Leibundgut D, Zbinden A M
Research Section, Institute of Anaesthesiology and Intensive Care, University Hospital of Bern, Switzerland.
Anaesthesia. 1995 Dec;50(12):1065-9. doi: 10.1111/j.1365-2044.1995.tb05953.x.
Based on a new preliminary standard of the 'Comité Européen de Normalisation', the following unidirectional valves were tested with regard to resistance, opening pressure, reverse flow and dislocation: the Dräger inspiratory and expiratory valves, the Engström inspiratory valve, the Ohmeda valve, the Siemens Ventilator 710 inspiratory and expiratory valves, the Siemens Ventilator 900C unidirectional valve of the absorber and the Megamed 700 inspiratory and expiratory valves of the circle system 219 (Megamed 700 CS 219). The following valves fulfilled all Comité Européen de Normalisation requirements: Dräger inspiratory and expiratory valves, Siemens 900 absorber valve and Megamed 700 CS 219 inspiratory valve. The Siemens 710 valve and the Megamed 700 CS 219 expiratory valve did not meet the requirements for flow resistance. The Ohmeda and Siemens 710 valves and the Engström inspiratory valve did not fulfil the Comité Européen de Normalisation requirements for reverse flow. In addition, the Engström inspiratory valve did not comply with the dislocation test. The requirements for the opening pressure were met by all the valves tested. Valves with the disc in a horizontal position achieved better results than those with the disc in a vertical position. These measurements, showing the differences in the performance of various types of valves confirm the feasibility of the standards proposal.
根据“欧洲标准化委员会”的一项新的初步标准，对以下单向阀进行了阻力、开启压力、逆流和位移方面的测试：德尔格吸气和呼气阀、恩斯特龙吸气阀、奥米达阀、西门子710型呼吸机吸气和呼气阀、西门子900C型呼吸机吸收器单向阀以及美加德700型循环系统219（美加德700 CS 219）的吸气和呼气阀。以下阀门符合欧洲标准化委员会的所有要求：德尔格吸气和呼气阀、西门子900型吸收器阀和美加德700 CS 219吸气阀。西门子710型阀和美加德700 CS 219呼气阀不符合流动阻力要求。奥米达阀、西门子710型阀和恩斯特龙吸气阀不符合欧洲标准化委员会关于逆流的要求。此外，恩斯特龙吸气阀不符合位移测试要求。所有测试阀门均满足开启压力要求。阀盘处于水平位置的阀门比阀盘处于垂直位置的阀门取得了更好的结果。这些测量结果显示了不同类型阀门性能的差异，证实了标准提案的可行性。
