Two-planar vena cava filter with self-centering capabilities

Details Two-planar vena cava filter with self-centering capabilities Two-planar vena cava filter with self-centering capabilities

A - Human Necessities

61

F

A61F 2/01 (2006.01)

Patent

CA 2411713

A self-centering filter is useful for trapping blood clots, reducing their size and arresting their further migration from the vena cava into pulmonary circulation. The two-planar filter design is formed from a conical array of filter wires wherein two sets of filter wires are included, each set differing in length from the other. The filter wires diverge from a common apex at one end and extend radially outwardly therefrom to an attachement end attachable to the wall of a blood vessel such that the attachement ends of the first set of wires are anchored at a location spaced apart from the location of anchoring of the attachement ends of the second set, effecting a two-planar filter design. This establishes a single filtering element having two planes of contact with the vein wall which also provides for centering of the filtering element. At least one of the sets of wires contains barbs, e.g. hooks, for anchoring the filter to the inner venal wall.

L'invention concerne un filtre autencentreur servant à piéger des caillots sanguins, à réduire leur taille, et à arrêter leur migration de la veine cave dans la circulation pulmonaire. La conception du filtre biplan représente un réseau conique de fils du filtre comprenant deux ensembles de fils du filtre, chaque ensemble présentant une longueur différente. Les fils du filtre divergent d'un sommet commun, à une extrémité, d'où ils s'étendent radialement vers une extrémité de fixation à la paroi du vaisseau sanguin, de sorte que les extrémités de fixation du premier ensemble de fils soient ancrées à des emplacements distants de l'emplacement d'ancrage des extrémités de fixation du second ensemble de fils, ce qui donne une configuration de filtre biplan. On obtient ainsi un élément filtrant simple présentant deux plans de contact avec la paroi de la veine, ce qui assure également le centrage de l'élément filtrant. Au moins un des ensembles de fils présente des ardillons, p. ex. des crochets, qui ancrent le filtre à la paroi intérieure de la veine.

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