CN112741633A

CN112741633A - Electrocardiosignal detection system and electrocardiosignal detection equipment

Info

Publication number: CN112741633A
Application number: CN201911053124.5A
Authority: CN
Inventors: 马锦涛; 邱四海; 饶箭; 罗崇
Original assignee: Edan Instruments Inc
Current assignee: Edan Instruments Inc
Priority date: 2019-10-31
Filing date: 2019-10-31
Publication date: 2021-05-04
Anticipated expiration: 2039-10-31
Also published as: CN112741633B

Abstract

The application discloses electrocardiosignal detecting system and electrocardiosignal collection equipment, this electrocardiosignal detecting system includes: the lead set and the detection circuit are coupled with the lead set, and the lead set at least comprises a first lead, a second lead and a third lead; the detection circuit controls the third lead to be used as a right leg driving lead and controls the first lead and the second lead to collect a first electrocardio signal; or, the detection circuit controls the second lead to be the right leg driving lead and controls the first lead and the third lead to acquire a second cardiac signal. The electrocardiosignal detection system of the application simplifies the number of leads and the lead system by multiplexing the right leg drive leads.

Description

Electrocardiosignal detection system and electrocardiosignal detection equipment

Technical Field

The application relates to the technical field of electrocardiosignal detection, in particular to an electrocardiosignal detection system and electrocardiosignal detection equipment.

Background

For the field of body surface fetal electrocardiogram, the lead quantity and lead placement position of each body surface fetal electrocardiogram detection product are different according to the product. Therefore, it is necessary to design a lead distribution system as compact as possible on the premise of meeting the product performance.

The electrode distribution system of the body surface fetal electrocardiosignal detection device in the industry at present generally adopts a mode that a plurality of signal acquisition lead wires are configured with fixed right leg driving lead wires, the lead quantity of the detection system in the mode is not simplified enough, the detection system is necessary to reduce the burden of a pregnant woman as much as possible when the body surface fetal is monitored, and the less the lead wire quantity, the better the experience of the pregnant woman is.

Disclosure of Invention

The application provides an electrocardiosignal detection system and electrocardiosignal acquisition equipment to solve the problem that the number of leads of the detection system in the prior art is not simplified enough.

In order to solve the above technical problem, a technical scheme adopted in the present application is to provide an electrocardiographic signal detection system, which includes:

the lead set and the detection circuit are coupled with the lead set, and the lead set at least comprises a first lead, a second lead and a third lead;

the detection circuit controls the third lead to be used as a right leg driving lead and controls the first lead and the second lead to collect a first electrocardio signal;

or, the detection circuit controls the second lead to be the right leg driving lead and controls the first lead and the third lead to acquire a second cardiac signal.

In order to solve the technical problem, one technical scheme adopted by the application is to provide an electrocardiosignal acquisition device, wherein the electrocardiosignal acquisition device comprises the electrocardiosignal detection system.

Different from the prior art, the beneficial effects of this application are: the electrocardiosignal detection system of this application includes: the lead set and the detection circuit are coupled with the lead set, and the lead set at least comprises a first lead, a second lead and a third lead; the detection circuit controls the third lead to be used as a right leg driving lead and controls the first lead and the second lead to collect a first electrocardio signal; or, the detection circuit controls the second lead to be the right leg driving lead and controls the first lead and the third lead to acquire a second cardiac signal. The electrocardiosignal detection system of the application simplifies the number of leads and the lead system by multiplexing the right leg drive leads.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic diagram of an embodiment of an ECG signal detection system provided by the present application;

FIG. 2 is a schematic diagram of the electrode system of the embodiment of FIG. 1;

FIG. 3 is a schematic structural diagram of another embodiment of a cardiac signal detection system provided by the present application;

FIG. 4 is a schematic diagram of the structure of the electrode system in the embodiment of FIG. 3;

FIG. 5 is a schematic diagram of an embodiment of an electrical cardiac signal detection circuit provided herein;

FIG. 6 is a schematic structural diagram of an electrode system in the embodiment of FIG. 5;

FIG. 7 is a schematic structural diagram of another embodiment of an electrical cardiac signal detection circuit provided herein;

FIG. 8 is a schematic structural diagram of a further embodiment of an electrical cardiac signal detection circuit as provided herein;

FIG. 9 is a schematic flowchart of an embodiment of a method for detecting an electrocardiographic signal provided by the present application;

FIG. 10 is a schematic diagram of the structure of the electrode system in the embodiment of FIG. 9;

FIG. 11 is a schematic flow chart diagram illustrating another embodiment of a method for detecting an ECG signal;

FIG. 12 is a schematic structural diagram of an embodiment of an apparatus for detecting an electrocardiographic signal provided by the present application;

FIG. 13 is a schematic structural diagram of another embodiment of an apparatus for detecting cardiac electrical signals provided herein;

FIG. 14 is a schematic structural diagram of an embodiment of a computer storage medium provided in the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the conventional electrocardiosignal detection system, when a pregnant woman is subjected to fetal monitoring, more medical instrument test equipment is required in the monitoring process because relevant monitoring parameters such as US, TOCO and the like need to be measured. Therefore, it is necessary and significant to reduce the number of lead wires placed on the body of the pregnant woman as much as possible in the body surface fetal electrocardiogram monitoring process. From the perspective of a user, when the body surface fetal electrocardiogram detection is carried out, the number of the lead wires is required to be as small as possible on the premise of not influencing the basic function so as to reduce the uncomfortable feeling of a pregnant woman.

The traditional electrocardiosignal detection system is mainly used for independently amplifying electrocardiosignals acquired by each pair of lead wires in a multi-lead connection mode. A special lead wire is required to be arranged in a lead system of the traditional technical scheme to serve as a right leg driving lead wire, so that the number of lead wires in the lead system and the complexity of the lead system are increased, and the experience of a user is reduced.

In order to solve the technical problem of the conventional electrocardiograph signal detection system, the present application provides an electrocardiograph signal detection system, and specifically refer to fig. 1, where fig. 1 is a schematic structural diagram of an embodiment of the electrocardiograph signal detection system provided in the present application.

As shown in fig. 1, the electrocardiographic signal detecting system 100 of the present embodiment at least includes a lead set and a detecting circuit; wherein the lead set is coupled to a detection circuit, the detection circuit being operable to control an access state of a plurality of leads in the lead set. The leads are the placement positions of the electrodes on the body surface of the human body and the connection mode of the electrodes and the amplifier.

Wherein, the lead set can include a first lead 111, a second lead 112, and a third lead 113. The first lead 111, the second lead 112, and the third lead 113 may be used for acquiring an electrocardiographic signal, and may also be used as a right leg driving lead, so as to reduce power frequency signal interference in the electrocardiographic signal detection system 100. In particular, the detection circuitry may control the third lead 113 as the right leg drive lead and control the first and second leads 111, 112 to acquire the first cardiac signal; alternatively, detection circuit 12 may also control second lead 112 as the right leg drive lead and first lead 111 and third lead 113 to acquire the second cardiac electrical signal.

In other embodiments, the number of leads of a lead set may be increased or decreased according to the needs of the user. For example, when five leads are set in the lead set, please refer to lead a, lead B, lead C, lead D and lead E in fig. 2. In the electrode system of FIG. 2, the lead sets constitute a total of four acquisition channels, E-B, E-C, E-D and C-A, respectively, each channel processing the cardiac electrical signals using differential amplification. The four acquisition channels may work in time segments, for example, in time segment 1, the detection circuit controls lead a to serve as a right leg driving lead, and controls channels E-B, E-C, and E-D to acquire a first cardiac signal, where lead a is equivalent to the third lead 113; in time period 2, the detection circuit controls lead B to serve as the right leg driving lead, and controls channel C-a to collect the second cardiac signal, and lead D and lead E do not collect the cardiac signals, and at this time, lead B corresponds to the second lead 112.

Further, the detection circuit may also use one of lead B, lead D, and lead E as the right leg driving lead in time period 2, that is, the detection circuit 12 may select any lead other than the channel that needs to acquire the electrocardiographic signal as the right leg driving lead.

Therefore, the electrocardiograph signal detecting system 100 of the present embodiment can automatically select the idle lead to be multiplexed into the right leg driving lead according to the user requirement, and the number of leads and the lead system are simplified on the premise of ensuring the normal operation of the basic function.

Further, the detection circuit of the present embodiment includes a switch circuit 12. The switch circuit 12 switches in the third lead 113 or the second lead 112 by switching the state of the switch, for example, when the switch circuit 12 is in the first state, the switch circuit 12 switches in the third lead 113, so that the third lead 113 serves as the right leg driving lead of the electrocardiographic signal detection system 100; when the switch circuit 12 is in the second state, the switch circuit 12 accesses the second lead 112, so that the second lead 112 serves as the right leg driving lead of the electrocardiographic signal detection system 100.

Further, the electrocardiograph signal detecting system 100 of the present embodiment may further include a controller (not shown in the figure), the controller is coupled to the switch circuit 12, and the controller is configured to control a switch state of the switch circuit. In particular, the controller may receive external control instructions and switch the state of switching circuit 12 in accordance with the external control instructions to cause multiplexing of third lead 113 or second lead 112 as the right leg drive lead. The controller may also extract a preset control code and implement the corresponding control code, executing a control command to toggle the state of switching circuit 12 to cause multiplexing of third lead 113 or second lead 112 as the right leg drive lead.

In order to further disclose the electrocardiographic signal detection system provided by the present application, another electrocardiographic signal detection system is provided in the present application, please refer to fig. 3, and fig. 3 is a schematic structural diagram of another embodiment of the electrocardiographic signal detection system provided by the present application.

On the basis of the electrocardiographic signal detection system 100 of the above embodiment, the detection circuit of the present embodiment further includes a check circuit 13 and a processing circuit 14. Wherein, the inspection circuit 13 is coupled with the lead set and the switch circuit 12 respectively, and the processing circuit 14 is coupled with the lead set.

Wherein, the processing circuit 14 has an electrocardiograph signal processing function, and is used for acquiring a first electrocardiograph signal acquired by the first lead 111 and the second lead 112, and acquiring a second electrocardiograph signal acquired by the first lead 111 and the third lead 113. Further, the processing circuit 14 is further configured to calculate a third cardiac signal according to the first cardiac signal and the second cardiac signal.

Specifically, the first electrocardiographic signal of this embodiment is a maternal-fetal mixed electrocardiographic signal, the second electrocardiographic signal is a maternal electrocardiographic signal, and the third electrocardiographic signal is a fetal electrocardiographic signal. The processing circuit 14 performs hardware filtering amplification and algorithm processing on the maternal electrocardiograph signal and the maternal-fetal mixed electrocardiograph signal to extract a fetal electrocardiograph signal from the maternal-fetal mixed electrocardiograph signal based on the maternal electrocardiograph signal. Specifically, the processing circuit 14 may obtain characteristics of the maternal electrocardiograph signal from the maternal electrocardiograph signal, and further remove corresponding characteristics of the maternal electrocardiograph signal from the maternal and fetal mixed electrocardiograph signal, thereby obtaining the fetal electrocardiograph signal.

The existing electrocardiosignal detection system cannot correctly judge the connection state information of other signal detection leads when a right leg driving lead is not connected. When the power frequency environment is large, the threshold voltage of the right leg drive lead is large, and the right leg drive lead state information is easily detected by mistake, so that accurate information about whether the right leg drive lead is in place cannot be fully provided.

The existing method for detecting the lead in-place function comprises a direct current scheme and an alternating current scheme, and due to the defects of the detection principle, the two lead in-place detection schemes cannot identify the connection state of each signal detection lead under the condition that the right leg driving lead is not connected. Therefore, detection of the disconnection of the right leg drive lead only indicates that all the leads are disconnected, and cannot accurately provide the state information of each signal detection lead when the right leg drive lead is disconnected.

In this regard, the electrocardiographic signal detection system 100 incorporates a test circuit 13, and the test circuit 13 is used to test the state information of each lead. The checking circuit 13 adds a DC bias level on each lead, when the corresponding lead wire is not connected, the level value of the point should be the value of the added DC level; when the corresponding lead wires are connected, the point level value is the direct current level value output by the right leg driving circuit, and whether each lead is connected or not is independently judged by detecting the direct current level range of each lead.

For example, when five leads are set in the lead set, please refer to lead a, lead B, lead C, lead D and lead E in fig. 4. In the electrode system of FIG. 4, the lead set constitutes a total of six acquisition channels, E-B, E-C, E-D, DE, CE, and C-A, respectively, each channel processing the cardiac electrical signals using differential amplification.

In time period 1, the detection circuit controls lead A to be the right leg driving lead and controls channels E-B, E-C and E-D to collect the first electrocardiosignal. At this time, the detection circuit 13 detects the power frequency amplitude of the channel E-B, the channel E-C and the channel E-D; if the power frequency amplitude is greater than the preset threshold, the situation comprises: (1) lead A is not connected, and lead B, lead C, lead D and lead E are partially or completely connected; (2) all leads of the lead set are unconnected.

Further, the detection circuit controls the switching of lead B to the right leg drive lead in time period 2, and the inspection circuit 13 detects whether the channels E-C and E-D have normal waveform outputs. If each channel has no waveform output, judging that all the leads of the lead group are not connected; if at least one of the channels E-C and E-D has the electrocardiosignal waveform output, the lead A is judged to be unconnected, and the connection states of the other leads except the lead A can be judged by the threshold judgment method.

For example, when the test circuit 13 determines that lead B as the right leg drive lead is not connected or all leads are not connected in time period 2, the detection circuit controls lead B to be switched to the signal detection lead in the next time period 1, and the test circuit 13 again detects whether or not the channels E-C and E-D have normal waveform outputs. If each channel has no waveform output, judging that all the leads of the lead group are not connected; if at least one of the channels E-C and E-D has the electrocardio signal waveform output, it is judged that the lead B is not connected.

The existing right leg driving circuit detection method easily causes the output threshold value of the right leg driving operational amplifier to exceed detection under the conditions of good connection and large power frequency environment interference, and the on-site function is easy to detect by mistake. The right leg drive lead and the signal detection lead are switched by the detection circuit 13 in a mode of alternately switching and detecting the time periods 1 and 2, so that the problems can be avoided, the in-place situation of the right leg drive lead can be accurately judged, and the information accuracy of the in-place problem of the lead in the clinical use process is improved.

Further, in order to further disclose a specific structure of the electrocardiograph signal detection system provided by the present application, the present application further provides a specific structure of a detection circuit, specifically please refer to fig. 5, and fig. 5 is a schematic structural diagram of an embodiment of the electrocardiograph signal detection circuit provided by the present application.

The electrocardiograph signal detection circuit 200 includes an amplification circuit 21 and a switch circuit 22, where one end of the switch circuit 22 is coupled to the amplification circuit 21, and the other end is coupled to an external first lead or second lead. In the present embodiment, the amplifying circuit 21 may be a right leg driving circuit.

The switch circuit 22 may be provided with an analog switch, and when the analog switch is in a first state, the switch circuit 22 is connected with the first lead path, so that the first lead is used as a right leg driving lead; when the analog switch is in the second state, the switching circuit 22 is in communication with the second lead such that the second lead functions as the right leg drive lead.

The electrocardiographic signal detection circuit 200 of this embodiment switches different switch states by controlling the analog switch through software, so as to switch the corresponding first lead/second lead to the right leg driving lead, thereby reducing the need for the fixed right leg driving lead in the conventional scheme, and optimizing the lead system scheme. For example, different signal detection leads are collected circularly in time period 1 and time period 2, and the multiplexing of the signal detection leads into the right leg driving leads can be realized by adding an analog switch on a hardware circuit.

Further, the electrocardiographic signal detecting circuit 200 of the present embodiment may be incorporated into an external controller to control the on-off state of the switch circuit 22. In particular, the external controller may receive external control instructions and switch the state of the switching circuit 22 in accordance with the external control instructions to cause the first lead or the second lead to be multiplexed into the right leg drive lead. The external controller may also extract a preset control code and implement the corresponding control code, executing a control command to switch the state of the switching circuit 22 so that the first lead or the second lead is multiplexed into the right leg drive lead.

Further, the switch circuit 22 specifically includes a first switch S1 and a second switch S2. The first switch S1 controls the access state of the first lead and the second switch S2 controls the access state of the second lead.

For example, assuming that a time period is t-t 1+ t2, in the time period t1, the first switch S1 is controlled by software to be turned on, and the second switch S2 is turned off, so that the amplifying circuit 21 outputs a signal connected to the first lead, i.e., the first lead is used as the right leg driving lead in the time period t 1. During time period t2, the first switch S1 is controlled by software to be turned off, and the second switch S2 is turned on, so that the amplifying circuit 21 outputs a signal connected to the second lead, i.e., the second lead is used as the right leg driving lead during time period t 2. Further assuming that the total monitoring time is T, the number of times the switch circuit 22 needs to switch within the monitoring time T is 2 × T/T. The switch states of the first switch S1 and the second switch S2 and the corresponding expressions of the state time of the first lead and the second lead are shown in the following table:

Time	time period t1	Time period t2
			On-off state	S1 ON, S2 OFF	S1 OFF and S2 ON
First lead functional state	Right leg drive lead	Signal detection lead
			Second lead functional State	Signal detection lead	Right leg drive lead

The electrocardiograph signal detection circuit 200 of the present embodiment may further include a check circuit 23, and the check circuit 23 is coupled to the lead set and the amplifying circuit 21, respectively. The checking circuit 23 is used to check the state information of each lead. The checking circuit 23 adds a DC bias level on each lead, when the corresponding lead wire is not connected, the level value of the point should be the value of the added DC level; when the corresponding lead wires are connected, the point level value is the direct current level value output by the right leg driving circuit, and whether each lead is connected or not is independently judged by detecting the direct current level range of each lead.

See, for example, lead A, lead B, lead C, lead D, and lead E in FIG. 6. In the electrode system of FIG. 6, the lead set constitutes a total of six acquisition channels, E-B, E-C, E-D, DE, CE, and C-A, each channel processing the cardiac electrical signals using differential amplification.

In time period 1, amplification circuit 21 controls lead A to be the right leg drive lead and controls channels E-B, E-C, and E-D to acquire the first cardiac signal. At this time, the detection circuit 23 detects the power frequency amplitude of the channel E-B, the channel E-C and the channel E-D; if the power frequency amplitude is greater than the preset threshold, the situation comprises: (1) lead A is not connected, and lead B, lead C, lead D and lead E are partially or completely connected; (2) all leads of the lead set are unconnected.

Further, amplification circuit 21 controls the switching of lead B to the right leg drive lead in time period 2, and test circuit 23 detects whether channels E-C and E-D have normal waveform outputs. If each channel has no waveform output, judging that all the leads of the lead group are not connected; if at least one of the channels E-C and E-D has the electrocardiosignal waveform output, the lead A is judged to be unconnected, and the connection states of the other leads except the lead A can be judged by the threshold judgment method.

For example, when the checking circuit 23 determines that lead B as the right leg drive lead is not connected or all leads are not connected in time period 2, the amplifying circuit 21 controls lead B to be switched to the signal detection lead in the next time period 1, and the checking circuit 23 again detects whether or not the channels E-C and E-D have normal waveform outputs. If each channel has no waveform output, judging that all the leads of the lead group are not connected; if at least one of the channels E-C and E-D has the electrocardio signal waveform output, it is judged that the lead B is not connected.

Further, the present application also provides another specific electrocardiographic signal detection circuit 200, please refer to fig. 7 specifically, and fig. 7 is a schematic structural diagram of another embodiment of the electrocardiographic signal detection circuit provided in the present application.

The amplifying circuit 21 of the above embodiment specifically includes the first amplifier U1 and the second amplifier U2. The physical and electrical connection relationship of the right leg driving multiplexing hardware circuit of fig. 7 is specifically as follows:

the third lead is connected to the input end of the first amplifier U1 through a resistor R1, a resistor R2 and a resistor R5, the fourth lead is connected to the input end of the first amplifier U1 through a resistor R3, a resistor R4 and a resistor R6, and common mode levels of the third lead and the fourth lead are taken and input to the non-inverting input end of the first amplifier U1. The third lead is also grounded through a resistor R1 and a capacitor C1, and the fourth lead is also grounded through a resistor R3 and a capacitor C2. The output of the first amplifier U1 is connected to the inverting input of the second amplifier U2 and to the inverting input of the first amplifier U1.

The resistor R7, the resistor R8, the resistor R9, the capacitor C3 and the second amplifier U2 form an inverse filter amplifying circuit, and the output end of the inverse filter amplifying circuit is connected to the first switch S1 and the second switch S2 after passing through the resistor R10. Specifically, the non-inverting input of the second amplifier U2 is connected to ground, the output of the second amplifier U2 is connected to a resistor R10, and the inverting input of the second amplifier U2.

The electrocardiosignal detection circuit 200 controls the conducting pins of the analog switches through software so as to control the conducting relation of the first switch S1 and the second switch S2. For example, at time period t1, when the first switch S1 is turned on and the second switch S2 is turned off, the resistor R10 is connected to the first lead through the first switch S1, and the first lead is connected to the body surface of the pregnant woman as the right leg driving lead; during the time period t2, the first switch S1 is turned off, the second switch S2 is turned on, and the resistor R10 is connected to the second lead through the second switch S2, wherein the second lead is connected to the body surface of the pregnant woman as the right leg driving lead.

The switch circuit 22 is continuously switched between two states of the first switch S1 being turned on, the second switch S2 being turned off, the first switch S1 being turned off, and the second switch S2 being turned on, so that the first lead and the second lead are continuously switched between the signal detection lead and the right leg driving lead, respectively, thereby realizing the multiplexing of the right leg driving lead.

Further, the present application provides another specific electrocardiograph signal detection circuit 200, please refer to fig. 8 specifically, and fig. 8 is a schematic structural diagram of another embodiment of the electrocardiograph signal detection circuit provided in the present application.

The difference between the physical and electrical connection relationship of the enhanced right leg driving multiplexing hardware circuit in fig. 8 and the physical and electrical connection relationship of the right leg driving multiplexing hardware circuit in fig. 7 is that a third switch S3 and a fourth switch S4 are added at the right leg driving common mode input level input end, the connection manner and components of the remaining hardware circuits are the same as those in fig. 7, and the physical and electrical connection relationship will not be described repeatedly in this embodiment.

The initial state may default to the third switch S3 being on and the fourth switch S4 being off, i.e., the third lead and the fourth lead as the right leg driving the common mode input terminal.

In this mode, the third lead and the fourth lead respectively acquire electrocardiosignals in a time period t1 and a time period t2, and record a signal-to-noise ratio value Z1 in this mode. According to the threshold judgment method, if the signal-to-noise ratio value Z1 is smaller than the preset signal-to-noise ratio threshold value Z, immediately, the third switch S3 is controlled to be turned off by software, and the fourth switch S4 is turned on, that is, the fifth lead and the fourth lead are used as the right leg driving common mode input end.

In this mode, the fifth lead and the fourth lead respectively acquire electrocardiosignals in a time period t1 and a time period t2, and record a signal-to-noise ratio value Z2 in this mode. According to the threshold judgment method, if the signal-to-noise ratio value Z2 is smaller than the preset signal-to-noise ratio threshold value Z, immediately, the sum value is compared, and the larger value between the two is taken, thereby determining the states of the third switch S3 and the fourth switch S4.

For example, when the third switch S3 is turned off by software control, the fourth switch S4 is turned on, i.e., the fifth lead and the fourth lead are used as the right leg to drive the common mode input terminal. At this time, the third switch S3 is controlled by software to be turned on, and the fourth switch S4 is turned off, that is, the third lead and the fourth lead are used as the right leg driving the common mode input terminal.

By the threshold judgment method, the electrocardiosignal detection circuit 200 of the present embodiment can improve the quality of the electrocardiosignal to a certain extent by this method when the signal quality is not good, and improve the success rate of detection to a certain extent by comparing different modes.

In order to solve the above technical problem, the present application further provides an electrocardiograph signal detection method, specifically refer to fig. 9, and fig. 9 is a schematic flowchart of an embodiment of the electrocardiograph signal detection method provided by the present application. The electrocardiograph signal detection method of the present embodiment can be applied to the electrocardiograph signal detection system 100 of the above embodiment, and the specific structure of the electrocardiograph signal detection system 100 is not described herein again.

Specifically, the electrode system of fig. 10 includes three signal detection leads, i.e., a lead a, a lead B, and a lead C, which correspond to a first lead, a second lead, and a third lead in the following steps, respectively. According to the electrocardiosignal detection method, electrocardiosignals of an A-B channel and an A-C channel are acquired in a time-division multiplexing mode; when the electrocardiosignals of the A-B channel are collected, the lead A and the lead B are used as signal detection leads, and the lead C is used as a right leg driving lead; when the electrocardiosignals of the A-C channels are collected, the lead A and the lead C are used as signal detection leads, and the lead B is used as a right leg driving lead.

As shown in fig. 9, the electrocardiographic signal detection method of the present embodiment specifically includes the following steps:

s101: a plurality of first time sequences and a plurality of second time sequences are preset, and the first time sequences and the second time sequences are arranged adjacently.

The detection system presets a plurality of detection periods, each detection period comprises a first time sequence and a second time sequence, and the first time sequence and the second time sequence are arranged adjacently.

S102: the third lead is used as a right leg drive lead at a first timing sequence, and a first cardiac signal is acquired through the first lead and the second lead.

The detection system takes the third lead as a right leg driving lead, takes the first lead and the second lead as signal detection leads, and carries out electrocardio signal acquisition on the first lead and the second lead at a first time sequence and at a preset sampling rate. And entering a second time sequence of S103 after the electrocardiosignal acquisition is finished.

S103: the second lead is driven as the right leg at a second timing and a second cardiac electrical signal is acquired through the first lead and the third lead.

The detection system takes the second lead as a right leg driving lead, takes the first lead and the third lead as signal detection leads, and carries out electrocardiosignal acquisition on the first lead and the third lead at the same preset sampling rate in a second time sequence.

And (5) the detection system repeatedly performs S102 and S103, namely the signal data acquisition of the electrocardiosignals of the body surface fetus is realized.

Further, at the instant when the right leg drives the switching of the leads, the channel formed between the leads is suddenly turned on, and voltage distortion exists. The detection system needs to further extract the acquired electrocardiosignals to eliminate the instability of the electrocardiosignals caused by voltage distortion. Specifically, the detection system may pass the acquired ecg signal through a high-pass filter or an adaptive filter to eliminate signal baseline shift.

S104: and calculating the first electrocardiosignal and the second electrocardiosignal to obtain a third electrocardiosignal.

Because the right leg is required to be switched to drive the leads, the fetal electrocardiosignals on the body surfaces of all the channels are not acquired at the same time, and the fetal electrocardiosignals on the body surfaces of all the channels have certain time difference. Therefore, the detection system needs to perform delay processing on the first cardiac signal acquired by the first timing in one period. For example, if the first lead and the second lead initially acquire the electrocardiographic signals at the first timing, the portion of the electrocardiographic signals needs to be delayed by the duration of the first timing, so as to ensure that the first electrocardiographic signals and the second electrocardiographic signals acquired in one period are synchronized on the time axis.

After time synchronization processing, the detection system performs interpolation between every two delayed first electrocardiosignals and second electrocardiosignals, and the interpolation mode can adopt interpolation methods such as linear interpolation or spline interpolation.

Wherein, the third electrocardiosignal of S104 is the electrocardiosignal of the fetus on the body surface.

S105: separating the third electrocardiosignal to obtain a maternal electrocardiosignal and a fetal electrocardiosignal.

The detection system eliminates baseline drift interference, power frequency interference and electromyographic interference from the body surface fetus electrocardiosignals obtained by the S104 interpolation processing through a preset adaptive filter to obtain clean body surface fetus electrocardiosignals, and then separates the body surface fetus electrocardiosignals by using an adaptive filtering method or a blind source separation method to respectively obtain maternal electrocardiosignals and fetus electrocardiosignals.

Further, the detection system can also obtain the corresponding maternal heart rate and the corresponding fetal heart rate according to the maternal electrocardiosignals and the fetal electrocardiosignals. The specific treatment method comprises the following steps:

the detection system respectively processes the maternal electrocardiosignal and the fetal electrocardiosignal by using a difference filter and a low-pass filter to obtain a maternal QRS peak value and a fetal QRS peak value, then calculates the maternal heart rate according to the position and the interval of the adjacent maternal QRS peak values, and calculates the fetal heart rate according to the position and the interval of the adjacent fetal QRS peak values.

In this embodiment, the electrocardiographic signal detection system presets a plurality of first time sequences and a plurality of second time sequences, and the first time sequences and the second time sequences are adjacently arranged; taking a third lead as a right leg driving lead at a first time sequence, and acquiring a first cardiac signal through the first lead and a second lead; taking a second lead as a right leg driving lead at a second time sequence, and acquiring a second cardiac signal through the first lead and a third lead; calculating the first electrocardiosignal and the second electrocardiosignal to obtain a third electrocardiosignal; separating the third electrocardiosignal to obtain a maternal electrocardiosignal and a fetal electrocardiosignal. The electrocardiosignal detection method reuses the signal detection leads into the right leg driving leads on the premise of not influencing the basic function of the detection system, thereby simplifying the number of leads and the lead system.

For the embodiment shown in fig. 9, the channel formed between the leads conducts suddenly due to the right leg driving the lead switching instant, and there is a voltage distortion. In order to reduce the processing task of the detection system for solving the voltage distortion, the present application further provides another specific electrocardiographic signal detection method, please refer to fig. 11, and fig. 11 is a schematic flow chart of another embodiment of the electrocardiographic signal detection method provided by the present application.

As shown in fig. 11, the electrocardiographic signal detection method of the present embodiment specifically includes the following steps:

s201: the third lead is used as a right leg drive lead in a first sampling period, and a first cardiac signal is acquired through the first lead and the second lead.

In the embodiment shown in fig. 9, if the sampling rate of the signal preset by the detection system is F, the corresponding sampling period is 1/F. In this embodiment, an ADC (Analog-to-Digital Converter) sampling rate is introduced, and the ADC sampling rate is set to be 2N times of a preset signal sampling rate, that is, 2NF, and a corresponding sampling period is reduced to 1/(2NF), where N is an integer greater than 1.

By introducing the sampling rate of the ADC, the first timing is divided into a first sampling period and a first stable period, for example, for each acquisition period 1/F, the first sampling period is 0 to 1/(2NF), and the first stable period is 1/(2NF) to 1/(2F).

The detection system controls the ADC to acquire a first electrocardiosignal through the first lead and the second lead in a time period of 0-1/(2 NF). After the time period of 0-1/(2 NF) is over, the process proceeds to S202:

s202: the second lead is disconnected, the third lead is connected, and the second lead is used as the right leg drive lead in the first stabilization period.

And after the detection system finishes the first sampling period, switching the right leg driving lead from the third lead to the second lead. An acquisition channel formed by the first lead and the third lead is suddenly conducted, voltage distortion exists, certain stabilization time is needed for the voltage of the acquisition channel to change from a saturation state to a sampling signal baseline state, and the time segments of the first stabilization period 1/(2NF) -1/(2F) are the reserved stabilization time for the right leg driving lead switching. During the first stable period, the detection system does not sample the electrocardiosignals until the first stable period is finished, and then enters a second sampling period.

S203: a second cardiac signal is acquired through the first lead and the third lead at a second sampling period adjacent to the first stabilization period.

And when the detection system enters a next second sampling period adjacent to the first stable period, the acquisition channel is already stable. The detection system continues to acquire a second cardiac signal over the first lead and the third lead for a second sampling period.

Further, after the second electrocardiosignal is acquired, the detection system switches the right leg driving lead from the second lead to the third lead again, and similarly, the time segment of (1/(2F) +1/(2NF)) -1/F is the reserved stable time for switching the right leg driving lead.

The electrocardiosignal acquisition task of each channel of the electrocardiosignals of the fetus on the body surface can be completed by repeating the acquisition, the real-time switching of the right leg driving leads is well realized in the acquisition process, and the electrocardiosignals acquired by each channel almost have no time difference.

S204: and calculating the first electrocardiosignal and the second electrocardiosignal to obtain a third electrocardiosignal.

When the detection system needs to introduce a new sampling rate, the time difference between the first electrocardiosignal and the second electrocardiosignal acquired by the detection system is 1/(2F). Therefore, if the first lead and the second lead initially acquire the electrocardiosignals in the first acquisition cycle, the time delay of the electrocardiosignals needs to be 1// (2F), so as to ensure that the first electrocardiosignal and the second electrocardiosignal acquired in one cycle are synchronous on the time axis.

Furthermore, in order to improve the accuracy of acquiring the electrocardiosignals, the detection system can also resample the acquired body surface fetal electrocardiosignals, and because delaying the first electrocardiosignal can only ensure that the first electrocardiosignal and the second electrocardiosignal are synchronous on a time axis, the time difference existing when the first electrocardiosignal and the second electrocardiosignal are sampled cannot be eliminated.

For example, the first electrocardiosignal is an electrocardiosignal acquired within a time period of 0-1/(2 NF), the second electrocardiosignal is an electrocardiosignal acquired within a time period of 1/(2F) - (1/(2F) +1/(2NF)), and a time difference of 1/(2F) exists between the two time periods, namely, the electrocardiosignals of the body surface fetus acquired within the two time periods are not at the same time point. This may result in a difference in amplitude between the first and second electrocardiosignals, and when acquiring the QRS wave signal, the amplitude of the QRS wave changes rapidly, and the QRS wave amplitudes acquired by different channels at different time points may also be different, which may cause troubles in subsequent processing. To eliminate this difference, the first and second cardiac signals need to be re-sampled to ensure that the first and second cardiac signals are sampled at the same point in time. The resampling method is as follows:

the time points of the sampling points of the first electrocardiosignal are 0, 1/F, 2/F and 3/F … …; the time of sampling points of the second electrocardiosignal is 1/(2F), 3/(2F), 5/(2F), 7/(2F) … …; the detection system needs to interpolate every two second electrocardiosignals to obtain the sampling values of the second electrocardiosignals at time points of 1/F, 2/F and 3/F … …, thereby completing resampling processing.

In order to implement the electrocardiograph signal detection method of the above embodiment, the present application provides an electrocardiograph signal detection apparatus, and specifically refer to fig. 12, where fig. 12 is a schematic structural diagram of an embodiment of the electrocardiograph signal detection apparatus provided in the present application.

The electrocardiographic signal detection device 300 of the present embodiment includes an electrocardiographic signal acquisition module 31, an electrocardiographic signal correction module 32, and an electrocardiographic signal calculation module 33.

The electrocardiosignal acquisition module 31 is used for presetting a plurality of first time sequences and a plurality of second time sequences, wherein the first time sequences and the second time sequences are adjacently arranged; taking a third lead as a right leg driving lead at a first time sequence, and acquiring a first cardiac signal through the first lead and a second lead; a second cardiac signal is acquired through the first lead and the third lead at a second timing with the second lead as a right leg drive lead.

The electrocardiosignal correction module 32 is configured to perform calculation processing on the first electrocardiosignal and the second electrocardiosignal to obtain a third electrocardiosignal.

And the electrocardiosignal calculation module 33 is used for separating the third electrocardiosignal to obtain a maternal electrocardiosignal and a fetal electrocardiosignal.

In order to implement the electrocardiograph signal detection method according to the above embodiment, the present application provides another electrocardiograph signal detection device, and specifically refer to fig. 13, where fig. 13 is a schematic structural diagram of another embodiment of the electrocardiograph signal detection device according to the present application.

The cardiac signal detection device 400 of the present embodiment includes a memory 41 and a processor 42, wherein the memory 41 is coupled to the processor 42.

The memory 41 is used for storing program data, and the processor 42 is used for executing the program data to realize the electrocardiosignal detection method of the above-mentioned embodiment.

In the present embodiment, the processor 42 may also be referred to as a CPU (Central Processing Unit). The processor 42 may be an integrated circuit chip having signal processing capabilities. The processor 42 may also be a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components. A general purpose processor may be a microprocessor or the processor 42 may be any conventional processor or the like.

Please refer to fig. 14, fig. 14 is a schematic structural diagram of an embodiment of the computer storage medium provided in the present application, the computer storage medium 500 stores program data 51, and the program data 51 is used to implement the cardiac electrical signal detection method according to the above embodiment when being executed by a processor.

Embodiments of the present application may be implemented in software functional units and may be stored in a computer readable storage medium when sold or used as a stand-alone product. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, a network device, or the like) or a processor (processor) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.

The above description is only for the purpose of illustrating embodiments of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings of the present application or are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.

Claims

1. An electrocardiographic signal detection system characterized by comprising:

2. The cardiac signal detection system of claim 1, wherein the detection circuit comprises a switching circuit comprising at least a first switch and a second switch;

the third lead is connected with the first switch, and the second lead is connected with the second switch;

the first switch is closed, the second switch is open, and the third lead is coupled to the detection circuit as the right leg drive lead;

alternatively, the first switch is open, the second switch is closed, and the second lead is coupled to the detection circuit as the right leg drive lead.

3. The system of claim 2, wherein the detection circuit further comprises an amplification circuit, one end of the amplification circuit is coupled to the switch circuit, and the other end of the amplification circuit is coupled to the conductive set;

the first lead and the second lead are connected with the input end of the amplifying circuit, and the third lead is connected with the output end of the amplifying circuit through the switching circuit;

or, the first lead and the third lead are connected with the input end of the amplifying circuit, and the second lead is connected with the output end of the amplifying circuit through the switch circuit.

4. The cardiac signal detection system of claim 3, wherein the amplification circuit comprises a first amplifier and a second amplifier;

the first lead and the second lead are connected with a non-inverting input end of the first amplifier, an output end of the first amplifier is connected with an inverting input end of the second amplifier, and the inverting input end of the first amplifier is connected;

the non-inverting input end of the second amplifier is grounded, and the output end of the second amplifier is connected with the switching circuit and the inverting input end of the second amplifier.

5. The system for detecting cardiac signals according to claim 4, wherein the set of leads further comprises a fourth lead, the switching circuit further comprising a third switch and a fourth switch;

said first lead being connected to said first amplifier non-inverting input through said third switch, said fourth lead being connected to said first amplifier non-inverting input through said fourth switch, said second lead being connected to said first amplifier non-inverting input;

the third switch is closed, the fourth switch is open, the first lead and the second lead collect a first cardiac signal;

alternatively, the third switch is open, the fourth switch is closed, and the fourth lead and the second lead acquire a first cardiac signal.

6. The cardiac signal detection system of claim 1, wherein the detection circuit further comprises a verification circuit coupled to the lead set;

the detection circuitry controls the third lead as a right leg drive lead, the verification circuitry detects a first frequency amplitude of the first lead and the second lead;

if the first frequency amplitude is larger than the preset frequency amplitude, the detection circuit controls the second lead to be used as the right leg driving lead, and the detection circuit detects the second frequency amplitudes of the first lead and the third lead;

if the second frequency amplitude is larger than 0, the inspection circuit judges that the third lead is not connected; and if the second frequency amplitude is equal to 0, the inspection circuit judges that all the leads in the lead group are not connected.

7. The cardiac signal detection system of claim 1, wherein the detection circuit further comprises a processing circuit coupled to the lead set;

the processing circuit is configured to obtain the first cardiac signal and the second cardiac signal, and calculate a third cardiac signal according to the first cardiac signal and the second cardiac signal.

8. The system for detecting an electrocardiographic signal according to claim 7, wherein the first electrocardiographic signal is a maternal-fetal mixed electrocardiographic signal, the second electrocardiographic signal is a maternal electrocardiographic signal, and the third electrocardiographic signal is a fetal electrocardiographic signal.

9. The system of claim 8, wherein the processing circuit separates the fetal cardiac signal from the maternal fetal mixed cardiac signal based on an adaptive filtering method or a blind source separation method.

10. An electrocardiographic signal acquisition apparatus comprising the electrocardiographic signal detection system according to any one of claims 1 to 9.