Medical ventilator with internal casing including a motorized micro-blower and gas circuits

1. A respiratory assistance apparatus ( 10 ) comprising a rigid casing ( 1 ) comprising a motor compartment ( 3 ) within which a motorized micro-blower ( 2 ) is arranged,

characterized in that the casing ( 1 ) is formed from a first and a second half-casing ( 1 a , 1 b ) which are rigidly connected to each other in a leaktight manner, said rigid casing ( 1 ) comprising:

an air inlet compartment ( 11 ) comprising an air inlet opening ( 12 ) in communication with the atmosphere, said air inlet compartment ( 11 ) additionally being in fluidic communication with the motor compartment ( 3 ) via at least one air outlet opening ( 13 ),

a gas outlet compartment ( 14 ) comprising a gas supply opening ( 15 ), said gas outlet compartment ( 14 ) being fed with gas by the motorized micro-blower ( 2 ),

an oxygen circuit ( 16 ) comprising an oxygen inlet ( 17 ) and at least one oxygen outlet ( 18 ), said at least one oxygen outlet being in fluidic communication with the motor compartment ( 3 ), and

a venting circuit ( 19 ) comprising an air inlet ( 20 ), formed in the air inlet compartment ( 11 ), and an air outlet ( 21 ).

2. The apparatus according to claim 1 , characterized in that the first half-casing ( 1 a ) comprises:

at least part of the air inlet compartment ( 11 ),

at least part of the motor compartment ( 3 ),

at least part of the gas outlet compartment ( 14 ), and

the oxygen circuit ( 16 ) comprising the oxygen inlet ( 17 ) and said at least one oxygen outlet ( 18 ).

3. The apparatus according to claim 2 , characterized in that the second half-casing ( 1 b ) comprises:

at least part of the air inlet compartment ( 11 ), and

the venting circuit ( 19 ) comprising the air inlet ( 20 ) and the air outlet ( 21 ).

4. The apparatus according to claim 3 , characterized in that the venting circuit ( 19 ) comprises an air outlet ( 21 ) arranged parallel to the gas supply opening ( 15 ) of the gas outlet compartment ( 14 ).

5. The apparatus according to claim 3 , characterized in that the oxygen circuit ( 16 ) comprises an oxygen inlet ( 17 ) arranged parallel to the air outlet ( 21 ) of the venting circuit ( 19 ).

6. The apparatus according claim 1 , characterized in that the motor compartment ( 3 ) comprises a peripheral wall ( 3 a ) surrounding at least part of the outer housing ( 2 a ) of the micro-blower ( 2 ), thus defining, with said outer housing ( 2 a ), a space ( 22 ) for passage of gas.

7. The apparatus according to claim 6 , characterized in that the oxygen circuit ( 16 ) comprises an oxygen outlet ( 18 ) opening into the gas passage space ( 22 ) situated between the peripheral wall ( 3 a ) of the motor compartment ( 3 ) and the outer housing ( 2 a ) of the micro-blower ( 2 ), so as to feed said space ( 22 ) of the motor compartment ( 12 ) with oxygen and to mix said oxygen there with the air coming from the air inlet compartment ( 11 ).

8. The apparatus according to claim 7 , characterized in that the motorized micro-blower ( 2 ) additionally comprises a volute ( 23 ) defining a wheel compartment ( 27 ) which accommodates a bladed wheel ( 24 ) supported by a motor shaft ( 25 ) driven by the motor contained in the housing ( 2 a ) of the motorized micro-blower ( 2 ), said volute ( 23 ) comprising a volute opening ( 26 ) in fluidic communication with, on the one hand, the gas passage space ( 22 ) and, on the other hand, the wheel compartment ( 27 ).

9. The apparatus according to claim 8 , characterized in that the volute ( 23 ) additionally comprises an outlet opening ( 28 ) in fluidic communication with, one the one hand, the wheel compartment ( 27 ) and, on the other hand, the gas outlet compartment ( 14 ).

10. An installation for supplying respiratory gas to a patient, comprising a respiratory assistance apparatus according to claim 1 , an oxygen source, such as a pressurized oxygen canister, connected fluidically to said respiratory assistance apparatus, a flexible conduit connected fluidically to said respiratory assistance apparatus and fed with gas by said respiratory assistance apparatus, and a respiratory interface fed with gas by said flexible conduit.