Trading was halted in shares of three of the world’s largest medical device makers - Medtronic Inc. (nyse: MDT - news - people), Guidant Corp. (nyse: GDT - news - people) and St. Jude Medical Inc. (nyse: STJ - news - people) -- ahead of the release of an important clinical trial on implantable defibrillators, the New York Stock Exchange said.
