Analyte Concentration Measurement Device
First Claim
1. Analyte concentration measurement apparatus comprising:
- a housing enclosing a sample chamber configured for holding a body fluid sample;
an emitter that emits light along an optical path into the sample chamber;
a detector positioned along the optical path across the sample chamber from the emitter that detects emitted light intensity;
a first optical filter with light absorption by an analyte and water;
a second optical filter with light absorption to water alone;
a switch that alternately interposes the first optical filter and the second optical filter into the optical path; and
a logic that determines the analyte concentration based on a ratio of intensities detected with the first optical filter and the second optical filter interposed into the optical path.
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Accused Products
Abstract
A method for measuring concentration of an analyte in body fluid comprises acquiring a body fluid sample, emitting light into the body fluid sample, and detecting emitted light intensity on a plurality of optical paths through the body fluid sample. A plurality of optical filters are arranged in respective optical paths of the optical path plurality comprising at least a first optical filter with light absorption by an analyte and water and a second optical filter with light absorption to water alone. Light intensity passed through the first optical filter and passed through the second optical filter is measured and analyte concentration is determined based on a ratio of intensities detected at a detector in an optical path intersected by the first optical filter and detected at a detector in an optical path intersected by the second optical filter.
37 Citations
29 Claims
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1. Analyte concentration measurement apparatus comprising:
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a housing enclosing a sample chamber configured for holding a body fluid sample; an emitter that emits light along an optical path into the sample chamber; a detector positioned along the optical path across the sample chamber from the emitter that detects emitted light intensity; a first optical filter with light absorption by an analyte and water; a second optical filter with light absorption to water alone; a switch that alternately interposes the first optical filter and the second optical filter into the optical path; and a logic that determines the analyte concentration based on a ratio of intensities detected with the first optical filter and the second optical filter interposed into the optical path. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for measuring concentration of an analyte in body fluid comprising:
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acquiring a body fluid sample; emitting light along an optical path into the body fluid sample; detecting emitted light intensity on the optical path through the body fluid sample; positioning a first optical filter with light absorption by an analyte and water in the optical path; measuring the detected light intensity passed through the first optical filter; replacing the first optical filter with a second optical filter with light absorption to water alone; measuring the detected light intensity passed through the second optical filter; determining analyte concentration based on a ratio of intensities detected with the first optical filter and the second optical filter interposed into the optical path. - View Dependent Claims (12, 13, 14, 15)
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16. Analyte concentration measurement apparatus comprising:
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a housing enclosing a sample chamber configured for holding a body fluid sample; an emitter that emits light into the sample chamber; a plurality of detectors positioned along optical paths across the sample chamber from the emitter that detect emitted light intensity; a plurality of optical filters aligned in respective optical paths of the detector plurality comprising at least a first optical filter with light absorption by an analyte and water and a second optical filter with light absorption to water alone; and a logic that determines the analyte concentration based on a ratio of intensities detected at a first detector in an optical path intersected by the first optical filter and detected at a second detector in an optical path intersected by the second optical filter. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24)
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25. A method for measuring concentration of an analyte in body fluid comprising:
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acquiring a body fluid sample; emitting light into the body fluid sample; detecting emitted light intensity on a plurality of optical paths through the body fluid sample; arranging a plurality of optical filters in respective optical paths of the optical path plurality comprising at least a first optical filter with light absorption by an analyte and water and a second optical filter with light absorption to water alone; measuring the detected light intensity passed through the first optical filter; measuring the detected light intensity passed through the second optical filter; determining analyte concentration based on a ratio of intensities detected at a detector in an optical path intersected by the first optical filter and detected at a detector in an optical path intersected by the second optical filter. - View Dependent Claims (26, 27, 28, 29)
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Specification