| 摘要 |
In preventing a patient from being administered an erroneous anaesthetic, an incorrect concentration of anaesthetic or a mixture of anaesthetics, it would be advantageous if anaesthetic system were equipped with a device capable of identifying anaesthetics in anaesthetic system. A device (66) is described for simple and reliable identification of anaesthetics in a novel way. The device (66) identifies anaesthetics by having a thermal element (74) vary the temperature of at least some of the anaesthetic so it undergoes a change in state between two states of aggregation, e.g. condensation from the gaseous state to the liquid state, determining a transition temperature for the change in state and identifying the anaesthetic from the determined transition temperature. The condensation point temperature can be determined by sensing the capacitance between two conductors (72A, 72B) or sensing changes in the resonance of an oscillating crystal (82). <IMAGE> |
