Medical device companies don't have the flash that biotech stocks or other healthcare stocks do. Their profit margins are often tight, and they can appear boring to the average investor.

Beneath that boring exterior, though, can lie companies with strong, predictable growth. (NYSE: MDT), one of the largest medical device companies, has increased revenue by 84% over the past decade, while its shares have gone up 63% in that period.

Patterson Companies (NASDAQ: PDCO) and Merit Medical (NASDAQ: MMSI), on the other hand, aren't as well known as Medtronic but are solid medical device companies with a strong record of earnings growth. 

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Source Fool.com