Devices, systems, and methods for treating aneurysms

A treatment system, comprising:

• a manipulation shaft having a proximal portion and a distal portion;
• an occlusive element coupled to the distal portion of the manipulation shaft, the occlusive element comprising a proximal end, a distal end, and a plurality of filaments secured to one another at the proximal end by a cured material, wherein the cured material defines a channel extending therethrough;
• and
• a detachment element comprising a first end carried by the distal portion of the manipulation shaft and a second end embedded within the cured material at the proximal end of the occlusive element such that the detachment element couples the manipulation shaft to the occlusive element,
• wherein the detachment element is configured so that application of current through the detachment element causes the detachment element to selectively break between the manipulation shaft and the cured material, thereby decoupling the occlusive element from the manipulation shaft.

An occlusive device, comprising:

• a proximal region configured to receive an injection shaft therethrough and a distal region configured to be positioned within an aneurysm;
• a first layer of braided filaments secured to one another at the proximal region by a cured material;
• and
• a second layer of braided filaments secured to one another at the proximal region by the cured material,
• wherein the first layer of braided filaments is radially surrounded by the second layer of braided filaments, and a proximal end of the first layer is disposed proximal of a proximal end of the second layer along a longitudinal axis of the occlusive device.