Patent ID: 7147764

Claim:
A system for injecting an analyte, comprising: a first electrical circuit including a first electrode, a second electrode, and an interruptible electrical communication between the first electrode and the second electrode; a second electrical circuit including the first electrode, a third electrode, and an interruptible electrical communication between the first electrode and the third electrode; and an electrophoretic device including an electrophoretic channel, the electrophoretic channel including a sample injection end having a sample injection opening, and a second end opposite the sample injection end, wherein the second electrode is disposed along and outside the electrophoretic channel and the electrophoretic device includes at least one sidewall having an inner surface and an outer surface, the electrophoretic channel is defined at least in part by the inner surface, and the system further includes an insulator, and wherein the second electrode is disposed between the outer surface and the insulator, and the insulator is disposed between the second electrode and the first electrode, and wherein the first electrode is disposed adjacent and outside the electrophoretic channel, the second electrode is disposed adjacent the sample injection opening, and the third electrode is disposed adjacent the second end of the electrophoretic channel.