ST. PAUL, Minn.--(BUSINESS WIRE)--St. Jude Medical, Inc. (“St. Jude Medical”) (NYSE: STJ), a global medical device company, and AGA Medical Holdings, Inc. (“AGA Medical”) (NASDAQ: AGAM), a medical device company focusing on the treatment of structural heart defects and vascular abnormalities, announced today that St. Jude Medical, through a wholly-owned indirect subsidiary, has commenced an exchange offer for all of the outstanding shares of AGA Medical common stock.