Laminar structure for administering a chemical at a controlled r

Details Laminar structure for administering a chemical at a controlled r Laminar structure for administering a chemical at a controlled r

1989-03-10

1990-06-05

Robinson, Ellis P.

Drug, bio-affecting and body treating compositions

Preparations characterized by special physical form

Web, sheet or filament bases; compositions of bandages; or...

424447, 424449, A61F 1302

Patent

active

049312812

ABSTRACT:
A laminar structure for administering a chemical at a controlled release rate is disclosed. The structure comprises a backing member which acts as a boundary through which the chemical does not pass. Contacting at least a portion of the backing member is a chemical containing layer having therein a first chemical portion and a second chemical portion. The first and second chemical portions comprise a mixture of chemical in a first concentration transport mode and a second concentration transport mode. The mixture being in a ratio to give a desired chemical release rate from the chemical containing layer.

REFERENCES:
patent: 4291015 (1981-09-01), Keith et al.
patent: 4557934 (1985-12-01), Cooper

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