Stents for autologous tissue heart valve

Details Stents for autologous tissue heart valve Stents for autologous tissue heart valve

A - Human Necessities

61

F

A61F 2/24 (2006.01)

Patent

CA 2179263

An improved set of stents for autologous tissue heart valves is provided. The stents are designed with the aid of a computer-aided-design (CAD) system, and nest within each other to securely champ a piece of tissue which forms the leaflets of the heart valve. The geometrical features of the stents are designed to provide uniform nesting between the stents to prevent the formation of stress raisers on the tissue. Additionally, the windows in the stent posts are narrowed to prevent the suturing needle used during implantation of the valve from becoming lodged in the garter springs which clamp the outer stent to the inner stent. Finally, the sock covering the outer stent is bonded to the stent base at both upper and lower locations to isolate the bonds from the patient's blood flow.

L'invention décrit un ensemble amélioré de supports pour des valvules cardiaques en tissu autologue. Ces supports sont réalisés à l'aide d'un système de conception assistée par ordinateur (CAO) et se logent l'un dans l'autre afin de serrer de manière sûre un morceau de tissu qui forme les feuillets de la valvule. Les caractéristiques géométriques des supports sont destinées à assurer leur emboîtement uniforme, afin d'empêcher l'apparition de zones de tension dans le tissu. Les fenêtres des montants des supports sont en outre rétrécies afin d'empêcher l'entrée de l'aiguille de suture utilisée pendant l'implantation de la valvule dans les ressorts cylindriques en anneau qui serrent le support extérieur sur le support intérieur. Enfin, le manchon qui recouvre le support extérieur est fixé à la base du support à la fois en haut et en bas, afin d'isoler les points de fixation de la circulation sanguine du patient.

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