Method and device for transdermal electrotransport delivery of fentanyl and sufentanil
US6881208B1 · kind B1 · utility
Inventors
Key dates
| Filing date | Jun 5, 1995 |
| Grant date | Apr 19, 2005 |
| Priority date | — |
| Expiry date | Jun 5, 2015 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61P25/04
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
The invention provides an improved electrotransport drug delivery system for analgesic drugs, namely fentanyl and sufentanil. The fentanyl/sufentanil is provided as a water soluble salt (eg, fentanyl hydrochloride) dispersed in a hydrogel formulation for use in an electrotransport device (10). In accordance with one aspect of the invention, the concentration of fentanyl/sufentanil in the donor reservoir (26) solution is above a predetermined minimum concentration, whereby the transdermal electrotransport flux of fentanyl/sufentanil is maintained independent of the concentration of fentanyl/sufentanil in solution. In accordance with a second aspect of the present invention, the donor reservoir (26) of the electrotransport delivery device (10) is comprised of silver and the donor reservoir (26) contains a predetermined “excess” loading of fentanyl/sufentanil halide to prevent silver ion migration with attendant skin discoloration. In accordance with a third aspect of the present invention, a transdermal electrotransport delivered dose of fentanyl/sufentanil is provided which is sufficient to induce analgesia in (eg, adult) human patients suffering from moderate-to-severe pain associa…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.