Method of applying drug-release coatings
US5980972A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 22, 1997 |
| Grant date | Nov 9, 1999 |
| Priority date | — |
| Expiry date | Sep 22, 2017 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB05B13/0442
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
The invention is directed to a method of applying drug-release coatings whereby a polymer can be dissolved in a first solvent (solvent A) to form a polymer system and a drug can be dissolved or suspended in a second solvent (solvent B) to form a drug system. The coating or layer of coating so formed comprises a substantially uniform combination of the drug and polymer. Solvent B can be the same as or different than solvent A. The coating can be applied on a stent body by separately spraying or dipping the polymer system and the drug system onto the devices. The coating can be accomplished by either applying the polymer and drug systems sequentially or simultaneously. In certain embodiments, a drug can be suspended in solvent B. In some cases, three or more systems can be utilized. For instance, a third system containing pure solvent A or B can smooth the coating surface, if the solvent of the third spraying system is compatible with the polymer matrix.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.