CN201127603Y - A hand-held electrocardiogram detector - Google Patents

Abstract

The utility model relates to a portable electrocardiogram detector. The existing electrocardiogram detector is not suitable for home use due to inconvenient portability and high price. The casing of the utility model is provided with a liquid crystal display screen, a switch button, a start measurement button, a stop measurement button, a data upload button, and a USB interface. The housing is provided with a microprocessor, a FLASH memory and a function key circuit which are signally connected to the microprocessor. The differential amplifier circuit, the band-pass filter circuit, the in-phase amplifier circuit and the A/D conversion circuit are serially connected in series, wherein the signal output terminal of the A/D conversion circuit is connected to the microprocessor, and the differential amplifier circuit is connected to the left-hand ECG electrode and the right-hand ECG electrode respectively. electrode connection. The utility model collects electrocardiographic signals by using the way of hand contact with electrodes, the measurement method is convenient, and the utility model is suitable for family and long-term stable monitoring and detection.

Description

A hand-held electrocardiogram detector

technical field

The utility model belongs to the technical field of medical electronic equipment, in particular to a portable electrocardiogram detector that can display electrocardiogram waveforms in real time, has functions of automatic electrocardiogram analysis, detection, data storage, and arrhythmia diagnosis.

Background technique

Cardiovascular disease seriously endangers people's health, and most of cardiovascular diseases are related to arrhythmia. In order to be able to make a diagnosis of an arrhythmia, it is necessary to use the patient's electrocardiogram. The basic principle is: the heart is stimulated by the potential generated by itself, so that the excitement generated by the sinoatrial node turns to the cardiomyocytes in the atrium and ventricle in turn. This weak bioelectricity can be measured on the surface of the human body, that is, the ECG signal. When we use two or three electrodes to form a loop on the surface of the body and get the ECG signal after amplifying and processing.

The most common detection method in the hospital is to use an electrocardiogram machine, which can precisely record the ECG waveform for a period of time, but due to the uncertainty of the occurrence of heart disease, abnormal waveforms may not necessarily appear when using an electrocardiogram machine to measure , this method has certain limitations. There is also the use of ambulatory monitoring systems to obtain ECG information, such as Holter. The patient wears the handset for a long time (about 24 hours), continuously records the dynamic ECG information, and takes it back to the hospital for analysis of the ECG data by the host system; or records the ECG when the user feels unwell, and then passes it through a PC or Upload by phone; or take it directly to the hospital to the doctor as a basis for diagnosis. The disadvantage of this method is: poor real-time performance, the sub-machine part can only display, record or transmit, and has no analysis function. Of course, the host of the monitoring system can analyze and detect ECG signals, but because of its high price, ordinary patients cannot afford it at all.

At present, the products with ECG detection and analysis functions on the market are mainly hospital-oriented monitoring systems, but for individual patients, there are no products with analysis functions that can only record and store ECG. However, most patients do not understand the specific meanings of various actual ECG waveforms, so they can only turn to doctors, which greatly reduces the practical value of this monitoring product. , an important reason for opening the home market.

In addition, when electrocardiographs or ECG monitors are used in hospitals, in order to ensure that better ECG signals can be extracted, special electrodes (such as Ag-Agcl electrodes) are usually connected to chest leads or limb leads. ), or clamp the wrist and ankle with the ECG clip; then connect it through the lead wire. However, this practical application will greatly affect the user's activities, which will be inconvenient and not conducive to long-term and stable monitoring, and will also increase the cost of measurement.

Contents of the invention

The purpose of the utility model is to provide a hand-held electrocardiogram detector aiming at the deficiencies of the prior art. The ECG detector uses hand contact electrodes as a method of ECG collection to replace the common chest leads or limb leads, which greatly facilitates the measurement of ECG. At the same time, the detector adopts a high-speed microprocessor with an internal hardware multiplier, which can quickly complete the digital signal processing algorithm, and realize the functions of real-time display, analysis, detection and judgment of common arrhythmias.

In order to achieve the above object, the utility model adopts the following technical solutions:

The hand-held ECG detector includes a housing, on which there is a liquid crystal display, a switch button, a start measurement button, a stop measurement button, a data upload button, a USB interface, and a left hand ECG electrode and a right hand ECG electrode are arranged on the side of the housing electrode. The housing is provided with a microprocessor, a FLASH memory and a function key circuit which are signally connected to the microprocessor. The differential amplifier circuit, the band-pass filter circuit, the in-phase amplifier circuit and the A/D conversion circuit are serially connected in series, wherein the signal output terminal of the A/D conversion circuit is connected to the microprocessor, and the differential amplifier circuit is connected to the left-hand ECG electrode and the right-hand ECG electrode respectively. Electrode connection. The liquid crystal display screen and the USB interface are respectively connected with the microprocessor. The switch button, the start measurement button, the stop measurement button and the data upload button are respectively connected with the function button circuit.

The microprocessor in the utility model adopts a high-speed microprocessor with an internal hardware multiplier, which is a mature technology and can be obtained by purchasing, such as TMS320F2802. The function button circuit, differential amplifier circuit, band-pass filter circuit, in-phase amplifier circuit, A/D conversion circuit and FLASH memory in the utility model all adopt mature technologies. The invention of the utility model is to combine the above components to provide a hand-held and portable ECG detector.

The utility model collects electrocardiographic signals by means of hand contact electrodes. Because the acquisition of ECG must have at least two electrodes contacting two different parts of the human body surface to form a differential input, and then it can be realized after a series of amplification circuits and filter circuits. For example, when an electrode has been Behind the left hand of the human body, the other electrode should be placed on the right hand. For convenience, a two-electrode scheme is often used, and sometimes three or more electrode schemes are used to form a feedback loop in order to improve the anti-interference ability. In the utility model, the differential input is formed by hand contacting the electrodes, that is, the electrocardiographic signals are obtained by touching two or more electrocardiographic electrodes on the detector with the skin of the hand.

The ECG signal extracted by the ECG electrode is amplified by the differential amplifier circuit, and then the high-frequency interference and low-frequency baseline drift are removed by the band-pass filter circuit, and then sent to the final non-inverting amplifier circuit to be amplified within the range of 3V, and finally passed through the A/D The conversion circuit feeds into the microprocessor. The microprocessor displays the ECG waveform on the LCD screen in real time through the software solidified in it, and at the same time completes the analysis, detection and judgment of common arrhythmias on the ECG signal, and finally the detector will collect the data and the detection results It is stored in FLASH memory for easy retrieval and viewing in the future.

Compared with the existing electrocardiographic products, the utility model has more convenient measurement methods, is suitable for family and long-term stable monitoring and detection, adopts a high-speed microprocessor with an internal hardware multiplier, has faster calculation speed, and can display, Analyze and judge common arrhythmias, and upload the data to the PC through the USB interface.

Description of drawings

Fig. 1 is the appearance structure schematic diagram of the present utility model;

Fig. 2 is a schematic structural view of the utility model.

Detailed ways

As shown in Figure 1, the hand-held ECG detector includes a housing, which is provided with a liquid crystal screen 1, a switch button 4, a start measurement button 3, a stop measurement button 2, a data upload button 6, and a USB interface 7. A left-hand ECG electrode 8 and a right-hand ECG electrode 5 are arranged on the side.

As shown in FIG. 2 , the microprocessor 14 is connected with the liquid crystal screen 1 , the FLASH memory 13 , the function button circuit 15 , the USB interface 7 , and the A/D conversion circuit 12 . The function button circuit 15 is respectively connected with the switch button 4, the start measurement button 3, the stop measurement button 2 and the data upload button 6, and utilizes the above four buttons to operate the detector. Differential amplifying circuit 9, band-pass filter circuit 10, in-phase amplifying circuit 11 and A/D conversion circuit 12 are sequentially connected in series, wherein the signal output terminal of A/D converting circuit 12 is connected with microprocessor 14, and differential amplifying circuit 9 is connected with left-handed The electrocardiographic electrode 8 is connected with the right hand electrocardiographic electrode 5 . When in use, touch the left-hand ECG electrode 8 and the right-hand ECG electrode 5 with the left hand and right hand respectively to extract the ECG signal. The ECG signal is filtered out by the differential amplifier circuit 9 to remove common-mode interference, and then passed through the band-pass filter circuit 10 to remove high-frequency interference and low-frequency baseline drift, and then sent to the final non-inverting amplifier circuit 11 to amplify the signal to a range of 3V, and finally It is converted into a digital signal by the A/D conversion circuit 12 and read by the microprocessor 14 . The microprocessor 14 controls the liquid crystal screen 1 to display the ECG waveform in real time, and simultaneously completes the analysis and detection of the collected ECG signals in real time. And the result of detection is stored in the FLASH memory 13, which is convenient for retrieval and viewing in the future. The ECG data and results can be stored continuously for a long time in the FLASH memory, which meets the needs of long-term monitoring and detection. At the same time, for the convenience of data management, the user can also upload the stored data to the PC through the USB interface 7 .

The specific usage method of the detector is as follows:

Turn on the switch button 4 to make the detector in working condition. Then the user holds the left-hand ECG electrode 8 with his left hand, and presses the right-hand ECG electrode 5 with his right hand. Of course, he can also hold the ECG electrode 8 with his right hand, and press the ECG electrode 5 with his left hand, so that the ECG signal can be extracted. After pressing the start measurement button 3, the ECG signal detection starts. At this time, the left and right hand postures should be kept unchanged until the measurement ends. After the extracted geocentric electrical signal passes through the differential amplifier circuit, the band-pass filter circuit and the final amplifier circuit in turn, it is digitized by the A/D conversion circuit and sent to the microprocessor. At this time, the LCD screen 1 will display the collected ECG waveform in real time and display the detected heart rate value. When the stop measurement button 2 is pressed, the measurement ends, and the detector automatically displays the result of this detection, and automatically converts the original The data and related results are stored in the FLASH memory, and the user can upload the data to the PC through the data upload button 6 .

Claims (1)

1. A hand-held ECG detector, comprising a housing, characterized in that the housing is provided with a liquid crystal display, a switch button, a start measurement button, a stop measurement button, a data upload button, and a USB interface, and the side of the housing is provided with The left-hand ECG electrode and the right-hand ECG electrode; the housing is provided with a microprocessor, a FLASH memory connected to the microprocessor signal, a function button circuit; a differential amplifier circuit, a band-pass filter circuit, an in-phase amplifier circuit and an A/D conversion circuit Sequential series connection, in which the signal output terminal of the A/D conversion circuit is connected to the microprocessor, and the differential amplifier circuit is respectively connected to the left-hand ECG electrode and the right-hand ECG electrode; the LCD screen and the USB interface are respectively connected to the microprocessor, and the switch button , the start measurement button, the stop measurement button and the data upload button are respectively connected with the function button circuit.

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