Department of Anaesthesia, St. George Hospital, Sydney, Australia.
Intensive Care Unit, Shoalhaven District Memorial Hospital, Nowra, Australia.
Anaesth Intensive Care. 2020 Nov;48(3_suppl):44-47. doi: 10.1177/0310057X20947732. Epub 2020 Nov 22.
An example of the East-Freeman Automatic Vent from Oxford was found in the early anaesthesia equipment collection at St George Hospital, Sydney. It weighs less than 200 g and is representative of a group of miniature ventilators that were described in the 1960s, including the Minivent from South Africa and the Microvent from Canada. All relied on a pressure-operated inflating valve that was described in 1966 by Mitchell and Epstein from Oxford. The ventilators were compact, portable and were powered by the gas supply from the anaesthesia machine or other driving source that distended a reservoir bag. The main problem was that they could stick in the inspiratory phase. This led to pressure in the lungs rising towards the driving pressure. There was a risk of barotrauma to the patient if the system was not promptly disconnected. While theyhad provided an alternative to hand bagging, they were superseded, as more sophisticated and safer ventilators became widely available.
在悉尼圣乔治医院的早期麻醉设备收藏中发现了一个牛津的 East-Freeman 自动呼吸机。它的重量不到 200 克，是 20 世纪 60 年代描述的一组微型呼吸机之一，包括南非的 Minivent 和加拿大的 Microvent。所有这些呼吸机都依赖于由牛津的 Mitchell 和 Epstein 于 1966 年描述的压力操作充气阀。这些呼吸机体积小巧，便于携带，由麻醉机或其他驱动源提供的气体供应驱动储气囊充气。主要问题是它们可能卡在吸气阶段。这会导致肺部压力升高到驱动压力。如果系统没有及时断开，患者有发生气压伤的风险。虽然它们为手袋提供了替代方案，但随着更复杂和更安全的呼吸机广泛应用，它们已被取代。
