The COVID-19 pandemic created temporary shortages of medical equipment like ventilators throughout the world. Recent medical research also indicates a gentle ventilation may be more appropriate for many patients. This article details the design of an open source gentle ventilator (gentle-vent) framework that can be used in periods of scarcity when no other options are available. The system utilizes a wide range of commonly available components that are combined using basic electronics skills to achieve the desired end product. The firmware is programed in the Arduino IDE using any Arduino compatible microcontroller. The main function of the gentle-vent is to generate a calibrated pressure wave at the pump to provide support to the patient’s breathing. Each gentle-vent permutation was tested using a DIY manometer as it could be done in the field in low-resource settings. These measurements were also verified with an open source VentMon. All permutations were able to accurately hold a desired setpoint for at least 2 hours. The most rudimentary implementation using found mechanical components and perf-board costs less than $20. The results indicate that an open source approach can be used to make breathing support accessible in most contexts.

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