Bionic Heart
 

In 1982 the first patient received an implanted artificial heart went on to survive for 112 days. So far the longest that someone has survived with an artificial heart is just over 20 months. An artificial heart typically weighs a kilogram and is made of metal and plastic and powered by external batteries. Researchers in Texas have been working on a "non-beating" heart that pumps blood continuously. The idea is that these are more durable and can be made smaller.  They are now used in a small number of patients who are awaiting a transplant.
 

A new generation of cardiac assist system is being developed as a permanent alternative to heart transplants for patients suffering heart failure. A company called Ventracor is selling a product called VentrAssist which can also be used as a bridge to heart transplant and possibly as a bridge to recovery, where it may allow a deteriorating heart an opportunity to recuperate.
 

VentrAssist has only one moving part which is a hydro dynamically suspended impeller. It has been designed to have no wearing parts or cause blood damage. It is a blood pump that connects to the left ventricle of the diseased heart to help the ailing heart's pumping function and assist in restoring a better quality of life. The implanted parts of the VentrAssist device use materials which are fully biocompatible including titanium alloys. Its components are light, strong, non-toxic and highly resistant to degradation within the body.

It weighs just 298 grams (10oz) and measures 60mm (2.5 inches) in diameter, making it suitable for both children and adults.

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