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Changes to Bunny Science™ PAPR Introduction

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Bunny Science HALO Respirator design by Guy Kuo, MD Anesthesiologist. [ … ] This is not a mask, but a PAPR (Powered Air Purifying Respirator). It extends utility of already FDA approved anesthesia viral filters to create a highly protective PAPR. As a full head covering PAPR, it protects both aerosol, droplet, and splash threat from all directions. [ … ] 1. Bunny Science Halo PAPR isolates user via positive pressure instead requiring a perfect face to mask seal. [ … ] Masks 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 can never pass fit testing for leaks. PAPR's avoid this usage pitfall. [ … ] 2. Halo PAPR extends use of approved, viral filters. These are ubiquitous in the operating room setting and have safely provided higher than N95 filtering for many years. Design Highlights [ … ] * Provide clean breathing air via FDA approved, ventilator viral filter or medical air/oxygen * COMPLETELY protect entire head and face to airborne and splash risks * Uses positive pressure to maintain protection even without a perfect seal * Use disposables that are readily available * Able to create positive pressure seal even using FDM 3D parts. [ … ] Hood is a polyethylene bag placed over head and secured around neck. Breathable environment is at positive pressure. Expiration ports are unidirectional flow valves or additional output filters. [ … ] Fan Powered Filtered PAPR - Full PAPR by drawing room air through anesthesia viral filter via a fan. Fan is powered by 12 volt battery pack or AC adapter. [ … ] Developmental Testing [ … ] The Halo has been tested at my hospital against nebulized N95 test aerosols for proper isolation. To simulate worst case test conditions, test aerosol was directed at air intake, exhausts, and neck seal. Although, this is not identical to NaCl challenge, there is no logical reason to require re-testing of filters already accepted by FDA as having adequate viral filtering. [ … ] Physiologic monitoring for CO2 clearance, oxygen saturation, and respiratory rate was verified as sustainable using OR patient monitor and continuous gas sampling analysis. User ability to wear system for over four hours was confirmed. Wearer has ability to carry out typical operating room procedures, watch monitor, fill out EHR, walk and push gurneys. [ … ] Main Project Page https://bunnyscience.dozuki.com/Guide/HALO+Respirator+(Buildable+PAPR)/4 [ … ] Detailed clinical, assembly, use and function video are now at... assembly video https://youtu.be/JMXP8jAmDKA [ … ] MostActual wear during case https://youtu.be/Ke0FMhEeWhA Most Recent 3D parts files can be downloaded from... files... https://www.thingiverse.com/thing:4243272 or  https://www.prusaprinters.org/prints/27657-halo-buildable-papr-powered-air-purifying-respirat [ … ] 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. [ … ] Art Credit: Generic human head model by John Brown.
Bunny Science HALO Respirator design by Guy Kuo, MD Anesthesiologist. [ … ] This is not a mask, but a PAPR (Powered Air Purifying Respirator). It extends utility of already FDA approved anesthesia viral filters to create a highly protective PAPR. As a full head covering PAPR, it protects both aerosol, droplet, and splash threat from all directions. [ … ] 1. Bunny Science Halo PAPR isolates user via positive pressure instead requiring a perfect face to mask seal. [ … ] Masks 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 can never pass fit testing for leaks. PAPR's avoid this usage pitfall. [ … ] 2. Halo PAPR extends use of approved, viral filters. These are ubiquitous in the operating room setting and have safely provided higher than N95 filtering for many years. Design Highlights [ … ] * Provide clean breathing air via FDA approved, ventilator viral filter or medical air/oxygen * COMPLETELY protect entire head and face to airborne and splash risks * Uses positive pressure to maintain protection even without a perfect seal * Use disposables that are readily available * Able to create positive pressure seal even using FDM 3D parts. [ … ] Hood is a polyethylene bag placed over head and secured around neck. Breathable environment is at positive pressure. Expiration ports are unidirectional flow valves or additional output filters. [ … ] Fan Powered Filtered PAPR - Full PAPR by drawing room air through anesthesia viral filter via a fan. Fan is powered by 12 volt battery pack or AC adapter. [ … ] Developmental Testing [ … ] The Halo has been tested at my hospital against nebulized N95 test aerosols for proper isolation. To simulate worst case test conditions, test aerosol was directed at air intake, exhausts, and neck seal. Although, this is not identical to NaCl challenge, there is no logical reason to require re-testing of filters already accepted by FDA as having adequate viral filtering. [ … ] Physiologic monitoring for CO2 clearance, oxygen saturation, and respiratory rate was verified as sustainable using OR patient monitor and continuous gas sampling analysis. User ability to wear system for over four hours was confirmed. Wearer has ability to carry out typical operating room procedures, watch monitor, fill out EHR, walk and push gurneys. [ … ] Main Project Page https://bunnyscience.dozuki.com/Guide/HALO+Respirator+(Buildable+PAPR)/4 [ … ] Detailed clinical, assembly, use and function video are now at... assembly video https://youtu.be/JMXP8jAmDKA [ … ] MostActual wear during case https://youtu.be/Ke0FMhEeWhA Most Recent 3D parts files can be downloaded from... files... https://www.thingiverse.com/thing:4243272 or  https://www.prusaprinters.org/prints/27657-halo-buildable-papr-powered-air-purifying-respirat [ … ] 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. [ … ] Art Credit: Generic human head model by John Brown.