A pharmaceutical tablet system that floats on gastric fluid...

A - Human Necessities – 61 – K

Patent

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Details

A61K 9/20 (2006.01) A61K 9/00 (2006.01)

Patent

CA 2441123

A tablet system for prolonged floating in or on gastric fluid for releasing therein pharmaceutically active substances in an alternate succession of substance release and no-release periods is made up of a multilayered core placed in a cup-shaped envelope. The core is made up of release layers and no- release layers devoid of pharmaceutically active substance, superposed in alternate succession. The cup-shaped envelope covers bottom and side surfaces of the core while leaving exposed an upper surface of the core. The cup-shaped envelope provides for buoyancy by being formed of a compression-sintered mixture comprising hydrophobic material and inert powdered filler. The hydrophobic material is composed of fatty and/or waxy material capable of being sintered by compression and whose bulk density is lower than gastric fluid density. The powdered filler has a loose powder density that is lower than gastric fluid density.

La présente invention concerne un système de comprimé permettant audit comprimé de flotter dans ou sur un liquide gastrique pour y libérer des substance pharmaceutiquement actives en une succession alternée de périodes de libération et de non libération, constitué d'un noyau multicouche disposé dans un enrobage en forme de coupelle. Le noyau est constitué de couches de libération et de non libération non pourvues de substance pharmaceutiquement active, superposées en succession alternée. L'enrobage en forme de coupelle recouvre les surfaces inférieures et latérales du noyau tout en laissant un surface supérieure du noyau découverte. L'enrobage en forme de coupelle confère une flottabilité en étant constitué d'un mélange fritté par compression comportant un matériau hydrophobe et une charge pulvérulente inerte. Le matériau hydrophobe est constitué d'une substance grasse et/ou cireuse apte à être frittée par compression et dont le poids volumique apparent est inférieure à la densité de liquide gastrique. La charge pulvérulente présente une densité de poudre meuble inférieure à la densité de liquide gastrique.

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