CN205215213U - Novel electrocardio guardianship device - Google Patents
Novel electrocardio guardianship device Download PDFInfo
- Publication number
- CN205215213U CN205215213U CN201520964215.5U CN201520964215U CN205215213U CN 205215213 U CN205215213 U CN 205215213U CN 201520964215 U CN201520964215 U CN 201520964215U CN 205215213 U CN205215213 U CN 205215213U
- Authority
- CN
- China
- Prior art keywords
- multichannel
- frequency
- circuit
- pass filter
- filter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Measurement And Recording Of Electrical Phenomena And Electrical Characteristics Of The Living Body (AREA)
Abstract
The utility model discloses a novel electrocardio guardianship device, including multichannel electrocardio signal acquisition electrode, each collection electrode enlargies through multichannel buffer amplifier buffering, connects the selection circuit that leads, and the selection circuit that leads output connects gradually multichannel preamplifier, multichannel voltage amplifier, multichannel analog filter, multichannel AD converting circuit and MCU processing ware, is connected with collection electrode 0 on the MCU processing ware. The utility model discloses an install and acquire weak electrocardiosignal at the surperficial electrode of skin, enlarge through multichannel input buffer buffering, after the selection circuit that leads selects, enlarge by preamplifier, carry out the voltage amplification again and change through carrying out AD behind the analog filter filtering interference frequency, then it handles and the output display electrocardiosignal to carry out digital filtering through the singlechip, only need reset the software parameter to the service environment of difference can, greatly reduced medical equipment hardware complexity, reduction of auxiliary materials and reduction of product cost, the present invention has the advantages of reasonable.
Description
Technical field
This utility model relates to a kind of cardiac monitoring technical field, is specifically related to a kind of novel electrocardio-monitor system.
Background technology
Single-chip microcomputer is a kind of IC chip, adopt ultra-large technology having date processing as arithmetical operation, logical operations, data are transmitted, the microprocessor (CPU) of interrupt processing, random storage data storage (RAM), read-only program memory (ROM), imput output circuit (I/O mouth), also may comprise intervalometer, serial communication port (SCI), display driver circuit (LCD or LED drive circuit), pulse-width modulation circuit (PWM), the circuit such as analog multiplexer and A/D converter is integrated on a monolithic chip, form a minimum and perfect computer system.Along with the develop rapidly of computer and electronic information technology, single-chip microcomputer is also regenerated in continuous renewal, and becomes in electronic system and carry out data acquisition, information processing, the important devices that liaison and realizing controls.
Electrocardiosignal belongs to biomedicine signals, has following feature:
(1) signal has the feature of near-field detection, leaves the distance that people's body surface is small, just substantially can't detect signal;
(2) electrocardiosignal is usually fainter, is at most mV magnitude;
(3) belong to low frequency signal, and energy is mainly below hundreds of hertz;
(4) interference is strong especially.Disturb both from organism, as myoelectricity interference, respiration interference etc.; Also from vitro, as when Hz noise, picking up signal because of other alien cross-talks etc. that imperfect earth etc. is introduced;
(5) interfering signal and the own band overlapping of electrocardiosignal (as Hz noise etc.).
In Medical Instruments, utilize single-chip microcomputer as control unit, be widely used advanced technology.This technology, can make instrument more intelligent, and use more simple, function is more powerful, and performance is more stable.With the Medical Instruments that computer or single-chip microcomputer are core, already in each department of hospital, as radiology department, clinical laboratory, Nuclear Medicine Department, intensive care unit etc. are reused.Many state of an illness are comparatively light or be in the interior cardiac of convalescence, in the long term, all be unable to do without electrocardiogram monitor system, or the even originator of some heart diseases need long-term, and Continuous Observation EGC parameter, to catch the symptom that some occur instantaneously.Based on above-mentioned situation, develop a kind of portable domestic cardiac monitoring equipment, make patient also medical personnel can be allowed to carry out long distance monitoring to it by network at home, this one being undoubtedly current home medical market needs.
In view of above-mentioned prior art, the applicant has done useful design, and technical scheme described below produces under this background.
Utility model content
This utility model object is: provide a kind of accurate novel electrocardio-monitor.
The technical solution of the utility model is:
A kind of novel electrocardio-monitor, comprise multichannel ecg signal acquiring electrode, each acquisition electrode is through multichannel buffer amplifier Hyblid Buffer Amplifier, connect Conduction choice circuit, Conduction choice circuit exports and connects multichannel preamplifier, plurality of voltages amplifier, multi-channel analog wave filter, multi-channel A/D change-over circuit and processor of single chip computer successively, and processor of single chip computer is connected with display unit.
Preferably, described preamplifier circuit adopts common mode rejection ratio at the differential amplifier of more than 80dB, reduces the conversion of common mode disturbances to differential mode interference.
Preferably, described analog filter comprises the single order active high-pass filter, second-order low-pass filter and the band elimination filter that connect successively, wherein single order active high-pass filter and second-order low-pass filter composition band filter, the cut-off angular frequency of second-order low-pass filter is greater than the cut-off angular frequency of the active high-pass filtering circuit of single order, the passband that both cover provides a band-pass response, described band elimination filter adopts twin-T network to form, and suppresses 50Hz Hz noise.
Preferably, described multi-channel A/D change-over circuit adopts ADC0809, and processor of single chip computer adopts AT89C51, ADC0809 to be connected with AT89C51 system with inquiry mode, and adopts intervalometer T0 timing 4ms to interrupt, and carries out 250Hz sampling.
Preferably, the address that described ADC0809 utilizes AT89C51 to provide is locked in the frequency allowing signal ALE to obtain ALE foot after d type flip flop two divided-frequency, and its frequency is 1/6 of AT89C51 Singlechip clock frequency.
Preferably, described display unit adopts HS320240, for showing human body electrocardio oscillogram and heart rate data.
Preferably, described single order active high-pass filter comprises the RC wave filter be made up of electric capacity C and resistance R, RC wave filter exports the Voltage Series feedback amplifier connecting and be made up of integrated transporting discharging LM324 and some resistance, and the lower-cut-off frequency of single order active high-pass filter is set to 1HZ.
Preferably, the upper cut-off frequency of described second-order low-pass filter is 100HZ.
The utility model has the advantages that:
Novel electrocardio-monitor provided by the utility model, faint electrocardiosignal is obtained by the electrode being arranged on skin surface, through multichannel input buffer Hyblid Buffer Amplifier, after Conduction choice circuit is selected, amplified by preamplifier, carry out voltage amplification again to adapt to the amplitude requirement of A/D conversion, by carrying out A/D conversion after analog filter filtering interfering frequency, then carry out digital filtering process by single-chip microcomputer and export electrocardiosignal, digital filtering is used for electrocardiosignal de-noising, the performance of instrument and equipment can not only be improved, and for different environments for use (such as 50Hz or the 60Hz condition of power supply of country variant), only software parameter need be reset, greatly reduce armarium hardware complexity, reduce product cost, improve versatility.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, this utility model is further described:
Fig. 1 is the structure principle chart of novel electrocardio-monitor described in the utility model;
Fig. 2 is the circuit theory diagrams of the preamplifier of this utility model embodiment;
Fig. 3 is the circuit theory diagrams of the single order active high-pass filter of this utility model embodiment;
Fig. 4 is the circuit theory diagrams of the second-order low-pass filter of this utility model embodiment;
Fig. 5 is the circuit theory diagrams of the band elimination filter of this utility model embodiment;
Fig. 6,7 is the circuit theory diagrams of the multi-channel A/D change-over circuit of this utility model embodiment;
Fig. 8 is the circuit theory diagrams that the AT89C51 of this utility model embodiment is connected with liquid crystal display circuit.
Detailed description of the invention
Embodiment:
As shown in Figure 1, the novel electrocardio-monitor that this utility model discloses, comprise multichannel ecg signal acquiring electrode, each acquisition electrode is through multichannel buffer amplifier Hyblid Buffer Amplifier, connect Conduction choice circuit, Conduction choice circuit exports and connects multichannel preamplifier, plurality of voltages amplifier, multi-channel analog wave filter, multi-channel A/D change-over circuit and processor of single chip computer successively, and processor of single chip computer is connected with display unit.Electrocardiosignal is the faint low frequency Human Physiology signal of telecommunication, usual frequency is at 0.05 ~ 100Hz, amplitude is no more than 4mv, faint electrocardiosignal is obtained by the electrode being arranged on skin surface, through multichannel input buffer Hyblid Buffer Amplifier, after Conduction choice circuit is selected, amplified by pre-amplification circuit, carry out voltage amplification to adapt to the amplitude requirement of A/D conversion, by carrying out A/D conversion after analog filter filtering interfering frequency, then carry out digital filtering process by single-chip microcomputer and export electrocardiosignal, showing on the display unit.
As shown in Figure 2, be the circuit theory diagrams of preamplifier.Due to the feature of human ecg signal, add that background noise is stronger, impedance during acquired signal between electrode and skin is large and excursion is also larger, this just proposes higher requirement to prime (first order) amplifying circuit, namely requires that preamplifying circuit should meet following requirement: high input impedance; High cmrr; Low noise, low drifting, nonlinearity are little; Suitable frequency band and dynamic range.Wherein high input impedance is because the internal resistance of signal source is change.Comprising the contact resistance of electrode and skin, muscle, the internal resistance of the tissue such as skeleton.They not only have because of individual differences puts into change quite greatly.With regard to same person, also change with the difference of environment in time, excursion may between K Ω and M Ω.The small-signal of unstable internal resistance during the electrocardiosignal be extracted, in order to reduce the impact of signal on amplifier, must improve the input impedance of amplifier.Require that amplifier input impedance is at more than 1M Ω.High cmrr (CMRR) is because human body is as a conductor, and will receive the various interfering signals of external electromagnetic field, this signal is common-mode signal concerning amplifier.These interfering signals may be far longer than electrocardiosignal, and common mode disturbances may flood faint differential mode electrocardiosignal completely.Power supply Hz noise mainly occurs with common mode form, requires that preamplifier has higher common mode rejection ratio.Preamplifier circuit adopts the differential amplifier form of high cmrr, reduces the conversion of common mode disturbances to differential mode interference.The common mode rejection ratio of General Requirements amplifier is at more than 80dB.Low noise, low drifting is that require that amplifier noise is little as far as possible to effect of signals, low drifting characteristic, makes stable output signal, prevents amplifier saturation because electrocardiosignal is very faint.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 prime can not arrange too high, because forward gain is too high will be unfavorable for the process of subsequent conditioning circuit to noise.
Described analog filter comprises the single order active high-pass filter, second-order low-pass filter and the band elimination filter that connect successively, wherein single order active high-pass filter and second-order low-pass filter composition band filter, the cut-off angular frequency of second-order low-pass filter is greater than the cut-off angular frequency of the active high-pass filtering circuit of single order, the passband that both cover provides a band-pass response, described band elimination filter adopts twin-T network to form, and suppresses 50Hz Hz noise.
As shown in Figure 3, be the circuit theory diagrams of single order active high-pass filter.Single order active high-pass filter comprises the RC wave filter be made up of electric capacity C and resistance R, RC wave filter exports the Voltage Series feedback amplifier connecting and be made up of integrated transporting discharging LM324 and some resistance, electrocardiosignal most information concentrates between 0.05-100HZ, form electromagnetism owing to measuring to contact with human skin and produce DC voltage and affect, its amplitude be hundreds of millivolt not etc., add also there is certain potential difference between human body various piece, make ECG signal sampling input always there is the direct current signal of larger than electrocardiosignal tens times, maximumly reach 300mV.Design cut-off frequency is 1Hz, and setting this stage gain is 6, and homophase input single order high-pass filtering circuit cut-off frequency is: f=1/2 π RC=1Hz, as C=10 μ F, then R=1/2 π fC=15.923K; Actually get R=15.8K Ω.6 namely the gain of circuit is: A=1+R12/R11=6, R11 get 4.3K Ω, R12=5R11=22.5K Ω.C is phase compensation electric capacity.C=1/2 π fR12=7.23 μ F, gets 10 μ F.
As shown in Figure 4, be the circuit theory diagrams of second-order low-pass filter; In order to eliminate myoelectricity interference and the out-of-band radio-frequency component of useful signal, so devise second-order low-pass filter.The frequency of myoelectricity interference is generally more than hundreds of hertz.Homophase inputs two class's low-pass filter circuits, and fundamental relation is K=1+R28/R27; F0 is the cut-off frequency f0=100HZ of low-pass filtering.C3 span is 1-0.1uF, value 0.68uF.In the circuit, the gain of R13 and R14 on low-pass filter circuit does not affect, and has impact to the resonance angular frequency of this circuit.
As shown in Figure 5, be the circuit theory diagrams of band elimination filter.Although electrocardiosignal pre-amplification circuit has very strong inhibitory action to 50Hz Hz noise, be only inadequate by common mode inhibition, also need the special filter circuit of design to carry out filtering, simulation band elimination filter, is commonly called as wave trap.Most typical trap circuit is that passive twin-T network adds operational amplifier, and twin-T network is actual is the second order active band elimination filter become with high pass filter parallel combination by low pass, and two operational amplifiers are connected into be penetrated with state, and gain is all l.The circuit of the actual employing of native system is exactly the band elimination filter that this twin-T network is formed, and as shown in Figure 5, that operational amplifier is still selected is OP-07.R49=R52=R, C44=C45=C, C46, C35 parallel connection are 2C, R50, R51 parallel connection is R/2, if R53=R1, R54=R2, the transfer function of this circuit is:
In formula:
Regulate the ratio of R1, R2 can the value of control Q.Get C44=C45=C46=C35=0.068uF, R49=R50=R51=R52=47K, R53=R54=50K, by above formula
, Q=0.5, actual debug process shows, this circuit at about 20dB to the decay of 50Hz, has certain containment effect to Hz noise, but can not meet system requirements.
Shown in Fig. 6 and 7, be the circuit theory diagrams of multi-channel A/D change-over circuit.Described multi-channel A/D change-over circuit adopts ADC0809, and processor of single chip computer adopts AT89C51, ADC0809 to be connected with AT89C51 system with inquiry mode, and adopts intervalometer T0 timing 4ms to interrupt, and carries out 250Hz sampling.Due in ADC0809 sheet without clock, the address that ADC0809 utilizes AT89C51 to provide is locked in the frequency allowing signal ALE to obtain ALE foot after d type flip flop two divided-frequency, and its frequency is 1/6 of AT89C51 Singlechip clock frequency.If Singlechip clock frequency adopts 11.0592MHz, after two divided-frequency, meet the requirement of ADC0809 to clock frequency.Export tri-state latch because ADC0809 has, its 8 bit data output pin can directly be connected with data/address bus.Address decoding pin ADDA, ADDB, ADDC are connected with low three A0, A1, A2 of address bus respectively, and with a path in gating IN0 ~ IN7, this problem only uses a passage.Using P2.7 (address bus A15) as chip selection signal, when starting A/D conversion, started with conversion by the write signal of single-chip microcomputer and the address latch of P2.7 control ADC0809, because ALE and START connects together, therefore ADC0809 is while latch channel address, starts and changes.When reading transformation result, with low level read signal and P2.7 foot after one-level nor gate, produce positive pulse as OE signal in order to open tri-state latch, from Fig. 6,7, P2.7 should be set to low level, whether ADC0809 chip chooses the address of third channel to be 7FFBH, and completed by P3.2 mouth inquiry A/D conversion.
As shown in Figure 8, the circuit theory diagrams that are connected with liquid crystal display circuit of AT89C51.The S1D13305 that described display unit adopts HS320240, HS320240 using function powerful is as controller.One of be suitable for two kinds of time sequential routine circuit of intel8080 series and the serial MPU of mould 800, by hardware setting, both can selecting.4 video data lines, transmission data are rapid; There is powerful Plotting Function; Support text display, figure display and text mixed display; There is simple and direct MPU interface and multiple functional control instruction collection.COB technique is adopted to make, Stability Analysis of Structures, long service life.
Above-described embodiment, only for technical conceive of the present utility model and feature are described, its object is to person skilled in the art can be understood content of the present utility model and implement according to this, can not limit protection domain of the present utility model with this.All modifications done according to the spirit of this utility model main technical schemes, all should be encompassed within protection domain of the present utility model.
Claims (8)
1. a novel electrocardio-monitor, it is characterized in that: comprise multichannel ecg signal acquiring electrode, each acquisition electrode is through multichannel buffer amplifier Hyblid Buffer Amplifier, connect Conduction choice circuit, Conduction choice circuit exports and connects multichannel preamplifier, plurality of voltages amplifier, multi-channel analog wave filter, multi-channel A/D change-over circuit and processor of single chip computer successively, and processor of single chip computer is connected with display unit.
2. novel electrocardio-monitor according to claim 1, is characterized in that: described preamplifier circuit adopts common mode rejection ratio at the differential amplifier of more than 80dB, reduces the conversion of common mode disturbances to differential mode interference.
3. novel electrocardio-monitor according to claim 2, it is characterized in that: described analog filter comprises the single order active high-pass filter, second-order low-pass filter and the band elimination filter that connect successively, wherein single order active high-pass filter and second-order low-pass filter composition band filter, the cut-off angular frequency of second-order low-pass filter is greater than the cut-off angular frequency of the active high-pass filtering circuit of single order, the passband that both cover provides a band-pass response, described band elimination filter adopts twin-T network to form, and suppresses 50Hz Hz noise.
4. novel electrocardio-monitor according to claim 3, it is characterized in that: described multi-channel A/D change-over circuit adopts ADC0809, processor of single chip computer adopts AT89C51, ADC0809 is connected with AT89C51 system with inquiry mode, and adopt intervalometer T0 timing 4ms to interrupt, carry out 250Hz sampling.
5. novel electrocardio-monitor according to claim 4, it is characterized in that: the address that described ADC0809 utilizes AT89C51 to provide is locked in the frequency allowing signal ALE to obtain ALE foot after d type flip flop two divided-frequency, and its frequency is 1/6 of AT89C51 Singlechip clock frequency.
6. novel electrocardio-monitor according to claim 5, is characterized in that: described display unit adopts HS320240, for showing human body electrocardio oscillogram and heart rate data.
7. novel electrocardio-monitor according to claim 3, it is characterized in that: described single order active high-pass filter comprises the RC wave filter be made up of electric capacity C and resistance R, RC wave filter exports the Voltage Series feedback amplifier connecting and be made up of integrated transporting discharging LM324 and some resistance, and the lower-cut-off frequency of single order active high-pass filter is set to 1HZ.
8. novel electrocardio-monitor according to claim 3, is characterized in that: the upper cut-off frequency of described second-order low-pass filter is 100HZ.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520964215.5U CN205215213U (en) | 2015-11-30 | 2015-11-30 | Novel electrocardio guardianship device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520964215.5U CN205215213U (en) | 2015-11-30 | 2015-11-30 | Novel electrocardio guardianship device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205215213U true CN205215213U (en) | 2016-05-11 |
Family
ID=55890316
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520964215.5U Expired - Fee Related CN205215213U (en) | 2015-11-30 | 2015-11-30 | Novel electrocardio guardianship device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205215213U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105978533A (en) * | 2016-06-18 | 2016-09-28 | 南通尚青医疗科技有限公司 | Composite filter |
| CN111343914A (en) * | 2017-10-12 | 2020-06-26 | 先导者股份有限公司 | Hybrid signal processing circuit and method for implantable medical devices |
| CN111769564A (en) * | 2020-06-22 | 2020-10-13 | 中国舰船研究设计中心 | Active power filter and method for synthesizing differential mode and common mode output signals |
| CN114391855A (en) * | 2021-12-16 | 2022-04-26 | 光子集成(温州)创新研究院 | Multichannel optic nerve electric signal acquisition device |
-
2015
- 2015-11-30 CN CN201520964215.5U patent/CN205215213U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105978533A (en) * | 2016-06-18 | 2016-09-28 | 南通尚青医疗科技有限公司 | Composite filter |
| CN111343914A (en) * | 2017-10-12 | 2020-06-26 | 先导者股份有限公司 | Hybrid signal processing circuit and method for implantable medical devices |
| CN111343914B (en) * | 2017-10-12 | 2023-04-18 | 先导者股份有限公司 | Hybrid signal processing circuit and method for implantable medical devices |
| CN111769564A (en) * | 2020-06-22 | 2020-10-13 | 中国舰船研究设计中心 | Active power filter and method for synthesizing differential mode and common mode output signals |
| CN111769564B (en) * | 2020-06-22 | 2021-11-09 | 中国舰船研究设计中心 | Active power filter and method for synthesizing differential mode and common mode output signals |
| CN114391855A (en) * | 2021-12-16 | 2022-04-26 | 光子集成(温州)创新研究院 | Multichannel optic nerve electric signal acquisition device |
| CN114391855B (en) * | 2021-12-16 | 2024-06-21 | 光子集成(温州)创新研究院 | Multichannel optic nerve electric signal acquisition device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104363824B (en) | The measurement of real-time QRS duration in electrocardiogram | |
| CN205215213U (en) | Novel electrocardio guardianship device | |
| CN103027675B (en) | Novel portable three-lead real-time wireless electrocardiogram monitoring system and analyzing method | |
| CN104545901A (en) | Electroencephalogram detecting system | |
| CN101422362A (en) | Wireless cardiac bioelectricity monitoring system with motion artifact elimination function | |
| CN104188683A (en) | Multifunctional intelligent stethoscope capable of displaying, storing and transmitting electrocardiograph signals | |
| CN106214147A (en) | A kind of wearable monitor device | |
| Morales et al. | An application of reconfigurable technologies for non-invasive fetal heart rate extraction | |
| CN104799849A (en) | Portable sleep apnea syndrome monitoring method and device | |
| CN103371814A (en) | Remote wireless electrocardiograph monitoring system and feature extraction method on basis of intelligent diagnosis | |
| CN201542630U (en) | Novel electrocardio-recorder | |
| CN204520670U (en) | A kind of electrocardiogram monitor system based on Internet of Things | |
| CN104510461A (en) | Digital full-isolation electrocardiosignal acquisition and noise reduction device and method thereof | |
| CN203776891U (en) | Mobile electrocardiogram monitoring system based on Bluetooth 4.0 BLE | |
| CN204181639U (en) | A kind of Multifunctional smart stethoscope showing, store and transmit electrocardiosignal | |
| CN106344003A (en) | Multifunctional auxiliary electrocardiogram monitoring device | |
| CN205386149U (en) | Portable electrocardio of integrated and skin electricity monitor | |
| CN202761271U (en) | Amplifying circuit for electrocardiogram (ECG) detection | |
| CN201912078U (en) | Electrocardiogram machine for synchronously outputting electrocardio and electrocardial vector | |
| CN201267470Y (en) | 12-channel digital electrocardiosignal acquisition module | |
| CN203828923U (en) | Electrocardiogram monitoring system based on wireless communication | |
| CN103690159A (en) | Portable cardiogram monitor | |
| Li et al. | A Wearable EEG Real-time Measure and Analysis Platform for Home Applications | |
| CN206166917U (en) | Anesthesia monitor data acquisition device | |
| Han et al. | The design of ECG preamplifier for wearable device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160511 Termination date: 20181130 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |