Device for effecting the controlled release of active...

Details Device for effecting the controlled release of active... Device for effecting the controlled release of active...

A - Human Necessities

61

K

A61K 9/20 (2006.01) A01N 25/34 (2006.01) C05G 5/00 (2006.01) C11D 3/48 (2006.01) C11D 17/00 (2006.01)

Patent

CA 2177972

With the proposed device for effecting the controlled release of active substances in liquid mediums from a matrix containing the said substances and provided with release surfaces, the release surfaces are at least in part covered with an erodible solid material. The thickness of the said solid material covering on the release surfaces follows specific gradients.

L'invention concerne un procédé de libération contrôlée de principes actifs dans des substances liquides, à partir d'une matrice contenant lesdits principes actifs et comportant des surfaces de libération desdits principes actifs. Ces surfaces de libération des principes actifs de la matrice sont recouverts au moins en partie par une matière solide érodable dont l'épaisseur est déterminée par des gradients sur toute son étendue.

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