REINFORCED SHEATH AND WIRE ASSEMBLY AND VASCULAR INTERVENTION DEVICE DELIVERY SYSTEM USING SAME
A reinforced cardiovascular sheath and wire assembly includes an inner tube with an external surface extending between a proximal end and a distal end. A reinforcement braid is in contact with the external surface of the inner tube. A wire with a distal segment is interwoven into, and in contact with, the reinforcement braid. A proximal segment of the wire extends proximally from the proximal end of the inner tube out of contact with the reinforcement braid. An outer tube receives, and is in contact with, the reinforcement braid and the inner tube. A vascular intervention device delivery system utilizes the sheath/wire assembly as a retractable sheath and pull wire.
1 . A reinforced cardiovascular sheath and wire assembly comprising:
an inner tube with an external surface extending between a proximal end and a distal end;
a reinforcement braid in contact with the external surface of the inner tube;
a wire with a distal segment interwoven into, and in contact with, the reinforcement braid, and a proximal segment extending proximally from the proximal end of the inner tube out of contact with the reinforcement braid; and
an outer tube receiving, and in contact with, the reinforcement braid and the inner tube.
2 . The assembly of claim 1 wherein the inner tube has length that is about equal to a length of the outer tube; and
the reinforcement braid has length that is shorter than both the inner tube and the outer tube.
3 . The assembly of claim 1 wherein the proximal segment of the wire is longer than the distal segment.
4 . The assembly of claim 1 wherein the inner tube is PTFE;
the outer tube is a polymer jacket; and
the wire is metallic.
5 . The assembly of claim 1 wherein the inner tube has length that is longer than the distal segment of the wire.
6 . The assembly of claim 1 wherein the wire has a cross section with a width that is greater than a thickness.
7 . The assembly of claim 1 wherein the wire has a curved cross section with a concave side that is opposite to a convex side.
8 . The assembly of claim 1 wherein a proximal segment of the wire extends proximally beyond the proximal end of the reinforcement braid, and is laminated between the inner tube and the outer tube.
9 . The assembly of claim 1 wherein the distal segment of the wire includes a plurality of side notches that each receive a respective strand of the reinforcement braid.
10 . The assembly of claim 1 wherein different strand segments of the reinforcement braid are in contact with an inner surface and an outer surface, respectively, of the distal segment of the wire.
11 . The assembly of claim 1 wherein the distal segment of the wire has a curved cross section with a curvature that matches a curvature of the the reinforcement braid.
12 . 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 that includes a reinforcement braid and is movable from a first position covering the distal carrier segment to a second position retracted proximally uncovering the distal carrier segment;
a pull wire mechanically attached to, and in contact with the reinforcement braid of, the retractable sheath and extending proximally from the retractable sheath toward the handle.
13 . The vascular intervention device delivery system of claim 12 wherein a distal segment of the pull wire is interwoven into the reinforcement braid.
14 . The vascular intervention delivery system of claim 12 including a stability sheath that receives at least a portion of each of the pull wire, the catheter and retractable sheath; and
a 5 Fr. self expanding stent mounted about the distal carrier segment of the catheter.
15 . The vascular intervention delivery system of claim 12 wherein reinforcement braid is laminated between an inner PTFE liner tube and an outer polymer tube, and the reinforcement braid is metallic; and
the pull wire is metallic.
16 . The vascular intervention delivery system of claim 12 including a thumbwheel rotatably mounted in the handle and connected to a proximal end of the pull wire.
17 . The vascular intervention delivery system of claim 12 wherein the pull wire has a curved cross section with a curvature that matches a curvature of the reinforcement braid.
18 . The vascular intervention delivery system of claim 12 wherein a proximal segment of a polymer tube of the retractable sheath covers a segment of the pull wire that is proximal to a proximal end of the reinforcement braid.
19 . The vascular intervention delivery system of claim 12 wherein a distal segment of the pull wire includes a plurality of side notches that each receive a respective strand of the reinforcement braid.
20 . The vascular intervention delivery system of claim 12 wherein different strand segments of the reinforcement braid are in contact with an inner surface and an outer surface, respectively, of a distal segment of the pull wire.