Surgery – Respiratory method or device – Means for supplying respiratory gas under positive pressure
Patent
1997-11-06
1999-03-02
Weiss, John G.
Surgery
Respiratory method or device
Means for supplying respiratory gas under positive pressure
12820421, 12820422, 415206, A61A 1600
Patent
active
058757830
ABSTRACT:
A gas delivery arrangement for respirators and anesthesia apparatus includes a radial flow compressor (10) with bent-backwards blades. The compressor impeller (11) is arranged in a stationary housing (14). The gas inlet (12) is located in the area of the axis of rotation of the compressor impeller (11) and the blades (13) extend from the gas inlet (12) in the area of the axis of rotation to the circular outer edge of the compressor impeller (11) and end there nearly tangentially. The free gas flow path between the outer edge of the compressor impeller (11) and the inner wall of the housing (14) passes over into the gas outlet (15) of the gas delivery arrangement in the direction of gas flow. The compressor impeller is driven by an electric motor and has a radius of up to 40 mm and a mass moment of inertia of up to about 4.times.10.sup.-6 kg.times.m.sup.2. The arrangement is an extremely compact gas delivery arrangement, which requires few components and no valves, can be used in a versatile manner and is able to change pressures in a highly dynamic manner, is provided by the subject of the present invention. The pneumatic resistance of the gas delivery arrangement according to the present invention is less than 4 mbar at a gas flow rate of 60 L per minute.
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patent: 5551419 (1996-09-01), Ryoehlich
patent: 5603315 (1997-02-01), Sasso, Jr.
patent: 5626461 (1997-05-01), Rose
patent: 5694926 (1997-12-01), DeVries et al.
Anderson Charles W.
Dragerwerk AG
Weiss John G.
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