US 12,214,125 B2
Distinguishing between central and obstructive sleep apnea
David Robin Whiting, Auckland (NZ); Amol Man Malla, Auckland (NZ); and Simei Gomes Wysoski, Auckland (NZ)
Assigned to Fisher & Paykel Healthcare Limited, Auckland (NZ)
Filed by Fisher & Paykel Healthcare Limited, Auckland (NZ)
Filed on May 21, 2021, as Appl. No. 17/303,161.
Application 17/303,161 is a continuation of application No. 16/520,194, filed on Jul. 23, 2019, granted, now 11,040,159.
Application 16/520,194 is a continuation of application No. 14/785,291, granted, now 10,406,306, issued on Sep. 10, 2019, previously published as PCT/IB2014/060787, filed on Apr. 17, 2014.
Claims priority of provisional application 61/813,081, filed on Apr. 17, 2013.
Prior Publication US 2021/0338951 A1, Nov. 4, 2021
Int. Cl. A61M 16/00 (2006.01); A61B 5/00 (2006.01); A61B 5/087 (2006.01)
CPC A61M 16/0069 (2014.02) [A61B 5/087 (2013.01); A61B 5/4818 (2013.01); A61B 5/4836 (2013.01); A61B 5/7267 (2013.01); A61M 16/026 (2017.08); A61M 2016/0027 (2013.01); A61M 2016/003 (2013.01); A61M 2016/0036 (2013.01); A61M 2205/3303 (2013.01); A61M 2205/3334 (2013.01); A61M 2205/50 (2013.01); A61M 2230/40 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A respiratory apparatus comprising:
a pressure or flow sensor for detecting a sensed breath, and
a control system configured to:
analyze one or more apnea features to make a determination whether a detected apnea event is obstructive sleep apnea or central sleep apnea,
wherein the one or more apnea features is derived from the sensed breath by calculating one or more statistical metrics of one or more breath features within one or more predefined breath-windows, each comprising a number of breaths preceding the detected apnea event.