Patent ID: 8109923
Filing Date: 2012-02-07
Classification: A61K,A61M

Abstract:
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; and a 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.