Hollow frustum reagent test device
AssigneeLifeScan, Inc.
InventorJerry Thomas Pugh
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Abstract
A hollow, frustum-shaped disposable device is used in an apparatus for measuring the concentration of an analyte in a sample of a biological fluid. The smaller end of the frustum has a porous membrane, to which a sample of the fluid may be applied. Preferably, a reagent in the membrane reacts with the analyte to cause a color change. The device is mounted on a meter, which measures the color change and computes from the change the analyte concentration in the sample. The apparatus permits remote dosing of the device, which minimizes the likelihood of cross-contamination between the user and the meter. Devices can be mounted on the meter and released from the meter without touching them, to further protect against contamination.
Claims8
A device for use in an apparatus for measuring a concentration of an analyte in a sample of a biological fluid, comprising
- (a) a hollow frustum, having open ends of unequal size, the smaller open end having an inward-extending lip, and
- (b) a porous membrane for accepting the sample, attached to raised portions of a surface of the lip and substantially closing the smaller open end, the membrane comprising
- (i) a first surface for accepting the sample and
- (ii) a reagent for reacting with the analyte to cause a color change at a second surface, opposite to the first surface, resulting in a change in reflectance at the second surface that can be measured and be related to the concentration of the analyte in the sample.
Dependencies are inferred from the claim text.