Patent ID: 8328757

Claim:
A bladder arrangement for an active transdermal drug delivery device, comprising: a first flexible membrane having an inner and outer surface; a bladder member including an inner surface, an outer surface and an aperture therethrough, the inner surface of the flexible membrane and the inner surface of the bladder member defining a chamber for receiving a drug therein; an array of microneedles, each microneedle having an input; a valve arrangement received within the aperture in the bladder member and communicating with the inputs of the microneedles through a passageway, the valve arrangement movable between a first configuration wherein the inputs of the microneedles are isolated from the drug in the chamber and a second configuration wherein the passageway communicates with the drug in the chamber; a pressure source engageable with the flexible membrane, the pressure source having a first retracted configuration and a second expanded configuration wherein the pressure source urges the drug from the chamber towards the passageway; and an actuator movable between a first non-actuated position and a second actuated position; wherein: the pressure source moves to the expanded configuration in response to the movement of the actuator to the actuated position; the valve arrangement moves from the first configuration to the second configuration in response to the movement of the actuator to the actuated position; and at least a portion of the bladder member defining the aperture is rigid.