Non-compliant balloon with compliant top-layer to protect...

A - Human Necessities – 61 – F

Patent

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Details

A61F 2/06 (2006.01) A61M 25/00 (2006.01) A61M 29/02 (2006.01)

Patent

CA 2471772

In order to minimize the potential for damage to bio-compatible and/or therapeutic-containing stent coatings, there is provided a compliant elastic sheath over layer between a non-compliant stent expansion balloon and an unexpanded stent, which is secured over the balloon with a securing crimp. This stent deployment assembly, which is mounted on a catheter, is maneuvered through a patient's body to a desired deployment site and then inflated to expand the stent to the desired diameter. During expansion, the compliant elastic material between the stent and the non-compliant balloon prevents non- compliant balloon-induced damage to the stent's coating, as well as preventing degradation of the non-compliant balloon by, for example, stent-caused punctures. The deflated non-compliant stent expansion balloon and compliant elastic sheath are then withdrawn from the patient's body, leaving the deployed stent at the desired implantation site with its coating substantially intact.

L'objectif de la présente invention est de minimiser le potentiel d'endommagement de revêtements pour endoprothèse biocompatibles et/ou renfermant des médicaments. A cette fin, une gaine élastique flexible se trouve sur une couche entre un ballonnet de dilatation non flexible et une endoprothèse non dilatée, fixée au ballonnet au moyen d'une pince de fixation. L'ensemble de déploiement d'endoprothèse, monté sur une sonde, est manipulé dans le corps du patient jusqu'à un site de déploiement souhaité, puis est gonflé afin de dilater l'endoprothèse jusqu'au diamètre souhaité. Lors de la dilatation, le matériau élastique flexible entre l'endoprothèse et le ballonnet non flexible permet d'empêcher le ballonnet non flexible d'endommager le revêtement d'endoprothèse et d'empêcher des perforations induites par endoprothèse, par exemple, d'endommager le ballonnet non flexible. Le ballonnet de dilatation d'endoprothèse non flexible dégonflé et la gaine élastique flexible sont ensuite retirés du corps du patient, laissant l'endoprothèse déployée au niveau du site d'implantation souhaité, avec son revêtement sensiblement intact.

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