Chemical delivery device

Details Chemical delivery device Chemical delivery device

2005-11-01

2005-11-01

Spear, James M. (Department: 1615)

Drug, bio-affecting and body treating compositions

Preparations characterized by special physical form

Tablets, lozenges, or pills

C424S468000, C424S474000, C424S475000, C424S482000

Reexamination Certificate

active

06960357

ABSTRACT:
The invention provides a controlled release dissolution and diffusion devices which can deliver an active ingredient at a constant or controlled-variable rate comprising an active ingredient and dissolution modifiers and/or an insoluble matrix. The compressed core is coated, except for at least one exposed face, with a coating containing an insoluble polymer or a mixture of an insoluble polymer and pore-forming elements said pore-forming elements having a dissolution rate slower that the release rate so that the pore formation is completed after release of the active ingredients and the residual inert structures disintegrate.

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