Stentless support structure

Details Stentless support structure Stentless support structure

A - Human Necessities

61

F

A61F 2/06 (2006.01) A61F 2/24 (2006.01)

Patent

CA 2613958

A stentless support structure capable of being at least partly assembled in situ. The support structure comprises a braided tube that is very flexible and, when elongated, becomes very long and very small in diameter, thereby being capable of placement within a small diameter catheter. The support structure is preferably constructed of one or more thin strands of a super- elastic or shape memory material such as Nitinol. When released from the catheter, the support structure folds itself into a longitudinally compact configuration. The support structure thus gains significant strength as the number of folds increase. This radial strength obviates the need for a support stent. The support structure may include attachment points for a prosthetic valve.

Cette invention concerne un structure support sans stent pouvant être assemblée au moins partiellement in situ. Cette structure comprend un tube tressé très souple qui, une fois étiré, atteint une très grande longueur pour un très faible diamètre, ce qui permet de le disposer dans un cathéter de petit diamètre. La structure support est de préférence constituée d'une ou de plusieurs brins d'un matériau superélastique tel que du Nitinol. Une fois détachée du cathéter, la structure support se replie sur elle-même en un ensemble serré dans le sens longitudinal. Ainsi, cette structure augmente sensiblement en robustesse au fur et à mesure que le nombre de plis augmente. Cette robustesse radiale rend superflu l'emploi d'un stent support. La structure support peut inclure des points de fixation pour une valve prothétique.

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