US 11,911,564 B2
Apparatus for measuring properties of gases supplied to a patient
Matthew Jon Payton, Auckland (NZ); Kevin Peter O'Donnell, Auckland (NZ); Andrew Baden Clark, Auckland (NZ); Christopher Simon James Quill, Auckland (NZ); and Peter Geoffrey Hawkins, Auckland (NZ)
Assigned to Fisher & Paykel Healthcare Limited, Auckland (NZ)
Filed by Fisher & Paykel Healthcare Limited, Auckland (NZ)
Filed on Apr. 26, 2021, as Appl. No. 17/240,155.
Application 17/240,155 is a continuation of application No. 16/714,311, filed on Dec. 13, 2019, granted, now 11,007,340.
Application 16/714,311 is a continuation of application No. 15/010,321, filed on Jan. 29, 2016, granted, now 10,537,698, issued on Jan. 21, 2020.
Application 15/010,321 is a continuation of application No. 13/908,952, filed on Jun. 3, 2013, granted, now 9,265,902, issued on Feb. 23, 2016.
Application 13/908,952 is a continuation of application No. 11/572,822, granted, now 8,453,641, issued on Jun. 4, 2013, previously published as PCT/NZ2005/000219, filed on Aug. 19, 2005.
Claims priority of application No. 534853 (NZ), filed on Aug. 20, 2004.
Prior Publication US 2022/0040435 A1, Feb. 10, 2022
Int. Cl. A61M 16/00 (2006.01); A61M 16/10 (2006.01); A61M 16/16 (2006.01); A61M 16/06 (2006.01); A61M 16/08 (2006.01)
CPC A61M 16/1005 (2014.02) [A61M 16/0066 (2013.01); A61M 16/024 (2017.08); A61M 16/06 (2013.01); A61M 16/0666 (2013.01); A61M 16/0875 (2013.01); A61M 16/109 (2014.02); A61M 16/1075 (2013.01); A61M 16/1095 (2014.02); A61M 16/16 (2013.01); A61M 16/161 (2014.02); A61M 2016/0027 (2013.01); A61M 2016/102 (2013.01); A61M 2205/3368 (2013.01); A61M 2205/502 (2013.01); Y10S 261/65 (2013.01)] 27 Claims
OG exemplary drawing
 
1. An apparatus for measuring properties of gases supplied to a patient, the apparatus comprising:
a gases supply for providing a flow of gases; and
a delivery conduit configured to convey the flow of gases to the patient, the delivery conduit comprising:
a first end configured to be in fluid communication with the gases supply;
a second end opposite the first end, wherein gases are conveyed to the patient through the second end from the first end;
a heater wire configured to heat the delivery conduit, the heater wire extending along the delivery conduit; and
a humidity sensor positioned in the delivery conduit to be within the flow of gases, the humidity sensor proximate to the second end relative to the first end of the delivery conduit, the humidity sensor configured to measure humidity of gases flowing through the delivery conduit and provide a humidity measurement;
a controller configured to receive the humidity measurement and control heating of the heater wire based on the humidity measurement, the controller configured to apply power to the heater wire to control humidity of gases flowing through the delivery conduit; and
a circuit board positioned at or near a middle of a lumen formed by a wall of the delivery conduit, the circuit board comprising the humidity sensor, the flow of gases conveyed in the lumen of the delivery conduit.