System and method for detecting used and dried sensors
AssigneeBayer HealthCare LLC
InventorBern Harrison
Life of this patent
Estimating the term…
Abstract
Systems and methods for detecting dried test strips are provided, where a dried test strip may be one that has been re-inoculated with a biological sample after having already been previously inoculated with another sample at an earlier time (e.g., hours or days before). In various aspects, a biosensor such as an amperometric glucose biosensor (“meter”) may apply one or more input electrical signals to an inoculated test strip having at least a pair of electrodes in contact with the biological sample. The meter may measure output current value(s) resulting in response to the input electrical signals applied to the test strip. The meter may determine whether the test strip is a dried test strip by comparing a ratio of the measured output current value(s) with a boundary ratio value.
Claims20
A method of analyzing a test strip in a biosensor, the method comprising:
- displaying a procedural message to apply a liquid sample to a test strip, the test strip having a dry reagent, a working electrode, a counter electrode, a detection electrode, and a bare electrode that is not in contact with the dry reagent in an unused condition of the test strip;
- applying a first voltage between the working electrode and the counter electrode;
- measuring a first current between the working electrode and the counter electrode;
- determining an amount of an analyte based on the measured first current;
- applying a second voltage between the bare electrode and the working electrode after the applying the first voltage;
- measuring a second current and thereafter a third current between the bare electrode and the working electrode;
- and at least one of:
- displaying a first error message and inhibiting a display of the determined amount of the analyte in response to a calculation based on the second and third measured currents being below a first threshold;
- and
- displaying the determined amount of analyte in response to the calculation being above the first threshold.
A biosensor comprising:
- a processor;
- a memory storing one or more executable instructions, the instructions, when executed by the processor, configuring the processor to:
- apply a first voltage between the working electrode and the counter electrode;
- measure a first current between the working electrode and the counter electrode;
- determine an amount of an analyte based on the measured first current;
- apply a second voltage between the bare electrode and the working electrode after applying the first voltage;
- measure a second current and thereafter a third current between the bare electrode and the working electrode;
- and at least one of:
- display a first error message and inhibit a display of the determined amount of analyte in response to a calculation based on the second and third measured currents being below a first threshold;
- and
- display the determined amount of analyte in response to the calculation being above the first threshold.
A non-transitory computer-readable storage unit on which computer readable instructions of a program are stored, the instructions, when executed by a processor, causing the processor to:
- apply a first voltage between the working electrode and the counter electrode;
- measure a first current between the working electrode and the counter electrode;
- determine an amount of an analyte based on the measured first current;
- apply a second voltage between the bare electrode and the working electrode after applying the first voltage;
- measure a second current and thereafter a third current between the bare electrode and the working electrode;
- display a first error message and inhibit a display of the determined amount of analyte in response to a calculation based on the second and third measured currents being below a first threshold;
- and
- display the determined amount of analyte in response to the calculation being above the first threshold.
Dependencies are inferred from the claim text.