Prosthetic heart valve including stent structure and tissue...

A - Human Necessities – 61 – F

Patent

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A61F 2/24 (2006.01) A61L 27/36 (2006.01)

Patent

CA 2672899

A prosthetic heart valve includes an annular stent having annularly spaced commissure portions. The tips of the commissure portions are preferably covered with fabric, and then additional fabric covers that fabric and the remainder of the stent, both inside and out (possibly also including a sewing ring insert at or near the base or inflow edge). The fabric is then covered by a layer of tissue, again both inside and out. A single sheet of additional tissue is mounted around the outside of the previously assembled components. This additional tissue forms the leaflet portions of the valve. The leaflet portions of the additional tissue are shaped by contact with a shaped mandrel, and the tissue of the structure is subjected to fixation (e.g., cross-linking) to produce a completed valve.

Une valvule cardiaque prothétique comprend un stent annulaire ayant des parties de commissure espacées de façon annulaire. Les extrémités des parties de commissure sont, de préférence, recouvertes de tissu, puis du tissu supplémentaire recouvre ce tissu et le reste du stent, à la fois à l'intérieur et à l'extérieur (le cas échéant comprenant également un insert annulaire de couture à ou près de la base ou de la bordure d'entrée). Le tissu est ensuite recouvert par une couche de tissu, à nouveau à la fois à l'intérieur et à l'extérieur. Une feuille unique de tissu supplémentaire est montée autour de l'extérieur des composants précédemment assemblés. Ce tissu supplémentaire forme les parties de feuillet de la valvule. Les parties de feuillet du tissu supplémentaire sont façonnées par contact avec un mandrin façonné, et le tissu de la structure est soumis à une fixation (par exemple, réticulation) pour obtenir une valvule terminée.

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