Patent ID: 7866944

Claim:
A blower for a non-invasive ventilation device comprising: an electric motor having a shaft, said shaft defines a shaft axis; a housing having a housing inlet and a housing outlet between which is defined a flow path for gas; the housing outlet is structured to direct gas exiting the blower in a substantially axial first direction; the motor has a first side proximal said housing inlet, and a second side distal said housing inlet; a first impeller attached to the shaft on the first side of the motor and adapted to accelerate gas tangentially and to direct it radially outward; a stationary portion structured to direct a flow of gas exiting the first impeller from the first side of the motor to the second side of the motor via a substantially annular flow path; and a first stationary vane structure located adjacent said second side of the motor for receiving air exiting the annular flow path and directing the air radially inwards, said first stationary vane structure having a leading edge thereof located substantially inwards radially relative to the annular flow path, the first stationary vane structure is adapted to direct gas exiting the first impeller from flowing in a substantially tangential direction to flowing in a substantially radial inward direction.