Ventilator arrangement to assist patient breathing over long periods has additional sound sources within the housing that act to cancel out sounds produced by the ventilator, etc., resulting in a quieter device

摘要

Device for delivery of a breathable gas at an over pressure to a gas mask or similar, where the device comprises a housing (1) containing a ventilator to move the air from the intake to the outlet. The device includes a sound source such as a piezo- electric device for producing a sound event that acts to reduce the overall sound produced by the ventilator.