System and method for ventilating lungs

Abstract

A system for ventilating lungs of a subject is disclosed herein. The system includes a control unit configured to control operation of the system. The system also includes a machine ventilator circuit configured to assist the breathing functions of the subject, the machine ventilator circuit includes an inspiration delivery unit, and an expiration circuit. The system also includes a manual ventilation circuit comprising a manual bag guiding a gas from the manual bag wherein a gas flow is guided out from the manual bag to assist an inspiration phase, a gas flow is received to fill the manual bag during an expiration phase, and wherein the gas flow received to fill the manual bag during the expiration phase at least partially comprises the gas flow guided to assist the inspiration phase

1 - 20 . (canceled) 
     
     
         21 . A system for ventilating lungs of a subject, the system comprising:
 a control unit configured to control operation of the system;   a machine ventilator circuit configured to assist breathing functions of the subject, the machine ventilator circuit comprising an inspiration delivery unit and an expiration circuit; and   a manual ventilation circuit comprising:
 a manual bag, wherein a gas flow is guided out from the manual bag to assist an inspiration phase, a gas flow is received to fill the manual bag during an expiration phase, and wherein the gas flow received to fill the manual bag during the expiration phase at least partially comprises the gas flow guided to assist the inspiration phase; and 
 a sensor, wherein the sensor is configured to detect a flow direction inside the manual ventilation circuit and to provide a signal to the control unit based on the detected flow direction. 
   
     
     
         22 . The system according to  claim 21 , wherein the machine ventilator circuit and the manual ventilation circuit can be alternatively selected. 
     
     
         23 . The system according to  claim 21 , wherein the expiration circuit comprises an expiration valve. 
     
     
         24 . The system according to  claim 23 , wherein the control unit is configured to identify whether the inspiration phase or the expiration phase is active and to guide the expiration valve based on the detected flow direction. 
     
     
         25 . The system according to  claim 23 , wherein the control unit guides the expiration valve to a closed position when the inspiration phase is active. 
     
     
         26 . The system according to  claim 23 , wherein the control unit guides the expiration valve to a closed position when the expiration phase is active, and wherein the control unit further guides the expiration valve to an open position when a predetermined pressure is reached in the manual bag. 
     
     
         27 . The system according to  claim 21  further comprising:
 a user interface for entering information while ventilating the subject. 
 
     
     
         28 . The system according to  claim 21 , wherein direct pneumatic contact is made between the manual bag and the gas flow received to fill the manual bag during the expiration phase. 
     
     
         29 . The system according to  claim 21  further comprising:
 a gas mixer configured to supply fresh gas to the subject and a breathing circuit connecting lungs of the subject and the machine ventilator circuit to exchange gas in the lungs. 
 
     
     
         30 . The system according to  claim 29 , wherein the gas flow received to fill the manual bag during the expiration phase further comprises at least one of the fresh gas supplied by the gas mixer and a gas flow delivered by the inspiration delivery unit, and wherein direct pneumatic contact is made between the manual bag and the gas flow received to fill the manual bag during the expiration phase. 
     
     
         31 . The system according to  claim 21 , wherein the sensor is a flow sensor. 
     
     
         32 . The system according to  claim 21 , wherein the sensor is a first pressure sensor, and the system further comprises a second pressure sensor disposed outside the manual ventilation circuit,
 wherein the second pressure sensor detects a pressure outside the manual ventilation circuit and provides a signal to the control unit based on the pressure outside the manual ventilation circuit, and   wherein the control unit uses the signal from the first pressure sensor and the signal from the second pressure sensor to determine a pressure difference between the two detected pressures.   
     
     
         33 . A method for ventilating lungs of a subject with a system comprising a control unit configured to control operation of the system, a machine ventilator circuit configured to assist breathing functions of the subject and a manual ventilation circuit comprising a manual bag and a sensor, the method comprising:
 increasing pressure to guide a gas flow to assist an inspiration phase by using the control unit to compress the manual bag;   guiding, with the control unit, a gas flow that at least partially comprises the gas flow guided to assist the inspiration phase to fill the manual bag during an expiration phase;   detecting a flow direction inside the manual ventilation circuit with the sensor;   producing a signal, with the sensor, based on the detected flow direction; and   guiding, with the control unit, a discharge of extra gas volume based on the detected flow direction, wherein the extra gas volume is discharged during the expiration phase in order to reach a pressure level of an expiratory pressure, and wherein the extra gas volume is discharged during the inspiration phase in order to limit the pressure level to an inspiratory pressure.   
     
     
         34 . The method according to  claim 33 , wherein the signal based on the detected flow direction provides information about when the inspiration phase is active and when the expiration phase is active. 
     
     
         35 . The method according to  claim 33  further comprising setting a predetermined pressure level for the expiratory pressure and setting a predetermined pressure level for limiting an inspiratory pressure. 
     
     
         36 . The method according to  claim 33 , wherein filling the manual bag during the expiration phase with a gas flow that at least partially comprises the gas flow guided to assist the inspiration phase creates direct pneumatic contact between the manual bag and the gas flow received to fill the manual bag during the expiration phase 
     
     
         37 . The method according to  claim 33 , further comprising supplying a gas flow of fresh gas to the subject. 
     
     
         38 . The method according to  claim 37 , wherein filling the manual bag during an expiration phase further comprises the gas flow of fresh gas. 
     
     
         39 . The method according to  claim 33 , wherein the machine ventilator circuit and the manual ventilation circuit can be alternatively selected. 
     
     
         40 . The method according to  claim 39 , wherein the manual ventilation circuit is in gas flow connection with at least a part of the machine ventilator circuit to create a pneumatic contact with the lungs of the subject when the manual ventilation circuit is selected, and the manual ventilation circuit being in gas flow connection with an expiration circuit to achieve a predetermined pressure level under the control of the control unit, the method further comprises:
 increasing pressure by compressing the manual bag to guide a gas flow to assist an inspiration phase in the manual ventilation circuit and in a part of the machine ventilator circuit in flow communication with the manual ventilation circuit; and   releasing the manual bag for an expiration phase.   
     
     
         41 . The method according to  claim 40  further comprising setting a predetermined pressure level for the expiratory pressure and setting a predetermined pressure level for limiting an inspiratory pressure. 
     
     
         42 . The method according to  claim 40 , wherein filling the manual bag during the expiration phase with a gas flow that at least partially comprises the gas flow guided to assist the inspiration phase creates direct pneumatic contact between the manual bag and the gas flow received to fill the manual bag during the expiration phase.