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Apparatus and method for delivering beneficial liquids at steady rate

  • US 8,061,280 B2
  • Filed: 08/28/2009
  • Issued: 11/22/2011
  • Est. Priority Date: 04/10/2008
  • Status: Expired due to Fees
First Claim
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1. An apparatus to provide controlled delivery of a beneficial agent, the apparatus comprising:

  • a water chamber;

    a water-transporting membrane in communication with the water collection chamber;

    an extraction chamber to receive water through the water-transporting membrane and into the extraction chamber, thereby expanding the extraction chamber;

    an osmagent in the extraction chamber;

    a dispensing chamber containing a beneficial agent and contracting in response to expanding the extraction chamber; and

    a port in communication with the dispensing chamber to deliver the beneficial agent.

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