Disposable immunoassay sample-collector and chromatographic-testing device
View Patent ↗A disposable liquid specimen collector and testing device can be manipulated to distribute a quantified portion of a liquid specimen to separate chromatographic strip-mounting testing stations while shielding the remainder of the specimen from cross-contamination by the immunoassay reagents present in the testing strips. In the resting state, the device exposes the testing station to a desiccant. A separate test station provides for a quick revelation of any adulterating component in the sample specimen. The geometry of the test station and fluid distribution channels assures isobaric conditions throughout the testing areas.
1. An apparatus for exposing a metered amount of liquid specimen to immunochromatographic test strips, which comprises:
a base pan;
a fluid specimen collecting vessel held above said pan;
said vessel including a vertical wall and a bottom piece having an aperture;
a distribution valve mounted between said vessel and pan, said valve having a first cavity and being shaped and dimensioned to, in a first position, admit a metered sampling of fluid from said vessel through said aperture into said first cavity, and, in a second position, dump said sampling into said pan;
a pair of test stations each shaped and dimensioned to hold a chromatographic test device above a portion of said pan and in contact with said sampling;
wherein said pan comprises a liquid-receiving section under said valve, said section being divided into symmetrical portions each having one of first and second passageways,
said portions being shaped and positioned to accept isovolumetric amounts of said sampling fluid through said aperture when said valve is placed in said second position;
said valve further comprises a second cavity containing a desiccant compound, said second cavity having an opening positioned for exposing said pan to said desiccant compound when said valve is placed in said first position.
2. The apparatus of claim 1 which further comprises a control station shaped and positioned to hold a chromatographic device above a portion of said pan and in contact with said sampling, said control station having two symmetrical channels, a first one of said channels leading to said first one passageway and a second one of said channels leading to said second passageway.
3. The apparatus of claim 1 , wherein said valve comprises:
a cylindrical body having an axis oriented horizontally under a median portion of said vessel;
said cylindrical body having said first cavity shaped and positioned to admit said sampling through said aperture when said valve is in said first position;
means for rotating said cylindrical body about said axis to expose said first cavity to said pan through said aperture when the valve is in said second position.
4. The apparatus of claim 3 , wherein said second cavity is axially distant and diametrically opposite said first cavity.
5. The apparatus of claim 1 which further comprises means for maintaining said sampling into said chamber under isobaric condition.