CN111657917A - Dry electrode electrocardiogram detector - Google Patents

Abstract

The invention discloses a dry electrode electrocardiogram detector. The electrocardiogram detector is a 3-lead electrocardiogram detector and comprises 4 dry electrodes, a low noise amplifier, an ECG signal processor, a digital filter, an MCU (microprocessor), a memory, a Mini USB interface, a lithium battery, a battery monitoring circuit, an LED indicator lamp, a key switch, a Bluetooth/WiFi module, an NFC module and an antenna. The dry electrode is mounted on the housing and forms a compact structure with the electrocardiograph. When in use, the electrocardiogram signal is directly detected by clinging to the skin surface of a human body.

Description

Dry electrode electrocardiogram detector

Technical Field

The invention relates to the field of intelligent medical treatment and mobile medical treatment, in particular to a dry electrode electrocardiogram detector.

Background

Most sudden heart diseases can be observed through the electrocardiogram, and emergency treatment measures are taken to save lives of patients. However, in the case of a heart attack, electrocardiographic events occur in short durations and are sudden and they often occur only infrequently, which is particularly difficult for a cardiologist to observe. Therefore, a portable electrocardiogram detector which can detect the electrocardiogram of the patient by the patient and is simple and convenient to use is needed, and when the patient breaks out of heart diseases, the electrocardiogram detector can record the electrocardiogram signals of the patient timely and accurately, and can automatically diagnose, alarm and obtain the diagnosis suggestions of doctors in time.

The existing portable electrocardiogram detector is a reduced version of the traditional medical electrocardiogram detector, and the portable electrocardiogram detector is gradually miniaturized in size and convenient to carry through the progress of electronic technology and integrated circuits, and can be used in doctors' offices, clinics and/or other medical places. Such conventional portable electrocardiograph devices are non-mobile electrocardiograph detection devices that can be used to collect patient ECG data for detecting abnormalities in the electrical activity of the patient's heart. However, it is troublesome to carry the patient at any time and any place and to detect the electrocardiogram signal by himself. The multi-lead electrodes are required to be arranged at fixed positions of a human body, and in order to ensure the detection sensitivity, a conductive liquid and the like need to be smeared, so that the accuracy and reliability of signals during the self detection of electrocardiogram signals are difficult to ensure.

In the conventional electrocardiogram detector, a measuring electrode is attached to a standard electrocardiogram detection point of a human body to detect an electrocardiogram signal. Generally, there are 12 leads in the medical electrocardiogram detector, because the electrodes are placed at different points on the skin surface of human body, the measured signals respectively reflect the depolarization, repolarization, conduction and atrial depolarization and repolarization of ventricles. The traditional measurement method interferes with the normal life of the patient and limits the mobility of the electrocardiogram detector.

In order to solve the problems, the invention discloses a dry electrode electrocardiogram detector. The portable electrocardiogram detector is convenient to carry and simple to use, and a user can detect the electrocardiogram anytime and anywhere.

The direct benefits of the invention are: a dry electrode electrocardiogram detector is convenient to move, so that families and individuals do not need to accurately detect the electrocardiogram at any time and any place under the hospital environment. The dry electrode electrocardiogram detector realizes the instant detection of 3-lead ECG signals through 4 dry electrodes, has the advantages of convenient use and high detection precision, and subverts the mode that the traditional electrocardiogram detection needs to go to a hospital and needs the operation of a professional doctor. The dry electrode electrocardiogram detector is low in manufacturing cost, convenient to carry, and combined with a smart phone, and through APP, the cloud diagnosis platform realizes automatic analysis and diagnosis, monitoring alarm, ECG detection result sharing, remote expert diagnosis and the like.

Disclosure of Invention

The invention discloses a dry electrode electrocardiogram detector. The electrocardiogram detector comprises: 4 dry electrode, low noise amplifier, ECG signal processor, digital filter, MCU (microprocessor), memory, Mini USB interface, lithium cell, battery monitoring circuit, LED pilot lamp, key switch, bluetooth/wiFi module, NFC module and antenna:

in one possible implementation mode of the invention, the dry electrode is directly contacted with the skin surface of the human body to detect the electrocardiogram potential change of the skin surface of the human body;

the low-noise amplifier is used for amplifying weak electrocardiogram potential change signals detected by the dry electrode under the condition of introducing noise as little as possible, so that the electrocardiogram signals can be further processed conveniently;

the ECG signal processor includes an amplifier, a filter and an analog-to-digital converter (ADC) for processing an input analog electrocardiogram signal into a digital electrocardiogram signal;

the digital filter is used for filtering various noise interferences, such as power frequency noise, muscle noise, baseline drift, high-frequency noise and the like;

the MCU (microprocessor) is used for controlling ECG signal acquisition, driving the LED display lamp, acquiring a key switch signal, controlling a power switch and controlling the data transmission module to complete data transmission;

the memory is used for storing firmware (firmware) and temporarily storing the acquired electrocardiogram signals;

the Mini USB interface is used for data communication and power supply charging;

the lithium battery is used for supplying power to the system, and the lithium battery can be repeatedly charged after the power supply is consumed;

the battery monitoring circuit is used for monitoring and controlling the battery state;

the LED indicating lamp is used for indicating the on-off state and the battery state of the power supply;

the key switch is used for switching on and off the electrocardiogram detector;

the Bluetooth/WiFi module and the antenna are used for transmitting electrocardiogram digital data;

the NFC module and the antenna are used for awakening the smart phone App and achieving Bluetooth rapid pairing.

Preferably, all the components of the electrocardiograph are mounted on a PCB to form an integral structure, i.e. PCBA.

Preferably, there are 4 electrode tabs on the PCBA for mounting the dry electrodes.

Further, the dry electrode was mounted on the electrode button of the PCBA through 4 holes in the bottom of the housing. When detecting ECG signals, the dry electrode on the shell is directly placed in front of the chest and directly contacted with the skin tightly, and 3-lead ECG signals are detected.

Further, the electrocardiogram detector transmits the digital ECG signal data of the ECG processor to a smart phone or directly transmits the digital ECG signal data to a cloud terminal through a Bluetooth or WiFi module.

Furthermore, the electrocardiogram detector is powered by a lithium battery, so that power frequency interference of a power supply can be effectively eliminated. In order to save energy consumption, the battery can be used for a long time after being fully charged once.

Further, a battery monitoring circuit in the electrocardiogram detector detects and manages the charging and discharging of the battery; and carrying out power intelligent management on a Bluetooth data transmission mode, a startup and shutdown and the like.

Preferably, the filter is composed of a plurality of filters, and filters random interferences such as myoelectric interference, respiration interference, motion interference, electrode polarization interference and the like in electrocardiographic measurement.

Preferably, the filter is a digital filter, and various desired functions may be implemented by programming.

Further, the a/D digitizer can convert the analog signal into a digital signal with a required accuracy, and the bandwidth of the digital signal is calculated by the following formula:

signal bandwidth = bxcxx S

Here, B is sampling precision, typically 24-bit precision; c is the number of channels, here 3, S is the sampling frequency, typically 250Hz, the lower the sampling frequency the better the suppression of high frequency noise.

As a third preferred scheme, the electrocardiograph detector controls the whole electrocardiograph acquisition, data storage and data transmission through an MCU (microprocessor), electrocardiograph signals are temporarily stored in a local memory during the acquisition process, and after the electrocardiograph signals are acquired, the electrocardiograph signals are sent to a smart phone or a cloud terminal through bluetooth or WiFi for further processing.

Furthermore, the microprocessor adopts embedded software programming without an operating system, so that the power consumption is low and the processing speed is high.

In a possible implementation manner of the invention, the MCU interacts with the smartphone App through the bluetooth module, and is controlled by the smartphone App.

Further, the NFC module of electrocardiogram detector utilizes "NFC with the bluetooth" the cell-phone with realize quick data interaction between the electrocardiogram detector, has saved the loaded down with trivial details process of pairing of bluetooth technique. The method and the device enable users with weak technical backgrounds to be convenient to use and obtain better user experience. When the electrocardiogram detector is close to the mobile phone with the installed APP, the NFC function automatically wakes up the mobile phone APP to perform electrocardiogram automatic detection.

The invention has the beneficial effects that: provides a dry electrode electrocardiogram detector, which adopts a dry electrode to directly detect electrocardiogram. Has the characteristics of small volume, compact structure and convenient carrying. The patient can detect the electrocardiogram by himself at any time and any place. Breaks through the barrier that the traditional electrocardiogram detection needs a mechanism with medical conditions and is performed under the operation of professional personnel. The method is beneficial to realizing household and personal mobile intelligent medical treatment.

Drawings

FIG. 1 is a schematic diagram of a dry electrode ECG monitor in accordance with a preferred embodiment of the present invention;

FIG. 2 is a block diagram of a dry electrode ECG monitor according to a preferred embodiment of the present invention;

FIG. 3 is a flowchart of a dry electrode ECG monitor operation according to a preferred embodiment of the present invention;

FIG. 4 is a schematic diagram of a dry electrode ECG monitor according to a preferred embodiment of the present invention.

Detailed Description

The invention will now be described in further detail with reference to the drawings and preferred embodiments. The drawings are simplified schematic diagrams illustrating the basic principles, basic structures and basic functions of the present invention in a schematic manner, and thus show only the constituents related to the present invention.

One of ordinary skill in the art may recognize certain variations and equivalents of the invention, which should not be construed as beyond the scope of the invention.

FIG. 1 is a schematic diagram of a dry electrode ECG monitor in accordance with a preferred embodiment of the present invention. As shown in fig. 1:

a group of dry electrodes 1 for detecting electrocardiogram signals on the surface of human skin, which directly contact with the surface of human skin to detect the electrocardiogram potential change on the surface of human skin;

a group of low noise amplifiers 2, which is used for amplifying weak electrocardiogram potential change signals detected by the dry electrodes under the condition of introducing noise as little as possible, so as to be convenient for further processing the electrocardiogram signals;

an ECG signal processor 3, which is composed of an amplifier, a filter and an analog-to-digital converter (ADC), for processing an input analog electrocardiogram signal into a digital electrocardiogram signal;

the digital filter 4 is used for filtering various noise interferences, such as power frequency noise, muscle noise, baseline drift, high-frequency noise and the like;

the MCU (microprocessor) 5 is used for controlling ECG signal acquisition, driving the LED display lamp, acquiring key switch signals, controlling a power switch and controlling the data transmission module to complete data transmission;

the memory 6 is used for storing firmware (firmware) and temporarily storing the acquired electrocardiogram signals;

the lithium battery 7 is used for supplying power to the system, and can be repeatedly charged after the power supply is consumed;

a Mini USB interface 8 for data communication and power charging;

a battery monitoring circuit 9 for monitoring and controlling the battery state;

the LED indicator light 10 is used for indicating the power switch state and the battery state;

a key switch 11 for turning on and off the electrocardiograph detector;

the Bluetooth/WiFi module 12 and the antenna 14 are used for transmitting electrocardiogram digital data;

and the NFC module 13 and the antenna 14 are used for awakening the smart phone App and realizing Bluetooth rapid pairing.

FIG. 2 is a block diagram of a dry electrode ECG monitor according to a preferred embodiment of the present invention. As shown in fig. 2:

the PCBA board 21 is used for mounting all components of the electrocardiogram detector;

an electrode button 22 on the PCBA for connecting the PCBA and the dry electrode;

the lithium battery 23 is used for supplying power to the electrocardiogram detector, and the lithium battery 23 can be charged repeatedly to ensure that the electrocardiogram detector supplies power;

the lower half part 24 of the electrocardiogram detector shell is used for installing and fixing the PCBA 21 and the dry electrode 25;

and 26 is a bottom view of the lower half of the housing. The PCBA 21 is placed into the bottom half of the housing from above, with the electrodes of 21 facing downward. 25 pass upward from the bottom of the lower half of the housing and are fastened into 22, 25 and 22 and act as a fastening for 21. Since the dry electrode 25 is in direct contact with the PCBA electrode button 22, the use of lead cables as in conventional ECG measurements is avoided, thereby also reducing noise interference introduced by the cables.

FIG. 3 is a flow chart of a dry electrode ECG monitor according to a preferred embodiment of the present invention. As shown in fig. 3: a process S01, turning on the switch of the electrocardiogram detector; process S02: the system starts initialization and calls the firmware FW stored in the memory; process S03: the system automatically searches the intelligent terminal Bluetooth with the App, and is connected and paired with the intelligent terminal Bluetooth; the process S04, the electrocardiogram detector is started to connect and is ready to start detecting ECG; a process S05, wherein, if the instruction for starting measurement is received, if not, the process continues to return to the process S04 to wait for measurement; if the result of S05 is that a start measurement instruction is received; proceeding to S06, recording ECG detection data is started; process S07: whether an ECG detection ending instruction is received, if not, returning to S06, and continuing to record ECG measurement data; if the result of S07 is YES, ending the ECG measurement recording; process S08: uploading ECG measurement data; process S09: the ECG test ends.

FIG. 4 is a schematic diagram of a dry electrode ECG monitor according to a preferred embodiment of the present invention. The electrocardiogram detector clings 4 dry electrodes to the surface of the human chest skin for electrocardiogram detection, as shown in fig. 3: 401 is a schematic diagram of a detected human body and a detected part; 402 is the electrocardiograph detector; and 25 is a dry electrode of the electrocardiograph. During detection, the electrocardiogram detector is firstly opened, and then the electrocardiogram detector is placed and pressed tightly as shown in fig. 3, so that electrocardiogram detection can be started. And after the detection is finished, taking off the electrocardiogram detector, finishing the data uploading, and turning off the electrocardiogram detector after the detection is finished.

In light of the above-described embodiments of the present invention, it is clear that many modifications and variations can be made by the worker skilled in the art without departing from the scope of the present invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims (5)

1. A dry electrode electrocardiography meter, comprising: 4 dry electrodes, low noise amplifier, ECG signal processor, digital filter, MCU (microprocessor), memory, Mini USB interface, lithium cell, battery monitoring circuit, LED pilot lamp, key switch, bluetooth/wiFi module, NFC module and antenna.

2. The dry electrode electrocardiogram detector of claim 1 wherein the low noise amplifier, ECG signal processor, digital filter, MCU (microprocessor), memory, Mini USB interface, battery monitoring circuit, LED indicator, key switch, bluetooth/WiFi module, NFC module and antenna and related components are mounted on PCB board and assembled into PCBA.

3. The dry electrode electrocardiographic monitor according to claim 1 wherein the 4 dry electrodes are used to detect ECG signals from the skin surface of the human body and are connected directly through the holes in the housing to the electrode tabs on the PCBA, which improves the detection sensitivity and eliminates external electromagnetic noise and other signal noise interference introduced by the cable connection.

4. The dry electrode electrocardiogram detector according to claim 1, wherein said 4 dry electrodes are tightly connected with said electrodes soldered on the PCB board directly through the holes of the base of the housing, so as to fix the PCBA board and make said electrodes and the housing as a whole, and the use is simple and convenient.

5. The dry electrode electrocardiograph detector according to claim 1 wherein the NFC module enables fast data interaction between the electrocardiograph detector and a mobile phone, automatically wakes up an App, and enhances user experience and test convenience.

Images