Method and system for determining bilirubin concentration
First Claim
1. A method for determining a bilirubin concentration of a patient, comprising the steps of:
- a) illuminating a portion of a skin of the patient with light;
b) detecting a frequency spectrum of light scattered from the skin;
c) determining, from first and second portions of the spectrum, a first parameter indicative of a blood content of the skin and a second parameter indicative of a melanin content of the skin;
d) determining, from a third portion of the spectrum, a third parameter indicative of an uncorrected bilirubin concentration; and
e) calculating a corrected bilirubin concentration based on at least one calibration factor corresponding to at least one of the first, second, and third parameters and values consisting essentially of the first, second and third parameters.
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Accused Products
Abstract
A system and method embodying the invention can be used to detect a characteristic or condition of a patient. A method embodying the invention may include the steps of illuminating a portion of a skin of the patient with light, detecting a frequency spectrum of light scattered from the skin, determining, from first and second portions of the spectrum, a first parameter indicative of a blood content of the skin and a second parameter indicative of a melanin content of the skin, determining, from a third portion of the spectrum, a third parameter indicative of an uncorrected bilirubin concentration, and calculating a corrected bilirubin concentration based on the first, second and third parameters.
107 Citations
45 Claims
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1. A method for determining a bilirubin concentration of a patient, comprising the steps of:
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a) illuminating a portion of a skin of the patient with light;
b) detecting a frequency spectrum of light scattered from the skin;
c) determining, from first and second portions of the spectrum, a first parameter indicative of a blood content of the skin and a second parameter indicative of a melanin content of the skin;
d) determining, from a third portion of the spectrum, a third parameter indicative of an uncorrected bilirubin concentration; and
e) calculating a corrected bilirubin concentration based on at least one calibration factor corresponding to at least one of the first, second, and third parameters and values consisting essentially of the first, second and third parameters. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system for determining a bilirubin concentration in a patient, comprising:
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means for illuminating a portion of the patient'"'"'s skin with light;
means for detecting a frequency spectrum of light scattered from the skin;
means for determining, from first and second portions of the spectrum, a first parameter indicative of a blood content of the skin and a second parameter indicative of a melanin content of the skin;
means for determining, from a third portion of the spectrum, a third parameter indicative of an uncorrected bilirubin concentration; and
means for calculating a corrected bilirubin concentration based on at least one calibration factor corresponding to at least one of the first, second, and third parameters and values consisting essentially of the first, second and third parameters. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A system for measuring a bilirubin concentration of a patient by directing radiation onto a portion of a skin of the patient and analyzing scattered or reflected radiation returning from the skin, comprising:
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a radiation analyzing device for analyzing radiation scattered or reflected from the patient'"'"'s skin and for outputting radiation data;
a radiation source;
at least one radiation transmitting conduit for directing radiation from the radiation source to a portion of the patient'"'"'s skin;
at least one radiation receiving conduit for directing radiation scattered from the patient'"'"'s skin to the radiation analyzing device; and
means for calculating a bilirubin concentration of the patient based on calibrated measurements of the reflected or scattered radiation at first and second wavelength bands indicative of a blood content of the patient'"'"'s skin, and of a melanin content of the patient'"'"'s skin, respectively, and on a calibrated measurement of the reflected or scattered radiation at a third wavelength band indicative of the patient'"'"'s bilirubin concentration. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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35. A method for determining a bilirubin concentration of a patient, comprising the steps of:
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a) illuminating a portion of a skin of the patient with light;
b) detecting a frequency spectrum of light scattered from the skin;
c) determining, from first and second portions of the spectrum, a first parameter indicative of a blood content of the skin and a second parameter indicative of a melanin content of the skin;
d) determining, from a third portion of the spectrum, a third parameter indicative of an uncorrected bilirubin concentration; and
e) correcting the first, second and third parameters based on a calibration factor, and calculating a corrected bilirubin concentration based on the corrected first, second and third parameters. - View Dependent Claims (36, 37, 38, 39, 40)
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41. A system for determining a bilirubin concentration in a patient, comprising:
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means for illuminating a portion of the patient'"'"'s skin with light;
means for detecting a frequency spectrum of light scattered from the skin;
means for determining, from first and second portions of the spectrum, a first parameter indicative of a blood content of the skin and a second parameter indicative of a melanin content of the skin;
means for determining, from a third portion of the spectrum, a third parameter indicative of an uncorrected bilirubin concentration; and
means for calculating a corrected bilirubin concentration based on corrected parameters corresponding to the first, second and third parameters. - View Dependent Claims (42, 43, 44, 45)
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Specification