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Electrokinetic pump designs and drug delivery systems

  • US 8,152,477 B2
  • Filed: 11/22/2006
  • Issued: 04/10/2012
  • Est. Priority Date: 11/23/2005
  • Status: Active Grant
First Claim
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1. A piston assembly, comprising:

  • a piston housing;

    a material housing within the piston housing that divides the piston housing into a first portion and a second portion, the material housing having apertures that provide fluid communication between the first portion and the second portion;

    a porous material inside of the material housing;

    a first shaft connecting the material housing to a piston head outside of the piston housing;

    a second shaft connecting the material housing to a handle outside of the piston housing; and

    a valve within the second shaft, wherein actuation of the valve provides a flow path between the first portion and the second portion, and wherein the flow path includes a bypass through the porous material contained in the material housing.

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