Patent ID: 7896868

Claim:
An osmotic pump system comprising: a delivery reservoir capable of containing a delivery fluid; an osmotic chamber; an osmotic pressure-generating material contained within the osmotic chamber; 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; at least one remotely controllable valve configured to regulate the pumping of the delivery fluid from the delivery reservoir responsive to a time-varying electromagnetic field control signal; and a fluid-handling structure located downstream of the delivery reservoir and configured to receive the delivery fluid from the delivery reservoir.