An analyst downgraded two of the largest medical device makers Wednesday amid uncertainty about the health of the U.S. and European economies.The downgrade came one day after Medtronic, the device industry’s bellwether, reiterated its forecast of revenue growth of just 1 to 3 percent for the coming year. Medtronic and other companies have seen business hurt by steep cuts in hospital budgets and safety concerns involving their leading devices, especially implantable heart defibrillators.
