Ventana Medical Systems, Inc. Announces It Will Not Increase Its Offer To Acquire Vision Systems Limited Under Scheme Of Arrangement; Intends To File Patent Litigation Against Vision In United States Federal Court

TUCSON, Ariz.--(BUSINESS WIRE)--Sept. 17, 2006--Ventana Medical Systems, Inc. (NASDAQ:VMSI) today announced that it will not increase the price offered under the Vision Systems Limited (ASX:VSL) Scheme of Arrangement and will immediately commence to file patent litigation against Vision in US federal court.