Stent fabrication via tubular casting processes

Details Stent fabrication via tubular casting processes Stent fabrication via tubular casting processes

A - Human Necessities

61

F

A61F 2/82 (2006.01) A61L 31/10 (2006.01) A61L 31/16 (2006.01) A61L 31/18 (2006.01)

Patent

CA 2725296

Tubular casting processes, such as dip-coating, may be used to form substrates from polymeric solutions which may be used to fabricate implantable devices such as stents. The polymeric substrates may have multiple layers which retain the inherent properties of their starting materials and which are sufficiently ductile to prevent brittle fracture. Parameters such as the number of times the mandrel is immersed, the duration of time of each immersion within the solution, as well as the delay time between each immersion or the drying or curing time between dips and withdrawal rates of the mandrel from the solution may each be controlled to result in the desired mechanical characteristics. Additional post-processing may also be utilized to further increase strength of the substrate or to alter its shape.

L'invention fait appel à des procédés de coulée tubulaire, tels que l'enrobage par trempage, pour former, à partir de solutions polymériques, des substrats pouvant être utilisées dans la fabrication de dispositifs implantables tels que des stents. Les substrats polymériques peuvent comprendre de multiples couches qui conservent les propriétés inhérentes à leurs matières premières et qui sont suffisamment ductiles pour empêcher la rupture fragile. Afin d'obtenir les caractéristiques mécaniques désirées, on peut régler des paramètres tels que le nombre d'immersions du mandrin, la durée de chaque immersion dans la solution et l'attente entre chaque immersion, ou le temps de séchage ou de durcissment entre les trempages et la vitesse à laquelle on retire le mandrin de la solution. On peut également recourir à un post-traitement supplémentaire afin d'augmenter encore la résistance du substrat ou d'en modifier la forme.

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