| 摘要 |
Plaque removal system with a catheter having a long, generally flexible portion of a first material, an intermediate portion of a second thermally insulating material and a heatable tip portion of a third material. The tip is grounded and focuses radio frequency waves upon the tip to heat the tip. The position of the tip is determined by dispensing a contrast medium out the distal end of the catheter and viewing the vessel and catheter by x-ray. The heated tip is pushed forward through the vessel blockage to vaporize or otherwise disintegrate the plaque, which clears a path through the vessel.
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