Guidant deal rides roller coaster:
Indianapolis-based medicaldevice maker Guidant Corp. spent most of 2005 shifting from one crisis to the next, as it endured national publicity over product defects, scores of shareholder and patient lawsuits, and marathon negotiations with potential buyers over its future. By the end of the year, it still had no clear vision for what that future holds. New Jersey-based Johnson & Johnson agreed in December 2004 to buy Guidant for $25.4 billion in cash and stock. That deal quietly moved through…