Swiss researchers have developed a machine that, they say, can keep human livers alive outside of the body for one week. Current technology and methods are only able to keep human livers alive for up to 24 hours. The new machine is able to keep the liver active by performing several functions normally carried out by the human body. Researchers say they expect the technology to greatly increase the number of livers available for transplant. This could save the lives of many patients suffering from severe liver disease who need to have their liver replaced.