Low radial force filter
AssigneeCook Medical Technologies LLC
InventorsJeppe Dufresne Johnsen, Bent Oehlenschlaeger, Erik Rasmussen, Palle Hansen
Life of this patent
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Abstract
The disclosure provides a filter apparatus and method of filtering in a body vessel. The filter apparatus comprises a filter unit and an expandable introducer designed to deliver the filter unit to the target filtering site. The filter unit attaches to the expandable introducer via a plurality of anchors on the filter unit. The expandable introducer delivers and presses the anchors to the vessel wall during implantation. After implantation, the filter unit exerts minimal or about zero radial force against the vessel wall.
Claims20
A method of treatment in a body vessel having a wall, the method comprising:
- positioning a filter apparatus having an anchor disposed in a casing in the body vessel, the filter apparatus comprising:
- a filter unit having a filter leg comprising a first end extending to a second end including the anchor being biased to curl;
- and
- an expandable introducer having the casing removably attached to the filter unit at the anchor, the expandable introducer having a slider connected to a plurality of introducer levers, wherein the apparatus has a collapsed state and an expanded state for attaching the filter unit to the wall;
- moving the slider to extend the plurality of introducer levers to the wall;
- contacting the anchor against the wall by way of the expandable introducer by moving the apparatus from the collapsed state to the expanded state;
- and
- attaching the anchor to the wall by removing the anchor from the casing.
A method of treatment in a body vessel having a wall, the method comprising:
- positioning a filter apparatus having an anchor disposed in a casing in the body vessel, the filter apparatus comprising:
- a filter unit having a filter leg comprising a first end extending to a second end including the anchor being biased to curl;
- and
- an expandable introducer having the casing removably attached to the filter unit at the anchor, wherein the apparatus has a collapsed state and an expanded state for attaching the filter unit to the wall;
- expanding the expandable introducer, the expandable introducer having a slider connected to a plurality of introducer levers, each introducer lever extending to one of a plurality of filter carriers, the step of expanding comprising moving the slider to extend the filter carriers and introducer levers to the wall;
- contacting the anchor against the wall by way of the expandable introducer by moving the apparatus from the collapsed state to the expanded state;
- and
- attaching the anchor to the wall by removing the anchor from the casing.
A filter apparatus for use in a body vessel having a wall, the apparatus comprising:
- a filter unit having a filter point and a plurality of filter legs extending from the filter point, each filter leg comprising a first end extending from the filter point to a second end comprising an anchor being biased to curl;
- and
- an expandable introducer having a casing removably attached to the filter unit at the anchor, the expandable introducer having a slider connected to a plurality of introducer levers, each introducer lever extending to one of a plurality of filter carriers, the slider being movable to extend the filter carriers and the introducer levers to the wall, wherein the apparatus has a collapsed state and an expanded state for attaching the filter unit to the wall, wherein each of the plurality of filter carriers terminates in the casing.
Dependencies are inferred from the claim text.