Test device including flow control means

  • US 5,185,127 A
  • Filed: 03/24/1992
  • Issued: 02/09/1993
  • Est. Priority Date: 09/21/1989
  • Status: Expired due to Fees
First Claim
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1. A device for assay of an analyte comprising an enclosure and a filter stack therein, said filter stack comprising:

  • a) a porous hydrophilic membrane having a first surface and a second surface, said hydrophilic membrane having thereon a binder for an analyte;

    b) a porous hydrophobic membrane having a first surface and a second surface, said first surface being in contact with said second surface of said hydrophilic membrane, said hydrophobic membrane being impermeable to an aqueous fluid and permeable to a solution of a wetting agent and an aqueous fluid; and

    c) an absorbent material in contact with said second surface of said hydrophobic membrane such that said hydrophilic membrane, said hydrophobic membrane and said absorbent material are in fluid communication when said hydrophobic membrane is permeable.said enclosure including an opening providing access to the first surface of said hydrophilic membrane.

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