WO2018126498A1

WO2018126498A1 - Leadless standard electrocardiograph

Info

Publication number: WO2018126498A1
Application number: PCT/CN2017/071585
Authority: WO
Inventors: 王克镇; 韦晓东; 杜文军
Original assignee: 江苏鹿得医疗电子股份有限公司
Priority date: 2017-01-03
Filing date: 2017-01-18
Publication date: 2018-07-12

Abstract

A leadless standard electrocardiograph. The invention is characterized in that the electrocardiograph comprises a main machine electrode, a standard electrode, and a display device. A wireless transmission method is used for transmission between the main machine electrode and the standard electrode, and between the main machine electrode and the display device. The main electrode communicates, via the wireless transmission method, with one or a plurality of the standard electrodes. The electrocardiograph transmits, using a wireless method, a signal detected by the electrode to the main machine. The main machine then transmits, using the wireless method, to the display device. The entire process does not require lead wires, ensuring excellent user experience. The invention can also be used to assemble various standard leads to test a standard electrocardiogram and achieve a diagnostic result with a quality similar to a result obtained by a conventional standard lead.

Description

Leadless line standard ECG monitor

Technical field

The invention relates to a monitor, in particular to a lead-free standard ECG monitor, belonging to the technical field of medical device equipment.

Background technique

The monitor generally monitors ECG, respiration, blood pressure, oxygen saturation, pulse rate, body temperature, end-tidal carbon dioxide, respiratory mechanics, anesthetic gas, cardiac output, and bispectral index. It is not for hospitals and families. One of the missing medical device devices.

The generation of human ECG signals: the tissue and body fluid around the heart can be electrically conductive, so the human body can be regarded as a volume conductor with a length, width and thickness. The heart is like a power source, and the sum of the action potential changes of numerous cardiomyocytes can be transmitted and reflected to the body surface. There are potential differences between many points on the body surface, and there are many points where there is no potential difference between them. During each cardiac cycle, the heart is excited by the pacemaker, the atria, and the ventricle. With the changes in bioelectricity, these changes in bioelectricity are called ECG.

Characteristics of human ECG signals: ECG signals are biomedical signals with the following characteristics:

(1) The signal has the characteristics of near-field detection. When the distance from the human body is small, the signal is basically not detected;

(2) ECG signals are usually weak, up to mV;

(3) is a low frequency signal, and the energy is mainly below a few hundred hertz;

(4) The interference is particularly strong. The interference comes from the living body, such as myoelectric interference, respiratory interference, etc.; it also comes from outside the body, such as power frequency interference, other alien crosstalk introduced by poor grounding during signal picking, etc.;

(5) The interference signal overlaps with the frequency band of the ECG signal itself (such as power frequency interference, etc.).

ECG signal research: ECG signal is one of the earliest biological signals that humans have studied and applied in medical clinic. It is easier to detect than other bioelectric signals, and has more intuitive regularity. Therefore, ECG analysis technology promotes medical development of. Electrocardiography is an important method for clinical diagnosis of cardiovascular disease. The accurate and automatic analysis and diagnosis of electrocardiogram plays a key role in cardiovascular disease, and it is also a topic of interest for scholars at home and abroad.

The significance of the detection of ECG signals: for the examination of various arrhythmia, ventricular atrial hypertrophy, myocardial infarction, arrhythmia, myocardial ischemia and other diseases. The electrocardiogram is an electrical activity process that reflects the heart's excitement. It has important reference value for the basic function of the heart and its pathological research. The examination of the electrocardiogram must be combined with a variety of indicators and clinical data to conduct a comprehensive and comprehensive analysis in order to make a correct judgment of the functional structure of the heart.

The basic composition of ECG signals: ECG signals consist of P, QRS, T waves and resting periods. As shown in Figure 1, each wave has different frequency characteristics. It is a typical time-frequency special feature and time-scale feature. Biomedical signal.

The P.QRS.T wave and the PR, ST, and QT intervals all reflect the changes in cardiac function to varying degrees. Therefore, the automatic analysis and identification of cardiac function by algorithm has become a hot research direction.

Extraction of ECG signals: Biomedical signals are low-frequency weak signals in the background of strong noise, which are unstable natural signals emitted by complex living bodies. Various physiological parameters such as ECG, EEG, EMG, etc., non-electrical signals such as temperature, pressure flow, force, displacement, etc. of body temperature, blood pressure, respiration, blood flow, pulse, heart sound, etc., from the characteristics of the signal itself to the extraction method It is different from the situation in industrial engineering and has its particularity. As a signal source The human body is an extremely complex life system for the extraction and processing of human biomedical signals, which is more important in the natural sciences. The bioelectrical phenomenon of the human body is picked up by the electrode by a certain lead method, and each non-electrical parameter is converted into an electrical signal by various sensors and then picked up. The electrode forms include a skin surface electrode body surface electrode, a needle electrode, a micro electrode, and the like. The shape of the surface electrode is a metal plate electrode for a limb, a metal disk electrode glued with an adhesive plaster, a cup electrode, a floating surface electrode, Snap-on electrodes and special-type surface electrode ear clip electrodes. The so-called polarization of the electrode means that the electrode forms an electric double layer at the interface with the electrolyte solution and a polarization voltage is generated when the electrode and the electrolyte solution interface potential change when a current flows. The primary signal is obtained by removing the interference of the original signal by the signal processing circuit, and then performing various signals to obtain a secondary signal capable of reflecting the function of the organ. The bioelectrically guided electrode actually performs the interface between the human body and the measurement system. In order to introduce a bioelectrical signal into the signal processing module, the guiding electrode must have the ability to conduct current. In the human body, the current is ionically conductive and electronically conductive within the test system. The electrode is actually turned into a transducer by the guiding electrode to change the ion current into electronic electricity.

At present, the market is divided into two types of products: two-electrode type and multi-electrode standard lead type. The two-electrode type calculates the electrocardiogram by detecting the voltage difference between the two points of the body. The distance between the two electrodes is short, it can be used without wires, and it is convenient to wear. The convenience is good, but the electrocardiogram of the standard lead is not obtained. The reference value is low. The electrocardiogram obtained by the multi-electrode standard lead type can be matched with the standard library, and has a high diagnostic reference value. However, each electrode is drawn through the wire, which is troublesome to wear and has a poor experience. Therefore, there is an urgent need for a new one. The technical solution solves this problem.

Summary of the invention

The present invention is directed to the technical problems existing in the prior art, and provides a lead-free standard ECG monitor, which transmits the signal detected by the electrode to the host wirelessly, without a lead wire standard ECG. The monitor, the signal of the electrode detection is transmitted to the host in a wireless manner, and the host is also transmitted to the display device in a wireless manner, and the whole process does not need a wire, which ensures a good experience and can form various standard leads and test. A standard ECG is obtained, which gives the same diagnostic results as a conventional standard lead.

In order to achieve the above object, the technical solution of the present invention is as follows, a leadless standard ECG monitor, characterized in that the ECG monitor comprises a host electrode, a common electrode and a display device, the host electrode and the common The electrodes are transferred between the electrodes and the display device by wireless transmission, and the host electrodes are connected to one or more common electrodes by wireless transmission.

As an improvement of the present invention, the wireless transmission mode adopts one of the following modes, a high frequency radio, an infrared light wave, an acoustic wave, (audio, ultrasonic, etc.); wherein the high frequency radio includes Bluetooth, wife, 2.4 GHz, 868 mhz , 433mhz, 315mhz and other radio protocols, standards, frequencies, the sound waves include audio, ultrasonic waves, the common electrode includes an electrode sheet, a preamplifier circuit, a high pass filter circuit, a main amplifier circuit, a low pass filter circuit, and a wireless transmit circuit The electrode sheet is connected to the high-pass filter circuit through a preamplifier circuit, and the high-pass filter circuit is connected to the low-pass filter circuit and the wireless transmission circuit through the main amplifier circuit.

As an improvement of the present invention, the host electrode includes an RL electrode, an RL electrode, an electrode, a gain control circuit, an MCU, a Bluetooth circuit, and a wireless receiving circuit, and the RL battery The pole piece is attached to the surface of the human body, and the wireless receiving circuit is connected to the electrode through a gain control circuit, and the electrode transmits the signal to the display device through the MCU and the Bluetooth circuit.

As an improvement of the present invention, the common electrode power supply circuit includes a resistor R1, a resistor R2, a switch S1, an operational amplifier U1A capacitor C11, and a capacitor C1, wherein the capacitor C1, the resistor R1, the resistor R2, and the capacitor C11 form a peripheral circuit, and the battery The power supply is supplied to each circuit through the switch S1 and the peripheral circuit and the operational amplifier U1A form a virtual ground. One-half VDD voltage (Vref) is virtually supplied to each operational amplifier circuit.

As an improvement of the present invention, the electrode sheet and the preamplifier circuit include a resistor R5, a capacitor C12, and an operational amplifier U1B, wherein the operational amplifier U1B constitutes a voltage follower, and the signal detected by the electrode sheet is sent through RC passive filtering. The U1B voltage follower performs impedance transformation to amplify the drive capability. Because the ECG signal is too weak.

As a modification of the present invention, the high-pass filter amplifying circuit includes a resistor R8, a resistor R9, a resistor R10, a resistor R13, a capacitor C6, a capacitor C7, and an operational amplifier U1C, wherein the resistor R8, the resistor R9, the resistor R10, the resistor R13, The capacitor C6 and the capacitor C7 form a peripheral component, and the operational amplifier U1C and the peripheral components constitute a second-order active high-pass filter circuit to filter out the interference signal of the low-frequency portion.

As a modification of the present invention, the main amplifying circuit comprises a resistor R4, a resistor R7, and an operational amplifier U1D, wherein the resistor R4, the resistor R7, and the operational amplifier U1D constitute an inverse amplifying circuit, and the amplification factor is R7/R4.

As an improvement of the present invention, the low-pass filter amplifying circuit includes a resistor R12, a resistor R6, a resistor R14, a resistor R11, a capacitor C4, a capacitor C5, and an operational amplifier U2B, wherein the resistor R12, the resistor R6, the resistor R14, and the resistor R11 , capacitor C4 and capacitor C5 The peripheral components are composed, and the operational amplifier U2B and the peripheral components constitute a second-order active low-pass filter circuit to filter out the interference signal of the high-frequency portion.

As an improvement of the present invention, the wireless transmitting circuit includes a resistor R3, an operational amplifier U2C, a capacitor C3, a resistor R5, a surface acoustic filter Y1, a transistor Q1, a crystal oscillator L1, a capacitor C9, a capacitor C8, a capacitor C10, and a resistor. R16, the operational amplifier U2C forms a voltage follower, the capacitor C3, the resistor R5, the surface acoustic filter Y1, the transistor Q1, the crystal oscillation L1, the capacitor C9, the capacitor C8, the capacitor C10 and the resistor R16 form a capacitor three-point high-frequency wireless transmitting circuit The signal first passes through the voltage follower formed by U2C to perform impedance transformation to improve the driving capability, and then sends it to the capacitor three-point high-frequency wireless transmitting circuit to transmit the signal. The acoustic surface filter Y is used to make the frequency relatively stable and it is not easy to drift. Each common electrode is distinguished by a different transmission frequency, and the principle of the entire circuit is completely identical. Different common electrodes only need to be replaced with different surface acoustic surface filters and adjustment matching components in the transmitting circuit portion.

As a modification of the present invention, the gain control circuit includes a resistor R17, a resistor R18, the operational amplifier U5C, a resistor R19, a resistor R20, a capacitor C13, a capacitor C17, and a transistor Q2. The resistor R17, the resistor R18, and the resistor R19, resistor R20, capacitor C13, capacitor C17 and transistor Q2 form a peripheral circuit, wherein operational amplifier U5C and peripheral circuits constitute a gain control circuit. The received signal is input to the operational amplifier U5C. The high-frequency clutter is considered to make the signal cleaner. The MUC output AGC signal controls the gain to compensate for the amplitude offset generated by the signal processed by the previous circuits and is adjusted to be suitable for simulation. The signal of the front end chip.

As an improvement of the present invention, the power circuit of the host electrode is adopted The TPS61220DCK chip, the wireless receiving circuit uses a MICRF007 chip.

Compared with the prior art, the present invention has the following advantages: 1) the technical solution is ingeniously designed and compact; 2) the signal detected by the electrode in the technical solution is transmitted to the host in a wireless manner, and the host is retransmitted in a wireless manner. For the display device, there is no need for wires throughout the whole process, which ensures a good experience, and can also form various standard leads, measure the standard electrocardiogram, and obtain the same diagnostic effect as the conventional standard lead. In the RL position, the rest of the host electrode is a common electrode, and each common electrode detects each ECG signal and then transmits it to the host electrode in a wireless manner; the host electrode detects the RL signal, and receives the signal from the common electrode and sends it to the ECG chip. Analysis, and finally transmitted to the display device by wireless Bluetooth, to improve the experience while ensuring the measurement effect; 3) The technical solution truly realizes the wireless transmission, the signal detected by the electrode piece is transmitted to the host through the wireless mode, and the host passes the wireless The mode is transmitted to the display device, and the operation is convenient.

DRAWINGS

Figure 1 is a waveform diagram of a typical ECG signal;

Figure 2 is a schematic view showing the overall composition of the present invention;

3 is a schematic view of a common electrode;

4 is a schematic diagram of a host electrode;

5 is a schematic diagram of a common electrode power supply circuit;

Figure 6 is a schematic view of an electrode pad and a preamplifier circuit;

Figure 7 is a high pass filter amplifying circuit;

Figure 8 is a schematic diagram of a main amplifying circuit;

9 is a schematic diagram of a low pass filter amplifying circuit;

10 is a schematic diagram of a wireless transmission circuit;

11 is a schematic diagram of a wireless receiving circuit;

Figure 12 is a schematic diagram of a gain control circuit;

Figure 13 is a circuit diagram of the host electrode power supply;

Figure 14 is a front view and peripheral circuit diagram of the electrocardiogram simulation;

Figure 15 is a schematic diagram showing the connection between the internal structure of the ADS1293 and an external pin;

Figure 16 is a schematic view showing the position of the host motor when in use;

Figure 17 is a schematic diagram of a display device.

detailed description

In order to deepen the understanding of the present invention, the present embodiment will be described in detail below with reference to the accompanying drawings.

Embodiment 1: Referring to FIG. 2, a leadless standard ECG monitor includes a host electrode, a common electrode, and a display device, and between the host electrode and the common electrode and the host electrode and the display The devices transmit by wireless transmission, and the host electrodes are connected to one or more common electrodes by wireless transmission; the wireless transmission mode adopts one of the following modes, high frequency radio, infrared light wave, sound wave, (audio , high-frequency radio, etc.; wherein the high-frequency radio includes Bluetooth, wife, 2.4ghz, 868mhz, 433mhz, 315mhz, and other radio protocols, standards, frequencies, the sound waves include audio, ultrasonic waves, see FIG. 3, the common electrode includes an electrode sheet a preamplifier circuit, a high pass filter circuit, a main amplifying circuit, a low pass filter circuit and a wireless transmitting circuit, wherein the electrode sheet is connected to the high pass filter circuit through a preamplifier circuit, and the high pass filter circuit is connected to the low pass filter circuit through the main amplifier circuit and Wireless transmission circuit.

Referring to FIG. 4, the host electrode includes an RL electrode, a plurality of wireless receiving circuits, Gain control circuit, ECG signal analog front end circuit, MCU+Bluetooth circuit, the RL electrode piece is attached to the surface of the human body, the wireless receiving circuit is connected to the electrode through the gain control circuit, and the ECG signal analog front end circuit is connected to the MCU and the Bluetooth circuit to transmit the signal to display screen.

Referring to FIG. 5, the common electrode power supply circuit includes a resistor R1, a resistor R2, a switch S1, an operational amplifier U1A capacitor C11, and a capacitor C1. The capacitor C1, the resistor R1, the resistor R2, and the capacitor C11 form a peripheral circuit, and the battery passes through the switch S1. The filtering supplies power to the circuits, and the peripheral circuit and the operational amplifier U1A form a virtual ground. One-half VDD voltage (Vref) is virtually supplied to each operational amplifier circuit.

Referring to FIG. 6, the electrode pad and the preamplifier circuit include a resistor R5, a capacitor C12, and an operational amplifier U1B. The operational amplifier U1B constitutes a voltage follower, and the signal detected by the electrode chip is sent to the U1B voltage follower through RC passive filtering. Perform impedance transformation to amplify the drive capability. Because the ECG signal is too weak.

Referring to FIG. 7, the high-pass filter amplifying circuit includes a resistor R8, a resistor R9, a resistor R10, a resistor R13, a capacitor C6, a capacitor C7, and an operational amplifier U1C, wherein the resistor R8, the resistor R9, the resistor R10, the resistor R13, the capacitor C6, and the capacitor C7 forms a peripheral component, and the operational amplifier U1C and peripheral components constitute a second-order active high-pass filter circuit that filters out the interference signal of the low-frequency portion.

Referring to FIG. 8, the main amplifying circuit comprises a resistor R4, a resistor R7, and an operational amplifier U1D, wherein the resistor R4, the resistor R7, and the operational amplifier U1D constitute an inverse amplifying circuit, and the amplification factor is R7/R4.

Referring to FIG. 9, the low-pass filter amplifying circuit includes a resistor R12, a resistor R6, a resistor R14, a resistor R11, a capacitor C4, a capacitor C5, and an operational amplifier U2B, wherein the resistor R12, The resistor R6, the resistor R14, the resistor R11, the capacitor C4, and the capacitor C5 constitute a peripheral component, and the operational amplifier U2B and the peripheral component constitute a second-order active low-pass filter circuit to filter out the interference signal of the high-frequency portion.

Referring to FIG. 10, the wireless transmitting circuit includes a resistor R3, an operational amplifier U2C, a capacitor C3, a resistor R5, a surface acoustic filter Y1, a transistor Q1, a crystal oscillator L1, a capacitor C9, a capacitor C8, a capacitor C10, and a resistor R16. The operational amplifier U2C forms a voltage follower. The capacitor C3, the resistor R5, the surface acoustic filter Y1, the transistor Q1, the crystal oscillation L1, the capacitor C9, the capacitor C8, the capacitor C10 and the resistor R16 form a three-point high-frequency wireless transmitting circuit of the capacitor, and the signal passes first. The voltage follower formed by U2C performs impedance transformation to enhance the driving capability, and then sends it to the capacitor three-point high-frequency wireless transmitting circuit to transmit the signal. The acoustic surface filter Y is used to make the frequency relatively stable and it is not easy to drift. Each common electrode is distinguished by a different transmission frequency, and the principle of the entire circuit is completely identical. Different common electrodes only need to be replaced with different surface acoustic surface filters and adjustment matching components in the transmitting circuit portion.

Referring to Figure 13, the host electrode power supply circuit diagram uses TI (Texas Instruments) DCDC boost regulator IC, model: TPS61220DCK, to provide power supply for each circuit. The TPS61220 is a 5.5mA quiescent current low input voltage, 0.7V boost converter. The TPS61220 is available in a 6-pin SC-70 package that maintains high efficiency under low load conditions. The battery life of the system based on the design of a low power microprocessor can be further extended. At 5V output voltage, the output current is as high as 50mA, and the system's lithium-ion battery discharge voltage is lower than 2.5V.

The wireless receiving circuit portion of each electrode is as shown in Fig. 11, and the circuit is centered on MICRF007. MICRF007 is a single-chip UHF ASK/OOK (on-off keying) superheterodyne radio receiver chip from Micrel. MICRF007 is packaged in SOP(M)-8. The on-chip circuit can be divided into UHF down converter, OOK demodulator and reference control. The UHF down converter includes an RF amplifier, a mixer, an intermediate frequency amplifier, a band pass filter, a peak detector, a synthesizer, and an AGC control circuit; the OOK demodulator includes a low pass filter and a comparator; and the reference control circuit includes a reference oscillation. And control logic circuit, only need to connect two capacitors CAGC and CTH, one crystal oscillator and power supply decoupling capacitor can form a UHF ASK receiver, all RF and IF tuning are done automatically in the chip, is a real Monolithic device for "wireless input - data output". The receiving circuit of each electrode only needs to change the receiving frequency by changing different crystal oscillators, and it can be corresponding to each transmitting electrode, and the used chip and circuit principle are completely identical. Referring to FIG. 12, the gain control circuit includes a resistor R17, a resistor R18, the operational amplifier U5C, a resistor R19, a resistor R20, a capacitor C13, a capacitor C17, and a transistor Q2. The resistor R17, the resistor R18, the resistor R19, and the resistor R20 The capacitor C13, the capacitor C17 and the transistor Q2 form a peripheral circuit, wherein the operational amplifier U5C and the peripheral circuit constitute a gain control circuit. The received signal is input to the operational amplifier U5C. The high-frequency clutter is considered to make the signal cleaner. The MUC output AGC signal controls the gain to compensate for the amplitude offset generated by the signal processed by the previous circuits and is adjusted to be suitable for simulation. The signal of the front end chip.

See Figure 14 ECG analog front end and peripheral circuit diagram, using the professional ECG analog front end of TI's ADS129X series, ADS1291--ADS1298 is mainly different in the number of electrodes, using different chips according to requirements. The ADS1293 chip design is now introduced. ADS1293 is a 3-channel, 24-bit device used by Texas Instruments (TI) for biopotential measurement. Integrated analog front end, each channel can be set for a specific sample rate and bandwidth, enabling users to optimize configuration for performance and power consumption, with AC/DC disconnection detection (Lead_offDetect), battery power monitoring and self-diagnostics Features such as alarms, built-in the right leg drive circuit required for ECG applications to rent Wilson/Goldberger terminals. The internal structure of the ADS1293 is connected to external pins as shown in Figure 15. The flow direction of the signal can be divided into signal input interface, signal processing unit and signal output interface.

(1) Signal input interface. There are 6 signal input pins from IN1 to IN6. All input pins contain an electromagnetic interference (EMI) filter to filter out RF noise. The system uses a 5-lead connection, ie the right arm (RA), the left arm (LA) and the left leg (LL) are connected to the IN1, IN2 and IN3 pins respectively; the common mode detector (CMdetect) takes RA, LA and LL The average voltage is used as the input to the right leg drive (RLD) amplifier, and the output of the right leg drive amplifier is returned to the right leg (RL) terminal, which is input together from the IN4 pin. The function of the right leg drive circuit is to control the patient's common mode level and increase the AC rejection ratio of the system; the output of the Wilson Network (WCT) is connected to the IN6 pin and is used as the CH3 channel together with the V1 (thoracic electrode) connected to the IN5 pin. Differential signal input.

(2) Signal processing unit. It is mainly composed of three parts: instrument amplifier (INA), ∑Δ regulator (SDM) and low-pass digital filter (DigitalFilter). Its main function is to convert differential analog voltage signals into digital signals. The instrumentation amplifier is an operational amplifier circuit with high input impedance. It has two main functions: 1) Amplifying the differential signal. 2) Provide high input impedance to obtain a larger input signal from the ECG electrode. The output signal of the instrument amplifier is sent to the ∑Δ modulator for analog-to-digital conversion. The ∑Δ modulator is a one-bit coding technique based on oversampling, and the output reflects a one-bit coded data stream of the input signal amplitude. Low The pass digital filter consists of three programmable 5th-order sin-type filters. The output of the ∑Δ modulator is processed by a low-pass digital filter to obtain an N-bit coded output.

(3) Signal output interface. It mainly includes 4-wire SPI serial interface, DRDYB pin and ALRAM pin. The functions of each pin are as follows: SCLK is the serial clock input pin; SDI is the serial data input pin, a total of 16 bits, of which 1 bit read and write control, 7 bit address and 8 bit data. During the rising edge of the clock, all data is sampled and written to the register on the 16th rising edge of the clock. SDO is a serial data output pin that reads data on the SDO pin on the falling edge of 8 to 15 clocks. CSB is a chip select pin, active low. The SPI interface starts reading and writing data during low level, and the low level is maintained for 16 clock cycles. DRDYB is the analog to digital conversion end pin, indicating that the internal data of the chip is ready. Readable, active low, usually used as interrupt signal or status inquiry signal of CPU; ALARMB is alarm pin, ADS1293 has a self-diagnosis alarm system for diagnosing abnormal conditions that may occur in ECG applications. Abnormal conditions mainly include electrode dropout, synchronization error, low-power warning and three-channel operation abnormality. When an abnormal situation occurs, the error flag is reported and displayed on the ARLAM pin.

The MCU and the Bluetooth transmitting circuit transmit the signal collected by the ECG signal to the front end circuit and transmit the signal to the terminal device through the circuit. The circuit is based on TI's CC2541. The CC2541 combines the performance of leading RF transceivers with an industry-standard enhanced 8051MCU, in-system programmable flash memory, 8KB RAM and many other powerful features and peripherals; the CC2541 is ideal for ultra-low power consumption The system, which is specified by a number of different operating modes. Short transition time between operating modes One step is to reduce energy consumption. The CC2541 embeds the 8051 core, and the encoded digital signal of the ECG transmission module is received by the SPI protocol, processed, and then transmitted through the RF.

working principle:

Referring to Figures 16 and 17, in use, the display device (mobile phone, computer, etc.) is pre-installed with the corresponding APP (application), the product is accompanied by the APP CD or downloaded to the company website; electrodes are attached to the corresponding positions according to the requirements and standards. The film, the corresponding common electrode and the host electrode are buckled onto the electrode piece to ensure good contact, and each electrode switch is turned on, the host electrode is matched with the display device, the connection is established, the display device is operated, the electrocardiogram is displayed, and the electrocardiogram is monitored without any Leads, perfect inspection experience, and finally get a standard ECG.

It is to be noted that the above-described embodiments are not intended to limit the scope of the present invention, and equivalent changes or substitutions made on the basis of the above technical solutions fall within the scope of the claims of the present invention.

Claims

A lead-free standard ECG monitor, characterized in that the ECG monitor comprises a host electrode, a common electrode and a display device, and the host electrode and the common electrode pass between the host electrode and the display device The wireless transmission mode is transmitted, and the host electrode is connected to one or more common electrodes by wireless transmission.
The lead-free standard ECG monitor according to claim 1, wherein the wireless transmission mode adopts one of the following modes: high-frequency radio, infrared light wave, sound wave, (audio, ultrasonic, etc.); The high frequency radio includes Bluetooth, wife, 2.4ghz, 868mhz, 433mhz, 315mhz and other radio protocols, standards, frequencies, the sound waves include audio, ultrasonic waves, the common electrode includes an electrode sheet, a preamplifier circuit, a high pass filter circuit The main amplifying circuit, the low-pass filter circuit and the wireless transmitting circuit, the electrode sheet is connected to the high-pass filter circuit through the preamplifier circuit, and the high-pass filter circuit is connected to the low-pass filter circuit and the wireless transmitting circuit through the main amplifying circuit.
The lead-free standard ECG monitor according to claim 2, wherein the host electrode comprises an RL electrode, a plurality of wireless receiving circuits, a gain control circuit, an electrocardiogram analog front end circuit, and an MCU+Bluetooth circuit. The RL electrode piece is attached to the surface of the human body, and the wireless receiving circuit is connected to the ECG signal analog front end circuit through the gain control circuit, and the ECG signal analog front end circuit transmits the signal to the display device through the MCU and the Bluetooth circuit.
The lead-free standard ECG monitor according to claim 2 or 3, wherein the common electrode power supply circuit comprises a battery BT1, a resistor R1, a resistor R2, a switch S1, an operational amplifier U1A capacitor C11, and a capacitor C. The operational amplifier U1A and the peripheral component capacitor C1, the resistor R1, the resistor R2 and the capacitor C11 form a virtual ground circuit, and the battery After the switch S1, the power supply is supplied to each circuit, and the virtual ground circuit generates a virtual ground signal as a reference level of each operational amplifier circuit.
The lead-free standard ECG monitor according to claim 4, wherein the electrode pad and the preamplifier circuit comprise a resistor R5, a capacitor C12, and an operational amplifier U1B, wherein the operational amplifier U1B constitutes a voltage follower. The signal detected by the electrode chip is sent to the U1B voltage follower through the RC passive filter for impedance transformation to amplify the driving capability.
The lead-free standard ECG monitor according to claim 5, wherein the high-pass filter amplifying circuit comprises a resistor R8, a resistor R9, a resistor R10, a resistor R13, a capacitor C6, a capacitor C7, and an operational amplifier U1C. The resistor R8, the resistor R9, the resistor R10, the resistor R13, the capacitor C6, and the capacitor C7 are peripheral components, and the operational amplifier U1C and the peripheral components form a second-order active high-pass filter circuit to filter out the interference signal of the low frequency portion.
The lead-free standard ECG monitor according to claim 6, wherein the main amplifying circuit comprises a resistor R4, a resistor R7, and an operational amplifier U1D, wherein the resistor R4, the resistor R7, and the operational amplifier U1D are formed. Inverting the amplifier circuit, the magnification is R7/R4.
The lead-free standard ECG monitor according to claim 7, wherein the low-pass filter amplifying circuit comprises a resistor R12, a resistor R6, a resistor R14, a resistor R11, a capacitor C4, a capacitor C5, and an operational amplifier U2B. The resistor R12, the resistor R6, the resistor R14, the resistor R11, the capacitor C4 and the capacitor C5 constitute a peripheral component, and the operational amplifier U2B and the peripheral component form a second-order active low-pass filter circuit to filter out the interference signal of the high-frequency portion.
The leadless standard ECG monitor according to claim 8, wherein The wireless transmitting circuit includes a resistor R3, an operational amplifier U2C, a capacitor C3, a resistor R5, a surface acoustic filter Y1, a transistor Q1, a crystal oscillator L1, a capacitor C9, a capacitor C8, a capacitor C10, and a resistor R16. The operational amplifier U2C is formed. Voltage follower, capacitor C3, resistor R5, surface acoustic filter Y1, transistor Q1, crystal oscillation L1, capacitor C9, capacitor C8, capacitor C10 and resistor R16 form a capacitor three-point high-frequency wireless transmission circuit, the signal first through the U2C voltage The follower performs impedance transformation to improve the driving capability, and then sends it to the capacitor three-point high-frequency wireless transmitting circuit to transmit the signal.
The lead-free standard ECG monitor according to claim 9, wherein the gain control circuit comprises a resistor R17, a resistor R18, the operational amplifier U5C, a resistor R19, a resistor R20, a capacitor C13, and a capacitor C17. And the transistor Q2, the resistor R17, the resistor R18, the resistor R19, the resistor R20, the capacitor C13, the capacitor C17 and the transistor Q2 constitute a peripheral circuit, wherein the operational amplifier U5C and the peripheral circuit constitute a gain control circuit.