The heart is the driving force for the metabolism and energy transfer of organisms, and its importance to the human body is self-evident. Almost all heart diseases are associated with the bioelectrical activity of the heart. In the current society, cardiovascular diseases such as heart disease have become the world's most deadly, known as the "number one killer." Because heart disease is sudden and long-lasting, it also requires long-term treatment and monitoring for heart patients. It can help to understand the effects of certain drugs and electrolyte disorders on the myocardium. There is a great demand for electrocardiographs. Holter. Major companies have introduced different product solutions, and their competitive points focus on weak signal detection accuracy, cost, reliability and functional expansion. The main features of ECG are:
1. The signal is very weak and the amplitude is less than 5mV.
2. The common ECG frequency is generally between 0-100 Hz, and the energy is mainly concentrated around 17 Hz.
3. The impedance of the ECG electrode is large when measuring, generally several hundred kilo ohms or more.
4, extremely susceptible to power frequency interference.
This design utilizes the high integration of PIC microprocessor, USB interface and network interface design to realize the home holter monitor. Compared with the current commercial holter instrument, it has the characteristics of not transmitting data to the hospital, and conforms to the technical development of information design. .
Two ECG analog processing moduleDue to the characteristics of the ECG signal, some work must be done by analog hardware. The research team has completed the basic hardware design. The block diagram is as follows:
This design is based on the advantages of PIC32 devices to achieve a 3-lead ECG holter monitor with ECG signal sensing and selection, input coupling, impedance matching, preamplification, filtering, ADC conversion and detection algorithms, USB mass storage, network Transfer and other functions. The main block diagram is as follows:
PIC32's USB and network interface applications have a certain demo in the development environment, I believe that with the help of these DEMO will be able to achieve the design features.
Its USB DEMO is as follows
The WINDOWS driver includes INF and SYS. The INF is placed in windows/inf and the SYS is placed in WINDOW/SYSTEM32/DRIVER. Windows uses the inf file instead of manually installing the SYS file. Some USB devices do not need to install drivers such as HID class, but MCHPFSUSB-based devices need to be installed. The environment provides INF files, just modify VID/PID. Microchip's VID (0x04d8), modify the VID/PID first in the usb_descriptors.c file and then modify it in the "[DeviceList] section of the INF file.
The DEMO of its network interface is as follows
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