module (9) respectively; Floating ground drive circuit (10), its outfan are connected to the public ground of input buffering and resistor network (3) and electrocardio amplifying circuit (4), and its input links to each other with the shielding end of shielded cable (2).
2. 12 passages according to claim 1 numeral ecg signal acquiring module, it is characterized in that: interface module (9) is provided with the interface that connects USB, SPI and I2C sequential, and+interface of 5V power supply.
3. 12 passages numeral ecg signal acquiring module according to claim 1, it is characterized in that: described electrocardio amplifying circuit (4) is provided with two differential amplifiers in parallel, the equal parallel connected in reverse phase of their input has two diodes, their outfan is connected to the forward end of the integrated package A7 in the floating ground drive circuit (10), and their outfan is connected to the outfan of high pass circuit again through integrated package A5.
4. 12 passages numeral ecg signal acquiring module according to claim 1, it is characterized in that floating ground drive circuit (10) is provided with integrated package A6, A7, wherein: the outfan of A7 is connected to the end of oppisite phase of A6 through resistance R 16, be connected to the outfan of A6 again through resistance R 15, the forward end of A6 is through resistance R 17 ground connection.
5. 12 passages numeral ecg signal acquiring module according to claim 4, it is characterized in that: be provided with resistance R 14, the capacitor C 2 of serial connection, they are connected across the two ends of resistance R 15.
6. 12 passages numeral ecg signal acquiring module according to claim 1, it is characterized in that: power supply is provided with the charging commutation circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201903710U CN201267470Y (en) | 2008-08-19 | 2008-08-19 | 12-channel digital electrocardiosignal acquisition module |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201903710U CN201267470Y (en) | 2008-08-19 | 2008-08-19 | 12-channel digital electrocardiosignal acquisition module |
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| Publication Number | Publication Date |
|---|---|
| CN201267470Y true CN201267470Y (en) | 2009-07-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNU2008201903710U Expired - Fee Related CN201267470Y (en) | 2008-08-19 | 2008-08-19 | 12-channel digital electrocardiosignal acquisition module |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102319066A (en) * | 2011-08-16 | 2012-01-18 | 中国人民解放军***武汉总医院 | Array type electrode and multi-channel matrix type spatial summation electrocardiogram detection system thereof |
| CN102764117A (en) * | 2012-04-25 | 2012-11-07 | 重庆大学 | Portable fetal ECG monitor |
| CN103876735A (en) * | 2014-03-27 | 2014-06-25 | 王远志 | System and method for collecting high-performance brain electrical signals |
-
2008
- 2008-08-19 CN CNU2008201903710U patent/CN201267470Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102319066A (en) * | 2011-08-16 | 2012-01-18 | 中国人民解放军***武汉总医院 | Array type electrode and multi-channel matrix type spatial summation electrocardiogram detection system thereof |
| CN102764117A (en) * | 2012-04-25 | 2012-11-07 | 重庆大学 | Portable fetal ECG monitor |
| CN103876735A (en) * | 2014-03-27 | 2014-06-25 | 王远志 | System and method for collecting high-performance brain electrical signals |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090708 Termination date: 20120819 |