Having already fought it out in Delaware, London and Washington, a battle between two of the world’s biggest medical device companies is coming to Dublin.  Court filings show Abbott Laboratories filed proceedings against Edwards Lifesciences with the High Court.  The companies have been fighting over a new type of medical device: a tiny, delicately engineered clamp, made out of wire mesh, which is fixed to a valve inside the heart.  The clamp’s job is to fix something called mitral valve regurgitation. That’s a condition where the heart valve doesn’t close tightly, allowing blood to flow backwards into the heart. It…