Dual path immunoassay device
First Claim
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1. A test device for use with a solution and for use with a conjugate having a marker, the test device for determining the presence of a ligand in a liquid sample, the test device comprising:
- a) a first sorbent strip having a first length and a first width, said first length being substantially larger than said first width, and having a first location for receiving the solution and defining a first migration path for the solution and the conjugate;
b) a second sorbent strip having a second length and a second width, said second length being substantially larger than said second width, said second sorbent strip distinct from said first sorbent strip having a second location for receiving the liquid sample and defining a second migration path for the sample distinct from said first migration path; and
c) a test site located on or in at least one of said first sorbent strip or said second sorbent strip, said test site having an immobilized ligand-binding mechanism, said first and second sorbent strips touching each other at the test site, and said second migration path extending laterally from said second location to at least said test site such that application of the liquid sample to the second location requires time for the liquid sample to laterally flow to the test site and does not immediately wet the test site upon application.
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Abstract
The systems of the invention include test cells with a first sorbent material defining a first flow path for a solution, a second sorbent material defining a second flow path distinct from the first flow path for a sample, and a test line or test site with immobilized antigens or antibodies or other ligand binding molecules such as aptamers, nucleic acids, etc. located at the junction of the first and second sorbent materials. The first and second sorbent strips touch each other at the test site location.
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Citations
26 Claims
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1. A test device for use with a solution and for use with a conjugate having a marker, the test device for determining the presence of a ligand in a liquid sample, the test device comprising:
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a) a first sorbent strip having a first length and a first width, said first length being substantially larger than said first width, and having a first location for receiving the solution and defining a first migration path for the solution and the conjugate; b) a second sorbent strip having a second length and a second width, said second length being substantially larger than said second width, said second sorbent strip distinct from said first sorbent strip having a second location for receiving the liquid sample and defining a second migration path for the sample distinct from said first migration path; and c) a test site located on or in at least one of said first sorbent strip or said second sorbent strip, said test site having an immobilized ligand-binding mechanism, said first and second sorbent strips touching each other at the test site, and said second migration path extending laterally from said second location to at least said test site such that application of the liquid sample to the second location requires time for the liquid sample to laterally flow to the test site and does not immediately wet the test site upon application. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A test device for use with a solution and for use with a conjugate having a marker, the test device for determining the presence of a ligand in a liquid sample, the test device comprising:
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a) a first sorbent strip having a first length and a first width, said first length being substantially larger than said first width, and having a first location for receiving a solution and defining a first migration path for the solution and the conjugate; b) a second sorbent strip having a second length and a second width, said second length being substantially larger than said second width, said second sorbent strip distinct from said first sorbent strip having a second location for receiving the liquid sample and defining a second migration path for the sample distinct from said first migration path; and c) a test site located on or in at least one of said first or second sorbent strips, said test site having a test line containing an immobilized ligand-binding mechanism deposited on or in the at least one of said first or second sorbent strips, said first and second sorbent strips in direct contact with each other at the test line and said second migration path extending laterally from said second location to at least said test site such that application of the liquid sample to the second location requires time for the liquid sample to laterally flow to the test site and does not immediately wet the test site upon application.
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26. A test device for use with a solution and for use with a conjugate having a marker, the test device for determining the presence of a ligand in a liquid sample, the test device comprising:
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a) a first sorbent nitrocellulose strip of a first pore size and having a first length and a first width, said first length being substantially larger than said first width, and having a first location for receiving the solution and defining a first migration path for the solution and the conjugate; b) a second sorbent nitrocellulose strip distinct from said first sorbent strip having a second pore size larger than said first pore size and a second length and a second width, said second length being substantially larger than said second width, and having a second location for receiving the liquid sample and defining a second migration path for the sample distinct from said first migration path; and c) a test site located on or in at least one of said first sorbent strip or said second sorbent strip, said test site having an immobilized ligand-binding mechanism, and said first and second sorbent nitrocellulose strips touching each other at the test site, whereby the liquid sample, after being received at the second location migrates does not immediately wet said test site, but laterally over time on said second migration path to said test site and thereafter, migration of the liquid sample on said first migration path is relatively limited due to said first pore size being smaller than said second pore size.
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Specification