Summary

Viral level protection respirator buildable with 3D printed parts.

Bunny Science PAPR Respirator design by Guy Kuo, MD Anesthesiologist.

This is not a mask, but a PAPR (Powered Air Purifying Respirator). Itextends utility of already FDA approved anesthesia viral filters to create ahighly protective PAPR. As a full head covering PAPR, it protects bothaerosol, droplet, and splash threat from all directions.

Bunny Science PAPR isolates user via positive pressure insteadrequiring a perfect face to mask seal.

Masks which does not form a perfect facial seal is of no use for protectionagainst aerosolized threat. Some simply cannot use an N95 mask becausethey can never pass fit testing for leaks. PAPR's avoid this usage pitfall.

Bunny Science PAPR extends use of approved, viral filters. These areubiquitous in the operating room setting and have safely providedhigher than N95 filtering for many years. Design Highlights

Provide clean breathing air via FDA approved, ventilator viral filter ormedical air/oxygenCOMPLETELY protect entire head and face to airborne and splash risksUses positive pressure to maintain protection even without a perfectsealUse disposables that are readily availableAble to create positive pressure seal even using FDM 3D parts.

Bunny Science

Bunny SciencePAPR

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updated 4. 5. 2020 | published 29. 3. 2020

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Hood is a polyethylene bag placed over head and secured around neck.Breathable environment is at positive pressure. Expiration ports areunidirectional flow valves or additional output filters.

Fan Powered Filtered PAPR - Full PAPR by drawing room air throughanesthesia viral filter via a fan. Fan is powered by 12 volt battery pack orAC adapter.

Developmental Testing

This PAPR has been tested at my hospital against nebulized N95 testaerosols for proper isolation. To simulate worst case test conditions, testaerosol was directed at air intake, exhausts, and neck seal. Although, thisis not identical to NaCl challenge, there is no logical reason to require re-testing of filters already accepted by FDA as having adequate viralfiltering.

Physiologic monitoring for CO2 clearance, oxygen saturation, andrespiratory rate was verified as sustainable using OR patient monitor andcontinuous gas sampling analysis. User ability to wear system for over fourhours was confirmed. Wearer has ability to carry out typical operatingroom procedures, watch monitor, fill out EHR, walk and push gurneys.

Main Project Page https://bunnyscience.dozuki.com/Guide/Bunny+Science+PAPR/4

Detailed clinical, assembly, and function video are now at... https://youtu.be/JMXP8jAmDKA

Most Recent 3D parts files can be downloaded from... https://www.thingiverse.com/thing:4243272 or https://www.prusaprinters.org/prints/27657-bunny-science-papr

The Bunny Science PAPR is not yet a regulatory approved device. Use ofthis PAPR respirator is at your sole discretion and risk.''

Project is released under Creative Commons Attribution-NonCommercial-NoDerivs CC BY-NC-ND.

Art Credit: Generic human head model by John Brown. .

Healthcare > Accessibility

covid virus shield respirator papr mask head

filter face

Model Files (.stl, .3mf, .obj, .amf) DOWNLOAD ALL FILES

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Print in PETG with 0.2 mm layers. 3 perimeters, 4 top/4 bottom layers,20% gyroid fill.

Run nozzle about 5C hotter than usual for better layer to layer seal.

With E3D and brass nozzle, I use 255C 1st layer/other layers 260C forPETG.

With SLICE Mosquito and tungsten carbide nozzle, I use 255C 1st layer/other layers 265C for PETG.

IMPORTANT SLICING SETTING For the bag filter 22 mm adapters thatconnect to a round filter... Set seam positions to RANDOM. Otherwise, yourslicer may align seams and create a vertical seam that can act as amicrochannel between the adapter and filter. Such a vertical channel isvery small, but may reduce seal between filter end and adapter. Settingseams to random avoids creation of a continuous vertical seam.

Post print and usage instructions are at https://bunnyscience.dozuki.com/Guide/Bunny+Science+PAPR/4

CHANGES: Flutter valve B5 changed to elliptical base shape and no longerneeds deflector piece. Align flat of glove finger with long axis of valveellipse.

Fan mounting bands B5 revamped to better distribute mechanicalstresses.

Added optional fan director that mounts between fan and fan flange.Directs airflow downward to improve CO2 clearance.

halo-loop-click-slot-wire-channel-slope-46-b5.stl

bag-filter-alt-outer-22-mm-adapter-b5.stl

bag-filter-standard-inner-22-mm-adapter-b5.stl

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The Author has not uploaded any print files.Try to search in User print files section or generate and upload yourown.

License

This work is licensed under a Creative Commons (4.0 International License)

Attribution—Noncommercial—No Derivates

✖ | Sharing without ATTRIBUTION ✖ | Remix Culture allowed ✖ | Commercial Use

fan-mount-part-a-b5.stl

fan-mount-part-b-b5.stl

fan-flange-b4.stl

bag-flutter-valve-deflector-free-b5.stl

fan-director-10-mm-b5.stl

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