DIY Breath Controlled Ventilator Part 1
etischer etischer
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 Published On Mar 30, 2020

This is an experiment to see what's involved in building an Assist Control Ventilator as a DIY project. This will be an open source project, files will be posted on my website at http://www.etischer.com/ventilator

Note: I have no experience in the medical field, and am certainly not an expert in ventilators.


I'll be machining the mechanical parts on my Shapeoko CNC router, and designing the controls hardware & software myself. I have quite a bit of experience with the electrical and software portion of the project (Sr. Staff Controls Engineer Tesla (retired)) but no experience with medical devices, ventilators, or CPR equipment. I'm hoping people with experience in these areas can chime in with suggestions as the project progresses. Normally I would wait until I've completed a project before posting a video about it, but because timing could be critical in some situations, I thought it would be helpful to share my ideas as they come. I have a NEMA 34 stepper on order to replace the AC gear motor. I would love to hear from others attempting to build their own ventilators, please feel free to leave me some comments below.

List of resources I've used so far:
https://e-vent.mit.edu/mechanical/
   • Ventilator Modes Explained! PEEP, CPA...  


An assist control ventilator measures the pressure changes as the patient starts to inhale, and uses that as a trigger to start the breath cycle on the ventilator. This is slightly more complex than a ventilator that runs based on timers. The ventilator I'm building will have both modes available. I'll also have as many fault detections as possible (stalled motor, slipping coupling, trigger timeouts, high pressure limits, plateau pressure limits...)

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