Vent system for cpap patient interface used in treatment of sleep disordered breathing
AssigneeResMed Limited
InventorsDonald DARKIN, Patrick J. Mcauliffe
Life of this patent
Estimating the term…
Abstract
A vent assembly for use with a mask assembly includes a first vent and a second vent having at least one different flow characteristic wherein the vent assembly can be switched between the first vent and the second vent to alter flow of exhaled gas from a patient.
Claims30
A patient interface for delivery of a flow of breathable gas at a continuously positive treatment pressure with respect to ambient air pressure to an entrance to a patient's airways, while the patient is sleeping, to ameliorate sleep disordered breathing, said patient interface comprising:
- a patient contacting portion to seal against an area surrounding the entrance to the patient's airways for the flow of breathable gas;
- a frame defining a cavity pressurised at the treatment pressure;
- and
- a gas washout vent configured to allow a flow of patient exhaled CO2 to an exterior of the patient interface to minimise rebreathing of exhaled CO2 by the patient, the gas washout vent comprising an orifice, a first vent, and a second vent, the gas washout vent having a first position wherein the orifice is in pneumatic communication with the first vent, and the gas washout vent having a second position wherein the orifice is in pneumatic communication with the second vent,
- wherein a first visual indicator is associated with said first position and a second visual indicator is associated with said second position.
A patient interface for delivery of a flow of breathable gas at a continuously positive treatment pressure with respect to ambient air pressure to an entrance to a patient's airways, while the patient is sleeping, to ameliorate sleep disordered breathing, said patient interface comprising:
- a patient contacting portion to seal against an area surrounding the entrance to the patient's airways for the flow of breathable gas;
- a frame defining a cavity pressurised at the treatment pressure;
- and
- a gas washout vent configured to allow a flow of patient exhaled CO2 to an exterior of the patient interface to minimise rebreathing of exhaled CO2 by the patient, the gas washout vent comprising a first member structured to conduct the flow of gas therethrough and a second member disposed about the first member, at least one of the first member and the second member having a tubular shape,
- wherein the first member has a longitudinal axis and the second member is slidable axially along the longitudinal axis, and
- wherein the first member comprises an orifice and the second member comprises a first vent and a second vent.
A patient interface for delivery of a flow of breathable gas at a continuously positive treatment pressure with respect to ambient air pressure to an entrance to a patient's airways, while the patient is sleeping, to ameliorate sleep disordered breathing, said patient interface comprising:
- a patient contacting portion to seal against an area surrounding the entrance to the patient's airways for the flow of breathable gas;
- a frame defining a cavity pressurised at the treatment pressure;
- and
- a gas washout vent configured to allow a flow of patient exhaled CO2 to an exterior of the patient interface to minimise rebreathing of exhaled CO2 by the patient, the gas washout vent comprising a first member and a second member,
- wherein the first member has a longitudinal axis and the second member is rotatable about the longitudinal axis,
- wherein the first member comprises an orifice and the second member comprises a first vent and a second vent, and
- wherein a cross-sectional area of the gas washout vent is defined by a portion of the orifice aligned with the first vent or the second vent.
Dependencies are inferred from the claim text.