anesthesia machine Flashcards
Standards of the anesthesia machine are overseen by
American National Standards Institute (ANSI)
- PRIOR TO 2000
American Society for testing and materials (ASTM)
- After 2000
Alt. Associations having something to do with anesthesia machine standards (4)
Internacional Electrochemical Commission (IEC)
Compressed Gas Association (CGA)
Institute of Electrical and Electronic Engineers (IEEE)
Federal Drug Administration (FDA)
Contemporary Components of an anesthesia machine (9 large ones)
electrical supply battery back up alarms required monitors oxygen supply flowmeter oxygen flush valve vaporizers waste gas system
Battery back up must last
at least 30 minutes
Required monitors (6)
Inspired oxygen /co2 expired oxygen/co2 oxygen supply failure hypoxic guard system anesthetic vapor concentration Vital signs oxygen analyzer alarm
Oxygen supply includes
pipeline supply
cylinder
Components of High pressure system (4)
auxiliary E cylinder
Yoke assembly
bordoun gauge
high pressure regulator
High pressure component of the system is exposed to
up to 2000 PSI
Cylinders for MRI are made of
non-ferrous metal; i.e. ALUMINUM
US department of transportation issue regulations (7)
regulate: manufacture marking/labeling filling handling transport storage disposal of cylinders
Associations that have standards for cylinders (3)
compressed gas association
national fire protection association
United States pharmacopecia/national formulary USP/NF
carbon dioxide cylinder color
US/ ISO = grey
Medical air cylinder color
US = yellow ISO = black& white
Nitrogen cylinder color
US/ISO = black
nitrous oxide cylinder color =
US/ISO = blue
oxygen cylinder color =
US = green ISO = white
Vacuum (Suction) color =
US = white ISO = yellow
WAGD/Evac color =
US/ISO = purple
ANSI/ASTM vs FDA
ANSI/ASTM -> regulate what each thing on the machine does.
FDA regulates machine check
most common auxiliary cylinder size
E
United States pharmacopeia/national formulary sets
purity of medical gases
Pressure in cylinders for oxygen/nitrous oxide/air
2000 psig for oxygen/air
750 psig for nitrous oxide
Yoke Assembly (5)
- orient
- gas
- uni
- contains
- some
Orient tanks
Gas tight seal
Unidirectional flow of gases
Contains a filter
Some have check valve
—-> check valve ; Stops leaking into atmosphere
—–>check valve ; Stops transfer between tanks
Yoke Assembly check valve is responsible for : (3)
1 minimizes the transfer of gas from a cylinder at high pressure to one with lower pressure
(2) allows an empty cylinder to be exchanged for a full one while gas flow continues from the other cylinder into the machine
(3) minimizes leakage from an open cylinder to the atmosphere if one cylinder is absent.