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A modified expiratory valve for teaching
1Shackleton Department of Anaesthetics, Southampton General Hospital.
Anaesthesia
|May 1, 1989
Abstract:
The shrouding of anaesthetic expiratory valves prevents the anaesthetist from either seeing valve disc movement or hearing clearly the escape of gas during expiration. A modification to one type of valve (Medishield II) is described which replaces this lost information by providing a direct indication of valve opening.