A collapsible medical device (10) and associated methods for occluding an abnormal opening wherein the medical device (10) is shaped from a heat treatable metal fabric. The metal fabric is formed from a plurality of metal strands and is heat treated within a mold (30) in order to substantially set a desired shape of the device (10). The medical device (10) includes a fastener (22) for attaching to the end of a guide wire or delivery catheter, wherein the shape of the medical device (10) is formed such that the fastener (22) is attached to the metal fabric within a recess formed in the shape of the medical device (10).
