Deflectable catheter shaft section
A deflectable catheter shaft section is disclosed comprising an elongated body extending along a longitudinal axis with a distal end and a proximal end. First and second pull wires can extend along the elongated body and can have a proximal end and a distal end. First and second pull wire liners can be disposed over a portion of one of the first and second pull wires, respectively. Each of the first and second pull wires can have a proximal end and a distal end. A first gap can exist between the proximal end of the first pull wire liner and the proximal end of the elongated body and a second gap can exist between the proximal end of the second pull wire liner and the proximal end of the elongated body.
1. An asymmetrically deflectable catheter shaft section comprising the following:
an elongated body extending along a longitudinal axis and comprising a distal end and a proximal end;
first and second pull wires, wherein each of the first and second pull wires has a proximal end and a distal end, and wherein each of the first and second pull wires extends along the elongated body;
first and second pull wire liners each disposed over a portion of one of the first and second pull wires, respectively, wherein each of the first and second pull wire liners has a proximal end and a distal end; and
a first gap between the proximal end of the first pull wire liner and the proximal end of the elongated body and a second gap between the proximal end of the second pull wire liner and the proximal end of the elongated body, wherein a longitudinal length of the first gap is greater than a longitudinal length of the second gap, the difference in longitudinal length of the first gap and the second gap configured to allow for asymmetric deflection of the catheter shaft section.
2. The deflectable catheter shaft section of claim 1 , wherein:
the first gap is an annular lumen that surrounds the first pull wire between the proximal end of the first pull wire liner and the proximal end of the elongated body; and
the second gap is an annular lumen that surrounds the second pull wire between the proximal end of the second pull wire liner and the proximal end of the elongated body.
3. The deflectable catheter shaft section of claim 1 , wherein the first and second pull wire liners are diametrically-opposed.
4. The deflectable catheter shaft section of claim 1 , wherein:
a bendable stiffening member is disposed over the first pull wire along a portion of the first gap; and
the bendable stiffening member has a proximal end and a distal end.
5. The deflectable catheter shaft section of claim 4 , wherein the distal end of the bendable stiffening member is spaced apart from the proximal end of the first pull wire liner and the proximal end of the bendable stiffening member is spaced apart from the proximal end of the elongated body.
6. The deflectable catheter shaft section of claim 1 , wherein a longitudinal length of the first gap is substantially the same as a longitudinal length of the second gap.
7. The deflectable catheter shaft section of claim 1 , further comprising a pocket at the distal end of the elongated body configured for attachment of a pull ring and tip assembly, wherein the pocket is defined by a recessed area in the distal end of the elongate body.
8. The deflectable catheter shaft section of claim 7 , wherein a distal end of each of the first and second pull wires is connected to a pull ring disposed in the pocket at the distal end of the elongated body.
9. The deflectable catheter shaft section of claim 1 , wherein an inner diameter of the pull wire liner is in a range of 0.0105 inches to 0.0120 inches and an outer diameter of the pull wire liner is in a range of 0.0140 inches to 0.0180 inches.