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Apparatus for manipulating, modifying and characterizing particles in a micro channel

  • US 9,995,668 B2
  • Filed: 02/01/2007
  • Issued: 06/12/2018
  • Est. Priority Date: 02/01/2006
  • Status: Active Grant
First Claim
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1. An impedance measurement device for measuring an impedance of flowing particles by an electric field, comprising:

  • a channel for conducting a liquid with the flowing particles;

    a first electrode chamber, and a first solid state electrode located inside the first electrode chamber such that a first cavity is formed between the first solid state electrode and walls of the first electrode chamber;

    a second electrode chamber, and a second solid state electrode located inside the second electrode chamber such that a second cavity is formed between the second solid state electrode and walls of the second electrode chamber, the first and the second solid state electrodes are configured to generate the electric field for the impedance measurement of the flowing particles;

    a first conduit providing a fluid communication between the first cavity of the first electrode chamber and the channel so that the liquid from the channel can contact the first solid state electrode via the first conduit and the first cavity;

    a second conduit providing a fluid communication between the second cavity of the second electrode chamber and the channel so that the liquid from the channel can contact the second solid state electrode via the second conduit and the second cavity; and

    an electric connection from at least one of the first and the second solid state electrodes, the electric connection connected to a measurement instrument for the impedance measurement,wherein at least one of the first and the second solid state electrode has a tapered shape that becomes narrower towards the channel, an end of the tapered shape facing the channel forming a surface that is parallel to the channel, and the parallel surface is not located inside the channel.

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