Systems and methods of sample processing and fluid control in a fluidic system
First Claim
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1. A fluidic device for detecting the presence or absence of an analyte in a bodily fluid from a subject, comprising a cartridge, said cartridge comprising a sample collection unit and an assay assembly, wherein:
- (a) said sample collection unit is configured to;
(i) collect a sample of bodily fluid from said subject, and(ii) deliver a predetermined portion of said sample to said assay assembly, and wherein said sample collection unit comprises;
(1) a sample collection well in fluid communication with a metering channel, configured so that a collected sample flows from said sample collection well into said metering channel;
(2) a metering element, wherein said metering element is adapted to close the fluid communication of said sample collection well to said metering channel, thereby isolating a specific volume of said sample in said metering channel, and wherein said metering element comprises a mechanically movable portion configured to be movable from an open position that permits fluid communication between the sample collection well and the metering channel to a closed position that does not provide fluid communication between the sample collection well and the metering channel; and
(3) a dilution chamber storing a diluent and being configured to be brought into and out of fluidic communication with said metering channel, said dilution chamber being coupled to the metering channel and defining at least one portion of a pathway for delivering the diluent to said assay assembly; and
(b) said assay assembly comprises at least one reaction site containing a reactant that reacts with said analyte to yield a detectable signal indicative of the presence of said analyte.
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Abstract
This invention is in the field of medical devices. Specifically, the present invention provides portable medical devices that allow real-time detection of analytes from a biological fluid. The methods and devices are particularly useful for providing point-of-care testing for a variety of medical applications.
228 Citations
53 Claims
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1. A fluidic device for detecting the presence or absence of an analyte in a bodily fluid from a subject, comprising a cartridge, said cartridge comprising a sample collection unit and an assay assembly, wherein:
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(a) said sample collection unit is configured to; (i) collect a sample of bodily fluid from said subject, and (ii) deliver a predetermined portion of said sample to said assay assembly, and wherein said sample collection unit comprises; (1) a sample collection well in fluid communication with a metering channel, configured so that a collected sample flows from said sample collection well into said metering channel; (2) a metering element, wherein said metering element is adapted to close the fluid communication of said sample collection well to said metering channel, thereby isolating a specific volume of said sample in said metering channel, and wherein said metering element comprises a mechanically movable portion configured to be movable from an open position that permits fluid communication between the sample collection well and the metering channel to a closed position that does not provide fluid communication between the sample collection well and the metering channel; and (3) a dilution chamber storing a diluent and being configured to be brought into and out of fluidic communication with said metering channel, said dilution chamber being coupled to the metering channel and defining at least one portion of a pathway for delivering the diluent to said assay assembly; and (b) said assay assembly comprises at least one reaction site containing a reactant that reacts with said analyte to yield a detectable signal indicative of the presence of said analyte. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 17, 18, 19, 20, 21, 22, 27, 28, 29, 30, 31, 32, 33, 34, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52)
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15. A fluidic device for detecting an analyte in a bodily fluid from a subject, comprising:
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a cartridge, said cartridge comprising a sample collection unit, wherein said sample collection unit is configured to collect a sample of bodily fluid from said subject; and an assay assembly, wherein said assay assembly comprises; at least one reaction site in fluidic communication with said sample collection unit, said reaction site containing a reactant that reacts with said analyte to yield a signal indicative of the presence of said analyte; at least one reagent chamber in fluidic communication with said at least one reaction site, wherein said reagent chamber is configured to store an assay reagent; a fluidic channel connecting the reagent chamber with the reaction site; and an actuatable valve assembly configured to control the flow of reagent through said fluidic channel, wherein the valve assembly comprises a sealing element and actuator element, wherein; said channel comprises first and second locations, wherein the sealing element positioned in the first location obstructs the flow of fluid through the channel and the sealing element positioned in the second location allows the flow of fluid through the channel, providing fluidic communication between the sample collection unit and the reaction site; and
wherein the actuator element is adapted to move the sealing element from the first location to the second location; anda dilution chamber storing a diluent and being configured to be brought into and out of fluidic communication with said channel, said dilution chamber being coupled to said channel and defining at least one portion of a pathway for delivering the diluent to said assay assembly. - View Dependent Claims (16, 23, 24, 25, 26, 35, 36, 37, 53)
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Specification