Oximeter with selection between calculations based on patient type
First Claim
1. A method for measuring blood oxygen saturation comprising:
- emitting light from at least one light source;
detecting a plurality of light spectrums having time-varying components from the light with at least one detector subsequent to the light being scattered by tissue, the plurality of light spectrums including a first light spectrum having a wavelength between 725 and 745 nanometers and a second light spectrum having a wavelength between 880 and 940 nanometers; and
calculating a blood oxygen saturation reading using a pulse oximetry algorithm based on the plurality of detected light spectrums.
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Abstract
A pulse oximeter sensor with a light source optimized for low oxygen saturation ranges and for maximizing the immunity to perturbation induced artifact. Preferably, a red and an infrared light source are used, with the red light source having a mean wavelength between 700-790 nm. The infrared light source can have a mean wavelength as in prior art devices used on patients with high saturation. The sensor of the present invention is further optimized by arranging the spacing between the light emitter and light detectors to minimize the sensitivity to perturbation induced artifact. The present invention optimizes the chosen wavelengths to achieve a closer matching of the absorption and scattering coefficient products for the red and IR light sources. This optimization gives robust readings in the presence of perturbation artifacts including force variations, tissue variations and variations in the oxygen saturation itself.
112 Citations
7 Claims
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1. A method for measuring blood oxygen saturation comprising:
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emitting light from at least one light source; detecting a plurality of light spectrums having time-varying components from the light with at least one detector subsequent to the light being scattered by tissue, the plurality of light spectrums including a first light spectrum having a wavelength between 725 and 745 nanometers and a second light spectrum having a wavelength between 880 and 940 nanometers; and calculating a blood oxygen saturation reading using a pulse oximetry algorithm based on the plurality of detected light spectrums. - View Dependent Claims (2, 3, 4)
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5. A method for measuring blood oxygen saturation comprising:
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emitting a first light, the first light having a wavelength between 725 and 745 nanometers; emitting a second light, the second light having a wavelength between 880 and 940 nanometers; detecting the first light with a detector subsequent to the first light being scattered by tissue and interacting with a time-varying blood supply; and detecting the second light with the detector subsequent to the second light being scattered by the tissue and interacting with a time-varying blood supply; and calculating a blood oxygen saturation reading using a pulse oximetry algorithm based on the detected first light and the detected second light. - View Dependent Claims (6, 7)
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Specification