Anesthesia Gas Machine Exam 1 Flashcards
Ideal Gas Machine
safe
efficient
economical
accurate
AANA Standards for CRNA practice includes (4)
- patient centered high quality consistent anesthesia care
- assist public to better understand role as CRNA’s
- foundation for CRNA practice
- modification of standards (always document modification and why)
which standard mentions equipment
standard 6
American Society for Testing and Materials (ASTM F1850-00)
- standard specifications for particular requirements for anesthesia workstations and their components
- published 2000, updated 2005
- workstations must have monitors that include: battery backup, high/medium/low priority alarms, required monitors, hanger yokes, PISS, electrical supply cord, flowmeters vaporizers
1L Liquid O2 = _____ gas O2
860L
pipeline supply, how much supply should be on hand at one given time
primary, secondary, minimum of one day reserve supply needed
standard flow rate for O2 and N2O through those systems
100L/min or greater (before regulator)
critical temperature
temperature below which a gas is going to be converted to liquid form by pressure
critical temperature of oxygen
-118c
what does drop in temperature do to molecules of a gas
slows movement (less KE)
pipeline tanks are:
temperature controlled, insulated, and pressurized
critical temperature of N2O
36.5c
pipeline supply specs (4)
- wall mounted
- connected to supply hoses
- filter and check valves
- check gauges
KISS
connects gas hose to wall outlet. unique key connected for each gas
DISS
diameter index safety system. each fitting is threaded and has different diameter and internal key unique for each gas. has valve that will shut off gas supply if its disconnected
where are floating valves found
where pipeline and AGM meet
inspiratory and expiratory limb of y piece tubing
in vaporizers
ball and spring valve example
O2 flush valve
diaphragm valve or regulator
reduces pressure in 1st and 2nd stage regulators, helps maintain constant steady flow
supply safety systems (4) for pipelines and cylinders
- color coding
- PISS (e cylinder)
- KISS (pipeline)
- DISS (pipeline)
state of O2, N2O and medical air at room temp
O2 exists as gas
N2O exists as gas with liquid overlying
medical air exists as a mixture
bourdon pressure gauge
aneroid or without liquid
measures high pressure relative to atmospheric prerssure
expansion or contraction of coiled tube
thin walled tube straightens when exposed to pressure
rises above atmospheric pressure causes tube to slightly uncoil and numeric number on gauge increases
safety relief devices for E cylinder
- woods metal
- spring loaded valve
- frangible copper disc
woods metal composition
resembles large diameter flathead screw. BLTC. bismuth, lead, tin, cadmium
frangible copper disc
will burst when service proceeds pressure by factor of 2
cylinder construction
in accordance with DOT
has to be registered with bureau of explosives
medical and anesthetic gases have specification number
Cylinder Regulation: DOT
cylinder design construction testing marking handling filling transportation
Federal FDS
regulated medical gases contained in cylinders
US Pharmacopoeia
sets standards for potency and purity
CGA: Compressed Gas Association
sets standards for safe practice
National Fire Protection Association
location, construction, installation of bulk systems
adiabatic compression ignition
high pressure wave recompresses raising gas temp
regulator is composed of
tension springs and diaphragm
thorpe tube principle
constant pressure, variable orifice
flow through the flowmeter depends on
pressure drop across constriction
size of annular opening
physical properties of gas
latent heat of vaporization with volatile agents
temperature of remaining liquid will drop as vaporization proceeds, lowering VP
decreases amount vaporized and saturated VP unless heat is stabilized
Vaporizer Components
variable bypass flow over (liquid volatile agent) temperature compensated (to compensate for ambient pressures) agent specific calibration out of circuit
Tec 6 Indicators
warm up (amber, can't turn control dial) operational (green) no output (red, vaporizer can't add agent vapor to gas flow due to lack of agent, tilting, or malfunction) low agent (<250ml in agent sump) low battery (amber, only powers audible and visible alarms)
what is O2 responsible for
proceeds through flow meter O2 flush valve activates fail safe activates low pressure alarm drives ventilator
