The 'Flow divertors' are being promoted as an exciting new tool for endovascular treatment of aneurysms previously untreatable, i.e large/giant, serpentine, fusiform, dissecting, blisters etc.
Various exercises were done in the past for these lesions, some successful, some not. The most useful was the concept of flow diversion by some means, which usually entailed sacrificing one or more vessels. The new stent flow divertors -Silk form Balt and Pipeline from eV3 maintain the patency of the arteries while shrinking and healing the aneurysm wihtout the need for open surgery or coiling. The FDA approval of pipeline stent in this regard is a major milestone, even though the real usefulness and harms of the device are  significantly unknown. Have a look at the screenshot of the FDA page below.