Delivery device providing beneficial agent stability
US5137727A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 12, 1991 |
| Grant date | Aug 11, 1992 |
| Priority date | — |
| Expiry date | Jun 12, 2011 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61K9/0004
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
The present invention is directed to an improved fluid-imbibing dispensing device for delivering a beneficial agent to a biological environment of use, the dispensing device being of the type having a housing which includes a fluid-impermeable first wall section with an open end and a fluid-permeable second wall section with an open end, an internal compartment formed by the first and second wall sections, exit means in the housing, a beneficial agent in that portion of the compartment formed by the first wall section, expandable driving means in that portion of the compartment formed by the second wall section, and a partition layer between the beneficial agent and the expandable driving means; wherein the improvement comprises the first wall section being comprised of an extremely fluid-impermeable material and the open end of each of the first wall section and the second wall section having reciprocally tapered edges one with the other to form a tapered lap joint for mating engagement, the tapered lap joints being bonded together with a pressure-sensitive contact adhesive to form the housing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.