Appeal No. 98-2769 Application 08/485,960 21. An electrotransport delivery system comprising: an electrotransport device for delivering a therapeutic agent through a body surface, the device including a controller which operates at a predetermined, substantially fixed electrical output, the controller being adapted to be detachably connected to a plurality of therapeutic agent sources; and a plurality of different therapeutic agent sources in which a parameter in each said different sources has been varied so that electrotransport agent delivery rate from the system with one of said sources is substantially different from the electrotransport agent delivery rate from the system with another of said sources. 2Page: Previous 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17Last modified: November 3, 2007