NON-STATIONARY FEATURE RELATIONSHIP PARAMETERS FOR AWARENESS MONITORING
First Claim
1. A system for determining physiological information comprising:
- an input configured for receiving a physiological signal from a subject; and
one or more processors configured for;
transforming the physiological signal based on a wavelet transform to generate a transformed signal that comprises at least a time component and a scale component;
identifying a first feature associated with the transformed signal that varies in scale over time;
identifying a second feature associated with the transformed signal that varies in scale over time, wherein the first feature is related to the second feature;
determining a non-stationary relationship parameter over time based on a third or higher order equation, the first feature, and the second feature, wherein the non-stationary relationship parameter is indicative of the relationship between the first feature and the second feature; and
determining physiological information based on the non-stationary relationship parameter.
1 Assignment
0 Petitions
Accused Products
Abstract
Methods and systems are presented for determining physiological information in a physiological monitor. A physiological signal (e.g., an EEG signal) received from a subject is wavelet transformed and first and second related features that vary in scale over time are identified in the transformed signal. First and second coupled ridges of the respective first and second related features may also be identified in the transformed signal. A non-stationary relationship parameter is determined and is indicative of the relationship between the first and second features and/or between the first and second ridges. Physiological information, which may be indicative of a level of awareness of a subject, is determined based on the non-stationary relationship parameter. This physiological information may be used, for example, in an operating room to monitor/regulate the subject'"'"'s anesthetic state while under general anesthesia or in an intensive care unit to monitor the subject'"'"'s sedateness and administer medication accordingly.
-
Citations
21 Claims
-
1. A system for determining physiological information comprising:
-
an input configured for receiving a physiological signal from a subject; and one or more processors configured for; transforming the physiological signal based on a wavelet transform to generate a transformed signal that comprises at least a time component and a scale component; identifying a first feature associated with the transformed signal that varies in scale over time; identifying a second feature associated with the transformed signal that varies in scale over time, wherein the first feature is related to the second feature; determining a non-stationary relationship parameter over time based on a third or higher order equation, the first feature, and the second feature, wherein the non-stationary relationship parameter is indicative of the relationship between the first feature and the second feature; and determining physiological information based on the non-stationary relationship parameter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
-
-
16. A method for determining physiological information comprising:
-
receiving from an input a physiological signal from a subject; transforming, using one or more processors, the physiological signal based on a wavelet transform to generate a transformed signal that comprises at least a time component and a scale component; identifying, using one or more processors, a first feature associated with the transformed signal that varies in scale over time; identifying, using one or more processors, a second feature associated with the transformed signal that varies in scale over time, wherein the first feature is related to the second feature; determining, using one or more processors, a non-stationary relationship parameter over time based on a third or higher order equation, the first feature, and the second feature, wherein the non-stationary relationship parameter is indicative of the relationship between the first feature and the second feature; and determining, using one or more processors, physiological information based on the non-stationary relationship parameter. - View Dependent Claims (17, 18, 19, 20, 21)
-
Specification