| 摘要 |
An anesthetic system, primarily intended for a closed breathing circuit, has an inspiratory line, an expiratory line and a connecting line which form a closed gas line system with the inspiratory line and the expiratory line. A first check valve and a second check valve are arranged in the connecting line to control the direction of gas flow in the gas line system. A first gas reservoir and a second gas reservoir are also connected to the connecting line. The gas reservoirs are functionally interconnected so an increase in the volume of one results in a corresponding reduction in the volume of the other, and vice-versa. The changes in volume are actively controlled by a control system. During inspiration, respiratory gas is carried to the patient from a hand ventilator at the same time as respiratory gas is carried from the first gas reservoir to the second gas reservoir. During expiration, respiratory gas is carried from the patient to the first gas reservoir, and respiratory gas from the second gas reservoir is carried to the hand ventilator with a flow of fresh gas from a source of fresh gas. All flows are regulated to make them identical. |
