US 12,290,687 B2
Acoustic sensing for respiration detection
Brian M. Shelton, Altadena, CA (US); Sahar Elyahoodayan, Los Angeles, CA (US); and Harshit R. Suri, Pasadena, CA (US)
Assigned to THE ALFRED E. MANN FOUNDATION FOR SCIENTIFIC RESEARCH, Valencia, CA (US)
Filed by The Alfred E. Mann Foundation for Scientific Research, Valencia, CA (US)
Filed on Feb. 16, 2024, as Appl. No. 18/444,432.
Application 18/444,432 is a continuation of application No. 17/228,593, filed on Apr. 12, 2021, granted, now 11,931,578.
Claims priority of provisional application 63/008,118, filed on Apr. 10, 2020.
Prior Publication US 2024/0226564 A1, Jul. 11, 2024
Int. Cl. A61N 1/36 (2006.01); A61B 7/00 (2006.01); A61N 1/05 (2006.01); A61N 1/372 (2006.01); A61N 1/378 (2006.01)
CPC A61N 1/3611 (2013.01) [A61B 7/003 (2013.01); A61N 1/05 (2013.01); A61N 1/37217 (2013.01); A61N 1/3787 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A system for treating a patient, comprising:
at least one acoustic sensor configured to detect one or more acoustic signals generated by a heart and/or lungs of the patient; and
a stimulator comprising:
a stimulation system configured to deliver stimulation to a nerve which innervates an upper airway muscle; and
a controller coupled to the stimulation system, and to the at least one acoustic sensor, wherein the controller is configured to
determine a respiratory cycle of the patient based on the one or more acoustic signals, by a set of signal processing operations comprising:
generating a filtered signal by filtering the one or more acoustic signals using at least one first low pass filter and at least one high pass filter,
extracting a signal envelope from the filtered signal,
downsampling the extracted signal envelope, and
extracting a respiratory waveform corresponding to a first respiratory cycle of the patient, by applying a second low pass filter to the downsampled and extracted signal envelope; and to
cause the stimulation system to stimulate the nerve based on the determined respiratory cycle.