Patent ID: 7776559

Claim:
A self-calibrating, disposable blood test device insertable in a meter, the test device comprising: a substrate configured for carrying a chemical reagent; and circuitry formed on the substrate, the circuitry comprising: a sensor portion associated with the chemical reagent to enable measurement of at least one of a presence and a concentration of a blood analyte, the sensor portion including an electrode sensor; an input/output pad connected to the electrode sensor; and an additional input/output pad connected to an information storage portion that is connected in parallel with the electrode sensor; wherein the information storage portion is configured to store information indicative of a property of the chemical reagent for calibration of the meter, the information storage portion including a plurality of impedance elements including at least one of: a plurality of inductors arranged in series; or a plurality of capacitors arranged in parallel, wherein each impedance element includes a region that may be physically altered by at least one of punching, drilling, or shorting via fusible link, to create a short circuit or open circuit, in order to activate or deactivate the impedance element wherein the information is stored by activating or deactivating a select number of the impedance elements in a determinable order, which creates a characteristic impedance between the input/output pad and the additional input/output pad that is measurable by the meter and which corresponds to at least one calibration value that is indicative of the property of the chemical reagent; and wherein the impedance elements within the information storage portion are arranged such that 2 N different potential characteristic impedances may be produced, wherein N is the number of impedance elements.