A human heart model developed for medical purposes.
It's not my video. It was made by the Chamberlain Group which specializes in making realistic body parts for medical professionals to use. It is also posted by the group who owns the rights: http://ca.youtube.com/watch?v=NI-UO6E...
But a better contact would be: http://www.thecgroup.com/index.html
Which explains about the whole company that produces these models.