Device and method for monitoring of absolute oxygen saturation and total hemoglobin concentration
First Claim
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1. A medical device for monitoring oxygen saturation, comprising:
- a sealed housing comprising a first opening and a second opening;
a light emitting portion comprising a first lens sealed in the first opening of the housing, the light emitting portion emitting light at a plurality of wavelengths including at least four spaced apart wavelengths through the lens into a volume of a patient'"'"'s body tissue adjacent to the lens;
a light detecting portion comprising a second lens sealed in the second opening of the housing, the light detecting portion generating an electrical output signal corresponding to light incident on the light detecting portion, the incident light comprising light emitted by the emitting portion, scattered by the body tissue volume, and passing through the second lens;
a control module coupled to the light emitting portion to provide control signals controlling the light emitted by the light emitting portion; and
a monitoring module coupled to the light detecting portion to receive the output signal and to compute a volume-independent measure of oxygen saturation in the volume of tissue in response to the output signal, wherein each of the light emitting portion and the light detecting portion comprise a light source for emitting light and a light detector for detecting light and the functionality of the light emitting portion and the light detecting portion as one of emitting and detecting can be selectively switched.
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Abstract
A medical device for monitoring of oxygen saturation includes an optical sensor adapted for positioning adjacent to a tissue volume. The optical sensor has a light emitting portion capable of emitting light at a plurality of wavelengths and a light detecting portion capable of generating an electrical output signal corresponding to light incident on the detecting portion. A control module coupled to the optical sensor controls the light emitted by the light emitting portion. A monitoring module receives the output signal from the light detecting portion and computes a volume-independent measure of oxygen saturation in the volume of tissue using the output signal.
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Citations
27 Claims
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1. A medical device for monitoring oxygen saturation, comprising:
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a sealed housing comprising a first opening and a second opening; a light emitting portion comprising a first lens sealed in the first opening of the housing, the light emitting portion emitting light at a plurality of wavelengths including at least four spaced apart wavelengths through the lens into a volume of a patient'"'"'s body tissue adjacent to the lens; a light detecting portion comprising a second lens sealed in the second opening of the housing, the light detecting portion generating an electrical output signal corresponding to light incident on the light detecting portion, the incident light comprising light emitted by the emitting portion, scattered by the body tissue volume, and passing through the second lens; a control module coupled to the light emitting portion to provide control signals controlling the light emitted by the light emitting portion; and a monitoring module coupled to the light detecting portion to receive the output signal and to compute a volume-independent measure of oxygen saturation in the volume of tissue in response to the output signal, wherein each of the light emitting portion and the light detecting portion comprise a light source for emitting light and a light detector for detecting light and the functionality of the light emitting portion and the light detecting portion as one of emitting and detecting can be selectively switched. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for using a medical device comprising an optical sensor for monitoring oxygen saturation, the method comprising:
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controlling a light emitting portion of the optical sensor to emit light at a plurality of wavelengths including at least four spaced apart wavelengths into a volume of a patient'"'"'s body tissue; receiving an output signal from a light detecting portion corresponding to light incident on the light detecting portion, the incident light comprising light emitted by the emitting portion and scattered by the body tissue volume; and computing a volume-independent measure of oxygen saturation in the volume of tissue in response to the output signal, wherein each of the light emitting portion and the light detecting portion comprise a light source for emitting light and a light detector for detecting light, the method further comprising selectively switching a functionality of the light emitting portion and the light detecting portion. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A non-transitory computer readable medium having computer executable instructions for performing a method comprising:
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controlling a light emitting portion of the optical sensor to emit light at a plurality of wavelengths including at least four spaced apart wavelengths into a volume of a patient'"'"'s body tissue; receiving an output signal from a light detecting portion corresponding to light incident on the light detecting portion, the incident light comprising light emitted by the emitting portion and scattered by the body tissue volume; and computing a volume-independent measure of oxygen saturation in the volume of tissue in response to the output signal, wherein each of the light emitting portion and the light detecting portion comprise a light source for emitting light and a light detector for detecting light, the method further comprising selectively switching a functionality of the light emitting portion and the light detecting portion.
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Specification