Endoscopy 2021; 53(06): E238-E239
DOI: 10.1055/a-1308-0778

Novel mouth guard for safe endoscopy in the COVID era

Sachin Dev Munjal
1  Department of Gastroenterology, Gastro Liver Care Hospital, Saharanpur, Uttar Pradesh, India
Yogita Munjal
2  Department of Histopathology, Gastro Liver Care Hospital, Saharanpur, Uttar Pradesh, India
› Author Affiliations

COVID-19 is a disease caused by a novel coronavirus (SARS-CoV-2), which is chiefly transmitted through respiratory secretions, aerosols, and contaminated surfaces [1].

Endoscopy is an aerosol-generating procedure and thus carries a significant risk of transmission of aerosol-borne diseases to the endoscopist and staff [2]. During endoscopic procedures, a wide open space is left between the mouth guard and the endoscope, through which large quantities of aerosols escape, increasing the risk of infection.

We have made a few changes in the mouth guard to prevent exposure to aerosols and allow endoscopy to be carried out safely. The elements of the novel mouth guard are: a standard mouth guard, a baby feeding bottle, a feeding bottle nipple, and a triple-layer mask ([Video 1]).

Video 1 Novel mouth guard for safe endoscopy.


Take a plastic feeding bottle and cut off the upper end at the neck. Fix this upper end of the bottle to the mouth guard ([Fig. 1]). Then take the nipple and make a small slit across its top ([Fig. 2]). Invert the nipple ([Fig. 3]), place it in the bottle neck, and screw down the collar tightly ([Fig. 4]). Then take a surgical mask, cut a hole in the middle of it, and fix the assembly into the mask ([Fig. 5]).

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Fig. 1 Attach the upper part of a baby’s feeding bottle to the mouth guard.
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Fig. 2 A silicon nipple with a slit functions as a valve.
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Fig. 3 Invert the nipple into the bottle neck and screw down the collar.
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Fig. 4 Perspective view of the novel mouth guard.
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Fig. 5 Novel mouth guard in place in a triple-layer mask, ready for use.

Place the novel mouth guard inside the patient’s mouth and perform endoscopy with all due precautions and necessary protective equipment. The nipple inside the device acts as a perfect valve and prevents aerosols from escaping ([Video 1]). We have been able to carry out both diagnostic and therapeutic endoscopies with these changes. We have demonstrated the efficacy of our device by performing a simple experiment simulating endoscopy and aerosol generation ([Video 1]).

Our device is cheap, easy to make, reusable, and allows us to do endoscopy more safely during this COVID era.


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Publication History

Publication Date:
17 December 2020 (online)

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