| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an improved vein filter to further facilitate its removal even if used as a temporary filter.SOLUTION: The present invention relates to a vessel filter movable between a collapsed position for delivery to the vessel and an expanded position for placement within the vessel, and having a filter portion having a converging region to direct particles toward the center of the filter portion. The filter portion converges into a tubular portion. A second region is flared in the expanded position to have a transverse dimension increasing in a direction away from the filter portion and includes a vessel engaging portion. A first region has a spacer to keep the filter more toward a center of a vessel, wherein in the collapsed position the filter extends axially in an elongated position cranially of the cranial end of the filter and in the expanded position the filter forms a looped region extending radially with respect to a longitudinal axis of the filter. The spacer has a first end attached to the internal surface of the tubular portion, the first end extending within the tubular portion and emerging cranially from the tubular region to form the looped region.</p> |
