Oximeter probe off indicator defining probe off space
First Claim
1. A method of determining whether an optical probe in an oximetry system is improperly positioned, the method comprising:
- acquiring data responsive to light attenuated by body tissue;
comparing characteristics of said data to a probe off space, wherein at least a portion of said probe off space comprises data acquired during known probe off conditions; and
when said characteristics fall within said probe off space, outputting a probe off indication capable of alerting a caregiver to an improperly positioned probe condition,wherein said characteristic comprises normalized data channels corresponding to at least two emitted wavelengths of light, and wherein said at least two emitted wavelengths of light are selected to reduce a likelihood of overlap between said probe off space and probe on space.
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Accused Products
Abstract
An embodiment of the present disclosure seeks to select characteristics of incoming intensity data that cause comparisons of selected characteristics to produce defined probe off space having reduced crossover with defined probe on space. Once defined, the present disclosure compares characteristics of incoming intensity data with the now defined probe off space, and in some embodiments, defined probe on space, to determine whether a probe off condition exists. When a processor determines a probe off condition exists, the processor may output or trigger an output signal that audibly and/or visually indicates to a user that the optical sensor should be adjusted for a proper application to a measurement site.
747 Citations
12 Claims
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1. A method of determining whether an optical probe in an oximetry system is improperly positioned, the method comprising:
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acquiring data responsive to light attenuated by body tissue; comparing characteristics of said data to a probe off space, wherein at least a portion of said probe off space comprises data acquired during known probe off conditions; and when said characteristics fall within said probe off space, outputting a probe off indication capable of alerting a caregiver to an improperly positioned probe condition, wherein said characteristic comprises normalized data channels corresponding to at least two emitted wavelengths of light, and wherein said at least two emitted wavelengths of light are selected to reduce a likelihood of overlap between said probe off space and probe on space. - View Dependent Claims (2, 3)
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4. A patient monitor comprising:
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an input receiving data responsive to light attenuated by body tissue, wherein the light comprises light emitted at least two of emission centroids ranging from about 605 nm to about 614 nm, from about 615 nm to about 624 nm, from about 625 nm to about 635 nm, from about 655 nm to about 665 nm, from about 690 nm to about 710 nm, from about 720 nm to about 740 nm, from about 785 nm to about 825 nm, and from 875 nm to about 935 nm; a memory storing probe off data corresponding to probe off space, wherein at least some of said probe off space corresponds to data acquired during known probe off conditions; and a processor programmed to compare said data received at said input with the probe off data to determine an occurrence of a probe off condition, wherein said comparing includes comparing normalized data channels responsive to said data received at said input, said normalized data channels selected to reduce a likelihood of overlap between said probe off space and probe on space, said processor also programmed to output a probe off indication upon determination of said occurrence. - View Dependent Claims (5, 6, 7, 8, 9)
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10. A patient monitor configured to received signals from a noninvasive optical sensor operatively attached to a patient, to process said signals and determine measurement values for one or more physiological parameters, and to output display indicia responsive to said measurement values to one or more displays, said monitor comprising:
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a sensor interface configured to receive said signals from said noninvasive optical sensor, said signals being responsive to light attenuated by tissue of said patient; a processor configured to process said signals to determine a plurality of data channels, each data channel responsive to portions of said signals that represent absorption of a different wavelength of light, said processor also configured to normalize said data channels and to select at least two of said normalized data channels to compare to predetermined data representing a probe off space and a probe on space, said at least two data channels selected to reduce a likelihood of overlap between said data of said probe off space and data of said probe on space, said processor outputting a probe off signal when one or more of said selected data channels sufficiently match said data representing said probe off space; and a caregiver alert configured to activate upon said outputting of said probe off signal to convey to a caregiver that said noninvasive optical sensor is not properly aligned with said tissue of said patient. - View Dependent Claims (11, 12)
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Specification