| 主权项 |
1. A vessel filter comprising a first region, a second region, and a longitudinal axis having a midpoint, the first region having a filter portion having a converging region to direct particles toward a center of the filter, the converging region converging into a tubular portion at a proximal end of the filter, the first region including a plurality of spaced apart elongated struts extending from the tubular portion and angling outwardly from the tubular portion, a first elongated strut of the elongated struts having a first dividing region in the filter region proximal of the midpoint and dividing into a first and second connecting strut distal of the first dividing region, the first and second connecting struts having a smaller transverse width than a transverse width of the first elongated strut from which they extend, a width of the first elongated strut at the dividing region being equal to a width of the first elongated strut proximal to the first dividing region, the first connecting strut extending at an angle from the first elongated strut in a first direction and the second connecting strut extending at an angle from the first elongated strut in a second different direction, the first connecting strut having a proximal end at the first dividing region and a distal end where the first connecting strut joins at a first joining region a third connecting strut extending in toward the first connecting strut from a second dividing region of a second elongated strut of the plurality of elongated struts, and the second connecting strut having a proximal end at the first dividing region and a distal end where the second connecting strut joins at a second joining region a fourth connecting strut extending in toward the second connecting strut from a third dividing region, the first and third connecting struts converging along their entire length toward each other from the respective first and second dividing region to the first joining region and the second and fourth connecting struts converging toward each other along their entire length from the respective first and third dividing region to the second joining region, a first distal elongated strut extending distally from first joining region where the first connecting strut joins the third connecting strut and a second distal elongated strut extending distally from the second joining region where the second connecting strut joins the fourth connecting strut, the first and second distal elongated struts terminating in free ends and a first transverse dimension of the filter at the free ends exceeds a second transverse dimension of the filter at the filter portion, the second region including a vessel engaging portion at a distal end portion, the filter movable between a collapsed position for delivery to a vessel and an expanded position for placement within the vessel wherein in the collapsed position the connecting struts, elongated struts and tubular portion are flush. |
