Mechanical BVM Ventilator V2

grabcad

Taking inspiration from the groundbreaking work done by MIT students in 2010 and the current crisis, we have developed Version 1 of a mechanically operated Bag-Valve-Mask based ventilator that can be rapidly developed, manufactured, and shipped using simple processes and off-the-shelf components where possible. The intention is to make it as efficient as possible, accounting for laser cutting of acrylic panels with tolerances set at .2 - .3mm in the overall diameters. A file will soon be uploaded to suit the files being cut on a flatbed router/ 3D Printed. The initial prototype has been produced with V2 already underway and medical trials expected to start shortly in conjunction with local universities and medical staff. The programming will be linked once it's finished and uploaded by the programmer. We have borrowed a lot of CAD for the 'off the shelf' components, providing links to those component creators when time allows. If you require any specific information, feel free to comment or pm us and we'll answer as soon as possible. Update 20/04/2020: V2 is now 98% finalized, but unfortunately, life has caught up with us and exams are next week, so this project has to be put on hold until they're finished. We have uploaded the assembly STEP which gives access to the model, but it means extracting each piece separately. The primary belt tensioner remains a work in progress, as does the additional dial required according to the programmer, which will be added before final V2 model files are released. A few more angle brackets may be needed to support central uprights at the base, and electronic component mounting points and BOM still need to be finalized. The idler pulley cover is the only part that needs 3D Printed, and we'll replace it with something generic when time allows. Update: 13/04/2020: Our first functional prototype has been completed. Please see the attached video. Note: In this current iteration, the 6mm front cross support will buckle under load and cause uneven loading on the main belts and gears. We are actively working on a solution to this issue but you can solve it by bolting a section of right angle between the cross section and side panel. This iteration is difficult to tension the belts correctly, and we're working on incorporating a tension adjustment mechanism. There's also a need for the idler pulley to be sprung as to provide light tension on the belt under load, which we are currently addressing.