System and device for analyzing a fluidic sample
First Claim
1. A device for analyzing an analyte in a liquid sample, said device comprising,a first substrate,a second substrate,a fluidic channel,an inlet port through the second substrate, andan outlet port through the second substrate,wherein said first substrate and said second substrate each has an inner surface and an outer surface, the inner surface of the first substrate forming, at least in part, a lower wall of said fluidic channel, the inner surface of said second substrate forming, at least in part, an upper wall of said fluidic channel, said fluidic channel being connected to said inlet port and said outlet port,wherein said fluidic channel comprises a reagent region and a detection region, at least a portion of the reagent region having a coating with one or more dried reagents,wherein the outlet port forms a capillary valve having burst pressure exceeded when the device is oriented at a tilt relative to a level orientation, to break the capillary valve and drive flow of said liquid sample from the inlet port to the outlet port, andwherein said device further comprises a wicking pad configured to absorb excess liquid sample emerging from the outlet port, the wicking pad being characterized by an absorbance rate and being located on the outer surface of said second substrate at a distance from said outlet port, the absorbance rate and the distance cooperating to prevent draining the fluidic channel into the wicking pad, the outlet port and the outer surface of said second substrate between the outlet port and the wicking pad being characterized by surface tension forces that cooperate with the distance to break fluidic connection between the wicking pad and the outlet port when rate at which the liquid sample emerges from the outlet port is less than the absorbance rate, thereby preventing further fluidic flow from the outlet port to the wicking pad.
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Abstract
A device for analyzing an analyte in a sample includes a first substrate, a second substrate, a fluidic channel, an inlet port and an outlet port. Each of the first substrate and the second substrate has an inner surface and an outer surface, the inner surface of the first substrate forming, at least in part, the lower wall of the fluidic channel, and the inner surface of the second substrate forming, at least in part, the upper wall of the fluidic channel. The fluidic channel is connected to the inlet port and the outlet port. The fluidic channel includes a reagent region and a detection region, at least a portion of the reagent region being coated with one or more dried reagents. The device further includes a wicking pad located on the outer surface of the second substrate, the wicking pad being positioned at a pre-determined distance from the outlet port.
106 Citations
23 Claims
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1. A device for analyzing an analyte in a liquid sample, said device comprising,
a first substrate, a second substrate, a fluidic channel, an inlet port through the second substrate, and an outlet port through the second substrate, wherein said first substrate and said second substrate each has an inner surface and an outer surface, the inner surface of the first substrate forming, at least in part, a lower wall of said fluidic channel, the inner surface of said second substrate forming, at least in part, an upper wall of said fluidic channel, said fluidic channel being connected to said inlet port and said outlet port, wherein said fluidic channel comprises a reagent region and a detection region, at least a portion of the reagent region having a coating with one or more dried reagents, wherein the outlet port forms a capillary valve having burst pressure exceeded when the device is oriented at a tilt relative to a level orientation, to break the capillary valve and drive flow of said liquid sample from the inlet port to the outlet port, and wherein said device further comprises a wicking pad configured to absorb excess liquid sample emerging from the outlet port, the wicking pad being characterized by an absorbance rate and being located on the outer surface of said second substrate at a distance from said outlet port, the absorbance rate and the distance cooperating to prevent draining the fluidic channel into the wicking pad, the outlet port and the outer surface of said second substrate between the outlet port and the wicking pad being characterized by surface tension forces that cooperate with the distance to break fluidic connection between the wicking pad and the outlet port when rate at which the liquid sample emerges from the outlet port is less than the absorbance rate, thereby preventing further fluidic flow from the outlet port to the wicking pad.
Specification