Ventilador mecânico invasivo de emergência resistente e de fácil manutenção

Translated title of the contribution: Robust, maintainable, emergency invasive mechanical ventilator

Paulo J. R. Fonte, Alberto Martinho, Américo Pereira, Andreia Gomes, Ângela Neves, Antero Abrunhosa, António Bugalho, António Gabriel-Santos, António Grilo, Carlos Carmo, Elsa Maltez, João Agostinho do Nascimento, João Goes, João Martins, João Pedro Oliveira, Jorge Pimenta, José Paulo Santos, Luís C. Gil, Luís Lopes, Mário PimentaOlga Moreira, Orlando Cunha, Pedro Pinheiro de Sousa, Pedro Póvoa, Sandra Cavaco-Gonçalves, Susana Barroso, Telmo G. Santos

Research output: Contribution to journalArticlepeer-review


OBJECTIVE: To develop a simple, robust, safe and efficient invasive mechanical ventilator that can be used in remote areas of the world or war zones where the practical utility of more sophisticated equipment is limited by considerations of maintainability, availability of parts, transportation and/or cost. METHODS: The device implements the pressure-controlled continuous mandatory ventilation mode, complemented by a simple assist-control mode. Continuous positive airway pressure is also possible. The consumption of compressed gases is minimized by avoiding a continuous flow of oxygen or air. Respiratory rates and inspiration/expiration time ratios are electronically determined, and an apnea/power loss alarm is provided. RESULTS: The pressure profiles were measured for a range of conditions and found to be adjustable within a ± 2.5cmH2O error margin and stable well within this range over a 41-hour period. Respiratory cycle timing parameters were precise within a few percentage points over the same period. The device was tested for durability for an equivalent period of four months. Chemical and biological tests failed to identify any contamination of the gas by volatile organic compounds or microorganisms. A ventilation test on a large animal, in comparison with a well established ventilator, showed that the animal could be adequately ventilated over a period of 60 minutes, without any noticeable negative aftereffects during the subsequent 24-hour period. CONCLUSION: This ventilator design may be viable, after further animal tests and formal approval by the competent authorities, for clinical application in the abovementioned atypical circumstances.

Translated title of the contributionRobust, maintainable, emergency invasive mechanical ventilator
Original languagePortuguese
Pages (from-to)351-359
Number of pages9
JournalRevista Brasileira de Terapia Intensiva
Issue number3
Publication statusPublished - 2022


  • Animals
  • Continuous Positive Airway Pressure
  • Humans
  • Respiration
  • Artificial
  • Ventilators
  • Mechanical


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