Oil-core compositions for the sustained release of...

A - Human Necessities – 61 – K

Patent

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A61K 9/12 (2006.01) A61K 9/107 (2006.01) A61K 9/16 (2006.01) A61K 31/337 (2006.01) A61K 31/445 (2006.01)

Patent

CA 2375371

Physiologically active oil-core particles, and a method of making physiologically active oil-core particles that include a hydrophobic core material, a hydrophobic drug dissolved or suspended in the core material, and a layer of amphipathic lipids surrounding the hydrophobic core. An optional continuous phase can be an oil-immiscible solution. In one aspect, the method involves the use of a volatile solvent that is removed after the formation of the suspension. The suspension can be used substantially as created, or the particles formulated as a solid dosage form. In another aspect, the particles are formed substantially simultaneously with the volatilization of a propellant, for example, by spraying through an atomizing actuator. The resulting particles have superior particle size distribution and yield properties. The method is appropriate for use with physiologic agents that would be sensitive to heating during the encapsulating process, and also allows aseptic processing by filtration without heating the solutions used in processing.

L'invention concerne des particules à noyau huileux physiologiquement actives, et un procédé de préparation desdites particules, comprenant une matière noyau hydrophobe, un médicament hydrophobe dissout ou en suspension dans la matière noyau, et une couche de lipides amphipathiques entourant le noyau hydrophobe. Une solution non miscible dans l'huile peut éventuellement constituer une phase continue. Dans un mode de réalisation, le procédé consiste à utiliser un solvant volatile que l'on retire après la formation de la suspension. La suspension peut être utilisée sensiblement telle quelle, ou les particules peuvent être formulées sous forme pharmaceutique solide. Dans un autre mode de réalisation, les particules sont formées sensiblement simultanément grâce à la volatilisation d'un pulseur, par exemple par pulvérisation au moyen d'un atomiseur. Les particules obtenues possèdent une répartition de taille de particule et des propriétés de rendement supérieures. Le procédé est adapté pour être utilisé avec des agents physiologiques sensibles à la chaleur lors du processus de mise en gélules, et permet également un conditionnement aseptique par filtration sans chauffer les solutions utilisées dans le conditionnement.

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