Design of Electrocardiogram (ECG) System NASSER AL-SOLIMAN HASSAN AL-TAMIMI AMER AL-KTHERE Biomedical Technology Department College of Applied Medical Sciences Salman Bin Abdul-Aziz University

Abstract This research deals with the design of electrocardiogram (ECG) system that measures heart signals. The design is based on discrete electronics components that reduce the cost of the system. The system consists of 3-op-amp instrumentation amplifier, band-pass filter with bandwidth of 0.05Hz - 100Hz, mains frequency notch filter and a total gain of 1000. A stand alone split power supply is designed to power the system. The ECG system is tested using medical ECG electrodes and typical ECG signals were recorded from some volunteers. Biomedical Technology Department College of Applied Medical Sciences Salman Bin Abdul-Aziz University

- Design of a typical 3-leads ECG system. Research Objectives - Practicing the design of low cost medical devices. - Design of a typical 3-leads ECG system. Biomedical Technology Department College of Applied Medical Sciences Salman Bin Abdul-Aziz University

Design and testing of ECG system using discrete components. Research Problem Design and testing of ECG system using discrete components. Biomedical Technology Department College of Applied Medical Sciences Salman Bin Abdul-Aziz University

Introduction to ECG The electrical activity associated with heart muscles travels through various tissues and reaches the surface of the body where it can be detected by electrodes applied to the skin. The record obtained from the depolarization and repolarization voltages of the heart muscle is called an electrocardiogram or ECG [1], [2]. Biomedical Technology Department College of Applied Medical Sciences Salman Bin Abdul-Aziz University

ECG System Specifications - Three Op-amp Instrumentation amplifier (IA) and an inverting amplifier with total gain of 1000. - Band Width 0.05 – 100 Hz (Low Pass Filter (LPF) and High pass Filter (HPF)). - Notch Filter centered at 60Hz. - CMRR =80 dB Biomedical Technology Department College of Applied Medical Sciences Salman Bin Abdul-Aziz University

The project block diagram Biomedical Technology Department College of Applied Medical Sciences Salman Bin Abdul-Aziz University

ECG designed Power supply Biomedical Technology Department College of Applied Medical Sciences Salman Bin Abdul-Aziz University

Split Power Supply Design Biomedical Technology Department College of Applied Medical Sciences Salman Bin Abdul-Aziz University

Instrumentation Amplifier Circuit Diagram Biomedical Technology Department College of Applied Medical Sciences Salman Bin Abdul-Aziz University

Band Pass Filter circuit diagram Biomedical Technology Department College of Applied Medical Sciences Salman Bin Abdul-Aziz University

A Notch Filter centered at 60 Hz. Biomedical Technology Department College of Applied Medical Sciences Salman Bin Abdul-Aziz University

Constructed ECG circuit Biomedical Technology Department College of Applied Medical Sciences Salman Bin Abdul-Aziz University

ECG System setup and testing Biomedical Technology Department College of Applied Medical Sciences Salman Bin Abdul-Aziz University

Research Outputs 1. An operating ECG system is designed and tested. 2. ECG signals were recorded and displayed. Biomedical Technology Department College of Applied Medical Sciences Salman Bin Abdul-Aziz University

Biomedical Technology Department College of Applied Medical Sciences Salman Bin Abdul-Aziz University

ECG Signal Results Before the Notch Filter. Biomedical Technology Department College of Applied Medical Sciences Salman Bin Abdul-Aziz University

ECG Signal Result After the Notch Filter Biomedical Technology Department College of Applied Medical Sciences Salman Bin Abdul-Aziz University

CONCLUSIONS The constructed single-channel ECG amplifier is capable of acquiring a satisfactory reading of rest ECG signal. It can be expanded to be a multi-channel ECG system capable of recording the standard 12-Lead system. Biomedical Technology Department College of Applied Medical Sciences Salman Bin Abdul-Aziz University

References [1] Bronzino, J.D., The Biomedical Engineering Handbook. CRC Press, Inc., 1995. [2] Carr, J.J. and J.M. Brown, Introduction to Biomedical Equipment Technology. Prentice Hall, Inc., 3rd ed., 1998. Biomedical Technology Department College of Applied Medical Sciences Salman Bin Abdul-Aziz University