DIY Automatic ventilation for AMBU bags 3d printable / made with laser cut acrylic

grabcad

My free contribution as a Maker to the DIY revolution of finding alternatives for the most needed medical supplies. I want to emphasize that this design is not final and that sizes of the bag are approximate, so before 3D printing the parts, they must be adjusted accordingly. This design compresses bags like Ambu Bags with ease, utilizing easily found components such as Nema 17 stepper motors, shaft couplers, and linear rods. The use of high helix screws ensures that with one stepper turn, the vertical movement is 25.4mm, allowing for cycles of 2s + 4s to be achieved. The body parts can be 3D printed, and a significant benefit of this design is that mechanical stress on the 3D printed parts is reduced as much as possible. An Arduino-based PCB controls the stepper movement, amplitude, and frequency of the movement, while also checking endstops sensors to ensure everything is moving as expected, and a buzzer notifies if something is not. Feel free to modify as you see fit. V2: For those interested, this new version can be made with laser-cut acrylic parts mostly, requiring only a few 3D printed parts; acrylic parts can be glued together or joined with 3D printed brackets and screws (not shown). The assembly has been simplified, and an endstop has been added to check that the movement is performed correctly. Please note that the assembly is still a work in progress.