Pereira, AméricoLopes, LuísFonte, PauloPóvoa, PedroSantos, Telmo G.Martinho, Alberto José Antunes MarquesNeves, ÂngelaBugalho, António A.Gabriel-Santos, AntónioPimenta, Gonçalo Gaspar BentesGoes, João Carlos da PalmaMartins, João F.Oliveira, João Pedro Abreu deSantos, José PauloGil, Luís Miguel Chagas da CostaDomingues, Miguel OnofreCunha, Orlandode Sousa, Pedro PinheiroRodrigues, Tiago A.Duarte, Valdemar RebeloAbrunhosa, AnteroGrilo, Antóniodo Nascimento, João AgostinhoPimenta, Mário2022-06-142022-06-142020PURE: 44740935PURE UUID: 95da50cd-c0af-4362-b31e-98f9c43d193fORCID: /0000-0002-6045-9994/work/114457829ORCID: /0000-0002-5890-0971/work/114457958ORCID: /0000-0003-3396-4634/work/114458222ORCID: /0000-0002-1797-2020/work/114458292ORCID: /0000-0002-1137-9373/work/151424189http://hdl.handle.net/10362/139995We present a viable prototype of a simple mechanical ventilator intended as a last resort to ventilate COVID-19 patients. The prototype implements the pressure-controlled continuous mandatory ventilation mode (PC-CMV) with settable breathing rates, inspiration/expiration time ratios and FiO2 modulation. Although safe, the design aims to minimize the use of technical components and those used are common in industry, so its construction may be possible in times of logistical shortage or disruption or in areas with reduced access to technical materials and at a moderate cost, affordable to lower income countries. Most of the device can be manufactured by modest technical means and construction plans are provided.3201619engother10.48550/arXiv.2004.00310