
US Patent No: 5,770,454
Number of patents in Portfolio can not be more than 2000
Method and aparatus for determining an analyte in a biological sample
Stats
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Jun 23, 1998
Issued date -
Nov 7, 1996
filing date -
08/737,135
serial no -
Expired
status
Importance
Abstract
A method and apparatus for analytical determination of a concentration of an analyte in a biological sample include a series of hardware elements and method steps which perform at least two detection measurements, with each detection measurement including the step of irradiating light at an irradiation site as primary light into the biological sample through a boundary surface. The light is propagated along a light path, and light is detected as it emerges from the biological sample as secondary light through a detection site. The irradiation site and detection site are separated by a measuring distance. At least two detection measurements are performed with at least two different measurement light paths between the irradiation site and the detection site. Each of the detection measurements is a frequency-domain spectroscopic measurement which is performed at at least two different wavelengths of light, and includes a comparison of a phase shift of the secondary light with the primary light as a first measurement variable, and an intensity of the secondary light as a second measurement variable. The method also includes the steps of determining the analyte concentration based upon the first and second measurement variables.
First Claim
Related Publications
International Classification(s)
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Cited Art
| Patent Info | (Count) | # Cites | Year |
|---|---|---|---|
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| 5,441,054 Apparatus for measuring absorption information in scattering medium and method therefor | 38 | 1993 | |
| 5,477,051 Apparatus for measuring optical information in scattering medium and method therefor | 32 | 1993 | |
| 5,517,987 Method for measuring internal information in scattering medium and apparatus for the same | 44 | 1994 | |
| 5,529,065 Method for measuring scattering medium and apparatus for the same | 30 | 1994 | |
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| 5,551,422 Method and apparatus for analytical determination of glucose in a biological matrix | 110 | 1994 | |
| 5,507,288 Analytical system for monitoring a substance to be analyzed in patient-blood | 533 | 1995 | |
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| 4,972,331 Phase modulated spectrophotometry | 150 | 1989 | |
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| 5,497,769 Photosensor with multiple light sources | 49 | 1993 | |
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| 5,137,355 Method of imaging a random medium | 65 | 1989 | |
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| 5,277,181 Noninvasive measurement of hematocrit and hemoglobin content by differential optical analysis | 206 | 1991 | |