A synthetic heart remains one of the long-sought holy grails of modern medicine. Although the heart is conceptually simple—it is, in essence, a muscle that acts as a pump—it contains subtleties that defy straightforward reproduction. Though artificial hearts have been successfully implanted, they are suitable only as temporary replacements in patients awaiting transplants; no device has yet been developed for total replacement of the heart. What is the longest an artificial heart has been used? Discuss
Source: The Free Dictionary