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. 2020 Jul 2:10.1097/ALN.0000000000003473. doi: 10.1097/ALN.0000000000003473

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Copyright © 2020, the American Society of Anesthesiologists, Inc. All Rights Reserved.

This article is made available via the PMC Open Access Subset for unrestricted re-use and analyses in any form or by any means with acknowledgement of the original source. These permissions are granted for the duration of the COVID-19 pandemic or until permissions are revoked in writing. Upon expiration of these permissions, PMC is granted a perpetual license to make this article available via PMC and Europe PMC, consistent with existing copyright protections.

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Fig. 1. — Split circuit with flow control valves. (A) Circuit as-built. (B) Line drawing of circuit. Note: all components shown are standard breathing circuit components, aside from the three-dimensional printed flow control valves. Image courtesy of Stryker Corporation, USA.