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.
