CN110710957A - Non-contact real-time electrocardio monitoring equipment - Google Patents
Non-contact real-time electrocardio monitoring equipment Download PDFInfo
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- A61B5/7232—Signal processing specially adapted for physiological signals or for diagnostic purposes involving compression of the physiological signal, e.g. to extend the signal recording period
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Abstract
The invention discloses non-contact real-time electrocardio monitoring equipment, which comprises a capacitive coupling type non-contact electrocardio electrode, an electrocardiosignal processing module, an analog-to-digital conversion module and a wireless transmission module, wherein a copper-clad sheet is arranged at the bottom layer of the electrocardio electrode, an electrocardiosignal amplifying and filtering processing circuit is arranged at the top layer of the electrocardio electrode, a plug connector is arranged in the center of the top layer of the electrocardio electrode and used for fixing a lead wire, an active shielding layer is arranged between the top layer and the bottom layer of the electrocardio electrode and used for reducing noise and power frequency interference, a circular ring is arranged at the periphery of the top layer of the electrocardio electrode and used for shielding external interference, and the electrocardiosignal acquired by. The non-contact real-time electrocardiosignal monitoring equipment disclosed by the invention has better noise and motion interference resistance and electrocardiosignal quality.
Description
Technical Field
The invention relates to the technical field of medical equipment, in particular to non-contact real-time electrocardio monitoring equipment.
Background
The dynamic electrocardiogram is a clinical common cardiovascular disease screening means, and by recording continuous electrocardiosignals of a suspicious patient for more than 24 hours in a natural living state, arrhythmia events and ST segment abnormal changes which are difficult to find by the conventional electrocardiogram are found, so that an important diagnosis evaluation basis is obtained. The Ag/AgCl electrode is widely used in clinic to be matched with wet conductive gel to be clung to the skin of a human body to obtain a dynamic electrocardiogram, however, the direct contact of the cardiac electrode slice with the skin for a long time can cause adverse reactions such as anaphylactic reaction, skin compression necrosis, infection and the like, patients feel uncomfortable, the sleep quality is influenced, and the compliance is low. Particularly, the patient with severe burns and the population with extremely sensitive skin such as newborn babies are not suitable for long-term electrocardiographic monitoring by the wet electrode.
The non-contact electrocardio monitoring equipment utilizes the electrocardio electrode which is not in direct contact with the skin of a human body to obtain electrocardiosignals in real time, so that the comfort level and the compliance of an electrocardio monitoring user can be improved. The electrode of the capacitive coupling type non-contact electrocardio monitoring system is not in direct contact with the skin of a human body, so that the skin cleaning step and the preparation time are reduced, and the defects of serious attenuation of electrocardiosignals, easy influence of noise and motion interference and poor quality of the electrocardiosignals are mainly overcome. The relative motion between the capacitive coupling type non-contact electrocardio electrode and the skin can generate motion artifacts, and the friction between the electrode and the insulating layer can cause large voltage offset at the input end of the electrode. The influence of noise and motion interference on electrocardiosignals is a key problem which causes that the capacitive coupling type non-contact electrocardio monitoring system is difficult to obtain an electrocardiogram which can be clinically diagnosed at present.
Disclosure of Invention
In view of the above, the present invention provides a non-contact real-time electrocardiograph monitoring device, which is used to solve the problems of serious attenuation of electrocardiograph signals, susceptibility to noise and motion interference, poor quality of electrocardiograph signals, and the like in the prior art related to non-contact electrocardiograph monitoring.
The technical proposal of the invention is to provide non-contact real-time electrocardio monitoring equipment, which comprises an analog front end and an intelligent terminal, the simulation front end comprises a capacitive coupling type non-contact electrocardio electrode, an electrocardiosignal processing module, an analog-to-digital conversion module and a wireless transmission module, the electrocardiosignal processing module comprises an electrocardiosignal amplifying and filtering processing circuit, the bottom layer of the capacitive coupling type non-contact electrocardio electrode is a copper-clad sheet, the electrocardiosignal amplifying and filtering processing circuit is arranged on the top layer of the electrode, a plug connector is arranged in the center of the top layer of the electrode and used for fixing the lead wire, an active shielding layer is arranged between the top layer and the bottom layer of the electrode and used for reducing noise and power frequency interference, a circular ring is arranged on the periphery of the top layer of the electrode to shield external interference, and electrocardiosignals acquired by the non-contact electrocardio real-time monitoring equipment are displayed on the intelligent terminal in real time through wireless transmission.
Optionally, the capacitive coupling type non-contact electrocardio-electrode is an interdigital capacitive coupling type non-contact electrocardio-electrode, each interdigital capacitive coupling type non-contact electrocardio-electrode comprises two channels distributed at intervals, and the channel a1 from the electrode a and the channel b1 from the electrode b form a lead La1b1The a2 channel from electrode a and the b2 channel from electrode b constitute lead La2b2. The electrocardiosignal processing module comprises a band-pass filtering and signal reconstruction module, electrocardiosignals obtained by the capacitive coupling type non-contact electrocardio electrode a and the capacitive coupling type non-contact electrocardio electrode b are respectively reconstructed after being subjected to band-pass filtering, and the capacitive coupling type right leg driving circuit is actively grounded.
Compared with the prior art, the non-contact real-time electrocardio monitoring equipment has the following advantages that: (1) each electrocardio-electrode comprises two channels, the influence of resistance and capacitance change between a human body and the electrode is considered at the same time, the impedance of the electrode is obtained in real time by carrying out band-pass filtering on electrocardio-signals, and an electrocardio-waveform for reducing motion interference is obtained by reconstruction; (2) the active shielding and capacitive coupling right leg driving technology is utilized to obtain good anti-noise interference performance; (3) the capacitive coupling type non-contact real-time electrocardio monitoring equipment provides a new dynamic electrocardio monitoring method for people with severe burns, patients with extremely sensitive skin such as newborns and the like.
As an improvement, the electrocardiosignal V is filtered and amplifieda1b1And Va2b2Respectively passing through M adjacentBand pass filters (M1, 2 … M), if the bandwidth of each band pass filter is small enough, the electrode impedance in each band can be considered as a fixed value, and the center frequency of each band is selected to calculate the input impedance Zin,m. The ecg signal obtained by band pass filtering can be expressed as:
wherein Vs,m(t) is the ECG signal corresponding to the mth frequency band without motion disturbance, Ze,m(t) the electrode impedance for this frequency band. The corresponding electrode impedance Z can be solved by the formulae,m(t)：
Known as La1b1And La2b2Electrocardiographic data Va1b1,m(t) and Va2b2,m(t) reacting Ze,m(t) substituting the electrocardiosignal formula to obtain the electrocardiosignal V of each frequency bands,mAnd (t) adding the electrocardiosignals of each frequency band to obtain the reconstructed electrocardiosignals for reducing the motion interference. The method is used to finally obtain a lead L consisting of the electrodes a and babElectrocardiosignal V ofab(t)。
As an improvement, the non-contact real-time electrocardio monitoring device comprises an electrocardio lossless compression module, electrocardiosignals are subjected to lossless compression and then transmitted to the intelligent terminal in a wireless mode, the intelligent terminal receives the electrocardiosignals and then conducts decompression and signal processing, and the electrocardiosignals are displayed in real time.
As an improvement, the electrocardio lossless compression module performs real-time lossless compression on the electrocardiosignals by using a fuzzy decision particle swarm optimization method for predicting the electrocardio waveforms and a variable length coding method for coding the prediction errors of the electrocardio waveforms.
As an improvement, the electrocardiosignals are transmitted to the intelligent terminal through Bluetooth or a 5G network to be displayed in real time.
As an improvement, the non-contact electrocardio-electrode is embedded into a transfer sickbed, electrocardiosignals are transmitted to an intelligent terminal through a 5G network to be displayed in real time, and the electrocardiosignals of a patient are monitored in real time.
As an improvement, the non-contact electrocardio-electrode is embedded into an automobile seat, and the fatigue driving real-time monitoring is realized through electrocardio-signal processing and analysis.
Drawings
FIG. 1 is a schematic diagram of a non-contact real-time electrocardiographic monitoring device;
FIG. 2 is a schematic diagram of an interdigital capacitive coupling type non-contact electrocardio-electrode structure;
FIG. 3 is a bottom schematic view of an interdigital capacitive coupling type non-contact electrocardio-electrode;
fig. 4 is a flowchart of a band-pass filtering reconstruction method of an electrocardiograph signal.
Detailed Description
The invention will be further described with reference to the following drawings and specific examples, but the invention is not limited to these examples.
The invention is intended to cover alternatives, modifications, equivalents, and alternatives that may be included within the spirit and scope of the invention. In the following description of the preferred embodiments of the present invention, specific details are set forth in order to provide a thorough understanding of the present invention, and it will be apparent to those skilled in the art that the present invention may be practiced without these specific details.
As shown in fig. 1, the non-contact real-time electrocardiograph monitoring device of the present invention includes a simulation front end and an intelligent terminal, wherein the simulation front end includes a capacitive coupling non-contact electrocardiograph electrode, an electrocardiograph signal processing module, an analog-to-digital conversion module, and a wireless transmission module, the electrocardiograph signal processing module includes an electrocardiograph signal amplifying and filtering processing circuit, a copper-clad bottom layer of the capacitive coupling non-contact electrocardiograph electrode is provided with the electrocardiograph signal amplifying and filtering processing circuit on an electrode top layer, a plug connector is provided in the center of the electrode top layer for fixing a lead wire, an active shielding layer is provided between the electrode top layer and the bottom layer for reducing noise and power frequency interference, a ring is provided on the periphery of the electrode top layer for shielding external interference, and the electrocardiograph signal acquired by the non-contact real-time electrocardiograph monitoring device is displayed on the intelligent.
An interdigital capacitive coupling type non-contact electrocardio electrode structure is shown in figure 2, a bottom layer 4 of an electrode is a copper-clad sheet, an electrocardiosignal amplifying and filtering processing circuit is arranged on a top layer 2 of the electrode, a plug connector 1 is arranged in the center of the top layer 2 of the electrode and used for fixing a lead wire, an active shielding layer 3 is arranged between the top layer 2 of the electrode and the bottom layer 4 of the electrode and used for reducing noise and power frequency interference, and a ring is arranged on the periphery of the top layer of the electrode and used for shielding external interference.
According to one embodiment, the capacitive coupling type non-contact electrocardio-electrode is an interdigital capacitive coupling type non-contact electrocardio-electrode, the bottom layer of the electrode is shown in figure 3, each electrode comprises two channels which are distributed at intervals, and the channel a1 from the electrode a and the channel b1 from the electrode b form a lead La1b1The a2 channel from electrode a and the b2 channel from electrode b constitute lead La2b2. The electrocardiosignal processing module comprises a band-pass filtering and signal reconstruction module, electrocardiosignals obtained by the capacitive coupling type non-contact electrocardio electrode a and the capacitive coupling type non-contact electrocardio electrode b are respectively reconstructed after being subjected to band-pass filtering, and the capacitive coupling type right leg driving circuit is actively grounded.
The flow of the band-pass filtering and signal reconstruction method of the electrocardiosignal is shown in FIG. 4, and the electrocardiosignal V after filtering and amplification isa1b1And Va2b2Respectively passing through M adjacent band-pass filters (M is 1,2 … M), if the bandwidth of each band-pass filter is small enough, the electrode impedance in each frequency band can be regarded as a fixed value, and the center frequency of each frequency band is selected to calculate the input impedance Zin,m. The ecg signal obtained by band pass filtering can be expressed as:
wherein Vs,m(t) is the ECG signal corresponding to the mth frequency band without motion disturbance, Ze,m(t) the electrode impedance for this frequency band. The corresponding electrode impedance Z can be solved by the formulae,m(t)：
Known as La1b1And La2b2Electrocardiographic data Va1b1,m(t) and Va2b2,m(t) reacting Ze,m(t) substituting the electrocardiosignal formula to obtain the electrocardiosignal V of each frequency bands,mAnd (t) adding the electrocardiosignals of each frequency band to obtain the reconstructed electrocardiosignals for reducing the motion interference. The method is used to finally obtain a lead L consisting of the electrodes a and babElectrocardiosignal V ofab(t)。
According to one embodiment, the non-contact real-time electrocardiosignal monitoring device comprises an electrocardio lossless compression module, electrocardiosignals are subjected to lossless compression and then transmitted to the intelligent terminal in a wireless mode, the intelligent terminal conducts decompression and signal processing after receiving the electrocardiosignals, and the electrocardiosignals are displayed in real time.
According to one embodiment, the electrocardio lossless compression module performs real-time lossless compression on the electrocardiosignals by using a fuzzy decision particle swarm optimization method for predicting the electrocardio waveforms and a variable length coding method for compressing the electrocardiosignals in a real-time lossless manner for coding prediction errors of the electrocardio waveforms.
According to one embodiment, the electrocardiosignals are transmitted to the intelligent terminal through Bluetooth or a 5G network to be displayed in real time.
According to one embodiment, the non-contact electrocardio-electrode is embedded into a transfer hospital bed, electrocardiosignals are transmitted to an intelligent terminal through a 5G network to be displayed in real time, and the electrocardiosignals of a patient are monitored in real time.
According to one embodiment, the non-contact electrocardio-electrode is embedded into an automobile seat, and real-time monitoring of fatigue driving is achieved through electrocardio-signal processing and analysis.
The foregoing is illustrative of the preferred embodiments of the present invention only and is not to be construed as limiting the claims. The present invention is not limited to the above embodiments, and the specific structure thereof is allowed to vary. In general, all changes which come within the scope of the invention as defined by the independent claims are intended to be embraced therein.
Claims (9)
1. The utility model provides a non-contact electrocardio real-time monitoring equipment, includes simulation front end and intelligent terminal, the simulation front end includes electric capacity coupling formula non-contact electrocardio electrode, electrocardiosignal processing module, analog-to-digital conversion module and wireless transmission module, electrocardiosignal processing module includes electrocardiosignal amplification and filtering processing circuit, the bottom of electric capacity coupling formula non-contact electrocardio electrode is for covering copper sheet, and electrocardiosignal amplification and filtering processing circuit set up at the electrode top layer, sets up plug connector in electrode top layer central authorities and is used for fixed line of leading, sets up the initiative shielding layer between electrode top layer and the bottom for noise and power frequency interference reduction, sets up ring shielding external disturbance in electrode top layer periphery, and the electrocardiosignal that non-contact electrocardio real-time monitoring equipment acquireed shows on intelligent terminal through wireless transmission in real time.
2. The non-contact real-time electrocardiographic monitoring device according to claim 1, wherein: the capacitive coupling type non-contact electrocardio-electrode is an interdigital capacitive coupling type non-contact electrocardio-electrode, each interdigital capacitive coupling type non-contact electrocardio-electrode comprises two channels which are distributed at intervals, and a1 channel from an electrode a and a b1 channel from an electrode b form a lead La1b1The a2 channel from electrode a and the b2 channel from electrode b constitute lead La2b2(ii) a The electrocardiosignal processing module comprises a band-pass filtering and signal reconstruction module, electrocardiosignals obtained by the capacitive coupling type non-contact electrocardio electrode a and the capacitive coupling type non-contact electrocardio electrode b are respectively reconstructed after being subjected to band-pass filtering, and the capacitive coupling type right leg driving circuit is actively grounded.
3. The non-contact real-time electrocardiographic monitoring device according to claim 2, wherein: the band-pass filtering and signal reconstruction are realized by the following methods: electrocardiosignal V after filtering and amplifyinga1b1And Va2b2Selecting a center frequency meter of each frequency band by M adjacent band-pass filters (M is 1,2 … M)Calculating input impedance Zin,m(ii) a The ecg signal obtained by band pass filtering can be expressed as:
wherein Vs,m(t) is the ECG signal corresponding to the mth frequency band without motion disturbance, Ze,m(t) an electrode impedance for this frequency band; the corresponding electrode impedance Z can be solved by the formulae,m(t)：
Known as La1b1And La2b2Electrocardiogram data Va1b1,m(t) and Va2b2,m(t) reacting Ze,m(t) substituting the electrocardiosignal formula obtained by the band-pass filtering frequency band to obtain the electrocardiosignal V of each frequency bands,m(t), the electrocardiosignals of each frequency band are added to obtain the reconstructed electrocardiosignals which can reduce the motion interference; the method is used to finally obtain a lead L consisting of the electrodes a and babElectrocardiosignal V ofab(t)。
4. The non-contact real-time electrocardiographic monitoring device according to claim 3, wherein: the non-contact real-time electrocardio monitoring device comprises an electrocardio lossless compression module, electrocardiosignals are subjected to lossless compression and then transmitted to the intelligent terminal in a wireless mode, the intelligent terminal decompresses and processes the electrocardiosignals after receiving the electrocardiosignals, and the electrocardiosignals are displayed in real time.
5. The non-contact real-time electrocardiographic monitoring device according to claim 4, wherein: the electrocardio lossless compression module performs real-time lossless compression on the electrocardiosignals by using a fuzzy decision particle swarm optimization method for predicting the electrocardio waveforms and a variable length coding method for coding the prediction errors of the electrocardio waveforms.
6. The non-contact real-time electrocardiographic monitoring device according to claim 3, wherein: the electrocardiosignals are transmitted to the intelligent terminal through Bluetooth to be displayed in real time.
7. The non-contact real-time electrocardiographic monitoring device according to claim 3, wherein: the electrocardiosignals are transmitted to the intelligent terminal through a 5G network to be displayed in real time.
8. The non-contact real-time electrocardiographic monitoring device according to claim 5, wherein: the non-contact electrocardio electrode is embedded into a transfer sickbed, electrocardiosignals are transmitted to the intelligent terminal through a 5G network to be displayed in real time, and the electrocardiosignals of a patient are monitored in real time.
9. The non-contact real-time electrocardiographic monitoring device according to claim 5, wherein: the non-contact electrocardio-electrode is embedded into an automobile seat, and the fatigue driving real-time monitoring is realized through electrocardio-signal processing and analysis.
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| CN113662553A (en) * | 2021-08-03 | 2021-11-19 | 复旦大学 | Non-contact cardiopulmonary signal measurement system |
| CN115299892A (en) * | 2022-08-02 | 2022-11-08 | 郑州大学 | Non-contact micro-motion detection system based on edge calculation |
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| CN115299892A (en) * | 2022-08-02 | 2022-11-08 | 郑州大学 | Non-contact micro-motion detection system based on edge calculation |
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