Cerebral oxygenation monitor
First Claim
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1. A method of measuring a hemoglobin parameter comprising the steps of:
- a) projecting an amount of laser light into a skull of an intrauterine infant at a first frequency via a light source positioned on a flexible circuit capable of conforming to the skull;
b) detecting the light projected into the skull at the first frequency via a detector positioned on a flexible circuit capable of conforming to the skull;
c) projecting an amount of laser light into the skull at a second frequency;
d) detecting the light projected into the skull at the second frequency; and
e) calculating Hb and HbO2 based upon the detecting steps (b) and (d);
wherein the projecting steps (a) and (c) use an array of VCSELs;
f) projecting an amount of laser light into the skull at a third frequency;
g) detecting the light projected into the skull at the third frequency;
h) projecting an amount of laser light into the skull at a fourth frequency;
i) detecting the light projected through the skull at the fourth frequency;
j) calculating Hb and HbO2 based upon the detecting steps (g) and (i); and
k) calculating a parameter based upon averaging the results of steps (e) and (j).
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Abstract
A method and apparatus for determining oxygenation and hemoglobin parameters in tissue measures light scattering parameters of light directed through the tissue, using an array of VCSELs, for light directed at more than one frequency. This allows for the calculation of Hb, HbO2, and other parameters.
158 Citations
7 Claims
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1. A method of measuring a hemoglobin parameter comprising the steps of:
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a) projecting an amount of laser light into a skull of an intrauterine infant at a first frequency via a light source positioned on a flexible circuit capable of conforming to the skull;
b) detecting the light projected into the skull at the first frequency via a detector positioned on a flexible circuit capable of conforming to the skull;
c) projecting an amount of laser light into the skull at a second frequency;
d) detecting the light projected into the skull at the second frequency; and
e) calculating Hb and HbO2 based upon the detecting steps (b) and (d);
wherein the projecting steps (a) and (c) use an array of VCSELs;
f) projecting an amount of laser light into the skull at a third frequency;
g) detecting the light projected into the skull at the third frequency;
h) projecting an amount of laser light into the skull at a fourth frequency;
i) detecting the light projected through the skull at the fourth frequency;
j) calculating Hb and HbO2 based upon the detecting steps (g) and (i); and
k) calculating a parameter based upon averaging the results of steps (e) and (j). - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification