Respiratory device

1. A respiratory device ( 1 ) for supplying a patient with respiratory air, having an oxygen inlet ( 2 ) for connecting to an oxygen supply and a compressed air inlet ( 4 ) for connecting to a compressed air supply, the respiratory device ( 1 ) comprising:

a metering valve ( 7 ) for metering the supplied oxygen via the oxygen inlet ( 2 ),

a turbine ( 9 ) for aspirating ambient air,

a first pressure sensor ( 5 ) associated with the oxygen inlet ( 2 ) and configured to monitor a prevailing pressure at the oxygen inlet ( 2 ), and

a second pressure sensor ( 6 ) associated with the compressed air inlet ( 4 ) and configured to monitor a prevailing pressure at the compressed air inlet ( 4 ),

a control unit including a control loop, wherein the metering valve ( 7 ) and the turbine ( 9 ) are connected via the control loop to the first pressure sensor ( 5 ) for measuring the oxygen pressure, and to the second pressure sensor ( 6 ) for measuring the air pressure,

wherein the metering valve ( 7 ) and the turbine ( 9 ) are controlled as a function of the measured oxygen pressure and the measured air pressure, and upon a pressure drop at the oxygen inlet ( 2 ) and/or the compressed air inlet ( 4 ) the control unit automatically switches on the turbine ( 9 ).

2. The respiratory device ( 1 ) according to claim 1 , wherein the respiratory device ( 1 ) has a mixing chamber ( 13 ) and oxygen from the oxygen supply is mixed with the ambient air aspirated by the turbine ( 9 ) in the mixing chamber ( 13 ).

3. The respiratory device ( 1 ) according to claim 1 , wherein oxygen from the oxygen supply and the ambient air aspirated by the turbine ( 9 ) or compressed air from a compressed air supply are mixed in an outlet duct ( 23 ) of the respiratory device ( 1 ).

4. The respiratory device ( 1 ) according to claim 3 , wherein a flow rate and/or the pressure of the aspirated ambient air is regulated by a speed of the turbine ( 9 ).

5. The respiratory device ( 1 ) according to claim 4 , wherein the respiratory device ( 1 ) operates in a first operating mode or in a second operating mode, in the first operating mode the turbine ( 9 ) aspirates ambient air and no compressed air is supplied and in the second operating mode compressed air is supplied from the compressed air supply and the turbine ( 9 ) switched off.

6. The respiratory device ( 1 ) according to claim 5 , wherein the respiratory device ( 1 ) operates in a third operating mode, and in the third operating mode the turbine ( 9 ) is switched off and the compressed air supply is closed.

7. The respiratory device ( 1 ) according to claim 6 , wherein the operating mode is automatically selected according to a predetermined priority and the respiratory device includes a manual selection to allow a user to cancel an automatic selection.

8. The respiratory device ( 1 ) according to claim 7 , wherein in the first and second operating modes oxygen is supplied via the oxygen inlet ( 2 ).

9. The respiratory device ( 1 ) according to claim 8 , wherein adjustments of a pressure, a flow pattern and/or a volume of the air aspirated by the turbine ( 9 ) are controlled by a microprocessor, and adjustments are adapted to be performed manually by a user or are automatically preset by a selected artificial respiration mode.

10. The respiratory device ( 1 ) according to claim 9 , wherein the respiratory device ( 1 ) has a metering valve ( 7 ) for metering the supplied oxygen via the oxygen inlet ( 2 ), the metering valve ( 7 ) and the turbine ( 9 ) are connected via a control loop to a first flow rate meter ( 11 ) for measuring an oxygen flow rate and to a second flow rate meter ( 12 ) for measuring an air flow rate, and wherein the metering valve ( 7 ) and the turbine ( 9 ) are configured to be controlled as a function of the measured oxygen flow rate and/or the measured air flow rate.

11. The respiratory device ( 1 ) according to claim 10 , wherein the respiratory device ( 1 ) has a check valve ( 10 ) permitting a flow of air from the turbine ( 9 ) toward the patient and a spontaneous respiration during an exhalation phase and prevents a flow of air toward the turbine ( 9 ).

12. The respiratory device ( 1 ) according to claim 11 , wherein the respiratory device ( 1 ) has an emergency evacuation device ( 14 , 15 ) allowing an excess pressure in the respiratory device ( 1 ) to be discharged.

13. The respiratory device ( 1 ) according to claim 12 , wherein the respiratory device ( 1 ) has a venturi nozzle ( 24 ) configured so the oxygen from the oxygen inlet ( 2 ) flows through the venturi nozzle ( 24 ) and produces a negative pressure so ambient air is aspirated and is supplied for mixing with the oxygen.

14. The respiratory device ( 1 ) according to claim 13 , wherein in the third operating mode, a supply of air is provided exclusively by the ambient air aspirated via the venturi nozzle ( 24 ).

15. The respiratory device ( 1 ) according to claim 1 , wherein a flow rate and/or the pressure of the aspirated ambient air is regulated by a speed of the turbine ( 9 ).

16. The respiratory device ( 1 ) according to claim 1 , wherein the respiratory device ( 1 ) operates in a first operating mode or in a second operating mode, in the first operating mode the turbine ( 9 ) aspirates ambient air and no compressed air is supplied and in the second operating mode compressed air is supplied from the compressed air supply and the turbine ( 9 ) switched off.

17. The respiratory device ( 1 ) according to claim 5 , wherein the operating mode is automatically selected according to a predetermined priority and the respiratory device includes a manual selection to allow a user to cancel an automatic selection.

18. The respiratory device ( 1 ) according to claim 5 , wherein in the first and second operating modes oxygen is supplied via the oxygen inlet ( 2 ).

19. The respiratory device ( 1 ) according to claim 1 , wherein adjustments of a pressure, a flow pattern and/or a volume of the air aspirated by the turbine ( 9 ) are controlled by a microprocessor, and adjustments are adapted to be performed manually by a user or are automatically preset by a selected artificial respiration mode.

20. The respiratory device ( 1 ) according to claim 1 , wherein the respiratory device ( 1 ) has a metering valve ( 7 ) for metering the supplied oxygen via the oxygen inlet ( 2 ), the metering valve ( 7 ) and the turbine ( 9 ) are connected via a control loop to a first flow rate meter ( 11 ) for measuring an oxygen flow rate and to a second flow rate meter ( 12 ) for measuring an air flow rate, and wherein the metering valve ( 7 ) and the turbine ( 9 ) are configured to be controlled as a function of the measured oxygen flow rate and/or the measured air flow rate.

21. The respiratory device ( 1 ) according to claim 1 , wherein the respiratory device ( 1 ) has a check valve ( 10 ) permitting a flow of air from the turbine ( 9 ) toward the patient and a spontaneous respiration during an exhalation phase and prevents a flow of air toward the turbine ( 9 ).

22. The respiratory device ( 1 ) according to claim 1 , wherein the respiratory device ( 1 ) has an emergency evacuation device ( 14 , 15 ) allowing an excess pressure in the respiratory device ( 1 ) to be discharged.

23. The respiratory device ( 1 ) according to claim 1 , wherein the respiratory device ( 1 ) has a venturi nozzle ( 24 ) configured so the oxygen from the oxygen inlet ( 2 ) flows through the venturi nozzle ( 24 ) and produces a negative pressure so ambient air is aspirated and is supplied for mixing with the oxygen.

24. The respiratory device ( 1 ) according to claim 1 , further comprising:

a flow rate meter ( 12 ) for measuring an air flow rate from the compressed air inlet ( 4 ) and/or the turbine ( 9 ), wherein the metering valve ( 7 ) and the turbine ( 9 ) are further controlled as a function of the measured air flow rate, and

the turbine ( 9 ) connected between the second pressure sensor ( 6 ) and the flow rate meter ( 12 ) via a check valve ( 10 ), wherein the check valve ( 10 ) permits a flow of air from the turbine ( 9 ) toward the patient and a spontaneous respiration during an exhalation phase and prevents a flow of air toward the turbine ( 9 ).

25. The respiratory device ( 1 ) according to claim 24 , further comprising:

a compressed air duct ( 21 ) extending from the compressed air inlet ( 4 ),

the flow rate meter ( 12 ) measuring the air flow rate in the compressed air duct ( 21 ), and

the turbine ( 9 ) connected to the compressed air duct ( 21 ) between the second pressure sensor ( 6 ) and the flow rate meter ( 12 ) via the check valve ( 10 ).