| 摘要 |
A catheter having a lumen with a distal end opening and a side opening. A tubular member (e.g., needle or other cannula) is moveable between a retracted position where it is within the catheter lumen proximal to the side opening and an extended position where it extends out of the side opening. When the tubular member is in its retracted position its lumen is substantially coaxial with the catheter lumen such that a guidewire may extend through the lumen of the tubular member and out of the distal end opening of the catheter. The guidewire may then be retracted into the lumen of the tubular member and the tubular member may ten be advanced out of the side opening. Thereafter, the same guidewire (or a different guidewire) may be advanced out of the distal end of the tubular member. Also disclosed are methods for using such catheter to redirect a guidewire or other member and for bypassing an obstruction in a blood vessel such as a chronic total occlusion (CTO) of an artery.
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