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...http://www.google.com.tw/patents/US7524456?utm_source=gb-gplus-share專利 US7524456 - Diagnostic devices for the controlled movement of reagents without membranes
