OpenVent - 3D printable BVM Ventilator, Design A2, our favorite

thingiverse

During the COVID-19 pandemic, a critical shortage of medical equipment became glaringly apparent, underscoring the severe impact that a lack of essential gear can have. Moreover, it's often simple equipment and designs that can be incredibly helpful when professional-grade tools are not readily available. This repository contains general information about an open-source ventilator device. The primary objective of this project is to create a ventilator using easy-to-assemble components that are widely available, with a clear focus on simplicity, scalability, and accessibility. This initiative began as part of the #WirvsVirus Hackathon organized by the German government and has since been actively developed, incorporating expert feedback from medical professionals. The project has also been selected for the give-a-breath-challenge and The Global Hack. Please review the full disclaimer before proceeding: The material and documentation provided here are offered without any explicit or implicit warranties. No information on this site is intended to serve as medical advice. All designs are intended for investigational use only, and this site does not represent any official policies or procedures. This project is provided "as is," with no warranty of any kind, express or implied, including but not limited to the warranties of merchantability, fitness for a particular purpose, and noninfringement. In no event shall the authors or copyright holders be liable for any claim, damages, or other liability arising from, out of, or in connection with the software or its use. Only use this repository, designs, documentation, or provided information if you accept the above disclaimer. Additional discussion, documentation, source code, electronics, and sensor design can be found on GitHub (https://github.com/mhollfelder/openvent), YouTube (https://www.youtube.com/channel/UCw9h6QsYEKY2sfZIYBNuHvw), and DevPost (https://devpost.com/software/openvent-open-source-3d-printable-ventilator). This design represents a further extension or variant based on our evolved A1 design, with additional extensions and upgrades to be posted here as well. Please review those too. General Concept: An AMBU-bag is used as a pressure reservoir, featuring an O2 inlet (O2 concentration is crucial for patients with acute respiratory syndrome) and several safety features, including overpressure and bypass valves. Being standard for emergency help, these bags are available in substantial volumes. A motorized and microcontroller+sensor controlled setup squeezes the bag at the right pattern, supporting assist-, pressure-, volume- and flow-control ventilation and exhaled gas measurements and filters. Our Implementation is based on hardware compatible with Arduino, an Infineon XMC4700 Relax Kit, and a Stepper Motor Control Shield with IFX9201 and XMC1300 on it. Among other sensors, two pressure sensors DPS368 are used for differential pressure detection. The user interface includes a commonly available I2C LCD Display Module 128 x 64 Pixel for Arduino. All components are based on open-source and commonly accessible parts; especially for the mechanics, the objective is to be scaleable in production and hence fully 3D-printable. Only the motor and its screws as well as the belt are not printed. Standard stepper motors such as Nema-23 are proposed. Electronics, sensors, and software are covered in our GitHub pages. Improvements: Based on the positive experience and confirmation of robustness with the already developed A0 design, this new design aims to eliminate potential sources of error while keeping print time/volume within bounds. The actual design can easily be scaled vertically to experiment with different sizes.