System and method for quality assurance of a biosensor test strip
View Patent ↗The present invention provides a test strip for measuring a signal of interest in a biological fluid when the test strip is mated to an appropriate test meter, wherein the test strip and the test meter include structures to verify the integrity of the test strip traces, to measure the parasitic resistance of the test strip traces, and to provide compensation in the voltage applied to the test strip to account for parasitic resistive losses in the test strip traces.
1. A biosensor system, comprising:
a biosensor test strip, comprising
a first measurement electrode;
a first conductive trace operatively coupled to the first measurement electrode;
a second conductive trace operatively coupled to the first measurement electrode;
a second measurement electrode;
a third conductive trace operatively coupled to the second measurement electrode;
a fourth conductive trace operatively coupled to the second measurement electrode;
a test meter coupled to the biosensor test strip, the test meter comprising:
a difference amplifier having first and second difference amplifier inputs and a difference amplifier output, wherein the first difference amplifier input is operatively coupled to the second conductive trace and the second difference amplifier input is operatively coupled to the fourth conductive trace;
a reference voltage source; and
a voltage follower amplifier having first and second voltage follower inputs and a voltage follower output, wherein the first voltage follower input is coupled to the reference voltage source, the second voltage follower input is coupled to the difference amplifier output, and the voltage follower output is coupled to the third conductive trace.