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Machines > Scavenging > Flashcards

Scavenging Flashcards

1
Q

What collects 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

A

scavenging system

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2
Q

What captures gases at site of emission?

A

Gas-collecting assembly

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3
Q

What carry collected gases to interface?

A

Transfer tubing

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4
Q

What provides positive (& sometimes negative) pressure relief & may provide reservoir capacity?

A

interface

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5
Q

What carries gases to point where they are discharged?

A

Gas disposal system

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6
Q

Location of gas collecting assemblies:

A
  • Breathing systems
  • Ventilators
  • Respiratory gas monitors
  • Leak sites
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7
Q

What describes these characteristics?

  • A length of tubing with a connector at either end
  • As short as possible
  • Wide enough to carry high flows without significant pressure increase
  • 19 or 30-mm inlet/outlet fittings
  • Resistant to kinking & occlusion
  • Easy to see & disconnect
  • Different color than breathing system
A

transfer tubing

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8
Q

An open interface scavenging system has a _____ _____ ____.

A

positive pressure relief

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9
Q

What interface has these characteristics?

  • Has 1 or more openings to atmosphere
  • Contains no valves
  • Reservoir needed to hold gas surges
  • Reservoir allows disposal system flow rate to be above gas-collecting assembly flow rate
  • Should only be used with active disposal
  • Safety depends on patency of vents to atmosphere
A

open interface

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10
Q

Anesthetic gases from transfer means enter at the top of the _______& are conducted to base where they are dispersed

A

reservoir

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11
Q

A closed interface scavaging system connects to atmosphere through ______.

A

valves

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12
Q

Positive pressure relief valve always required in an open interface. True or false?

A

false, in a CLOSED one

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13
Q

Negative pressure relief valve required only with _______ disposal system.

A

active

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14
Q

Reservoir not required in an ____ _____ system.

A

closed interface

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15
Q

Positive Pressure Relief Only used only with a ______ disposal system

A

passive

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16
Q

Positive & Negative Pressure Relief
Used only with _____disposal system

A

active

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17
Q

In a passive negative pressure relief valve always closed. True or false?

A

true

18
Q

In an active, closed system, _______ pressure relief valve closes during high flows from gas-collecting assembly

A

negative

19
Q

In a closed, active system, negative pressure relief valve ____ when gas-disposal assembly flow is greater than flow of gases entering gas-collecting assembly

A

opens

20
Q

In the closed system, if bag continually collapsed or negative pressure relief valve opens frequently, then ____ the ____

A

lower the flow

21
Q

In a closed system, if bag is distended or positive pressure relief valve opens frequently, _____ flow

A

increase

22
Q

Gas disposal tubing is ______ and ______ tubing with passive systems to minimize resistance

A

short

wide

23
Q

Scavenging tubing colors are usually ______or _____

A

purple

yellow

24
Q

What disposal system do these characteristics describe?

  • Pressure is raised above atmospheric by patient exhaling, by manually squeezing the reservoir bag, or by a ventilator
  • There is positive pressure in gas-disposal tubing
A

passive

25
Q

Active or passive disposal?

  • Room ventilation system
  • Piping direct to atmosphere
  • Absorption device
A

passive

26
Q

Circulating or noncirculating of passive disposal?

  • Takes in fresh air & processes it by filtering & adjusting humidity & temperature
  • Processed air is circulated thru the room then all expelled to atmosphere
  • Attach disposal tubing to exhaust grille
A

noncirculating

27
Q

Recirculating or noncirculating of passive disposal?

  • A small amount of air taken in from atmosphere while remaining air is recirculated
  • The volume of fresh air taken in is equal to the amount exhausted
  • Waste gases must be vented beyond recirculation point
A

recirculating

28
Q

Piping Direct To Atmosphere benefits (2)

A
  • Easy to use
  • Low maintenance costs
29
Q

Problems of passive disposal? (3)

A
  • Positive/negative pressure caused by wind currents or obstruction
  • Need to ensure system patency
  • Requires special installation
30
Q

What:

  • Removes anesthetic agents by converting them to harmless substances
  • Usually activated charcoal in canisters
  • Efficiency depends on agent, flow rate thru canister, & moisture
A

absorption device

31
Q

Disadvantages of passive absorption system: (6)

A
  • Expensive
  • Short life span
  • Storage/disposal problems
  • Requires monitoring or weighing to determine whether adsorber is saturated
  • Significant resistance with large canister
  • CAN NOT ABSORB N2O
32
Q

Passive disposal system advantages:

A
  • Simpler than active systems
  • Less expensive than active systems
33
Q

Passive disposal is not as effective in lower trace gas levels because____ ____ promotes outward leaks.

A

positive pressure

34
Q

What disposal is this?

  • Uses a flow-inducing device to move gases
  • There is negative pressure in gas-disposal tubing
A

active disposal

35
Q

Examples of active disposal system: (2)

A

Piped vacuum
Active duct system

36
Q

Piped Vacuum Problems (6)

A
  • Inadequate number of vacuum outlets
  • Inconvenient outlets
  • System overload
  • Damage to vacuum system
  • Personnel exposure
  • Inconvenience
37
Q

What system is this?

  • A dedicated evacuation system that leads to outside
  • Uses flow-inducing devices (fans, pumps, blowers, etc.)
  • Moves large volumes of gas at low negative pressures
  • Negative pressure prevents contamination & atmospheric conditions from affecting outflow
A

active duct system

38
Q

Active Duct System Advantages (2)

A

Resistance is not a problem
Wind does not affect system

39
Q

Disadvantages of what system?

  • Complex
  • Requires negative pressure relief & reservoir capacity in interface
  • Requires special installation
  • Flow-inducing device requires added energy & maintenance
A

active disposal

40
Q

Disadvantages of active disposal system: (4)

A
  • Expensive
  • Not automatic (must be turned on/off)
  • More complex than passive systems
  • Requires interface to have negative pressure relief

Machines (7 decks)

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