Respiration rate determination in impedance pneumography
First Claim
Patent Images
1. A method for deriving a signal quality metric, comprising:
- acquiring an impedance respiration signal;
generating a series of sets of windowed data from the impedance respiration signal, wherein each window of data comprises data points acquired over a specified duration and is offset from a preceding window by a fixed interval;
filtering the impedance respiration signal through at least an in-band filter to generate an in-band filtered signal;
for each window of in-band filtered signals, generating a respective power spectral density;
determining whether the respective power spectral density for a current window is noisy or not noisy;
if the respective power spectral density for the current window is not noisy, updating a previous power spectral density template based on the respective power spectral density for the current window to generate a current power spectral density template, wherein the respective power spectral density for the current window is weighted greater than the previous power spectral density template when generating the current power spectral density;
if the respective power spectral density for the current window is noisy, not updating the previous power spectral density template;
identifying at least one peak and the corresponding frequencies and powers associated with the identified peaks within the current power spectral density template; and
determining a respiration rate based on the at least one identified peak.
1 Assignment
0 Petitions
Accused Products
Abstract
A system for monitoring respiration, and a method for determining respiration rate, is disclosed. In one embodiment, the respiration rate is determined from a power spectral density template that is updated, or not, based on whether a power spectral density for a current window of in-band filtered impedance respiration signal is determined to be noisy or not.
-
Citations
18 Claims
-
1. A method for deriving a signal quality metric, comprising:
-
acquiring an impedance respiration signal; generating a series of sets of windowed data from the impedance respiration signal, wherein each window of data comprises data points acquired over a specified duration and is offset from a preceding window by a fixed interval; filtering the impedance respiration signal through at least an in-band filter to generate an in-band filtered signal; for each window of in-band filtered signals, generating a respective power spectral density; determining whether the respective power spectral density for a current window is noisy or not noisy; if the respective power spectral density for the current window is not noisy, updating a previous power spectral density template based on the respective power spectral density for the current window to generate a current power spectral density template, wherein the respective power spectral density for the current window is weighted greater than the previous power spectral density template when generating the current power spectral density; if the respective power spectral density for the current window is noisy, not updating the previous power spectral density template; identifying at least one peak and the corresponding frequencies and powers associated with the identified peaks within the current power spectral density template; and determining a respiration rate based on the at least one identified peak. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A non-transitory, computer-readable medium configured to store one or more routines executable by a processing system, the routines, when executed, causing acts to be performed comprising:
-
applying an in-band filter to an impedance respiration signal to generate an in-band filtered signal; generating a respective power spectral density for each of a series of windows of the in-band filtered signal, wherein each window comprises data points acquired over a specified duration and is offset from adjacent windows by a fixed interval; processing the respective power spectral density for each window in sequence to determine whether the respective power spectral density for each window is noisy or not noisy; updating, if the respective power spectral density for a current window is not noisy, a previous power spectral density template based on the respective power spectral density for the current window to generate a current power spectral density template; and determining a respiration rate based on one or more peaks identified in the current power spectral density template, wherein determining the respiration rate comprises; determining a power-weighted average of frequency components for a plurality of identified peaks; and determining a respiration rate from the power weighted average. - View Dependent Claims (12, 13)
-
-
14. A physiological monitoring system, comprising:
-
a memory storing one or more routines; and a processing component configured to execute the one or more routines stored in the memory, wherein the one or more routines, when executed by the processing component, cause acts to be performed comprising; acquiring an impedance respiration signal; generating a series of data windows from the impedance respiration signal, wherein each data window comprises data points acquired over a specified duration and is offset from a preceding window by a fixed interval; filtering the impedance respiration signal through at least an in-band filter to generate an in-band filtered signals; generating a respective power spectral density for each window of in-band filtered signals; determining whether the respective power spectral density for a current window is noisy or not noisy; updating, if the respective power spectral density for the current window is not noisy, a previous power spectral density template based on the respective power spectral density for the current window to generate a current power spectral density template wherein the respective power spectral density for the current window is weighted greater than the previous power spectral density template when generating the current power spectral density; and determining a respiration rate based the current power spectral density template. - View Dependent Claims (15, 16, 17, 18)
-
Specification