System and method for delivering and deploying an occluding device within a vessel

A method for delivering a self-expanding device within a vessel, the method comprising:

• introducing an assembly and a self-expanding device into a lumen of an elongate member, the assembly comprising an innermost delivery wire extending through a lumen of the device, the delivery wire having a device retaining member for receiving a first end of the device and a proximally positioned retaining member for engaging a second end of the device when the device is positioned against said proximally positioned retaining member;
• the delivery wire having an expandable portion with a radially compressed state and a radially expanded state, wherein the expandable portion is radially constrained by the elongate member and the device as the device and the expandable portion remain within the elongate member;
• positioning an end of the elongate member proximate a weakened wall of a vessel;
• advancing at least a portion of the assembly out of the elongate member, so that the expandable portion forms a pattern of peaks when the first end of the device and the second end of the device move in relation to each other along a length of the assembly as the device is expanded;
• wherein the first end of the device and the second end of the device move relative to each other along a length of the assembly at a first rate;
• and
• wherein the device retaining member and the proximally positioned retaining member move relative to each other along the length of the assembly at a second rate, slower than the first rate.