Glucose measurement using a current source
US9028661B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 19, 2011 |
| Grant date | May 12, 2015 |
| Priority date | — |
| Expiry date | Jan 10, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/3273
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.