Longest lasting implanted heart valve?

[RCB]

Here is a case study of one- you need to scroll down about 25 stories for the abstract, full text in a month:

http://www.tmc.edu/thi/contents.html

This also would be a good time to note our new member Heinz has had a ball and cage valve for 29 years- How about a round of applause. Please take a bow, Heinz