Method for measuring analyte concentration in a liquid sample
First Claim
1. A method, comprising:
- analyzing glucose concentration in a body fluid received in a biosensor through differential pulse voltammetry, wherein the biosensor at least includes a reagent covering a working electrode, said analyzing includingapplying short, high frequency voltage pulses to the body fluid in the biosensor to keep a diffusion layer within the reagent of the working electrode, wherein the voltage of the pulses are incrementally increased,determining the glucose concentration of the body fluid based only on a response to the pulses within a voltage window that is less than a voltage where a peak, diffusion-limited current occurs, andoutputting glucose concentration results from said determining.
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Abstract
The blood glucose analysis technique and system described herein address the issue of hematocrit interference when rapidly detecting glucose concentrations. It addresses this issue by using a differential pulse voltammetry technique in which short high, frequency voltage pulses are applied to keep the diffusion layer within the reagent of the working electrode, and the pulses are applied in a limited voltage window (or range) that is below the peak, diffusion-limited current. The readings below the peak are then used to determine glucose concentrations. With this technique, glucose concentrations can be determined relatively fast (e.g., within 5 seconds) and independently of the hematocrit levels of the fluid being analyzed.
19 Citations
25 Claims
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1. A method, comprising:
analyzing glucose concentration in a body fluid received in a biosensor through differential pulse voltammetry, wherein the biosensor at least includes a reagent covering a working electrode, said analyzing including applying short, high frequency voltage pulses to the body fluid in the biosensor to keep a diffusion layer within the reagent of the working electrode, wherein the voltage of the pulses are incrementally increased, determining the glucose concentration of the body fluid based only on a response to the pulses within a voltage window that is less than a voltage where a peak, diffusion-limited current occurs, and outputting glucose concentration results from said determining. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 25)
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16. A method, comprising:
analyzing glucose concentration in a body fluid with differential pulse voltammetry, wherein said analyzing includes applying one or more pulses to the body fluid in a voltage window that is less than a voltage where a peak, diffusion-limited current occurs, and determining the glucose concentration based only on a response to the pulses in the voltage window. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24)
Specification