US 11,717,626 B2
Automated control for detection of flow limitation
Jeffrey Peter Armitstead, Sydney (AU); Peter Edward Bateman, Sydney (AU); and David John Bassin, Sydney (AU)
Assigned to ResMed Pty Ltd
Filed by ResMed Pty Ltd, Bella Vista (AU)
Filed on Dec. 18, 2019, as Appl. No. 16/719,427.
Application 16/719,427 is a continuation of application No. 15/151,641, filed on May 11, 2016, granted, now 10,549,053.
Application 15/151,641 is a continuation of application No. 12/599,715, granted, now 9,358,353, issued on Jun. 7, 2016, previously published as PCT/AU2008/000647, filed on May 9, 2008.
Claims priority of provisional application 60/965,172, filed on Aug. 17, 2007.
Claims priority of application No. 2007902561 (AU), filed on May 11, 2007.
Prior Publication US 2020/0197640 A1, Jun. 25, 2020
Int. Cl. A61M 16/00 (2006.01)
CPC A61M 16/0069 (2014.02) [A61M 16/0003 (2014.02); A61M 16/026 (2017.08); A61M 2016/003 (2013.01); A61M 2016/0027 (2013.01); A61M 2016/0036 (2013.01); A61M 2205/3327 (2013.01); A61M 2205/3334 (2013.01); A61M 2205/50 (2013.01); A61M 2230/40 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A method of a controller for determining a treatment setting in a respiratory treatment device, comprising:
receiving, by the controller, data representing a measure of respiratory flow obtained by a sensor;
from the data representing the measure of respiratory flow, determining a shape index representing a degree of partial obstruction;
from the data representing the measure of respiratory flow, determining a ventilation measure representing a degree of change in ventilation between a current breath and recent breath history, the degree of change in ventilation being a ratio of ventilation of the current breath to ventilation of the recent breath history;
determining a flow limitation measure based on the degree of partial obstruction and the degree of change in ventilation; and
calculating an adjustment amount to a treatment setting, the adjustment amount being a multiplication of the flow limitation measure,
wherein the controller operates the respiratory treatment device to control a treatment with the treatment setting.
 
8. An apparatus for respiratory treatment comprising:
a sensor to determine a measure of respiratory flow;
a processor configured to:
(a) determine from the measure of respiratory flow a shape index representing a degree of partial obstruction,
(b) determine from the measure of respiratory flow a ventilation measure representing a degree of change in ventilation between a current breath and recent breath history, the degree of change in ventilation being a ratio of ventilation of the current breath to ventilation of the recent breath history;
(c) determine a flow limitation measure based on the degree of partial obstruction and the degree of change in ventilation; and
(d) calculate an adjustment amount to a treatment setting, the adjustment amount being a multiplication of the flow limitation measure; and
a flow generator configured to provide respiratory treatment, wherein the processor is configured to control generation of the treatment with the treatment setting.