Anesthesia Machine

Question 1

5 pathways of O2

Answer 1

1 - flow to fresh gas flowmeters
2 - powers O2 flush valve 
3 - activates fail-safe mechanisms
4 - activates O2 low-pressure alarm
5 - compresses the bellows on the vent

Question 2

fail-safe O2 alarm

Answer 2

tells us O2 supply reduced

less than set value

Question 3

O2 low pressure alarm

Answer 3

Safety valve, located downstream from the N2O supply.
tells us pressure is reduced, can’t detect low O2, just pressure (doesn’t prevent hypoxic mixture)
shuts off N2O or proportionally decreases the supply, if O2 pressure decreases to predetermined threshold (25psi)

only O2 delivered

Question 4

High pressure system

Answer 4

1 - cylinder/tanks
2 - pressure gauges
3 - pressure regulator

O2 cylinder = 2200psi
N2O = 4500psi

must be 45psi to enter mating

Question 5

Intermediate pressure system

Answer 5

1 - pneumatic part of master
2 - pipeline sources (O2, N2O, air- DISS)
3 - Pressure regulators (second stage)
4 - oxygen pressure failure device
5 - oxygen flush valve (35-75L for check)
6 - flowmeter control valves (but not actual flowmeter)

Question 6

Low pressure system

Answer 6

1 - flow meter tubes
2 - hypoxia prevention safety device (if try to deliver O2t give N2O)
3 - unidirectional valves (outlet check valve)
4 - pressure relief devices
5 - common gas outlet
6 - vaporizers/vaporizer manifold
7 - pressure is slightly above atm pressure

Question 7

DISS

Answer 7

Diameter index safety system
provides non interchangeable connections for medical gas lines
connection consists of body, nipple, nut combo
only properly mater parts will fit together and allow the threads to engage
require for every anesthesia machine

Question 8

PISS N2O

Answer 8

blue

3 & 5

Question 9

PISS air

Answer 9

yellow

1 & 5

Question 10

PISS oxygen

Answer 10

green

2 & 5

Question 11

Oxygen E cylinder

Answer 11

2000psi
625-700L
as O2 used, pressure falls proportionally

1/2 tank: 1000psi, 312.5L

Question 12

flowmeter

Answer 12

purpose: measure gas flow to common gas outlet
thorpe/electronic
safety feature:
- gas coloring
- O2 knob distinctively fluted, projects beyond control knobs of other gases, larger in diameter
- O2 flow meter positioned downstream from nitrous prevents hypoxic mis if leak present but not fail proof