Pre-stressed devices incorporating materials subject to...

A - Human Necessities – 61 – F

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A61F 2/24 (2006.01)

Patent

CA 2364138

A method and apparatus for pre-stressing devices incorporating materials subject to stress softening is disclosed, as well as the resulting device. The method includes fabricating a heart valve with an inflow side and an outflow side. At least a portion of the heart valve includes a material subject to stress softening. The material experiences stress when a pressure differential occurs between the inflow side and the outflow side of the valve. The method includes creating a stress in the material prior to implantation in order to stabilize the stress/strain response of the material prior to implantation.

La présente invention concerne un dispositif et un appareil de précontrainte de dispositifs comportant des matériaux soumis à l'adoucissement de contrainte, et concerne également le dispositif résultant. Ce procédé consiste à fabriquer une valvule cardiaque pourvue d'un côté d'admission et d'un côté d'expulsion. Au moins une partie de la valvule comprend un matériau soumis à l'adoucissement de contrainte. Ce matériau subit une contrainte lorsqu'un différentiel de pression de produit entre le côté d'admission et le côté d'expulsion de la valvule. Ce procédé consiste à créer une contrainte dans le matériau avant son implantation de manière à stabiliser la réponse de contrainte /déformation du matériau avant son l'implantation.

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