So far, only one person has benefited from Frazier and Cohn's artificial heart. Craig Lewis was suffering from amyloidosis in 2011 when his heart gave out and doctors pronounced that he had only 12 to 24 hours to live. After obtaining permission from his family, Frazier and Cohn replaced his heart with their device. Lewis survived for another 5 weeks after the operation; he eventually succumbed to liver and kidney failure due to his amyloidosis, after which his family asked that his artificial heart be unplugged.