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Fluid metering device

  • US 9,995,295 B2
  • Filed: 12/03/2008
  • Issued: 06/12/2018
  • Est. Priority Date: 12/03/2007
  • Status: Active Grant
First Claim
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1. A device for metering a fluid comprising a walled fluid chamber with at least one fluid inlet or fluid outlet port, at least one chamber wall and a movable separator that is in contact with and retains the fluid in the chamber, a porous media substrate and a wicking material, an actuator formed of a flexible polymer material in contact with the porous media substrate and with the moveable separator, an actuator hydrating solution reservoir bounded by said at least one chamber wall and a hydrating solution inlet port, in fluid contact with the porous media substrate, a fluid gate located between the actuator hydrating solution reservoir and the polymer actuator, effectively keeping the actuator dry, contained in an external shell so that the actuator is adapted to move in a direction and apply pressure to the separator in contact with the fluid in the fluid chamber, thereby dispensing fluid from the fluid chamber, wherein the actuator is formed of a material having varying layers of density and porosity or varying degrees of reacted and unreacted molecular sites.

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