PLAINSBORO, N.J., June 4, 2007 (PRIME NEWSWIRE) -- Integra LifeSciences Holdings Corporation (Nasdaq:IART) announced today that it has commenced a private offering, subject to market conditions, of $125 million aggregate principal amount of senior convertible notes due 2010 and $125 million aggregate principal amount of senior convertible notes due 2012 (together, the “notes”)