Glucose measurement using a current source

Abstract

A blood glucose meter comprises a blood sample test strip, a constant current source, a precision timer, a digital processor and memory, and an analog measurement circuit, e.g., voltage comparator, analog-to-digital converter (ADC), etc., that eliminates the complex analog front end and other related circuits of present technology glucose meters. When a blood sample is applied to the blood sample test strip a charge, Q, develops from the reaction between an enzyme in the test strip and the blood sample. The constant current source injects a constant current value, 1, into the charge, Q, on the blood sample test strip over a precisely measured time determined by when the excess charge, Q, has been removed from the test strip. The amount of charge, Q, is determined by Q = I * T, the charge, Q, is then converted into a blood glucose level for display.

Description

[0001] Related Patent Applications [0002] This application asserts that James E. Bartling, Aaron Joel Mach, and Darren Edward Noel Wenn filed January 5, 2011 Priority to commonly owned U.S. Provisional Patent Application No. 61 / 430,031, entitled "Glucose Measurement Using a Current Source," which is hereby incorporated by reference for all purposes and into this article. technical field [0003] The present invention relates to blood glucose measuring apparatus, i.e., a glucose meter for measuring glucose in a blood sample, and more particularly to the use of a controlled current source, a time measuring device and a voltage comparator or analog-to-digital converter (ADC) to determine the amount of glucose in a blood sample. Background technique [0004] For diabetics, blood sugar levels need to be monitored. Blood glucose levels are measured with the aid of a blood glucose measuring device (ie, a glucose meter). The glucose meter uses a chemical reaction to generate ...

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Problems solved by technology

This makes the glucose meter more expensive, complicated and

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