Temperature activated controlled release

Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Web – sheet or filament bases; compositions of bandages; or...

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424448, 424486, 424487, A61F 1302

Patent

active

055805736

ABSTRACT:
A polymeric device for the controlled release of active agents contained in the device in which the polymer has a glass transition temperature greater than the normal storage or non use temperature of the device. When heated to or above the glass transition temperature of the polymer, the active agent is released. The release of active agent can be switched on or off by the adjustment of the temperature of the polymeric device above or below the glass transition temperature of the polymer.

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patent: 4661104 (1987-04-01), Von Bitteva et al.
patent: 4830855 (1989-05-01), Stewart
patent: 4840796 (1989-06-01), Sweet et al.
patent: 4874119 (1989-11-01), Konner et al.
patent: 4908208 (1990-03-01), Lee et al.
patent: 4951657 (1990-08-01), Pfister et al.

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