CN108888262A - Exchange lead-fail detector detection circuit and method for bipolar electrode ECG Gathering System - Google Patents
Exchange lead-fail detector detection circuit and method for bipolar electrode ECG Gathering System Download PDFInfo
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- CN108888262A CN108888262A CN201810880472.9A CN201810880472A CN108888262A CN 108888262 A CN108888262 A CN 108888262A CN 201810880472 A CN201810880472 A CN 201810880472A CN 108888262 A CN108888262 A CN 108888262A
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
- A61B5/316—Modalities, i.e. specific diagnostic methods
- A61B5/318—Heart-related electrical modalities, e.g. electrocardiography [ECG]
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Abstract
The present invention relates to a kind of exchange lead-fail detector detection circuits and method for bipolar electrode ECG Gathering System, including relaxor, rectifier, hysteresis comparator, non-essential resistance, first resistor, second resistance, first capacitor and the second capacitor；Two outputs of ac small signal current source are connected respectively on two electrodes of ecg amplifier input terminal；Non-essential resistance both ends are connected on two electrodes of ecg amplifier input terminal；The relaxor both ends are connected on two electrodes of ecg amplifier input terminal；The one of electrode of ecg amplifier connects rectifier with first resistor by first capacitor, another electrode of the ecg amplifier connects rectifier with second resistance by the second capacitor；The rectifier is connect with hysteresis comparator positive input terminal.Present invention employs the high reliability that the method for exchange detection ensure that system, save circuit area, advantageously reduce system power dissipation, meet the requirement of lead-fail detector detection, avoid abnormal signal problem caused by lead-fail detector.
Description
Technical field
The present invention relates to and ecg signal acquiring, process field, and in particular to one kind be used for bipolar electrode ECG Gathering System
Exchange lead-fail detector detection circuit and method.
Background technique
Acquisition electrocardiosignal usually requires electrode connection, if lead-fail detector or poor contact will lead to collected electrocardio
Abnormal signal influences normal medical diagnosis.And it is difficult when lead poor contact through human eye or micro-judgment, therefore lead
The detection that falls off is the essential module of ECG Gathering System.
Direct current lead-fail detector detection pattern is only applicable to three-electrode configuration, and when using two electrodes, exchange lead is de-
It is highly useful to fall detection pattern.And the major defect of existing exchange lead-fail detector detection circuit is that module is more, circuit is complicated, is caused
Circuit area is big, power consumption is high, there may be certain rate of false alarms, is unfavorable for electrocardiogram acquisition equipment small area, low power dissipation design.
Summary of the invention
In view of this, the purpose of the present invention is to provide a kind of exchange lead-fail detectors for bipolar electrode ECG Gathering System
Detection circuit overcomes the case where lead during ecg signal acquiring surprisingly falls off, can integrated level it is high, electrocardio has been effectively ensured
The normal work of acquisition system.
To achieve the above object, the present invention adopts the following technical scheme that：
A kind of exchange lead-fail detector detection circuit for bipolar electrode ECG Gathering System, including relaxor, rectifier, late
Stagnant comparator, non-essential resistance, first resistor, second resistance, first capacitor and the second capacitor；Two of ac small signal current source
Output is connected respectively on two electrodes of ecg amplifier input terminal；Non-essential resistance both ends are connected to ecg amplifier input terminal
Two electrodes on；The relaxor both ends are connected on two electrodes of ecg amplifier input terminal；The electrocardio is put
The big one of electrode of device connects rectifier with first resistor by first capacitor, another electrode of the ecg amplifier passes through
Second capacitor connects rectifier with second resistance；The rectifier is connect with hysteresis comparator positive input terminal.
Further, the frequency of oscillation expression formula of the relaxor is：
;
WhereinCFor the capacitance of charging capacitor,V H For high level,V L For low level,I b For bias current.
Further, the resistance value of the non-essential resistance is about 10 M Ω.
Further, two square wave low current signals of the relaxation oscillator output are identical.
Further, the first resistor is equal with the resistance value of second resistance, the capacitance phase of first capacitor and the second capacitor
Deng.
Further, the rectifier is current-mode nesting full-wave rectifier.
Further, a method of the exchange lead-fail detector detection circuit for bipolar electrode ECG Gathering System
Step S1:Ac small signal current source is made of relaxor, is generated a square-wave voltage, is then converted to
Square wave low current signal；
Step S2：Square wave low current signal is converted to alternating voltage by the non-essential resistance；
Step S3:Alternating voltage is converted to DC voltage by the rectifier, and is exported to hysteresis comparator；
Step S4:Received DC voltage is compared by the hysteresis comparator with the reference voltage set, by comparing
As a result judge whether lead falls off, be that then lead-fail detector occurs to high level in decision circuitry when hysteresis comparator exports, otherwise
Lead is not fallen off.
The present invention has the advantages that compared with prior art：
Present invention employs the detections that the method for exchange detection realizes ECG Gathering System lead-fail detector, and structure complexity is not high,
The high reliability that ensure that system, saves circuit area, advantageously reduces system power dissipation, meets bipolar electrode ECG Gathering System
The requirement of lead-fail detector detection, the problems such as effectively preventing abnormal signal caused by lead-fail detector.
Detailed description of the invention
Fig. 1 is circuit overall architecture of the present invention；
Fig. 2 is overhaul flow chart of the present invention；
In figure：1- relaxor, 2- ecg amplifier, 3- rectifier, 4- hysteresis comparator.
Specific embodiment
The present invention will be further described with reference to the accompanying drawings and embodiments.
Please refer to Fig. 1, the present invention provides one kind and please refers to Fig. 1 the present embodiment provides one kind for bipolar electrode electrocardiogram acquisition system
The exchange lead-fail detector detection circuit of system, including relaxor 1, rectifier 3, hysteresis comparator 4, non-essential resistanceR, first electricity
ResistanceR 1, second resistanceR 2, first capacitorC 1With the second capacitorC 2；Two outputs of ac small signal current source are connected respectively to the heart
On two electrodes of 2 input terminal of electric amplifier；Non-essential resistanceRBoth ends are connected on two electrodes of 2 input terminal of ecg amplifier；
1 both ends of relaxor are connected on two electrodes of 2 input terminal of ecg amplifier；2 positive electrode of ecg amplifier
Pass through first capacitorC 1And first resistorR 1It is connected to rectifier 3,2 negative electrode of ecg amplifier passes through the second capacitorC 2With
Second resistanceR 2It is connected to rectifier 3；The rectifier 3 is connect with 4 positive input terminal of hysteresis comparator.
In an embodiment of the present invention, the frequency of oscillation expression formula of the relaxor 1 is：
;
WhereinCFor the capacitance of charging capacitor,V H For high level,V L For low level,I b For bias current.
In an embodiment of the present invention, the non-essential resistanceRResistance value be about 10 M Ω.
In an embodiment of the present invention, two square wave low current signals that the relaxation oscillator 1 exports are identical.
In an embodiment of the present invention, the first resistorR 1With second resistanceR 2Resistance value is equal, first capacitorC 1With second
CapacitorC 2Capacitance it is equal.
In an embodiment of the present invention, the rectifier 3 is current-mode nesting full-wave rectifier.
In an embodiment of the present invention, the relaxation oscillator 1 and hysteresis comparator 4 are replaced by other types of vibration
Swing device and comparator.
In an embodiment of the present invention, a kind of exchange lead-fail detector detection circuit for bipolar electrode ECG Gathering System
Method
Step S1:Ac small signal current source is made of relaxor, generates a square-wave voltage, then the side of being converted to
Wave low current signal；
Step S2：Square wave low current signal is converted to alternating voltage by the non-essential resistance；
Step S3:Alternating voltage is converted to DC voltage by the rectifier, and is exported to hysteresis comparator；
Step S4:Received DC voltage is compared by the hysteresis comparator with the reference voltage set, by comparing
As a result judge whether lead falls off, be that then lead-fail detector occurs to high level in decision circuitry when hysteresis comparator exports, otherwise
Lead is not fallen off.
The foregoing is merely presently preferred embodiments of the present invention, all equivalent changes done according to scope of the present invention patent with
Modification, is all covered by the present invention.
Claims (6)
1. a kind of exchange lead-fail detector detection circuit for bipolar electrode ECG Gathering System, it is characterised in that：It shakes including relaxation
Swing device, rectifier, hysteresis comparator, non-essential resistance, first resistor, second resistance, first capacitor and the second capacitor；Exchange small letter
Two outputs of number current source are connected respectively on two electrodes of ecg amplifier input terminal；Non-essential resistance both ends are connected to the heart
On two electrodes of electric amplifier input terminal；The relaxor both ends are connected to two electrodes of ecg amplifier input terminal
On；The one of electrode of ecg amplifier connects rectifier, the ecg amplifier with first resistor by first capacitor
Another electrode connects rectifier with second resistance by the second capacitor；The rectifier and hysteresis comparator positive input terminal connect
It connects.
2. a kind of exchange lead-fail detector detection circuit for bipolar electrode ECG Gathering System according to claim 1,
It is characterized in that：The frequency of oscillation expression formula of the relaxor is：
;
WhereinCFor the capacitance of charging capacitor,V H For high level,V L For low level,I b For bias current.
3. a kind of exchange lead-fail detector detection circuit for bipolar electrode ECG Gathering System according to claim 1,
It is characterized in that：The resistance value of the non-essential resistance is 10 M Ω.
4. a kind of exchange lead-fail detector detection circuit for bipolar electrode ECG Gathering System according to claim 1,
It is characterized in that：The first resistor is equal with the resistance value of second resistance, and first capacitor is equal with the capacitance of the second capacitor.
5. a kind of exchange lead-fail detector detection circuit for bipolar electrode ECG Gathering System according to claim 1,
It is characterized in that：The rectifier is current-mode nesting full-wave rectifier.
6. a kind of side of exchange lead-fail detector detection circuit for bipolar electrode ECG Gathering System according to claim 1
Method, it is characterised in that：
Step S1:Ac small signal current source is made of relaxor, is generated a square-wave voltage, is then converted to
Square wave low current signal；
Step S2：Square wave low current signal is converted to alternating voltage by the non-essential resistance；
Step S3:Alternating voltage is converted to DC voltage by the rectifier, and is exported to hysteresis comparator；
Step S4:Received DC voltage is compared by the hysteresis comparator with the reference voltage set, by comparing
As a result judge whether lead falls off, be that then lead-fail detector occurs to high level in decision circuitry when hysteresis comparator exports, otherwise
Lead is not fallen off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810880472.9A CN108888262B (en) | 2018-08-04 | 2018-08-04 | Alternating current lead falling detection circuit and method for double-electrode electrocardio acquisition system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810880472.9A CN108888262B (en) | 2018-08-04 | 2018-08-04 | Alternating current lead falling detection circuit and method for double-electrode electrocardio acquisition system |
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| CN108888262A true CN108888262A (en) | 2018-11-27 |
| CN108888262B CN108888262B (en) | 2023-08-04 |
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Cited By (3)
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| CN108663596A (en) * | 2018-05-14 | 2018-10-16 | 无锡商业职业技术学院 | A kind of wearable ECG lead-fail detector detection device and detection method |
| CN112741633A (en) * | 2019-10-31 | 2021-05-04 | 深圳市理邦精密仪器股份有限公司 | Electrocardiosignal detection system and electrocardiosignal detection equipment |
| CN114224349A (en) * | 2021-12-10 | 2022-03-25 | 深圳市汇顶科技股份有限公司 | Contact state detection device and wearable equipment |
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| CN108663596A (en) * | 2018-05-14 | 2018-10-16 | 无锡商业职业技术学院 | A kind of wearable ECG lead-fail detector detection device and detection method |
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| CN114224349B (en) * | 2021-12-10 | 2023-12-19 | 深圳市汇顶科技股份有限公司 | Contact state detection device and wearable equipment |
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| CN108888262B (en) | 2023-08-04 |
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