Anesthesia Machine: Pressure Regulation
Last updated: 06/06/2017
Anesthesia machines have high, intermediate, and low pressure circuits. These are regulated by safety devices built within the machine to ensure optimal delivery to the patient.
- High-pressure circuitE-cylinders attached to back of machine, Oxygen 2200psi, Nitrous Oxide 745psi. Gas travels from cylinder to first pressure regulator in anesthesia machine. Pressure regulator reduces it to a more constant pressure, 45psi. Machine is also set to only use pipeline gas (set at 50psi) so as not to waste gas cylinder content.
- Intermediate pressure circuitAt approximately 45 psi. Receives gas from first pressure regulator or wall pipeline, extends to second-stage reducing device. Flush valve delivers gas to common gas outlet (and subsequently to the patient) directly from intermediate circuit.
- Low-pressure circuitAt second stage reducing device, gas is reduced to 26psi N2O and 14psi for O2. Extends from flow control valves to common gas outlet.
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.