CN108663596A - A kind of wearable ECG lead-fail detector detection device and detection method - Google Patents
A kind of wearable ECG lead-fail detector detection device and detection method Download PDFInfo
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- 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
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Abstract
The invention discloses a kind of wearable ECG lead-fail detector detection devices, including direct current lead-fail detector detection unit, exchange lead-fail detector detection unit, signal gathering unit and processor unit；The direct current lead-fail detector detection unit and the signal input part for exchanging lead-fail detector detection unit are arranged by measuring electrode and human contact respectively；The direct current lead-fail detector detection unit and the signal output end for exchanging lead-fail detector detection unit are connect with the signal input part of signal gathering unit respectively；The signal output end of the signal gathering unit and the signal input part of processor unit connect；By in conjunction with direct current with exchange lead-fail detector detect both of which the advantages of come optimized work flow, obtain best stand-by power consumption and signal detection quality；In addition two kinds of lead-fail detector detections are all made of two electrode designs, and the input impedance in energy active balance electrocardiogram acquisition channel simplifies appearance design difficulty, and the signal quality for combining exchange lead-fail detector detection realization best.
Description
Technical field
The present invention relates to lead-fail detector detection field more particularly to a kind of wearable ECG lead-fail detector detection device and inspections
Survey method.
Background technology
It is applied as tradition, ECG examination has become the big event of modern medical service inspection.With advances in technology,
The especially development of semiconductor technology, small-sized ECG detecting product have been widely used in various portable even wearable
Product scope.These products have the function of the ECG detecting of 1/3 lead mostly, although cannot replace the 5/12 lead profession of hospital
Equipment, but have irreplaceable role in health supervision, disease prevention field.In addition, encouraging classification to examine energetically in country
It treats, under the overall background of intelligent medical treatment, intelligent cardiac is detected as early discovery, the Medical Concept of early treatment provides hardware support.
Traditional cardiac monitoring class product is detected as patient monitor using direct current lead-fail detector, the reason is that direct current lead is de-
It is simple to fall design, can check that reference electrode falls off.Certain cardiac diagnosis class products such as electrocardiograph uses exchange lead-fail detector
Detection, this kind of product generally lay particular emphasis on signal quality but need not accurately detect the dropping situations of reference electrode.Although hospital uses
Most of cardiac monitoring class product use direct current lead-fail detector detection method, but the above problem is very big there is no not caused to performance
It influences, the reason is that input impedance of the medical monitor using the electrode paste of wet type and the contact impedance of human skin relative to equipment
It is very low.However, wearable product considers volume and aesthetic considerations, electrode, which cannot be made, can not use greatly wet type electrode,
This so that contact impedance is high, or even suitable with the input impedance of equipment, and which results in direct current lead-fail detectors not to work, and
Can decay electrocardiosignal to be detected.In this case, no matter direct current or exchange lead-fail detector detection cannot effectively examine
Some extreme high contact impedances or impedance seriously unmatched situation are surveyed, for example has applied hand lotion in user hand, skin surface
Very dry occasion.
In summary, direct current lead-fail detector can effectively distinguish reference electrode and fall off using simply, the inspection of direct current lead-fail detector
Survey only needs detection voltage threshold in wearable product, is more than that threshold value will trigger controller progress relevant treatment.But it uses
The problem of direct current lead detects is main, and there are two aspects：One, pull-up resistor or constant current driving can contribute circuit relatively large
Noise；Two, it is influenced by electrode contact impedance big.Exchange lead-fail detector is smaller to the contribution of circuit noise, it can effectively be examined
The quality of connection of electrode can be obtained again by surveying the lead-fail detector in addition to reference electrode, but it does not have still in current wearable product
There are two the main reason for obtaining large-scale use：One, series connection resistance of the detection result of exchange lead-fail detector easily in by circuit
Hold or be the influence of parasitic capacitance-resistance, that is to say, that the complex impedance of circuit can influence the detection quality of lead-fail detector；Two, exchange is led
Connection, which falls off, needs the participation of software, such as the threshold value of counting circuit complex impedance or progress software filtering processing, such as Hz noise,
This can consume more system power dissipations relative to direct current lead-fail detector.
As described above, direct current with exchange lead-fail detector detection respectively have quality, in conjunction with and optimize two kinds of working methods be to grind
The emphasis of system wearable ECG detection device of new generation；It is therefore necessary to invent one kind can effectively reduce stand-by power consumption and ensure
The wearable ECG lead-fail detector detection device of signal detection quality.
Invention content
Goal of the invention：In order to overcome the deficiencies in the prior art, the present invention provide one kind can effectively reduce it is standby
Power consumption and the wearable ECG lead-fail detector detection device for ensureing signal detection quality.
Technical solution：To achieve the above object, a kind of wearable ECG lead-fail detector detection device of the invention, including it is straight
Flow lead-fail detector detection unit, exchange lead-fail detector detection unit, signal gathering unit and processor unit；The direct current lead
The signal input part of the detection unit that falls off and exchange lead-fail detector detection unit is respectively by measuring electrode and human contact；It is described
Direct current lead-fail detector detection unit and exchange lead-fail detector detection unit signal output end respectively with the letter of signal gathering unit
The connection of number input terminal；The signal output end of the signal gathering unit and the signal input part of processor unit connect.
Further, first is provided in the connection line of the direct current lead-fail detector detection unit and measuring electrode to open
It closes；It is provided with second switch in the connection line of the exchange lead-fail detector detection unit and measuring electrode；The processor list
Member is connect with first switch, second switch circuit, and control and measure device takes off in direct current lead-fail detector detecting state with lead is exchanged
It falls between detecting state and switches；The measuring electrode includes the first measuring electrode and the second measuring electrode；Described first measures electricity
Pole and the second measuring electrode contact two different parts of human body respectively.
Further, the measuring point corresponding to first measuring electrode and the second measuring electrode be both hands, front and
There are the positions of electrocardio potential difference for other.
Further, the detection device further includes super low-power consumption lead level detection unit；The direct current lead-fail detector
The signal output end of detection unit is connect with the signal input part of super low-power consumption lead level detection unit；The super low-power consumption is led
The signal input part of the signal output end and processor unit that join level detection unit connects；The signal of the processor unit is defeated
Outlet is connect with the signal input part of direct current lead-fail detector detection unit.
Further, the detection device further includes positive reverse phase waveform generator；The signal of the processor unit
Output end is connect with the signal input part of positive reverse phase waveform generator；The signal of the positive reverse phase waveform generator is defeated
Outlet is connect with the signal input part of exchange lead-fail detector detection unit.
A kind of wearable ECG lead-fail detector detection method：It mainly includes the following steps that,
Step 1, when without using lead, electrode incoming level is higher than threshold voltage, and processor enables direct current lead-fail detector
Detection unit and super low-power consumption lead level detection unit simultaneously close off signal gathering unit, exchange lead-fail detector detection unit
With positive reverse phase waveform generator, make oneself to enter the standby mode of extremely low power dissipation；
Step 2, when there is electrode to be connected to human body, when electrode incoming level is less than threshold voltage, super low-power consumption lead level
Detection unit exports wake-up signal to processor unit；
Step 3, after processor unit is waken up, enabling signal collecting unit, and close direct current lead-fail detector detection unit
With super low-power consumption lead level detection unit, exchange lead-fail detector detection unit and positive reverse phase waveform generator are then opened
To acquire signal；
Step 4, during signal acquisition, exchange lead-fail detector detection unit, positive reverse phase sine-wave generator, signal acquisition
Unit and processor unit are in operating status；In the meantime, equipment is in exchange lead-fail detector detection pattern, processor list
Member signal of the processing from signal gathering unit simultaneously obtains electrocardiogram (ECG) data and lead-fail detector situation；
Step 5, if lead-fail detector occurs during signal acquisition, processor unit is by exchanging lead-fail detector detection
Unit finds to be restored to the state described in step 1 after the situation, that is, is first shut off exchange lead-fail detector detection unit and just
Then reverse phase waveform generator opens direct current lead-fail detector detection unit and super low-power consumption lead level detection unit, with
Shutdown signal collecting unit afterwards, last processor unit enter the standby mode of extremely low power dissipation.
Advantageous effect：A kind of wearable ECG lead-fail detector detection device of the present invention, by combining direct current to lead with exchanging
Join the advantages of falling off detection both of which and carry out optimized work flow, obtains best stand-by power consumption and signal detection quality；In addition
Two kinds of lead-fail detector detections are all made of two electrode designs, the input impedance in energy active balance electrocardiogram acquisition channel, and combine exchange
Best signal quality is realized in lead-fail detector detection.
Description of the drawings
Attached drawing 1 is the overall structure figure of detection device；
Attached drawing 2 is the circuit framework figure of Traditional DC lead-fail detector detection；
Attached drawing 3 is in conjunction with direct current and the circuit framework figure for exchanging lead-fail detector detection；
Attached drawing 4 is signal acquisition theme circuit diagram；
Attached drawing 5 is RLD driving electrodes circuit diagrams；
Attached drawing 6 is positive reverse phase sinusoidal signal generator circuit diagram.
Specific implementation mode
The present invention is further described below in conjunction with the accompanying drawings.
A kind of wearable ECG lead-fail detector detection device is made of six parts as shown in Fig. 1：Direct current lead-fail detector
Detection unit 2, exchange lead-fail detector detection unit 3, signal gathering unit 4, processor unit 5, the inspection of super low-power consumption lead level
Survey unit 6 and positive reverse phase waveform generator 7；
The direct current lead-fail detector detection unit 2 passes through respectively with the signal input part for exchanging lead-fail detector detection unit 3
Measuring electrode is contacted with human body 1；The direct current lead-fail detector detection unit 2 is defeated with the signal for exchanging lead-fail detector detection unit 3
Outlet is connect with the signal input part of signal gathering unit 4 respectively；The signal output end and processor of the signal gathering unit 4
The signal input part of unit 5 connects.
The direct current lead-fail detector detection unit 2 is provided with first switch in the connection line of measuring electrode；The friendship
Stream lead-fail detector detection unit 3 is provided with second switch in the connection line of measuring electrode；The processor unit 5 and first
Switch, the connection of second switch circuit, control and measure device detect shape in direct current lead-fail detector detecting state with lead-fail detector is exchanged
Switch between state；The measuring electrode includes the first measuring electrode and the second measuring electrode；First measuring electrode and second
Measuring electrode contacts two different parts of human body 1 respectively.
Measuring point corresponding to first measuring electrode and the second measuring electrode be both hands, front and other there are the hearts
The position of electric potential difference.
The detection device further includes super low-power consumption lead level detection unit 6；The direct current lead-fail detector detection unit 2
Signal output end connect with the signal input part of super low-power consumption lead level detection unit 6；The super low-power consumption lead level
The signal output end of detection unit 6 is connect with the signal input part of processor unit 5；The signal of the processor unit 5 exports
End is connect with the signal input part of direct current lead-fail detector detection unit 2.
The detection device further includes positive reverse phase waveform generator 7；The signal output end of the processor unit 5 with
The signal input part connection of positive reverse phase waveform generator 7；The signal output end of the positive reverse phase waveform generator 7 with
Exchange the signal input part connection of lead-fail detector detection unit 3.
A kind of wearable ECG lead-fail detector detection method：It mainly includes the following steps that,
Step 1, when without using lead, electrode incoming level is higher than threshold voltage, and it is de- that processor 5 enables direct current lead
Detection unit 2 and super low-power consumption lead level detection unit 6 are fallen, signal gathering unit 4, exchange lead-fail detector detection are simultaneously closed off
Unit 3 and positive reverse phase waveform generator 7 make oneself to enter the standby mode of extremely low power dissipation；
Step 2, when there is electrode to be connected to human body 1, when electrode incoming level is less than threshold voltage, super low-power consumption lead is electric
Flat detection unit 6 exports wake-up signal to processor unit 5；
Step 3, after processor unit 5 is waken up, enabling signal collecting unit 4, and it is single to close the detection of direct current lead-fail detector
Then member 2 and super low-power consumption lead level detection unit 6 open exchange lead-fail detector detection unit 3 and positive reverse phase sinusoidal waveform
Generator 7 acquires signal；
Step 4, during signal acquisition, exchange lead-fail detector detection unit 3, positive reverse phase sine-wave generator 7, signal are adopted
Collect unit 4 and processor unit 5 is in operating status；In the meantime, equipment is in exchange lead-fail detector detection pattern, processing
Device unit 5 handles the signal from signal gathering unit 4 and obtains electrocardiogram (ECG) data and lead-fail detector situation；
Step 5, if lead-fail detector occurs during signal acquisition, processor unit 5 is by exchanging lead-fail detector detection
It is restored to the state described in step 1 after the discovery of unit 3 situation, that is, is first shut off 3 He of exchange lead-fail detector detection unit
Positive reverse phase waveform generator 7, then opens direct current lead-fail detector detection unit 2 and super low-power consumption lead level detection unit
6, it is then turned off signal gathering unit 4, last processor unit 5 enters the standby mode of extremely low power dissipation.
It should be noted that：With the progress of semiconductor technology, being taken off about direct current with lead is exchanged in processor unit 5
Signal gathering unit 4, direct current lead-fail detector detection unit 2, super low-power consumption may be integrated by falling the detection logic of detection pattern
It is in lead level detection unit 6, exchange lead-fail detector detection unit 3, positive reverse phase waveform generator 7 or above-mentioned all
Unit integrates, and the present invention is convenient just for the sake of description in order to separate each function module.
Super low-power consumption lead level detection unit 6 in attached drawing 1 is the main power consumption under standby mode, depends on device
Power consumption.It illustrates：If each channel uses the super low-power consumption amplifier AD8502 amplifiers and the ultralow work(of ADCMP380 of ADI companies
Consumption comparator consumes 2uA electric currents in total, if AVDD is 3.3V, consumes power consumption in total and is less than 7uW, significantly increase
The cruise duration of detection device.
As shown in Fig. 2, traditional electrocardiogram acquisition circuit detects mould using the direct current lead-fail detector of two or three electrodes
Formula, electrode for the sake of simplicity, can be connected on both hands by position, naturally it is also possible to be connected to front or other positions for surveying potential difference.
This method can be effectively operating in the preferable special medical diagnosis of electrode contact conditions or monitor, but in wearable product
On be likely encountered trouble.It is assumed that the equivalent contact impedance of human body is Rz, then from 2 access of current direction 1 and current direction
On see, the potential difference Δ Vin of circuit input end is according to Ohm's law
It can obtain,
If AVDD=3.3V, AVSS=0V, Rz=Rp=20M Ohm, Re=100K Ohm, then Δ Vin=1.1V,
This is unacceptable, it can cause signal acquisition circuit to be saturated, and since resistance Rz is that time-varying is unstable, Δ Vin
It can not stop to change, this can dramatically increase system noise.
In addition, if connecting interference of the third electrode also from current direction 3, principle is with analysis above, here
It repeats no more.
As shown in Fig. 3, the detection device is optimized using two electrodes and for two kinds of lead-fail detector detection patterns, balance
Interelectrode input impedance, datail description are as follows：
(1) two electrodes only there are two the right-hand man of electrode access human body or elsewhere.Third reference electrode
RLD is only used in exchange lead-fail detector detection pattern；
(2) two groups of switches Sdc and Sac are for controlling and switching different lead-fail detector detection patterns.This two groups of switches are not
It works at the same time, the detection of direct current lead-fail detector is closed Sdc, disconnects Sac, and exchange lead-fail detector detection is closed Sac, disconnects Sdc；
(3) the case where detection of direct current lead-fail detector only operates in device standby or connected without electrode, it only needs low
Power consumption is accurately detected electrode access and wake-up processor or signal processing unit, without making in signal acquisition
With.When direct current lead-fail detector detects, in order to ensure larger input impedance, Rp needs sufficiently large (recommending to be more than 20M ohm),
It additionally needs and is pulled to common power rail AVDD, the deviation voltage for avoiding the potential difference of different electrical power rail from being introduced in input terminal；
(4) when direct current lead-fail detector detects click access, exchange lead-fail detector detection is started to work.In order to reduce letter
Number noise improves the common-mode rejection ratio of circuit, and switch Sac is in input terminal introducing two paths of signals：One, input terminal is passed through into resistance Rp
It is reference electrode to move third electrode RLD, RLD to, can significantly improve the common mode inhibition of system when anti-Hz noise ability, this
It is used in many cardioelectric monitor equipment, this will not be repeated here；Two, low frequency sine wave signal is coupled by isolation capacitance Cp
Onto input channel.
The phase in two channels will differ 180 degree and fall to avoid by circuit common mode inhibition；
Sine-wave excitation frequency should not be arranged in electrocardiosignal bandwidth, such as diagnose electrocardio bandwidth and guard the heart for 150Hz
Electric bandwidth is 40Hz.To ensure that pumping signal can be collected by signal gathering unit simultaneously, meet sampling thheorem.It illustrates：
250Hz excitations, 500/1000Hz sample rates can be used for diagnosis electrocardio；100Hz can be used to encourage for monitoring electrocardio, 200/
400Hz is sampled.It may sometimes need the frequency multiplication for avoiding work frequency as used 80Hz, prevent from interfering；
The capacitive reactance of Cp should meet is more than Rp values under driving frequency, and general value is between 5.6pF~27pF；
It is tight that two electrode designs of input impedance balance can improve equipment input impedance between high input impedance or electrode
Stability and robustness under weight mismatch case.Either direct current still exchanges lead-fail detector detection pattern, all electrodes
Input impedance is balance, and under direct current lead-fail detector pattern, the input impedance of electrode depends on the size of resistance Rp in Fig. 2,
In the case where exchanging lead-fail detector pattern, the input impedance of electrode depends on the size of capacitance Cp, and the smaller input impedance of Cp is bigger.
It is as shown in Fig. 4 signal acquisition theme circuit diagram, it is direct current lead lead-fail detector detection unit 2 in corresponding diagram 1, super
Low-power consumption lead detection unit 6 and signal gathering unit 4.
(1) operational amplifier U5 realizes the function of direct current lead lead-fail detector detection unit 2；
(2) comparator U6, U7 realizes the function of super low-power consumption lead detection unit 6, here resistance R11, R12 and R14,
R15 respectively constitutes bleeder circuit and U6, and U7 internal voltage references 1V makes comparisons, and wake-up signal DC_ will be exported if it is greater than 1V
LF1 and DC_LF2 is to processor unit 5；
(3) U8 alternatives analog switch realizes the effect of switch Sdc and Sac in Fig. 3, the signal DC/ from processor
AC determines closure and the disconnection of switch；
(4) the resistance Rp, C3, C4 that resistance R3, R4 on electrode input channel correspond in Fig. 3 correspond to the electricity in Fig. 3
Hold Cp.Here it is because capacitance has the function of separating direct current, if taken off without using exchange lead that pass Sac is not increased on Cp
Drop only needs processor unit to stop output square-wave signal.
RLD driving electrodes circuit diagrams as shown in Fig. 5, the physical circuit of driving electrodes RLD in corresponding diagram 3, output letter
Number it is RLD, RLD signals can select in figure 3 by switch Sac；
Positive reverse phase sinusoidal signal generator circuit diagram as shown in Fig. 6, input signal Square_Controller are
Come from the square-wave signal of processor unit 5, can arbitrarily be programmed by processor, output signal is AC+ and AC- in attached drawing 3
Signal.
The above is only a preferred embodiment of the present invention, it should be pointed out that：For the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (6)
1. a kind of wearable ECG lead-fail detector detection device, it is characterised in that：Including direct current lead-fail detector detection unit (2),
Exchange lead-fail detector detection unit (3), signal gathering unit (4) and processor unit (5)；The direct current lead-fail detector detection is single
The signal input part of first (2) and exchange lead-fail detector detection unit (3) is contacted by measuring electrode with human body (1) respectively；It is described
Direct current lead-fail detector detection unit (2) and exchange lead-fail detector detection unit (3) signal output end respectively with signal acquisition list
The signal input part connection of first (4)；The signal of the signal output end and processor unit (5) of the signal gathering unit (4) is defeated
Enter end connection.
2. a kind of wearable ECG lead-fail detector detection device according to claim 1, it is characterised in that：The direct current is led
Join the detection unit (2) that falls off and is provided with first switch in the connection line of measuring electrode；The exchange lead-fail detector detection is single
First (3) are provided with second switch in the connection line of measuring electrode；The processor unit (5) is opened with first switch, second
Powered-down road connection, control and measure device switch between direct current lead-fail detector detecting state and exchange lead-fail detector detecting state；
The measuring electrode includes the first measuring electrode and the second measuring electrode；First measuring electrode and the second measuring electrode difference
Contact two different parts of human body (1).
3. a kind of wearable ECG lead-fail detector detection device according to claim 2, it is characterised in that：Described first surveys
Amount electrode and the second measuring electrode corresponding to measuring point be both hands, front and other there are the positions of electrocardio potential difference.
4. a kind of wearable ECG lead-fail detector detection device according to claim 1, it is characterised in that：The detection dress
It further includes super low-power consumption lead level detection unit (6) to set；The signal output end of the direct current lead-fail detector detection unit (2) with
The signal input part of super low-power consumption lead level detection unit (6) connects；The super low-power consumption lead level detection unit (6)
Signal output end is connect with the signal input part of processor unit (5)；The signal output end and direct current of the processor unit (5)
The signal input part of lead-fail detector detection unit (2) connects.
5. a kind of wearable ECG lead-fail detector detection device according to claim 1, it is characterised in that：The detection dress
It further includes positive reverse phase waveform generator (7) to set；The signal output end of the processor unit (5) and positive reverse phase sinusoidal waveform
The signal input part of generator (7) connects；The signal output end of the positive reverse phase waveform generator (7) takes off with lead is exchanged
Fall the signal input part connection of detection unit (3).
6. a kind of wearable ECG lead-fail detector detection method：It mainly includes the following steps that,
Step 1, when without using lead, electrode incoming level is higher than threshold voltage, and processor (5) enables direct current lead-fail detector
Detection unit (2) and super low-power consumption lead level detection unit (6) simultaneously close off signal gathering unit (4), exchange lead-fail detector
Detection unit (3) and positive reverse phase waveform generator (7) make oneself to enter the standby mode of extremely low power dissipation；
Step 2, when there is electrode to be connected to human body (1), when electrode incoming level is less than threshold voltage, super low-power consumption lead level
Detection unit (6) exports wake-up signal and gives processor unit (5)；
Step 3, after processor unit (5) is waken up, enabling signal collecting unit (4), and it is single to close the detection of direct current lead-fail detector
First (2) and super low-power consumption lead level detection unit (6) are then opening exchange lead-fail detector detection unit (3) and positive reverse phase just
String waveform generator (7) acquires signal；
Step 4, during signal acquisition, exchange lead-fail detector detection unit (3), positive reverse phase sine-wave generator (7), signal are adopted
Collect unit (4) and processor unit (5) is in operating status；In the meantime, equipment is in exchange lead-fail detector detection pattern,
Signal of processor unit (5) processing from signal gathering unit (4) simultaneously obtains electrocardiogram (ECG) data and lead-fail detector situation；
Step 5, if lead-fail detector occurs during signal acquisition, processor unit (5) is single by exchanging lead-fail detector detection
First (3) find to be restored to the state described in step 1 after the situation, that is, are first shut off exchange lead-fail detector detection unit (3)
With positive reverse phase waveform generator (7), direct current lead-fail detector detection unit (2) and the inspection of super low-power consumption lead level are then opened
Unit (6) is surveyed, signal gathering unit (4) is then turned off, last processor unit (5) enters the standby mode of extremely low power dissipation.
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| CN201810453348.4A CN108663596B (en) | 2018-05-14 | 2018-05-14 | Wearable electrocardiograph lead falling-off detection device and detection method |
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| CN201810453348.4A CN108663596B (en) | 2018-05-14 | 2018-05-14 | Wearable electrocardiograph lead falling-off detection device and detection method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111616698A (en) * | 2020-06-22 | 2020-09-04 | 广州迪茂信息科技有限公司 | Dynamic electrocardiograph recorder lead abnormity processing circuit |
| CN112450940A (en) * | 2019-09-06 | 2021-03-09 | Oppo广东移动通信有限公司 | Electrocardio detection device, chip, method and wearable electronic equipment |
| EP3854304A4 (en) * | 2019-11-29 | 2021-07-28 | Shenzhen Goodix Technology Co., Ltd. | Detection circuit, electrocardiogram measurement apparatus, and wearable device |
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