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
scavenging system
What captures gases at site of emission?
Gas-collecting assembly
What carry collected gases to interface?
Transfer tubing
What provides positive (& sometimes negative) pressure relief & may provide reservoir capacity?
interface
What carries gases to point where they are discharged?
Gas disposal system
Location of gas collecting assemblies:
- Breathing systems
- Ventilators
- Respiratory gas monitors
- Leak sites
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
transfer tubing
An open interface scavenging system has a _____ _____ ____.
positive pressure relief
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
open interface
Anesthetic gases from transfer means enter at the top of the _______& are conducted to base where they are dispersed
reservoir
A closed interface scavaging system connects to atmosphere through ______.
valves
Positive pressure relief valve always required in an open interface. True or false?
false, in a CLOSED one
Negative pressure relief valve required only with _______ disposal system.
active
Reservoir not required in an ____ _____ system.
closed interface
Positive Pressure Relief Only used only with a ______ disposal system
passive
Positive & Negative Pressure Relief
Used only with _____disposal system
active
In a passive negative pressure relief valve always closed. True or false?
true
In an active, closed system, _______ pressure relief valve closes during high flows from gas-collecting assembly
negative
In a closed, active system, negative pressure relief valve ____ when gas-disposal assembly flow is greater than flow of gases entering gas-collecting assembly
opens
In the closed system, if bag continually collapsed or negative pressure relief valve opens frequently, then ____ the ____
lower the flow
In a closed system, if bag is distended or positive pressure relief valve opens frequently, _____ flow
increase
Gas disposal tubing is ______ and ______ tubing with passive systems to minimize resistance
short
wide
Scavenging tubing colors are usually ______or _____
purple
yellow
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
passive
