Pulse oximetry motion artifact rejection using near infrared absorption by water
First Claim
1. A method of measuring a physiological parameter, comprising:
- obtaining a first signal derived from electromagnetic energy transmitted through a tissue portion at a first wavelength, said first signal including a signal portion corresponding with motion-related events and a signal portion corresponding with arterial pulsation events, wherein at said first wavelength water is a dominant absorber of electromagnetic energy in the tissue portion;
obtaining a second signal derived from electromagnetic energy transmitted through a tissue portion at a second wavelength, said second signal including a signal portion corresponding with motion-related events and a signal portion corresponding with arterial pulsation events, wherein at said second wavelength hemoglobin is a dominant absorber of electromagnetic energy in the tissue portion; and
combining said first signal and said second signal to generate a combined signal comprising a plethysmograph, said combined signal having a signal portion corresponding with motion-related events that is smaller than that present in said first signal or said second signal.
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Accused Products
Abstract
A method and an apparatus for measuring a physiological parameter, functioning based on obtaining a first signal derived from electromagnetic energy transmitted through a tissue portion at a first wavelength, the first signal including a signal portion corresponding with motion-related events and a signal portion corresponding with arterial pulsation events, where at the first wavelength water is a dominant absorber of electromagnetic energy in the tissue portion; obtaining a second signal derived from electromagnetic energy transmitted through a tissue portion at a second wavelength, the second signal including a signal portion corresponding with motion-related events and a signal portion corresponding with arterial pulsation events, where at the second wavelength hemoglobin is a dominant absorber of electromagnetic energy in the tissue portion; and combining the first signal and the second signal to generate a combined plethysmograph signal, such that the combined signal has a signal portion corresponding with motion-related events that is smaller than that present in the first signal or the second signal.
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Citations
24 Claims
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1. A method of measuring a physiological parameter, comprising:
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obtaining a first signal derived from electromagnetic energy transmitted through a tissue portion at a first wavelength, said first signal including a signal portion corresponding with motion-related events and a signal portion corresponding with arterial pulsation events, wherein at said first wavelength water is a dominant absorber of electromagnetic energy in the tissue portion;
obtaining a second signal derived from electromagnetic energy transmitted through a tissue portion at a second wavelength, said second signal including a signal portion corresponding with motion-related events and a signal portion corresponding with arterial pulsation events, wherein at said second wavelength hemoglobin is a dominant absorber of electromagnetic energy in the tissue portion; and
combining said first signal and said second signal to generate a combined signal comprising a plethysmograph, said combined signal having a signal portion corresponding with motion-related events that is smaller than that present in said first signal or said second signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An apparatus for measuring a physiological parameter, comprising:
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means for obtaining a first signal derived from electromagnetic energy transmitted through a tissue portion at a first wavelength, said first signal including a signal portion corresponding with motion-related events and a signal portion corresponding with arterial pulsation events, wherein at said first wavelength water is a dominant absorber of electromagnetic energy in the tissue portion;
means for obtaining a second signal derived from electromagnetic energy transmitted through a tissue portion at a second wavelength, said second signal including a signal portion corresponding with motion-related events and a signal portion corresponding with arterial pulsation events, wherein at said second wavelength hemoglobin is a dominant absorber of electromagnetic energy in the tissue portion; and
means for combining said first signal and said second signal to generate a combined signal comprising a plethysmograph, said combined signal having a signal portion corresponding with motion-related events that is smaller than that present in said first signal or said second signal. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification