Detecting incomplete fill of biosensors
First Claim
1. A method of detecting an incomplete filling of a liquid sample in an electrochemical biosensor having working and counter electrodes, the method comprising the acts of:
- (a) applying a constant electrical potential across said working and counter electrodes for a predetermined period of time;
(b) measuring the current passing between said working and counter electrodes;
(c) collecting values of the current measured in act (b) at predetermined times during said predetermined period of time of act (a);
(d) determining by linear regression the slope of a line defined by the values of current collected in act (c); and
(e) reporting as incompletely filled a biosensor exhibiting a positive slope of a line as determined in act (d).
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Abstract
A method of detecting incomplete filling of an electrochemical biosensor by collecting a series of electrical current values when a constant electrical potential is applied across the working and counter electrodes during a preliminary burn period. The slope of a line determined by linear regression based on the series of current values is used to determine whether or not the biosensor is incompletely filled. If the line has a positive slope, the biosensor is reported to be under filled. If the slope is not positive, the correlation coefficient of the current values is used as a supplemental test to indicate whether or not the biosensor is incompletely filled.
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Citations
21 Claims
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1. A method of detecting an incomplete filling of a liquid sample in an electrochemical biosensor having working and counter electrodes, the method comprising the acts of:
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(a) applying a constant electrical potential across said working and counter electrodes for a predetermined period of time; (b) measuring the current passing between said working and counter electrodes; (c) collecting values of the current measured in act (b) at predetermined times during said predetermined period of time of act (a); (d) determining by linear regression the slope of a line defined by the values of current collected in act (c); and (e) reporting as incompletely filled a biosensor exhibiting a positive slope of a line as determined in act (d). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of determining of an analyte concentration of a fluid sample, the method comprising the acts of:
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providing said fluid sample; providing an electrochemical biosensor including a working electrode, a counter electrode, and a reagent; placing said fluid sample into contact with said reagent; applying an electrical potential across said working and counter electrodes for a predetermined period of time; measuring the current passing between said working and counter electrodes; collecting values of the measured current at predetermined times during said predetermined period of time; determining by statistical methods the slope of a line defined by the collected current values; reporting a biosensor as being as incompletely filled if said biosensor exhibits a positive slope of said line defined by the collected current values; and if said biosensor is not incompletely filled, determining the analyte concentration of said fluid sample. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. A method of determining of an analyte concentration of a fluid sample, the method comprising the acts of:
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providing said fluid sample; providing an electrochemical biosensor including a first electrode, a second electrode, and a reagent; placing said fluid sample into contact with said reagent; applying a electrical potential across said first and second electrodes for a predetermined period of time; measuring the current passing between said first and second electrodes; collecting values of the measured current at predetermined times during said predetermined period of time; determining the slope of a line defined by the collected current values; reporting a biosensor as being as incompletely filled if said biosensor exhibits a positive slope of said line defined by the collected current values; and if said biosensor is not incompletely filled, determining the analyte concentration of said fluid sample. - View Dependent Claims (20, 21)
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Specification