ventilator_second_edition

thingiverse

This is the design of the third version of the Ventilator. This design is free and open source. It has the ability to provide a user-defined volume of air, with the ability to monitor pressure, humidity, and temperature of the provided air. The design is based on the principle of the piston and cylinder, where the cylinder is fixed and the piston moves inside it. The minimum stroke distance between the piston and the base of the cylinder is 8mm, while the maximum stroke distance is 53mm, with a diameter of 150mm. This allows for choosing the volume to be pumped from 0 cc to 900 cc. There is an infrared sensor in front of the moving piston that continuously determines its position so it can determine how much air has been pumped into the lungs. The ventilator uses two NEMA stepper motors to provide the required torque on the crank to drive the piston through a connecting rod, and with two cooling fans used to cool them down. The cylinder contains two one-way valves: the first is for drawing fresh air when the piston head retracts, while the other valve pumps in fresh air. The piston head has two layers that reduce the possibility of tilting while pumping. Any suggestions for developing this design are most welcome.