Microsealed pharmaceutical delivery device
US4053580A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 20, 1976 |
| Grant date | Oct 11, 1977 |
| Priority date | — |
| Expiry date | Sep 20, 1996 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61K9/2036
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
The present invention is concerned with a pharmaceutical delivery device comprising a biologically acceptable silicone polymer matrix having microsealed compartments of 10-200 microns throughout, wherein the microsealed compartments contain a pharmaceutical in a hydrophilic solvent system. The biologically acceptable silicone polymer matrix is formed by in situ cross linking of a liquid, biologically acceptable silicone polymer in an emulsion of pharmaceutical in the hydrophilic solvent system and liquid biologically acceptable silicone polymer. The biologically acceptable silicone polymer matrix is placed in a sealed or unsealed biologically acceptable polymer container. The rate of release of pharmaceutical is controlled by altering the solubility characteristics of the hydrophilic solvent system and/or the biologically acceptable polymer matrix, the rate of release being independent of the time when the ratio of the partition coefficient of the pharmaceutical between the hydrophilic solvent system and biologically acceptable silicone polymer matrix to the solubility of the pharmaceutical in the hydrophilic solvent system is between 1 and 10.sup.-4 ml/mcg.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.