week 2 - anesthesia machines Flashcards
Computer-driven machines should be turned ___ and restarted every __ hours, this is called a __-___
off
24
self-checkout
Anesthesia workstations and their components are covered by the ____
American Society for Testing and Materials (ASTM)
Only __ __ should by plugged into the machine’s electrical outlets.
anesthesia monitors
The backup battery power should last at least __ minutes
30
When gas travels from the high pressure cylinder to the machine, a ___ ___ decreases pressure to __ psig.
pressure regulator
50
The __ __ orients and supports the cylinder, provides a __ __ seal, and ensures ____ flow.
hanger yoke
gas tight
unidirectional
Three components exposed to high pressure are
hanger yoke
cylinder pressure gauge
cylinder pressure regulators
Check valves allow gas to enter the machine but prevent gas from exiting the machine when __
there is no cylinder in the yoke
Cylinder and pipeline pressure gauges are __ __ which stretch with pressure and point to correct pressure (“___” gauges)
metal needles
“Bourdon” gauges
Three pneumatic components of the intermediate pressure system include the __
master switch,
oxygen failure devices,
flow control devices
Four accessories supplied by oxygen include __
ventilators
accessory flowmeters
jet ventilation
oxygen flush
__ __ direct a high unmetered flow directly to the __ __ __ (35-75 L/min) and do not require activation of the __ __
Flush buttons
common gas outlet
master switch
Four flush hazards include __
leaks
sticking and obstructing flowmeter output
barotrauma
awareness
Machines possess a pneumatic or electronic alarm device that sounds a warning when the oxygen supply pressure decreases to below __ psig
30
The “__ __” valve (oxygen pressure sensor shut-off valve) will decrease supply of other gases as the oxygen supply pressure decreases, typically below __ to __ psig.
“fail-safe”
20-25 psig
Reducing devices just upstream of flow valves decrease pressure a second time (__ to __ psig)
15-19 psig
Four machine components exposed to low pressure systems include __
flowmeter tubes
vaporizers
check valves
common gas outlet
The most common means of regulating flowmeter rate is a __ __
needle valve
Traditional flowmeters are __ tubes, which are vertical glass tubes tapered with its __ diameter at the bottom
Thorpe
smallest
Physical properties of the gas affect the flowmeter indicator and include __, __, __ of the float, and __ of the tube.
viscosity
density
weight
annulus
Flowmeters are __ coded, and the flow control knob for oxygen is __ and __ differently
color
larger
shaped
__ flowmeters are read from the top, while __ floats are read from the middle
Bobbin
ball
Three factors that affect flowmeter accuracy include
back pressure from a ventilator
static electricity/dirt
float stuck at the top of a Thorpe tube
The common gas outlet should or should not by used to administer supplemental oxygen to the patient?
SHOULD NOT
