Pulse oximeter and sensor optimized for low saturation
First Claim
1. A method for measuring blood oxygen saturation comprising:
- emitting light from at least one light source of a pulse oximeter sensor;
detecting a plurality of light spectrums having time-varying components from the light with at least one detector of the pulse oximeter sensor subsequent to the light being scattered by tissue, the plurality of light spectrums including a first light spectrum having a wavelength range optimized for high oxygen saturation, a second light spectrum having a wavelength range optimized for low oxygen saturation, and a third light spectrum having a wavelength between 800 and 1000 nanometers; and
calculating a blood oxygen saturation reading using a pulse oximetry algorithm based on at least two of the 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.
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Citations
16 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 of a pulse oximeter sensor; detecting a plurality of light spectrums having time-varying components from the light with at least one detector of the pulse oximeter sensor subsequent to the light being scattered by tissue, the plurality of light spectrums including a first light spectrum having a wavelength range optimized for high oxygen saturation, a second light spectrum having a wavelength range optimized for low oxygen saturation, and a third light spectrum having a wavelength between 800 and 1000 nanometers; and calculating a blood oxygen saturation reading using a pulse oximetry algorithm based on at least two of the detected light spectrums. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. 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 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 of approximately 660 nanometers, a second light spectrum having a wavelength of approximately 730 nanometers, and a third light spectrum having a wavelength of approximately 900 nanometers; and selecting two of the first, second and third light spectrums for use in determining a calculated oxygen saturation value based on an estimated value of oxygen saturation.
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9. A method for measuring blood oxygen saturation comprising:
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emitting a first light including a first light spectrum having a wavelength range optimized for high oxygen saturation from at least one light source of a pulse oximeter sensor; emitting a second light including a second light spectrum having a wavelength range optimized for low oxygen saturation from at least one light source of the pulse oximeter sensor; emitting a third light including a third light spectrum having a wavelength between 800 and 1000 nanometers from at least one light source of the pulse oximeter sensor; detecting the first, second, and third lights with at least one detector of the pulse oximeter sensor subsequent to the light being scattered by tissue, the detected lights having time-varying components; and calculating a blood oxygen saturation reading using a pulse oximetry algorithm based on at least two of the detected lights. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A method for measuring blood oxygen saturation comprising:
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emitting a first light having a wavelength of approximately 660 nanometers; emitting a second light having a wavelength of approximately 730 nanometers; emitting a third light having a wavelength of approximately 900 nanometers; detecting the first light with a detector subsequent to the first light being scattered by tissue; detecting the second light with the detector subsequent to the second light being scattered by the tissue; detecting the third light with the detector subsequent to the third light being scattered by the tissue; and selecting two of the first, second and third lights for use in determining a calculated oxygen saturation value based on an estimated value of oxygen saturation.
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Specification