| 摘要 |
The invention concerns a breathing system which may be suitable for making measurements on the gases expired by a subject, or the gases to be delivered to a subject for inspiration. The system may also be suitable for delivering gases and volatile agents to a subject, for instance to a patient undergoing anaesthesia. The system includes an expiration chamber (2) to receive expired gas from a subject, a middle chamber (3) and an inspiration chamber (4) from which gas passes to the subject. The three chambers are arranged in series so that air received from the subject passes through each chamber in turn. A gas analyser (21) is arranged to measure samples from the middle chamber (3). There are valves between the chambers and between the middle chamber (3) and the analyser (21), and a valve controller controls the valves during each cycle of expiration and inspiration such that the middle chamber (3) is isolated from the other chambers for at least one period of time in each cycle to allow the analyser (21) to measure samples from the middle chamber (3) while the subject is able to continue to breathe without interruption. In another aspect the invention concerns breathing methods using the system. |
