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Bladder arrangement for microneedle-based drug delivery device

  • US 8,328,757 B2
  • Filed: 01/08/2010
  • Issued: 12/11/2012
  • Est. Priority Date: 01/08/2010
  • Status: Active Grant
First Claim
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1. 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.

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