Visual blood glucose test strip
First Claim
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1. A method for measuring a concentration of glucose in a sample of whole blood, comprising the steps ofa) providing a test strip that comprises (i) a two-sided spreading layer for accepting the blood sample on a first side and passing the sample to a second side, opposite:
- (ii) an intermediate layer comprising first and second membranes, substantially side-by-side, each having a top major surface adjoining the second side of the spreading layer to receive a part of the blood sample and each containing a reagent that can react with glucose in the sample, as it passes through the membrane, to cause a color change in the reagent, the second membrane further comprising an inhibitor and an inert dye, and (iii) a support layer to support the other layers and to permit any color changes in the membranes to be visible through it b) applying the blood sample to the spreading layer of the test strip, and c) determining the glucose concentration by comparing the colors of the first and second membranes with a calibration color chart.
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Abstract
A visual blood glucose test strip has two membranes that each incorporate a reagent that reacts with glucose in a blood sample applied to the membranes to cause a color change. One of the membranes also includes an inhibitor and a dye. A blood sample applied to the strip causes the two membranes to form two different colors. Comparing the colors to a calibrated color chart permits a user to determine the glucose concentration in the blood sample.
203 Citations
1 Claim
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1. A method for measuring a concentration of glucose in a sample of whole blood, comprising the steps of
a) providing a test strip that comprises (i) a two-sided spreading layer for accepting the blood sample on a first side and passing the sample to a second side, opposite: -
(ii) an intermediate layer comprising first and second membranes, substantially side-by-side, each having a top major surface adjoining the second side of the spreading layer to receive a part of the blood sample and each containing a reagent that can react with glucose in the sample, as it passes through the membrane, to cause a color change in the reagent, the second membrane further comprising an inhibitor and an inert dye, and (iii) a support layer to support the other layers and to permit any color changes in the membranes to be visible through it b) applying the blood sample to the spreading layer of the test strip, and c) determining the glucose concentration by comparing the colors of the first and second membranes with a calibration color chart.
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Specification
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Current AssigneeCilag Gmbh International (Johnson & Johnson)
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Original AssigneeLifescan Incorporated (Duv Holding Corporation)
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InventorsJurik, Franklin A., Chang, Carol, Stubbs, Andrea, Dao, Mimi Diemmy
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Primary Examiner(s)Warden, Jill
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Assistant Examiner(s)SIEFKE, SAMUEL P
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Application NumberUS09/724,142Time in Patent Office834 DaysField of Search422/56, 422/58, 422/57, 436/170, 436/95, 436/169US Class Current436/95CPC Class CodesG01N 33/523 the element being adapted f...G01N 33/66 involving blood sugars, e.g...Y10T 436/144444 Glucose
