METHOD AND APPARATUS FOR PULSE OXIMETRY
First Claim
1. A method for determining the oxygenation of blood comprising:
- sensing a first signal of a first wavelength, the first signal having a first arterial blood component and a first noise component;
sensing a second signal of a second wavelength, the second signal having a second arterial blood component and a second noise component, the first arterial blood component being related to the second arterial blood component by an arterial blood absorption ratio and the first noise component being related to the second noise component by a noise absorption ratio;
determining a value of the noise absorption ratio that maximizes the magnitude of an autocorrelation function; and
determining the oxygenation of blood from the noise absorption ratio.
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Abstract
An apparatus for determining the oxygenation of blood. The apparatus includes a detector that is configured to sense a first signal of a first wavelength, the first signal having a first arterial blood component and a first noise component. The detector is also configured to sense a second signal of a second wavelength, the second signal having a second arterial blood component and a second noise component. The first arterial blood component is related to the second arterial blood component by an arterial blood absorption ratio and the first noise component is related to the second noise component by a noise absorption ratio. The apparatus also includes a controller that is configured to determine a value of the noise absorption ratio that maximizes the magnitude of an autocorrelation function. The controller is further configured to determine the oxygenation of blood from the noise absorption ratio.
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Citations
30 Claims
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1. A method for determining the oxygenation of blood comprising:
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sensing a first signal of a first wavelength, the first signal having a first arterial blood component and a first noise component;
sensing a second signal of a second wavelength, the second signal having a second arterial blood component and a second noise component, the first arterial blood component being related to the second arterial blood component by an arterial blood absorption ratio and the first noise component being related to the second noise component by a noise absorption ratio;
determining a value of the noise absorption ratio that maximizes the magnitude of an autocorrelation function; and
determining the oxygenation of blood from the noise absorption ratio. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An apparatus for determining the oxygenation of blood comprising:
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a detector configured to sense a first signal of a first wavelength, the first signal having a first arterial blood component and a first noise component, the detector also configured to sense a second signal of a second wavelength, the second signal having a second arterial blood component and a second noise component, the first arterial blood component being related to the second arterial blood component by an arterial blood absorption ratio and the first noise component being related to the second noise component by a noise absorption ratio; and
a controller configured to determine a value of the noise absorption ratio that maximizes the magnitude of an autocorrelation function and configured to determine the oxygenation of blood from the noise absorption ratio. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A pulse oximeter comprising:
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a light source configured to provide first signal of a first wavelength and a second signal of a second wavelength;
a detector configured to sense the first signal of the first wavelength, the first signal having a first arterial blood component and a first noise component, the detector also configured to sense the second signal of the second wavelength, the second signal having a second arterial blood component and a second noise component, the first arterial blood component being related to the second arterial blood component by an arterial blood absorption ratio and the first noise component being related to the second noise component by a noise absorption ratio;
a processor configured to determine a value of the noise absorption ratio that maximizes the magnitude of an autocorrelation function and configured to determine the oxygenation of blood from the noise absorption ratio. - View Dependent Claims (20, 21)
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22. A method for determining the oxygenation of blood comprising:
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transmitting a signal through a medium containing blood;
sensing a first signal of a first wavelength, the first signal having a first arterial blood component and a first noise component;
sensing a second signal of a second wavelength, the second signal having a second arterial blood component and a second noise component, the first arterial blood component being related to the second arterial blood component by an arterial blood absorption ratio and the first noise component being related to the second noise component by a noise absorption ratio;
determining a value of the noise absorption ratio that maximizes the magnitude of an autocorrelation function; and
determining the oxygenation of blood from the noise absorption ratio. - View Dependent Claims (23, 24, 25, 26, 27)
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28. An apparatus for determining the oxygenation of blood comprising:
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a transmitter configured to transmit a signal through a medium containing blood;
a detector configured to sense a first signal of a first wavelength, the first signal having a first arterial blood component and a first noise component, the detector also configured to sense a second signal of a second wavelength, the second signal having a second arterial blood component and a second noise component, the first arterial blood component being related to the second arterial blood component by an arterial blood absorption ratio and the first noise component being related to the second noise component by a noise absorption ratio; and
a controller configured to determine a value of the noise absorption ratio that maximizes the magnitude of an autocorrelation function and configured to determine the oxygenation of blood from the noise absorption ratio. - View Dependent Claims (29, 30)
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Specification