ventilator

thingiverse

Hi this is a design for a ventilator it's open source and it should be noted that this is an initial design without any medical certification. This device is designed to provide ventilation for one human only and it's powered by one stepper motor NEMA only. It has four solenoid valves and two balloons if the balloons are not available you can use a Pepsi bottle with 1.75L volume which will fit perfectly. The working principle is as follows when the two balloons are being compressed the solenoid valve at the oxygen tank is closed to prevent the oxygen from reentering the tank the solenoid valve at the other end of the red balloon is open forcing the oxygen into the patient's lungs. The solenoid valve at the inlet of the green balloon is closed providing a single path for the oxygen into the patient's lungs and the last solenoid valve which is at the outlet of the green balloon is open allowing used air to be pumped outside. When the two balloons are being decompressed the solenoid valve at the oxygen tank is open so that oxygen flows from the tank to the red balloon. The solenoid valve at the other end of the red balloon is closed preventing used air coming out from the patient's lungs from mixing with fresh oxygen. The solenoid valve at the inlet of the green balloon is open providing a negative pressure that sucks used air from the patient's lungs into the green balloon and the solenoid valve at the outlet of the green balloon is closed keeping outside air from entering. For any suggestions please contact me so I can develop a second edition. For better understanding of the working principle this link to a video on my Facebook page illustrates the working principle at the last 18 seconds https://www.facebook.com/106353767552944/videos/1139922196371940/