Mixed Pressure Control Innovation of Oxygen and Air Pressure in Ventilator with Safety Valve

Abstract

The medical gas in the ventilator is very influential in maintaining patient survival so that the gas must be sterile, have high purity and have a stable pressure, with a value of no more than 5 bars. To maintain the stability of this pressure, a control device for oxygen and air pressure on the ventilator is designed with a safety valve. Pressure control on this ventilator mixing tube uses an ATMega328P microcontroller to drive the Pneumatic Valve as a safety device. Furthermore, the pressure will be read by the MPX 5700 AP sensor. After that, the results of a pressure reading of 1 to 5 bars are displayed on the seven-segment display. The comparison of the pressure difference between the pressure read by the sensor and displayed on the manometer resulted in the highest error of 4% and the lowest error of 2.37%. Whereas in the relay contact test, the safety valve worked well, and the error value was 3.29%. The difference in error values is considered completely safe to use.