Multi-layer folding flow diverters

An implant shapeable to a cylindrical shape and movable to an implanted shape, the implant comprising:

• a first section comprising a first outer layer;
• a second section comprising a second outer layer foldable to contact the first outer layer;
• and
• a third section comprising a third outer layer foldable to contact the second outer layer,
• wherein, when in the implanted shape, the implant comprises a three-layer overlapping section comprising the first outer layer, the second outer layer, and the third outer layer, and
• wherein, when in the implanted shape, the three-layer overlapping section is disposed proximate an aneurysm neck.

A method comprising:

• deploying, via a catheter, a first section of a flow diverter through a vessel and distal to an aneurysm neck;
• inverting a second section of the flow diverter, causing the second section to contact an inner lumen of the first section;
• positioning the second section of the flow diverter such that the second section traverses the aneurysm neck;
• moving the catheter proximal to the aneurysm neck and, concurrently, deploying a third section of the flow diverter via the catheter;
• and
• creating an overlapping section of the flow diverter proximate the aneurysm neck, the overlapping section comprising at least a portion of the first section, the second section, and the third section.