Delivery system comprising means for controlling internal pressure
US5474785A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 15, 1993 |
| Grant date | Dec 12, 1995 |
| Priority date | — |
| Expiry date | Jul 15, 2013 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61K9/0004
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
The present invention is directed to an improvement in a delivery system, the system comprising a wall that surrounds an internal lumen or compartment which contains a thermo-responsive beneficial agent formulation, an expandable driving member and an optional density member, and having an exit opening, and wherein the improvement comprises a) a viscosity-inducing amount of an inert viscosity-inducing agent in the thermo-responsive beneficial agent composition for increasing the viscosity of the beneficial agent composition, and/or b) a pressure-inducing exit member in the exit opening in the wall for increasing the pressure inside the lumen.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.