Robust fractional saturation determination
First Claim
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1. A patient monitoring system comprising:
- an optical sensor configured to emit light of a plurality of wavelengths directed at a measurement site of tissue of a patient and detect the light after attenuation by the measurement site to produce a signal representative of the light after attenuation; and
a patient monitor comprising;
one or more hardware processors configured to;
determine a methemoglobin measurement and a carboxyhemoglobin measurement from the signal,determine that the methemoglobin measurement is indicative of a low methemoglobin condition, andin response to determining that the methemoglobin measurement is indicative of the low methemoglobin condition, change the carboxyhemoglobin measurement to a weighted carboxyhemoglobin measurement that is correlated to the carboxyhemoglobin measurement; and
a display configured to display a parameter value responsive to the carboxyhemoglobin measurement.
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Abstract
The present disclosure describes the derivation and measurement of a fractional oxygen saturation measurement. In one embodiment, a system includes an optical sensor and a processor. The optical sensor can emit light of multiple wavelengths directed at a measurement site of tissue of a patient, detect the light after attenuation by the tissue, and produce a signal representative of the detected light after attenuation. The processor can receive the signal representative of the detected light after attenuation and determine, using the signal, a fractional oxygen saturation measurement based on two or more different measures of fractional oxygen saturation.
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20 Claims
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1. A patient monitoring system comprising:
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an optical sensor configured to emit light of a plurality of wavelengths directed at a measurement site of tissue of a patient and detect the light after attenuation by the measurement site to produce a signal representative of the light after attenuation; and a patient monitor comprising; one or more hardware processors configured to; determine a methemoglobin measurement and a carboxyhemoglobin measurement from the signal, determine that the methemoglobin measurement is indicative of a low methemoglobin condition, and in response to determining that the methemoglobin measurement is indicative of the low methemoglobin condition, change the carboxyhemoglobin measurement to a weighted carboxyhemoglobin measurement that is correlated to the carboxyhemoglobin measurement; and a display configured to display a parameter value responsive to the carboxyhemoglobin measurement. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of patient monitoring, the method comprising:
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emitting light of a plurality of wavelengths directed at a measurement site of tissue of a patient; detecting the light after attenuation by the measurement site to produce a signal representative of the light after attenuation; determining, with one or more hardware processors, a first methemoglobin measurement and a first carboxyhemoglobin measurement from the signal; determining, with the one or more hardware processors, that the first methemoglobin measurement is indicative of a low methemoglobin condition; in response to determining that the first methemoglobin measurement is indicative of the low methemoglobin condition, changing, with the one or more hardware processors, the first carboxyhemoglobin measurement to a weighted carboxyhemoglobin measurement that is correlated to the first carboxyhemoglobin measurement; and displaying, with a display, a first parameter value responsive to the first carboxyhemoglobin measurement. - View Dependent Claims (17, 18, 19, 20)
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Specification