Abstract

An expandable frame (24) for an embolic filtering device used to capture embolic debris in a body vessel includes a first half frame (42) having a first control arm (46) connected to a second control arm (48) by a partial loop (50) and a second half frame (44) having a first control arm (52) connected to a second control arm (54) by a partial loop (56). The partial loops cooperatively form a composite loop for attachment of a filtering element which will expand in the body vessel to capture embolic debris entrained in the fluid of the vessel. The expandable frame and filtering element can be mounted on a filter support structure (60), such as a coiled wire, and mounted on a guide wire (28). The expandable frames include an articulation region (72) which helps to distribute the strain which can be developed when the frame moves between an expanded and deployed position. The expandable frame may include further strain distributing bends (104, 106, 108) which help distribute strain and increase the bendability of the frame.
L'invention concerne un châssis dilatable pour un dispositif de filtration embolique utilisé pour piéger des débris emboliques dans un vaisseau corporel. Ce châssis dilatable comprend une première moitié munie d'un premier bras de commande relié à un second bras de commande par une boucle partielle et une seconde moitié munie d'un premier bras de commande relié à un second bras de commande par une boucle partielle. Ces boucles partielles coopèrent pour former une boucle composite destinée à fixer un élément de filtration qui se dilate dans le vaisseau corporel afin de piéger des débris emboliques entraînés dans le fluide du vaisseau. Le châssis dilatable et l'élément de filtration peuvent être montés sur une structure de support du filtre, telle qu'un fil en spirale, et monté sur un fil-guide. Le châssis dilatable comprend une région d'articulation qui favorise la distribution de la contrainte, laquelle peut se développer lorsque le châssis bascule entre une position dilatée et une position déployée. Le châssis dilatable peut comprendre davantage de courbes distributrices de la contrainte qui favorisent la distribution de la contrainte et augmentent l'aptitude au pliage du châssis.

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