CN115192032A - Flexible bioelectricity dry electrode detection method and device - Google Patents

Abstract

The invention discloses a method and a device for detecting electrocardiogram of a screen-printed dry electrode with a layered structure. The purpose is to provide an electrocardiographic information acquisition device with simple structure, small volume, convenient operation and low price, which can collect electrocardiographic signals, breathing signals and ultrasonic signals conveniently and non-invasively. The ECG patch is composed of two parts: a. the base of the ECG collector and b. the flexible dry electrode. a. The base of the ECG collector is used to communicate with the ECG collector, and transmit the collected ECG signals to the ECG collector. The flexible dry electrode is composed of c. fabric base layer, d. TPU elastic film layer, e. stretchable sealing layer, f. conductive ink layer (printed circuit) and g. sensing area, the flexible dry electrode is made by screen printing technology It has good flexibility and customizability, and supports multiple cleaning and reuse. Unlike traditional wet electrodes, it does not need to use conductive glue, which can avoid the effect of conductive glue drying on bioelectric signal acquisition. It is suitable for embedding long-term monitoring in wearable devices.

Description

A flexible biological electric dry electrode detection method and device

technical field

The invention belongs to the technical field of medical signal detection and processing, and in particular relates to a flexible biological electric dry electrode detection method and device.

Background technique

Various electrodes are widely used clinically to collect bioelectrical signals, which are used to measure and evaluate the state of the human body. The central electrical signal is one of the important bioelectrical signals of the human body. Experienced doctors can evaluate the patient's heart and physical status and observe the patient's condition. In current medical applications, Ag/AgCl wet electrodes are generally used for the acquisition of human bioelectrical signals, and conductive glue is used to reduce noise interference during acquisition, ensure close contact between electrodes and human skin, and reduce contact impedance. The Ag/AgCl wet electrode has some defects, such as the conductive glue is easy to dry and solidify, which will reduce the collection effect; the body hair needs to be scraped off and wiped with alcohol, which brings inconvenience to patients and doctors. Compared with Ag/AgCl wet electrodes, the method and device for ECG detection of layered structure screen-printed dry electrodes can avoid the above problems, and can realize continuous and long-term ECG monitoring without affecting the daily life of patients. , with the characteristics of convenience and speed.

The disadvantage of the existing dry electrodes is that due to the absence of conductive glue, the contact between the electrodes and the human skin is not good, which will greatly interfere with the acquisition quality of the ECG signal when the human body is exercising, and the quality of the signal is related to the doctor and the computer. assessment of physical condition. This is because the general dry electrodes use contact electrodes, and the conductive parts of some dry electrodes are made of metal materials, which do not have good flexibility, and the contact surface with the human skin will shift due to movement. , reduce the signal quality, and even cause harm to the human body. Other dry electrodes add foam material between the conductive part and the substrate. Although this method can enhance flexibility and make the electrode in close contact with the skin, it increases the width of the electrode and does not meet the properties of long-term wear.

The present invention proposes a layered structure screen printing dry electrode electrocardiographic detection method and device. The flexible dry electrode used adopts a layered structure and is realized by screen printing technology, which has excellent flexibility and comfort, even in In the state of human motion, the electrode can still be in good contact with the human skin, and the quality of ECG signal acquisition can be ensured.

At the same time, with the development of the economy, people's lifestyles have undergone great changes. Busy work has greatly shortened people's exercise time, fast food intake, and cardiovascular disease has gradually developed to young people in their 30s. Therefore, the ECG signal can be continuously monitored in real time for a long time, which can accurately reflect the physical condition and make timely adjustments to prevent the occurrence of dangerous situations.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide an ECG monitoring device that is easy to wear, easy to operate, and can remotely monitor the ECG information of patients for a long time. Its core combines screen printing technology, flexible dry electrode technology, electrode configuration technology, and biological fuel cell technology technology, a layered structure screen-printed dry electrode electrocardiographic detection method and device that can overcome the shortcomings of the prior art.

The content and main technical features of the present invention are as follows:

(1) A flexible biological electric dry electrode detection method and device disclosed in the present invention, the device includes:

A flexible dry electrode with a layered structure, a bioelectric collector and its base, a self-powered module, and a vital sign detection module are used; wherein, the flexible dry electrode with a layered structure includes a common fabric base layer, polydimethylsiloxane (PDMS) Elastic film layers, stretchable sealing layers, bioelectrically sensitive layers of carbon-silver mixtures (printed circuits).

The bioelectric detection method is that a bioelectric collector base is placed on a common fabric base layer, the bioelectric collector base is communicated with the bioelectric collector, and the connecting copper wire and the interface circuit are embedded in the carbon-silver mixture (printed circuit) In the bioelectric sensitive layer of the device, the bioelectric signal acquisition is realized under the drive of the self-powered module and the collected bioelectric signal is transmitted to the bioelectric collector.

The flexible dry electrode of the layered structure is realized by means of computer-aided design technology, and the flexible dry electrode is layered and printed on the position where the fabric base layer is in contact with the human body by using the screen printing technology. Bioelectrical dry electrodes and wearable detection devices have the characteristics of low cost, easy mass production and comfortable wearing, and are also convenient for single-lead, standard three-lead, standard three-five-lead, standard twelve-lead ECG and high-density ECG. The application expansion of the electric vest device can also realize the bioelectric detection device of multi-lead EEG cap and EMG sleeve.

(2) A flexible bioelectric dry electrode detection method and device disclosed in the present invention is characterized in that: the bioelectric sensitive layer material of the flexible dry electrode adopts a certain proportion of carbon-silver mixture or conductive pure Silver paste, whose thickness is controlled in a thin layer below 1 mm, to maintain a better contact interface with the contacting skin.

(3) A flexible biological electric dry electrode detection method and device disclosed in the present invention is characterized in that: the flexible dry electrode with a layered structure is composed of a fabric base layer, a PDMS elastic film layer, Carbon-silver mixture (printed circuit) and flexible sensing layer. The outer layer refers to the direction away from the human skin, and the inner layer refers to the direction close to the human skin. The flexible dry electrode and the base of the ECG collector are connected by a copper wire and an interface circuit, which is realized by contact.

(4) A flexible bioelectric dry electrode detection method and device disclosed in the present invention are characterized in that: the bioelectric collector adopts three flexible dry electrodes to form a single-lead ECG detection with high signal-to-noise ratio Two of the devices are designed as ECG acquisition electrodes for recording single-lead ECG signals, and the other is designed as a reference electrode for reducing power frequency noise.

(5) A flexible biological electric dry electrode detection method and device disclosed in the present invention is characterized in that: the self-power supply module adopts lithium ion battery and sweat biological battery, wherein the sweat biological battery is used as a self-producing device , using microbial tissue as a catalyst, and lactic acid produced by human sweat as a substrate to supply power to the biological battery, thereby extending the monitoring time of the wearable ECG detection device.

(6) A flexible biological electric dry electrode detection method and device disclosed in the present invention is characterized in that: the vital sign detection module includes a heart sound acquisition module and a chest impedance detection module. The thoracic impedance detection module can observe the breathing state of the human body in real time by detecting the change of the thoracic impedance of the human body when breathing, and at the same time, the wearable device can be detected by the thoracic impedance detection module. The heart sound acquisition module collects the first heart sound and the second heart sound, and analyzes the systole and diastole of the ventricle in combination with each stage of the electrocardiogram, which can better study the changes of the heart in a cardiac cycle.

(7) A flexible biological electric dry electrode detection method and device disclosed in the present invention is characterized in that: the vital sign detection module amplifies and filters the signal and then transmits it to the microprocessor module through A/D conversion, and the micro- The processor module compresses and packs the data and sends it to the terminal, and the terminal displays the data in real time and performs preliminary analysis and calculation. Among them, there are two data transmission methods: the first is Bluetooth transmission: the packaged ECG signal is connected to the mobile phone through the wireless transmission module, and the mobile phone can receive the data and see the real-time transmitted ECG signal. ; The second is USB transmission. After collecting the ECG signal, remove the ECG collector and connect it to the computer through USB. The computer can perform more complex analysis and processing on the ECG signal.

Description of drawings

1 is a schematic structural diagram of a screen-printed dry electrode of a flexible biological electric dry electrode detection method and device of the present invention.

FIG. 2 is a schematic structural diagram of an embodiment of an ECG patch of a flexible bioelectrical dry electrode detection method and device according to the present invention.

3 is a schematic structural diagram of an embodiment of an ECG chest strap of a flexible bioelectrical dry electrode detection method and device of the present invention

FIG. 4 is a flow chart of an ECG monitoring system of a flexible bioelectrical dry electrode detection method and device according to the present invention.

FIG. 5 is a diagram of the implementation of signal monitoring of a flexible biological electric dry electrode detection method and device of the present invention.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the specific embodiments and the accompanying drawings. It should be understood that these descriptions are exemplary only, and are not intended to limit the scope of the invention.

Referring to Figure 1, the specific structure of the flexible bioelectric dry electrode is shown. We regard the e. stretchable sealing layer as the inner side, which is attached to the skin; the a. ECG collector base is regarded as the outer side, which is connected with the ECG collector. connect.

Referring to Figure 2, it is an example of an ECG patch for a flexible bioelectrical dry electrode detection method and device. When monitoring the patient's ECG signal, the ECG patch needs to be attached to the patient's chest as shown in Figure 2, and connected to the ECG acquisition. The device can monitor the patient's ECG signal in real time.

Referring to Figure 3, a flexible bioelectric dry electrode detection method and device, the ECG chest strap includes three flexible bioelectric dry electrodes with a layered structure, of which 1 is the flexible bioelectric dry electrode, which can monitor wear in real time. ECG signal, heart sound signal and thoracic impedance change signal of the user, 2 is the reference electrode for reducing power frequency interference, 3 is the base of the ECG collector for connecting with the ECG collector.

In actual use, the ECG monitoring device can be directly worn under the human chest, as shown in Figure 3, this position is the I lead position, and the ECG collector is inserted into the base of the ECG collector, which can be clearer without wires. Accurately collect human ECG signals, and understand the health of the heart anytime, anywhere.

FIG. 4 shows a flow chart of an ECG detection system of a flexible bioelectrical dry electrode detection method and device. The structure of the central electricity collector includes an ECG acquisition module, a heart sound acquisition module, a microprocessor module, a power management module, a wireless transmission module and a wired transmission module. Wear the ECG chest strap as shown in Figure 2 under the patient's chest, connect the ECG collector to the ECG collector base of the ECG monitoring device, and the ECG monitoring device starts to work.

The thoracic impedance detection circuit in the present invention can detect the change of the thoracic impedance when the human body is breathing in real time, and can observe the breathing state of the human body when it is moving. At the same time, it can also be used as an anti-dropping monitoring. The wearer will be reminded to adjust the position of the ECG monitoring device.

Figure 5 is the real-time ECG signal and the change signal of the chest impedance of the wearer.

The collected ECG information is transmitted to the microprocessor module, and there are two ways to transmit it to the terminal: the first is wireless transmission. The present invention uses Bluetooth transmission, and the microprocessor module compresses the collected ECG signals. Packed, sent to the mobile phone through the wireless transmission module, and uploaded to the cloud server at the same time; the second is wired transmission, the microprocessor module compresses and packs the collected ECG signals, heart sound signals and ultrasound signals, and connects to the computer through the USB interface , Decompress the compressed package on the computer to obtain the ECG information of the patient in the monitoring time period, and filter out the noise through digital filtering, and then further analyze the ECG signal for clinical diagnosis and analysis.

The flexible bioelectrical dry electrode detection method and device of the present invention have the advantages of small size, long battery life, comfortable wearing, and can continuously monitor the electrocardiographic health status of the human body anytime and anywhere in daily life and work. The device not only analyzes the heart health of the human body from the aspect of electrocardiogram, but also comprehensively analyzes the heart health of the user in combination with the heart sound of the human body and the motion and structural state of the heart obtained by ultrasound, so that the monitoring of the heart health is more accurate, and the present invention closely The skin is convenient for data collection, and the close contact area is the I lead position, which can collect clear and complete ECG signals.

The multi-parameter acquisition module includes an ECG acquisition module, a heart sound acquisition module and a thoracic impedance detection module. The heart sound acquisition module collects the first heart sound and the second heart sound, and analyzes the contraction and relaxation of the ventricle in combination with the various stages of the ECG, which can better study the changes of the heart in a cardiac cycle, and observe the heart more intuitively. Structure, movement and comprehensive analysis of the state of the heart.

Claims (7)

1. a flexible biological electric dry electrode detection method and device, is characterized in that, this device comprises: A flexible dry electrode with a layered structure, a bioelectric collector and its base, a self-powered module, and a vital sign detection module are used; wherein, the flexible dry electrode with a layered structure includes a common fabric base layer, polydimethylsiloxane (PDMS) Elastic film layers, stretchable sealing layers, bioelectrically sensitive layers of carbon-silver mixtures (printed circuits). The bioelectric detection method is that a bioelectric collector base is placed on a common fabric base layer, the bioelectric collector base is communicated with the bioelectric collector, and the connecting copper wire and the interface circuit are embedded in the carbon-silver mixture (printed circuit) In the bioelectric sensitive layer of the device, the bioelectric signal acquisition is realized under the drive of the self-powered module and the collected bioelectric signal is transmitted to the bioelectric collector. The flexible dry electrode of the layered structure is realized by means of computer-aided design technology, and the flexible dry electrode is layered and printed on the position where the fabric base layer is in contact with the human body by using the screen printing technology. Bioelectrical dry electrodes and wearable detection devices have the characteristics of low cost, easy mass production and comfortable wearing, and are also convenient for single-lead, standard three-lead, standard three-five-lead, standard twelve-lead ECG and high-density ECG. The application expansion of the electric vest device can also realize the bioelectric detection device of multi-lead EEG cap and EMG sleeve. 2. A flexible bioelectric dry electrode detection method and device as claimed in claim 1, characterized in that: the bioelectric sensitive layer material of the flexible dry electrode adopts a certain proportion of carbon-silver mixture or conductive The thickness of pure silver paste is controlled in a thin layer below 1 mm to maintain a better contact interface with the contacting skin. 3. A flexible biological electric dry electrode detection method and device as claimed in claim 1, characterized in that: the flexible dry electrodes of the layered structure are respectively a fabric base layer and a PDMS elastic film layer from the outside to the inside. , a carbon-silver mixture (printed circuit), and a flexible sensing layer. The outer layer refers to the direction away from the human skin, and the inner layer refers to the direction close to the human skin. The flexible dry electrode and the base of the ECG collector are connected by a copper wire and an interface circuit, which is realized by contact. 4. A flexible bioelectric dry electrode detection method and device according to claim 1, wherein the bioelectric collector adopts three flexible dry electrodes to form a single-lead ECG with high signal-to-noise ratio A detection device, two of which are designed as ECG acquisition electrodes for recording single-lead ECG signals, and the other is designed as a reference electrode for reducing power frequency noise. 5. A flexible biological electric dry electrode detection method and device as claimed in claim 1, characterized in that: the self-powered module adopts a lithium ion battery and a sweat biological battery, wherein the sweat biological battery is used as a kind of self-generated energy. The device uses microbial tissue as a catalyst, and uses lactic acid produced by human sweat as a substrate to power a biological battery, thereby extending the monitoring time of the wearable ECG detection device. 6 . The flexible biological electric dry electrode detection method and device according to claim 1 , wherein the vital sign detection module comprises a heart sound acquisition module and a thoracic impedance detection module. 7 . The thoracic impedance detection module can observe the breathing state of the human body in real time by detecting the change of the thoracic impedance of the human body when breathing, and at the same time, the wearable device can be detected by the thoracic impedance detection module. The heart sound acquisition module collects the first heart sound and the second heart sound, and analyzes the systole and diastole of the ventricle in combination with each stage of the electrocardiogram, which can better study the changes of the heart in a cardiac cycle. 7. A flexible biological electric dry electrode detection method and device as claimed in claim 1, wherein the vital sign detection module amplifies and filters the signal and transmits it to the microprocessor module through A/D conversion, The microprocessor module compresses and packs the data and sends it to the terminal, and the terminal displays the data in real time and performs preliminary analysis and calculation. Among them, there are two data transmission methods: the first is Bluetooth transmission: the packaged ECG signal is connected to the mobile phone through the wireless transmission module, and the mobile phone can receive the data and see the real-time transmitted ECG signal. ; The second is USB transmission. After collecting the ECG signal, remove the ECG collector and connect it to the computer through USB. The computer can perform more complex analysis and processing on the ECG signal.

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