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US 2019/0099569 A1Published application
System, apparatus and method for supplying gases
AssigneeFisher & Paykel Healthcare Limited
InventorsDavid M. Rapoport, Donald Roy Kuriger, Mark John Arrowsmith
Life of this patent
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Abstract
A system, apparatus and methods are provided for supplying gases to a user. The supply includes a sub-therapeutic mode and a pressure support mode for delivering therapy to a user. A flow diversion device or valve switches from a first mode corresponding with the sub-therapeutic mode of the system to a second mode corresponding with the pressure support mode of the system. In the first mode, the valve opens a larger flow path between the interior of the user interface and ambient air than in the second mode.
Claims16
-32. (canceled)
A flow diversion device comprising:
- an inlet portion comprising an inlet connector portion,
- an outlet portion comprising an outlet connector portion,
- a flow path provided through a body from an inlet end of the inlet portion to an outlet end of the outlet portion,
- a central portion comprising a flow port extending through a wall of the flow diversion device, wherein the flow path through the flow diversion device can communicate with ambient surroundings through the flow port,
- a flexible valve member that extends into the flow path at a location between the inlet end of the inlet portion and the flow port,
- wherein the wall defines an inner surface of the flow path, the inner surface comprising an internal perimeter surface surrounding the flow port that acts as a valve seat when the flow diversion device is in a closed condition,
- wherein the flow diversion device is configured such that flow through the flow diversion device from the inlet end of the inlet portion to the outlet end of the outlet portion pushes against the flexible valve member to urge the flexible valve member toward the closed condition,
- wherein the flow diversion device is configured such that flow through the flow diversion device from the outlet portion to the inlet portion pushes against the flexible valve member to urge it toward the inlet portion and an opened condition,
- wherein a gap is provided between at least a portion of the perimeter of the flexible valve member and the inner surface of the wall, and
- wherein a substantial portion of the flow path is unimpinged by the flexible valve member in the opened condition.
7 more elements
Dependencies are inferred from the claim text.