Method for uniform application of fluid into a reactive reagent area
First Claim
Patent Images
1. A microfluidic device for assaying a liquid biological sample of 10 μ
- L or less, said device including at least one space in which a reagent or conditioning agent is immobilized on a substrate, the improvement comprising a microstructure disposed in said space for directing said sample over said substrate containing said reagent in a predetermined uniform manner and purging air from said space.
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Accused Products
Abstract
Analytical results obtained with microfluidic devices are improved by providing structural features in areas containing dry supported reagents, the structural features directing the flow of a sample over the area in a predetermined uniform manner and facilitating the purging of air.
143 Citations
26 Claims
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1. A microfluidic device for assaying a liquid biological sample of 10 μ
- L or less, said device including at least one space in which a reagent or conditioning agent is immobilized on a substrate, the improvement comprising a microstructure disposed in said space for directing said sample over said substrate containing said reagent in a predetermined uniform manner and purging air from said space.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of distributing a liquid sample of 10 μ
- L or less uniformly over a reagent or conditioning agent immobilized on a substrate in a well of a microfluidic device comprising passing said sample through a microstructure, said microstructure facilitating movement of said sample in a predetermined uniform manner onto said substrate and purging air from said well.
- View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A microfluidic device for assaying a liquid biological sample of 10 μ
- L or less comprising
(a) an inlet port for receiving said sample;
(b) a capillary passageway in fluid communication with said inlet port;
(c) a metering capillary or metering well in fluid communication with the capillary passageway of (b), thereby permitting said sample to flow into said metering capillary or metering well;
(d) at least one conditioning well containing a reagent for conditioning said sample;
(e) at least one capillary passageway in fluid communication with said conditioning well of (d) and said metering capillary or metering well of (c);
(f) at least one reagent well for contacting said sample after conditioning with a reagent for assaying the amount of an analyte in said sample, said reagent well containing a reagent disposed on a substrate and microstructures for passing said sample over said substrate in a predetermined uniform manner and purging air from said well. - View Dependent Claims (18, 19, 20)
- L or less comprising
- 21. A microfluidic device for assaying a biological sample comprising an absorbent substrate strip having an inlet end and an outlet end and containing a sequence of reagents on said for reaction with said sample, wherein said sample is in contact with said inlet end of said strip and said outlet end of said strip is in contact with an absorbent material for removing liquid from said outlet end.
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24. A microfluidic device for assaying the amount of glucose in a sample of blood comprising
(a) an entry port for receiving said sample; -
(b) an inlet passageway containing ridges or grooves disposed perpendicularly to the sample flow to create a uniform liquid front, said passageway widening into a reagent chamber;
(c) said reagent chamber of (b) containing microstructures and a chromagenic glucose reagent disposed on a porous substrate; and
(d) a vent passageway in communication with said reagent chamber for venting air displaced from said reagent chamber. - View Dependent Claims (25, 26)
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Specification