Gas Machine Flashcards
the 4 basic systems of the gas anesthesia machine
compressed gas supply, anes vaporizer, breathing circuit, scavenging system
color of O2 tanks
green
difference between E and H O2 tanks
E smaller, attach to yoke of machine
H larger, attack to wall or cart, hooked up via gas line
pressure of a full E or H tank when full
2200 psi
formula to calculate Liters in an E tank
psi x 0.3
formula to calculate liters in an H tank
psi x 3
color of N2O tank
blue
what the outlet valve and outlet port on a tank do
outlet valve- controls flow of gas out of cylinder
outlet port- port thro which gas flows out of tank
the gauge on an N2O tank measures
gas content (not liquid), measure amount left in tank by weight not gauge
what the pressure-reducing valve does
reduces pressure of gas coming out of tank to ab 40-50 psi
what the line pressue gauge measures
psi in gas line after passing pressure-reducer (should read 40-50 psi)
the tank pressure gauge measures
the pressure of gas exiting the tank (before reaching reducer)
this gauge gives an idea of amount of O2 in tank when tank is open
tank pressure gauge
a tank pressure gauge should read ___ when full and ___ when empty
full= 2200 psi empty= 0 psi
normal flow rate
1L/ min
a full tank lasts ab how long
11 hr
what the flow meter does
further reduces the psi to ab 15psi, valve controls flow rate in L/min, ball indicator
formula to calculate tidal volume
10ml/ kg
formula for determining O2 flow rate for a partial rebreathing system
25-50ml/ kg/ min
formula for determining O2 flow rate for a total rebreathing system
15ml/ kg/ min
what the flush valve does
delivers large volume of O2 to breathing circuit bypassing vaporizer and flow meter
why we would use the flush valve
deliver high volume of O2, fill reservoir bag, dilute out anes gas at end of procedure
how to deliver pure O2
turn off vaporizer, squeeze gas out of reservoir bag
if the flow meter is off..
we get no anes gas
red vaporizer is for
halothane
purple vaporizer is for
isoflurane
yellow vaporizer is for
sevoflurane
blue vaporizer is for
desflurane
anes liquid is a volitile liquid meaning that it
will evaporate fast into the air
where the O2 enters the vaporizer from flow meter
vaporizer inlet port
point where fresh gas (O2 +anes) leaves vaporizer thro hose (goes to breathing circuit)
vaporizer outlet port
the breathing circuit refers to
how gas is delivered to patient
the rebreathing circuit is also called
the circle system
a rebreathing circuit can be used for animals of what size
> 15 lbs
where is the flush valve located
on flow meter
where is the pressure relief/ pop-off valve located
on top of expiratory unidirectional valve
what part of machine determines whether system is open or closed
pop-off valve (pressure relief valve)
gauge that tells us pressure in system/ patients lungs
pressure manometer (on top of CO2 absorber)
where is negative pressure relief valve located
on inspiratory side of machine
