Photoplethysmograph Filtering Using Empirical Mode Decomposition
First Claim
1. A method comprising:
- applying an empirical mode decomposition (EMD) algorithm on a physiological signal to produce one or more intrinsic mode functions, wherein the physiological signal corresponds to blood flow in a patient; and
determining one or more physiological parameters based on the one or more intrinsic mode functions.
2 Assignments
0 Petitions
Accused Products
Abstract
Present embodiments relate to systems, methods, and devices for decomposing a physiological signal of a patient using empirical mode decomposition (EMD). In one embodiment, the EMD algorithm may involve identifying a frequency component, referred to as an intrinsic mode function, in the physiological signal. The physiological signal may be decomposed into one or more intrinsic mode functions through multiple iterations of the EMD algorithm. Each subsequent mode function may have a different frequency component of the original physiological signal input into the EMD algorithm. In some embodiments, each mode function may be further analyzed and/or processed to determine various physiological data corresponding to blood flow in the patient.
26 Citations
23 Claims
-
1. A method comprising:
-
applying an empirical mode decomposition (EMD) algorithm on a physiological signal to produce one or more intrinsic mode functions, wherein the physiological signal corresponds to blood flow in a patient; and determining one or more physiological parameters based on the one or more intrinsic mode functions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. A method of determining physiological information of a patient comprising:
-
identifying extrema in an input signal, wherein the input signal comprises a portion of a physiological signal of the patient; calculating input signal envelopes based on the extrema of the input signal; subtracting a mean of the input signal envelopes from the input signal to produce a first mode function; subtracting the first mode function from the input signal to produce a residual signal; identifying extrema in the residual signal; calculating residual signal envelopes based on the extrema of the residual signal; subtracting a mean of the residual signal envelopes from the residual signal to produce a second mode function; and determining physiological information of the patient based on one or more of the first mode function and the second mode function. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18)
-
-
19. A system for determining physiological information of a patient, the system comprising:
-
a sensor configured to detect a physiological signal from the patient; a patient monitor coupled to the sensor, wherein the patient monitor comprises; a processor configured to apply an empirical mode decomposition (EMD) algorithm on the physiological signal to produce one or more intrinsic mode functions; and a processor configured to process the one or more intrinsic mode functions to determine one or more physiological parameters. - View Dependent Claims (20, 21, 22, 23)
-
Specification