Regional oximetry analog front end
First Claim
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1. An apparatus comprising:
- a first amplifier having a first input coupled to a first optical detector and having a first output corresponding to a logarithm of the first input wherein the first input corresponds to light intensity along a first optical path through a tissue, the first optical detector on the first optical path;
a second amplifier having a second input coupled to a second optical detector and having a second output corresponding to a logarithm of the second input wherein the second input corresponds to light intensity along a second optical path through the tissue, the second optical detector on the second optical path and wherein the first optical path differs from the second optical path, wherein the light intensity corresponds to concentration of an absorbing species in the tissue; and
a differential amplifier having a differential output, the differential amplifier configured to amplify a difference between the first output and the second output and generate an output signal, the output signal provided at the differential output and the output signal corresponding to oxygenation of a region of the tissue.
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Abstract
An apparatus includes a first amplifier having a first input coupled to a first optical detector. The first amplifier includes a first output corresponding to a logarithm of the first input. The apparatus includes a second amplifier having a second input coupled to a second optical detector and having a second output corresponding to a logarithm of the second input. The apparatus includes a differential amplifier configured to amplify a difference between the first output and the second output.
11 Citations
29 Claims
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1. An apparatus comprising:
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a first amplifier having a first input coupled to a first optical detector and having a first output corresponding to a logarithm of the first input wherein the first input corresponds to light intensity along a first optical path through a tissue, the first optical detector on the first optical path; a second amplifier having a second input coupled to a second optical detector and having a second output corresponding to a logarithm of the second input wherein the second input corresponds to light intensity along a second optical path through the tissue, the second optical detector on the second optical path and wherein the first optical path differs from the second optical path, wherein the light intensity corresponds to concentration of an absorbing species in the tissue; and a differential amplifier having a differential output, the differential amplifier configured to amplify a difference between the first output and the second output and generate an output signal, the output signal provided at the differential output and the output signal corresponding to oxygenation of a region of the tissue. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method comprising:
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receiving a first signal from a first optical detector, the first signal corresponding to a first optical parameter for a tissue wherein the first optical parameter corresponds to light intensity along a first optical path through the tissue; receiving a second signal from a second optical detector, the second signal corresponding to a second optical parameter for the tissue wherein the second optical parameter corresponds to light intensity along a second optical path through the tissue, wherein the first optical path differs from the second optical path, wherein the light intensity corresponds to concentration of an absorbing species in the tissue; generating a first amplified output corresponding to a logarithm of the first signal; generating a second amplified output corresponding to a logarithm of the second signal; and generating a differential output using the first amplified output and the second amplified output, wherein the differential output corresponds to oxygenation of a region of the tissue. - View Dependent Claims (17, 18, 19, 20, 21, 22)
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23. A system comprising:
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a first optical detector configured to provide a first signal corresponding to a first optical property of a tissue wherein the first optical property corresponds to light intensity along a first optical path through the tissue; a second optical detector configured to provide a second signal corresponding to a second optical property of the tissue wherein the second optical property corresponds to light intensity along a second optical path through the tissue, wherein the first optical path differs from the second optical path, wherein the light intensity corresponds to concentration of an absorbing species in the tissue; a first amplifier to generate a first output corresponding to a logarithm of the first signal; a second amplifier to generate a second output corresponding to a logarithm of the second signal; a differential amplifier configured to generate a differential output corresponding to oxygenation of a region of the tissue and based on the first output and the second output; and a display configured to provide a visible indication corresponding to the differential output. - View Dependent Claims (24, 25, 26, 27, 28, 29)
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Specification