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Changes to Bunny Science™ PAPR Introduction

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Introduction
Bunny Science HALO Respirator design by Guy Kuo, MD Anesthesiologist. [ … ] This is not a mask nor face shield, but a full protective PAPR (Powered Air Purifying Respirator). It solves issues that plague not only DIY masks but also commercial N95 masks. [ … ] 1. Perfect face fit requirement: A mask which does not form a perfect facial seal is of no use for protection against aerosolized threat. Some simply cannot use an N95 mask because they cannot pass N95 fit testing against leaks. [ … ] Bunny Science Halo PAPR isolates user via positive pressure instead hoping for a perfect seal. [ … ] 2. Filter material must be effective against viral threat and be safe to breath through. The filter material must also be mounted without any leaks around the material. [ … ] Halo PAPR uses commonly available (in hospitals) anesthesia circuit viral filters. These filters are FDA approved and provide better than N95 filtering. [ … ] 3D parts files can be downloaded from... https://www.thingiverse.com/thing:4243272 or https://www.prusaprinters.org/prints/27657-halo-buildable-papr-powered-air-purifying-respirat [ … ] Video Intro Peek https://www.youtube.com/watch?v=MvbcmaCIgKk [ ] Full Intro and Instructional Video https://youtu.be/JMXP8jAmDKA [ … ] Design Highlights [ … ] * Provide clean breathing air via FDA approved, ventilator viral filter or medical air/oxygen * Completely cover head and face to protect against airborne COVID risks * Use positive pressure to maintain protection even without a perfect seal * Use disposables that are readily available * Field buildable [ … ] Barrier is a polyethylene bag placed over head and secured around neck. PAPR Halo provides airtight penetrations through the bag for inspiration and expiration. Breathable environment is at positive pressure. Expiration ports are unidirectional flow, but typically valve function is never engaged due to continual positive pressure. [ … ] Multiple Configurations are possible with the BS Halo. [ … ] Oxygen Fed - Halo PAPR is supplied 10L oxygen (or compressed, breathable air) via O2 tubing. KEEP FLOW at 10 L for best vapor clearance. Only one flutter valve is needed. [ … ] Fan - Portable operation is possible with the Halo PAPR by drawing room air through anesthesia viral filter via a fan. Fan is powered by 12 volt battery pack or AC adapter. [ … ] Testing [ … ] PAPR has been leak tested against micro-aerosolized threat using same aerosols as N95 mask fit testing. To simulate worst case test conditions, test aerosol was directed at air intake, exhausts, and neck seal. EtCO2 and pulse saturation monitoring of user over several hours were also performed. [ … ] The Bunny Science Halo PAPR is not yet a regulatory approved device. Use of this Halo respirator is at your sole discretion and risk.'' [ … ] Project is released under Creative Commons Attribution-NonCommercial-NoDerivs CC BY-NC-ND. [ … ] Bunny Science is the explorations arm of Kuo Software, LLC Art Credit: Generic human head model by John Brown.
Bunny Science HALO Respirator design by Guy Kuo, MD Anesthesiologist. [ … ] This is not a mask nor face shield, but a full protective PAPR (Powered Air Purifying Respirator). It solves issues that plague not only DIY masks but also commercial N95 masks. [ … ] 1. Perfect face fit requirement: A mask which does not form a perfect facial seal is of no use for protection against aerosolized threat. Some simply cannot use an N95 mask because they cannot pass N95 fit testing against leaks. [ … ] Bunny Science Halo PAPR isolates user via positive pressure instead hoping for a perfect seal. [ … ] 2. Filter material must be effective against viral threat and be safe to breath through. The filter material must also be mounted without any leaks around the material. [ … ] Halo PAPR uses commonly available (in hospitals) anesthesia circuit viral filters. These filters are FDA approved and provide better than N95 filtering. [ … ] 3D parts files can be downloaded from... https://www.thingiverse.com/thing:4243272 or https://www.prusaprinters.org/prints/27657-halo-buildable-papr-powered-air-purifying-respirat [ … ] Video Intro Peek https://www.youtube.com/watch?v=MvbcmaCIgKk [ ] Full Intro and Instructional Video https://youtu.be/JMXP8jAmDKA [ … ] Design Highlights [ … ] * Provide clean breathing air via FDA approved, ventilator viral filter or medical air/oxygen * Completely cover head and face to protect against airborne COVID risks * Use positive pressure to maintain protection even without a perfect seal * Use disposables that are readily available * Field buildable [ … ] Barrier is a polyethylene bag placed over head and secured around neck. PAPR Halo provides airtight penetrations through the bag for inspiration and expiration. Breathable environment is at positive pressure. Expiration ports are unidirectional flow, but typically valve function is never engaged due to continual positive pressure. [ … ] Multiple Configurations are possible with the BS Halo. [ … ] Oxygen Fed - Halo PAPR is supplied 10L oxygen (or compressed, breathable air) via O2 tubing. KEEP FLOW at 10 L for best vapor clearance. Only one flutter valve is needed. [ … ] Fan - Portable operation is possible with the Halo PAPR by drawing room air through anesthesia viral filter via a fan. Fan is powered by 12 volt battery pack or AC adapter. [ … ] Testing [ … ] PAPR has been leak tested against micro-aerosolized threat using same aerosols as N95 mask fit testing. To simulate worst case test conditions, test aerosol was directed at air intake, exhausts, and neck seal. EtCO2 and pulse saturation monitoring of user over several hours were also performed. [ … ] The Bunny Science Halo PAPR is not yet a regulatory approved device. Use of this Halo respirator is at your sole discretion and risk.'' [ … ] Project is released under Creative Commons Attribution-NonCommercial-NoDerivs CC BY-NC-ND. [ … ] Bunny Science is the explorations arm of Kuo Software, LLC Art Credit: Generic human head model by John Brown.