Anesthesia Machine and Components Flashcards
1
Q
gas cylinders
A
-
color coded
- green = O2
- specific connection
- sizes (E tank = O2)
-
pressure and volume
- proportional
2
Q
gas cylinder sizes
A
-
E
- oxygen: 600 L, 1900 Psig (2000)
- nitrous: 1590 L, 750 Psig
-
M
- oxygen: 3500 L, 2200 Psig
- nitrous: 7570 L, 750 Psig
-
H
- oxygen: 7000 L, 2200 Psig
- nitrous: 15800 L, 750 Psig
3
Q
safety systems
A
-
no interchangeable conncections
- to prevent using the wrong type of tank (O2 vs N2O)
- Pin Index Safety System (PISS)
- Diameter Index Safey System (DISS)
4
Q
how to estimate how much is left in the tank with nitrous oxide?
A
use weight of tank!
can’t use pressure because it is liquid
5
Q
regulator
A
- usually two
- one that says the current psi of the oxygen (or respective) tank
- 2000psi = full
- one that can be adjusted to the pressure that will be delivered to the system
- 50-75 psi
6
Q
flowmeter
A
- measures gas flow (L/min)
- tapered glass
- color coded
- different knob sizes
- 1/3 max ratio O/N
- different floats
- ball (measure from center)
- skirted (measure from top)
7
Q
flush valve
A
- oxygen at intermediate pressure (45-50 psig)
- bypasses the flowmeter and vaporizer
- 35-70 L/min
- dilutes anesthetic gas
8
Q
classification of vaporizers
A
-
calibrated
- agent specific
- temperature compensated
- bypass chamber, injection
- electronically controlled
-
location
- VIC (unpredictable)
- VOC
9
Q
pressure gauge
A
-
measure pressure using controlled or assisted ventilation (10-20 cmH2O)
- positive pressure ventilation
- assisted: still breathing but not well
- controlled: not breathing on its own
10
Q
pop off valve
A
- usually left open
- closed intermittently to deliver breaths
- can be closed in the closed circuit system
11
Q
canister
A
- houses CO2 absorbent
- sodalime, baralyme
- should be more than 2x the Vt (Vt = 10-20 mL/kg)
- source of leaks
- should not be overfilled -> channelling
- will only go through middle of absorbent
- outside looks fine-can’t tell that the middle has been exhausted
12
Q
absorbent
A
- sodalime and baralyme
- reacts with CO2 forming heat and H2O
-
changes color with reaction (purple)
- not a permanent color chagne
- change when 1/2 of soda is purple
- pellets become harder after reaction
- start out moist
13
Q
scavenger
A
-
passive (most common)
- pressure > barometric
- cheaper, simpler
-
active
- flow inducing device
- expensive
-
charcoal absorber
- short life
- does not absorb N2O