Method for sensing the concentration of glucose in biological fluids
First Claim
1. A method for sensing the concentration of glucose in biological fluids comprising the steps ofapplying a variable voltage to an electrode to cause a current flow therethroughsweeping said voltage over a range in a first direction from a first limit to a second limit and in the reverse direction back toward said first limit, andintegrating current at the electrode with respect to time during a period including at least a portion of said sweep in both directions selected to produce a total charge sensitive to glucose concentration and relatively insensitive to other components in the fluid.
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Abstract
Glucose sensing apparatus for use in biological fluids comprising an electrode and a voltage source connected to the electrode to cause a current to flow therethrough, in which the voltage applied to the electrode is varied in a sweep ranging from a first limit to a second limit and back toward the first limit, and the current at the electrode is integrated with respect to time during at least a portion of the voltage variation selected to produce a total charge sensitive to glucose concentration and relatively insensitive to other components in the fluid; alternatively the current is measured at a point in a specific region of the voltage variation.
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Citations
16 Claims
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1. A method for sensing the concentration of glucose in biological fluids comprising the steps of
applying a variable voltage to an electrode to cause a current flow therethrough sweeping said voltage over a range in a first direction from a first limit to a second limit and in the reverse direction back toward said first limit, and integrating current at the electrode with respect to time during a period including at least a portion of said sweep in both directions selected to produce a total charge sensitive to glucose concentration and relatively insensitive to other components in the fluid.
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12. A method for sensing the concentration of glucose in biological fluids comprising
applying a voltage to an electrode arranged for interaction with said fluids to cause a current to flow through said electrode, sweeping said voltage in a first direction from a first limit to a second limit and thereafter in the reverse direction, said sweep including voltages between 0.2 and 0.6 volts, measuring said current at at least one isolated point, between 0.2 volts and 0.6 volts, during the anodic variation of the voltage sweep, said point being selected to be sensitive to change in levels of glucose concentration in said fluid, but relatively insensitive to levels of other constituents of said fluid, and determining the glucose concentration level based on the current measurement at said isolated point.
Specification