CN204306822U - Wearable electrocardiosignal monitoring device - Google Patents

Abstract

The utility model provides a wearable ECG signal monitoring and processing device. Embed the flexible fabric ECG electrodes and the central control box into the elastic chest strap. The central control box includes an electrocardiographic signal acquisition and conditioning circuit, a signal processing circuit, a data memory, a power supply module and a wireless communication circuit. The signal processing circuit performs signal filtering, feature extraction, and analysis of cardiac abnormalities based on the ECG signals collected, amplified, and pre-filtered by the acquisition and conditioning circuit, and the signal waveform and analysis results are sent to the user's mobile phone through the wireless communication circuit And other personal digital management equipment, and can be sent to remote doctors through the network. The utility model has the characteristics of comfortable wearing, light weight, small volume and low cost, and is convenient for long-term monitoring in daily life, study, activities, etc., and realizes intelligent diagnosis and feedback treatment of heart conditions.

Description

Wearable ECG Signal Monitoring Device

technical field

The utility model relates to the technical field of wearable health care, in particular to a wearable ECG signal monitoring and processing device.

Background technique

In recent years, as the prevalence of chronic diseases headed by cardiovascular diseases among the elderly has increased, and they have the characteristics of complex etiology and illness, long duration of illness, high medical costs, and the need for long-term management, etc., more and more Many patients expect to change the health care model from hospital-centered to family-centered, and to curb the rapid rise of chronic diseases in the elderly through personal health management, thereby reducing the medical economic burden. The very important ECG signal is of great significance in the monitoring and treatment of heart disease and other chronic diseases. It is one of the earliest bioelectrical signals studied and applied in clinical medicine. The dynamic electrocardiogram is an important objective basis for clinical analysis of the disease and establishment of a diagnosis, including ECG data under different conditions such as rest, activity, work, study, and sleep. It can more completely record the heart condition and provide a more accurate basis for diagnosis. The large ECG monitoring equipment in the hospital is bulky and requires at least 12 connecting wires for measurement, which brings discomfort to the patient and increases the cost of medical treatment; on the other hand, the ECG sensor directly affects the monitoring signal quality and wearing comfort Especially for long-term real-time monitoring, the material and structure of the electrode are very important. At present, the clinical ECG electrode is a wet electrode with electrolytic gel, which will cause skin allergies and signal attenuation due to skin dehydration, so it is not suitable for use for long-term supervision.

In view of the above problems, a variety of ECG monitoring devices based on wearable fabric electrodes have been proposed in China. Chinese Patent No. 200920089699.8 discloses a wearable ECG electrode vest with a data recording device. The electrodes are woven from silver and composite fibers. It can collect and send the collected ECG signals; Chinese Patent No. 201120506497.6 discloses a wearable ECG signal measuring device, and ECG electrodes can collect signals, process and send them, and can obtain ECG signals and heart rate values; patent No. 201120303457.1 discloses a wearable clothing for detecting human ECG signals. The ECG electrodes are sewn on the clothes by conductive cloth, and the ECG signal processing circuit and transmitter are placed in a housing. The data can be used by patients or doctors. Provide medical references.

Although the above patents are based on wearable technology using flexible fabric electrodes, which can successfully achieve the purpose of long-term monitoring of ECG signals, fabric electrodes are relatively complicated to manufacture, and even require manufacturing equipment to complete. Detection of ECG in the case of human activity will bring a lot of motion artifact interference. Unlike other interferences that have a specific frequency range, it has a dynamic frequency range and a large amplitude, which can easily damage or overwhelm biological signals, which will lead to unreasonable processing and wrong diagnosis, and bring great challenges to monitoring. Motion artifacts can largely interfere with the validity of the ECG signal, possibly leading to wrong evaluation of ECG signal parameters and triggering of false alarms. Therefore, how to effectively suppress motion artifacts in dynamic ECG signals is a key issue that must be solved in wearable health monitoring.

Utility model content

In order to solve the above problems, the utility model provides a wearable ECG signal monitoring and processing device, which can monitor the heart activity status of the human body anytime and anywhere without hindering daily activities.

A wearable ECG signal monitoring device is characterized in that:

A wearable ECG signal monitoring device, the monitoring device is composed of a chest strap, a flexible fabric ECG electrode, a central control box and an internal connection; it is characterized in that: the flexible fabric ECG electrode is arranged on the inner side of the chest strap Position, and the electrodes are protruding settings, so as to ensure that the electrodes are in full contact with the skin; the internal connection line connects the flexible fabric ECG electrodes and the central control box; the central control box is embedded in the elastic chest strap; the internal connection line adopts Conductive wire or conductive fiber, and sew ordinary yarn to cover it on the interconnection, forming the interconnection track.

Preferably, the central control box includes an ECG signal acquisition and conditioning circuit, an acceleration acquisition circuit, a signal processing circuit, a wireless communication circuit, a memory, and a power supply module.

Preferably, the ECG signal acquisition and conditioning circuit and the acceleration acquisition circuit are electrically connected to the signal processing circuit respectively, the acceleration acquisition circuit transmits the collected acceleration signal to the signal processing circuit, and the ECG signal acquisition and conditioning circuit acquires the heart The electrocardiographic signal is processed, and the processed electrocardiographic signal is transmitted to the signal processing circuit after gain amplification processing.

Preferably, the signal processing circuit is electrically connected to the memory and the wireless communication circuit respectively, the signal processing circuit has a built-in AD conversion circuit, and the signal processing circuit filters the ECG signal according to the acceleration signal collected by the acceleration acquisition circuit, Feature extraction and analysis of cardiac abnormalities, and transfer the results to the memory and wireless communication circuit respectively; the wireless communication circuit is used to send the processed data to the receiving terminal in a wireless manner for human physiology and activity Condition observation and disease analysis and diagnosis.

Preferably, the power module is electrically connected with the electrocardiographic signal acquisition and conditioning circuit, the signal processing circuit, the wireless communication circuit, and the acceleration acquisition circuit respectively, so as to supply power to the device.

Preferably, the monitoring device adopts a single-channel lead detection method, and at least three flexible fabric ECG electrodes are arranged on the chest strap, two of which correspond to the left chest and the right chest.

Preferably, the acceleration signal collected by the acceleration collection circuit is used for suppression of motion artifact interference.

Preferably, the flexible fabric ECG electrode is formed in the following manner: the elastic fabric is fixed on the chest strap through adhesive bonding or sewing technology, and the conductive liquid is printed or directly coated on the elastic fabric to form an elastic fabric electrode layer.

Preferably, the receiving terminal is a mobile terminal, PC, personal digital assistant, notebook computer, or tablet computer.

Preferably, the shape of the flexible fabric ECG electrode is circular, oval or polygonal.

Preferably, the ECG signal filtering circuit, the signal feature extraction circuit, and the cardiac abnormality diagnosis circuit are electrically connected in sequence.

Preferably, the power module includes a battery and a battery management circuit, and the battery management circuit adopts an LDS3985M33R power management chip.

Preferably, the acceleration acquisition circuit adopts MMA7260Q chip.

Preferably, the chest strap is made of elastic material, and the connecting buckle of the chest strap is designed in several different gear positions for adjusting the tightness of the chest strap. For the convenience of setting the shapes of different chest straps, the shape of the flexible fabric ECG electrodes can be set to shapes such as circles, ovals or polygons, and can also be set in ways such as beautified patterns.

Preferably, the signal processing circuit includes:

The ECG signal filter circuit is electrically connected with the ECG signal acquisition and conditioning circuit and the acceleration acquisition circuit, and suppresses the motion artifact interference noise generated by the human body under exercise conditions through an adaptive filter, in which the acceleration signal is used as the adaptive filter The reference signal of the device. The signal feature extraction circuit is electrically connected with the ECG signal filter circuit, and extracts important signal features from the filtered ECG signal. The signal features at least include characteristic indicators such as R wave and heart rate with the largest amplitude. These indicators can be based on Modifications may be made according to user requirements, and no limitation will be given here and details will be described here. The cardiac abnormality diagnosis circuit is used to detect the parameter value of each feature of the ECG signal, analyze these signal features in the time domain and frequency domain, obtain the statistical indicators of the ECG signal, and classify and analyze the user's heart state.

In addition, in the device described in the present invention, the process of specifically realizing the collection, processing and sending of ECG signals between each circuit module is as follows:

1), signal acquisition and conditioning

The electrocardiographic signal is collected through the electrocardiographic signal acquisition and conditioning circuit, and the collected electrocardiographic signal is initially processed to eliminate interference noise such as myoelectric interference, power frequency interference and baseline drift; and the acceleration signal is collected through the acceleration acquisition circuit.

2), motion artifact suppression

For the ECG signal obtained in step 1), an adaptive filter is used to suppress the motion artifact interference noise generated by the human body in motion.

3), signal feature extraction

With the ECG signal obtained in step 2) after motion artifact suppression, important signal features are extracted through the signal feature detection circuit, the signal features at least include characteristic indicators such as R wave and heart rate with the largest amplitude, and these indicators can be based on Modifications may be made according to user requirements, and no limitation will be given here and details will be described here.

4) Analysis and evaluation of heart disease

The signal characteristics of the ECG signal obtained in step 3) are analyzed in time domain and frequency domain.

Additionally, the process may further include:

5) Send the ECG signal after signal processing and the analysis result of the user's heart state to the doctor through wireless, and the doctor will feedback the diagnosis result and the suggestion of disease prevention.

The wearable ECG signal monitoring device of the utility model can monitor the heart activity of the wearer for a long time when the wearer performs daily life, study and exercise. The beneficial effect of above-mentioned technical scheme is as follows:

(1) Electrocardiographic electrodes are made by using conductive materials that are electrically stimulated to change their electrical characteristics. The material is soft and has no irritation to the skin, which is convenient for users to wear for a long time and can be washed repeatedly;

(2) The central node embedded in the chest strap is light in weight and low in power consumption;

(3) It can detect the ECG signal of the user in the state of exercise in real time, the signal transmission is stable, the ECG waveform is clear, and the noise is less, which is convenient for the feature detection of the signal;

(4) The processed signal can be intelligently analyzed to generate diagnostic results, and wirelessly transmitted to mobile phones, tablet computers or personal management devices in real time, so that users can know their heart conditions in real time;

(5) The signal and analysis results are transmitted to the diagnosis and treatment doctors through the network, and the doctors evaluate the diagnosis results and provide scientific treatment suggestions to the patients.

(6) Compared with the feature detection of the above-mentioned signals realized by means of an improved algorithm in the prior art, the monitoring device is realized by a hardware control circuit based on DSP, which greatly improves the processing efficiency and accuracy of the signal.

Description of drawings

Figure 1 is a schematic structural diagram of a wearable ECG monitoring chest strap;

Fig. 2 is a schematic diagram of the structure of a wearable ECG electrode;

Fig. 3 is a functional block diagram of a wearable ECG monitoring device;

Fig. 4 is a block diagram of a signal processing module of a wearable ECG monitoring device;

Figure 5 is a block diagram of wearable ECG motion artifact suppression.

Among them, 1-elastic chest strap; 2-conductive fabric electrode; 3-central control box; 4-fabric; 5-fabric electrode layer; 6-ECG signal acquisition and conditioning circuit; 7-acceleration acquisition circuit; 8-signal processing circuit 9-wireless communication circuit; 10-data memory; 11-power supply module; 12-ECG signal filter circuit; 13-signal feature extraction circuit; 14-cardiac abnormality diagnosis circuit.

Detailed ways

In order to make the technical problems, technical solutions and advantages to be solved by the utility model clearer, the following will describe in detail with reference to the drawings and specific embodiments.

The utility model aims at the problems that the existing wearable ECG acquisition and measurement device has complex ECG electrode production process, requires large-scale manufacturing equipment, high cost, intelligently detects ECG signals in the static state of the user, and lacks intelligent diagnosis and treatment functions, etc., and provides A wearable electrocardiographic monitoring diagnosis and treatment method and device that are simple in manufacturing process and low in cost and can be used for a long time in the conditions of daily life, study, activity and sleep of the user.

As shown in FIG. 1 , the wearable ECG monitoring device of the present invention includes an elastic chest strap 1 , conductive fabric electrodes 2 , a central control box 3 and interconnecting wires.

The chest strap is made of elastic material, and the connecting buckle of the chest strap is designed into several different positions, so that the tightness of the strap can be adjusted, which is suitable for different fat and thin users, and is easy to wear. Then fasten it. Since the main purpose of this device is to identify the cardiac cycle and analyze the heart rate, a single-channel lead detection method is adopted, and at least three fabric electrodes are arranged on the chest strap, and the shape of the fabric electrodes can be circular, oval or polygonal. Place two of the fabric electrodes on the left and right chest while wearing the chest strap. The central control box is placed in the small pocket of the chest strap and wraps around the user's back along with the chest strap. The central control box is connected to the fabric electrodes through the internal connection line. The internal connection line is made of wire or conductive fiber with better elasticity and thinner size. It is covered by sewing on the inner connecting line to form a regular inner connecting track.

As shown in Figure 2, the textile electrode of the present invention adopts the method of printing or directly coating the conductive liquid. Compared with the woven electrode, the manufacturing process is simple and does not require large-scale manufacturing equipment, so the cost is lower. Utilize the elastic force of fabrics with good elasticity such as sponge to ensure that the conductive part can fully contact with human skin, and the fabric 4 (such as sponge) with a designed shape is glued by adhesive or sewn on the chest strap 1 by needle and thread. The non-irritating conductive liquid to the skin is printed or directly coated on the fabric 4 to form the fabric electrode layer 5 .

As shown in Figure 3, the hardware circuit structure of the central control box of the wearable ECG monitoring device includes an ECG signal acquisition and conditioning circuit 6, an acceleration acquisition circuit 7, a signal processing circuit 8, a wireless communication circuit 9, a data memory 10 and a power module 11.

Wherein the electrocardiographic signal acquisition conditioning circuit 6 amplifies and filters the electrocardiographic signal, selects a suitable gain to reach the voltage of AD conversion, and preliminarily eliminates interference noises such as myoelectric interference, power frequency interference and baseline drift through the filter circuit; the acceleration acquisition circuit 7 (can realize based on the converter of V/F converter AD7742 or other similar performances) gather the acceleration signal of human body, can provide reference signal for the filtering of motion artifact; Signal processing circuit 8 (adopts DSP processor, preferably selects U.S. The TMS320 series DSP produced by TI, such as TMS320C6000) has a built-in AD conversion circuit, which converts the analog signal into a digital signal and processes it through the signal processing circuit. It mainly performs noise filtering, signal feature extraction and calculation, and heart rate variation analysis. The memory 10 stores the collected data in a portable storage medium for the doctor to analyze the disease; the processed data is sent to the user's mobile phone, tablet computer or personal management device in a wireless manner through the wireless communication circuit 9 for The user observes his heart condition in real time; the power supply module 11 provides electric energy for the ECG signal acquisition and conditioning circuit 6 , the acceleration acquisition circuit 7 , the signal processing circuit 8 and the wireless communication circuit 9 . The power module 11 includes a battery and a battery management circuit, wherein the battery management circuit can use an LDS3985M33R power management chip.

As shown in FIG. 4 , the signal processing circuit of the wearable ECG monitoring device includes an ECG signal filtering circuit 12 , a signal feature extraction circuit 13 and a cardiac abnormality diagnosis circuit 14 .

Electrocardiographic signal filtering circuit 12 filters the noise that cannot be completely filtered out in the hardware filtering method, wherein, because the motion artifact interference belongs to a non-stationary random signal and has a dynamic frequency range, an adaptive filter is used for filtering in the utility model , using the acceleration signal that has correlation with the motion artifact signal as the reference signal of the adaptive filter to realize the real-time ECG monitoring of the user in the motion state; the signal feature extraction circuit 13 adopts the signal feature detection algorithm from the filtered Extract important signal features in the ECG signal, such as the R wave with the largest amplitude, heart rate, etc.; the cardiac abnormality diagnostic circuit 14 analyzes the signal features in the time domain and frequency domain, and obtains statistical indicators about the ECG signal. Classification and identification of the cardiac state of the heart, and can also be sent to the doctor through the wireless communication circuit 9, and the doctor will feedback the diagnosis result and the suggestion of disease prevention.

As shown in Figure 5, the human body dynamic electrocardiogram signal that utilizes fabric electrode to collect is as the input signal source 14 of filter, and it is the combined signal of ideal electrocardiogram signal and motion artifact noise, will be collected synchronously with dynamic electrocardiogram signal The three-axis acceleration signal 15 is used as the reference signal of the adaptive filter, and then the adaptive filter 16 is used to suppress motion artifacts to obtain relatively pure ECG signals.

In addition, in the device described in the present invention, the process of specifically realizing the collection, processing and sending of ECG signals between each circuit module is as follows:

1), signal acquisition and conditioning

Acquire ECG signals through the ECG signal acquisition and conditioning circuit, and preliminarily eliminate interference noise such as myoelectric interference, power frequency interference, and baseline drift for the collected ECG signals; and acquire acceleration signals through the acceleration acquisition circuit;

2), motion artifact suppression

For the electrocardiographic signal obtained in step 1), an adaptive filter is used to suppress the motion artifact interference noise generated by the human body under motion conditions;

3), signal feature extraction

With the ECG signal obtained in step 2) after motion artifact suppression, important signal features are extracted through the signal feature detection circuit, the signal features at least include characteristic indicators such as R wave and heart rate with the largest amplitude, and these indicators can be based on The user needs to modify, no longer limit and repeat here;

4) Analysis and evaluation of heart disease

The signal characteristics of the ECG signal obtained in step 3) are analyzed in time domain and frequency domain.

In addition, the method may further include:

5) Send the ECG signal after signal processing and the analysis result of the user's heart state to the doctor through wireless, and the doctor will feedback the diagnosis result and the suggestion of disease prevention.

The above description is a preferred embodiment of the present application, and it should be pointed out that for those of ordinary skill in the art, some improvements and modifications can also be made without departing from the principles described in the application. These improvements and modifications It should also be regarded as the protection scope of the present application.

Claims (15)

1. A wearable ECG signal monitoring device, said monitoring device is made up of chest strap, flexible fabric ECG electrode, central control box and interconnection wire; It is characterized in that: The flexible fabric ECG electrode is arranged at an appropriate position inside the chest belt, and the electrode is provided as a protrusion, thereby ensuring complete contact between the electrode and the skin; The internal connecting line connects the flexible fabric ECG electrodes and the central control box; The central control box is embedded in the elastic chest strap; The interconnection wire adopts wire or conductive fiber, and ordinary yarn is sewn on the interconnection wire to cover it to form an interconnection track. 2. The device according to claim 1, characterized in that: The central control box includes an electrocardiographic signal acquisition and conditioning circuit, an acceleration acquisition circuit, a signal processing circuit, a wireless communication circuit, a memory, and a power supply module. 3. The device according to claim 2, characterized in that: The electrocardiographic signal acquisition and conditioning circuit and the acceleration acquisition circuit are respectively electrically connected to the signal processing circuit, the acceleration acquisition circuit transmits the acquired acceleration signal to the signal processing circuit, the electrocardiographic signal acquisition and conditioning circuit acquires the electrocardiographic signal, And the processed electrocardiogram signal is transmitted to the signal processing circuit after gain amplification processing. 4. The device according to claim 2, characterized in that: The signal processing circuit is electrically connected with the memory and the wireless communication circuit respectively, the signal processing circuit has a built-in AD conversion circuit, and the signal processing circuit performs filtering, feature extraction and Analyze the heart abnormality, and transmit the results to the memory and wireless communication circuit respectively; The wireless communication circuit is used to wirelessly send the processed data to the receiving terminal for observation of human physiology and activity status and analysis and diagnosis of diseases. 5. The device according to claim 2, characterized in that: The power supply module is electrically connected with the electrocardiographic signal acquisition and conditioning circuit, the signal processing circuit, the wireless communication circuit, and the acceleration acquisition circuit to supply power for the device. 6. The device according to claim 1, characterized in that: The monitoring device adopts a single-channel lead detection method, and at least three flexible fabric ECG electrodes are arranged on the chest belt, two of which correspond to the left chest and the right chest. 7. The device according to claim 2, characterized in that: The acceleration signal collected by the acceleration collection circuit is used for suppression of motion artifact interference. 8. The device according to claim 1, characterized in that: The flexible fabric ECG electrode is formed in the following manner: the elastic fabric is fixed on the chest belt through adhesive bonding or sewing technology, and the conductive liquid is printed or directly coated on the elastic fabric to form an elastic fabric electrode layer. 9. The device according to claim 4, characterized in that: The receiving terminal is a mobile terminal, PC, personal digital assistant, notebook computer, or tablet computer. 10. The device of claim 1, wherein: The shape of the flexible fabric ECG electrode is circular, oval or polygonal. 11. The apparatus of claim 2, wherein the signal processing circuit comprises: ECG signal filter circuit, signal feature extraction circuit, cardiac abnormality diagnosis circuit, the above three circuits are electrically connected in sequence. 12. The device of claim 2, wherein: The power module includes a battery and a battery management circuit. 13. The device of claim 12, wherein: The battery management circuit adopts LDS3985M33R power management chip. 14. The device of claim 2, wherein: The acceleration acquisition circuit adopts MMA7260Q chip. 15. The device according to any one of claims 1-14, characterized in that: The chest strap is made of elastic material, and the connecting buckle of the chest strap is designed into several different gears for adjusting the tightness of the chest strap.