Glucose measurement using a current source

Patent metadata

Field	Value
Publication number	US-9028661-B2
Application number	US-201113329628-A
Country	US
Kind code	B2
Filing date	Dec 19, 2011
Priority date	Jan 5, 2011
Publication date	May 12, 2015
Grant date	May 12, 2015

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, I, 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.

First claim

What is claimed is:

1. A method for measuring glucose in a blood sample, said method comprising the steps of:
a) connecting a constant current source having a constant current value to a blood sample test strip;
b) introducing a blood sample onto the blood sample test strip;
c) reacting the blood sample with an enzyme in the blood sample test strip to produce a charge, Q, on the blood sample test strip;
d) measuring a voltage on the blood sample test strip in determining a v…

Assignees

• Bartling James E
• Mach Aaron Joel
• Wenn Darren Edward Noel
• Microchip Tech Inc

Inventors

• Bartling James E
• Mach Aaron Joel
• Wenn Darren Edward Noel

Classifications

• G01N27/3273 Primary

  Physics · mapped topic

• G01N33/49 Primary

  Physics · mapped topic

• G01N27/327

  Physics · mapped topic