Microdevices comprising nanocapsules for controlled delivery...

A - Human Necessities – 61 – K

Patent

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Details

A61K 9/58 (2006.01) A61K 9/51 (2006.01)

Patent

CA 2615939

This application relates to a microdevice for delivering drugs to a target location. The microdevice comprises a plurality of nanocapsules assembled together, each having an outer hydrophobic shell and an inner liquid core contained within the shell. At least one drug is dissolved within the inner liquid core. The liquid core comprises a mixture of solvents including at least one solvent for maintaining the hydrophilicity of the inner core (and hence the phase difference between the polymeric shell and the liquid core) and at least one second solvent for enhancing the solubility and bioavailability of the drug. For example, the second solvent may be selected to enable a hydrophobic drug to dissolve within the hydrophilic inner core environment. The inner core may also include a small amount of water-soluble polymer. The application also relates to a method of making the microdevices by formulating a homogenous emulsified solution containing the drug and forming the nanocapsules from the emulsified solution, such as by an atomization process.

L'invention concerne un micro-dispositif d'administration de médicaments à un emplacement cible. Le micro-dispositif comprend une pluralité de nanocapsules assemblées, ayant chacune une enveloppe hydrophobe externe et un noyau liquide interne contenu dans l'enveloppe. Au moins un médicament est dissous dans le noyau liquide interne. Le noyau liquide comprend un mélange de solvants englobant au moins un solvant pour maintenir l'hydrophilie du noyau interne (et donc la différence de phase entre l'enveloppe polymère et le noyau liquide) et au moins un second solvant pour améliorer la solubilité et la biodisponibilité du médicament. Par exemple, le second solvant peut être sélectionné pour permettre à un médicament hydrophobe de se dissoudre dans l'environnement de noyau interne hydrophile. Le noyau interne peut également inclure une petite quantité de polymère soluble dans l'eau. L'invention concerne également un procédé de fabrication des micro-dispositifs par formulation d'une solution émulsionnée homogène contenant le médicament et par formation des nanocapsules à partir de la solution émulsionnée, par exemple par un processus d'atomisation.

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