Carter K B, Gray W M, Railton R, Richardson W
Department of Clinical Physics and Bio-Engineering, Glasgow.
Anaesthesia. 1988 Dec;43(12):1042-6. doi: 10.1111/j.1365-2044.1988.tb05706.x.
We reviewed the maintenance records of Tec vaporizers which had been in clinical use for up to 4 years. Tec 4s and Enfluratec 3s were found to be extremely reliable, but Fluotec 3s suffered progressively from mechanical and calibration problems. Their most recurrent fault was sticking valves caused probably by thymol crystallizing on the valve faces. This fault did not occur with Fluotec 4s, which are designed to prevent liquid agent reaching the valve surfaces. We found, in a study of the effects of thymol accumulation, that only occasional draining of a Fluotec vaporizer is required to keep thymol concentration below the level at which its output is reduced. We conclude that, if regular field calibration checks are carried out as a safety measure, the service interval for Tec vaporizers could be extended beyond Ohmeda's present recommendation of one year.
我们查阅了临床使用长达4年的Tec蒸发器的维护记录。发现Tec 4s和恩氟烷Tec 3s极其可靠，但Fluotec 3s逐渐出现机械和校准问题。它们最常出现的故障是阀门粘连，可能是由于百里酚在阀门表面结晶所致。Fluotec 4s没有出现这种故障，因为其设计可防止液体药剂接触阀门表面。在一项关于百里酚积累影响的研究中，我们发现只需偶尔排放Fluotec蒸发器，就能将百里酚浓度保持在不会降低其输出量的水平以下。我们得出结论，作为一项安全措施，如果定期进行现场校准检查，Tec蒸发器的维修间隔可以延长至超过欧姆达目前建议的一年。
