Drug delivery system based on polyethylene vinylacetate...

A - Human Necessities – 61 – K

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A61K 9/22 (2006.01) A61K 31/565 (2006.01) A61P 15/18 (2006.01)

Patent

CA 2559224

A drug delivery system consisting of one or more compartments and comprising a progestogenic compound dissolved in a thermoplastic polyethylene vinylacetate copolymer whereby, if the delivery system consists of one compartment, the compartment comprises (i) a core of a thermoplastic polyethylene vinylacetate copolymer comprising the progestogenic compound, such progestogenic compound being dissolved in the polyethylene vinylacetate copolymer up to a concentration below the saturation level at 25~C, and an estrogenic compound; and (ii) a skin of a thermoplastic polyethylene vinylacetate copolymer covering the core, said skin being permeable for both compounds;- if the delivery system consists of more than one compartment, only one compartment comprises (iii) the progestogenic compound, such progestogenic compound being dissolved in a core of a thermoplastic polyethylene vinylacetate copolymer up to a concentration below the saturation level at 25~C, and an estrogenic compound; and (iv) a skin of a thermoplastic polyethylene vinylacetate copolymer covering the core, said skin being permeable for both compounds.

La présente invention se rapporte à un système d'administration de médicament, qui est composé d'un ou plusieurs compartiments et contient un composé progestogénique dissous dans un copolymère de polyéthylène vinylacétate thermoplastique. Si le système d'administration est composé d'un seul compartiment, ce dernier renferme : (i) un noyau d'un copolymère de polyéthylène vinylacétate thermoplastique contenant le composé progestogénique, lequel est dissous dans le copolymère de polyéthylène vinylacétate jusqu'à atteindre une concentration inférieure au niveau de saturation à 25 ·C, et un composé oestrogénique ; et (ii) une enveloppe d'un copolymère de polyéthylène vinylacétate thermoplastique recouvrant le noyau, ladite enveloppe étant perméable aux deux composés. Si le système d'administration est composé de plusieurs compartiments, un seul de ceux-ci renferme : (iii) le composé progestogénique, lequel est dissous dans un noyau d'un copolymère de polyéthylène vinylacétate jusqu'à atteindre une concentration inférieure au niveau de saturation à 25 ·C, et un composé oestrogénique ; et (iv) une enveloppe d'un copolymère de polyéthylène vinylacétate thermoplastique recouvrant le noyau, ladite enveloppe étant perméable aux deux composés.

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