Please see a more recent version of my design in this video:    • OpenVent Bristol V2.0 COVID-19 rapid ...  
and the published design here: https://www.instructables.com/id/Open...

https://openventbristol.co.uk/


The USP of this design is how easy and fast it can scale for mass production for the following reasons:
- Automated production: The production of each part is fully automated (laser cutting), with only 8 different parts
- Only 6 off-the-shelf components: Very few different components are needed and no exotic parts are needed (not even a motor coupling)
- Simple mechanism: It uses a super simple mechanism with just an arm mounted to a motor - no complicated mechanisms to go wrong, just one moving part
- Fast assembly: Complete assembly is possible in around 20 min with one person
- Adjustable settings: Has full adjustment of breath frequency and pressure/tidal volume and with a small adaption can function within all NHS requirements
- Low cost

The design is open source and a build guide is available on Instructables: https://www.instructables.com/id/COVI...

This design doesn't currently meet the NHS requirements (in link below). A list of improvements for the next version with the aim of meeting the spec is kept in the GitHub readme (link below), some of those things are here:

- A 12V battery backup with at least 20 min run time
- A battery management circuit to automatically switch over to the battery in a power cut (not actually required but would seem sensible)
- A pressure sensor alarm for sensing failure and a buzzer & LED to create an alarm on failure
- An LCD screen to show pressure and other values and Settings

GitHub code link: https://github.com/RealFreshRate/Open...

NHS Rapidly manufactured ventilator system specification: https://www.gov.uk/government/publica...

Leave a comment if you think there is anything else this will need before it could be safely adopted, particularly if you have experience using existing ventilators.

Disclaimer:
All users of this design and device shall be deemed notified of the warnings stated herein. This device is a simply designed, fast produced ventilator. This device should not be used in place of an existing hospital ventilator. These should only be used as a last resort where a patient has no other alternative due to the lack of availability of existing ventilators. This is not a fully medically certified device and should not be relied upon as such. The device is designed for use by trained medical professionals and should only be used by trained medical professionals; it is not intended for home use. The designers and manufacturers of this device shall not be held liable for any death or injury that may result from this device.

The designers and manufacturers of this device give no guarantees or warranties as to the efficacy and/or safety of this device.

This design isn't connected with dyson or any other ventilator projects including Dyson CoVent.