초록 ▼

A continuous mechanical ventilator system includes a ventilator known in the art, with a pneumatic circuit connectable to the patient and operating in the normal manner. A bag and bag valve are interposed within the pneumatic connection such that when the value is closed, the patient is on full assi

A continuous mechanical ventilator system includes a ventilator known in the art, with a pneumatic circuit connectable to the patient and operating in the normal manner. A bag and bag valve are interposed within the pneumatic connection such that when the value is closed, the patient is on full assisted breathing from the ventilator. When the bag valve is opened, gas from the ventilator passes into the bag from which it may be drawn freely by the patient in an unassisted manner. Electronic controls provide means for varying the proportion of breaths to be assisted by the ventilator to the breaths from the bag which, of course, are unassisted. The exhalation valve normally provided, is normally operatively connected to the ventilator in the usual way, when the device is in the assisted mode. However, during the unassisted mode, the exhalation valve is isolated from the rest of the circuit so that no pressure pulses be fed to the exhalation valve during this time. By utilizing the bag and bag valve, both assisted and unassisted breaths consist of gas from the ventilator with the same amount of humidity and oxygen components.

대표청구항 ▼

In a conventional ventilator which supplies assisted or unassisted breaths to a patient including a pneumatic connection extending from said ventilator, an exhalation valve operatively connected to said pneumatic connection, patient connection means extending from said exhalation valve, an exhalatio

In a conventional ventilator which supplies assisted or unassisted breaths to a patient including a pneumatic connection extending from said ventilator, an exhalation valve operatively connected to said pneumatic connection, patient connection means extending from said exhalation valve, an exhalation valve control line operatively connected between the ventilator and the exhalation valve and means operatively connected to said exhalation valve to monitor exhaled breaths; the improvement comprising an attachment, said attachment comprising means to provide assisted breaths from the ventilator when in an “assisted”mode, means to by-pass breaths from said ventilator when in an “unassisted”mode and means operatively connected to the means to monitor the exhaled breaths whereby the ratio of “assisted”and “unassisted”breaths may be varied within limits, said means to provide “unassisted”breaths including a low resistance bag valve in said pneumatic connection, a bag connected to the bag valve, a one-way valve operatively connected between said bag and said exhalation valve providing one-way flow from said bag to said exhalation valve, the operation of said ventilator including means to open and close said bag valve whereby breaths from said ventilator are conveyed directly to said patient connection means when said bag valve is closed and said ventilator is in the “assisted”mode, and to the bag and thence to said patient connection means as required, when said bag valve is open and said ventilator is in the “unassisted”mode, said means operatively connected to said means to monitor the exhaled Breaths whereby the ratio of “assisted”and “unassisted”breaths may be varied within limits, including a pressure sensor in said exhalation valve control line, a signal generator operatively connected to said pressure sensor and operated thereby each time the exhalation pressure within said control line exceeds a predetermined pressure, assisted breath counter means, and unassisted breath counter means, means operatively connecting said signal generator to said assisted breath counter means when in the “assisted”mode and to said unassisted breath counter means when in the “unassisted”mode, means to vary the ratio of connection of said signal generator to said assisted and unassisted counter means, a bag valve solenoid operatively connected to said bag valve and means to operate said bag valve solenoid operatively extending from said unassisted breath counter means to said solenoid.