Non invasive sensing and analysis of cardiac electric potential — ‘system study, simulation and implementation’

This paper proposes a new technique for noninvasive measurement and analysis of cardiac electric signals. Using this technique it is possible to sense and measure the cardiac electrical signals from the human body at up to 50 cm. The sensor used in this system is an electrode and it is followed by an ultra low bias current instrumentation amplifier. This combination enhances input impedance by considerable margin. This method makes it possible to sense and measure heart signals non invasively. Unlike other noninvasive techniques, this system is capable of sensing the very weak electric potential radiated from the body directly with out any type of transmitter and receiver unit. Cardiac electric signals absorbed by the sensor is further conditioned and then digitized to convert it to RS232 standard. And finally connected to a computer through serial port and displayed using GUI in MATLAB 7.