Abstract: This invention relates to a vent structure for a respiratory therapy system. In one form the vent structure comprises a vent housing. The vent housing may define a flow path for a flow of air being vented from the respiratory therapy system, a vent inlet configured to allow the flow of air to enter the flow path, and a vent outlet configured to allow the flow of air to exit the flow path into the surrounding ambient air. The vent housing may be configured so that the flow path comprises a curved turning region in which the flow path changes direction by at least 90°. The vent housing may comprise an inner path surface on an inner side of the flow path and an outer path surface on an outer side of the flow path. The width of the flow path at the turning region and at a region downstream of the turning region may be at least substantially 0.85 mm.

Abstract: The invention relates to a vent structure for a respiratory therapy system. In one form the vent structure comprises a vent housing, and a plurality of partitions inside the vent housing forming therebetween a plurality of vent slots. The vent slots comprise a vent inlet configured to receive an air flow, and a vent outlet configured to allow the air flow to exit into the surrounding ambient air. The partitions may be formed such that each vent slot has a smaller cross-sectional area at a first region closer to the vent inlet than a second region. The vent structure may comprise a plurality of deflectors configured to deflect the air flow through each vent slot towards a part of the vent housing and/or another component in the respiratory system. The vent structure may comprise a projecting portion extending outwardly from the vent outlet to inhibit generation of flow layer instabilities.

Abstract: The invention relates to a connection member configured to connect an air circuit to a patient interface to convey a flow of pressurised breathable gas. The connection member comprises: first and second tube portions configured to connect to a patient interface and air circuit respectively; an anti-asphyxia valve (AAV); and a vent for venting gas exhaled by the patient to the ambient air. The vent is formed between the first and second tube portions. The first tube portion may have a substantially straight first longitudinal central axis and the second tube portion may have a substantially straight second longitudinal central axis that is substantially straight, the first tube portion and the second tube portion being arranged with the first longitudinal central axis substantially parallel to the second longitudinal central axis. The AAV is located in a position on the connection member closer to the patient interface than the vent.