Patent ID: 9028467
Filing Date: 2015-05-12
Classification: A61K,A61M

Abstract:
1. An osmotic pump system comprising: a body structure configured for placement in an environment; a delivery reservoir configured to contain a delivery fluid to be delivered into the environment; an osmotic chamber; an osmotic pressure-generating material contained within the osmotic chamber, 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; a semi-permeable membrane separating the osmotic chamber from an osmotic fluid source, the semi-permeable membrane being substantially permeable by fluid from the osmotic fluid source but substantially impermeable to the osmotic pressure-generating material; and a plurality of interaction sites for the osmotic pressure-generating material within the osmotic chamber, the likelihood of interaction of the osmotic pressure-generating material with the interaction sites controllable by the electromagnetic field control signal, wherein interaction of the osmotic pressure-generating material with the interaction sites causes a change in osmotic pressure within the osmotic chamber.