CN106725438A - Without conducting wire standard cardioelectric patient monitor - Google Patents
Without conducting wire standard cardioelectric patient monitor Download PDFInfo
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- CN106725438A CN106725438A CN201710000941.9A CN201710000941A CN106725438A CN 106725438 A CN106725438 A CN 106725438A CN 201710000941 A CN201710000941 A CN 201710000941A CN 106725438 A CN106725438 A CN 106725438A
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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]
- A61B5/319—Circuits for simulating ECG signals
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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
- A61B5/30—Input circuits therefor
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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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Abstract
The present invention relates to one kind without conducting wire standard cardioelectric patient monitor, it is characterized in that, the ECG monitor includes main frame electrode, ordinary electrode and display device, it is transmitted by wireless transmission method between the main frame electrode and ordinary electrode and between main frame electrode and display device, the main motor connects one or more ordinary electrode by wireless transmission method.The technical scheme is wirelessly transmitted to main frame by the signal of electrode detection, without conducting wire standard cardioelectric patient monitor, the signal of electrode detection is wirelessly transmitted to main frame, main frame is also wirelessly to be transmitted to display device again, whole process without wire, this ensure that while experience very well, moreover it is possible to constitute various standard leads, standard cardioelectric figure is measured, the diagnosis effect equal with conventional criteria lead is obtained.
Description
Technical field
The present invention relates to a kind of patient monitor, and in particular to one kind belongs to medicine equipment without conducting wire standard cardioelectric patient monitor
Equipment technical field.
Background technology
Patient monitor is usually to electrocardio, breathing, blood pressure, blood oxygen saturation, pulse frequency, body temperature, End-tidal carbon dioxide, breathing
Mechanics, anesthetic gases, cardiac output, BIS Propofol-targeted etc. are monitored, and are the indispensable medicine equipments of hospital and family
One of equipment.
The generation of human ecg signal：Tissue and body fluid around heart can be conductive, therefore it is one that can regard human body as
The individual volume conductor with length and width, thick three-dimensional space.Heart cans be compared to power supply, the summation of countless Single Cardiac Cell changes
Can conduct and reflect body surface.Potential difference is there is between body surface is much put, also being had between much put without potential difference
It is to wait electricity.Heart is in succession excited by pacemaker, atrium, ventricle in each cardiac cycle, along with bioelectric change,
These bioelectric changes are referred to as electrocardio.
The characteristics of human ecg signal：Electrocardiosignal belongs to biomedicine signals, with following features：
(1) the characteristics of signal has near-field detection, leaves the small distance of people's body surface, just substantially can't detect signal；
(2) electrocardiosignal is generally fainter, is at most mV magnitudes；
(3) low frequency signal is belonged to, and energy is main below hundreds of hertz；
(4) disturb especially strong.Interference was both come from organism, such as myoelectricity interference, respiration interference；Also organism is come from
Outward, such as Hz noise, picking up signal when because of other alien cross-talks etc. of imperfect earth introducing；
(5) interference signal and electrocardiosignal band overlapping (such as Hz noise) in itself.
The research of electrocardiosignal：Electrocardiosignal is that the mankind study and are applied to one of bio signal of clinical medicine earliest,
It is more easily detected than other bioelectrical signals, and is promoted with more intuitively regularity, thus ecg analysis technology
The development of medical science.Electrocardioscopy is the important method of clinically diagnosis of cardiovascular diseases.Electrocardiogram it is accurate automatically analyze with
The effect that key is played for angiocardiopathy is diagnosed, is also the problem that domestic and foreign scholars are keen to.
The inspection meaning of electrocardiosignal：For to various arrhythmia cordis, ventricular atrial hypertrophy, myocardial infarction, arrhythmia cordis,
The illness inspection such as myocardial ischemia.Electrocardiogram is the electrical activity process for reflecting cardiac excitation, and it is to heart basic function and its pathology
Research aspect, with important reference value.The inspection of electrocardiogram must combine many indexes and clinical data, carry out comprehensively comprehensive
Analysis is closed, correct judgement could be made to the functional structure of heart.
Electrocardiosignal is constituted substantially：Electrocardiosignal is made up of P, QRS, T ripple and quiescent stage, such as Fig. 1, and each ripple has different
Frequency characteristic is a kind of typically with the special biomedicine signals claimed with time-scale feature of obvious time-frequency.
The phase has all reacted the change of the function of heart to some extent between P.QRS.T ripples and PR, ST, QT, therefore passes through
Algorithm is realized having turned into a popular research direction of comparing to the differentiation that automatically analyzes of cardiac function.
The extraction of electrocardiosignal：Biomedicine signals belong to the low-frequency weak signal under strong noise background, are by complicated
The unstable natural sign that life entity sends.Each physiological parameter for example the bioelectrical signals body temperature such as electrocardio, brain electricity, myoelectricity, blood pressure,
The non-electrical signals such as temperature, pressure flow, power, the displacement of breathing, CBF, pulse, heart sound etc., from signal in itself feature to extraction
Mode is all different from the situation in Industrial Engineering, with its particularity.It is extremely complex life system as the human body of signal source
Unite the extraction and treatment of human-body biological medical signals, be important in natural science field.The bio-electric phenomenon of human body leads to
Cross electrode to be picked up using certain lead mode, the various sensor transformations of each non-electrical parameter are into being picked after electric signal.
The shape that electrode form has the external electrodes such as skin surface electrodes external electrode, needle electrode, microelectrode much has for limbs
Plate electrodes, with adhesive plaster paste rosette electrode, suction cup electrode, float type surface electrode, press-button type electrode with
And the surface electrode earclip type electrode of special shape etc..So-called polarization of electrode refers to that electrode is formed with electrolyte solution interface
Polarization voltage is produced in electric double layer and the change that electrode and electrolyte solution phase boundary potential occur when there is electric current to pass through.By letter
The interference that number process circuit removes primary signal obtains the bio signal (Primary signal) of primary again by various computings
Obtain reflecting the signal (Secondary signal) of organ functional character.Biological electricity leading electrode actually accomplish human body and
Interface interaction between measuring system.In order to leading electrode must possess electric current during bioelectrical signals are introduced into signal processing module
Conducting power.Electric current is electronic conduction by ionic conduction in test system in human body.By leading electrode ion
Electric current is changed into electronics electricity so electrode has actually played a transducer.
It is divided into Double-electrode type and the major class product of multi-electrode standard lead formula two in the market.Double-electrode type is by detecting body
The voltage difference that 2 points of body calculates electrocardiogram, and two electrode spacings are short, can be not required to lead, compact, convenient to wear, convenience
Very well, but draw be not standard lead electrocardiogram, diagnosis reference value it is low.The electrocardiogram that multi-electrode standard lead formula draws
Can be matched with java standard library, with diagnosis reference value very high, but each electrode is drawn by wire, wear trouble, experience ratio
It is poor, therefore, a kind of new technical scheme of exigence solves the problem.
The content of the invention
The present invention is just being directed to the technical problem for existing in the prior art, there is provided a kind of without the monitoring of conducting wire standard cardioelectric
Instrument, the technical scheme is wirelessly transmitted to main frame by the signal of electrode detection, without conducting wire standard cardioelectric patient monitor, electricity
The signal of pole detection is wirelessly transmitted to main frame, and main frame is also wirelessly to be transmitted to display device again, and whole process need not
Wire, this ensure that while experience very well, moreover it is possible to constitute various standard leads, measures standard cardioelectric figure, obtains and routine
The equal diagnosis effect of standard lead.
To achieve these goals, technical scheme is as follows, and one kind is without conducting wire standard cardioelectric patient monitor, and it is special
Levy and be, the ECG monitor includes main frame electrode, ordinary electrode and display device, the main frame electrode and ordinary electrode
Between and main frame electrode and display device between be transmitted by wireless transmission method, the main frame electrode is by wireless biography
Defeated mode connects one or more ordinary electrode.
As a modification of the present invention, the wireless transmission method in the following ways in one kind, high frequency radio,
Infrared light-wave, sound wave, (audio, ultrasonic wave etc.)；Wherein high frequency radio include bluetooth, wife, 2.4ghz, 868mhz,
Other radio protocols such as 433mhz, 315mhz, standard, frequency, the sound wave includes audio, ultrasonic wave, the ordinary electrode
Including electrode slice, pre-amplification circuit, high-pass filtering circuit, main amplifying circuit, low-pass filter circuit and radio transmitter,
The electrode slice connects high-pass filtering circuit by pre-amplification circuit, and high-pass filtering circuit connects low pass by main amplifying circuit
Filter circuit and radio transmitter.
Used as a modification of the present invention, the main frame electrode includes RL electrodes, RL electrode slices, electrode, gain control electricity
Road, MCU, Bluetooth circuit and wireless receiving circuit, the RL electrode slices are affixed on human body surface, and wireless receiving circuit passes through gain
Control circuit connection electrode, electrode passes the signal to display device by MCU and Bluetooth circuit.
Used as a modification of the present invention, the ordinary electrode power circuit includes resistance R1, resistance R2, switch S1, fortune
Calculate amplifier U1A electric capacity C11 and electric capacity C1, wherein electric capacity C1, resistance R1, resistance R2 and electric capacity C11 composition peripheral circuit, electricity
Pond provides power to each circuit by the laggard filtering of switch S1, and peripheral circuit and operational amplifier U1A are formed virtually.With two
/ mono- vdd voltage (Vref) conduct is virtually supplied to each operational amplification circuit.
Used as a modification of the present invention, the electrode slice and head preamplifier circuit include resistance R5, electric capacity C12 and fortune
Amplifier U1B is calculated, wherein operational amplifier U1B composition voltage followers, the signal that electrode slice is detected passes through RC passive filterings
Being sent to U1B voltage followers carries out impedance conversion, amplifies driving force.Because electrocardiosignal is excessively faint.
Used as a modification of the present invention, the high-pass filtering amplifying circuit includes resistance R8, resistance R9, resistance R10, electricity
Resistance R13, electric capacity C6, electric capacity C7 and operational amplifier U1C, wherein resistance R8, resistance R9, resistance R10, resistance R13, electric capacity
C6, electric capacity C7 form peripheral cell, the operational amplifier U1C and peripheral cell composition second order active high-pass filtering circuit, filter
Except the interference signal of low frequency part.
Used as a modification of the present invention, the main amplifying circuit includes resistance R4, resistance R7 and operational amplifier U1D,
Wherein resistance R4, resistance R7 and operational amplifier U1D composition reverse amplification circuits, multiplication factor is R7/R4.
As a modification of the present invention, the LPF amplifying circuit include resistance R12, resistance R6, resistance R14,
Resistance R11, electric capacity C4, electric capacity C5 and operational amplifier U2B, wherein resistance R12, resistance R6, resistance R14, resistance R11, electricity
Hold C4 and electric capacity C5 composition peripheral cells, the operational amplifier U2B and peripheral cell composition second order active LPF electricity
Road, filters the interference signal of HFS.
As a modification of the present invention, the radio transmitter include resistance R3, operational amplifier U2C, electric capacity C3,
Resistance R5, SAW filter Y1, triode Q1, crystal oscillator swing L1, electric capacity C9, electric capacity C8, electric capacity C10 and resistance R16, described
Operational amplifier U2C forms voltage follower, and electric capacity C3, resistance R5, SAW filter Y1, triode Q1, crystal oscillator swing L1, electricity
Hold C9, electric capacity C8, electric capacity C10 and resistance R16 and form capacitance three-point type high frequency radio transmitter, signal first passes through U2C shapes
Into voltage follower, carry out impedance conversion lifting driving force, be then delivered to capacitance three-point type high frequency radio transmitter will
Signal is launched.Employ sound surface and filter filter Y so that frequency is more stable, it is not easy to drift occur.Each ordinary electrode is adopted
With different tranmitting frequencies to distinguish, the principle of whole circuit is completely the same.Different ordinary electrodes only need to be in radiating circuit portion
Divide the SAW filter and adjustment matching element for using different frequency instead.
Used as a modification of the present invention, the gain control circuit includes resistance R17, resistance R18, the operation amplifier
Device U5C, resistance R19, resistance R20, electric capacity C13, electric capacity C17 and triode Q2, the resistance R17, resistance R18, resistance
R19, resistance R20, electric capacity C13, electric capacity C17 and triode Q2 composition peripheral circuit, wherein operational amplifier U5C and periphery electricity
Road constitutes gain control circuit.The signal input for receiving first is considered and removes high frequency spurs to operational amplifier U5C, makes signal more dry
Only, MUC output AGC signals control gain, to make up signal by the amplitude offset of generation after above various processing of circuit and adjust
The whole signal to be adapted to analog front-end chip.
Used as a modification of the present invention, the power circuit of the main frame electrode uses TPS61220DCK chips, the nothing
Line receiving circuit uses MICRF007 chips.
Relative to prior art, the invention has the advantages that, 1) the technical scheme global design is ingenious, compact conformation；
2) signal of electrode detection is wirelessly transmitted to main frame in the technical scheme, main frame be also wirelessly be transmitted to again it is aobvious
Show equipment, whole process, this ensure that while experience very well, moreover it is possible to constitute various standard leads, measures the standard heart without wire
Electrograph, obtains the diagnosis effect equal with conventional criteria lead.On RL positions for main machine electrode remaining be ordinary electrode, it is each general
Each then electrocardiosignal is wirelessly transmitted to main frame electrode to logical electrode detection；Main frame electrode detection RL signals, receive general
The signal that energization pole sends together is sent into electrocardio computing chip and is analyzed, and display is finally transmitted in the way of wireless blue tooth sets
It is standby, ensure that measurement effect while improving experience；3) technical scheme is truly realized and is wirelessly transferred, what electrode slice was detected
Signal is wirelessly to be transmitted to main frame, and main frame is wirelessly transmitted to display device, and it is convenient to operate with.
Brief description of the drawings
Fig. 1 is typical cardiac electrical signal waveforms；
Fig. 2 is present invention entirety composition schematic diagram；
Fig. 3 is ordinary electrode schematic diagram；
Fig. 4 is main machine electrode schematic diagram；
Fig. 5 is ordinary electrode power circuit schematic diagram；
Fig. 6 is electrode slice and pre-amplification circuit schematic diagram；
Fig. 7 is high-pass filtering amplifying circuit；
Fig. 8 is main amplifying circuit schematic diagram；
Fig. 9 is LPF amplifying circuit schematic diagram；
Figure 10 is radio transmitter schematic diagram；
Figure 11 is wireless receiving circuit schematic diagram；
Figure 12 is gain control circuit schematic diagram；
Figure 13 is main machine electrode power circuit diagram；
Figure 14 is EGC analog front end and peripheral circuit diagram；
Figure 15 is the connection diagram of ADS1293 internal structures and external pin；
Figure 16 is main motor position view when using；
Figure 17 is display device schematic diagram；
Specific embodiment：
In order to deepen the understanding of the present invention, the present embodiment is described in detail below in conjunction with the accompanying drawings.
Embodiment 1：Referring to Fig. 2, a kind of without conducting wire standard cardioelectric patient monitor, the ECG monitor includes main frame electricity
Pole, ordinary electrode and display device, between the main frame electrode and ordinary electrode and between main frame electrode and display device
It is transmitted by wireless transmission method, the main frame electrode connects one or more common electricity by wireless transmission method
Pole；The wireless transmission method in the following ways in one kind, high frequency radio, infrared light-wave, sound wave, (audio, ultrasound
Ripple etc.)；Wherein high frequency radio includes other radio such as bluetooth, wife, 2.4ghz, 868mhz, 433mhz, 315mhz association
View, standard, frequency, the sound wave include audio, ultrasonic wave, referring to Fig. 3, the ordinary electrode include electrode slice, preposition amplification
Circuit, high-pass filtering circuit, main amplifying circuit, low-pass filter circuit and radio transmitter, the electrode slice is by preposition
Amplifying circuit connects high-pass filtering circuit, and high-pass filtering circuit connects low-pass filter circuit and wireless hair by main amplifying circuit
Transmit-receive radio road.
Referring to Fig. 4, the main frame electrode includes RL electrode slices, several wireless receiving circuits, gain control circuit, electrocardio
Signal imitation front-end circuit, MCU+ Bluetooth circuits, the RL electrode slices are affixed on human body surface, and wireless receiving circuit passes through gain control
Circuit connection electrode processed, electrocardiosignal analog front circuit connection MCU and Bluetooth circuit pass the signal to display device.
Referring to Fig. 5, the ordinary electrode power circuit includes resistance R1, resistance R2, switch S1, operational amplifier U1A electricity
Hold C11 and electric capacity C1, wherein electric capacity C1, resistance R1, resistance R2 and electric capacity C11 composition peripheral circuit, battery pass through switch S1
Laggard filtering provides power to each circuit, and peripheral circuit and operational amplifier U1A are formed virtually.With 1/2nd VDD electricity
Pressure (Vref) conduct is virtually supplied to each operational amplification circuit.
Referring to Fig. 6, the electrode slice and head preamplifier circuit include resistance R5, electric capacity C12 and operational amplifier U1B,
Wherein operational amplifier U1B constitute voltage follower, the signal that electrode slice is detected by RC passive filterings be sent to U1B voltages with
Impedance conversion is carried out with device, amplifies driving force.Because electrocardiosignal is excessively faint.
Referring to Fig. 7, the high-pass filtering amplifying circuit include resistance R8, resistance R9, resistance R10, resistance R13, electric capacity C6,
Electric capacity C7 and operational amplifier U1C, wherein resistance R8, resistance R9, resistance R10, resistance R13, electric capacity C6, electric capacity C7 form outer
Element, the operational amplifier U1C and peripheral cell composition second order active high-pass filtering circuit are enclosed, the interference of low frequency part is filtered
Signal.
Referring to Fig. 8, the main amplifying circuit includes resistance R4, resistance R7 and operational amplifier U1D, wherein resistance R4, electricity
Resistance R7 and operational amplifier U1D composition reverse amplification circuits, multiplication factor is R7/R4.
Referring to Fig. 9, the LPF amplifying circuit includes resistance R12, resistance R6, resistance R14, resistance R11, electric capacity
C4, electric capacity C5 and operational amplifier U2B, wherein resistance R12, resistance R6, resistance R14, resistance R11, electric capacity C4 and electric capacity
C5 constitutes peripheral cell, the operational amplifier U2B and peripheral cell composition second order active low-pass filter circuit, filters radio-frequency head
The interference signal divided.
Referring to Figure 10, the radio transmitter includes resistance R3, operational amplifier U2C, electric capacity C3, resistance R5, sound table
Face wave filter Y1, triode Q1, crystal oscillator swing L1, electric capacity C9, electric capacity C8, electric capacity C10 and resistance R16, the operational amplifier
U2C forms voltage follower, and electric capacity C3, resistance R5, SAW filter Y1, triode Q1, crystal oscillator swing L1, electric capacity C9, electric capacity
C8, electric capacity C10 and resistance R16 form capacitance three-point type high frequency radio transmitter, signal first pass through the voltage of U2C formation with
With device, impedance conversion lifting driving force is carried out, be then delivered to capacitance three-point type high frequency radio transmitter and launch signal
Go.Employ sound surface and filter filter Y so that frequency is more stable, it is not easy to drift occur.Each ordinary electrode uses different hairs
Radio frequency rate is to distinguish, and the principle of whole circuit is completely the same.Different ordinary electrodes only need to use difference instead in radiating circuit part
The SAW filter and adjustment matching element of frequency.
Referring to Figure 13, main frame electrode supply circuit diagram, using the DCDC boosting voltage stabilizing IC of TI (Texas Instrument) company, model
For：TPS61220DCK, for each circuit provides power supply supply.TPS61220 is the low input electricity of a quiescent current with 5.5mA
Pressure, 0.7V boost converters.TPS61220 is encapsulated using 6 pin SC-70, can under low load conditions keep high efficiency.
The battery of the design of microprocessor of the system based on low-power consumption can further be extended.In 5V output voltages
When, output current is up to 50mA, and the lithium ion battery discharge voltage of system is less than 2.5V.
The wireless receiving circuit part below figure 11 of each electrode, circuit is with MICRF007 as core.MICRF007 is
Monolithic UHF ASK/OOK (on-off keying) super-heterodyne radio that Micrel companies release receives chip.MICRF007 is adopted
Encapsulated with SOP (M) -8, core on-chip circuit can be divided into UHF downconverters, OOK demodulators and benchmark and control three parts.Become under UHF
Parallel operation includes RF amplifiers, frequency mixer, intermediate frequency amplifier, bandpass filter, peak detector, synthesizer, AGC control circuits；
OOK demodulators include low pass filter, comparator；Reference control circuit includes reference oscillator and control logic circuit, it is only necessary to
External 2 capacitors CAGC and CTH, 1 crystal oscillator and power supply coupling capacitor are that may make up 1 UHF ASK receiver, all of
RF and IF tunings are all automatically performed in chip, are a monolithic devices of real " being wirelessly input to-data output ".Each electrode
Receiving circuit need to only change different crystal oscillators and change receives frequencies, corresponding with each emission electrode to go up, the chip and electricity for using
Road principle is completely the same.Referring to Figure 12, the gain control circuit includes resistance R17, resistance R18, the operational amplifier
U5C, resistance R19, resistance R20, electric capacity C13, electric capacity C17 and triode Q2, the resistance R17, resistance R18, resistance R19,
Resistance R20, electric capacity C13, electric capacity C17 and triode Q2 composition peripheral circuit, wherein operational amplifier U5C and peripheral circuit group
Into gain control circuit.The signal input for receiving first is considered and removes high frequency spurs to operational amplifier U5C, makes signal cleaner,
MUC output AGC signal control gains, to make up signal by the amplitude offset of generation after above various processing of circuit and be adjusted to
It is adapted to the signal of analog front-end chip.
Referring to Figure 14 EGC analogs front end and peripheral circuit diagram, the professional electrocardio of TI companies ADS129X series is used
AFE(analog front end), ADS1291--ADS1298 is mainly the different of electrode number, and different chips is used according to demand.Now with
ADS1293 chips are designed as introducing.ADS1293 is 3 passages, 24 that TIX (TI) is used for biopotential measurement
Position integrated simulation front end, can set for specific sample rate and bandwidth to each passage, allow users to specific aim
Can be distributed rationally with power consumption, also there is alternating current-direct current burn out detection (Lead_offDetect), battery electric quantity to monitor and self for it
The functions such as diagnostic alarms, the driven-right-leg circuit needed for being built-in with ECG applications rents Wilson/Goldberger terminals.ADS1293
Internal structure is as shown in figure 15 with the connected mode of external pin, and signal input interface, signal can be divided into from the flow direction of signal
The part such as processing unit and signal output interface.
(1) signal input interface.Signal input pin has 6 from IN1~IN6, fully enters pin all comprising one
Electromagnetic interference (EMI) filter to be filtering radio noise.System using 5 lead connected modes, i.e. right arm (RA), left arm (LA) and
Left leg (LL) is connected respectively to IN1, IN2 and IN3 pin；Common mode detector (CMdetect) obtains the average electricity of RA, LA and LL
Input of the pressure as right leg drive (RLD) amplifier, the output of right leg drive amplifier again returns to right leg (RL) end, together from
IN4 pins are input into.The effect of driven-right-leg circuit is the common mode level for controlling patient, the exchange rejection ratio of lifting system；Weir
The output of inferior network (WCT) is connected to IN6 pins, with differences of the V1 (chest electrode) together as CH3 passages for being connected to IN5 pins
Sub-signal is input into.
(2) signal processing unit.Mainly by instrumentation amplifier (INA), ∑ △ adjusters (SDM) and lowpass digital filter
(DigitalFilter) 3 parts composition, Main Function is that difference analogue voltage signal is converted into data signal.Instrument amplifies
Device is one has the operational amplification circuit of high input impedance, mainly there is two effects：1) certain amplification is played to differential signal
Effect.2) high input impedance is provided, to obtain bigger input signal from ECG electrode.The output signal of instrumentation amplifier is sent
Entering ∑ △ modulators carries out analog/digital conversion, and ∑ △ modulators are a coding techniques based on over-sampling, and output reflects input
One encoded data stream of signal amplitude.Lowpass digital filter is made up of 3 programmable 5 rank sin mode filters, and ∑ △ is adjusted
After the output of device processed is processed by lowpass digital filter, you can obtain N coding output.
(3) signal output interface.Mainly include 4 line SPI serial line interfaces, DRDYB pins and ALRAM pins.Each pin
Function is as follows：SCLK is serial clock input pin；SDI be serial date transfer pin, totally 16, wherein, 1 read-write control
System, 7 bit address and 8 data.During rising edge clock, all data are sampled and are write in the 16th rising edge clock
In entering register.SDO is serial data output pin, and in 8~15 clock falling edges, SDO pins read data.CSB is selected for piece
Pin, Low level effective, SPI interface starts to read and write data between low period, and low level maintains 16 clock cycle；DRDYB
For analog-to-digital conversion terminates pin, represent that the data of chip internal are ready for reading, Low level effective generally can be used as
The interrupt signal or status inquiry signal of CPU；ALARMB is alarm pin, and ADS1293 has an OBD warning system, uses
In the abnormal conditions that diagnosis may occur in ECG applications, these abnormal conditions mainly include electrode delamination, timing error, low
Electricity warning and 3 channels operations are abnormal etc., once there are abnormal conditions to be reported to error flag, and on ARLAM pins
Display.
MCU and Bluetooth transmission circuit, the signal that electrocardiosignal analog front circuit is collected are sent to by the circuit
On terminal device.The circuit is with the CC2541 of TI companies as core.CC2541 is by the outstanding performance of leading RF transceivers and one
The enhanced 8051MCU of industrywide standard, In-System Programmable flash memories, 8KB RAM and many other powerful spies
Property and peripheral hardware are combined；The system that CC2541 is highly suitable to be applied for needing super low energy consumption, this is by various different operations
Pattern is specified.Shorter conversion time further reduces energy consumption between operational mode.CC2541 embeds 8051 cores, and electrocardio is sent
Data signal after module is encoded is received with SPI protocol, is processed, then sent by RF.
Operation principle：
Referring to Figure 16,17, when using, display device (mobile phone, computer etc.) is installed into corresponding APP (application program) in advance,
The subsidiary APP CDs of product are downloaded to company's site；Electrode slice is sticked in the corresponding position of body with standard according to demand, by phase
Corresponding ordinary electrode and main frame electrode are anchored on electrode slice, it is ensured that contact is good, and opens each electrode switch, main frame electrode
Matched with display device, set up connection, operate display device, show electrocardiogram, carry out cardiac monitoring without any lead, perfectly
Detection experience, finally obtains the electrocardiogram of standard.
It should be noted that above-described embodiment, not for limiting protection scope of the present invention, in above-mentioned technical proposal
On the basis of done equivalents or replacement each fall within the scope that the claims in the present invention are protected.
Claims (10)
1. one kind is without conducting wire standard cardioelectric patient monitor, it is characterised in that the ECG monitor includes main frame electrode, common electricity
Pole and display device, pass between the main frame electrode and ordinary electrode and by wireless between main frame electrode and display device
Defeated mode is transmitted, and the main frame electrode connects one or more ordinary electrode by wireless transmission method.
2. it is according to claim 1 without conducting wire standard cardioelectric patient monitor, it is characterised in that the wireless transmission method is adopted
One kind in the following methods, high frequency radio, infrared light-wave, sound wave, (audio, ultrasonic wave etc.)；Wherein high frequency radio
Including other radio protocols such as bluetooth, wife, 2.4ghz, 868mhz, 433mhz, 315mhz, standard, frequency, the sound wave
Including audio, ultrasonic wave, the ordinary electrode include electrode slice, pre-amplification circuit, high-pass filtering circuit, main amplifying circuit,
Low-pass filter circuit and radio transmitter, the electrode slice connect high-pass filtering circuit, high pass by pre-amplification circuit
Filter circuit connects low-pass filter circuit and radio transmitter by main amplifying circuit.
3. it is according to claim 2 without conducting wire standard cardioelectric patient monitor, it is characterised in that the main frame electrode includes RL
Electrode slice, several wireless receiving circuits, gain control circuit, electrocardiosignal analog front circuit, MCU+ Bluetooth circuits, it is described
RL electrode slices are affixed on human body surface, and wireless receiving circuit connects electrocardiosignal analog front circuit, the heart by gain control circuit
Electrical signal simulation front-end circuit passes the signal to display device by MCU and Bluetooth circuit.
4. according to Claims 2 or 3 without conducting wire standard cardioelectric patient monitor, it is characterised in that ordinary electrode electricity
Source circuit includes battery BT1, resistance R1, resistance R2, switch S1, operational amplifier U1A electric capacity C11 and electric capacity C；Wherein computing
Amplifier U1A and peripheral cell electric capacity C1, resistance R1, resistance R2 and electric capacity C11 constitute virtually circuit, and battery is by switch S1
Laggard filtering provides power to each circuit, and virtually circuit produces a virtual earth signal, used as each operational amplification circuit
Datum.
5. it is according to claim 4 without conducting wire standard cardioelectric patient monitor, it is characterised in that the electrode slice and preceding storing
Big circuit includes resistance R5, electric capacity C12 and operational amplifier U1B, wherein operational amplifier U1B composition voltage followers, electricity
The signal that pole piece is detected is sent to U1B voltage followers and carries out impedance conversion by RC passive filterings, amplifies driving force.
6. it is according to claim 5 without conducting wire standard cardioelectric patient monitor, it is characterised in that electricity is amplified in the high-pass filtering
Road includes resistance R8, resistance R9, resistance R10, resistance R13, electric capacity C6, electric capacity C7 and operational amplifier U1C, wherein resistance
R8, resistance R9, resistance R10, resistance R13, electric capacity C6, electric capacity C7 are peripheral cell, the operational amplifier U1C and peripheral cell
Composition second order active high-pass filtering circuit, filters the interference signal of low frequency part.
7. it is according to claim 6 without conducting wire standard cardioelectric patient monitor, it is characterised in that the main amplifying circuit includes
Resistance R4, resistance R7 and operational amplifier U1D, wherein resistance R4, resistance R7 and operational amplifier U1D compositions reversely amplify electricity
Road, multiplication factor is R7/R4.
8. it is according to claim 7 without conducting wire standard cardioelectric patient monitor, it is characterised in that the LPF amplifies electricity
Road includes resistance R12, resistance R6, resistance R14, resistance R11, electric capacity C4, electric capacity C5 and operational amplifier U2B, wherein resistance
R12, resistance R6, resistance R14, resistance R11, electric capacity C4 and electric capacity C5 composition peripheral cell, the operational amplifier U2B and outer
Element composition second order active low-pass filter circuit is enclosed, the interference signal of HFS is filtered.
9. it is according to claim 8 without conducting wire standard cardioelectric patient monitor, it is characterised in that the radio transmitter bag
Include resistance R3, operational amplifier U2C, electric capacity C3, resistance R5, SAW filter Y1, triode Q1, crystal oscillator swing L1, electric capacity C9,
Electric capacity C8, electric capacity C10 and resistance R16, the operational amplifier U2C form voltage follower, electric capacity C3, resistance R5, sound table
Face wave filter Y1, triode Q1, crystal oscillator swing L1, electric capacity C9, electric capacity C8, electric capacity C10 and resistance R16, and to form capacitance three-point type high
Frequency radio transmitter, signal first passes through the voltage follower of U2C formation, carries out impedance conversion lifting driving force, then send
Signal is launched to capacitance three-point type high frequency radio transmitter.
10. it is according to claim 9 without conducting wire standard cardioelectric patient monitor, it is characterised in that the gain control circuit
Including resistance R17, resistance R18, the operational amplifier U5C, resistance R19, resistance R20, electric capacity C13, electric capacity C17 and three poles
Pipe Q2, the resistance R17, resistance R18, resistance R19, resistance R20, electric capacity C13, electric capacity C17 and triode Q2 compositions periphery
Circuit, wherein operational amplifier U5C and peripheral circuit constitute gain control circuit.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710000941.9A CN106725438A (en) | 2017-01-03 | 2017-01-03 | Without conducting wire standard cardioelectric patient monitor |
| PCT/CN2017/071585 WO2018126498A1 (en) | 2017-01-03 | 2017-01-18 | Leadless standard electrocardiograph |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710000941.9A CN106725438A (en) | 2017-01-03 | 2017-01-03 | Without conducting wire standard cardioelectric patient monitor |
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| CN109259758A (en) * | 2018-12-05 | 2019-01-25 | 青岛市市立医院 | A kind of electrocardiogram wireless acquisition system |
| CN110897632A (en) * | 2019-12-13 | 2020-03-24 | 复旦大学 | Full-wireless distributed human physiological signal acquisition active electrode system |
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