US 12,337,118 B2
System and method for non-invasive ventilation
Sascha Kristopher Zoellner, Auckland (NZ); Bhavna Prentice, Auckland (NZ); Joseph Jules Nihotte, Auckland (NZ); Grant Leigh Nelson, Auckland (NZ); James Alexander Gordon, Auckland (NZ); and Brendan O'Neill, Auckland (NZ)
Assigned to FISHER & PAYKEL HEALTHCARE LIMITED, Auckland (NZ)
Appl. No. 17/040,007
Filed by Fisher & Paykel Healthcare Limited, Auckland (NZ)
PCT Filed Mar. 22, 2019, PCT No. PCT/IB2019/052329
§ 371(c)(1), (2) Date Sep. 21, 2020,
PCT Pub. No. WO2019/180668, PCT Pub. Date Sep. 26, 2019.
Claims priority of provisional application 62/646,745, filed on Mar. 22, 2018.
Prior Publication US 2021/0016050 A1, Jan. 21, 2021
Int. Cl. A61M 16/20 (2006.01); A61M 16/08 (2006.01); A61M 16/10 (2006.01); A61M 16/16 (2006.01)
CPC A61M 16/206 (2014.02) [A61M 16/0875 (2013.01); A61M 16/0883 (2014.02); A61M 16/1015 (2014.02); A61M 16/161 (2014.02); A61M 16/208 (2013.01); A61M 2205/3334 (2013.01); A61M 2205/3368 (2013.01)] 25 Claims
OG exemplary drawing
 
1. A system for providing respiratory gas to a patient, the system comprising:
a patient interface;
a breathing circuit to provide fluid communication between a source of respiratory gas and the patient interface, the breathing circuit and patient interface defining a primary flow path and a flushing flow path from the source of respiratory gas; and
a control assembly configured to dynamically vary flow through the primary flow path by opening and restricting the primary flow path in response to dynamic changes in gas flow or resistance to gas flow, such that when the control assembly increases a restriction to flow through the primary flow path, flow of respiratory gas through the flushing flow path increases,
wherein the control assembly also comprises a feedback port adapted to fluidly couple to a breathing chamber of the patient interface, and is configured to increase the resistance to gas flow of the primary flow path when a feedback pressure coupled from the breathing chamber to the control assembly is greater than about a gas source pressure.
 
15. A system for non-invasive ventilation comprising:
a gas source conduit adapted to be fluidly coupled at a first end to a gas source and comprising at a second end a bifurcation having a first branch and a second branch;
a primary flow path conduit adapted to be coupled to the first branch of the bifurcation as part of a primary flow path;
a flushing flow path conduit adapted to be coupled to the second branch of the bifurcation as part of a flushing flow path having a higher resistance to gas flow than primary flow path;
a patient interface comprising a breathing chamber and a nasal flow delivery part, constructed such that the breathing chamber is in the primary flow path and the nasal flow delivery part is in the flushing flow path;
a control assembly coupled or adapted to be coupled to the primary flow path, the control assembly comprising a movable member movable between a first position in which the movable member increases a resistance to gas flow through the primary flow path and a second position in which the movable member does not increase the resistance to gas flow through the primary flow path, the movable member configured to move between the first position and the second position in response to pressure changes within the breathing chamber of the patient interface; and
wherein a portion of the primary flow path conduit and a portion of the flushing flow path conduit share a wall.