”This is the design details and prototype test results for an open-sourced life support ventilator that could be manufactured quickly in high volume.
The electric flow generator is a Linear Diaphragm Compressor (LDC). Very efficient and highly reliable with few moving parts. No bushings, bearings or rotating components.
The LDC with electronic control package provides all flow generating functions needed for a durable, efficient, small, medical ventilator.”
https://open-source-covid-19-ventilator-canada.mn.co/