Achieving an adequate minute volume through a 2 mm transtracheal catheter in simulated upper airway obstruction using a modified industrial ejector A.E.W.

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Achieving an adequate minute volume through a 2 mm transtracheal catheter in simulated upper airway obstruction using a modified industrial ejector A.E.W. Hamaekers, T. Götz, P.A.J. Borg, D. Enk British Journal of Anaesthesia Volume 104, Issue 3, Pages 382-386 (March 2010) DOI: 10.1093/bja/aep391 Copyright © 2010 The Author(s) Terms and Conditions

Fig 1 An industrial ejector with a 0.7 mm ID jet orifice (SBP 07, J. Schmalz GmbH; length 45 mm without the silencer, weight 7.5 g) was modified into an EVA device. British Journal of Anaesthesia 2010 104, 382-386DOI: (10.1093/bja/aep391) Copyright © 2010 The Author(s) Terms and Conditions

Fig 2 (a) The EVA device: the silicone oxygen tubing (1) is connected to the ejector's inlet. The silencer has been removed from the outlet (2) to allow closure by a finger for redirecting the flow to the side port (3). A T-piece (4) with an extra 4 mm side hole (shown by the black circle) is attached to the side port as a bypass and functions as an on–off switch to control gas flow through the connecting tubing (5). The side port of the T-piece covered by a cap is intended for capnometry (not a part of this study). (b) Computed tomographic (CT) scan of the EVA device showing also the interior of the industrial ejector. The numbers indicate identical parts as in (a). The scatter in the CT scan is caused by the metal sealings at the inlet and the side port of the ejector. British Journal of Anaesthesia 2010 104, 382-386DOI: (10.1093/bja/aep391) Copyright © 2010 The Author(s) Terms and Conditions