Apparatus and methods for making leaflets and valve...

A - Human Necessities – 61 – F

Patent

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A61F 2/24 (2006.01)

Patent

CA 2609398

A method for making a bioprosthetic heart valve includes providing a non- contact cutting apparatus and a layer of tissue . The non-contact cutting apparatus may include a laser cutting system or high pressure water jet system. A leaflet (40) is cut from the layer of tissue using a predefined template, and a plurality of alignment holes (42) in the leaflet are created in the leaflet, e.g., along a peripheral edge (40c) . A support structure (52) is provided having a plurality of alignment holes corresponding to alignment holes in the leaflet. The leaflet is secured to the support structure by securing one or more sutures (84) through corresponding alignment holes in the leaflet and the support structure to provide a leaflet subassembly. A bioprosthetic heart valve is made by securing a set of leaflet subassemblies (80) to a frame (56) .

L'invention concerne un procédé de fabrication d'une valvule cardiaque bioprothétique comprenant un appareil de coupe sans contact et une couche de tissu cellulaire. L'appareil de coupe sans contact peut comporter un système de coupe au laser ou un système de jet d'eau sous pression. Un feuillet (40) est découpé dans la couche de tissu en utilisant un gabarit prédéfini, et une pluralité de trous d'alignement (42) sont créés dans le feuillet, par ex. le long d'un bord périphérique (40c). Une structure de support (52) comporte une pluralité de trous d'alignement correspondant aux trous d'alignement dans le feuillet. Selon l'invention, le feuillet est immobilisé sur la structure de support en immobilisant une ou plusieurs fils de suture (84) à travers les trous d'alignement correspondants dans le feuillet et la structure de support pour obtenir un sous-assemblage de feuillets. Une valvule cardiaque bioprothétique est fabriquée en immobilisant un ensemble de sous-assemblages de feuillets (80) sur un cadre (56).

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