BOSTON – What are companies doing to be successful in the current environment of med-tech M&A valuation? That question was posed to panelists from three top device makers during the Medtech Conference Tuesday morning. Specifically, the panel, which featured representatives from New Brunswick, N.J.-based Johnson & Johnson, Medtronic plc and Boston Scientific Corp., looked at overall valuations across the sector, as well as what it takes to produce a successful M&A strategy.