Patent ID: 6385488
Filing Date: 2002-05-07
Classification: A61N

Abstract:
An iontophoretic drug delivery device comprising a controller, a high voltage supply, and a patch for delivering drugs electrically connected therebetween, the controller having a circuit comprising:a microprocessor selectively switchable between an operational state and a reset state for controlling delivery of current to the patch according to preprogrammed software instructions in said operational state, said microprocessor having an output line, said output line being set low in the operational state and set high in the reset state; a crystal oscillator connected to the microprocessor to clock the microprocessor; a transistor, a gate of which being connected to the output line, wherein current delivery to the patch is allowed to occur when the output line is low and the transistor is turned off, and current delivery is stopped when the output line is high and the transistor is turned on, wherein the microprocessor includes a watchdog timer which switches the microprocessor from the operational state to the reset state, thereby causing current delivery to be stopped by the transistor.