3M Co. reported it has finalized an agreement to acquire Acelity Inc. and its KCI (Kinetic Concepts Inc.) subsidiaries from an investor group for $4.3 billion. In addition, 3M will assume approximately $2.4 billion of Acelity's debt. The $6.7 billion total transaction represents the largest deal in the St. Paul, Minn.-based company's history. The acquisition of the wound care company bolsters 3M's medical solutions business, one of the most profitable segments of the struggling conglomerate's portfolio.