Delayed total release two pulse gastrointestinal drug...

A - Human Necessities – 61 – K

Patent

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Details

A61K 9/24 (2006.01) A61K 9/28 (2006.01) A61K 31/192 (2006.01) A61K 31/196 (2006.01)

Patent

CA 2375714

a two pulse gastrointestinal delivery system is provided. The system comprises a desired agent in combination with a swellable core material, the core being surrounded by an inner coat of a water--insoluble or relatively water-insoluble coating material in which particulate water-insoluble material is embedded. The inner coat is additionally surrounded by an outer coat that contains additional amounts of the desired agent. When the delivery device enters the gastrointestinal tract, the outer coat releases the desired agent contained therein and disintegrates, exposing the inner coat. The particulate matter in the inner coat takes up liquid, thus forming channels interconnecting the drug-containing core with the outside of the delivery device. Through these channels liquid enters the core which then swells to the point at which the inner coat is broken. When the integrity of the inner coat is destroyed, the core then disintegrates, immediately releasing all or most of the drug at a specific site. By controlling parameters in the device, such as the core material, carrier material in the coating, and particulate matter, the location of release of both pulses of the drug can be carefully controlled. The invention is also directed to a method of using the device for the treatment of disease by the release of drugs in the gastrointestinal tract in a location- and time-dependent manner.

L'invention concerne un système d'administration gastro-intestinal à deux impulsions, comprenant un agent spécifique en combinaison avec un matériau noyau gonflable, le noyau étant entouré d'une couche intérieure d'un matériau de revêtement hydro-insoluble ou relativement hydro-insoluble, contenant une substance hydro-insoluble particulaire. En outre, la couche intérieure est enveloppée d'une couche extérieure contenant des quantités supplémentaires dudit agent. Lorsque le dispositif d'administration pénètre dans le tractus gastro-intestinal, la couche extérieure libère l'agent spécifique qu'elle contient et se désagrège, exposant ainsi la couche intérieure. La substance particulaire de la couche intérieure s'imprègne de liquide, ce qui constitue des canaux reliant le noyau contenant le médicament et la partie extérieure du dispositif d'administration. Grâce à ces canaux, le liquide peut pénétrer dans le noyau, qui commence à gonfler jusqu'à la rupture de la couche intérieure. Après destruction de l'intégrité de la couche intérieure, le noyau se désagrège à son tour, libérant immédiatement la totalité ou une partie du médicament en un site spécifique. En contrôlant les paramètres du dispositif, tels que le matériau noyau, l'excipient du revêtement et la substance particulaire, on peut maîtriser avec précision le lieu de libération des deux impulsions du médicament. L'invention concerne également un procédé d'utilisation du dispositif dans le traitement de maladies par la libération de médicaments dans le tractus gastro-intestinal en fonction de l'emplacement et du temps.

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