Devices, systems, and methods for treatment of intracranial aneurysms

A system comprising:

• an elongate shaft defining a lumen;
• an elongate member slidably disposed within the lumen of the elongate shaft, the elongate member having a proximal end region and a distal end region, wherein the distal end region is configured to be intravascularly positioned at or within an aneurysm cavity;
• and
• an occlusive member constrained within the lumen of the shaft, the occlusive member including a proximal end portion having an opening and a distal end portion detachably coupled to the distal end region of the elongate member, wherein the elongate member extends through the opening, and wherein the occlusive member comprises one or more preferential bending regions about all or a portion of the circumference of the occlusive member, and
• wherein pushing the elongate member from a distal opening in the elongate shaft pulls the occlusive member distally through the distal opening to expel the occlusive member from the shaft and allow the occlusive member to expand to a first expanded state in which the occlusive member has a first shape and the one or more preferential bending regions are positioned between the proximal and distal end portions of the occlusive member, and
• wherein, when the occlusive member is in the first expanded state in the aneurysm cavity and coupled to the elongate member, proximal movement of the elongate member collapses a distal wall of the occlusive member proximally towards a proximal wall of the occlusive member, thereby transforming the occlusive member into a second expanded state in which the occlusive member has a second shape different than the first shape and the one or more preferential bending regions are closer to the aneurysm dome than both of the proximal and distal end portions.