15-02-2011, 05:42 PM
if u hav any ppts abt it plz plz send to my mail id:ajay447.kumar[at]gmial.com
15-02-2011, 05:42 PM
if u hav any ppts abt it plz plz send to my mail id:ajay447.kumar[at]gmial.com
22-02-2011, 09:18 AM
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Jibin Philip Artificial Heart.ppt (Size: 478 KB / Downloads: 116) Artificial Heart Heart disease – very common Many people suffer from heart disease. Some of the diagnosed cases are so severe that patients may not survive the wait for a donor heart. In the 1960s the purpose of an artificial heart was for to temporarily support patients until a donor heart became available The Changing Scene Surgeons attempted to change this in1980s by implanting an artificial heart intended for long term therapy. The NEED for artificial heart Main Causes • Coronary Heart Disease (CHD) • Congestive Heart Failure (CHF) • Lack of organ donors • Availability problems Working Of Human Heart Four chambers • Right Atrium • Right Ventricle • Left Atrium • Left Ventricle Working Of Human Heart Deoxygenated blood flows from body to the right atrium. Oxygenated blood flows from the lungs to the left atrium. Deoxygenated blood flows from right ventricle to lungs. Oxygenated blood flows from the left ventricle to the rest of the body. Research & Development Assist Devices • Arrow Lion Heart • Jarvik - 2000 Total Artificial Heart • Jarvik-7 (1982) • Abiocor (2001) Assist Devices Left ventricle assist devices Device work parallel with heart and reduce work load of heart Giving less strain for heart muscles Lion Heart Pump Consist of : • Blood Pump • Electric Coil Power Sources • Heart Rate Controller • Gas Volume Accumulator Working of Lion Heart Pump High speed DC motor drives roller screw mechanism. Roller screw mechanism turn rotational motion of motor into linear motion of pusher plate. Pusher plate uniformly compresses a blood sac during pump ejection. As plate releases pressure, blood fills the sac O/p of the pump varies from 3 to 7 liters per minute. The heart rate of the pump is controlled by computer system implanted in the patient’s abdomen. Rechargeable batteries in controller unit provide function when uncouples the external battery pack Artificial Hearts Works in place of biological heart Only to class 4 heart failure patients The Abiocor Artificial Heart Developed Abiomed and Texas Heart Institute. Internal components are the Abiocor thoracic unit, battery, controller and the wireless energy transfer coil (TET). Working of Abiocor Abiocor has chambers on left and right sides At center lies an electric motor which turns a centrifugal pump at 5000 to 9000 rpm The pump propels a viscous hydraulic fluid second electric motor turns gating valve As fluid fills the left section, its plastic membrane bulges, outward, pushing blood out of the Abiocor’s left chamber. At the same time, hydraulic fluid empties from the right section and its membrane deflates allowing blood to flow into the devices right chamber. |
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