| 摘要 |
<p>Retrievable vena cava filters for the temporary or permanent prevention of Pulmonary embolism (PE) are disclosed. A filter in accordance with the present invention has a tube-within-tube structure with overlapping semi-spheres. The semispheres comprise a plurality of expandable legs. The first tube may have a plurality of slots allowing for deployment of a first, second, third or fourth sets of expandable legs on the second tube. The free end of each leg in the first set of expandable legs is oriented in a direction opposite to the free end of each leg in the second set forming a cage which comprises legs from the first and second sets of expandable legs. The design of the present invention allows retrieval of the filter by a catheter and snare from either end of the filter.</p> |
