Method of analyzing photon density waves in a medical monitor
First Claim
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1. A monitoring system, comprising:
- an emission feature configured to emit light into tissue;
a modulator configured to modulate the emitter at a modulation frequency generally in a range of about 50 MHz to 3.0 GHz to generate a generally resolvable photon density waves;
a detection feature configured to detect photons of the photon density waves after passage through the tissue and configured to provide a distribution of detected photons over a time period for the photon density waves; and
a processor configured to calculate a skewness of the distribution and making determinations relating to a value of a physiologic parameter of the tissue based at least in part on the skewness of the distribution.
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Abstract
A monitoring system that may include an emission feature capable of emitting light into tissue, a modulator capable of modulating the emitter at a modulation frequency generally in a range of about 50 MHz to 3.0 GHz to generate resolvable photon density waves, a detection feature capable of detecting photons of the photon density waves after passage through the tissue and capable of providing a distribution of detected photons over a time period for the photon density waves, and a processor capable of calculating a skewness of the distribution and making determinations relating to a value of a physiologic parameter of the tissue based at least in part on the skewness of the distribution.
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Citations
20 Claims
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1. A monitoring system, comprising:
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an emission feature configured to emit light into tissue; a modulator configured to modulate the emitter at a modulation frequency generally in a range of about 50 MHz to 3.0 GHz to generate a generally resolvable photon density waves; a detection feature configured to detect photons of the photon density waves after passage through the tissue and configured to provide a distribution of detected photons over a time period for the photon density waves; and a processor configured to calculate a skewness of the distribution and making determinations relating to a value of a physiologic parameter of the tissue based at least in part on the skewness of the distribution. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of analyzing tissue, comprising:
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modulating light from an emitter of a patient monitoring device at a modulation frequency in a range of about 50 MHz to 3.0 GHz to generate photon density waves; transmitting the photon density waves into a medium; detecting the photon density waves after passing through at least a portion of the medium; providing a data distribution of detected photons over a time period for the photon density waves; calculating a skewness of the data distribution; providing a value of a physiologic parameter of the tissue based at least in part on the skewness of the data distribution. - View Dependent Claims (13, 14, 15, 16)
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17. A pulse oximeter, comprising:
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a modulation feature configured to modulate an emitter at modulation frequencies in a range of about 50 MHz to 3.0 GHz to produce photon density waves of red and infrared light; a detector configured to detect the photon density waves after the photon density waves have passed through tissue and configured to use data acquired from detection of the photon density waves to output a photon density wave signal that is indicative of a number of photons detected over a time period; analysis circuitry configured to calculate a skewness of the photon density wave signal that correlates to scattering of the photons in the tissue, wherein the analysis circuitry is configured to identify characteristics of the tissue based at least in part on a comparison of operational aspects of the modulation feature and the skewness of the photon density wave signal. - View Dependent Claims (18, 19, 20)
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Specification