  The pandemic caused by Severe Acute Respiratory Syndrome Coronavirus 2
(SARS-CoV-2) has affected countries all across the world, heavily burdening the
medical infrastructure with the growing number of patients affected by the
coronavirus disease (COVID-19). With ventilators in limited supply, this public
health emergency highlights the need for safe, fast, reliable, and economical
alternatives to high-end commercial devices and has prompted the development of
easy-to-use and mass-producible ventilators. Here, we detail the design of the
HDvent Emergency Ventilator System. The device performs ventilation through
mechanical compression of manual resuscitators and includes control
electronics, flow and pressure sensors, and an external data visualization and
monitoring unit. We demonstrate its suitability for open loop, pressure- and
volume-controlled ventilation. The system has not undergone clinical testing
and has not been approved for use as a medical device. The project
documentation needed to reproduce the prototype is freely available and will
contribute to the development of open source ventilation systems.
