MEDICAL GUIDEWIRES FOR TORTUOUS VESSELS

摘要

Three groups of guidewire embodiments are described with particularly suitable structures for navigating circuitous vessels, especially blood vessels of the brain. Some of the guidewires have a hyperbolic taper that provides desired flexibility. In some embodiments, an integrated guide structure provides for extension in the blood vessel of a corewire to provide for extended reach of the guidewire. In further embodiments, the guidewire has a flexible tip that can be guided directly by the flow in the vessel.

主权项

1. An integrated guiding device comprising:
a corewire, and an overtube with a lumen wherein the corewire extends through the lumen of the overtube,
the corewire comprising a flattened section along the distal half of the corewire, and the overtube comprising an indentation aligned with the flattened section with a fraction of the lateral extent of the flattened section of the corewire wherein the flattened section and indentation provide for torque coupling of the corewire and overtube and a defined amount of lateral motion of the corewire relative to the overtube,wherein the corewire extends from a distal end of the overtube in a configuration with the overtube drawn in a proximal direction relative to the corewire to the extent provided by the aligned indentation of the overtube interfacing with the flattened section of the corewire and wherein the portion of the corewire extending from the overtube is unattached to the overtube.