초록 ▼

A system is provided for detecting the breakthrough of CO2 into the inspiratory limb of a substantially closed circle patient breathing circuit having a CO2 absorber to remove CO2 from the continuously recirculating gases. The CO2 is detected by a gas analyzer located in the inspiratory limb of the

A system is provided for detecting the breakthrough of CO2 into the inspiratory limb of a substantially closed circle patient breathing circuit having a CO2 absorber to remove CO2 from the continuously recirculating gases. The CO2 is detected by a gas analyzer located in the inspiratory limb of the patient breathing circuit. Upon detection of that CO2, the system increases the flow of fresh gas into the circle patient breathing circuit to a flow rate in excess of the minute volume of gas being delivered at that time to the patient. The increased flow of fresh gas basically prevents the further flow of CO2 from the expiratory limb into the inspiratory limb, thus preventing the CO2 from being inhaled by the patient.

대표청구항 ▼

An anesthesia system for providing anesthesia to a patient, comprising; a substantially closed patient circuit adapted to be connected to the patient, said patient circuit having an inspiratory limb for introducing gases into the patient and an expiratory limb for receiving gases exhaled by the pati

An anesthesia system for providing anesthesia to a patient, comprising; a substantially closed patient circuit adapted to be connected to the patient, said patient circuit having an inspiratory limb for introducing gases into the patient and an expiratory limb for receiving gases exhaled by the patient and wherein gases circulate through said patient circuit, check valve means in said patient circuit to allow flow within said circuit only in the direction from said expiratory limb into said inspiratory limb, an absorber in said substantially closed patient circuit for removing CO2 from the gases circulating within said substantially closed patient circuit, means to supply a gas into said substantially closed patient circuit to provide a breath at a known minute volume to be delivered to the patient through said substantially closed patient circuit, means to introduce fresh anesthetic gas at a controllable flow rate into said substantially closed patient circuit at an inlet in said substantially closed patient circuit, a gas monitor to detect the presence of CO2 in said inspiratory limb during the inspiratory phase of respiration, means responsive to the detection of CO2 by said gas monitor to increase the flow rate of the fresh gas into said substantially closed patient circuit to a predetermined increased flow rate that exceeds the known minute volume of gas supplied to the patient, said increased flow of fresh gas effectively blocking the flow of gas from said expiratory limb into said inspiratory limb to suppress the passage of CO2 from said expiratory limb into said inspiratory limb, and pop-off valve means located in said substantially closed patient circuit between the point where said expiratory limb receives gases from the patient and said inlet for the introduction of fresh gases into said substantially closed patient circuit to exhaust gases from said substantially closed patient circuit.