HAND-HELD TEST METER WITH TIME-MULTIPLEXED PHASE DETECTION

摘要

A hand-held test meter for use with an analytical test strip in determining an analyte in a fluid sample includes a housing retaining a microcontroller block and a phase shift-measurement block. The measurement block includes a signal-generation sub-block that provides an excitation voltage signal; an interface sub-block that receives the analytical test strip and permits applying the voltage excitation signal to the test strip to provide a resultant current signal; a transimpedance conversion sub-block that receives the resultant current signal and provides a resultant voltage signal; and a phase detector responsive to the resultant voltage signal and a reference signal. The microcontroller block successively provides 0- and 900 -phase reference signals as the reference to the phase detector to measure in-phase and quadrature components and determine a phase shift corresponding to a fluid sample in the received analytical test strip. INTRODUCE FLUID SAMPLE TO ANALYTICAL TEST STRIP 720 - APPLY VOLTAGE SIGNAL ACROSS MEASURE CURRENT SUCCESSIVELY PRODUCE IN-PHASE AND QUADRATURE DETERMINE PHASE SHIFT CORRESPONDING TO FLUID SAMPLE DETERMINE HEMATOCRIT VALUE OF WHOLE BLOOD DETERMINE GLUCOSE VALUE OF WHOLE BLOOD SAMPLE USING HEMATOCRIT VALUE