An assembly for deploying an implant into an aneurysm. The assembly comprises: a tubular member (66) having a member lumen (86) in the tubular member and an opening (84) at a distal end portion of the tubular member； a coil implant (100) configured for placement into an aneurysm and having a coil (90)； a coil lumen extending longitudinally within the coil； and a securing member (94) extending within the coil lumen, coupled to the coil at a distal region of the securing member, and having an enlarged proximal portion (96) larger than, and positioned distal to, the opening； and an elongate member (52) extending in the member lumen, through the opening, and coupled to the enlarged portion. The assembly is configured such that proximal movement of the elongate member relative to the distal end portion results in the enlarged portion contacting the distal end portion and separating from the elongate member.
