ventilator second edition

grabcad

This is the design of the second 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 of monitoring the 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 is moving inside it. The minimum stroke is 8mm and the maximum stroke is 53mm, the diameter of the cylinder is 150mm. This will give the ability to choose the volume to be pumped ranging from 0 cc to 900 cc. There is an Infrared sensor in front of the moving piston, with the purpose of determining the position of the piston continuously, so as to determine the amount of air that has been pumped into the lungs. This ventilator has two stepper motors, to provide the required torque on the crank to drive the piston through the connecting rod. With two cooling fans used to cool down the stepper motors. The cylinder has two one-way valves, the first one is to ensure that when the piston head retracts, the cylinder will draw fresh air. And the other valve is used to pump the fresh air inside the lungs. The piston head has two layers, used to reduce the possibility of tilting while pumping. Any suggestions to develop this design are most welcome.