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High pressure capillary micro-fluidic valve device and a method of fabricating same

  • US 7,204,264 B2
  • Filed: 09/15/2004
  • Issued: 04/17/2007
  • Est. Priority Date: 04/21/2004
  • Status: Active Grant
First Claim
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1. A method of micro-machining a micro-fluidic valve device comprising the steps of:

  • obtaining a planar substrate;

    performing at least a first lithographic process on said planar substrate such that a predetermined pattern is etched into said planar substrate, wherein said predetermined pattern includes a refrigerant inlet, expansion chamber and refrigerant outlet in fluid communication;

    disposing within said valve body at least one conduit proximate to said expansion chamber to facilitate communication of thermal properties of refrigerant to a fluid flowing through said at least one conduit to form a freeze-thaw region in said at least one conduit; and

    providing a mating structure over said refrigerant inlet, expansion chamber and refrigerant outlet.

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