A major medical products firm has joined the ranks of consumers suing the Triad Group Inc., a Wisconsin company accused of supplying potentially contaminated wipes blamed for illnesses and death. Smith & Nephew Inc., a global medical device and equipment supplier with offices in the U.S., argues in a lawsuit that Triad’s well-publicized troubles have cost the company $3.2 million in lost inventory and more in legal fees to defend against claims from victims. “Triad failed to exercise ordinary care to prevent any defective condition which would render its products unsafe for their intended uses,” said the lawsuit filed Thursday in U.S. district court in Tennessee. In the U.S. Smith & Nephew operates as a Delaware corporation with principle offices in Memphis.