I've seen various types of hinges on the market they go by different names depending on the manufacturer and the prices also vary substantially from one company to another. The one in the picture is called a swing clear hinge made by Stanley. When the doors open it completely swings out of the way giving you an additional 1 3/4 of additional width, a regular standard 32 in-store now provides an opening almost 34 inches wide and that my friends allows you to keep your knuckles and can even make rooms which are inaccessible usable.
The paragraph below comes from the Stanley site. The product is great yet I couldn't help but chuckle when I read the description There is absolutely nothing wrong with it except you can tell it was not written by someone in a wheelchair. We speak of barrier free codes and allowing wide equipment to pass without damaging doors and frames or the equipment.
"Hello, it's our fingers we are tired of leaving behind and in most cases we are the equipment!"
Wherever doors are required to meet barrier-free codes or are required to swing completely clear of the openings so that wide equipment can pass through without damaging doors and frames or the equipment The LifeSpan® hinge line (Stanley CB) is covered by a limited lifetime warranty for the life of the building "FBB" line: The Stanley FBB hinge line emphasizes rugged dependability "F" line: For residentail or light commercial use