Diagnostic devices for the controlled movement of reagents without membranes
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United States of America Patent
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Apr 28, 2009
Grant Date -
N/A
app pub date -
Jul 11, 2000
filing date -
May 21, 1992
priority date (Note) -
Expired
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Abstract
The assay devices, assay systems and device components of this invention comprise at least two opposing surfaces disposed a capillary distance apart, at least one of which is capable of immobilizing at least one target ligand or a conjugate in an amount related to the presence or amount of target ligand in the sample from a fluid sample in a zone for controlled fluid movement to, through or away the zone. The inventive device components may be incorporated into conventional assay devices with membranes or may be used in the inventive membrane-less devices herein described and claimed. These components include flow control elements, measurement elements, time gates, elements for the elimination of pipetting steps, and generally, elements for the controlled flow, timing, delivery, incubation, separation, washing and other steps of the assay process.
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