CC BY-NC-ND 4.0 · Endosc Int Open 2021; 09(03): E443-E449
DOI: 10.1055/a-1336-2766
Original article

Intraluminal gas escape from biopsy valves and endoscopic devices during endoscopy: caution advised during the COVID-19 era

Shinya Urakawa
1   Department of Surgery, Weill Cornell Medicine/New York Presbyterian Hospital, New York, New York, United States
2   Department of Next Generation Endoscopic Intervention (Project ENGINE), Osaka University Graduate School of Medicine, Osaka, Japan
,
Teijiro Hirashita
1   Department of Surgery, Weill Cornell Medicine/New York Presbyterian Hospital, New York, New York, United States
,
Kota Momose
3   Department of Surgery, Kindai University Faculty of Medicine, Osaka, Japan.
,
Makoto Nishimura
4   Gastroenterology, Hepatology and Nutrition Service, Memorial Sloan Kettering Cancer Center, New York, New York, United States
,
Kiyokazu Nakajima
2   Department of Next Generation Endoscopic Intervention (Project ENGINE), Osaka University Graduate School of Medicine, Osaka, Japan
,
Jeffrey W. Milsom
1   Department of Surgery, Weill Cornell Medicine/New York Presbyterian Hospital, New York, New York, United States
› Author Affiliations

Abstract

Background and study aims The risk of aerosolization of body fluids during endoscopic procedures should be evaluated during the COVID-19 era, as this may contribute to serious disease transmission. Here, we aimed to investigate if use of endoscopic tools during flexible endoscopy may permit gas leakage from the scope or tools.

Material and methods Using a fresh 35-cm porcine rectal segment, a colonoscope tip, and manometer were placed intraluminally at opposite ends of the segment. The colonoscope handle, including the biopsy valve, was submerged in a water bath. Sequentially, various endoscopic devices (forceps, clips, snares, endoscopic submucosal dissection (ESD) knives) were inserted into the biopsy valve, simultaneously submerging the device handle in a water bath. The bowel was slowly inflated up to 74.7 mmHg (40 inH2O) and presence of gas leakage, leak pressure, and gas leakage volume were measured.

Results Gas leakage was observed from the biopsy valve upon insertion and removal of all endoscopic device tips with jaws, even at 0 mmHg (60/60 trials). The insertion angle of the tool affected extent of gas leakage. In addition, gas leakage was observed from the device handles (8 of 10 devices) with continuous gas leakage at low pressures, especially two snares at 0 mmHg, and an injectable ESD knife at 0.7 ± 0.8 mmHg).

Conclusions Gas leakage from the biopsy valve and device handles commonly occur during endoscopic procedures. We recommend protective measures be considered during use of any tools during endoscopy.

Supplementary material



Publication History

Received: 06 August 2020

Accepted: 23 November 2020

Article published online:
19 February 2021

© 2021. The Author(s). This is an open access article published by Thieme under the terms of the Creative Commons Attribution-NonDerivative-NonCommercial License, permitting copying and reproduction so long as the original work is given appropriate credit. Contents may not be used for commecial purposes, or adapted, remixed, transformed or built upon. (https://creativecommons.org/licenses/by-nc-nd/4.0/)

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