Controlled release system

Details Controlled release system Controlled release system

1984-09-06

1989-09-12

Griffin, Ronald W.

Drug, bio-affecting and body treating compositions

Designated inorganic nonactive ingredient or elemental...

Siliceous or calcareous material

514964, 514965, 71 1, A61M 3100

Patent

active

048660973

ABSTRACT:
A device for the controlled release of an active material into an aqueous medium comprises a water soluble capillary tube (11) the bore (12) of which contains an active material (13). Dissolution of the active material is diffusion limited during a delay period while the capillary is dissolving. When dissolution of the tube is complete rapid dissolution of the remaining active material then takes place.

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patent: 3962414 (1976-06-01), Michaels
patent: 4014675 (1977-03-01), Osburn
patent: 4203442 (1980-05-01), Michaels
patent: 4449981 (1984-05-01), Drake et al.

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