CN110840439A - Electrocardiosignal detection circuit and electrocardiosignal detection device - Google Patents
Electrocardiosignal detection circuit and electrocardiosignal detection device Download PDFInfo
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- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
- A61B5/316—Modalities, i.e. specific diagnostic methods
- A61B5/318—Heart-related electrical modalities, e.g. electrocardiography [ECG]
- A61B5/319—Circuits for simulating ECG signals
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- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
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- A61B5/30—Input circuits therefor
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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- A61B5/7203—Signal processing specially adapted for physiological signals or for diagnostic purposes for noise prevention, reduction or removal
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- A—HUMAN NECESSITIES
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- A61B5/7203—Signal processing specially adapted for physiological signals or for diagnostic purposes for noise prevention, reduction or removal
- A61B5/7217—Signal processing specially adapted for physiological signals or for diagnostic purposes for noise prevention, reduction or removal of noise originating from a therapeutic or surgical apparatus, e.g. from a pacemaker
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- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
- A61B5/7225—Details of analog processing, e.g. isolation amplifier, gain or sensitivity adjustment, filtering, baseline or drift compensation
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Abstract
The invention discloses an electrocardiosignal detection circuit and an electrocardiosignal detection device, wherein the electrocardiosignal detection circuit comprises a receiving amplification circuit, a pacing pulse detection circuit, a pacing pulse suppression circuit and an output amplification circuit; the pace-making pulse detection circuit is electrically connected with the receiving amplification circuit so as to detect whether the electrocardiosignals received by the receiving amplification circuit have pace-making pulse signals; the pace-making pulse detection circuit is electrically connected with the pace-making pulse suppression circuit so as to filter the detected pace-making pulse signal; the output amplifying circuit is electrically connected with the pace-making pulse suppression circuit so as to amplify and output the electrocardiosignals processed by the pace-making pulse suppression circuit. The electrocardiosignal detection circuit provided by the invention obtains the electrocardiosignals by identifying the pacing pulse suppression circuit in the mixed signals and filtering, reduces the influence of the pacing pulse signals on the electrocardiosignals and provides more accurate patient data for medical staff.
Description
Technical Field
The invention relates to the field of medical monitor equipment, in particular to an electrocardiosignal detection circuit and an electrocardiosignal detection device.
Background
The tissue and body fluid around the heart can conduct electricity, so that the human body can be regarded as a volume conductor with three-dimensional space of length, width and thickness. The heart is similar to the power supply, and the sum of the action potential changes of countless myocardial cells can be transmitted and reflected to the body surface. There are potential differences between many points on the body surface, and there are also many points that are isoelectric without potential differences between them. The heart is excited in each cardiac cycle by a pacemaker, an atrium, and a ventricle, and changes in bioelectricity, which are called electrocardiography, are accompanied. The potential differences exist between different points on the surface of a human body, and the electrocardiogram can be drawn by collecting the potential differences. The electrocardiosignal belongs to biomedical signal, is an approximate periodic signal and is characterized by strong mutability. The electrocardiosignal has the characteristics of weakness, low frequency characteristic, high impedance, instability, randomness and the like. The correct extraction of the electrocardiosignal can draw an electrocardiosignal graph, the amplitude of the electrocardiosignal is very small, generally 10 mu V-4 mV, and the typical value is 1 mV.
The pacemaker is an electrical stimulator that produces periodic electrical pulses, which are transmitted to the heart through electrodes. Causing the heart to contract. The heart can recover the normal heart rate. The human body is a volume conductor, pacing signals and electrocardiosignals are collected by an electrocardio measuring circuit together, strong pacing signals influence the characteristics of the electrocardio signals, so that diagnosis is wrong, and the circuit is saturated and the electrocardiosignals are submerged in serious cases.
Disclosure of Invention
The invention mainly aims to provide an electrocardiosignal detection circuit and an electrocardiosignal detection device, which can reduce the influence of pacing pulse signals on the acquisition of electrocardiosignals in the process of treating a patient by using a cardiac pacemaker.
In order to achieve the above object, the present invention provides an electrocardiographic signal detection circuit, which comprises a receiving amplification circuit, a pacing pulse detection circuit, a pacing pulse suppression circuit, and an output amplification circuit; the pace-making pulse detection circuit is electrically connected with the receiving amplification circuit so as to detect whether the electrocardiosignals received by the receiving amplification circuit have pace-making pulse signals; the pace-making pulse detection circuit is electrically connected with the pace-making pulse suppression circuit so as to filter the detected pace-making pulse signal; the output amplifying circuit is electrically connected with the pace-making pulse suppression circuit so as to amplify and output the electrocardiosignals processed by the pace-making pulse suppression circuit.
Furthermore, the electrocardiosignal detection circuit also comprises a high-frequency noise filter circuit, and the high-frequency noise filter circuit is respectively electrically connected with the receiving amplification circuit and the pace-making pulse detection circuit so as to filter high-frequency noise signals.
Further, the pace pulse detection circuit comprises a pace pulse identification unit which is electrically connected with the high-frequency noise filter circuit to identify the pace pulse signal by highlighting the characteristics of the pace pulse signal.
Furthermore, the pace-making pulse recognition unit comprises a first resistor, a second resistor, a first capacitor, a second capacitor and a first amplifier, wherein the first resistor is connected with the second resistor in series, a second end of the second resistor is electrically connected with an anode of the first amplifier, a first end of the first capacitor is connected between the first resistor and the second resistor, a second end of the first capacitor is respectively electrically connected with a cathode and an output end of the first amplifier, a first end of the second capacitor is connected between the second resistor and the first amplifier, and a second end of the second capacitor is grounded.
Furthermore, the pace-making pulse detection circuit also comprises a level adjustment unit, wherein the level adjustment unit comprises a logic level shaping part and a logic electric stabilizing part; the logic level shaping part is electrically connected with the logic level stabilizing part so as to adjust the amplitude of the detected pacing pulse signal to a logic level and carry out signal enhancement and signal stabilization processing on the logic level.
Furthermore, the pace-making pulse detection circuit further comprises a pulse detection switch unit, and the pulse detection switch unit is electrically connected with the pace-making pulse suppression circuit so as to control the detection of the pace-making pulse signal of the electrocardiosignal detection circuit and the start of the suppression function.
Furthermore, the pace-making pulse suppression circuit comprises a first MOS tube, a second MOS tube and a third capacitor, wherein the source electrode of the first MOS tube is electrically connected with the source electrode of the second MOS tube, the drain electrode of the first MOS tube is electrically connected with the high-frequency noise filter circuit, the drain electrode of the second MOS tube is electrically connected with the third capacitor, and a pace-making pulse suppression node is formed between the second MOS tube and the third capacitor so as to filter pace-making pulse signals in the electrocardiosignals.
Furthermore, the electrocardiosignal detection circuit also comprises a low-frequency noise filter circuit, and the low-frequency noise filter circuit is electrically connected with the high-frequency noise filter circuit and the pace-making pulse suppression circuit so as to filter the low-frequency noise of the electrocardiosignal.
Furthermore, the electrocardiosignal detection circuit also comprises a signal conduction acceleration circuit which is electrically connected with the low-noise filter circuit so as to accelerate signal conduction.
The invention also provides an electrocardiosignal detection device which comprises the electrocardiosignal detection circuit.
The electrocardiosignal detection circuit has the advantages that the second-order pace pulse detection circuit highlights the characteristics of pace pulse signals, and the pace pulse signals are adjusted to be positive pulse levels through the level adjustment unit, so that the logic levels of the pace pulse signals are enhanced and stabilized, the pace pulse signals are conveniently filtered subsequently, cleaner electrocardiosignals are obtained, the influence of the pace pulse signals on the electrocardiosignals is reduced, and more accurate data is provided for medical staff.
Drawings
Fig. 1 is a schematic structural diagram of an electrocardiograph signal detection circuit according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a pace pulse detection circuit according to an embodiment of the present invention;
FIG. 3 is a schematic circuit diagram of a pacing pulse identification unit according to an embodiment of the present invention;
FIG. 4 is a schematic circuit diagram of a pacing pulse signal detection differential filter circuit according to an embodiment of the present invention;
FIG. 5 is a circuit diagram of a level adjustment unit according to an embodiment of the present invention;
FIG. 6 is a circuit diagram of a pulse detection switch unit according to an embodiment of the present invention;
FIG. 7 is a circuit schematic of a pace pulse suppression circuit according to an embodiment of the present invention;
FIG. 8 is a circuit diagram of a receiving amplifying circuit according to an embodiment of the present invention;
FIG. 9 is a circuit diagram of a high frequency noise filter circuit according to an embodiment of the present invention;
FIG. 10 is a circuit diagram of a low-frequency noise filter circuit according to an embodiment of the invention;
FIG. 11 is a circuit schematic of a conduction acceleration circuit according to an embodiment of the present invention;
FIG. 12 is a circuit diagram of an output amplifier circuit according to an embodiment of the present invention;
the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. 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 invention.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims of the present application and in the drawings described above, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that the embodiments described herein may be practiced otherwise than as specifically illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It should be noted that the description relating to "first", "second", etc. in the present invention is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The embodiment provided by the invention comprises an electrocardiosignal detection device, wherein the electrocardiosignal detection device comprises an electrocardiosignal detection circuit, the electrocardiosignal detection circuit can be connected with the body of a patient through an electrocardiolead wire of the electrocardiosignal detection device to collect electrocardiosignals of the patient, and when a pacemaker is used for treating the patient, the electrocardiosignal detection circuit can inhibit the interference of pacing pulse signals on the electrocardiosignals and reduce the external interference of diagnosis of a doctor.
Referring to fig. 1-2, the cardiac signal detection circuit includes a receiving amplifier circuit 11, a pace pulse detection circuit 12, a pace pulse suppression circuit 14, and an output amplifier circuit 17; the reception amplification circuit 11; the pace-making pulse detection circuit 12 is electrically connected with the receiving and amplifying circuit 11 to detect whether the electrocardiosignals received by the receiving and amplifying circuit 11 have pace-making pulse signals; the pace pulse detection circuit 12 is electrically connected with the pace pulse suppression circuit 14 to filter the detected pace pulse signal; the output amplifying circuit 17 is electrically connected to the pace pulse suppression circuit 14 to amplify and output the electrocardiographic signal processed by the pace pulse suppression circuit 14.
In the embodiment, the electrocardiosignals mixed with the pacing pulse signals enter the electrocardiosignal detection circuit through an electrocardiolead wire, and the receiving and amplifying circuit 11 amplifies the weak electrocardiosignals and the pacing pulse signals; the pace pulse detection circuit 12 judges whether a pace pulse signal is present, and if the pace pulse signal is present, the pace pulse signal is filtered by the pace pulse suppression circuit 14, and finally the output amplification circuit 17 amplifies and outputs the electrocardiosignal of the filtered pace pulse signal.
Preferably, the electrocardiographic signal detection circuit further includes a high-frequency noise filter circuit 13, and the high-frequency noise filter circuit 13 is electrically connected to the receiving and amplifying circuit 11 and the pace pulse detection circuit 12, respectively, so as to filter a high-frequency noise signal of the electrocardiographic signal.
Specifically, the signals received by the receiving and amplifying circuit 11 are simultaneously sent to the pace-making pulse detection circuit 12 and the high-frequency noise filter circuit 13, and when the received signals enter the pace-making pulse detection circuit 12 and pace-making pulse signals are detected, the received electrocardiosignals are sent to the pace-making pulse suppression circuit 14 to filter the pace-making pulse signals, and the high-frequency noise filter circuit 13 filters the high-frequency noise signals. If the pacing pulse signal does not exist, high-frequency noise filtration is directly carried out, and the high-frequency noise signal in the received electrocardiosignal is removed. Specifically, the electrocardiographic signal and the pacing pulse signal belong to low-frequency-band signals, and the high-frequency-band noise signal is removed by the high-frequency noise filter circuit 13.
Preferably, the electrocardiographic signal detection circuit further includes a low-frequency noise filter circuit 15, and the low-frequency noise filter circuit 15 is electrically connected to the high-frequency noise filter circuit 13 and the pace pulse suppression circuit 14 to filter low-frequency noise of the electrocardiographic signal.
Specifically, the low-frequency noise filter removes low-frequency signals, such as baseline drift, from the electrocardiographic signals from which the high-frequency noise and the pacing pulse signals are removed, so that the electrocardiographic signals are more accurately output.
Preferably, the cardiac signal detection circuit further comprises a signal conduction acceleration circuit 16, and the signal conduction acceleration circuit 16 is electrically connected with the low noise filter circuit to accelerate signal conduction.
Specifically, the signal conduction accelerating circuit 16 effectively increases the signal transmission rate through the charging and discharging of the capacitor itself, so that the electrocardiographic information of the patient can be reflected more quickly.
Referring to fig. 3, the pace pulse detection circuit 12 includes a pace pulse recognition unit 121, and the pace pulse recognition unit 121 is electrically connected to the high frequency noise filter circuit 13 to recognize a pace pulse signal by highlighting the characteristics of the pace pulse signal.
Specifically, the pace pulse identification unit 121 includes a first resistor R1, a second resistor R1, a first capacitor C1, a second capacitor C2 and a first amplifier U1, a second end of the first resistor R1 is electrically connected to the second resistor R2, and a first end of the first resistor R1 is connected to the PaceA end, so as to receive a mixed signal of the electrocardiographic signal and the pace pulse signal output by the receiving and amplifying circuit 11; the second end of the second resistor R2 is electrically connected to the anode of the first amplifier U1, the first end of the first capacitor C1 is connected between the first resistor U1 and the second resistor U2, the second end of the first capacitor C1 is electrically connected to the cathode and the output end of the first amplifier U1, the first end of the second capacitor C2 is connected between the second resistor C2 and the first amplifier U1, and the second end of the second capacitor C2 is grounded. The first resistor R1, the second resistor R2, the first capacitor C1, the second capacitor C2 and the first amplifier U1 form a second-order active filter, a mixed signal of the electrocardiosignals and the pacing pulse signals input by the receiving and amplifying circuit 11 passes through the second-order active filter, and the characteristics of the pacing pulse signals are highlighted so that the pacing pulse signals can be identified. The characteristics of the pacing pulse signal may be referenced to the american society for medical device facilitation as well as graphical shapes. In this embodiment, the first amplifier U1 may be an operational amplifier ADTL082 ARM. In this embodiment, in order to avoid the interference signal being erroneously determined as the pacing pulse signal, the output terminal of the pacing pulse detection circuit 12 is further connected to a pacing pulse signal detection differential filter circuit. Specifically, referring to fig. 4, the pacing pulse signal detection differential filter circuit includes a capacitor C3, a capacitor C4, a resistor R3, a resistor R4, and a second amplifier U2. Specifically, the output end of the pace-making pulse detection circuit 12 is electrically connected to the first end of the capacitor C3, the second end of the capacitor C3 is electrically connected to the resistor R3 to form a differential circuit, the capacitor C4 is connected in parallel to the resistor R4 and is electrically connected to the negative input end and the output end of the second amplifier U2 to form a low-pass filter, the differential circuit is electrically connected to the low-pass filter, and by using the time constant characteristic of the differential circuit, the ORS peak group of the electrocardiographic waveform can be effectively filtered out, and the pace-making pulse signal is retained. The low-pass filter filters noise, and prevents the interference signal from being judged as the pacing pulse signal by mistake. The resistor R5 and the capacitor C5 form a first-order low-pass filter, and the first-order low-pass filter is electrically connected with the positive input end of the second amplifier U2, so that the reference voltage of the positive input end of the second amplifier is reduced in noise, and the normal and stable operation of the operational amplifier is ensured. The second amplifier U2 may be ADTL082 ARM.
Preferably, the pace pulse detection circuit 12 further includes a level adjustment unit 122, and the level adjustment unit 122 includes a logic level shaping portion and a logic level stabilizing portion; the logic level shaping part is electrically connected with the logic level stabilizing part so as to adjust the amplitude of the detected pacing pulse signal to a logic level and carry out signal enhancement and signal stabilization processing on the logic level.
Specifically, referring to fig. 5, the level adjustment unit 122 is configured to adjust the level of the pacing pulse signal, and enhance and stabilize the logic level of the pacing pulse signal. Specifically, the logic level shaping unit includes a resistor R6, a resistor R7, a resistor R8, a resistor R9, a third amplifier U3, and a fourth amplifier U4, specifically, the resistor R6 is electrically connected to a resistor R7, the resistor R7 is electrically connected to a resistor R8, the resistor R8 is electrically connected to a resistor R9, a negative terminal of the third amplifier U3 is connected between the resistor R6 and the resistor R7, a positive terminal of the fourth amplifier U4 is connected between the resistor R8 and the resistor R9, a node at which a positive terminal of the third amplifier U3 is electrically connected to a negative terminal of the fourth amplifier U4 is electrically connected to the pace pulse recognition unit 121, a window comparator is formed by two amplifiers to process the pace pulse signal output by the pace pulse recognition unit 121, and to unify the amplitude of the pace pulse signal to a logic level. The logic level stabilizing part comprises a semiconductor diode D1 and a resistor R10, wherein two input pins of the semiconductor diode D1 are respectively and electrically connected with the output end of the third amplifier U3 and the output end of the fourth amplifier U4, the output end of the semiconductor diode D1 is electrically connected with a resistor R10, and the other end of the resistor R10 is electrically connected with the ground. The logic level of the pacing pulse signal is set to be a positive pulse signal by the semiconductor diode D1, and the circuit is stabilized by the resistor R10. The logic power stabilizer further includes a first nand gate U1 and a second nand gate U2, the first nand gate U1 and the second nand gate U2 being electrically connected to enhance stabilization of the logic level of the pacing pulse signal processed as the positive pulse signal.
Preferably, the pace pulse detection circuit 12 further includes a pulse detection switch unit 123, and the pulse detection switch unit 123 is electrically connected to the pace pulse suppression circuit 14 to control the detection of the pace pulse signal of the cardiac signal detection circuit and the activation of the suppression function.
Specifically, referring to fig. 6, the pulse detection switch unit 123 includes a field-effect transistor Q3, the PaceCon terminal of the field-effect transistor Q1 is electrically connected to the central control unit of the electrocardiographic signal detection device, and only when a patient wearing a pacemaker detects an electrocardiograph, the pulse detection switch unit 123 is turned on to control the amplified electrocardiographic signal of the reception amplification circuit 11 to be transmitted to the pacing pulse detection circuit 12.
Preferably, referring to fig. 7, the pace pulse suppression circuit 14 includes a first MOS transistor Q1, a second MOS transistor Q2 and a third capacitor C6, a source of the first MOS transistor Q1 is electrically connected to a source of the second MOS transistor Q2, and a drain of the first MOS transistor Q1 is electrically connected to the high-frequency noise filter circuit 13; the drain of the second MOS transistor Q2 is electrically connected to the third capacitor C6, and a pacing pulse suppression node is formed between the second MOS transistor Q2 and the third capacitor C3 to filter out a pacing pulse signal in the cardiac electrical signal.
Specifically, the drain of the first MOS transistor is electrically connected to the high-frequency noise filter circuit 13 to obtain a mixed signal, the first MOS transistor Q1 is electrically connected to the gate of the second MOS transistor Q2, and is electrically connected to the pace pulse detection circuit 12 to obtain a detection result of the presence of a pace pulse signal, when the pace pulse detection circuit 12 detects the presence of a pace pulse signal, the first MOS transistor Q1 and the second MOS transistor Q2 are turned on, and the pace pulse signal is pulled down by the pace pulse suppression node until the pace pulse signal is filtered out, so that the effect of suppressing the pace pulse signal is achieved.
Preferably, referring to fig. 8, the receiving and amplifying circuit 11 includes a differential amplifier U3, IN-and IN + of the differential amplifier U3 are connected to the left leg and the right arm of the human body through an electrocardiograph cable, so as to receive the electrocardiograph signal of the user. The specific connecting parts can be connected according to specific conditions, and are not limited herein. Resistor R11 connects RG-and RG + of differential amplifier U3 to adjust the amplification of differential amplifier U3. VSS of the differential amplifier U3 is electrically connected with the capacitor C7, VDD of the differential amplifier U3 is electrically connected with the capacitor C8, and the capacitor C9 and a Ref interface of the differential amplifier U3 are simultaneously connected with 1.65V voltage to be used as a reference voltage of the differential amplifier. Specifically, the capacitor C7, the capacitor C8 and the capacitor C9 are all filter capacitors of the power supply. The signal at PaceA is transmitted to the pace pulse detection circuit 12 for signal detection.
Preferably, referring to fig. 9, the high frequency noise filter circuit 13 includes a resistor R12, a resistor R13, a capacitor C10 and a capacitor C11, the resistor R12 is connected in series with the resistor R13, the capacitor C10 and the capacitor C11 are respectively electrically connected to two ends of the resistor R13, the capacitor C11 is connected between the resistor R12 and the resistor R13, and meanwhile, the other ends of the capacitor C10 and the capacitor C11 are grounded. And the resistor R13 and the capacitor C11 are electrically connected with the pace pulse suppression circuit 14, and pulses are suppressed by the pace pulse suppression circuit 14. The circuit consists of two groups of resistor capacitors, wherein R12 and C10 form a first-order low-pass filter, and a group of resistor capacitors R13 and C11 are added to form a second-order low-pass filter. The low-pass filter is used for blocking high-frequency and low-frequency, namely high-frequency noise is filtered and adjusted, low-frequency signals can pass through, the electrocardiosignals and the pacing pulses belong to the low-frequency signals, and the low-pass filter can filter the high-frequency noise in the electrocardiosignals.
Preferably, referring to fig. 10, the low-frequency noise filter circuit 15 includes a capacitor C12, a resistor R14 and a resistor R15 to form a high-pass filter, and the high-pass filter is used to block low-frequency and high-frequency signals, i.e., low-frequency signals, such as baseline wander, etc., from being filtered by the high-pass filter, and high-frequency signals can pass through. Thus, the high-frequency noise filter circuit 13 and the low-frequency noise filter circuit 15 constitute a band-pass filter which allows only frequency signals within a predetermined range to pass therethrough, and filters frequencies exceeding the predetermined range, and the band-pass filter is also designed to effectively extract the electrocardiographic signals and the pacing pulse signals to pass therethrough.
Preferably, referring to fig. 11, the conduction acceleration circuit 16 includes a resistor R16, a resistor R17, and a control chip U6, specifically, a control chip MC14053BDTR 2. The conduction acceleration circuit 16 is electrically connected to the low-frequency noise filter circuit 15 to control the capacitor in the low-frequency noise filter circuit 15 to charge and accelerate so as to increase the signal conduction speed.
Preferably, referring to fig. 12, the output amplifying circuit 17 includes a fifth amplifier U5, a resistor R18, a resistor R19, a resistor R20, and a capacitor C13. The fifth amplifier U5 adopts an operational amplifier ISL28213FUZ, the reference voltage of the operational amplifier is 1.65V, and the operational amplifier, the resistor R18, the resistor R19, the resistor R20 and the capacitor C13 form active filtering, so that the fifth amplifier U5 not only has an amplification effect, but also has an effect of filtering noise.
The electrocardiosignal detection circuit provided by the embodiment highlights the characteristic of the pacing pulse signal through the second-order pacing pulse detection circuit 12, and adjusts the pacing pulse signal to be a positive pulse level through the level adjustment unit, so that the logic level of the pacing pulse signal is enhanced and stabilized, the subsequent filtering of the pacing pulse signal is facilitated, a cleaner electrocardiosignal is obtained, the influence of the pacing pulse signal on the electrocardiosignal is reduced, and more accurate data is provided for medical staff.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. The electrocardiosignal detection circuit is characterized by comprising a receiving amplification circuit, a pace-making pulse detection circuit, a pace-making pulse suppression circuit and an output amplification circuit; the pace-making pulse detection circuit is electrically connected with the receiving amplification circuit so as to detect whether the electrocardiosignals received by the receiving amplification circuit have pace-making pulse signals; the pace-making pulse detection circuit is electrically connected with the pace-making pulse suppression circuit so as to filter the detected pace-making pulse signal; the output amplifying circuit is electrically connected with the pace-making pulse suppression circuit so as to amplify and output the electrocardiosignals processed by the pace-making pulse suppression circuit.
2. The electrical cardiac signal detection circuit as set forth in claim 1, further comprising a high frequency noise filter circuit electrically connected to the receive amplifier circuit and the pace pulse detection circuit, respectively, for filtering high frequency noise signals.
3. The cardiac signal detection circuit according to claim 1 or 2, wherein the pace pulse detection circuit comprises a pace pulse recognition unit electrically connected to the high frequency noise filter circuit to highlight amplitude characteristics of the pace pulse signal and recognize the pace pulse signal.
4. The electrical cardiac signal detection circuit according to claim 3, wherein the pace-making pulse identification unit includes a first resistor, a second resistor, a first capacitor, a second capacitor and a first amplifier, the first resistor is connected in series with the second resistor, a second end of the second resistor is electrically connected to a positive electrode of the first amplifier, a first end of the first capacitor is connected between the first resistor and the second resistor, a second end of the first capacitor is electrically connected to a negative electrode and an output end of the first amplifier, respectively, a first end of the second capacitor is connected between the second resistor and the first amplifier, and a second end of the second capacitor is grounded.
5. The electrical cardiac signal detection circuit according to claim 3, wherein the pace pulse detection circuit further comprises a level adjustment unit, the level adjustment unit comprising a logic level shaping portion and a logic level stabilizing portion; the logic level shaping part is electrically connected with the logic level stabilizing part so as to adjust the amplitude of the detected pacing pulse signal to a logic level and carry out signal enhancement and signal stabilization processing on the logic level.
6. The electrical cardiac signal detection circuit according to claim 3, further comprising a pulse detection switch unit electrically connected to the pace pulse suppression circuit to control the start of the detection and suppression functions of the pace pulse signal of the electrical cardiac signal detection circuit.
7. The electrocardiosignal detection circuit according to claim 2, wherein the pace pulse suppression circuit comprises a first MOS transistor, a second MOS transistor and a third capacitor, a source of the first MOS transistor is electrically connected to a source of the second MOS transistor, a drain of the first MOS transistor is electrically connected to the high-frequency noise filter circuit, a drain of the second MOS transistor is electrically connected to the third capacitor, and a pace pulse suppression node is formed between the second MOS transistor and the third capacitor to filter the pace pulse signal in the electrocardiosignal.
8. The electrical cardiac signal detection circuit of claim 2, further comprising a low frequency noise filter circuit electrically connected to the high frequency noise filter circuit and the pace pulse suppression circuit to filter low frequency noise of the electrical cardiac signal.
9. The electrical cardiac signal detection circuit as recited in claim 3 further comprising a signal conduction acceleration circuit electrically connected to the low noise filtering circuit to accelerate signal conduction.
10. An electrocardiographic signal detection device characterized by comprising the electrocardiographic signal detection circuit according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN114094967A (en) * | 2021-11-26 | 2022-02-25 | 江苏科技大学 | Self-adaptive threshold generator for action potential detection |
| CN114094967B (en) * | 2021-11-26 | 2023-08-22 | 江苏科技大学 | Self-adaptive threshold generator for action potential detection |
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