| 摘要 |
A steerable elongated medical device that is capable of forming as “s” shaped bend and having a guidewire tip at its distal end. The devices include an outer tube extending between an outer tube proximal segment and an outer tube distal segment, having an outer tube wall forming an outer tube lumen and first and second elongated outer tube slots through the outer tube wall to the outer tube lumen. The first elongated outer tube slot has a first portion and a second portion and formed between a first outer tube slot proximal end and a first outer tube slot distal end and extending axially along the outer tube distal segment through a first outer tube slot length to define a first cutaway portion of the outer tube. The second elongated outer tube slot has a first portion and a second portion and formed between a second outer tube slot proximal end and a second outer tube slot distal end and extending axially along the outer tube distal segment through a second outer tube slot length to define a second cutaway portion of the outer tube and offset about 180 degrees from the first elongated outer tube slot. Each of the first and second outer tube slots have reinforcing sleeves, each of the reinforcing sleeves having reinforcing sleeve slot portions and reinforcing sleeve overlap portions. The medical devices further include a handle coupled to the outer tube proximal end, and a pull wire positioned within the outer tube lumen and extending between a pull wire proximal end coupled to the handle and a pull wire distal end comprising a guidewire tip, the pull wire extending through the first and second reinforcing sleeve lumens, the outer tube lumen, and a distal pull wire stop, and the guidewire tip extending distally from the distal pull wire stop, wherein the pull wire proximal end is adapted to be manipulated to separate the pull wire proximal end from the outer tube proximal end to induce a bend in each of the first and second cutaway portions.
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