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Fluid delivery mechanism having a flush-back operation

  • US 6,585,499 B2
  • Filed: 08/31/2001
  • Issued: 07/01/2003
  • Est. Priority Date: 03/04/1999
  • Status: Expired due to Fees
First Claim
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1. A device for providing a flow of liquid from a source of the liquid through a tube comprising:

  • means for pinching-off a first section of the tube to define a metering chamber between the first section and a second pinched-off section of the tube downstream from the first section and the source of liquid;

    a first means for pushing a first portion of the liquid in the metering chamber of the tube in a flow direction; and

    a second means for directing a second portion of the liquid in the metering chamber through the pinched-off first section of the tube towards the source of the liquid;

    such that the tube is re-opened using the liquid pushed towards the source of the liquid and through the pinched-off section of the tube thereby improving the accuracy of the flow of the liquid.

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