Anesthesia Machine and Components Flashcards

1
Q

gas cylinders

A
  • color coded
    • green = O2
  • specific connection
  • sizes (E tank = O2)
  • pressure and volume
    • proportional
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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
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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)
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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

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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
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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)
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7
Q

flush valve

A
  • oxygen at intermediate pressure (45-50 psig)
  • bypasses the flowmeter and vaporizer
  • 35-70 L/min
  • dilutes anesthetic gas
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8
Q

classification of vaporizers

A
  • calibrated
    • agent specific
    • temperature compensated
    • bypass chamber, injection
    • electronically controlled
  • location
    • VIC (unpredictable)
    • VOC
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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
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10
Q

pop off valve

A
  • usually left open
  • closed intermittently to deliver breaths
  • can be closed in the closed circuit system
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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
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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
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13
Q

scavenger

A
  • passive (most common)
    • pressure > barometric
    • cheaper, simpler
  • active
    • flow inducing device
    • expensive
  • charcoal absorber
    • short life
    • does not absorb N2O
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