CN208808468U - Wireless pressure electrocardio measuring device - Google Patents
Wireless pressure electrocardio measuring device Download PDFInfo
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- CN208808468U CN208808468U CN201721048185.9U CN201721048185U CN208808468U CN 208808468 U CN208808468 U CN 208808468U CN 201721048185 U CN201721048185 U CN 201721048185U CN 208808468 U CN208808468 U CN 208808468U
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
- A61B5/316—Modalities, i.e. specific diagnostic methods
- A61B5/318—Heart-related electrical modalities, e.g. electrocardiography [ECG]
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/0002—Remote monitoring of patients using telemetry, e.g. transmission of vital signals via a communication network
- A61B5/0004—Remote monitoring of patients using telemetry, e.g. transmission of vital signals via a communication network characterised by the type of physiological signal transmitted
- A61B5/0006—ECG or EEG signals
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B2576/00—Medical imaging apparatus involving image processing or analysis
- A61B2576/02—Medical imaging apparatus involving image processing or analysis specially adapted for a particular organ or body part
- A61B2576/023—Medical imaging apparatus involving image processing or analysis specially adapted for a particular organ or body part for the heart
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- Measurement And Recording Of Electrical Phenomena And Electrical Characteristics Of The Living Body (AREA)
Abstract
The utility model embodiment provides a kind of wireless pressure electrocardio measuring device, comprising: front end electrocardiogram acquisition circuit, AD conversion unit, the first RF transmit-receive circuit, the second RF transmit-receive circuit, D/A converting circuit, the front-end acquisition circuit handles human ecg signal, so that signal meets the input requirements of the AD conversion unit, the AD conversion unit digitizes electric signal, and first RF transmit-receive circuit then transmits wirelessly digitlization electrocardiosignal；Second RF transmit-receive circuit is used to receive the first RF transmit-receive circuit by the digitlization electrocardiosignal of wireless transmission, and controls the D/A converting circuit output electric signal, while electric signal is reduced to original human ecg signal by the D/A converting circuit；Final output being signally attached on patient monitor and being shown by patient monitor to electrocardiosignal.
Description
Technical field
The utility model embodiment is related to electrocardio field of measuring technique more particularly to a kind of wireless pressure electrocardio measuring device.
Background technique
Patient monitor is the instrument of a kind of measurement and control physiological parameters of patients.Patient monitor can provide weight for medical clinic applications
The patient information wanted, by various functional modules, can the electrocardiosignal of real-time monitoring human body, heart rate, blood oxygen saturation, blood pressure,
The important parameters such as respiratory rate and body temperature, if there is exceeded capable of emitting alarm.
The monitoring for being all wired connection mode, i.e., realizing to the various physiological parameters of patient that existing patient monitor uses,
On various one end Jie patient monitors of monitoring probe, an end is connected on patient body, and the physiological parameter of monitoring is more, the monitoring used
It pops one's head in also more, the data line for connecting patient and patient monitor is also more.Especially performing the operation, in the common scene such as ICU nursing,
Excessive data line can form very big interference and obstacle to the operation of doctor.
Wearable medical technology in recent years flourishes, and has more and more wearable medical wireless cardioelectric monitors to produce
Product etc., technology is all more and more mature, but the application of this kind of monitoring technology at present is that mobile phone, PAD or computer etc. carry out
It has been shown that, is primarily adapted for use in home scenarios, very few for the application of professional medical scene, and major limitation also resides in current answer
With mode or an independent system, need a front end electrocardiogram acquisition sensor, the wireless converting unit of a centre and
On the one hand the display composition of one rear end, this kind of mode framework lead to the expensive of whole system, are on the one hand limited to again
The space limitation of operating room is difficult have the space for accommodating an independent display, and another aspect, medical staff has got used to pair
The observation and reference of patient monitor.If it is possible to which the monitoring modes realization such as current existing wireless electrocardiograph monitoring instrument is being supervised
Display will have very important meaning on shield instrument.
Utility model content
In view of this, one of the technical issues of the utility model embodiment is solved is to provide a kind of wireless electrocardio measurement
Device, to overcome in the prior art wireless measurement equipment can not be linked into the technological deficiency in patient monitor, reach using tradition
Patient monitor, on the basis of not changing medical staff's use habit, realize to the wireless vital sign monitoring effect of patient.
The utility model embodiment provides a kind of wireless pressure electrocardio measuring device comprising: front end electrocardiogram acquisition circuit, AD turn
Unit, the first RF transmit-receive circuit, the second RF transmit-receive circuit, D/A converting circuit are changed, the front-end acquisition circuit is to human body
Electrocardiosignal is handled, so that signal meets the input requirements of the AD conversion unit, the AD conversion unit is by electric signal
It is digitized, the first RF transmit-receive circuit then transmits wirelessly digitlization electrocardiosignal；The second radio-frequency receiving-transmitting electricity
Road is used to receive first RF transmit-receive circuit by the digitlization electrocardiosignal of wireless transmission, and controls the digital-to-analogue conversion
Circuit output electric signal, while electric signal is reduced to original human ecg signal by the D/A converting circuit；Final output
It is signally attached on patient monitor and electrocardiosignal is shown by patient monitor.
By above technical scheme as it can be seen that in the utility model embodiment, by the front-end acquisition circuit to human body electrocardio
Signal is handled, so that signal meets the input requirements of the AD conversion unit, the AD conversion unit carries out electric signal
Digitlization, first RF transmit-receive circuit then transmit wirelessly digitlization electrocardiosignal；The second radio-frequency receiving-transmitting electricity
Road is used to receive first RF transmit-receive circuit by the digitlization electrocardiosignal of wireless transmission, and controls the digital-to-analogue conversion
Circuit output electric signal, while electric signal is reduced to original human ecg signal by the D/A converting circuit；Final output
It is signally attached on patient monitor and electrocardiosignal is shown by patient monitor, to overcome above-mentioned technology in the prior art
Defect.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is that some embodiments recorded in the utility model embodiment for those of ordinary skill in the art can also be according to this
A little attached drawings obtain other attached drawings.
Fig. 1 is the structural schematic diagram of the wireless pressure electrocardio measuring device in the utility model embodiment；
Fig. 2 is the schematic diagram of mechanism of the generation of the utility model embodiment center telecommunications number；
Fig. 3 is the ecg wave form schematic diagram that primary normal heartbeat generates in the utility model embodiment；
Fig. 4, Fig. 5, Fig. 6 are respectively the common lead system schematic diagram of electrocardiogram acquisition in the utility model embodiment；
Fig. 7 is lead system schematic diagram in the utility model embodiment；
Fig. 8 is front end acquisition module block diagram partial schematic diagram in the utility model embodiment；
Fig. 9 is the block diagram of signal input circuit shown in Fig. 8；
Figure 10 is pre-amplification circuit structural schematic diagram in the utility model embodiment；
Figure 11 is the common connection electrical block diagram of right leg drive in the utility model embodiment.
Specific embodiment
Certainly, any technical solution for implementing the utility model embodiment must be not necessarily required to that reaching above simultaneously owns
Advantage.
In order to make those skilled in the art more fully understand the technical scheme in the embodiment of the utility model, below in conjunction with this
Attached drawing in utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described, shows
So, described embodiment is only the utility model embodiment a part of the embodiment, instead of all the embodiments.Based on this reality
With the embodiment in new embodiment, this is all should belong in those of ordinary skill in the art's every other embodiment obtained
The range of utility model embodiment protection.
Further illustrate that the utility model embodiment implements below with reference to the utility model embodiment attached drawing.
A kind of wireless pressure electrocardio measuring device characterized by comprising front end electrocardiogram acquisition module, AD conversion unit and
One RF transmit-receive circuit.The front end acquisition module handles human ecg signal, so that signal meets the AD conversion
The input requirements of unit, the AD conversion unit digitize electric signal, and first RF transmit-receive circuit then will be digital
Change electrocardiosignal to be transmitted wirelessly.Wireless pressure electrocardio measuring device further include: the second RF transmit-receive circuit, D/A converting circuit.
Second RF transmit-receive circuit is used to receive the digitlization electrocardiosignal that first RF transmit-receive circuit passes through wireless transmission,
And the D/A converting circuit output electric signal is controlled, while electric signal is reduced to original human body heart by the D/A converting circuit
Electric signal.Final output being signally attached on patient monitor and being shown by patient monitor to electrocardiosignal.
Fig. 1 is the structural schematic diagram of the wireless pressure electrocardio measuring device in the utility model embodiment；As shown in Figure 1, it is wrapped
It includes: front end electrocardiogram acquisition module 102, rear end voltage output module 103, connecting line 104 and multi-parameter monitor 105.Wherein:
The front end electrocardiogram acquisition module 102 includes front end electrocardioelectrode 101, AD adapter unit and the first radio-frequency receiving-transmitting electricity
Road, front end electrocardiogram acquisition module 102 is used to acquire the electrocardiosignal on human body, and electrocardiosignal is digitized, and passes through nothing
Line signal is sent out electrocardiosignal is digitized, and rear end voltage output module 103 includes the second RF transmit-receive circuit and digital-to-analogue
Conversion circuit is responsible for the wireless digitizing electrocardiosignal of receiving front-end electrocardiogram acquisition module 102, then will digitlization electrocardio letter
It number is reduced to electrocardiosignal original on human body, and the electrocardiosignal after reduction is transferred to by multi-parameter prison by connecting line 104
Instrument 105 is protected, is processed and displayed by multi-parameter monitor 105.
It, will be with itself only when the front end electrocardiogram acquisition module 102 digitizes the electrocardiosignal in the present embodiment
The ID of one property and the digitlization electrocardiosignal together, are sent by wireless communication channel.Since the present embodiment physical layer uses
Be Wifi signal, according to the agreement of Wifi signal, when front end electrocardiogram acquisition module 102 and rear end voltage output module 103 are every
It is secondary be attached during, rear end voltage output module 103 automatically obtains the MAC Address (generation of front end electrocardiogram acquisition module 102
The ID of table itself uniqueness), whether automatic identification data are acquisition moulds corresponding from the MAC Address when reading data every time
Block sends over, to guarantee the effective and orderly of signal.
In the present embodiment, the front end electrocardiogram acquisition module 102 includes front-end acquisition circuit, AD conversion unit and first
RF transmit-receive circuit.The front-end acquisition circuit handles human ecg signal, so that signal meets AD conversion unit
Input requirements, for digitizing electric signal, the first RF transmit-receive circuit is then used to that electrocardio will to be digitized AD conversion unit
Signal is transmitted wirelessly.Specific acquisition is as described below:
Fig. 2 illustrates the mechanism of the generation of electrocardiosignal, as shown in Fig. 2, electrocardiosignal reacted cardiac excitation generation,
The objective indicator of propagation and recovery process, embodies the potential change between human body different parts.For heart before beating, cardiac muscle is thin
Excitement occurs first for born of the same parents, generates faint electric current.The electric current flows through tissue and conducts to each section.But due to body parts
The difference of tissue, the difference of distance between heart can show different potential changes at each position of body surface.Heart swashs
The dynamic excitement issued from sinoatrial node, rhythmic timing issue excitement and are conducted into two sides atrium and atrioventricular node respectively.Sinus
Room knot is located at atrium dextrum top, so excitement atrium dextrum incoming first, is passed to atrium sinistrum later, causes atrium dextrum and the left heart in succession
(ion concentration difference is big inside and outside cell quiescent condition, is in polarized state for the depolarization effect in room.By agonism after-polarization state
It eliminates and is known as depolarization).Then excitement reaches ventricle by atrioventricular node, atrioventircular bundle, bundle branch and Pu Shi fiber, is almost passed to a left side simultaneously
The internal membrane of heart of right ventricle causes the depolarization effect of ventricle.
Ecg wave form such as Fig. 3 that primary normal heartbeat generates, mainly includes P wave, QRS wave and T wave.P wave generation
Table Atrial depolarization generate waveform.After each process of depolarization, cell can restore original polarized state, referred to as multipole.Atrium
Multipole be embodied in P-R sections, it is generally very unobvious.QRS complex represents the process of depolarization of ventricle, and first downward wave is Q
Wave, first upward wave are R wave, and then downward wave is S wave.Ventricular bipolar then shows as ST section and T wave on electrocardiogram.
The common lead system of electrocardiogram acquisition is 12 lead systems, is made of 6 limb leads and 6 chest leads, respectively
It is denoted as I, II, III, aVR, aVL, aVF, V1~V6.I, II, III is bipolar limb leads, and aVR, aVL, aVF add for unipolar limb
Lead is pressed, V1~V6 is unipolar chest lead, and measurement position and connection type are shown in Fig. 4, Fig. 5, Fig. 6.
Another common lead system is 5 lead systems, is usually used on electrocardiogram recording instrument.This lead system relative to
12 leads are non-diagnostic more suitable for cardioelectric monitor.Its essential record bipolar limb leads I, II, III and any chest leads Vi are (often
See to be V5), measurement position is shown in Fig. 7.
Specifically, in the present embodiment, front end electrocardiogram acquisition module 102 includes electrocardioelectrode, and electrocardioelectrode is connected to human body
On, the electrocardiosignal of human body is connected on AD conversion unit, the digitlization of electrocardiosignal is carried out by AD conversion unit.
Specifically, in the present embodiment, as described in the text of front, cardiac electrical measurement is needed to the same of multiple points of human body
When measure, previous electrode is all single point electrode, and single point electrode is directly buckled on corresponding connecting line, is directly connected to by connecting line
On patient monitor, latching for the point of point one of medical staff one is just needed during operation, while according to connecting line
Color, electrode points are placed into corresponding position physically.Therefore, in the present embodiment, an electrode contains multiple electricity
Electrode can be directly placed on patient by pole, medical staff when operation, and each position of electrode corresponds to automatically
The positions of the electrode points of human body, the button point on electrode directly latches a connecting line for patient monitor at this time.Specifically, due to
In the present embodiment, front end electrocardiogram acquisition module is that wireless is transmitted, so electrode directly passes through lock and the front end heart
Electricity acquisition host is fixed, and connecting line is not needed.
As shown in fig. 7, due in the lead system of standard, the distance between many electrode points position is too long, if completely
Using an electrode include multiple electrodes point by the way of if, the area of electrode will be bigger, across region it is also big, patient
The comfort of wearing is very poor, therefore in the position remote apart from front-end collection host, can include by an other electrode
The mode of multiple electrodes point realizes that another electrode is attached by connecting line and host.
Specifically, in the present embodiment, the front end electrocardiogram acquisition module 102 includes two electrocardioelectrodes, an electrode
Pass through lock and front-end collection host (including foregoing AD conversion unit and first RF transmit-receive circuit) connection, an electricity
Pole is connected by connecting line with connector with front-end collection host.Connector connect by way of, realize electrocardioelectrode and
The replacement cost of equipment can be greatly reduced in the replaceability of AD conversion unit, Yi Genghuan performance, and lock and connecting line are used cooperatively
Mode improve the comfort of wearing simultaneously.
Fig. 8 is front end acquisition module block diagram partial schematic diagram；As shown in Figure 8 comprising signal input circuit 201 is (quite
In above-mentioned front-end acquisition circuit), signal processing circuit 202 (being equivalent to above-mentioned AD conversion unit) and 203 (phase of radio frequency transmitter circuitry
When in above-mentioned RF transmit-receive circuit).
The electrocardiosignal for the human body that signal input circuit 201 mainly extracts above-mentioned electrocardioelectrode is logical according to what is specified
Channel is interrogated, is accessed in signal processing circuit 202, electrocardiosignal is accurately input into signal processing circuit 202 to realize.Letter
Number processing circuit 202 inputs a signal into the electrocardiosignal that circuit 201 transmits and is handled, these, which handle but are not limited to, includes
Differential amplification, modulation conversion and filtering etc., to complete to digitize collected simulated electrocardiosignal, so as to right below
Digitlization electrocardiosignal is packaged and is transmitted.Radio frequency transmitter circuitry 203 is according to wireless transmission protocol, such as WIFI, at signal
The digitlization electrocardiosignal that reason circuit 202 has been converted is packaged, and is passed by radio channel by electrocardiosignal is digitized
It is defeated, in order to be received by rear end electrocardio recovery module.
Fig. 9 is the block diagram of signal input circuit 201 shown in Fig. 8 comprising conducting wire, pre-amplification circuit, rear end are put
Big circuit and driven-right-leg circuit.Wherein conducting wire is used to the voltage signal with human body being connected to pre-amplification circuit,
Pre-amplification circuit is the core of entire signal input circuit, and performance directly affects entire signal input circuit most
Whole performance and effect, rear end amplifying circuit are used for the input voltage range of output signal range, output impedance and ADC, input
Impedance is matched, and driven-right-leg circuit mainly completes measuring totally for signal input circuit and human body and being total to for human body signal
Mould inhibits.
In electrocardio measurement, skin and electrode contact will cause polarizing voltage, if two electrodes are full symmetric, this polarization
Voltage value is identical with phase, will be input to ecg amplifier as DC common-mode signal；Ubiquitous Hz noise is also
A kind of common mode interference.Thus preamplifier has had to very high common-mode rejection ratio (CMRR), and common-mode rejection ratio high energy is fine
Ground inhibits interference.Electrode and skin contact can have polarization resistance, and the movement of measured's body will lead to polarization resistance impedance
Value changes.Polarization resistance can be regarded as entire circuit system source resistance and the input resistance of pre-amplification circuit carries out
Partial pressure, the partial pressure output that the polarization resistance of variation will lead to pre-amplification circuit play pendulum.So being put before electrocardio
The influence of fading that big device must have very high input impedance that could weaken electrocardiosignal.Signal source impedance is generally in tens of Ohms
To between K ohm several, the input impedance of ECG preamplifier should two orders of magnitude at least higher than source impedance, to guarantee signal
It is undistorted.Null offset caused by as electronic circuit temperature change can also seriously affect the inspection of normal electrocardiosignal
It surveys, thus to use the element of Low Drift Temperature, the product of Low Drift Temperature is especially more selected when selecting ecg signal amplifier, it is no
It then will affect the input range of amplifier, so that faint tempolabile signal can not amplify, the low-frequency component in electrocardiosignal cannot
Correctly measured.Therefore common pre-amplification circuit is as shown in Figure 10, is the structure chart of instrumentation op amplifying circuit, point
It is not made of OA1, OA2, OA3 and multiple resistance.Vinp and Vinm is the input terminal of electrocardiosignal, OA1 and OA2 respectively for mentioning
Two nodes of the input impedance of high electrocardiosignal, V1 and V2 are 3 times of Vinp and Vinm differential signals, subsequent Ri, Rf and
OA3 composition differential amplifier circuit is then used to switch to differential signal single-ended signal output, and final output signal can indicate are as follows:
VPACEOUT=3* (Rf/Ri) * (Vinp-Vinm)
Rear end amplifying circuit be used for by the input voltage range of output signal range, output impedance and ADC, input impedance into
Row matching, no longer does excessively repeat herein.
Since displacement current Id can be generated there are capacitive coupling between electrocardioelectrode and power line, displacement current it is most of from
Human body flows through ground, is extremely harmful to human body.Impedance ground between skin and ground connection is Z3, and displacement current flows through Z3 and establishes altogether
Mode voltage influences faint ECG signal sampling very big.It is assumed that the contact resistance of ZI, Z2 between skin and electrode 1,2, Id1
It is electrocardioelectrode 1 with Id2, the displacement current between 2 and power line, then the two of lead signals electrode input A, B is because of displacement
Electric current will generate potential difference:
A kind of effective way for reducing displacement current interference is using right leg drive method, and Figure 11 is the common company of right leg drive
Connect circuit.As shown in figure 11, right leg is not directly grounded but is connected to the output of auxiliary operation amplifier U10.It is normal to put in the past
Common-mode voltage is detected in big circuit, it passes through resistance R39 feedback to right leg after inverting amplifier amplification by auxiliary.Human body
Displacement current is at this time no longer flow into ground but flows into the output of R39 and booster amplifier.R39 plays safeguard protection, works as disease
Occurring when very high voltage booster amplifier between people and ground to be saturated, right leg drive does not work, and at this time U10 is equivalent to ground connection,
R39 plays the role of current-limiting protection at this time.Driven-right-leg circuit can actually regard in parallel by the common-mode voltage of summing point of human body as
Negative-feedback circuit, any displacement current for flowing into human body are substantially equal to the driving current on feedback resistance.As long as amplifier A's opens
Ring gain is sufficiently large, even when there is big displacement current to flow into human body, the current potential of human body keeps zero potential substantially.Using right leg
Driving circuit, to inhibiting not to lose the frequency content of electrocardiosignal as cost for 50Hz interference.But since right leg drive is deposited
In the feed circuit of AC influence voltage, and alternating current is through human body, becomes insecurity factor, current-limiting resistance usually 1M Ω with
On.
In the present embodiment, specifically, the rear end voltage output module 103 passes through described in wireless communication channel reception
Electrocardiogram (ECG) data is digitized, and digitlization electrocardiogram (ECG) data is converted to can be by the received analog voltage signal of multi-parameter monitor.Tool
Body principle is that multi-parameter monitor measures the principle of electrocardiosignal and front end electrocardiogram acquisition module is identical, multi-parameter monitoring
Then voltage signal is carried out relevant processing, is finally shown on the screen by instrument by the voltage signal of detection input signal
Show.
In the present embodiment, the rear end electrocardiosignal recovery module includes the second RF transmit-receive circuit, digital-to-analogue conversion electricity
Road.The D/A converting circuit includes D/A converter and analog signal conditioning circuit, and the D/A converter is used for the number
The electrocardiosignal of change is converted to simulated electric signal, and the analog signal conditioning circuit is used for the simulated electric signal
It is restored to obtain original electro-cardiologic signals.Second RF transmit-receive circuit passes through wireless for receiving front-end electrocardiogram acquisition module
Then the digitlization electrocardiosignal sended over controls D/A converter and exports corresponding waveform electric signal, analog signal conditioner electricity
Waveform signal for being filtered, amplifying by road, difference turns the processing such as single-ended, and electric signal is reduced to original human body electrocardio and is believed
Number.
As shown in figure 3, the amplitude of electrocardiosignal is generally between 1-2mV, it is different according to the individual difference of human body, normally
In the case of do not exceed 5mV.So in actual implementation process, if the ecg wave form electric signal of D/A converter output and
When being exported according to original waveform, often influenced that cardiac electrical waveform can be exported to generate to be distorted by the resolution ratio of DA.
Such as Fig. 4, shown in 5,6, in cardiac electrical collection process, digitized ecg wave form is mostly the differential signal between two electrode points,
So then needing analog signal conditioning circuit to be filtered waveform signal, amplify after the ecg wave form signal of DA output
Turn single-ended processing with difference, so that differential signal to be converted to the waveform signal of single electrode point.
In the present embodiment, the rear end electrocardiosignal recovery module and multi-parameter monitor are realized altogether, altogether place voltage
Near 1/2 supply voltage close to analog circuit.Actually it is total to the electricity that place is the right leg drive of multi-parameter monitor
Road output, as shown in figure 11.
In the present embodiment, the electric signal that the D/A converter converts should be exchange electrocardiosignal and be superimposed upon one directly
The electric signal exported on galvanic electricity signal.
Under normal circumstances, analog signal conditioning circuit is made up of various operational amplifiers, and one of operational amplifier
Very crucial index is linear input range, if only input of the exchange electrocardiosignal as operational amplifier, exchanges letter
It number is likely to be exactly in the nonlinear area of operational amplifier, therefore passes through and be superimposed one on the basis of exchanging electrocardiosignal
The mode of DC signal realizes the linear region that ac signal is exactly in operational amplifier, actually gives
Operational amplifier provides a direct current biasing.
In the present embodiment, electrocardiosignal included in the electric signal that the D/A converter converts output when
Amplify through passing through, 2 times of voltage magnitude of the voltage magnitude that DA is exported at least more than original electrocardiographicdigital.Then in the present embodiment, actually
DA output voltage magnitude have reached 50 times of original electrocardiographicdigital voltage magnitude or so.
Specifically, in the present embodiment, D/A converter (abbreviation DA) is converted to the digitized electrocardiosignal
When processing, including amplifying processing to simulated electrocardiosignal, output voltage amplitude is greater than the electrocardiosignal amplitude of acquisition.
In general the output noise and precision of DA is all the limitation by resolution ratio, and the higher DA device price of resolution ratio is higher,
As previously mentioned, the amplitude of normal electrocardiosignal is within 5mV.If with a 16bit, for reference voltage is the DA of 5V,
The resolution ratio of the output signal of 5mV only has 4bit, if exported according to the signal of open width value, the quality of electrocardiosignal will
It is particularly poor, there is the distorted signals of height.It, will be very big if exporting electrocardiosignal according to 100 times of amplification from the end DA
Ground improves signal quality, improves the signal-to-noise ratio of the electrocardiosignal of DA output, therefore in the output end of DA according to output voltage amplitude
Electrocardiosignal amplitude greater than acquisition is necessary.
In the present embodiment, the analog signal conditioning circuit includes signal amplification circuit and differential-to-single-ended circuit, signal
Voltage signal magnitude after amplifying circuit exports the DA is adjusted, and is exported as the differential signal of original amplitude, difference turn
Differential signal is reduced to single-ended signal to facilitate multi-parameter monitor to receive by single-end circuit, while guaranteeing the letter that patient monitor is shown
It number is the undistorted signal with frequencies such as the amplitudes such as original electrocardiosignal.
In the present embodiment, the voltage signal magnitude after the analog signal conditioning circuit exports the DA is adjusted,
Centre output is the differential signal of original amplitude.Specifically, as previously mentioned, cardiac electrical acquisition is all the difference between certain two point
Signal, so intermediate circuit must restore original differential signal.
Specifically, in the present embodiment, the analog signal conditioning circuit final output is multiple single-ended signals, for patient monitor
It receives.It is embodied in, electrocardiogram acquisition module acquisition in front end is all differential signal, such as the differential signal of LA-RA, LA-LL
Differential signal etc., but the incoming end of patient monitor is still in the form of the single-points such as LR, LL, LR, therefore analog signal conditioner electricity
Road needs to handle cardiac electrical differential signal, it is single-ended to generate LL, LA, RA of single-point etc. to be matched with patient monitor
Voltage signal.
Claims (1)
1. a kind of wireless pressure electrocardio measuring device characterized by comprising front end electrocardiogram acquisition circuit, AD conversion unit, first are penetrated
Frequency transmission circuit, the second RF transmit-receive circuit, D/A converting circuit, the front-end acquisition circuit to human ecg signal at
Reason, so that signal meets the input requirements of the AD conversion unit, the AD conversion unit digitizes electric signal, described
First RF transmit-receive circuit then transmits wirelessly digitlization electrocardiosignal；Second RF transmit-receive circuit is for receiving institute
The first RF transmit-receive circuit is stated by the digitlization electrocardiosignal of wireless transmission, and controls the D/A converting circuit output telecommunications
Number, while electric signal is reduced to original human ecg signal by the D/A converting circuit；Final output is signally attached to supervise
Electrocardiosignal is shown on shield instrument and by patient monitor；
The D/A converting circuit and patient monitor realize that altogether place voltage is close to the 1/2 of the D/A converting circuit altogether
Supply voltage；The front end electrocardiogram acquisition circuit further includes electrocardioelectrode, for electrocardiosignal to be connected to the front-end collection
On circuit；
The electrocardioelectrode includes connecting line, can be connected by connector with the front end electrocardiogram acquisition module；
The electrocardioelectrode includes multiple electrodes point, and Different electrodes point obtains the electrocardiosignal of patient's difference physical feeling to realize
Multimetering；
The electrode comprising multiple electrodes point can be directly fastened on above the front end electrocardiogram acquisition module by connector；
The D/A converting circuit includes D/A converter and analog signal conditioning circuit, and the D/A converter is used for the number
The electrocardiosignal of change is converted to simulated electric signal, and the analog signal conditioning circuit is used for the simulated electric signal
It is restored to obtain original electro-cardiologic signals；
When the D/A converter carries out conversion process to the digitized electrocardiosignal, it is superimposed upon by the way that electrocardiosignal will be exchanged
Simulated electrocardiosignal is obtained on DC signal；The D/A converter is converted to the digitized electrocardiosignal
When processing, including amplifying processing to simulated electrocardiosignal, output voltage amplitude is greater than the electrocardiosignal amplitude of acquisition；
The analog signal conditioning circuit includes signal amplification circuit and differential-to-single-ended circuit, and the signal amplification circuit is used for
The simulated electrocardiosignal amplitude that the D/A converter is exported is adjusted, the simulated electrocardio letter of output difference form
Number, the simulated electrocardiosignal of difference form is reduced to single-ended signal can be connect by patient monitor by the differential-to-single-ended circuit
It receives；
Voltage signal magnitude after the analog signal conditioning circuit exports the DA is adjusted, and centre output is original width
The differential signal of value；
The analog signal conditioning circuit final output is multiple single-ended signals, is received for patient monitor.
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| CN108542379A (en) * | 2018-06-01 | 2018-09-18 | 北京卓冉科技有限公司 | Heart early-warning apparatus |
| CN109259755A (en) * | 2018-09-02 | 2019-01-25 | 铂元智能科技(北京)有限公司 | More life sign measurement patches and method |
| CN109091136A (en) * | 2018-09-02 | 2018-12-28 | 铂元智能科技(北京)有限公司 | More vital sign sensors |
| CN111387972B (en) * | 2020-04-20 | 2023-10-31 | 广州易风健康科技股份有限公司 | Weak current signal acquisition circuit and seat ring and toilet cover with same |
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| CN2664593Y (en) * | 2003-10-27 | 2004-12-22 | 深圳迈瑞生物医疗电子股份有限公司 | Body surface electrocardiosignal monitoring circuit |
| CN1611185A (en) * | 2003-10-27 | 2005-05-04 | 深圳迈瑞生物医疗电子股份有限公司 | Circuit configuration method and device for monitoring body surface electrocardio signal |
| CN100423688C (en) * | 2005-10-19 | 2008-10-08 | 深圳迈瑞生物医疗电子股份有限公司 | Method and apparatus for inhibiting power frequency common-mode interference |
| CN101548886A (en) * | 2009-04-17 | 2009-10-07 | 武汉依瑞德医疗设备新技术有限公司 | AED bluetooth cardiac monitoring device |
| CN101664308A (en) * | 2009-09-21 | 2010-03-10 | 上海交通大学 | Wireless and portable heart rate variability monitor device |
| CN201968678U (en) * | 2011-02-17 | 2011-09-14 | 深圳华清心仪医疗电子有限公司 | Electrocardio signal collecting unit and circuit thereof |
| CN202553925U (en) * | 2012-05-07 | 2012-11-28 | 上海理工大学 | Simple wireless electrocardiogram detecting apparatus |
| CN204233122U (en) * | 2014-11-25 | 2015-04-01 | 黑龙江省经济管理干部学院 | For enlarge leadingly and the driven-right-leg circuit of Electro-cadiogram signals detector system |
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| CN106236081A (en) * | 2016-08-24 | 2016-12-21 | 滁州学院 | Portable brain electric instrument based on DSP, ARM |
| CN106419894B (en) * | 2016-10-11 | 2019-08-02 | 江苏南大五维电子科技有限公司 | One kind acquiring front-end processing circuit for electro-physiological signals |
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