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Apparatus and process for simplified measurement

  • US 5,552,276 A
  • Filed: 03/09/1994
  • Issued: 09/03/1996
  • Est. Priority Date: 03/18/1993
  • Status: Expired due to Fees
First Claim
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1. A simplified measuring apparatus for use in a binding assay to determine the presence or amount of an analyte in a fluid test sample through the use of a label capable of producing a detectable response, said apparatus comprising:

  • (a) a porous body having releasably attached thereto an agent soluble in said test sample;

    (b) a liquid permeable porous reaction membrane disposed below said porous body having defined thereon at least one reaction area, said reaction area having immobilized thereon an affinity substance capable of directly or indirectly capturing the analyte or an agent soluble in said test sample to thereby produce the detectable response;

    (c) an absorption member disposed below said liquid permeable porous membrane having an opening being positioned below the reaction area of said liquid permeable porous membrane to define a reaction solution storing space within the opening, said absorption member being, arranged so as to contact only a peripheral area of said liquid permeable porous membrane via an intervening liquid impermeable sheet;

    (d) a liquid impermeable transparent cover disposed below said opening of said absorption member; and

    (e) a liquid impermeable case accommodating said members (a), (b), (c) and (d) having a top surface adjacent said porous body and a bottom surface adjacent said transparent cover, said top surface having defined therein a top opening for introducing said fluid test sample, and said bottom surface having defined therein a bottom opening for observation of said detectable response.

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