| 摘要 |
<p>A guide catheter includes a body and a centering mechanism. The body has an elongatable section and a lumen with a stop. The centering mechanism is a plurality of bias elements that forms a self-expanding basket attached to the body so that the elongatable section is within the basket. A straightening catheter engages the stop to stretch the elongatable section and to flatten the basket against the body. The guide catheter can be inserted into a vessel and the centering mechanism can be positioned at a desired treatment site by means of an over-the-wire guidewire system. The straightening catheter can be removed to allow the self-expanding basket to center the guide catheter in the vessel. A dosing device can then be inserted into the guide catheter and located at the centered basket to deliver the brachytherapy to prevent restenosis.</p> |
