scavenging Flashcards
what is the most important step in reducing trace gases?
scavenging
what is Collection of excess gases from equipment used to administer anesthesia or exhaled by the patient & the removal of these gases to an appropriate place of discharge outside the work environment
scavenging
In scavenging, what Captures gases at site of emission
Gas-collecting assembly
In scavenging what carries collected gases to interface
transfer tubing
In scavenging what provides positive (& sometimes negative) pressure relief & may provide reservoir capacity
the interface
what carries gases from interface to gas disposal system
gas-disposal tubing
what carries gases to point where they are discharged
gas disposal system
what size fitting is on gas collecting assembly of the scavenging system?
30 mm male
what type of gas collecting assembly breathing system does not have a APL valve?
T- piece system
True or false. Waste gas is directed to the same interface used by breathing system
true
what is important about transfer tubing
as short as possible
wide enough to carry high flows with out significant pressure
19 - 30 mm inlet/outlet
resistant to kinking
what Prevents pressure increases/decreases in scavenging system from being transmitted to breathing system or ventilator
interface
where should interface be positioned?
close to gas-collecting assembly as possible
What are the components of an interface
Positive pressure relief
Negative pressure relief
Reservoir capacity
what are the features of a closed interface
Connects to atmosphere thru valves
Positive pressure relief valve always required
Negative pressure relief valve required only with active disposal system
Reservoir not required
What is the purpose of the positive pressure relief valve?
always required to allow gases to be released into the room if there is obstruction of the scavenging system downstream of the interface.
what is the purpose of the negative pressure relief valve?
(pop-in, inlet relief) valve is necessary to allow air to be entrained when the pressure in the reservoir falls below atmospheric
True or False. Positve and Negative pressure relief is used only with closed active disposal
True
In a closed active scavenging system when does the pressure relief valve close
during high flows from gas-collecting assembly
in a closed active scavenging, Negative pressure relief valve opens when
gas-disposal assembly flow is greater than flow of gases entering gas-collecting assembly
what should be done when the scavenging reservoir bag continually collapsed or negative pressure relief valve opens frequently
lower the flow
what should be done when the scavenging reservoir bag is distended or positive pressure relief valve opens frequently
increase flow
what colors are scavenging tubes usually?
purple
or
yellow
what are the features of an active disposal system?
Uses a flow-inducing device to move gases
There is negative pressure in gas-disposal tubing
what are advantages of active duct active disposal
Resistance is not a problem
Wind does not affect system
what are disadvantages of acitve duct active disposal?
Complex
Requires negative pressure relief & reservoir capacity in interface
Requires special installation
Flow-inducing device requires added energy & maintenance
what are overall advantages of active disposal system
Usually more effective at keeping pollution levels low
Allow small-bore tubing
No excessive resistance
Aid in room air exchange
what are overall disadvantages of active disposal system
Expensive Not automatic (must be turned on/off) More complex than passive systems Requires interface to have negative pressure relief
