Simplified biomedical system for artificial defibrillator

Abstract

Many people al over the world suffer f r om heart ailments causing premature death n modern times due to stress poor eating habits and also due to h e r e d i t a r y f a c t o r s as well. Severe changes for the heart beat pattern termed fibrillation is easily i d e n t i f i e d by using an Electrocardiograph : I C Ci). Of the two well known fibrillation c o n d i t i o n s viz. Atrial and Ventricular, the latter is t h e worst just showing a z i g - z a g ECG pattern, c a u s i n g death if not reverted back to normal at soon as possible. This reversing process is t e r m e d as defibrillation.// The defibrillator is an equipment designed tt give a mild electrical impulse in case of atrial fibrillation and a large impulse of the order of several hundred joules in case of ventricular fibrillation.// The principle used in the d e f i b r i l l a t o r is to store energy by means of a c a p a c i t o r and to give a shock in a single impulse t h r o u g h two electrodes kept on the chest of t h e patient.// It has been found that such equipment is t o o e x p e n s i v e and even i n e f f e c t i v e for use in developing countries like Sri Lanka. This had resulted in a cardiologist r e q u e s t i n g the university to fabricate an equipment which is not too e x p e n s i v e but will meet the local need. By discussing with a few cardiologists it was identified that it would be more appropriate to give a series of shocks at intervals first and f that does not work increase the energy of the next series of pulses.// Taking into c o n s i d e r a t i o n the above mentioned factors, a p r o t o t y p e of