| 摘要 |
IN A DEVICE FOR THE CONTROLLED RELEASE OF ACTIVE SUBSTANCES IN LIQUID MEDIA FROM AN ACTIVE SUBSTANCE-CONTAINING MATRIX EXHIBITING ACTIVE SUBSTANCE RELEASING-SURFACES, THE ACTIVE SUBSTANCE RELEASING-SURFACES OF THE MATRIX ARE COVERED, AT LEAST PARTIALLY, BY AN ERODIBLE MASS OF SOLIDS; THE THICKNESS OF THE ERODBLE MASS ACROSS ITS EXTENT ON THE ACTIVE SUBSTANCE RELEASING-AREAS IS DETERMINED BY GRADIENTS.
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