Innovation is the lifeblood of any winning stock, but not every industry group in IBD’s database is known for it. Slow-moving, defensive groups can have their day in the sun, but innovation drives earnings growth. So it makes sense to target groups that are home to several top-rated names. As of Wednesday’s IBD, the Medical-Systems/Equipment group ranked No. 5 out of 197 groups ranked by IBD based on six-month price performance.