Pulse oximetry data confidence indicator
First Claim
1. A method of providing a caregiver an indication of signal quality acquired from a physiological signal output from a physiological sensor, the method comprising:
- acquiring a physiological data set from a physiological sensor output of a physiological sensor capable of sensing light attenuated by body tissue, wherein the physiological sensor output is related to one or more physiological parameters of a patient;
deriving a plurality of signal quality measures from the physiological sensor output;
comparing the plurality of signal quality measures to a corresponding plurality of thresholds to determine a confidence measure, the confidence measure corresponding to the physiological data set; and
presenting data representative of the confidence measure and data representative of the physiological data set, wherein the data representative of the confidence measure is presented in a bar display.
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Accused Products
Abstract
A data confidence indicator includes a plurality of physiological data and a plurality of signal quality measures derived from a physiological sensor output, and a plurality of comparator outputs each responsive to one of the measures and a corresponding one of a plurality of thresholds. An alert trigger output combines the comparator outputs. A low signal quality warning is generated in response to the alert trigger output, wherein the thresholds are set so that the warning occurs during a time period when there is low confidence in the data. The alert may be in the form of a message generated on the pulse oximeter display to warn that the accuracy of saturation and pulse rate measurements may be compromised. A confidence-based alarm utilizes signal quality measures to reduce the probability of false alarms when data confidence is low and to reduce the probability of missed events when data confidence is high.
1419 Citations
24 Claims
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1. A method of providing a caregiver an indication of signal quality acquired from a physiological signal output from a physiological sensor, the method comprising:
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acquiring a physiological data set from a physiological sensor output of a physiological sensor capable of sensing light attenuated by body tissue, wherein the physiological sensor output is related to one or more physiological parameters of a patient;
deriving a plurality of signal quality measures from the physiological sensor output;
comparing the plurality of signal quality measures to a corresponding plurality of thresholds to determine a confidence measure, the confidence measure corresponding to the physiological data set; and
presenting data representative of the confidence measure and data representative of the physiological data set, wherein the data representative of the confidence measure is presented in a bar display. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of providing a caregiver an indication of signal quality acquired from a physiological signal output from a physiological sensor, the method comprising:
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acquiring a physiological data set from the physiological sensor output, wherein the physiological sensor output is related to one or more physiological parameters of a patient;
deriving a plurality of signal quality measures from the physiological sensor output;
comparing the plurality of signal quality measures to a corresponding plurality of thresholds to determine a confidence measure, the confidence measure corresponding to the physiological data set; and
presenting data representative of the confidence measure and data representative of the physiological data set, wherein the step of presenting the data representative of the confidence measure further comprises issuing an audible signal, wherein the step of issuing the audible signal further comprises varying a volume of the audible signal to indicate the confidence measure, and wherein the step of varying the volume of the audible signal further comprises raising the volume as the confidence measure becomes more positive and lowering the volume as the confidence measure becomes less positive.
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12. A method of providing a caregiver an indication of signal quality acquired from a physiological signal output from a physiological sensor, the method comprising:
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acquiring a physiological data set from the physiological sensor output, wherein the physiological sensor output is related to one or more physiological parameters of a patient;
deriving a plurality of signal quality measures from the physiological sensor output;
comparing the plurality of signal quality measures to a corresponding plurality of thresholds to determine a confidence measure, the confidence measure corresponding to the physiological data set;
presenting data representative of the confidence measure and data representative of the physiological data set;
timeshifting the physiological data set by a delay to generate a delayed data set, wherein the delay is a function of the confidence measure;
comparing the physiological data set and the delayed data set to a threshold; and
generating a warning when levels of the physiological data set and the delayed data set are beyond said threshold.
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13. A method of providing a caregiver an indication of signal quality acquired from a physiological signal output from a physiological sensor, the method comprising:
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acquiring a physiological data set from the physiological sensor output, wherein the physiological sensor output is related to one or more physiological parameters of a patient;
deriving a plurality of signal quality measures from the physiological sensor output;
comparing the plurality of signal quality measures to a corresponding plurality of thresholds to determine a confidence measure, the confidence measure corresponding to the physiological data set and depending on at least one of an integrity measure, a pulse rate density measure and a harmonic ratio measure;
presenting data representative of the confidence measure and data representative of the physiological data set; and
generating an alert when each of the integrity measure, the pulse rate density measure, and the harmonic ratio measure falls below one or more thresholds associated with each of the integrity measure, the pulse rate density measure, and the harmonic ratio measure.
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14. A data confidence indication method comprising the steps of:
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acquiring a signal from a physiological sensor;
calculating a physiological data set from said signal;
calculating a plurality of signal quality measures from said signal;
setting an alarm threshold for said data set; and
delaying an alarm trigger when said data set exceeds said threshold as a function of at least one of said signal quality measures so as to reduce the probability of false alarms. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A data confidence indication method comprising the steps of:
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acquiring a signal from a physiological sensor;
calculating a physiological data set from said signal;
calculating a plurality of signal quality measures from said signal;
setting an alarm threshold for said data set;
delaying an alarm trigger when said data set exceeds said threshold as a function of at least one of said signal quality measures so as to reduce the probability of false alarms;
comparing the plurality of signal quality measures to a corresponding plurality of thresholds to determine a confidence measure, the confidence measure corresponding to the physiological data set; and
presenting data representative of the confidence measure and data representative of the physiological data set, wherein the step of presenting the data representative of the confidence measure further comprises issuing an audible signal, wherein the step of issuing the audible signal further comprises varying a volume of the audible signal to indicate the confidence measure, and wherein the step of varying the volume of the audible signal further comprises raising the volume as the confidence measure becomes more positive and lowering the volume as the confidence measure becomes less positive.
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Specification