Copyright © Françoise Herrmann
In response to the shortage of Personal Protection Equipment (PPE), within the context of the COVID 19 pandemic, Google designed, manufactured and donated 49,000 face shields to medical personnel (Li, April 28, 2020). A prototyped design that was subsequently shared with manufacturers, converting their production pipelines to meet the demands for millions of PPE units.
In the R&D tradition, the project was authorized
by the FDA, researched, prototyped and field-tested. Contrary to clearance for
medical use, the FDA authorized the use of the Google-designed COVID19 face
shields for medical personnel, under an Emergency Use Authorization.
This means that use of the COVID 19 face shields is actually valid, only during those
circumstances that justify the declared State of Emergency. Pursuant to the specification
of the limitations of liability, the shields have not been tested or evaluated in
any way for their capacity to filter, reduce or kill any viruses, bacteria or
fungi. They are provided as a free
service.
Following survey of existing face shields and feedback from clinicians, the Google COVID19 face shields were designed as disposable, single use, PPE in clinical settings, for the purposes of shielding eyes and face, from bodily fluids or liquid splashes. The design comprises three parts:
- a 1" thick x .75" wide x 9" long polyurethane foam strip
- PET film, cut to specification for the visor, that does not fog or become opaque when wiped with a sanitizer, and
- a rubber band, girth hitched through the tab hole on one side of the visor, and stapled on the other.
Assembly also requires double-sided tape to attach the foam strip, and a stapler
to secure the rubber band with a staple, facing away from the user’s head.
The Google COVID 19 face shields were designed as single-use, and disposable, in clinical settings, per clinician request. Use of the 9" foam strip, flush with the full-width of the user’s forehead, was designed to prevent droplets from entering the face shield from above, whereas the 1" thickness of the foam strip was designed to provide distance between the shield and the user’s face. The distance is required, since the face shields are designed for use with an FDA-compliant Respiratory Protective Device (RPD) or mask, worn behind the shield. The visor extends from ear to ear, without covering ears, so that hearing is not obstructed. The visor also extends below the chin, measuring about 9 to 10 inches from top to bottom.
Specifications for fabricators are found in the Google Trestle Guide, referenced below.
References
Google Trestle guide
file:///E:/Users/Administrator/Pictures/TrestleGuide.pdf
Li, A. (April 28, 2020) Google Assembles 49,000 face shields to help
its local community. 9to5 Google
https://9to5google.com/2020/04/28/google-donates-face-shields/
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