Patent ID: 8109983

Claim:
An implantable endoprosthesis delivery system, comprising: an inner member having a first region with an outer circumference having a polygonal transverse cross-section, a proximal region disposed proximally of the first region, and a distal region disposed distally of the first region; wherein the proximal region and the distal region have a circular transverse cross-section; wherein the polygonal transverse cross-section defines a maximum diagonal of the first region; wherein the proximal region has a proximal outer diameter and the distal region has a distal outer diameter; wherein the proximal outer diameter, the distal outer diameter, or both are smaller than the maximum diagonal of the first region; an outermost member at least partially surrounding the inner member; a stent bumper connected to the distal region, the stent bumper having an outer diameter that is smaller than the maxium diagonal of the first region; and an implantable medical endoprosthesis disposed between the inner member and the outermost member, the endoprosthesis having a proximal-most end that is disposed distal to a distal-most end of the first region of the inner member, wherein the inner member and the outermost member are configured so that a plurality of circumferentially spaced portions of the outer circumference of the first region of the inner member contact an inner circumference of the outermost member.