Medical device companies have been under pressure lately, but you wouldn't know it by looking at their stocks. Leading cardiac device makers such as Boston Scientific (NYSE:BSX) and St. Jude Medical (NYSE:STJ) have seen their stocks explode behind the market's rally recently, making investors wealthy and igniting hope for more as these companies look to turn around sluggish sales.

St. Jude recently reported its own earnings for the fourth quarter, topping analyst expectations on both its top and bottom lines. Despite the struggles of the cardiac rhythm management industry as of late in slowing sales for devices such as defibrillators, St. Jude's turning the corner in seeing revenue rise once again.

Will St. Jude's successful quarter rub off on fellow cardiovascular leaders Boston Scientific and Medtronic (NYSE:MDT) in their own upcoming quarterly earnings reports? In the video below, Motley Fool contributor Dan Carroll takes you through how St. Jude's bouncing back from the device industry's post-recession downturn -- and how industry trends are pointing in the right direction for top device stocks in the long term.