US 9,808,594 B2
Flow regulation vent
Muditha Pradeep Dantanarayana, Sydney (AU); and Saad Nasr, Sydney (AU)
Assigned to RESMED LIMITED, Bella Vista (AU)
Filed by ResMed Limited, Bella Vista, New South Wales (AU)
Filed on Oct. 20, 2016, as Appl. No. 15/298,474.
Application 15/298,474 is a continuation of application No. 15/001,521, filed on Jan. 20, 2016.
Application 15/001,521 is a continuation of application No. 13/891,237, filed on May 10, 2013, granted, now 9,278,186, issued on Mar. 8, 2016.
Application 13/891,237 is a continuation of application No. 10/433,980, granted, now 8,439,035, issued on May 14, 2013, previously published as PCT/AU01/01658, filed on Dec. 21, 2001.
Claims priority of provisional application 60/257,171, filed on Dec. 22, 2000.
Prior Publication US 2017/0049988 A1, Feb. 23, 2017
Int. Cl. A61M 16/20 (2006.01); A61B 5/08 (2006.01); A61M 16/06 (2006.01); A61B 5/087 (2006.01); G01F 1/28 (2006.01); A61M 16/08 (2006.01); A61M 16/00 (2006.01)
CPC A61M 16/208 (2013.01) [A61B 5/0876 (2013.01); A61M 16/0057 (2013.01); A61M 16/06 (2013.01); A61M 16/0616 (2014.02); A61M 16/0622 (2014.02); A61M 16/0633 (2014.02); A61M 16/0816 (2013.01); A61M 16/0825 (2014.02); A61M 16/0875 (2013.01); G01F 1/28 (2013.01); A61M 2016/0042 (2013.01); A61M 2205/332 (2013.01); A61M 2205/42 (2013.01); A61M 2210/0618 (2013.01)] 30 Claims
OG exemplary drawing
 
1. A flow regulation vent for use in controlling a vent flow of washout gas to atmosphere in a system for supplying breathable gas pressurized to within a therapeutic pressure range above atmospheric pressure to a patient in the treatment of a sleep disordered breathing condition, the flow regulation vent comprising:
a housing having at least one vent orifice and at least one fixed bleed orifice; and
a flap configured to regulate the vent flow of washout gas to atmosphere through the at least one vent orifice,
wherein the at least one fixed bleed orifice is not covered by the flap in any position and the flow regulation vent provides a minimum vent flow to atmosphere independent of the position of the flap, and
wherein the at least one vent orifice and the at least one fixed bleed orifice are structured such that the vent flow through the at least one vent orifice and the at least one fixed bleed orifice has a substantially constant flow rate when the breathable gas is pressurized to any pressure within the therapeutic pressure range.