Separating oximeter signal components based on color
First Claim
1. A method for use in pulse oximetry, comprising the steps of:
- receiving a first detector signal corresponding to a first optical signal channel of a pulse oximeter and a second detector signal corresponding to a second optical signal channel of said pulse oximeter;
resolving said first detector signal into first and second signal components based on an analysis related to mixing ratios, with respect to said first and second channels, of each of said first and second components; and
selecting one of said first and second components; and
processing said selected one of said first and second components to obtain physiological information regarding a patient.
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Accused Products
Abstract
A component of interest of an oximeter detector signal is distinguished from an interfering component based on a color difference between the components. The component of interest may be a pulsatile signal component, a baseline signal component such as a respiratory signal, or an artifact signal. The color difference between the component of interest and the interfering component is reflected in corresponding mixing ratios with respect to multiple optical channels of the pulse oximeter. The component of interest is separated from the interfering component by mathematical decomposition using the mixing ratios. In this manner, signal components can be isolated substantially free from frequency dependent filtering.
24 Citations
21 Claims
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1. A method for use in pulse oximetry, comprising the steps of:
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receiving a first detector signal corresponding to a first optical signal channel of a pulse oximeter and a second detector signal corresponding to a second optical signal channel of said pulse oximeter;
resolving said first detector signal into first and second signal components based on an analysis related to mixing ratios, with respect to said first and second channels, of each of said first and second components; and
selecting one of said first and second components; and
processing said selected one of said first and second components to obtain physiological information regarding a patient. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for use in pulse oximetry, comprising the steps of:
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receiving a detector signal including a first component and a second component;
distinguishing said first component of said detector signal from said second component based on a difference in color between said first and second components; and
using said distinguished first component to determine physiological information regarding a patient. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A method for use in pulse oximetry, comprising the steps of:
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receiving a detector signal including a first component and a second component;
mathematically decomposing said detector signal to isolate said first component from said detector signal by establishing a model of said detector signal as a combination of said first and second components and resolving said model to yield a representation of first components; and
processing said representation of said first component independent of said second component to provide physiological parameter information regarding a patient. - View Dependent Claims (14, 15, 16, 17)
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18. A pulse oximetry apparatus, comprising:
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a port for receiving first and second detector signals corresponding to first and second optical channels of said pulse oximeter, each of said first and second detector signals including first and second signal components; and
a processor for resolving said first detector signal into first and second components based on an analysis relating to mixing ratios with respect to said first and second channels of each of said first and second signal components, selecting one of said first and second components, and processing said selected one of said first and second components to obtain physiological information regarding said patient. - View Dependent Claims (19, 20, 21)
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Specification