Patent ID: 8439035
Filing Date: 2013-05-14
Classification: A61B,A61M,G01F

Abstract:
1. A flow regulation vent for venting washout gas to atmosphere and for regulating flow from a pressurized gas supply, comprising: a housing having a vent orifice and a curved surface at least partially surrounding the vent orifice; and a spring force biased flap adapted to be flowingly connected to the pressurized gas supply, the flap having a first portion connected to the housing and a movable portion pivoted by the spring force away from the housing in a relaxed state to establish a first gas washout flow area between the flap and the vent orifice; whereby, an increase in a pressure of the pressurized gas supply progressively offsets the spring force of the flap to move an increasing portion of the movable flap portion into contact with the curved surface of the housing to decrease the gas washout flow area between the flap and the vent orifice, wherein the first portion of the flap connected to the housing is a first end of the flap and the movable portion of the flap is outboard of the first end of the flap.