CroResp
Pandemija

Solution Overview & Benefits
This is an Air Purifying Respirator (PAPR) mask.
CroResp comprises a respirator with eye protection made from a diving mask, adapter and virus filter. The respirator is designed for personal use at the discretion of medical professionals in the case of lack of certified and tested protective equipment.
The respirator is intended to protect the airways and eyes of medical personnel, especially those who carry out procedures where aerosol is generated by coronavirus infected patients.
History & Development
This project was inspired by the pioneering efforts of two groups from Italy and the United States.
The Italian company Isinnova, in collaboration with Dr. Renato Favero of Gardona Val Trompia Hospital in Italy, made a 3D printed replacement ventilator valve used to treat patients, and then a non-invasive ventilation mask based on the Decathlon diving mask. Non-invasive ventilation is currently widely used in Italian hospitals to support the breathing of patients who are in a serious (but not critical) condition and do not require immediate intubation and invasive ventilation.
At the same time, a group from the United States (Boston Children’s Hospital) has proposed an innovative way of making a device that, in the absence of PPE, can replace a respirator for the personal protection of medical personnel. They suggested and presented a way to make a respirator out of an anesthetic mask, a viral filter and elastic bands, parts that should still be widely available.
CroResp is a combination of the above methods - the Italian idea of a diving mask with a customized adaptor and the American virus filter connected to an adapter created by 3D printing.
Team Disclaimer:
- “The proposed equipment has not been tested and it does not have the certificates for use issued by competent bodies. This equipment must not be used if you already have an approved PPE. Use this equipment only when you do not have an adequate PPE. You use the equipment on your own responsibility.
- The authors of the equipment and people creating pandemija.info web page are not responsible for any guarantees, written or implied, including the quality, suitability and additional uses, and they will not be responsible for any losses or damages that arise from using this equipment.
- YOU USE THIS ON YOUR OWN RESPONSIBILITY!”
- THIS DEVICE IS NOT APPROVED FOR CLINICAL USE YET.
Availability
- Publicly available: Yes
- Price range: 1 to 20 USD
- Offered or can be licensed for local manufacture: Yes
Specifications
Materials needed:
- Full face diving mask from Decathlon
- Virus Filter Adapter – made by 3D printing process
- Medical filter for viruses, with the highest filtration rate available
- Flat screwdriver
Because different manufactures and models of masks exist, with different connectors to which the adapter is connected, we created two different models. One for the Decathlon mask, based on which the original Italian project was made, and the other a new connector for the ExtremeSub mask. A similar adapter can be made for any other similar full face diving mask, but it is also advisable to choose one that is widely available and affordable in your location.
This is the first final version of the print file, completed after a dozen of improvements and testing of the printed adapters. Further modifications may be made after testing for practical application by the medical personnel and further testing.
Recommended print settings:
- Layer: 0.2 mm
- Infill: 20%
- Filament: PLA or PETG
- Position: vertical, wider part at the bottom
- Brim: on
Assembly procedure:
- Remove the vent valve protection at the front side of the mask. This valve otherwise serves to drain small quantity of water that can accumulate inside the mask during a diving
- Remove the membrane, flip it, and place it back in the same place in the mask – STILL TESTING/DEBATING THE POSITION OF VALVE
- Return the vent valve protection to its initial position
- Remove the valves that separate two chambers from the inside of the mask, located adjacent to the nose section
- Attach the 3D printed adapter for the virus filters to the snorkel connector at the top of the mask.
- Attach the virus filter to the 3D printed adapter.
Additional Information
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