Finally finished prototyping and testing..... It works!
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...
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Summary from site...
Due to the worsening global shortage of PPE (personal protection equipment), providers are being left with inadequate protection. Masks, best dealt with as single use items, are being reused. There simply is not enough supply of higher grade protection supplies to meet the need.
I am an MD Anesthesiologist and maker. I have combined 30 years of medical knowledge, design skill, and professional familiarity with airway equipment to create this Bunny Science PAPR Halo. It is NOT an approved medical device. Its use is solely at your risk.
This easily built PAPR is released as an emergent aid for the benefit of my fellow providers. This device is not perfect, but probably better than unavailable or worn out PPE. Again, this is only for when normal, approved PPE is unavailable or needs to be used in more critical areas.
BASIC Design Goals:
- Field buildable
- Use disposables that are readily available
- Flexible use of breathable air/oxygen sources
- Known, effective viral filter when using room air.
- Completely cover head and face
- Protect against airborne COVID risks
- Protect against liquid and splash from all directions
- Minimize 3D print requirement compared to helmet
Bunny Science PAPR Halo - Overview
Barrier is common a plastic bag placed over head and secured around neck. PAPR Halo provides airtight penetrations through the bag for inspiration and expiration. Breathable environment inside the bag is kept 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 PAPR Halo.
Oxygen Fed - PAPR Halo 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 PAPR Halo by drawing room air through anesthesia viral filter via a fan. Fan is powered by 12 volt battery pack or AC adapter.
External Air - PAPR Halo has optional connector block for 22 mm tubing. One serves as air source while the other as expiration port. For instance, a Bair Hugger can supply air and feed it through a viral filter to the PAPR halo.
NOTE: A surgical mask should also be worn (unless using external air block with distal filtered outflow)
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