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Osmotic pump with remotely controlled osmotic pressure generation

  • US 8,109,923 B2
  • Filed: 08/15/2006
  • Issued: 02/07/2012
  • Est. Priority Date: 12/13/2005
  • Status: Expired due to Fees
First Claim
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1. An osmotic pump system comprising:

  • a body structure configured for placement in an environment;

    a delivery reservoir capable of containing a delivery fluid to be delivered into the environment;

    an osmotic chamber;

    an osmotic pressure-generating material contained within the osmotic chamber;

    an electromagnetic field activated heating element capable of producing an increase in temperature in osmotic fluid within the osmotic chamber, the osmotic pressure-generating material having a solubility in the osmotic fluid that changes in response to an increase in temperature of the osmotic fluid, and the generation of osmotic pressure by the osmotic pressure-generating material controllable by an electromagnetic field control signal;

    a pressure-responsive movable barrier separating the osmotic chamber from the delivery reservoir, the pressure-responsive barrier being substantially impermeable to the osmotic pressure-generating material and configured to move in response to a change in pressure in the osmotic chamber to produce a change in at least one of pressure or volume in the delivery reservoir;

    anda semi-permeable membrane separating the osmotic chamber from the environment, the semi-permeable membrane being substantially permeable by fluid from the environment but substantially impermeable to the osmotic pressure-generating material.

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