CN1615795A - Household real-time analysis of ECG heart sound monitor - Google Patents

Abstract

The invention belongs to the manufacture of a household real-time analyzing electrocardiogram and heart sound monitor. The instrument includes a lead of heart sound signals and a lead of ECG signals in total. The collected electrocardiographic signal and heart sound signal enter the filter circuit, the differential mode amplifier circuit and the non-phase amplifier circuit through the interface with two channels. The signal amplified by the analog amplifier circuit is sent to the single-chip microcomputer for processing, and the processed data is saved in the flash memory card, and the graphics and analysis results are displayed on the LCD screen in real time. The feature of the invention is that the instrument has real-time analysis and display functions. Monitored graphics and analysis results can be displayed on the LCD screen while monitoring.

Description

Household real-time analysis of ECG heart sound monitor

technical field

The invention relates to a preparation method of a household real-time electrocardiogram and heart sound monitor.

Background technique

The dynamic ECG monitor is an instrument that can monitor the human body's ECG signal 24 hours a day. It uses ECG electrodes to collect the human body's ECG signal, records it with a micro-recorder, and uses a playback device to display data graphics and analysis results. It is mainly used in the qualitative and quantitative analysis and diagnosis of arrhythmia and myocardial ischemia, and can also be used in the differential diagnosis of palpitations, chest pain, dyspnea, dizziness, fainting and other vague symptoms, and the evaluation of the efficacy of cardiovascular drugs. The phonocardiogram is to use the heart sound sensor to collect the mechanical signal of the human heart beat, transmit it to the recorder to record, and display and print it on the terminal device. It can record the doctor's auscultation data and display the signal that the doctor is not easy to distinguish, which can effectively make up for the lack of auscultation. Electrocardiogram combined with phonocardiogram can greatly improve the identification and diagnosis of cardiovascular diseases, and provide valuable information for understanding cardiovascular function, choosing treatment, judging pathology and studying the mechanism of certain diseases.

At present, the existing dynamic ECG monitor is mainly divided into three parts, one is the data acquisition part, which is mainly a disposable ECG electrode or a reusable ECG signal collector, and the other is an ECG signal recorder, which mainly uses To record the ECG signals collected by the ECG electrodes and the ECG signal collector without distortion. The third is the map analysis and terminal playback equipment, which mainly includes personal computers, map analysis software and printers. For example, Xi'an Lineport HOLTER 24-hour dynamic electrocardiogram system mainly consists of the above three parts. Domestically produced phonocardiogram machines, such as the TJY-6 fetal heart sound monitor produced by Shanghai Xingyu Electronic Instrument Factory, mostly use the Doppler effect to make probes. The follow-up circuit is complex, power consumption is large, and the volume is large. The above-mentioned electrocardiograph and phonocardiograph are designed for large-scale hospitals. They are generally large in size and power consumption, expensive, and cannot be accepted by ordinary families, and their humanization and configuration of operation are not suitable for families.

Contents of the invention

The purpose of the present invention is to provide a household real-time analysis of electrocardiogram and heart sound comprehensive monitor.

The present invention utilizes the electrocardiogram electrode and the heart sound sensor to collect the heart sound signal and the electrocardiogram signal of the human body, and after filtering, enters the in-phase amplifier to amplify to a value range suitable for A/D conversion, and then the signal is input into the single-chip microcomputer for analysis and processing, and the data after analysis and processing Enter the flash memory card to save, and display the analysis results and graphics on the LCD screen at the same time.

Specifically, the present invention utilizes PVDF film to develop a sensor as an acquisition device for heart sound signals, and an ordinary disposable electrocardiogram electrode as an electrocardiogram signal collector; the heart sound signal and the electrocardiogram signal each occupy a channel; an industrial-grade single-chip microcomputer completely realizes data collection and control; after the ECG signal passes through the impedance conversion circuit, the high frequency is filtered out by the low-pass filter circuit; the heart sound signal is coupled through the DC blocking capacitor; then the ECG and heart sound signal enter the in-phase amplifier circuit to amplify to a range suitable for the use of the single-chip microcomputer; The amplified signal is sent to the single-chip microcomputer for processing; then the data is stored in the flash memory card; and the analysis results and graphics are displayed on the LCD screen according to the patient's operation.

Description of drawings

Fig. 1 is a schematic diagram of a portable home dynamic ECG heart sound monitor.

Fig. 2 is the ECG lead and the heart sound lead of the analog circuit diagram of the portable home dynamic ECG heart sound monitor.

Fig. 3 is the digital processing part of the circuit diagram of the portable home dynamic ECG heart sound monitor.

Detailed ways

Embodiments of the present invention are described as follows in conjunction with the accompanying drawings:

Figure 1 is a schematic diagram of a household real-time analysis of ECG and heart sound monitor. The ECG signal and heart sound signal are sent to the differential amplifier circuit for amplification after low-pass filtering. The differential amplification is divided into one-stage amplification and two-stage discharge. The range of conversion, the data processed by the single-chip microcomputer are sent to the flash memory card and the LCD screen, and the graphics and analysis results are displayed on the LCD in real time. The power supply of the single-chip microcomputer, the flash memory card and the liquid crystal is provided by the battery after being converted by the DC/DC converter. The feature of the invention is that the instrument has real-time analysis and display functions.

Fig. 2 is the analog circuit diagram part of the electrocardiogram and heart sound part of the household real-time analysis electrocardiogram and heart sound monitor. The entire simulation part is divided into two parts, one part is the ECG lead, and the other is the heart sound lead.

The ECG part adopts double-ended signal input. The input ECG signal passes through the C1 and C2 DC blocking capacitive coupling and then a low-pass filter. The two inputs are grounded through R1 and R2, providing a voltage to ground. R1, R2 and C3 form a low-pass filter. Amplifiers U1 and U2 differentially amplify the double-ended input signal. U1, U2, R3, R4, R5, R6 and R7 form a differential mode amplifier, and the amplification factor is controlled by R4, R5 and R6. Here U1, U2, R3, R4, R5, R6 and R7 are highly symmetrical to reduce amplifier distortion. The signal amplified by the differential mode is sent to the lower-stage amplifier, and U3, R8 and R9 form a second-stage differential-mode amplifier, and the amplification factor is controlled by R8. The data after the non-inverting amplifier is coupled through the C4 DC blocking capacitor, and the data is sent to the non-inverting amplifier to amplify the amplitude suitable for A/D conversion. U4, R11/R12 and C5 form a non-inverting amplifier. U1, U2, U3, and U4 are integrated operational amplifiers with a low-voltage 3.3V operating voltage.

The heart sound part adopts single-ended input mode. The human heart sound signal collected by the heart sound sensor is coupled through the DC blocking capacitive coupling C7, and sent to the differential mode amplifier U5 and U6 for amplification, and the amplification factor is controlled by R16, R17, R18 and R19. U7, R21, and R22 form a two-stage differential-mode amplifier, and C10 is a DC-blocking capacitor. The signal coupled by the DC-blocking capacitor is sent to the non-inverting amplifier to amplify the amplitude suitable for A/D conversion. U8, R24 and C11 form a non-inverting amplifier. VDD is the ground voltage, and the amplified signal enters the PF0 port of the microcontroller for A/D conversion. U5, U6, U7 and U8 are integrated operational amplifiers with a working voltage of 3.3V.

Figure 3 is the digital circuit part of the ECG and heart sound part of the household real-time analysis of ECG and heart sound monitor. The ECG and heart sound signals amplified by the analog amplifier circuit are sent to the PF0 and PF1 ports of the single-chip microcomputer for A/D conversion; the single-chip microcomputer PF2, PF3, PF4 and PF5 are respectively connected to the function keys S5, S6, S7 and S8 for manual control The working state of the single-chip machine, including the reset, read and write and alarm of the single-chip microcomputer; AGND and GND are grounded, and the potential is 0V; the ports AVCC, VCC, and PEN supply power to the single-chip microcomputer through a DC/DC converter; the PA ^* of the single-chip microcomputer and the flash memory card respectively The I/O ^* port of the LCD port is connected with the PIN ^* of the LCD port, which is the data line for the single-chip microcomputer to write data to the flash memory card and the LCD panel, PA ^* is PA0, PA1, PA2, PA3, PA4, PA5, PA6 and PA7, I/O ^* for I/O0, I/O1, I/O2, I/O3, I/O4, I/O5, I/O6 and I/O7, PIN ^* for PIN7, PIN8, PIN9, PIN10, PIN11, PIN12, PIN13 Connect with PIN14; the PC4 port of the MCU is connected to the CE port of the flash memory card to control the status of the flash memory card; the RD and WR of the MCU are respectively connected to the RE and WE of the flash memory card to control the reading and writing of the flash memory card; the PD3 port and the DC/DC converter The PD4 port is connected to the R/B port of the flash memory card; the PD5 port is connected to the CLE port of the flash memory card; the PD6 port is connected to the ALE port of the flash memory card; the PD7 port is connected to the WP port of the flash memory card; XTAL3 is connected with the crystal oscillator to provide the clock signal for the microcontroller. The operating voltage of the microcontroller is 3.3V, and the model is ATMEGA128L.

U9 is a liquid crystal panel, USS and VDD are respectively connected to the ground and power supply, the voltage is 3.3V, PIN18 and PIN3 are connected through a resistor R26, and the value of R26 is 0 to 4.7KΩ to adjust the contrast of the LCD panel; the PIN4 port of the LCD panel is connected to the MCU The PD1 port is connected; the PIN5 port is connected to the PE0 port of the single-chip computer; the PIN6 port is connected to the PE1 port of the single-chip computer; the PIN15 and PIN16 ports of the liquid crystal are respectively connected to the PD0 and PE6 ports as chip selection signals; the PIN17 port of the liquid crystal is connected to the PE5 port of the single-chip computer The port is connected to control the reset of the LCD. The operating voltage of the liquid crystal is 3.3V. The LCD model is HS12864-16A.

The invention provides a home electrocardiogram and heart sound monitoring system capable of real-time analysis. Provide one lead ECG data and one set of heart sound data. The present invention is characterized by real-time analysis function, scientific and humanized design, and is suitable for ordinary families. In addition, it also has the characteristics of good reliability, large data storage capacity, low power consumption, small size, portable and low price.

Claims (6)

1, a kind of domestic real-time analysis electrocardio hear sounds monitor, utilize electrocardioelectrode and heart sound transducer to gather the cardiechema signals and the electrocardiosignal of human body, go into in-phase amplifier and be amplified to the codomain scope that is fit to the A/D conversion through filtering is laggard, signal is imported the single-chip microcomputer analyzing and processing then, data after the analyzing and processing enter flash card and preserve, simultaneously display analysis result and figure on LCD Panel.

2, monitor as claimed in claim 1 is characterized in that, described heart sound signal collector is a piezoelectric film sensor; Described ecg signal acquiring device is common disposable electrocardioelectrode.

3, monitor as claimed in claim 1 or 2 is characterized in that, described electrocardio partly adopts the double-end signal input, and hear sounds partly adopts single-ended input pattern.

4, monitor as claimed in claim 1 is characterized in that, electrocardiosignal filters high frequency by after the impedance inverter circuit by low-pass filter circuit; Cardiechema signals then is coupled by capacitance; Electrocardio and cardiechema signals enter the in-phase amplification circuit amplification and enter single-chip microcomputer then.

5, monitor as claimed in claim 1 is characterized in that, described one-chip machine port is: PA0, PA1, PA2, PA3, PA4, PA5, PA6 and PA7; The port of described flash card is: I/O0, I/O1, I/O2, I/O3, I/O4, I/O5, I/O6 and I/O7; Described LCDs port is: PIN7, PIN8, PIN9, PIN10, PIN11, PIN12, PIN13 and PIN14.

6, monitor as claimed in claim 1 is characterized in that, described single-chip microcomputer is the single-chip microcomputer of technical grade.

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