CN112741633B - Electrocardiogram signal detection system and electrocardiosignal detection device - Google Patents
Electrocardiogram signal detection system and electrocardiosignal detection device Download PDFInfo
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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Abstract
The application discloses electrocardiosignal detecting system and electrocardiosignal acquisition equipment, this electrocardiosignal detecting system includes: a lead set and a detection circuit, wherein the detection circuit is 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 serve as a right leg driving lead and controls the first lead and the second lead to acquire a first electrocardiosignal; alternatively, the detection circuit controls the second lead as the right leg drive lead and controls the first and third leads to acquire a second electrocardiographic signal. The electrocardiosignal detection system simplifies the lead number and the lead system by multiplexing the right leg driving leads.
Description
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 body surface fetal electrocardiograph field, the number of leads and the placement position of the leads of each body surface fetal electrocardiograph detection product are different according to the product. Therefore, it is necessary to design a lead distribution system that is as compact as possible while meeting product performance requirements.
At present, the electrode distribution system of the body surface fetal electrocardiosignal detection device in the industry generally adopts a mode that a plurality of signal acquisition lead wires are configured to fix right leg driving lead wires, the number of leads of the detection system in the mode is not reduced enough, and it is necessary that the detection system should reduce the burden of pregnant women as much as possible when the body surface fetus is monitored, and the smaller the number of the lead wires, the better the experience of the pregnant women is.
Disclosure of Invention
The application provides an electrocardiosignal detection system and electrocardiosignal acquisition equipment, which are used for solving the problem that the lead number of the detection system in the prior art is not reduced.
For solving the technical problem, a technical scheme that this application adopted is to provide an electrocardiosignal detecting system, electrocardiosignal detecting system includes:
a lead set and a detection circuit, wherein the detection circuit is 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 serve as a right leg driving lead and controls the first lead and the second lead to acquire a first electrocardiosignal;
alternatively, the detection circuit controls the second lead as the right leg drive lead and controls the first and third leads to acquire a second electrocardiographic signal.
In order to solve the technical problem, one technical scheme adopted by the application is to provide electrocardiosignal acquisition equipment, and the electrocardiosignal acquisition equipment comprises the electrocardiosignal detection system.
The beneficial effect of this application is, in contrast to prior art: the electrocardiosignal detection system of the application comprises: a lead set and a detection circuit, wherein the detection circuit is 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 serve as a right leg driving lead and controls the first lead and the second lead to acquire a first electrocardiosignal; alternatively, the detection circuit controls the second lead as the right leg drive lead and controls the first and third leads to acquire a second electrocardiographic signal. The electrocardiosignal detection system simplifies the lead number and the lead system by multiplexing the right leg driving leads.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an embodiment of an electrocardiograph signal detection system provided herein;
FIG. 2 is a schematic view of the structure of the electrode system in the embodiment of FIG. 1;
FIG. 3 is a schematic structural diagram of another embodiment of an electrocardiograph signal detection system provided in the present application;
FIG. 4 is a schematic view of the structure of the electrode system in the embodiment of FIG. 3;
FIG. 5 is a schematic diagram of an embodiment of an electrocardiosignal detection circuit provided in the present application;
FIG. 6 is a schematic view of the structure of the electrode system in the embodiment of FIG. 5;
FIG. 7 is a schematic diagram of another embodiment of an electrocardiosignal detection circuit provided in the present application;
FIG. 8 is a schematic diagram of a structure of a further embodiment of an electrocardiosignal detection circuit provided herein;
FIG. 9 is a flowchart of an embodiment of an electrocardiosignal detection method provided in the present application;
FIG. 10 is a schematic view of the structure of the electrode system in the embodiment of FIG. 9;
FIG. 11 is a flowchart of another embodiment of an electrocardiograph signal detection method provided in the present application;
FIG. 12 is a schematic structural view of an embodiment of an electrocardiograph signal detection device provided in the present application;
FIG. 13 is a schematic view of another embodiment of an electrocardiograph signal detection device 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 following description of the technical solutions in the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
In the current electrocardiosignal detection system, when a pregnant woman is in fetal monitoring detection, more medical instrument testing equipment is needed in the monitoring process because relevant monitoring parameters such as US, TOCO and the like are needed to be measured. Therefore, it is necessary and significant to minimize the number of lead wires placed on the body of a pregnant woman during the body surface fetal electrocardiographic monitoring. From the perspective of a user, when the body surface fetal electrocardiographic detection is carried out, the number of lead wires is required to be as small as possible on the premise of not affecting basic functions so as to reduce uncomfortable feeling of pregnant women.
The traditional electrocardiosignal detection system is mainly used for amplifying electrocardiosignals acquired by each pair of lead wires independently in a mode of connecting multiple leads. A special lead wire needs to be arranged in the lead system of the traditional technical scheme as a right leg driving lead wire, so that the number of the 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 application provides an electrocardiograph signal detection system, and referring to fig. 1 specifically, fig. 1 is a schematic structural diagram of an embodiment of the electrocardiograph signal detection system provided in the application.
As shown in fig. 1, the electrocardiograph signal detection system 100 of the present embodiment includes at least a lead group and a detection circuit; wherein the lead set is coupled to a detection circuit that can be used to control the access status 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 may 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 electrocardiograph signal acquisition, or may be used as a right leg driving lead to reduce power frequency signal interference in the electrocardiograph signal detection system 100. Specifically, the detection circuit may control the third lead 113 as the right leg driving lead and control the first lead 111 and the second lead 112 to collect the first electrocardiographic signal; alternatively, the detection circuit 12 may control the second lead 112 as the right leg driving lead and control the first lead 111 and the third lead 113 to acquire the second electrocardiographic signal.
In other embodiments, the number of leads of the lead set may be increased or decreased depending on the needs of the user. For example, when five leads are provided in the lead set, see in particular leads a, B, C, D, and E in fig. 2. In the electrode system of fig. 2, the lead set forms se:Sub>A total of four acquisition channels, E-B, E-C, E-D and C-se:Sub>A, respectively, each of which processes the electrocardiographic signals using differential amplification. The four acquisition channels may operate in a time period, for example, in the time period 1, the detection circuit controls the lead a to serve as a right leg driving lead, and controls the channels E-B, E-C and E-D to acquire the first electrocardiographic signal, where the lead a corresponds to the third lead 113; in time period 2, the detection circuit controls lead B as the right leg drive lead and controls channel C-se:Sub>A to collect the second cardiac signal, and leads D and E do not collect cardiac signals, at which point lead B corresponds to second lead 112 described above.
Further, the detection circuit may also use one of the leads B, D, and E as the right leg driving lead in the period 2, that is, the detection circuit 12 may select any lead other than the channel in which the electrocardiographic signal needs to be acquired as the right leg driving lead.
Therefore, the electrocardiograph signal detection system 100 of the present embodiment can automatically select idle leads for multiplexing to be right leg driving leads according to the user requirement, and simplify the number of leads and the lead system on the premise of ensuring normal operation of basic functions.
Further, the detection circuit of the present embodiment includes a switch circuit 12. The switch circuit 12 is connected to 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 is connected to 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 switching circuit 12 is in the second state, the switching circuit 12 is connected to the second lead 112 such that the second lead 112 serves as the right leg driving lead of the electrocardiograph signal detection system 100.
Further, the electrocardiograph signal detection 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 the switch state of the switch circuit. Specifically, the controller may receive an external control instruction and switch the state of the switching circuit 12 according to the external control instruction so that the third lead 113 or the second lead 112 is multiplexed as the right leg driving lead. The controller may also extract a preset control code and implement a corresponding control code, and execute a control command to change the state of the switching circuit 12 so that the third lead 113 or the second lead 112 is multiplexed as the right leg driving lead.
In order to further disclose the electrocardiograph signal detection system provided in the present application, another electrocardiograph signal detection system is provided in this embodiment, and with reference to fig. 3, fig. 3 is a schematic structural diagram of another embodiment of the electrocardiograph signal detection system provided in the present application.
On the basis of the electrocardiograph signal detection system 100 of the above-described embodiment, the detection circuit of the present embodiment further includes the inspection circuit 13 and the processing circuit 14. Wherein the checking circuit 13 is coupled to the lead set and the switching circuit 12, respectively, and the processing circuit 14 is coupled to the lead set.
The processing circuit 14 has an electrocardio signal processing function and is used for acquiring first electrocardio signals acquired by the first lead 111 and the second lead 112 and acquiring second electrocardio signals acquired by the first lead 111 and the third lead 113. Further, the processing circuit 14 is further configured to calculate a third electrocardiograph signal according to the first electrocardiograph signal and the second electrocardiograph signal.
Specifically, the first electrocardiograph signal in this embodiment is a maternal-fetal mixed electrocardiograph signal, the second electrocardiograph signal is a maternal electrocardiograph signal, and the third electrocardiograph signal is a fetal electrocardiograph signal. The processing circuit 14 processes the maternal and maternal-fetal mixed electrocardiosignals by hardware filtering amplification and algorithms to extract fetal electrocardiosignals from the maternal-fetal mixed electrocardiosignals based on the maternal electrocardiosignals. Specifically, the processing circuit 14 may obtain maternal electrocardiographic signals from maternal electrocardiographic signals, and further remove corresponding maternal electrocardiographic signals from the maternal fetal mixed electrocardiographic signals, thereby obtaining fetal electrocardiographic signals.
The current electrocardiosignal detection system can not accurately judge the connection state information of the rest signal detection leads when the right leg driving lead wire is not connected. When the power frequency environment is large, the threshold voltage of the right leg driving lead is large, and the state information of the right leg driving lead is easy to be detected by mistake, so that the accurate information of whether the right leg driving lead is in position or not can not be provided fully.
The existing method for detecting the lead in-place function comprises a direct current scheme and an alternating current scheme, wherein 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 due to the defect of the detection principle. Therefore, when the right leg driving lead is not connected, only the unconnected state of all the leads can be prompted, and the state information of each signal detection lead when the right leg driving lead is not connected cannot be accurately provided.
For this purpose, the electrocardiographic signal detection system 100 incorporates a checking circuit 13, and the checking circuit 13 is used to check the state information of each lead. The checking circuit 13 superimposes a dc bias level on each lead, and when the corresponding lead line is not connected, the point level value should be the superimposed dc level value; when the corresponding lead wires are connected, the point level value is a direct current level value output by the right leg driving circuit, and whether the leads are connected or not is independently judged by detecting the direct current level range of the leads.
For example, when five leads are provided in the lead set, see in particular leads a, B, C, D, and E in fig. 4. In the electrode system of fig. 4, the lead sets together form six acquisition channels, E-B, E-C, E-D, DE, CE, and C-se:Sub>A, respectively, each of which processes the electrocardiographic signals using differential amplification.
In time period 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 first electrocardiosignals. At this time, the inspection circuit 13 detects the power frequency amplitudes of the channels E-B, E-C and E-D; if the power frequency amplitude is greater than the preset threshold, the conditions include: (1) Lead A is unconnected, lead B, lead C, lead D, lead E are partially or fully connected; (2) all leads of the lead set are unconnected.
Further, the detection circuit controls the lead B to switch to the right leg driving lead in the period 2, and the check circuit 13 detects whether the channels E-C and E-D have normal waveform output. If the channels do not have waveform output, judging that all leads of the lead group are not connected; if at least one of the channels E-C and E-D has an electrocardiosignal waveform output, the lead A is judged to be not connected, and the connection states of other leads except the lead A can be judged by the threshold judgment method.
For example, when the check circuit 13 judges that the lead B as the right leg driving lead is not connected or that all the leads are not connected in the period 2, the check circuit 13 controls the lead B to switch to the signal detection lead in the next period 1, and the check circuit 13 again detects whether or not the channels E-C and E-D have normal waveform output. If the channels do not have waveform output, judging that all leads of the lead group are not connected; if at least one of the channels E-C and E-D has an electrocardiosignal waveform output, the lead B is judged to be unconnected.
The existing right leg driving circuit detection method is easy to cause the output threshold value of the right leg driving operational amplifier to exceed detection under the conditions of good connection and large interference of power frequency environment, and the in-situ function is easy to be detected by mistake. The corresponding leads are switched between the right leg driving leads and the signal detection leads in a mode of alternately switching detection between the time period 1 and the time period 2 by the detection circuit 13, so that the occurrence of the problems can be avoided, the right leg driving leads can be accurately judged to be in place, and the information accuracy of the lead in place problem 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, and referring specifically to fig. 5, 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 amplifying circuit 21 and a switch circuit 22, wherein one end of the switch circuit 22 is coupled with the amplifying circuit 21, and the other end is coupled with 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, the switch circuit 22 being in communication with the first lead when the analog switch is in the first state such that the first lead acts as the right leg drive lead; when the analog switch is in the second state, the switch circuit 22 is in communication with the second lead such that the second lead acts as the right leg drive lead.
The electrocardiograph signal detection circuit 200 of the embodiment controls the analog switch to switch different switch states through software, so that the corresponding first lead/second lead is switched to the right leg driving lead, the right leg driving lead which needs to be fixed in the traditional scheme is reduced, and the lead system scheme is optimized. For example, the different signal detection leads are circularly collected in the time period 1 and the time period 2, and an analog switch is added on a hardware circuit to realize multiplexing the signal detection leads into a right leg driving lead.
Further, the electrocardiograph signal detection circuit 200 of the present embodiment may incorporate an external controller to control the switching state of the switching circuit 22. Specifically, the external controller may receive an external control instruction and switch the state of the switching circuit 22 according to the external control instruction so that the first lead or the second lead is multiplexed as the right leg driving lead. The external controller may also extract a preset control code and implement a corresponding control code, and execute a control command to change the state of the switching circuit 22 so that the first lead or the second lead is multiplexed as the right leg driving lead.
Further, the switching 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 one time period is t=t1+t2, in the time period t1, the first switch S1 is turned on and the second switch S2 is turned off by software control, and the amplification circuit 21 output is connected to the first lead, that is, the first lead is used as the right leg driving lead in the time period t 1. In the time period t2, the first switch S1 is turned off by software control, and the second switch S2 is turned on, at which time the output of the amplifying circuit 21 is connected to the second lead, i.e., the second lead serves as the right leg driving lead in the time period t 2. Further assuming that the total monitored duration is T, the number of times the switching circuit 22 needs to switch within the monitored duration T is 2*T/T. The corresponding expressions of the switch states of the first switch S1 and the second switch S2 and the state time of the first lead and the second lead are shown in the following table:
| Time | time period t1 | Time period t2 |
| Switch state | S1 is on and S2 is off | S1 is off and S2 is on |
| First lead functional status | Right leg drive lead | Signal detection leads |
| Second lead functional status | Signal detection leads | Right leg drive lead |
The electrocardiograph signal detection circuit 200 of the present embodiment may further include a checking circuit 23, and the checking circuit 23 is respectively coupled to the lead set and the amplifying circuit 21. The checking circuit 23 is used to check the status information of each lead. The checking circuit 23 superimposes a dc bias level on each lead, and when the corresponding lead line is not connected, the point level value should be the superimposed dc level value; when the corresponding lead wires are connected, the point level value is a direct current level value output by the right leg driving circuit, and whether the leads are connected or not is independently judged by detecting the direct current level range of the leads.
For example, see lead A, lead B, lead C, lead D, and lead E in FIG. 6. In the electrode system of fig. 6, the lead sets together form six acquisition channels, E-B, E-C, E-D, DE, CE, and C-se:Sub>A, respectively, each of which processes the electrocardiographic signals using differential amplification.
In time period 1, the amplifying circuit 21 controls the lead A as the right leg driving lead and controls the channels E-B, E-C, E-D to acquire the first electrocardiosignals. At this time, the inspection circuit 23 detects the power frequency amplitudes of the channels E-B, E-C, E-D; if the power frequency amplitude is greater than the preset threshold, the conditions include: (1) Lead A is unconnected, lead B, lead C, lead D, lead E are partially or fully connected; (2) all leads of the lead set are unconnected.
Further, the amplifying circuit 21 controls the lead B to switch to the right leg driving lead in the period 2, and the verifying circuit 23 detects whether the channels E-C and E-D have normal waveform output. If the channels do not have waveform output, judging that all leads of the lead group are not connected; if at least one of the channels E-C and E-D has an electrocardiosignal waveform output, the lead A is judged to be not connected, and the connection states of other leads except the lead A can be judged by the threshold judgment method.
For example, when the check circuit 23 judges that the lead B as the right leg driving lead is not connected or that all the leads are not connected in the period 2, the amplifying circuit 21 controls the lead B to switch to the signal detection lead in the next period 1, and the check circuit 23 detects again whether the channels E-C and E-D have normal waveform output. If the channels do not have waveform output, judging that all leads of the lead group are not connected; if at least one of the channels E-C and E-D has an electrocardiosignal waveform output, the lead B is judged to be unconnected.
Further, another specific electrocardiograph signal detection circuit 200 is provided, referring to fig. 7, and fig. 7 is a schematic structural diagram of another embodiment of the electrocardiograph 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 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 the common mode level of the third lead and the fourth lead is taken and input to the non-inverting input end of the first amplifier U1. The third lead is grounded through a resistor R1 and a capacitor C1, and the fourth lead is grounded through a resistor R3 and a capacitor C2. The output terminal of the first amplifier U1 is connected to the inverting input terminal of the second amplifier U2, and to the inverting input terminal 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 terminal of the second amplifier U2 is grounded, and the output terminal of the second amplifier U2 is connected to the resistor R10 and to the inverting input terminal of the second amplifier U2.
The electrocardiosignal detection circuit 200 controls the conduction pin of the analog switch through software so as to control the conduction relation of the first switch S1 and the second switch S2. For example, in the time period t1, the first switch S1 is turned on, the second switch S2 is turned off, and 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; in 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, and at this time, the second lead is connected to the body surface of the pregnant woman as the right leg driving lead.
The switch circuit 22 is switched on at the first switch S1, the second switch S2 is switched off, and the first switch S1 is switched off, and the second switch S2 is switched on continuously between two states, so that the first lead and the second lead are respectively switched continuously between the signal detection lead and the right leg driving lead, and multiplexing of the right leg driving lead is realized.
Further, another specific electrocardiograph signal detection circuit 200 is provided, referring specifically to fig. 8, 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 electrical connection relationship of the enhanced right leg driving multiplexing hardware circuit of fig. 8 and the physical electrical connection relationship of the right leg driving multiplexing hardware circuit of fig. 7 is that the third switch S3 and the fourth switch S4 are added at the input end of the right leg driving common mode input level, and the connection manner and components of the rest hardware circuits are consistent with those of fig. 7, so that the description of the physical electrical connection relationship is not repeated in this embodiment.
The initial state may default to the third switch S3 being turned on and the fourth switch S4 being turned off, i.e. the third lead and the fourth lead are used as the right leg driving common mode input terminal.
In this mode, the third and fourth leads acquire electrocardiographic signals during time periods t1 and t2, respectively, and record the signal-to-noise value Z1 in this mode. According to the threshold value judging method, if the signal-to-noise ratio value Z1 is smaller than a 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, namely the fifth lead and the fourth lead are used as right leg driving common mode input ends.
In this mode, the fifth and fourth leads acquire electrocardiographic signals during time periods t1 and t2, respectively, and record the signal-to-noise 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 Z, the value of the signal-to-noise ratio is compared with the value of the signal-to-noise ratio value Z, and a larger value between the signal-to-noise ratio value Z2 and the value of the signal-to-noise ratio is taken, so that the states of the third switch S3 and the fourth switch S4 are determined.
For example, at that time, 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 common-mode input terminal of the right leg driving. At the time, the third switch S3 is controlled to be turned on by software, and the fourth switch S4 is turned off, namely the third lead and the fourth lead are used as the right leg driving common mode input end.
By the above-mentioned threshold value judgment method, the electrocardiosignal detection circuit 200 of the embodiment can improve the electrocardiosignal quality to a certain extent by the method when the signal quality is poor, and improve the success rate of detection to a certain extent by comparing different modes.
In order to solve the above technical problems, the present application further provides an electrocardiograph signal detection method, and specifically please refer to fig. 9, fig. 9 is a schematic flow chart of an embodiment of the electrocardiograph signal detection method provided in the present application. The electrocardiograph signal detection method of the present embodiment may be applied to the electrocardiograph signal detection system 100 of the foregoing embodiment, and specific structures of the electrocardiograph signal detection system 100 are not described herein.
As will be understood in conjunction with the electrode system of fig. 10, in particular, the electrode system of fig. 10 includes three signal detection leads, namely, a lead a, a lead B, and a lead C, corresponding to the first lead, the second lead, and the third lead in the following steps, respectively. The electrocardiosignal detection method of the embodiment needs to acquire electrocardiosignals of the A-B channel and the A-C channel in a time-sharing multiplexing mode; when the electrocardiosignals of the A-B channel are acquired, 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 channel are acquired, 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 electrocardiograph signal detection method of the present embodiment specifically includes the following steps:
s101: the first timings and the second timings are set in advance, and the first timings and the second timings are set adjacently.
The detection system presets a plurality of detection periods, and each detection period comprises a first time sequence and a second time sequence, wherein the first time sequence and the second time sequence are adjacently arranged.
S102: the third lead is used as a right leg driving lead at the first time sequence, and the first electrocardiosignal 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 collects electrocardiosignals of the first lead and the second lead at a preset sampling rate at a first time sequence. And after the electrocardiosignal acquisition is finished, the method enters a second time sequence of S103.
S103: and a second lead is used as a right leg driving lead at a second time sequence, and a second electrocardiosignal 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 collects electrocardiosignals of the first lead and the third lead at the same preset sampling rate at a second time sequence.
The detection system repeatedly performs S102 and S103, namely, the signal data acquisition of the body surface fetal electrocardiosignals.
Further, due to the right leg driving lead switching instant, the channel formed between the leads is suddenly turned on, and voltage distortion exists. The detection system needs to further carry out the acquired electrocardiosignals so as to eliminate the instability of the electrocardiosignals caused by voltage distortion. Specifically, the detection system may pass the acquired electrocardiograph 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.
The right leg driving leads are required to be switched, so that the fetal electrocardiosignals on the body surface of each channel are not acquired at the same time, and a certain time difference exists in the fetal electrocardiosignals on the body surface of each channel. Therefore, the detection system needs to perform delay processing on the first electrocardiosignal acquired at the first time sequence in one period. For example, if the first lead and the second lead collect the electrocardiograph signals at the first time sequence, the electrocardiograph signals need to be delayed for the duration of the first time sequence, so that the first electrocardiograph signals and the second electrocardiograph signals collected in one period are synchronous on a time axis.
After time synchronization processing is performed, the detection system performs interpolation between every two of the delayed first electrocardiosignals and the second electrocardiosignals, and interpolation methods such as linear interpolation or spline interpolation can be adopted in the interpolation mode.
The third electrocardiograph signal in S104 is a body surface fetal electrocardiograph signal.
S105: and separating the third electrocardiosignal to obtain a maternal electrocardiosignal and a fetal electrocardiosignal.
The detection system eliminates baseline drift interference, power frequency interference and myoelectric interference on the body surface fetal electrocardiosignals obtained through the interpolation processing of the S104 through a preset self-adaptive filter to obtain clean body surface fetal electrocardiosignals, and then the body surface fetal electrocardiosignals are separated by utilizing a self-adaptive filtering method or a blind source separation method to obtain maternal electrocardiosignals and fetal electrocardiosignals respectively.
Further, the detection system can acquire the corresponding maternal heart rate and fetal heart rate according to the maternal electrocardiosignal and the fetal electrocardiosignal. The specific treatment method comprises the following steps:
the detection system utilizes a differential filter and a low-pass filter to respectively process the maternal electrocardiosignal and the fetal electrocardiosignal to obtain a maternal QRS peak value and a fetal QRS peak value, then calculates the maternal heart rate according to the positions and the intervals of the adjacent maternal QRS peak values, and calculates the fetal heart rate according to the positions and the intervals of the adjacent fetal QRS peak values.
In this embodiment, the electrocardiograph signal detection system presets a plurality of first timings and a plurality of second timings, the first timings and the second timings being adjacently disposed; taking the third lead as a right leg driving lead at a first time sequence, and collecting a first electrocardiosignal through the first lead and the second lead; taking the second lead as a right leg driving lead at a second time sequence, and collecting a second electrocardiosignal through the first lead and a third lead; calculating the first electrocardiosignal and the second electrocardiosignal to obtain a third electrocardiosignal; and separating the third electrocardiosignal to obtain a maternal electrocardiosignal and a fetal electrocardiosignal. The electrocardiosignal detection method multiplexes 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, there is a voltage distortion to the channel formed between the leads due to the right leg drive lead switching instant. In order to reduce the processing task of the detection system for solving the voltage distortion, another specific electrocardiograph signal detection method is further proposed in the present application, and please refer to fig. 11, fig. 11 is a flowchart of another embodiment of the electrocardiograph signal detection method provided in the present application.
As shown in fig. 11, the electrocardiograph signal detection method of the present embodiment specifically includes the following steps:
s201: the third lead is used as a right leg driving lead in the first sampling period, and the first electrocardiosignal is acquired through the first lead and the second lead.
In the embodiment shown in fig. 9, if the preset signal sampling rate of the detection system is F, the corresponding sampling period is 1/F. In this embodiment, an ADC (Analog-to-Digital Converter, digital-to-Analog conversion) sampling rate is introduced, and the ADC sampling rate is set to 2N times the preset signal sampling rate, i.e. 2NF, and the corresponding sampling period is reduced to 1/(2 NF), where N is an integer greater than 1.
By introducing the ADC sampling rate, the first timing is divided into a first sampling period and a first stabilizing period, for example, for each acquisition period 1/F, the first sampling period is 0 to 1/(2 NF), and the first stabilizing period is 1/(2 NF) to 1/(2F).
The detection system controls the ADC to collect the first electrocardiosignal through the first lead and the second lead in the time period of 0-1/(2 NF). After the end of the period of 0 to 1/(2 NF), the process proceeds to S202:
s202: the second lead is disconnected during the first settling period, the third lead is connected, and the second lead is used as the right leg driving lead.
After the detection system finishes the first sampling period, the right leg driving lead is switched from the third lead to the second lead. The acquisition channel formed by the first lead and the third lead is suddenly conducted, voltage distortion exists, a certain stabilization time is needed for the voltage of the acquisition channel to change from a saturated state to a sampling signal baseline state, and a time segment of the first stabilization period 1/(2 NF) to 1/(2F) is reserved stabilization time for switching the right leg driving lead. During the first stable period, the detection system does not sample the electrocardiosignal until the first stable period is finished, and the detection system enters the second sampling period.
S203: a second cardiac signal is acquired through the first lead and the third lead at a next second sampling period adjacent to the first stabilization period.
Wherein the acquisition channel has stabilized when the detection system enters a next second sampling period adjacent to the first stabilization period. The detection system continues to acquire a second electrocardiographic signal over the first and third leads during a second sampling period.
Further, after the second electrocardiosignal is collected, the detection system switches the right leg driving lead from the second lead to the third lead again, and the time segment of (1/(2F) +1/(2 NF)) -1/F is the reserved stable time for switching the right leg driving lead.
The electrocardiosignal acquisition task of each channel of the body surface fetal electrocardiosignal can be completed by repeatedly acquiring in this way, and in the acquisition process, the real-time switching of the right leg driving leads is well realized, and the electrocardiosignals acquired by each channel have almost 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 collect the electrocardiosignals in the first collection period, the delay of 1// (2F) on the part of the electrocardiosignals is needed, so that the first electrocardiosignals and the second electrocardiosignals collected in one period are synchronous on a time axis.
Furthermore, in order to improve the acquisition accuracy of the electrocardiosignals, the detection system can resample the acquired body surface fetal electrocardiosignals, because the time delay of the first electrocardiosignals only ensures that the first electrocardiosignals and the second electrocardiosignals are synchronous on a time axis, but the time difference existing between the first electrocardiosignals and the second electrocardiosignals during sampling cannot be eliminated.
For example, the first electrocardiograph signal is an electrocardiograph signal acquired in a period of 0 to 1/(2 NF), and the second electrocardiograph signal is an electrocardiograph signal acquired in a period of 1/(2F) to (1/(2F) +1/(2 NF)), and there is a time difference of 1/(2F) between the two periods, that is, the body surface fetal electrocardiograph signals acquired in the two periods are not at the same point in time. This can lead to a difference in the amplitude of the first and second electrocardiographic signals, and the amplitude of the QRS wave changes faster when the QRS wave signal is acquired, and the QRS wave amplitudes acquired by different channels at different time points can also be different, which can cause trouble for subsequent processing. To eliminate this difference, it is necessary to resample the first and second electrocardiographic signals, ensuring that the first and second electrocardiographic signals are sampled at the same point in time. The resampling method is as follows:
the time point of the first electrocardiosignal sampling point is 0,1/F,2/F and 3/F … …; the time of the second electrocardiosignal sampling point is 1/(2F), 3/(2F), 5/(2F), 7/(2F) … …; the detection system needs to interpolate the second electrocardiosignals two by two to obtain sampling values of the second electrocardiosignals at time points of 1/F,2/F and 3/F … …, so as to finish resampling processing.
In order to implement the electrocardiograph signal detection method of the foregoing embodiment, an electrocardiograph signal detection device is provided in the present application, and referring specifically to fig. 12, fig. 12 is a schematic structural diagram of an embodiment of an electrocardiograph signal detection device provided in the present application.
The electrocardiograph signal detection device 300 of the present embodiment includes an electrocardiograph signal acquisition module 31, an electrocardiograph signal correction module 32, and an electrocardiograph signal calculation module 33.
The electrocardiograph signal acquisition module 31 is configured to preset a plurality of first time sequences and a plurality of second time sequences, where the first time sequences and the second time sequences are adjacently arranged; taking the third lead as a right leg driving lead at a first time sequence, and collecting a first electrocardiosignal through the first lead and the second lead; and taking the second lead as a right leg driving lead at a second time sequence, and acquiring a second electrocardiosignal through the first lead and the third lead.
The electrocardiograph signal correction module 32 is configured to perform calculation processing on the first electrocardiograph signal and the second electrocardiograph signal to obtain a third electrocardiograph signal.
And an electrocardiosignal calculation module 33, which 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 of the foregoing embodiment, another electrocardiograph signal detection device is proposed in the present application, and referring specifically to fig. 13, fig. 13 is a schematic structural diagram of another embodiment of the electrocardiograph signal detection device provided in the present application.
The electrocardiograph signal detection device 400 of the present embodiment includes a memory 41 and a processor 42, wherein the memory 41 is coupled with the processor 42.
The memory 41 is used for storing program data, and the processor 42 is used for executing the program data to implement the electrocardiographic signal detection method of the above-described 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. 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. The general purpose processor may be a microprocessor or the processor 42 may be any conventional processor or the like.
With continued reference to fig. 14, fig. 14 is a schematic structural diagram of an embodiment of the computer storage medium provided in the present application, in which the program data 51 is stored in the computer storage medium 500, and the program data 51 is used to implement the electrocardiograph signal detection method of the above embodiment when being executed by the processor.
Embodiments of the present application are implemented in the form of software functional units and sold or used as a stand-alone product, which may be stored on a computer readable storage medium. Based on such understanding, the technical solution of the present application may be embodied in essence or a part contributing to the prior art or all or part of the technical solution, in the form of a software product stored in a storage medium, including several instructions to cause a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor (processor) to perform all or part of the steps of the methods described in 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, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The foregoing description is only of embodiments of the present application, and is not intended to limit the scope of the patent application, and all equivalent structures or equivalent processes using the descriptions and the contents of the present application or other related technical fields are included in the scope of the patent application.
Claims (9)
1. An electrocardiograph signal detection system, characterized in that the electrocardiograph signal detection system comprises:
a lead set and a detection circuit, wherein the detection circuit is 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 serve as a right leg driving lead and controls the first lead and the second lead to acquire a first electrocardiosignal;
or the detection circuit controls the second lead to serve as the right leg driving lead and controls the first lead and the third lead to acquire a second electrocardiosignal;
the detection circuit further includes a verification circuit coupled with the set of leads;
the detection circuit controls the third lead as a right leg drive lead, the verification circuit detecting a first frequency magnitude of the first and second leads;
if the first frequency amplitude is larger than a preset frequency amplitude, the detection circuit controls the second lead to serve as the right leg driving lead, and the checking circuit detects the second frequency amplitudes of the first lead and the third lead;
if the second frequency amplitude is greater than 0, the checking circuit judges that the third lead is not connected; if the second frequency amplitude is equal to 0, the verification circuit determines that all of the leads in the lead set are not connected.
2. The 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 with the detection circuit as the right leg driving lead;
alternatively, the first switch is open and the second switch is closed, the second lead being 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 being coupled to the switching circuit and the other end being coupled to the set of leads;
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 switch 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 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 the non-inverting input end of the first amplifier, and the output end of the first amplifier is connected with the inverting input end of the second amplifier and the inverting input end of the first amplifier;
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 of claim 4, wherein the set of leads further comprises a fourth lead, the switching circuit further comprising a third switch and a fourth switch;
the first lead is connected with the non-inverting input end of the first amplifier through the third switch, the fourth lead is connected with the non-inverting input end of the first amplifier through the fourth switch, and the second lead is connected with the non-inverting input end of the first amplifier;
the third switch is closed, the fourth switch is opened, and the first lead and the second lead collect first electrocardiosignals;
alternatively, the third switch is open, the fourth switch is closed, and the fourth lead and the second lead collect the first electrocardiographic signal.
6. The system of claim 1, wherein the detection circuit further comprises a processing circuit coupled to the set of leads;
the processing circuit is used for acquiring the first electrocardiosignal and the second electrocardiosignal and calculating to obtain a third electrocardiosignal according to the first electrocardiosignal and the second electrocardiosignal.
7. The system of claim 6, wherein the first electrocardiograph is a maternal fetal mixed electrocardiograph, the second electrocardiograph is a maternal electrocardiograph, and the third electrocardiograph is a fetal electrocardiograph.
8. The system of claim 7, wherein the processing circuit separates fetal electrocardiographic signals from the maternal fetal mixed electrocardiographic signals based on an adaptive filtering method or a blind source separation method.
9. An electrocardiograph signal acquisition device, characterized in that it comprises the electrocardiograph signal detection system according to any one of claims 1 to 8 。
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