Automatic bellows refill

An anesthesia system having a ventilator having an inspiratory cycle for providing a breathing gas to a patient through a patient breathing circuit and an expiratory cycle where the patient exhales, a gas mixer adapted to supply fresh gas to said patent circuit at a set inspired composition and at a first flow rate, said system comprising means to sense a leak in the patient breathing circuit, means to reduce the flow rate of said gas from said gas mixer upon detection of a leak to a second lower flow rate, means to sense when said patient breathing circuit is refilling, and means to increase the flow to a flow substantially higher than said first flow rate of fresh gas to said patient breathing circuit at said set inspired composition to rapidly refill said patient breathing circuit.

An anesthesia system having a ventilator having an inspiratory cycle for providing a breathing gas to a patient through a breathing circuit and an expiratory cycle where the patient exhales, said system having a bellows that collapses to force gas to the patient during said inspiratory cycle and expands to a maximum expansion during the expiratory cycle, said bellows further comprising a pressure actuated valve communicating with the interior of said bellows and said pressure actuated valve is adapted to open to vent gas from said bellows when a predetermined differential pressure is attained across said valve, said system including means to detect a leak in said patient circuit by monitoring the amount of said maximum expansion of said bellows, said means comprising a flow detector adapted to monitor flow from said pressure actuated valve.

An anesthesia system having a ventilator having an inspiratory cycle for providing a breathing gas to a patient through a breathing circuit and an expiratory cycle where the patient exhales, said system having a bellows that collapses to force gas to the patient during said inspiratory cycle and expands to a maximum expansion during the expiratory cycle, said bellows further comprising a pressure actuated valve communicating with the interior of said bellows and said pressure actuated valve is adapted to open to vent gas from said bellows when a predetermined differential pressure is attained across said valve, said system including means to detect a leak in said patient circuit by monitoring the amount of said maximum expansion of said bellows, said means comprising a sensor to determine when said pressure actuated valve has opened.

An anesthesia system having a ventilator having an inspiratory cycle for providing a breathing gas to a patient through a breathing circuit and an expiratory cycle where the patient exhales, said system having a bellows that collapses to force gas to the patient during said inspiratory cycle and expands to a maximum expansion during the expiratory cycle, said bellows further comprising a pressure actuated valve communicating with the interior of said bellows and said pressure actuated valve is adapted to open to vent gas from said bellows when a predetermined differential pressure is attained across said valve, said system including means to detect a leak in said patient circuit by monitoring the amount of said maximum expansion of said bellows, and means to detect the correction of a leak by monitoring the expansion of said bellows, said means to detect the correction of a leak comprising a sensor to determine when said valve has opened.

An anesthesia system having a ventilator having an inspiratory cycle for providing a breathing gas to a patient through a breathing circuit and an expiratory cycle where the patient exhales, said system having a bellows that collapses to force gas to the patient during said inspiratory cycle and expands to a maximum expansion during the expiratory cycle, said bellows further comprising a pressure actuated valve communicating with the interior of said bellows and said pressure actuated valve is adapted to open to vent gas from said bellows when a predetermined differential pressure is attained across said valve, said system including means to detect a leak in said patient circuit by monitoring the amount of said maximum expansion of said bellows, and means to detect the correction of a leak by monitoring the expansion of said bellows, said means to detect the correction of a leak comprising a flow detector adapted to monitor flow from said pressure actuated valve.