Pull wire for vascular intervention device delivery system
A vascular intervention device delivery system includes a catheter with a proximal end attached to a handle, and a distal carrier segment for mounting a vascular intervention device thereon. A retractable sheath is movable from a first position covering the distal carrier segment to a second position retracted proximally uncovering the distal carrier segment. A pull is attached to the retractable sheath and extends proximally from the retractable sheath toward the handle. A majority of the length of the pull has 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.
1. 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.
2. The vascular intervention device delivery system of claim 1 wherein a proximal segment of the polymer tube covers a segment of the pull that is proximal to a proximal end of the PTFE tube.