Pull wire for vascular intervention device delivery system

A vascular intervention device delivery system comprising:

• a handle;
• a catheter with a proximal end attached to the handle, and a distal carrier segment for mounting a vascular intervention device thereon, and defining a longitudinal axis;
• a retractable sheath movable from a first position covering the distal carrier segment to a second position retracted proximally uncovering the distal carrier segment;
• a pull attached to the retractable sheath and extending proximally from the retractable sheath toward the handle, and a majority of a length of the pull having a cross sectional shape with a concave side that faces the longitudinal axis and is opposite to a convex side that faces away from the longitudinal axis;
• the cross sectional shape has a width that is greater than a thickness;
• wherein the pull is metallic;
• the retractable sheath includes a metallic braid welded to the pull at at least one weld location;
• the at least one weld location is laminated between a PTFE tube and a polymer tube.