The heart was a plastic device designed to replace Mr. Green's ventricles, and was fitted by surgically removing the actual ventricles, with plastic tubes to replace the valves. The device is then plugged into the plastic valves to complete the artificial system. There is a tube going through the skin (pictured above) which sends pulses of air into two balloon-like sacs in the artificial ventricles which acts as the contractions of the ventricular muscles for ventricular systole. This is powered by a driver unit which weighs around 7kg.
Mr. Green is being closely monitored for risk of his body rejecting the device and the risk of infection.
