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Osmotically Driven Dispense Pump and Related Components for Use in High Pressure Applications

  • US 20080269725A1
  • Filed: 07/21/2006
  • Published: 10/30/2008
  • Est. Priority Date: 07/22/2005
  • Status: Active Grant
First Claim
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1. A high pressure osmotic dispense pump, comprising:

  • a) a semi-permeable membrane which is substantially free of distortions and lateral stretching stresses;

    b) a solvent reservoir in fluid communication with the semi-permeable membrane and including a solvent piston which is movable in response to a change in a fluid volume within the solvent reservoir;

    c) a solution reservoir in fluid communication with the semi-permeable membrane and including a delivery piston which is movable in response to a change in a fluid volume within the solution reservoir; and

    d) a fluid reservoir adjacent the delivery piston opposite the solution reservoir and being fluidly isolated from each of the solvent reservoir and solution reservoir and having an outlet for dispensing a fluid contained in the fluid reservoir.

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