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Capillary flow device

  • US 5,204,525 A
  • Filed: 07/19/1991
  • Issued: 04/20/1993
  • Est. Priority Date: 08/05/1985
  • Status: Expired due to Term
First Claim
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1. A quality control device for use in an analytical instrument which utilizes an analysis cartridge containing an internal chamber in which said analysis occurs, said analysis cartridge being insertable into a location in said instrument so that light generated in said instrument passes through said chamber and is detected by a light detector in said instrument, which comprises:

  • a control cartridge, wherein said control cartridge is insertable in said location;

    a liquid crystal cell located in said control cartridge so as to interpose between said light source and a light detector in said analytical instrument; and

    a polarizing filter located between said said light source and said light detector so as to allow passage or block passage of light between said light source and said light detector when voltage applied to said liquid crystal is modulated.

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