Patent ID: 8366736
Filing Date: 2013-02-05
Classification: A61B,A61F

Abstract:
1. A vessel filter comprising a first region and a second region, the filter movable between a collapsed position for delivery to a vessel and an expanded position for placement within the vessel, the first region having a filter portion having a converging region to direct particles toward a center of the filter, the first region including a plurality of spaced apart elongated struts and a plurality of connecting struts extending at an angle from the elongated struts, adjacent connecting struts being joined to form closed geometric shapes in the first region, the second region being flared in the expanded position to have a transverse dimension increasing toward a second end portion opposite the filter portion, the second region including a plurality of elongated struts having a longitudinal axis and a vessel engaging portion at the second end portion and terminating in vessel engaging hooks, the hooks having penetrating tips directed toward the filter portion, the hooks positioned at a distal portion of the elongated struts of the second region, the elongated struts of the second region rotated about the longitudinal axis to form a twisted region wherein a portion of the elongated struts of the second region proximal of the twisted region and a portion of the elongated struts of the second region distal of the twisted region extend along their length in a distal direction away from the filter portion, the struts of the second region being twisted in a memorized position and untwisted in the collapsed position for delivery and thereby forming a straighter region so the hooks have a reduced profile and the struts of the second region rotated to form the memorized twisted region in the expanded position when exposed from a delivery sheath for placement of the filter, the twisted regions of the struts of the second region being unattached to the twisted region of an adjacent strut adjacent the twisted regions.