Interference-relief type delivery detachment systems

An implant for occluding a target area of a patient's vasculature, comprising:

• a shell comprising globular inner and outer braid layers that define a plurality of openings, the inner and outer braid layers and openings collectively defining a shell porosity, the shell comprising a distal region and a proximal region, the shell being expandable from a compressed configuration to an expanded configuration;
• a proximal hub component coupled to the proximal region of the shell thereby gathering and securing the inner and outer braid layers of the proximal region;
• and
• an intermediate braid layer, interposed between the inner and outer braid layers, coupled to the shell along at least the proximal region thereof, the intermediate braid layer comprising a plurality of pores extending therethrough,
• wherein the shell and the intermediate braid layer provide a combined porosity less than the shell porosity such that blood flow into the implant is more restricted along the proximal region than along the distal region of the shell,
• wherein the intermediate braid layer has a proximal end that is not secured within the proximal hub and a distal end that terminates at a position proximal to a distal end of the shell.