A prosthesis deployment system (1) has a positioning member (40) at least partially disposed within a tubular segment (21) of a tip assembly (18), the positioning member being movable between nondeployed and deployed configurations. In the nondeployed configuration the positioning member permits the tip assembly to move relative to an enlarged body assembly (35). When an enlarged body (22) is at a position farther away from a tip body, e.g. at the edge of the tubular segment, the positioning member (40) can move or flare to its deployed configuration to inhibit the enlarged body from moving relatively closer to the tip assembly. Axial force applied to the tip assembly during withdrawal of the tip assembly can be transmitted via the positioning member to the enlarged body assembly to facilitate its withdrawal from the body.
