| 摘要 |
<p>The tablet system has a core-centered body covered with at least one couple of adjacent layers, one element fully enclosing the other. The enclosed element contains active substance and will, upon exposure to aqueous medium, undergo complete degradation during a period of release of active substance. The enclosing element is devoid of active substance and formulated to delay the latter's release from the enclosed element by a non-release period. To this effect, it has an intrinsic porosity that will remain constant while allowing and controlling the penetration of the aqueous medium towards the underlying enclosed element whose alteration will in turn cause a fragmentation of the enclosing element that will allow the aqueous medium to directly reach the enclosed element and provide for rapid establishment and progress to completion of the release of active substance. The layers may be made by spray-coating and/or pressing.</p> |
