Leonardo da Vinci and heart valves

The Times last week reported how the anatomical drawings of Leonardo inspired Francis Wells, consultant cardiac surgeon at Papworth Hospital in Cambridgeshire, to change the way he operates. The story is at http://www.timesonline.co.uk/article/0,,2-1801070,00.html. It was Leonardo's drawings of the operation of the heart valves that provided Mr. Wells with his "eureka" moment, says the story.