Reservoir system for prolonged diffusion of an active principle
US5830546A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 1, 1992 |
| Grant date | Nov 3, 1998 |
| Priority date | — |
| Expiry date | Oct 1, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/1362
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
A reservoir system consisting of a nonwoven made from thermoplastic polymer filaments, shaped into a closed bag containing a water-soluble active principle. The bag is intended to ensure a prolonged release, progressing linearly, of the active principle in an aqueous environment. For a given active principle, the desired diffusion kinetics are obtained by adjusting, depending on the availability of the active principle, the surface area of the nonwoven and the degree of hydrophily of the latter. To this end, it is impregnated, either with polysiloxane or a quaternary ammonium salt, or with a perfluorinated compound or an acrylic resin and paraffin.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.