Gas delivery means for respirators and anesthesia apparatus
First Claim
1. A medical breathing system gas delivery arrangement, comprising:
- a radial flow compressor withan impeller with bent-backwards blades,a housing, said compressor impeller being arranged in said housing, said housing having a gas inlet located in an area of an axis of rotation of said compressor impeller, and said blades extending from said gas inlet to a circular outer edge of said compressor impeller and said blades terminating nearly tangentially at said circular outer edge, said housing defining a gas flow path between an outer extent of said compressor impeller and an inner wall of said housing and passing over into a gas outlet in a direction of gas flow, andan electric motor driving said compressor impeller, said compressor impeller having a radius of up to 40 mm and a mass moment of inertia of up to about 4×
10-6 kg×
m2 ;
control means for controlling said motor to provide a respiration gas flow from said radial flow compressor.
2 Assignments
0 Petitions
Accused Products
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 4×10-6 kg×m2. 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.
-
Citations
11 Claims
-
1. A medical breathing system gas delivery arrangement, comprising:
-
a radial flow compressor with an impeller with bent-backwards blades, a housing, said compressor impeller being arranged in said housing, said housing having a gas inlet located in an area of an axis of rotation of said compressor impeller, and said blades extending from said gas inlet to a circular outer edge of said compressor impeller and said blades terminating nearly tangentially at said circular outer edge, said housing defining a gas flow path between an outer extent of said compressor impeller and an inner wall of said housing and passing over into a gas outlet in a direction of gas flow, and an electric motor driving said compressor impeller, said compressor impeller having a radius of up to 40 mm and a mass moment of inertia of up to about 4×
10-6 kg×
m2 ;control means for controlling said motor to provide a respiration gas flow from said radial flow compressor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. A gas delivery arrangement, comprising:
-
a radial flow compressor with an impeller with bent-backwards blades, a housing, said compressor impeller being arranged in said housing, said housing having a gas inlet located in an area of an axis of rotation of said compressor impeller, and said blades extending from said gas inlet to a circular outer edge of said compressor impeller and said blades terminating nearly tangentially at said circular outer edge, said housing defining a gas flow path between an outer extent of said compressor impeller and an inner wall of said housing and passing over into a gas outlet in a direction of gas flow, and an electric motor driving said compressor impeller, said compressor impeller having a radius of up to 40 mm and a mass moment of inertia of up to about 4×
10-6 kg×
m2 ;a gas storage space connected to said radial flow compressor and arranged upstream of said radial flow compressor; an ambient air connection connected to said gas storage space; an oxygen feed between said storage space and said radial flow compressor via a line; a supply line connected to said outlet of said radial flow compressor; a flow sensor disposed downstream of said radial flow compressor for monitoring flow in said supply line; an electronic unit connected to said sensor for controlling said radial flow compressor;
a nonreturn valve disposed in said supply line;a downstream exhalation valve connected to said supply line; a non return valve connected to said exhalation valve, said non return valve providing said exhalation valve with a connection to ambient air via said nonreturn valve; and a patient connection connected to said exhalation valve, wherein the arrangement forms a respirator.
-
-
11. A gas delivery arrangement, comprising:
-
a radial flow compressor with an impeller with bent-backwards blades, a housing, said compressor impeller being arranged in said housing, said housing having a gas inlet located in an area of an axis of rotation of said compressor impeller, and said blades extending from said gas inlet to a circular outer edge of said compressor impeller and said blades terminating nearly tangentially at said circular outer edge, said housing defining a gas flow path between an outer extent of said compressor impeller and an inner wall of said housing and passing over into a gas outlet in a direction of gas flow, and an electric motor driving said compressor impeller, said compressor impeller having a radius of up to 40 mm and a mass moment of inertia of up to about 4×
10-6 kg×
m2 ;a gas storage space connected to said radial flow compressor and arranged upstream of said radial flow compressor; an ambient air connection connected to said gas storage space; an oxygen feed between said storage space and said radial flow compressor via a line; a supply line connected to said outlet of said radial flow compressor; a flow sensor disposed downstream of said radial flow compressor for monitoring flow in said supply line; an electronic unit connected to said sensor for controlling said radial flow compressor; an inhalation line joining said flow sensor and having a nonreturn valve to a patient connection; an exhalation line with a nonreturn valve to an exhalation valve, through which only exhaled gas flows, said exhalation valve ambient air connection connected to ambient air and a connection to said supply line and said outlet of said radial flow compressor, wherein said arrangement forms a respirator.
-
Specification