Mike Hooven, the founder and former CEO of AtriCure Inc., is leaving the board of the Mason-based medical device maker. Hooven will be a consultant to the company (NASDAQ: ATRC), which specializes in treating atrial fibrillation (a common malady characterized by an irregular and fast heartbeat). He was chief executive officer from November 2000 to August 2002 and chief technology officer from August 2002 to December 2006. Hooven is now CEO of Enable Injections, an Evendale-based firm he founded…