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COVID-19 WashU/BJC Maker Task Force (MTF)
Face Shields, Masks & PAPRs
Face Shields
"The WashU Shield" (download design files), developed in the Spartan Light Metal Products Makerspace, is the preferred design when standard issued ones are not available.
A WashU designed strap adapter for 3D printed face shields has been approved by the NIH for emergency use. https://3dprint.nih.gov/discover/3dpx-014017
Related news stories:
- McKelvey Engineering staff creating face shields for health care workers
- 3D printers inside closed schools are working overtime to make masks
It is a modification of a design posted by the 3D printer maker PRUSA. The modifications:
- Make it faster to fabricate on standard 3D printers and laser cutters
- Provide slightly more flexibility for comfort
- Extend lateral coverage of the face shields
- Include a shield and visor attached inside the head band frame to prevent exposed holes in shield
- Adds curved top “visor” piece that bends to fit against different forehead shapes for droplet protection from above
- Includes an adjustable head strap
- Enable shield to be completely wiped or washed for reuse.
The following designs have already been approved by the NIH 3D print exchange.
- NIH 3D Printable Headband for Face Shield
- Surgical Mask Tension Release Band for Ear Comfort & Extended Use
Cloth & Isolation Masks
The Maker Task Force sent two mask prototypes to BJC Supply Chain for manufacturer review and contracting. One is a simple isolation-style mask and the other is a simple duckbill-style mask. After clinical evaluation, the duckbill was chosen as the preferred style as it allows for easier breathing.
Aside from the shelf-ready prototypes, the Maker Task Force identified a local manufacturer to produce 70,000 cloth masks in order to provide each BJC employee with two masks.
For both masks, at least two layers were recommended, preferably three. Combination suggestions:
- 2 layers: Layer 1=polyester crepe with textured filament yarn, Layer 2: 100% linen
- 2 layers: Layer 1= polyester crepe with textured filament yarn, Layer 2: Pellon polyester fiberweb
- 3 Layers: Layer 1=polyester crepe with textured filament yarn, Layer 2: Pellon polyester
Disinfection
The Disinfection subgroup implemented a process to disinfect disposable N95 respirator masks that allow health care workers to reuse their own masks for up to 20 cycles using vaporized hydrogen peroxide. The group disinfected 3000+ N95 masks in the weeks following the COVID-19 outbreak and has the capability of disinfecting up to 1,500 masks daily.
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