A - Human Necessities – 61 – F
Patent
A - Human Necessities
61
F
A61F 2/24 (2006.01)
Patent
CA 2496643
Methods for forming a support frame for flexible leaflet heart valves from a starting blank include converting a two-dimensional starting blank into the three-dimensional support frame. The material may be superelastic, such as NITINOL, and the method may include bending the 2-D blank into the 3-D form and shape setting it. A merely elastic material such as ELGILOY may be used and plastically deformed in stages, possibly accompanied by annealing, to obtain the 3-D shape. Alternatively, a tubular blank could be formed to define a non-tubular shape, typically conical. A method for calculating the precise 2- D blank shape is also disclosed. A mandrel assembly includes a mandrel and ring elements for pressing the blank against the external surface of the mandrel prior to shape setting.
L'invention concerne des procédés permettant de former un châssis porteur de valvules cardiaques à feuillets souples à partir d'une ébauche de départ, qui consistent à transformer une ébauche de départ bidimensionnelle en châssis porteur tridimensionnel. Le matériau peut être superélastique, par exemple du NITINOL, le procédé pouvant consister à plier l'ébauche 2-D dans la forme 3-D et la mettre en forme. On peut utiliser un matériau purement élastique, par exemple ELGILOY, auquel on fait subir une déformation plastique progressive, éventuellement accompagnés d'un recuit, pour obtenir la forme en 3-D. Autre possibilité, on pourrait former une ébauche tubulaire pour définir une forme non tubulaire, d'ordinaire conique. L'invention concerne un procédé permettant de calculer avec précision la forme de l'ébauche en 2-D. Un ensemble mandrin comporte des éléments mandrin et bague destinés à presser l'ébauche contre la surface externe du mandrin avant la mise en forme.
Edwards Lifesciences Corporation
Stikeman Elliott S.e.n.c.r.l.,srl/llp
LandOfFree
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