Oligo-ethylene glycol-based polymer compositions and methods...

A - Human Necessities – 61 – K

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A61K 47/34 (2006.01)

Patent

CA 2714156

The invention provides biodegradable PEAs, PEURs and PEUs that are synthesized by solution polycondensation to include .alpha.-amino acids and oligo-ethylene ether segments in the polymer backbone. The polymers can be obtained by substituting oligo- ethylene glycol (OEG) for aliphatic di-acid and diols during their fabrication. Also provided are compositions in which bioactive agents are dispersed in the polymers. The compositions biodegrade by enzymatic action to release incorporated bioactive agents and oligo-ethylene glycol segments, which are fully biodegradable at a molecular weight less than 400 Da,. Due to their comparatively rapid surface enzymatic hydrolysis, the compositions can be used to deliver bioactive agents in a controlled manner within a relatively rapid delivery time, such as about 18 to 24 hours.

La présente invention concerne des PEA, des PEUR et des PEU biodégradables qui sont synthétisés par polycondensation en solution de manière à comprendre des acides aminés alpha et des segments oligo-éthylène éther dans le squelette polymère. Les polymères peuvent être obtenus par substitution d'oligo-éthylène glycol (OEG) par du di-acide aliphatique et des diols pendant leur fabrication. Cette invention concerne également des compositions dans lesquelles des agents bioactifs sont dispersés dans les polymères. Ces compositions sont biodégradables par action enzymatique pour libérer les agents bioactifs incorporés et les segments oligo-éthylène glycol, qui sont totalement biodégradables à un poids moléculaire inférieur à 400 Da. En raison de leur hydrolyse enzymatique superficielle comparativement rapide, les compositions peuvent être utilisées pour diffuser des agents bioactifs de manière contrôlée dans un laps de temps de diffusion relativement court, par exemple, 18 à 24 heures.

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