Bunny Science™ PAPR

thingiverse

Bunny Science™ PAPR Respirator design by Guy Kuo, MD Anesthesiologist. Bunny Science™ PAPR Respirator is a specific embodiment of a patent pending Personal Protection Equipment. It is licensed strictly for non-commercial build for frontline workers who don't have access to commercial PPE. This respirator extends usage of FDA approved anesthesia viral filters to create a hooded PAPR. As a full head covering PAPR, it defends against aerosol, droplet, and splash threat from all directions. • Bunny Science™ PAPR isolates user via positive pressure instead of requiring a perfect face to mask seal. Masks require a perfect facial seal to protect user. Even bear stubble defeats a mask seal. Some people simply cannot use an N95 mask because they cannot pass fit testing for leaks. PAPR's avoid this usage pitfall. * Bunny Science™ PAPR extends use of FDA approved viral filters. These are ubiquitous in the operating room setting and have provided higher than N99.99+ filtering for many years. I do not propose use of new, unknown, or unproven filtering materials. Design Highlights * Provide filtered air via FDA approved, ventilator viral filter * COMPLETELY protects entire head and face against airborne and splash risks * Uses positive pressure to maintain isolation even without a perfect seal * Uses disposables that are readily available * Dramatically lower flow requirements compared to traditional PAPRs * Field buildable * Able to create positive pressure seal even using FDM 3D parts. Hood is a plastic bag placed over head and secured around neck. Bunny PAPR provides airtight penetrations through the bag for inspiration and expiration. Breathable environment is at positive pressure. Expiration ports are unidirectional flow valves, but typically valve function is never engaged due to continual positive pressure. Fan draws room air through anesthesia viral filter. This frees wearer from work of pulling air through filter. Fan is powered by 12 volt battery pack or AC adapter. If configured with VB48Max filters (one inflow, one outflow), filtering in both inflow and outflow directions enables very comfortable wear WITHOUT a surgical mask. Developmental Testing The Bunny Science PAPR has been verified 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. Physiologic monitoring for CO2 clearance, oxygen saturation, and respiratory rate was verified as sustainable using patient care monitor and continuous gas sampling analysis. User ability to wear system for over 11 hours is confirmed. Wearer has ability to carry out typical operating room procedures, watch monitor, fill out EHR, walk and push gurneys. ****** Important If you download files for Bunny Science™ PAPR, do so as individual files to get most recent versions. Thingiverse's "Download All" button does not necessarily always download current files. https://www.bunnypapr.com Main project page with far or mored detailed instructions than here. ****** Preparation for Wear https://youtu.be/NXW0xUPl0_c BunnyPAPR video playlist... https://www.youtube.com/playlist?list=PL4D2lchZjkr4RzdM9kuF6EGZMYyIZ4cg2 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 of this PAPR respirator is at your sole discretion and risk.'' License: Project is a specific parts design for an embodiment of a patent pending PAPR. This specific parts design is published, for humanitarian reasons, under the Creative Commons Attribution-NonCommercial-NoDerivs CC BY-NC-ND with addition of the following conditions: - The duration of this license ends either 6 months after the emergency proclamation for COVID-19 issued March 13, 2020, by the White House is revoked or ends OR Jan 1, 2022, whichever is earlier. - All manufactured units fabricated during the duration of this license can continue to be used for non-commercial purposes beyond the time frame of this license for up to 10 years after the date of original manufacture. Bunny Science™ is a mark of Kuo Software, LLC Generic human head model by John Brown. --- Notes Print Settings 3 perimeters. 4 top. 4 bottom layers, 20% gyroid fill Temp set 5C higher than usual to achieve best inter-layer fusion. My temps with E3D and brass nozzle Nozzle 1st layer 255C / thereafter 260C Bed 1st layer 85C / thereafter 90C My temps with Slice Mosquito and Tungsten Carbide nozzle Nozzle 1st layer 255C / thereafter 265C Bed 1st layer 85C / thereafter 90C IMPORTANT SLICING SETTING For the 22 mm and VB48Max filter adapters that connect to a round filter, set slicer seam positions to RANDOM. Otherwise, your slicer may align seams and create a vertical seam that can act as a microchannel through the adapter/filter seal. Setting seams to random avoids creation of a continuous vertical seam. --------- Guy Kuo, MD