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Capillary flow device

  • US 5,004,923 A
  • Filed: 01/30/1990
  • Issued: 04/02/1991
  • Est. Priority Date: 08/05/1985
  • Status: Expired due to Term
First Claim
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1. A control device capable of detecting depletion of a particle-containing fluid from a sample reservoir in a device comprising a sample reservoir and a capillary exiting said reservoir, which comprises:

  • a light source located so as to impinge on said fluid in said reservoir;

    a light detector located in close proximity to said capillary so as to collect light which is reflected by said particles into said capillary and thereafter further reflected by said particles so as to pass out through the walls of said capillary;

    a signal generator operably attached to said light source, wherein a detectable signal is imposed on the output of said light source; and

    a filter operably attached to the output of said light detector, wherein said detectable signal is isolated from other light sources which may impinge upon said light detector.

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