(yeah, I know its old, I just saw it)
Apparently there's a constant flow heart under development - interesting stuff. Should put less of a load on the circulatory system given the lack of pressure pulses, although as pointed out in the article having it respond to the body's demands could be challenging
Best bit has to be one of the comments:
"No pulse?
By Steen Hive Posted Tuesday 14th October 2008 02:26 GMT
S'pose I'll have to revise my criteria for "shaggable", then."