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Flashcards in scavenging Deck (29):
1

what is the most important step in reducing trace gases?

scavenging

2

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

3

In scavenging, what Captures gases at site of emission
 

Gas-collecting assembly
 

4

In scavenging what carries collected gases to interface
 

transfer tubing

5

In scavenging what provides positive (& sometimes negative) pressure relief & may provide reservoir capacity
 

the interface

6

what carries gases from interface to gas disposal system
 

gas-disposal tubing

7

what carries gases to point where they are discharged
 

gas disposal system

8

what size fitting is on gas collecting assembly of the scavenging system?

30 mm male

9

what type of gas collecting assembly breathing system does not have a APL valve?

T- piece system

10

True or false. Waste gas is directed to the same interface used by breathing system

true

11

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

12

what Prevents pressure increases/decreases in scavenging system from being transmitted to breathing system or ventilator
 

interface

13

where should interface be positioned?

close to gas-collecting assembly as possible

14

What are the components of an interface

Positive pressure relief
Negative pressure relief
Reservoir capacity
 

15

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
 

16

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. 
 

17

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

18

True or False.  Positve and Negative pressure relief is used only with closed active disposal

True

19

In a closed active scavenging system when does the pressure relief valve close

during high flows from gas-collecting assembly
 

20

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

21

what should be done when the scavenging reservoir bag continually collapsed or negative pressure relief valve opens frequently

lower the flow

22

what should be done when the scavenging reservoir bag is distended or positive pressure relief valve opens frequently

increase flow

23

what colors are scavenging tubes usually?

purple

or

yellow

24

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
 

25

what are advantages of active duct active disposal

Resistance is not a problem
Wind does not affect system
 

26

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
 

27

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
 

28

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
 

29