BELLEVUE, Wash. & CHAPEL HILL, N.C.--(BUSINESS WIRE)--Researchers from UNC Health Care today reported positive, interim results from the largest ever prospective multi-institution study of any medical device aimed at helping surgical teams prevent and detect retained foreign objects in surgery. The ongoing study examined the use of radio-frequency detection technology (RF Surgical Detection System, RF Surgical) as an adjunct to the standard practice of manual counting.