Methods and systems for monitoring and controlling fluid flow rates in microfluidic systems

  • US 6,001,231 A
  • Filed: 07/15/1997
  • Issued: 12/14/1999
  • Est. Priority Date: 07/15/1997
  • Status: Expired due to Term
First Claim
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1. A method of monitoring an electroosmotic flow rate of fluid in a microfluidic device having at least first and second intersecting microscale channels disposed therein, the method comprising:

  • flowing a first fluid along the first channel by applying a voltage gradient across a length of the first channel;

    injecting a detectable amount of a signaling compound into the first channel;

    determining the flow rate of the first fluid in the first channel from the rate at which the signaling compound flows from a first point in the first channel to a second point in the first channel;

    while the first fluid is disposed in the first channel, flowing a second fluid different from the first fluid along the second channel by applying a voltage gradient across a length of the second channel;

    injecting a detectable amount of a signaling compound into the second channel; and

    determining the flow rate of the second fluid in the second channel from the rate at which the signaling compound flows from a first point in the second channel to a second point in the second channel.

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