Bio-absorbable plastic device for clinical practice

A - Human Necessities – 61 – L

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A61L 31/04 (2006.01) A61L 17/10 (2006.01) A61L 17/12 (2006.01) A61L 29/14 (2006.01) A61L 31/06 (2006.01) A61L 31/14 (2006.01) A61L 31/16 (2006.01)

Patent

CA 2427601

Bio-absorbable polymers for use as medical materials for vascular stent and suture thread have almost defined dynamic properties such as tensile strength and almost defined decomposition rate for absorption. When the dynamic properties thereof are elevated, therefore, the bio-absorbable polymers turn fragile, involving slower decomposition rate. When the decomposition rate is elevated, further, the dynamic properties are deteriorated. Disadvantageously, such bio-absorbable polymers have limited purposes for use and limited sites for use. Thus, copolymerization of a bio-absorbable monomer as lactide with a cyclic depsipeptide can allow the adjustment of the dynamic properties and decomposition rate of the resulting copolymer via the content of the depsipeptide.

Ces polymères bioabsorbables utilisés en médecine, notamment comme stents et articles de suture, conservent des propriétés dynamiques quasiment constantes (résistance à la traction, etc.) ainsi que quasiment la même vitesse de dégradation causée par l'absorption. Si l'on souhaite améliorer ces propriétés dynamiques, ces matériaux se fragilisent et la vitesse de dégradation est réduite. Si l'on souhaite accélérer la vitesse de dégradation, ce sont alors les propriétés dynamiques qui se détériorent et il en découle que les fins d'utilisation et les sites d'utilisation se restreignent. De ce fait, dans le cadre de cette invention, on copolymérise un polymère bioabsorbable à l'aide d'un depsipeptide cyclique, afin d'obtenir un copolymère possédant l'ouverture de cycles d'un depsipeptide copolymérisé. Il est, de ce fait, possible de maîtriser les propriétés dynamiques ainsi que la vitesse de dégradation en fonction du contenu du depsipeptide.

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