CN102178521A - Physiological signal monitoring device - Google Patents
Physiological signal monitoring device Download PDFInfo
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- CN102178521A CN102178521A CN 201110095060 CN201110095060A CN102178521A CN 102178521 A CN102178521 A CN 102178521A CN 201110095060 CN201110095060 CN 201110095060 CN 201110095060 A CN201110095060 A CN 201110095060A CN 102178521 A CN102178521 A CN 102178521A
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Abstract
The invention discloses a physiological signal monitoring device, which comprises acquisition electrodes, a signal amplifying circuit, a signal processing circuit and a data output interface or a data transmitting device, wherein the acquisition electrodes, the signal amplifying circuit, the signal processing circuit and the data output interface or the data transmitting device form an electrical path; the acquisition electrodes comprise two signal acquisition electrodes and a common reference electrode; the signal amplifying circuit comprises a high-impedance isolating preceding stage, a signal amplifier and a common-mode suppression amplifier; an input end of the high-impedance isolating preceding stage is connected with lead-out parts of the two signal acquisition electrodes, and an output end of the high-impedance isolating preceding stage is connected with an input end of the signal amplifier; an output end of the signal amplifier is communicated with the signal processing circuit; and the common-mode suppression amplifier is connected with the output end of the signal amplifier, and an output end of the common-mode suppression amplifier is connected with the common reference electrode. In the physiological signal monitoring device, non-distortion of a physiological signal and flexibility of the signal are guaranteed by arranging the common-mode suppression amplifier and the high-impedance isolating preceding stage.
Description
Technical field
The present invention relates to the collection and the monitoring of physiological signal, relate in particular to a kind of device for monitoring physiological signals.
Background technology
Along with people's living standard is more and more higher, people's health problem is also more and more outstanding.Cardiovascular and cerebrovascular disease, hypertension are in the high-incidence season, and age of onset more and more early.This disease all has the process of a long-term accumulated, and morbidity is also dangerous suddenly.How to monitor the rule of morbidity, giving warning in advance when having the morbidity sign just seems particularly important.
From the angle of medical research and medical field, the operation of each organ that human body earns a bare living all can be followed bioelectric generation and transmission, by for bioelectric research and observation, can understand the ruuning situation of organ comparatively intuitively.Therefore, bioelectric monitoring is extremely important.
But the bio electricity as physiological signal is very faint, also needs just to be used to judge through subsequent treatment such as amplification patient's physiological situation.With the cardioelectric monitor is example, and the doctor uses the important references of electrocardiogram as heart disease diagnosis.Routine electrocardiogram is patient's short time electrocardio-activity by the electrocardiograph of hospital record under the situation of reposing, electrocardiograph adopts 12 lead systems to gather electrocardiosignal usually, need to place metal electrode at the health each several part, electrode links to each other with the galvanometric both positive and negative polarity of electrocardiograph by the line that leads.Lead system can be subjected to extraneous interference when gathering electrocardiosignal, therefore the subsequent process circuit after the signals collecting need be eliminated interfering signal, electrocardiosignal is amplified back output, be to eliminate interfering signal as common return in the electrocardiograph of routine by the circuit that leads that is called as " contact electrode ", at first from the signal circuit that collects, isolate interfering signal through anti-phase amplification, then through " contact electrode " counter inject in the human body to import respectively to lead by human body eliminate interfering signal.In actual applications, anti-phase interfering signal after the amplification and former interfering signal are actual can not be offset fully, therefore also needs could obtain electrocardiosignal relatively reliably through means such as multiple filters.Therefore, electrocardiograph also comprises amplifying circuit and filter circuit etc., its complex structure, need be operated by the special messenger in hospital.Because heart attack has a very big occasionality and sudden, to obtain the probability of disease information very low so do the routine electrocardiogram inspection in non-stage of attack.For obtaining the information of effectively guarding, just need for a long time, in real time, physiologic signal monitoring data accurately, this just requires the monitoring instrument operation to want simple, the patient can use voluntarily at home, need simultaneously to be worn on and do not influence daily life on the health, the design of its structural circuit will guarantee that instrument is small and exquisite, and is easy to carry.
On the other hand, bioelectric monitoring at first need use detecting electrode that bio electricity is gathered.
From detecting on the mode, detecting electrode can be divided into built-in (comprising the formula of thrusting and implanted) substantially; External.The external electrode is that electrode is contacted with body surface, is guided out bioelectrical signals from body surface, is also referred to as " guiding electrode ".In body surface bio electricity testing process, must be true and stable to detected signal.But stable between skin surface and the detecting electrode, to contact reliably be not facile.The instability of contact condition, can directly cause the variation of contact resistance, cause medical circle to be referred to as the distortion of " artifact waveform ", and multichannel detect and the cotype detection in, the variation of contact resistance and uneven very big outer input noise and the power frequency of also can causing are disturbed, even influence is measured.
For addressing the above problem, in bio electricity gatherer process in the past, adopt metal material to make acquisition electrode, make " negative-pressure adsorption " or " stickup " mode, simultaneously the skin of test point is done correspondingly and handled, promptly polish off keratodermatitis, clean, smear conductive paste, in signal acquisition process, contact and contact resistance relatively stable with the relative fixed of skin in the hope of electrode with fine sandpaper.
Though the occupation mode of metal electrode and electrode can detect body surface electric signals, also there are a lot of problems.Metal can cause the infiltration of metallic molecule to skin with contacting of skin, " negative-pressure adsorption " can cause the change of local red and swollen congestion, skin and subcutaneous tissue injury and skin and subcutaneous tissue electric conductivity, also can exert an influence to detect the half-cell effect of verity.
The half-cell effect is that a kind of intrasonic that the metal guide electrode in use forms is disturbed.Its origin cause of formation is: when using the metal guide electrode, form stable contact condition for asking with skin, want cleaning skin in advance, use conductive paste.In testing process, clean solution, conductive paste and a large amount of ionic electrolyte solutions of body surface transudate mixing formation.When electrolyte solution contacted with metal electrode, the atom of metal electrode will lose some electronics and enter solution, and some metal ions in the solution will deposit at surface of metal electrode.During these two kinds of process relative equilibriums, near metal electrode and solution contact surface, form charge distribution layers, also be electric double layer, and it is poor to set up an equilibrium potential.This process and result are just like half electrolytic cell is called as the half-cell effect.When flowing through electrolyte solution and metal electrode, can make metal electrode produce polarization phenomena as electric current (comprising signal code, interfering signal electric current, amplifier input current etc.).Flow through the variation of electric current, will the current potential of half-cell and the polarization phenomena of metal electrode be changed thereupon.And make in the method for paste, in long-time testing process, cause the phenomenon of glandular integumentaria obstruction and skin allergy easily, can not guarantee that the signal that collects is authentic and valid.To electrocardiosignal during than the long duration acquisition and recording (for example: hotler) use metal electrode to limit patient's action, also be difficult to guarantee the true of ecg signal acquiring, effectively.
And, use metal electrode to gather the body surface signal and can bring discomfort to human body, especially to child patient, the discomfort of using the metal electrode collection to bring, often cause its waive the inspection or checking process in unpeace cause electrode and contact skin to change, influence testing result or causes detecting and fail.
Conductive rubber refers to that volume resistance is 10
9Ohm/cm is a kind of macromolecule conducting material that is used in the light current field with interior rubber.Being divided into metal according to the difference of conductive filler is conductive rubber and carbon series conductive rubber, metal is that conductive rubber is mixed metal powder and a metallic fiber etc. in rubber, more common conductive filler such as glass silvering, aluminum is silver-plated, silver-colored, nickel is silver-plated, copper is silver-plated and nickel copper-clad etc., these conductive particles are filled in the rubber, when being filled into certain volume parts, being in contact with one another and obtaining electric conductivity.
It is conductive rubber that Chinese patent " a kind of electrocardio-data collection band " (ZL201020202052.7) discloses a kind of metal as crosslinking electrode.Conductive particles such as this conductive rubber is silver-plated with glass silvering, aluminum, silver are evenly distributed in the silicone rubber, make the conductive particle contact reach excellent conducting performance by pressure.Therefore above-mentioned conductive rubber need mix metallic particles, and the electric conductivity of dependence metallic particles plays the effect of conduction, on the stricti jurise, still belongs to the category of metal species electrode.When electrode of making of this conductive rubber and contact skin, still can cause the infiltration of metallic molecule to skin, and the existence of half-cell effect.
Carbon series conductive rubber then is filling white carbon black, graphite and CNT even bamboo charcoal etc. in rubber, as Chinese patent application " preparation method of bamboo charcoal-based highly conductive rubber (200810244769.2) "; " a kind of room temperature vulcanized conductive silicon rubber and preparation method thereof (201010011842.9) "; " preparation of composite conducting rubber polymer material (ZL00119155.1) ".
Above-mentioned prior art shows that because white carbon black is poor slightly with respect to its electric conductivity of metal material, its resistivity is 10-10
8Ω cm, it adds the performance such as electric conductivity, pliability, hot strength, stretcher strain rate that sooty granular size, ratio will influence conductive rubber.
On the one hand, the electric conductivity of carbon series conductive rubber is directly proportional with the carbon amount of mixing, and on the other hand, along with the increase of carbon incorporation, the hardness of conductive rubber is also increasing.And because of volume resistance is bigger, carbon series conductive rubber will approach as far as possible could obtain electric conductivity preferably.Simultaneously, general conductive rubber can mix harmful additive.
Comprehensive above-mentioned reason has not yet to see the carbon series conductive rubber applications in as the direct report of the physiological signal detecting electrode of contact human body.
Summary of the invention
The object of the present invention is to provide a kind of device for monitoring physiological signals, Monitoring Data can be provided for a long time, in real time.
Device for monitoring physiological signals of the present invention, comprise acquisition electrode, one signal amplification circuit, one signal processing circuit, data output interface or data sending apparatus, acquisition electrode and signal amplification circuit, signal processing circuit, data output interface or data sending apparatus constitute electric pathway, acquisition electrode comprises two electrode signal acquisitions and a shared reference electrode, signal amplification circuit comprises high impedance isolation prime, one signal amplifier and a common mode rejective amplifier, the input of high impedance isolation prime connects the lead division of described two electrode signal acquisitions, and its outfan is connected with the signal amplifier input; The outfan of signal amplifier is communicated with signal processing circuit; The common mode inhibition amplifier is connected with the outfan of signal amplifier, and its outfan is connected with shared reference electrode.
Described data sending apparatus is a wireless launcher.
Described signal processing circuit is converted to data flow output with signal processing results.
Described device for monitoring physiological signals has a housing, and described signal amplification circuit, signal processing circuit, data output interface or data sending apparatus are arranged in the housing; Three electrode interfaces that are electrically connected with described signal amplification circuit are set on the housing front panel, and wherein two electrode signal acquisition interfaces are symmetricly set in common reference electrode interface both sides.
Each described electrode interface is a fixed card slot, establishes the conduction contact spring; Each described electrode is pressed in the draw-in groove, and physiological signal acquisition layer lower surface has the path of electrical connection with contact spring.
Two electrode signal acquisitions are strip, and common reference electrode is circular.
Described device for monitoring physiological signals acquisition electrode is the ecg signal acquiring electrode, and promptly device for monitoring physiological signals is the heart signal monitor.
Described heart signal monitor also comprises a chest tone pick off (also be heart sound transducer, be used to monitor chest tone or cardiechema signals), has two lead-in wires, a lead-in wire ground connection; One chest tone signal amplifier, another lead-in wire of its input and chest tone pick off is electrically connected, and its outfan has the path of electrical connection with described signal processing circuit.
Described heart signal monitor also comprises a chest tone pick off, has two lead-in wires, a lead-in wire ground connection; One pre-amplifier, another lead-in wire of its input and chest tone pick off is electrically connected; One chest tone signal amplifier, its input is connected with the pre-amplifier outfan, and its outfan has the path of electrical connection with described signal processing circuit.
Described chest tone pick off is fixed in described common reference electrode internal ring portion.
Described chest tone pick off is the disc piezoelectric ceramic piece.
Described heart signal monitor comprises that two ecg signal acquiring electrodes and have the common reference electrode of same structure, and wherein two ecg signal acquiring electrodes are strip, and common reference electrode is circular; One high impedance is isolated front stage circuits, and its input connects the lead division of described two heart acquisition electrodes, and its outfan is connected with the heart signal amplifier in; The outfan of heart signal amplifier is communicated with signal processing circuit through interface circuit, A/D converter; One common mode rejective amplifier is connected with the outfan of heart signal amplifier, and its outfan is connected with shared reference electrode.
Described heart signal monitor also comprises a chest tone pick off, has two lead-in wires, a lead-in wire ground connection; One pre-amplifier, another lead-in wire of its input and chest tone pick off is electrically connected; One chest tone signal amplifier, its input is connected with the pre-amplifier outfan, and its outfan has the path of electrical connection with described signal processing circuit; Described chest tone pick off is fixed in described reference electrode internal ring portion; The chest tone pick off is communicated with signal processing circuit through pre-amplifier, chest tone amplifier, interface circuit, A/D converter.
Device for monitoring physiological signals comprises one or more physiological signal acquisition electrodes, one signal amplification circuit, one signal processing circuit, data output interface or data sending apparatus, each acquisition electrode and signal amplification circuit, signal processing circuit, data output interface or data sending apparatus constitute electric pathway, described physiological signal acquisition electrode, comprise a physiology signals collecting layer and a basic unit, one physiology signals collecting layer lower surface contacts with the basic unit upper surface, and basic unit's upper surface has the path of electrical connection with physiological signal acquisition layer lower surface; Described physiological signal acquisition layer is a conductive rubber composite material, comprises the rubber of percentage by weight 70%～85% and the carbon dust of percentage by weight 15%～30%.
Described basic unit is a sheet metal; Or be a rubber basic unit, a physiology signals collecting layer lower surface connects the lead-in wire that passes rubber basic unit; Or comprise one first sheet metal, rubber basic unit and one second sheet metal; Described physiological signal acquisition layer, first sheet metal, rubber basic unit, second sheet metal stack gradually, and a lead-in wire penetrates rubber basic unit and connects described first sheet metal and second sheet metal.
Described carbon dust is a 800-1200 order carbon dust, and the thickness of described physiological signal acquisition layer is 0.8mm～1.0mm; The hardness of described rubber basic unit is less than the hardness of described physiological signal acquisition layer, and thickness is greater than the thickness of described physiological signal acquisition layer.
The rubber that described physiological signal acquisition layer comprises is selected from the rubber that meets the international food safety criterion.
The non-smooth surface that contacts with basic unit of described physiological signal acquisition layer is smooth;
Device for monitoring physiological signals of the present invention adopts two electrode signal acquisitions and a common reference electrode that places between two acquisition electrodes.To collect two kinds of signals: the physiological signal that the first will be gathered promptly is the electrocardiosignal of source to skin conductance with the health; Its two power frequency electromagnetic field that exists for surrounding space disturbs and other interfering signals to the power frequency of ground conduction by human body and skin with other interfere with electromagnetic field.
And two electrode signal acquisitions and shared reference electrode are arranged as symmetric mode, and the point midway of common reference electrode between two acquisition electrodes, two electrode signal acquisitions are strip, common reference electrode is circular, making two electrode signal acquisitions is symmetrical centre with the common reference electrode, the signal that collects can be decomposed into two equal and opposite in directions, opposite polarity physiological signal (title difference mode signal) and two equal and opposite in directions, the interfering signal that polarity is identical (comprising the power frequency interference) (title common mode interference signal), the transmission path of common mode interference signal is to enter the earth by human body, and its actual reference point is a earth.
Device for monitoring physiological signals of the present invention by the utmost point before common mode inhibition amplifier and high impedance are set isolate, has guaranteed the sensitivity of the undistorted and signal of physiological signal.The input of signal amplifier is designed to the anti-common-mode circuit of three end dual inputs.It only does conduction to common-mode signal, and difference mode signal is amplified, and the prime of amplifier (input stage) designing gain is 1 (high impedance isolation).Because the shared of acquisition electrode do not connect the earth with reference to the utmost point, with reference to introducing very big interfering signal extremely equally; Take out the input pin that the common mode interference signal that enters amplifier simultaneously with the physiological signal of being gathered is connected to the common mode inhibition amplifier from the outfan of amplifier, by the common mode inhibition amplifier it is amplified output and is connected to common reference electrode, go up the interfering signal of introducing in order to offset reference electrode (reaching resistance) with contact skin, be reached for ecg signal amplifier and remove interferential effect, improve the signal to noise ratio of heart signal amplifier greatly.
The high impedance isolated amplifier, the prime designing gain is 1, its impedance that presents be several ten thousand to 100,000 times of former input impedance (numerical value is that hundreds of million is to several begohms) so, spread out of the signal of telecommunication from health and all can drop to very for a short time to the influence of whole path resistors (comprising the volume resistance of human body conduction resistance, skin conductance resistance, acquisition electrode and contact skin resistance, acquisition electrode etc.) of signal amplifier and resistance variations, can ignore.Therefore acquisition electrode of the present invention only need touch skin and fixing getting final product, and does not need skin is handled.
Device for monitoring physiological signals of the present invention adopts the wireless data transmission device, is beneficial to the real-time transmission of signal data.
Device for monitoring physiological signals of the present invention, signal data are converted to data flow and send, and have reduced the taking of wireless network resource, and guarantee real-time, the successive transfer of data of multiple user signals data.
Device for monitoring physiological signals of the present invention is provided with the electrode interface of clamp-close type on housing, electrode can be dismantled and change easily.
Cardiac monitoring system of the present invention provides electrocardio and chest tone signal simultaneously, for the physiological situation of accurately judging the user provides more comprehensively data.
Adopt the disc piezoelectric ceramic piece as the chest tone pick off in the cardiac monitoring system of the present invention, reduced other shape piezoelectric ceramics at pressure---in the electrical signal conversion process, frequency inhomogeneities and the collection distortion that causes.
Piezoelectric ceramic piece is placed in the annular common reference electrode, can causes-individual little chest tone collection cavity, improved the sensitivity of gathering.
The acquisition electrode of device for monitoring physiological signals of the present invention adopts conductive rubber, and the ion of having avoided metal electrode and metal species conductive rubber to exist infiltrates and the half-cell effect; On the other hand owing to added base material, avoided since conductive rubber when using as electrode because of too thin and the too hard former thereby counter productive brought.
The rubber basic unit that the present invention is lower in conductive rubber acquisition layer peripheral hardware one hardness, thickness is thicker has reduced the integral hardness of electrode; Moreover conductive rubber acquisition layer of the present invention adopts the elastomeric material that does not contain additive that meets food security standard, has no side effect, and is suitable for using with the human body Long contact time.
By the design of signals collecting layer, sheet metal, rubber basic unit, sheet metal, be the conductive rubber of safety on the one hand with people's contact level; Utilize the conduction of metal material simultaneously, guaranteed the sensitivity and the degree of stability of signal; In addition, the hardness of overall electrode reduces, and eliminates to what human body brought and is not suitable for sense.
Use assembling cardiac monitor of the present invention, can not influence patient's daily routines.Outside depolarization strenuous exercise (play ball, race etc.) and the peculair motion (swimming), medical personnel and patient can pass through the state that electrocardio, chest tone curve are understood heart at any time.Use the cardiac monitor of the nonmetal detecting electrode of assembling medical data of the present invention, can not bring uncomfortable sensation to the patient, life-time service causes any damage also can for skin and subcutaneous tissue.
Description of drawings
Fig. 1 is the structural representation of the cardiac monitor of the embodiment of the invention;
Fig. 2 is the structural representation of acquisition electrode of the cardiac monitor of the embodiment of the invention;
Fig. 3 is the structural representation of fixed card slot on the cardiac monitor collection face of the embodiment of the invention;
Fig. 4 is the acquisition electrode arrangement sketch map that the cardiac monitor of the embodiment of the invention is gathered face;
Fig. 5 is the schematic diagram of ecg signal acquiring amplifying circuit in the cardiac monitor of the embodiment of the invention;
Fig. 6 is the signal curve sectional drawing that the cardiac monitor of the embodiment of the invention sends.
The specific embodiment
Embodiment 1
The preparation of conductive rubber
With the rubber base material of percentage by weight 70% and 30% 1200 purpose carbon dust mix homogeneously; Pour that curing molding gets final product in the pattern into.
The present invention selects the rubber that meets the state food safety criterion for use, stops the toxic and side effects of rubber.
The conductive rubber hardness that makes is 65 °, and thickness is about 1mm, volume resistance 100 Ω.
For reducing owing to ejection adhesion collection in the excretory oils and fats of body surface skin, perspiration and the various bodies taken out of extremely influence testing result in the surface, it is smooth smooth that conductive rubber is pressed close to the one side of skin.
The preparation of electrode
Said method is obtained conductive rubber be prepared as electrode, comprise conductive rubber acquisition layer and rubber basic unit, both stack gradually, and the conductive rubber acquisition layer connects the lead-in wire that passes rubber basic unit.
Rubber-based layer thickness 8mm, with the hardness adding firming agent pattern molding of rubber base material by design, hardness is set in 30 °～35 °.
The preparation of conductive rubber
With the rubber base material of percentage by weight 85% and 15% 800 purpose carbon dust mix homogeneously; Pour that curing molding gets final product in the pattern into.
The hardness of the conductive rubber that makes is 50 °, and thickness is about 0.8mm, and volume resistance is about 400 Ω.
The preparation of electrode
Electrode comprises that said method obtains conductive rubber acquisition layer and sheet metal, and both stack gradually the formation electric pathway.
Sheet metal is a copper sheet, and thickness is 0.3mm.
Embodiment 3
The preparation of conductive rubber
With the rubber base material of percentage by weight 80% and 20% 1000 purpose carbon dust mix homogeneously; Pour that curing molding gets final product in the pattern into.
The hardness of the conductive rubber that makes is 60 °, and thickness is about 0.8mm, and volume resistance is about 300 Ω.
The preparation of electrode
Sheet thicknesses 0.1mm, surface gold-plating.
Rubber-based layer thickness 4mm, with the hardness adding firming agent pattern molding of rubber base material by design, hardness is set in 30 °～35 °
Conductive rubber signals collecting layer, first sheet metal, the rubber basic unit and second sheet metal can make it with the method for bonding or hot melt to become one.Like this, the hardness of electrode integral body is far below the hardness of conductive rubber.
The device for monitoring physiological signals of the electrode preparation that obtains with embodiment 3, this device is cardiac monitor, its acquisition electrode is the ecg signal acquiring electrode.
As shown in Figure 1, device for monitoring physiological signals of the present invention comprises two signal paths:
One is the electrocardiosignal path, the electrocardiosignal that acquisition electrode is adopted transfers to ecg signal amplifier through isolating prime, via interface circuit, be converted into digital signal by A/D converter, transfer to microprocessor and carry out signal processing, be transmitted to corresponding background by wireless launchers such as bluetooths then and handle.
Wherein, microprocessor is not to resemble the mode transfer electrocardiogram image signal by the data hardwood of the prior art, but signal processing results is converted into data flow output.
It two is the chest tone signal path, chest tone pick off 9, as piezoelectric ceramic piece, the chest tone signal of synchronous acquisition is sent to the chest tone signal amplifier through preamplifying circuit, via interface circuit, be converted into digital signal by A/D converter, transfer to microprocessor and carry out signal processing, launch by wireless launchers such as bluetooths then.Similarly, microprocessor is converted into data flow output with signal processing results.
Cardiac monitor has a housing, and signal amplification circuit, signal processing circuit, data output interface or data sending apparatus are arranged in the housing; Three electrode interfaces that are electrically connected with described signal amplification circuit are set on the housing front panel, and wherein two signals collecting, 7 electrode interfaces are symmetricly set in common reference electrode 8 interface both sides.Referring to Fig. 4
The heart signal monitor is provided with two acquisition electrodes 7 and a shared reference electrode 8, adopts the three terminal bidirectional input.As shown in Figure 1 and Figure 4, use two strip acquisition electrodes 7 and a ring shape shared with reference to the utmost point 8.The lead division of two acquisition electrodes 7 is connected with the input of isolating prime respectively, the outfan of isolating prime is connected with the input of ecg amplifier, one outfan connecting interface circuit of ecg amplifier, the difference mode signal that acquisition electrode is obtained sends to A/D converter; This outfan of ecg amplifier is drawn the input pin that connects the common mode inhibition amplifier simultaneously, and the output pin of common mode inhibition amplifier connects shared with reference to the utmost point, offsets the interfering signal that common reference electrode is introduced.
The operation principle of ecg signal acquiring amplification circuits is referring to Fig. 5, and R1, R2, R3, R4, A1, A2, R5, R6, R7 and R9 have constituted high impedance and isolated prime 7, and designing gain is 1; R8, A3, A4, R10, R11, R12 and R13 have constituted heart signal amplifier 8; A5, A6, R14, R15, R16, R17 and R18 constitute common mode inhibition amplifier 9.
The two electrocardiogram acquisition utmost points, 5 input J1 and J2, shared with reference to the utmost point 6 connection J3.When the two electrocardiogram acquisition utmost points 5 and shared when placing left side, patient shirtfront by the arrangement mode of Fig. 4 with reference to the utmost point 6, if extract a positive electrocardiosignal between J1 and the J3, then extract an inversion signal (specifically the arrangement position by acquisition electrode determines) between J2 and the J3, such electrocardiosignal is exactly a difference mode signal.J1, J2 and J3 extract three in-phase common mode interference signals over the ground simultaneously.
Amplifier A1 and A2 pass to outfan to these two signals with 1: 1 amplification quantity.Amplifier A1 and A2 are transferred to signal the input of amplifier A3 and A4 respectively, amplifier A3 and A4 amplify difference mode signal, common mode interference signal only transmitted do not amplify, on the outfan of amplifier A3 and A4, electrocardiosignal be exaggerated and phase place opposite, common mode interference signal is not exaggerated and homophase.
Be connected the resistance R 12 and the R13 of two similar resistance with the outfan of amplifier A4 at the outfan of amplifier A3, the junction point that links together is K, and for difference mode signal, the K o'clock mid point at two inversion signals, its signal are zero; For common mode interference signal, K o'clock mid point two in-phase signals, its signal is identical with the outfan of two amplifiers, the K point is connected to the common mode inhibition amplifier input terminal, the outfan of common mode inhibition amplifier is connected with reference to the utmost point with shared by J3, then the common mode interference signal that obtains from the K point anti-phase again be input to shared with reference to the utmost point, skin with the J3 contact resistance on interfering signal just just the same with the zero point of gathering amplifying circuit to shared signal with reference to the utmost point, also just played the effect of eliminating common mode interference signal.
Shared center fixed chest tone with reference to the utmost point detects the pick off of usefulness: disc piezoelectric ceramic piece, two lead-out wires of pick off be connected respectively to circuit " " and by pre-amplifier to the chest tone amplifier in.
In order to make the cardiac monitor volume little, and be convenient to long periods of wear, as shown in Figure 4, design is useful on the fixedly fixed card slot 5 of acquisition electrode on the front panel of heart signal monitor, contact spring 6 is housed in the draw-in groove 5, and contact spring is with the thin wire welding and be connected respectively to in-phase input end and the common mode inhibition amplifier out that high impedance is isolated prime.Acquisition electrode is pressed into the draw-in groove internal fixation.
Cardiac monitor is established external power interface, or built-in power, and built-in power can be selected rechargeable battery for use, so that power supply to be provided.
Only the electrode collection face of cardiac monitor need be close to shirtfront left side skin during use, put on textile jerkin, with the fixing detection position of cardiac monitor.
More exsiccant weather or winter, available warm water moistens the skin that contacts the acquisition electrode position.After opening cardiac monitor, its detected electrocardiosignal and chest tone signature tune line chart (as shown in Figure 6) can send to the background monitoring terminal by bluetooth transmitters.
Fig. 6 has shown electrocardiosignal and the chest tone signal curve sectional drawing of a time period that real-time monitors, the time that figure upper right corner shows signal is gathered, and the curve representation electrocardiosignal of top among the figure, what lower curve was represented is the chest tone signal.The background monitoring terminal can be judged cardiac conditions of patients according to abnormal graph occurring in the above-mentioned curve chart, shows that such as one between two R ripples in Fig. 6 (b) ascending wave that is lower than the R ripple patient may cardiac extra systole, needs further diagnosis and treatment.
Use cardiac monitor of the present invention, can not influence patient's daily routines.Outside depolarization strenuous exercise (play ball, race etc.) and the peculair motion (swimming), medical personnel and patient can pass through the state of electrocardio, chest tone curve understanding heart at any time, can not bring uncomfortable sensation to the patient, life-time service causes any damage also can for skin and subcutaneous tissue.
Claims (15)
1. device for monitoring physiological signals, comprise acquisition electrode, one signal amplification circuit, one signal processing circuit, data output interface or data sending apparatus, acquisition electrode and signal amplification circuit, signal processing circuit, data output interface or data sending apparatus constitute electric pathway, it is characterized in that, acquisition electrode comprises two electrode signal acquisitions and a shared reference electrode, signal amplification circuit comprises high impedance isolation prime, one signal amplifier and a common mode rejective amplifier, the input of high impedance isolation prime connects the lead division of described two electrode signal acquisitions, and its outfan is connected with the signal amplifier input; The outfan of signal amplifier is communicated with signal processing circuit; The common mode inhibition amplifier is connected with the outfan of signal amplifier, and its outfan is connected with shared reference electrode.
2. device for monitoring physiological signals according to claim 1 is characterized in that, described signal processing circuit is converted to data flow output with signal processing results.
3. device for monitoring physiological signals according to claim 1 is characterized in that, described data sending apparatus is a wireless launcher.
4. device for monitoring physiological signals according to claim 1 is characterized in that described device for monitoring physiological signals has a housing, and described signal amplification circuit, signal processing circuit, data output interface or data sending apparatus are arranged in the housing; Three electrode interfaces that are electrically connected with described signal amplification circuit are set on the housing front panel, and wherein two electrode signal acquisition interfaces are symmetricly set in common reference electrode interface both sides.
5. device for monitoring physiological signals according to claim 4 is characterized in that, each described electrode interface is a fixed card slot, establishes the conduction contact spring; Each described electrode is pressed in the draw-in groove, and physiological signal acquisition layer lower surface has the path of electrical connection with contact spring.
6. device for monitoring physiological signals according to claim 5 is characterized in that, two electrode signal acquisitions are strip, and common reference electrode is circular.
7. device for monitoring physiological signals according to claim 6 is characterized in that, described electrode signal acquisition is the ecg signal acquiring electrode.
8. device for monitoring physiological signals according to claim 7 is characterized in that, described device for monitoring physiological signals also comprises a chest tone pick off, has two lead-in wires, a lead-in wire ground connection; One chest tone signal amplifier, another lead-in wire of its input and chest tone pick off is electrically connected, and its outfan has the path of electrical connection with described signal processing circuit.
9. device for monitoring physiological signals according to claim 7 is characterized in that, described device for monitoring physiological signals also comprises a chest tone pick off, has two lead-in wires, a lead-in wire ground connection; One pre-amplifier, another lead-in wire of its input and chest tone pick off is electrically connected; One chest tone signal amplifier, its input is connected with the pre-amplifier outfan, and its outfan has the path of electrical connection with described signal processing circuit.
10. according to Claim 8 or 9 described device for monitoring physiological signals, it is characterized in that described chest tone pick off is fixed in described common reference electrode internal ring portion.
11. device for monitoring physiological signals according to claim 10 is characterized in that, described chest tone pick off is the disc piezoelectric ceramic piece.
12. device for monitoring physiological signals according to claim 1, it is characterized in that, described acquisition electrode is the physiology electrode signal acquisition, comprise a physiology signals collecting layer and a basic unit, one physiology signals collecting layer lower surface contacts with the basic unit upper surface, and basic unit's upper surface has the path of electrical connection with physiological signal acquisition layer lower surface; Described physiological signal acquisition layer comprises the rubber of percentage by weight 70%～85% and the carbon dust of percentage by weight 15%～30%.
13. device for monitoring physiological signals according to claim 12 is characterized in that, described basic unit is a sheet metal; Or be a rubber basic unit, physiological signal acquisition layer lower surface connects the lead-in wire that passes rubber basic unit; Or comprise one first sheet metal, and rubber basic unit and one second sheet metal, described physiological signal acquisition layer, first sheet metal, rubber basic unit, second sheet metal stack gradually, and a lead-in wire penetrates rubber basic unit and connects described first sheet metal and second sheet metal.
14. physiological signal acquisition electrode according to claim 12 is characterized in that, described carbon dust is a 800-1200 order carbon dust, and the thickness of described physiological signal acquisition layer is 0.8mm～1.0mm; The non-smooth surface that contacts with basic unit of described physiological signal acquisition layer is smooth; The rubber that described physiological signal acquisition layer comprises is selected from the rubber that meets the international food safety criterion.
15. device for monitoring physiological signals according to claim 13 is characterized in that, described physiological signal acquisition layer, first sheet metal, rubber basic unit, second sheet metal adopt method bonding or hot melt to become one.
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Application publication date: 20110914 |