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Laminated assay device

  • US 5,409,664 A
  • Filed: 09/28/1993
  • Issued: 04/25/1995
  • Est. Priority Date: 09/28/1993
  • Status: Expired due to Term
First Claim
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1. An assay device for performing an assay to determine an analyte in a sample, said device comprising:

  • upper and lower inert supporting films fastened at their edges, said upper film having a sample port and an air vent;

    positioned between said supporting films at least one bibulous sheet having a width extending substantially the full width of said films;

    said bibulous sheet comprising an assay strip comprising an application zone for receiving said sample and a separation zone for seperating cells from blood, a reagent zone comprising reagents of a signal producing system for producing a colored product; and

    a measurement zone comprising reagents of said signal producing system for producing a boundary whose distance along said assay strip is related to the amount of analyte in said sample, wherein at least said measurement zone extends at least a major portion of the length of said bibulous sheet and is defined by liquid impervious barriers and is of substantially narrower width than said bibulous sheet;

    wherein the absorption capacity of said assay strip determines the amount of sample which is analysed.

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