Percutaneous permanent retrievable vascular filter
First Claim
1. A filter comprising,a first tube having a plurality of a first set of expandable legs, each leg of the first set having an end secured to the first tube and a free end,a second tube having a plurality of a second set of expandable legs and a plurality of a third set of expandable legs, each leg of the second set having an end secured to the second tube and a free end,each leg of the third set comprising an expandable segment and having an end secured to a third tube,the second tube'"'"'s external diameter and the third tube'"'"'s external diameter being less than the first tube'"'"'s internal diameter,wherein the second and third tubes are inserted into the first tube,the first tube having a plurality of slots, each slot being positioned at a radial position on the first tube allowing for deployment of the expandable segment in each leg of the third set and for deployment of each expandable leg of the second set, the slots being oriented parallel to the cylindrical axis of the first tube,wherein the free end of each leg in the first set is oriented in a direction opposite to the free end of each leg in the second set.
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Accused Products
Abstract
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 semi-spheres comprise a plurality of expandable legs. The first tube may have a first set of expandable legs and a plurality of slots allowing for deployment of a second or third set 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 filter of the present invention may be retrieved by a catheter and snare. The third set of expandable legs conveys the vector force from the closing of the first set to the second set to cause it to collapse.
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Citations
21 Claims
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1. A filter comprising,
a first tube having a plurality of a first set of expandable legs, each leg of the first set having an end secured to the first tube and a free end, a second tube having a plurality of a second set of expandable legs and a plurality of a third set of expandable legs, each leg of the second set having an end secured to the second tube and a free end, each leg of the third set comprising an expandable segment and having an end secured to a third tube, the second tube'"'"'s external diameter and the third tube'"'"'s external diameter being less than the first tube'"'"'s internal diameter, wherein the second and third tubes are inserted into the first tube, the first tube having a plurality of slots, each slot being positioned at a radial position on the first tube allowing for deployment of the expandable segment in each leg of the third set and for deployment of each expandable leg of the second set, the slots being oriented parallel to the cylindrical axis of the first tube, wherein the free end of each leg in the first set is oriented in a direction opposite to the free end of each leg in the second set.
Specification