| 摘要 |
<p>An intravascular filter (2) having a filament (6) which expands a filter element (4). The filter filament (6) is a coil (20) which is stretched to reduce the diameter of the coil (20) for introduction. The filter element (4) is preferably biased toward the closed position and is opened by the coil (20) when tension is released on the coil (20). The filament (6) slides along the internal surface (19) of the filter element (6) so that the filter element (6) may assume intermediate positions.</p> |
