Forget having a wide economic moat, some companies are so attractive from an investment point of view that they have a "super wide moat". One of those, according to Morningstar, is medical technology firm Medtronic.

The wide moat is down to the firm's leadership position in the industry, and because of its investments in emerging technologies which sets up a lot of potential for the company's future.

But what takes this to a super wide moat level, is because Medtronic is going to buy Covidien, and the potential these two firms have together is really worth knowing about.