Patent ID: 8200327

Claim:
A patient-worn device for transdermally delivering fentanyl solely by electrically induced or electrically enhanced electrotransport to a human patient suffering from pain, comprising: a donor reservoir formulation comprised of a fentanyl salt solution being the sole source of fentanyl in the device; a counter reservoir; a source of electrical power electrically connected to said reservoirs; and a control circuit for controlling electrotransport current, said control circuit including a switch which activates said device and wherein said reservoirs, said power source and said control circuit deliver solely by electrotransport a dose of about 20 μg to about 60 μg of fentanyl over a predetermined delivery period of up to about 20 minutes and terminate said delivery at the end of said delivery period, and wherein said control circuit allows up to 143 additional of said doses over a period of about 24 hours.