OPTIMIZED DESIGN OF HEART ASSIST DEVICES

Abstract

Hart failure may b. caused by fails of its conduct. Lon system or because of the failure of hurt muscle to propel the +wit of blacod required for bases noucri ent,, Cardiac pacemaker is the treatment of choice for conduction probleas of the heart,# The other typo of heart failure Is cured by asohanical heart assisting ds rices such as parall+ . pu ap,, tai. series pump and Intra Aartio ] loon punpi . The Important design parameter for the cardiac pacemaker are rat*,* threshold voltage and the shape of the stimulating pulse. Polerizatizi at the electrodes tend to *hang. the tbr.eho34 voltage required d for stimulating the cardiac auso3a. Also the r*ctangu3.ar shape of the stisuleting the cardiac suede, Also the rectangular ehap, of the stisulating current vavefors which has been used uptil now is not optima from the point of energy ainlaizatton. As a result, paceasker battery has to be replaced very often,# Therefore, a design whi ooh correctly predicts the threshold requirement of the etisulet. Los current, taking Into account the polarisation .ff.ots at the eleetrodss and at the sear time utilises a pulse + ape which draws minimum energy froa the paceraker battery to needs-. Precisely with this objective the present thesis was undertaken..