CN113057638B - Limb conduction and central potential signal acquisition circuit, electrocardiosignal acquisition system and method - Google Patents
Limb conduction and central potential signal acquisition circuit, electrocardiosignal acquisition system and method Download PDFInfo
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- CN113057638B CN113057638B CN202110309015.6A CN202110309015A CN113057638B CN 113057638 B CN113057638 B CN 113057638B CN 202110309015 A CN202110309015 A CN 202110309015A CN 113057638 B CN113057638 B CN 113057638B
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Abstract
The invention discloses a limb conduction and central potential signal acquisition circuit, an electrocardiosignal acquisition system and a method. The system comprises: the chest lead signal acquisition circuit comprises at least three signal acquisition electrodes, a chest lead signal acquisition circuit, a differential circuit and a central potential signal acquisition circuit; the signal acquisition electrodes are connected with the limb conduction signal input ends in a one-to-one correspondence manner; the first input end of the differential circuit is connected with the output end of the central potential signal acquisition circuit, the second input end of the differential circuit is connected with the output end of the chest lead signal acquisition circuit, and the output end of the differential circuit is used as the output end of the electrocardiosignal acquisition system. By the electrocardiosignal acquisition system provided by the technical scheme of the embodiment of the invention, the anti-interference capability and the signal accuracy of electrocardiosignal acquisition are improved.
Description
Technical Field
The embodiment of the invention relates to the technical field of medical electrocardiosignal monitoring, in particular to a limb conduction and central potential signal acquisition circuit, an electrocardiosignal acquisition system and a method.
Background
Electrocardio (ECG for short) signals are the reflection of the electrical activity of the heart within a period of time, are collected by the skin electrode, and then the skin electrode is connected with the electrocardio lead wire to transmit the electrocardio signals to the electrocardio measuring circuit. Skin electrodes are generally placed on the extremities and chest, etc.
At present, the common 12-lead electrocardiogram adopts a mode of taking a central point by a Wilson central network to carry out chest lead electrocardiogram acquisition, but if one limb lead of the leads is interfered when the electrocardiogram is used, the interference of the whole chest lead is increased, and the acquired electrocardiogram signals are inaccurate.
Disclosure of Invention
The invention provides a limb conduction and center potential signal acquisition circuit, an electrocardiosignal acquisition system and a method, which aim to improve the anti-interference capability and signal accuracy of electrocardiosignal acquisition.
In a first aspect, an embodiment of the present invention provides a limb conduction signal acquisition circuit, including: at least three limb conduction signal input ends, a selection switch and a resistor; the first end of the selector switch is electrically connected with the limb conduction signal input end, the second end of the selector switch is electrically connected with one end of the resistor, the other end of the resistor is used as the output end of the limb conduction signal acquisition circuit, and the third end of the selector switch is electrically connected with the control component; the control part is respectively connected with each limb conduction signal input end and is used for determining a collected target limb conduction signal according to the limb conduction signal input by each limb conduction signal input end, generating a control signal of the selection switch and sending the control signal to the selection switch;
the selection switch adjusts the connection state of each limb conduction signal input end according to the control signal of the control part so as to output the target limb conduction signal;
the resistor is used for adjusting the output current of the target limb conduction signal.
In a second aspect, an embodiment of the present invention further provides a center potential signal acquisition circuit, where the center potential signal acquisition circuit includes: a control component, a capacitor and at least three limb conduction signal acquisition circuits as described in any of the above embodiments;
the input end of each limb conduction signal acquisition circuit is used as each input end of the central potential signal acquisition circuit, and the number of the limb conduction signal input ends is the same as that of the limb conduction signal acquisition circuits;
the control part is respectively electrically connected with the limb conduction signal input end and the selection switch in each limb conduction signal acquisition circuit, and is used for generating a control signal of the selection switch according to the limb conduction signal acquired by each limb conduction signal input end in each limb conduction signal acquisition circuit and sending the control signal to the selection switch of each limb conduction signal acquisition circuit;
each limb conduction signal acquisition circuit is used for adjusting the on state of the selection switch according to the control signal and outputting a target limb conduction signal;
one end of the capacitor is electrically connected with the output end of each limb conduction signal acquisition circuit respectively, the target limb conduction signal output by each limb conduction signal acquisition circuit is subjected to filtering processing, and the other end of the capacitor is used as the output end of the central potential signal acquisition circuit to output a central potential signal.
In a third aspect, an embodiment of the present invention further provides an electrocardiographic signal acquisition system, where the electrocardiographic signal acquisition system includes: at least three signal acquisition electrodes, a chest lead signal acquisition circuit, a differential circuit and the central potential signal acquisition circuit of any of the above embodiments; the signal acquisition electrodes are connected with the limb conduction signal input ends in a one-to-one correspondence manner; the first input end of the differential circuit is connected with the output end of the central potential signal acquisition circuit, the second input end of the differential circuit is connected with the output end of the chest lead signal acquisition circuit, and the output end of the differential circuit is used as the output end of the electrocardiosignal acquisition system;
the signal acquisition electrode is used for acquiring limb conduction signals;
the central potential signal acquisition circuit determines a central potential signal according to the input limb conduction signal;
the chest lead signal acquisition circuit is used for outputting the chest lead signal;
the difference circuit is used for determining the electrocardiosignal according to the central potential signal and the chest lead signal.
In a fourth aspect, an embodiment of the present invention further provides an electrocardiograph signal acquisition method, where the method includes:
based on the control part receiving the limb conduction signals input by the limb conduction signal input ends, carrying out state verification on the received limb conduction signals; determining target limb conduction signals acquired by each limb conduction signal acquisition circuit according to the states of the limb conduction signals, and generating control signals of each limb conduction signal acquisition circuit based on the target limb conduction signals of the limb conduction signal acquisition circuits, wherein the control signals are used for controlling a selection switch in the corresponding limb conduction signal acquisition circuit to switch the connection state so as to output the target limb conduction signals;
collecting each limb conduction signal based on the limb conduction signal collecting circuit and outputting a target limb conduction signal;
determining a central potential signal according to the input limb conduction signal based on a central potential signal acquisition circuit;
outputting the chest lead signal based on a chest lead signal acquisition circuit;
and determining an electrocardiosignal according to the central potential signal and the chest lead signal based on a differential circuit.
According to the technical scheme of the embodiment of the invention, each limb guide signal input based on the limb guide signal input end is input to the control part, the target limb guide signal acquired by each limb guide signal acquisition circuit is determined based on the state of each limb guide signal acquired by the control part according to the state of each limb guide signal, and the control signal of each limb guide signal acquisition circuit is generated and used for controlling the selection switch in the corresponding limb guide signal acquisition circuit to switch the connection state so as to output the target limb guide signal. According to the technical scheme of the embodiment of the invention, the target limb conduction signals with stable states are output, so that the central potential signals are determined according to the target limb conduction signals, and the electrocardiosignals are determined according to the central potential signals and the chest conduction signals, so that the interference resistance and the signal accuracy of electrocardiosignal acquisition are improved.
Drawings
In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, a brief description is given below of the drawings used in describing the embodiments. It should be clear that the described figures are only views of some of the embodiments of the invention to be described, not all, and that for a person skilled in the art, other figures can be derived from these figures without inventive effort.
Fig. 1 is a structural diagram of a limb conduction signal acquisition circuit according to an embodiment of the present invention;
FIG. 2 is a block diagram of another limb conduction signal acquisition circuit according to an embodiment of the present invention;
fig. 3 is a structural diagram of a center potential signal acquisition circuit according to a second embodiment of the present invention;
fig. 4 is a structural diagram of an electrocardiographic signal acquisition system according to a third embodiment of the present invention;
fig. 5 is a flowchart of an electrocardiographic signal acquisition method according to a fourth embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1 is a structural diagram of a limb conduction signal acquisition circuit according to an embodiment of the present invention, and this embodiment is applicable to a case of acquiring a cardiac electrical signal. As shown in fig. 1, the circuit 101 is electrically connected to the control unit 102, and the circuit 101 includes the following structure: at least three limb conduction signal inputs 110, a selection switch 120 and a resistor 130;
a first end of the selector switch 120 is electrically connected to the limb conduction signal input terminal 110, a second end of the selector switch 120 is electrically connected to one end of the resistor 130, the other end of the resistor 130 serves as an output end of the limb conduction signal acquisition circuit 101, and a third end of the selector switch 120 is electrically connected to the control component 102; the control part 102 is respectively connected to each limb conduction signal input end 110, and is configured to determine an acquired target limb conduction signal according to the limb conduction signal input by each limb conduction signal input end 110, generate a control signal of the selector switch 120, and send the control signal to the selector switch 120; the selection switch 120 adjusts the connection state with each limb conductance signal input terminal 110 according to the control signal of the control part 102 to output the target limb conductance signal; resistor 130 is used to adjust the output current of the target limb conduction signal.
Optionally, the limb lead signal input terminal 110 of the limb lead signal acquisition circuit 101 includes at least three input terminals, for example, a Left upper limb Lead (LA) input terminal, a Right upper limb lead (RA) input terminal, and a Left lower Limb Lead (LL) input terminal. Each limb lead input terminal 110 is used for collecting each limb lead input by each limb lead and inputting each limb lead to the control unit 102. The control unit 102 detects each limb conduction signal when receiving each limb conduction signal, determines whether each limb conduction signal is abnormal, and generates a control signal according to a limb conduction signal in a normal state if any limb conduction signal acquired by any limb conduction signal acquisition circuit is in an abnormal state, wherein the control signal is randomly generated based on any one of the limb conduction signals in the normal state. And if all the limb conduction signals are in a normal state, determining a target limb conduction signal of the current limb conduction of the limb conduction signal acquisition circuit, and generating a control signal corresponding to each limb conduction signal acquisition circuit based on the target limb conduction signal of the current limb conduction. The control signal generated by the control component 102 is transmitted to the selector switch 120 in the limb conduction signal acquisition circuit 101. The selection switch 120 adjusts the switch state of each limb conduction signal input end according to the control signal transmitted by the control part 102 so as to output the target limb conduction signal of the limb conduction signal acquisition circuit.
According to the limb conduction signal acquisition circuit provided by the embodiment of the invention, each limb conduction signal input by the limb conduction signal input end 110 is input to the control part 102, and the target limb conduction signal acquired by each limb conduction signal acquisition circuit 101 is determined based on the state of each limb conduction signal of the control part 102, so as to generate the control signal of each limb conduction signal acquisition circuit, wherein the control signal is used for controlling the selection switch 120 in the corresponding limb conduction signal acquisition circuit 101 to switch the connection state, so as to output the target limb conduction signal. According to the technical scheme of the embodiment of the invention, the target limb conduction signal with a stable state is output by the limb conduction signal acquisition circuit, so that the central potential signal with a stable state output by the central potential signal acquisition circuit is determined according to each target limb conduction signal in the process of acquiring the electrocardiosignals, more accurate electrocardiosignals are determined according to the central potential signal of the central potential signal acquisition circuit and the chest conduction signal of the chest conduction signal acquisition circuit, and the anti-interference capability and the signal accuracy of electrocardiosignal acquisition are improved.
On the basis of the foregoing embodiment, another limb conduction signal acquisition circuit is further provided in the embodiment of the present invention, and the limb conduction signal acquisition circuit further includes an operational amplifier sub-circuit 140, specifically as shown in fig. 2, a first input terminal of the operational amplifier sub-circuit 140 is connected to a second terminal of the selection switch 420, a second input terminal of the operational amplifier sub-circuit 140 is connected to an output terminal of the operational amplifier sub-circuit 140, and an output terminal of the operational amplifier sub-circuit 140 is connected to a first terminal of the resistor 130; the operational amplifier sub-circuit 140 is configured to amplify the target limb conduction signal output by the selection switch 120 to control the voltage of the target limb conduction signal.
Example two
Fig. 3 is a structural diagram of a center potential signal acquisition circuit according to a second embodiment of the present invention, which is applicable to the acquisition of a center potential signal. Wherein explanations of the same or corresponding terms as those of the above embodiments are omitted. Referring to fig. 3, the center potential signal acquisition circuit 200 provided in the present embodiment includes: a control component 202, a capacitor 203 and at least three limb conduction signal acquisition circuits 201 as described in any of the above embodiments;
the input end of each limb conduction signal acquisition circuit 201 is used as each input end of the central potential signal acquisition circuit 200, and the number of the limb conduction signal input ends 210 is the same as that of the limb conduction signal acquisition circuits 201; the control component 202 is electrically connected to the limb conduction signal input end 210 and the selection switch 220 of each limb conduction signal acquisition circuit 201, and is configured to generate a control signal of the selection switch 220 according to the limb conduction signal acquired by each limb conduction signal input end 210 of each limb conduction signal acquisition circuit 201, and send the control signal to the selection switch 220 of each limb conduction signal acquisition circuit 201; each limb conduction signal acquisition circuit 201 is used for adjusting the on state of the selection switch 220 according to the control signal and outputting a target limb conduction signal; one end of the capacitor 203 is electrically connected to the output end of each limb conduction signal acquisition circuit 201, and is used for filtering the target limb conduction signal output by each limb conduction signal acquisition circuit 201, and the other end of the capacitor is used as the output end of the central potential signal acquisition circuit 200 to output a central potential signal.
Specifically, the central potential signal acquisition circuit 200 includes at least three limb conduction signal acquisition circuits 201, and is configured to acquire each target limb conduction signal output by each limb conduction signal acquisition circuit 201 based on the control signal generated by the control component 202. Wherein, the number of limb leads signal input end with the same beneficial effect of limb leads signal acquisition circuit number lies in: and each limb conduction signal acquisition circuit can output a stable target limb conduction signal when all limb conduction signal input ends are in a normal state.
The central potential signal acquisition circuit 200 is configured to calculate each target limb conduction signal output by each limb conduction signal acquisition circuit 201 to obtain a central potential signal.
Illustratively, the control unit 202 detects each limb lead signal input by each limb lead signal input end 210 of each limb lead signal acquisition circuit, determines the signal state of each limb lead signal acquired by each limb lead signal acquisition circuit, and generates a control signal according to any limb lead signal in a normal state if any limb lead signal acquired by any limb lead signal acquisition circuit is in an abnormal state, wherein the control signal is randomly generated based on any one of the limb lead signals in the normal state. The control signal is sent to the selection switch 220 of each limb conduction signal acquisition circuit 201, and the selection switch 220 generates the target limb conduction signal of each limb conduction signal acquisition circuit 201 based on the control signal transmitted by the control component 202. That is, when the control unit detects that the RA signal acquired by the limb conduction signal acquisition circuit is in an abnormal state, the control signal of all the limb conduction signal acquisition circuits is generated to be the LA signal or the LL signal, and is transmitted to the selection switch 220 of the limb conduction signal acquisition circuit 201, and the selection switch 220 generates the LA signal or the LL signal of each limb conduction signal acquisition circuit 201 as the target limb conduction signal based on the control signal transmitted by the control unit 202.
The center potential signal acquisition circuit provided in the embodiment of the present invention is electrically connected to the limb conduction signal input end 210 and the selection switch 220 of each limb conduction signal acquisition circuit 201 through the control component 202, and is configured to generate a control signal of the selection switch 220 according to a limb conduction signal acquired by each limb conduction signal input end 210 of each limb conduction signal acquisition circuit 201, and send the control signal to the selection switch 220 of each limb conduction signal acquisition circuit 201; each limb conduction signal acquisition circuit 201 is used for adjusting the on state of the selection switch 220 according to the control signal and outputting a target limb conduction signal; and determines the central potential signal of the central potential signal acquisition circuit 200 according to each target limb conduction signal of at least three limb conduction signal acquisition circuits 201. According to the technical scheme of the embodiment of the invention, the stable-state target limb lead signals are output, the stable-state central potential signals are determined according to the target limb lead signals, and more accurate electrocardiosignals are determined according to the central potential signals and the chest lead signals, so that the anti-interference capability and the signal accuracy of electrocardiosignal acquisition are improved.
EXAMPLE III
Fig. 4 is a structural diagram of an electrocardiographic signal acquisition system according to a third embodiment of the present invention, which is applicable to acquiring electrocardiographic signals. Wherein explanations of the same or corresponding terms as those of the above embodiments are omitted. Referring to fig. 4, the system 300 for acquiring an ecg signal provided in this embodiment includes: at least three signal collecting electrodes 303, a chest lead signal collecting circuit 304, a differential circuit 305, and a central potential signal collecting circuit 306 according to any of the above embodiments; wherein, the first and the second end of the pipe are connected with each other,
the signal acquisition electrodes 303 are connected with the limb conduction signal input ends 310 in a one-to-one correspondence manner; a first input end of the differential circuit 305 is connected to the output end of the central potential signal acquisition circuit 306, a second input end of the differential circuit 305 is connected to the output end of the chest lead signal acquisition circuit 304, and the output end of the differential circuit 305 serves as the output end of the electrocardiograph signal acquisition system 300; the signal acquisition electrode 303 is used for acquiring a limb conduction signal; the central potential signal acquisition circuit 306 determines a central potential signal according to the input limb conduction signal; the chest lead signal acquisition circuit 304 is used for outputting the chest lead signal; the difference circuit 305 is configured to determine an electrocardiographic signal according to the central potential signal and the chest lead signal.
In the electrocardiograph signal acquisition system provided in the embodiment of the present invention, the control component 302 in the central potential signal acquisition circuit 306 is electrically connected to the limb conduction signal input end 310 and the selection switch 320 in each limb conduction signal acquisition circuit 301, respectively, and is configured to generate a control signal of the selection switch 320 according to the limb conduction signal acquired by each limb conduction signal input end 310 in each limb conduction signal acquisition circuit 306, and send the control signal to the selection switch 320 of each limb conduction signal acquisition circuit 301; each limb conduction signal acquisition circuit 301 is configured to adjust the on state of the selection switch 320 according to the control signal, and output a target limb conduction signal; determining a central potential signal of the central potential signal acquisition circuit 306 according to each target limb conduction signal of at least three limb conduction signal acquisition circuits 301; outputting the chest lead signal based on the chest lead signal acquisition circuit 304; the difference-based circuit 305 determines an electrocardiographic signal from the center potential signal and the chest lead signal. According to the technical scheme of the embodiment of the invention, the anti-interference capability and the signal accuracy of electrocardiosignal acquisition are improved by outputting the target limb lead signals with stable states, determining the central potential signals according to the target limb lead signals and determining the electrocardiosignals according to the central potential signals and the chest lead signals.
The following is an embodiment of the electrocardiographic signal acquisition method provided by the embodiment of the present invention, which belongs to the same inventive concept as the above embodiments, and reference may be made to the above embodiments for details that are not described in detail in the embodiment of the electrocardiographic signal acquisition method.
Example four
Fig. 5 is a schematic flow chart of the electrocardiograph signal acquisition method according to the fourth embodiment of the present invention, which is applicable to the electrocardiograph signal acquisition. The method can be executed by the electrocardiosignal acquisition system provided by the above embodiment, and the system can be realized by software and/or hardware. Referring to fig. 5, the signal acquisition method includes the following specific steps:
s410, receiving limb conduction signals input by the limb conduction signal input ends based on the control part, and carrying out state verification on the received limb conduction signals; and determining target limb conduction signals acquired by each limb conduction signal acquisition circuit according to the states of the limb conduction signals, and generating control signals of each limb conduction signal acquisition circuit based on the target limb conduction signals of the limb conduction signal acquisition circuits, wherein the control signals are used for controlling a selection switch in the corresponding limb conduction signal acquisition circuit to switch the connection state so as to output the target limb conduction signals.
And S420, acquiring each limb conduction signal based on the limb conduction signal acquisition circuit and outputting a target limb conduction signal.
And S430, determining a central potential signal according to the input limb conduction signal based on the central potential signal acquisition circuit.
And S440, outputting the chest lead signal based on a chest lead signal acquisition circuit.
S450, determining an electrocardiosignal according to the central potential signal and the chest lead signal based on a differential circuit.
According to the electrocardiosignal acquisition method provided by the embodiment of the invention, the control component receives the limb conduction signals input by the input end of each limb conduction signal, and the state of the received limb conduction signals is verified; determining target limb conduction signals acquired by each limb conduction signal acquisition circuit according to the states of the limb conduction signals, and generating control signals of each limb conduction signal acquisition circuit based on the target limb conduction signals of the limb conduction signal acquisition circuits, wherein the control signals are used for controlling a selection switch in the corresponding limb conduction signal acquisition circuit to switch the connection state so as to output the target limb conduction signals; the target limb conduction signals in a stable output state are output, then the central potential signals are determined according to the target limb conduction signals, the electrocardiosignals are determined according to the central potential signals and the chest conduction signals, and therefore the anti-interference capability and the signal accuracy of electrocardiosignal acquisition are improved.
On the basis of the above embodiment, in the embodiment of the present invention, the determining, according to the state of each limb conduction signal, a target limb conduction signal acquired by each limb conduction signal acquisition circuit, and generating a control signal of each limb conduction signal acquisition circuit based on the target limb conduction signal of the limb conduction signal acquisition circuit includes: and if any one of the limb conduction signals acquired by any one of the limb conduction signal acquisition circuits is in an abnormal state, generating a control signal according to the limb conduction signal in a normal state, and sending the control signal to each limb conduction signal acquisition circuit, wherein the control signal is generated randomly based on any one of the limb conduction signals in the normal state.
On the basis of the above embodiment, in the embodiment of the present invention, the determining, according to the state of each limb conduction signal, a target limb conduction signal acquired by each limb conduction signal acquisition circuit, and generating a control signal of each limb conduction signal acquisition circuit based on the target limb conduction signal of the limb conduction signal acquisition circuit includes: and if all the limb conduction signals acquired by all the limb conduction signal acquisition circuits are in a normal state, determining different target limb conduction signals of all the limb conduction signal acquisition circuits, and generating control signals corresponding to all the limb conduction signal acquisition circuits based on the different target limb conduction signals.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (9)
1. A limb conduction signal acquisition circuit, electrically connected to a control unit, the limb conduction signal acquisition circuit comprising: at least three limb conduction signal input ends, a selection switch and a resistor; the first end of the selector switch is electrically connected with the limb conduction signal input end, the other end of the resistor is used as the output end of the limb conduction signal acquisition circuit, and the third end of the selector switch is electrically connected with the control component; the control part is respectively connected with each limb conduction signal input end, and is used for determining a collected target limb conduction signal according to the limb conduction signal input by each limb conduction signal input end, generating a control signal of the selection switch, and sending the control signal to the selection switch;
the selection switch adjusts the connection state of each limb conduction signal input end according to the control signal of the control part so as to output the target limb conduction signal;
the resistor is used for adjusting the output current of the target limb conduction signal;
the limb conduction signal acquisition circuit also comprises an operational amplifier sub-circuit;
a first input end of the operational amplification sub-circuit is connected with a second end of the selection switch, a second input end of the operational amplification sub-circuit is connected with an output end of the operational amplification sub-circuit, and an output end of the operational amplification sub-circuit is connected with a first end of the resistor;
the operational amplification sub-circuit is used for amplifying the target limb conduction signal output by the selection switch so as to control the voltage of the target limb conduction signal.
2. The limb conduction signal acquisition circuit according to claim 1, wherein the control component is specifically configured to detect an abnormal state of each limb conduction signal acquired by each limb conduction signal acquisition circuit;
and if any limb conduction signal acquired by any limb conduction signal acquisition circuit is in an abnormal state, generating a control signal according to the limb conduction signal in a normal state, and sending the control signal to each limb conduction signal acquisition circuit.
3. A limb conduction signal acquisition circuit according to claim 1, wherein the control signal is randomly generated based on any one of the limb conduction signals in a normal state.
4. The limb conduction signal acquisition circuit according to claim 1, wherein the control unit is further configured to:
and if all the limb conduction signals acquired by all the limb conduction signal acquisition circuits are in a normal state, determining different target limb conduction signals of all the limb conduction signal acquisition circuits, and generating control signals corresponding to all the limb conduction signal acquisition circuits based on the different target limb conduction signals.
5. A center potential signal acquisition circuit, comprising: a control component, a capacitor and at least three limb conduction signal acquisition circuits according to any one of claims 1 to 4;
the input end of each limb conduction signal acquisition circuit is used as each input end of the central potential signal acquisition circuit, and the number of the limb conduction signal input ends is the same as that of the limb conduction signal acquisition circuits;
the control part is respectively electrically connected with the limb conduction signal input end and the selection switch in each limb conduction signal acquisition circuit, and is used for generating a control signal of the selection switch according to the limb conduction signal acquired by each limb conduction signal input end in each limb conduction signal acquisition circuit and sending the control signal to the selection switch of each limb conduction signal acquisition circuit;
each limb conduction signal acquisition circuit is used for adjusting the on state of the selection switch according to the control signal and outputting a target limb conduction signal;
one end of the capacitor is electrically connected with the output end of each limb conduction signal acquisition circuit respectively, the target limb conduction signal output by each limb conduction signal acquisition circuit is subjected to filtering processing, and the other end of the capacitor is used as the output end of the central potential signal acquisition circuit to output a central potential signal.
6. An electrocardiographic signal acquisition system, comprising: at least three signal collecting electrodes, a chest lead signal collecting circuit, a differential circuit and a central potential signal collecting circuit as claimed in claim 5; the signal acquisition electrodes are connected with the limb conduction signal input ends in a one-to-one correspondence manner; the first input end of the differential circuit is connected with the output end of the central potential signal acquisition circuit, the second input end of the differential circuit is connected with the output end of the chest lead signal acquisition circuit, and the output end of the differential circuit is used as the output end of the electrocardiosignal acquisition system;
the signal acquisition electrode is used for acquiring limb conduction signals;
the central potential signal acquisition circuit determines a central potential signal according to the input limb conduction signal;
the chest lead signal acquisition circuit is used for outputting the chest lead signal;
the difference circuit is used for determining an electrocardiosignal according to the central potential signal and the chest lead signal;
and amplifying the limb conduction signal to control the voltage of the limb conduction signal.
7. An electrocardiographic signal acquisition method applied to the electrocardiographic signal acquisition system according to claim 6, comprising:
based on the limb conduction signals input by the input ends of the limb conduction signals received by the control part, carrying out state verification on the received limb conduction signals; determining target limb conduction signals acquired by each limb conduction signal acquisition circuit according to the states of the limb conduction signals, and generating control signals of each limb conduction signal acquisition circuit based on the target limb conduction signals of the limb conduction signal acquisition circuits, wherein the control signals are used for controlling a selection switch in the corresponding limb conduction signal acquisition circuit to switch the connection state so as to output the target limb conduction signals;
collecting each limb conduction signal based on the limb conduction signal collecting circuit and outputting a target limb conduction signal;
determining a central potential signal according to the input limb conduction signal based on a central potential signal acquisition circuit;
outputting the chest lead signal based on a chest lead signal acquisition circuit;
determining an electrocardiosignal according to the central potential signal and the chest lead signal based on a differential circuit;
and amplifying the target limb conduction signal to control the voltage of the target limb conduction signal.
8. The method according to claim 7, wherein the determining a target limb conduction signal acquired by each limb conduction signal acquisition circuit according to the state of each limb conduction signal and generating a control signal of each limb conduction signal acquisition circuit based on the target limb conduction signal of each limb conduction signal acquisition circuit comprises:
and if any one of the limb conduction signals acquired by any one of the limb conduction signal acquisition circuits is in an abnormal state, generating a control signal according to the limb conduction signal in a normal state, and sending the control signal to each limb conduction signal acquisition circuit, wherein the control signal is generated randomly based on any one of the limb conduction signals in the normal state.
9. The method according to claim 7, wherein the determining a target limb conduction signal acquired by each limb conduction signal acquisition circuit according to the state of each limb conduction signal and generating a control signal of each limb conduction signal acquisition circuit based on the target limb conduction signal of each limb conduction signal acquisition circuit comprises:
and if all the limb conduction signals acquired by all the limb conduction signal acquisition circuits are in a normal state, determining different target limb conduction signals of all the limb conduction signal acquisition circuits, and generating control signals corresponding to all the limb conduction signal acquisition circuits based on the different target limb conduction signals.
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