US 12,296,095 B2
Methods and systems for controlling oxygen delivery in a flow therapy apparatus
Anton Kim Gulley, Auckland (NZ); Russel William Burgess, Auckland (NZ); Bryn Alan Edwards, Auckland (NZ); and Christopher Malcolm Crone, Auckland (NZ)
Assigned to Fisher & Paykel Healthcare Limited, Auckland (NZ)
Appl. No. 17/753,543
Filed by Fisher & Paykel Healthcare Limited, Auckland (NZ)
PCT Filed Sep. 10, 2020, PCT No. PCT/NZ2020/050101
§ 371(c)(1), (2) Date Mar. 7, 2022,
PCT Pub. No. WO2021/049954, PCT Pub. Date Mar. 18, 2021.
Claims priority of provisional application 62/898,464, filed on Sep. 10, 2019.
Prior Publication US 2022/0331548 A1, Oct. 20, 2022
Int. Cl. A61M 16/20 (2006.01); A61M 16/00 (2006.01); A61M 16/10 (2006.01); A61M 16/12 (2006.01); F16K 31/06 (2006.01); G05D 16/20 (2006.01); G16H 20/40 (2018.01)
CPC A61M 16/024 (2017.08) [A61M 16/1005 (2014.02); A61M 16/125 (2014.02); A61M 16/204 (2014.02); G16H 20/40 (2018.01); A61M 2016/1025 (2013.01); A61M 2202/0208 (2013.01); F16K 31/0675 (2013.01); G05D 16/2022 (2019.01); G05D 16/208 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A respiratory apparatus that provides a flow of gases to a patient, the respiratory apparatus comprising:
an ambient air inlet;
a supplemental inlet for receiving supplemental gases from a supplemental gases source;
a valve, wherein the valve requires a minimum amount of current in order to open;
a gases composition sensor configured to measure gases composition of mixed flow of ambient air and supplemental gases;
a main controller configured to control delivery of gases to the patient, the controller configured to:
adjust actuation of a valve opening by controlling valve current; and
activate a coarse controller when a target flow rate of supplemental gas is increased from zero;
a coarse controller configured to:
control actuation of the valve opening by controlling the valve current, wherein the main controller or the coarse controller can control the valve current;
iteratively increases current supplied to the valve; and
switch control of the actuation of the valve to the main controller after flow through the valve is detected.