Flexible heart valve having moveable commissures

A - Human Necessities – 61 – F

Patent

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Details

A61F 2/24 (2006.01)

Patent

CA 2422009

A flexible prosthetic tissue-type heart valve having commissures that are substantially decoupled from a cusp support structure. The valve includes three leaflets having arcuate cusp edges and opposed free edges, with outwardly-directed attachment tabs therebetween. A cusp support structure in either one or more pieces attaches to the leaflet cusp edges. Three commissures are each formed partly with an axially-extending insert member to which two adjacent leaflet tabs attach. An inverted V-shaped clip maintains close contact between the adjacent leaflet tabs and provides a stress- relieving clamping action in conjunction with the insert member. The insert member attaches about its lower end to base sections of the cusp support structure, or to an intermediate sewing ring, so that the commissures may pivot about the cusp support structure. The sewing band is scalloped and enables attachment of the valve along the scalloped aortic root so as to couple the valve to the natural motion of the aorta. Increased vibrational damping results from this biomechanical coupling.

L'invention concerne une valvule cardiaque souple, prothétique du type tissu, laquelle est dotée de commissures étant sensiblement découplées d'une structure de soutien de valves. La valvule comprend trois feuillets présentant des bords de valves arqués et des bords libres opposés, des pattes de fixation dirigées vers l'extérieur étant placées entre ceux-ci. Une structure de soutien de valves soit monobloc soit en plusieurs pièces est fixée aux bords de valves des feuillets. Les trois commissures sont formées partiellement avec un élément d'insertion s'étendant de façon axiale, deux pattes de feuillets adjacentes étant fixées à cet élément. Un clip en forme de V à l'envers maintient un contact étroit entre les pattes de feuillets adjacentes et assure une action de serrage avec libération des contraintes conjointement avec l'élément d'insertion. Celui-ci est fixé, au niveau de son extrémité inférieure, aux sections de base de la structure de soutien de valves, ou à un anneau de couture intermédiaire, de manière que les commissures puissent pivoter autour de la structure de soutien de valves. La bande de couture est festonnée et permet la fixation de la valvule le long de l'anneau aortique festonné, de manière à coupler la valvule au mouvement naturel de l'aorte. Un tel couplage biomécanique permet d'obtenir un amortissement des vibrations amélioré.

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