E3 - Anesthesia Machine I Flashcards
What must the anesthesia machine provide: Select 3
A. place to prop your feet during long cases
B. accurate and safe gas delivery
C. not a place to store anything
D. audible alarms
E. electrical outlets
F. housing for monitoring devices
B. Provide accurate and safe gas delivery
E. Provide electrical outlets
F. Provide a housing for monitoring devices
and:
* Provide a means for ventilating patients
* Provide storage/shelving
What features of the anesthesia still work if the Master Switch is OFF? select 2
A. alarms and safety features
B. battery charger
C. electrical outlets
D. power-up protocol
E. pneumatic functions
B. Battery charger
C. Electrical outlets
AND:
* Oxygen flush valve
* auxiliary oxygen flowmeter
What is the best way to save power on your ventilator if you lose power during an operation?
A. use the battery charger that is available
B. switch machine plug to a red electrical outlet
C. switch from control ventilator to manual ventilation
D. turn off the o2 flush valve mechanism
C. Switch from control ventilator to manual ventilation
What are the electrical outlets on the anesthesia machine used to power?
A. pneumatic system
B. anesthesia monitors only
C. other appliances
D. anesthesia monitors and other appliances
B. Anesthesia monitors only
Other appliances should be plugged into hospital’s main outlets
If requirements exceed outlet; circuit breaker will activate
What are the 3 parts of the pneumatic system?
- High Pressure
- Intermediate Pressure
- Low Pressure
The high-pressure system receives gas from the ____ at high variable pressure.
A. rises
B. central supply
C. branch
D. cylinders
D. Cylinders (25 - 2200 PSI)
The pressure needs to be reduced to a lower, more constant pressure (like 45 psi) suitable for use in the anesthesia machine
What is the purpose of the pressure regulator (1st stage regulator) on the anesthesia machine?
A. reduce to lower pressure
B. increase to higher pressure
C. reduce or increase pressures depending on where the cylinder pressure is at
D. constantly change flowmeters
A. reduce to a lower, more constant pressure (45 psi)
Without regulators, we’d constantly be changing flowmeters
What is the purpose of the Hanger Yoke? Select 3
A. provide a gas-tight seal
B. reduce pressure to lower psi
C. allows bidirectional flow
D. ensures unidirectional flow
E. increase pressure to higher psi
F. orients and supports the cylinder
A. Provide a gas-tight seal
D. Ensures unidirectional flow
F. Orients and support the cylinder
It is REQUIRED to have at least 1 hanger yoke for oxygen and 1 hanger yoke for nitrous
What are the 6 parts of the Hanger Yoke?
- Body - principal framework
- Retaining screw - tightens cylinder (clamp)
- Nipple - thru which gas enters the machine
- Index pins - prevents attaching an incorrect cylinder (PISS)
- Washer - forms seal between cylinder and yoke
- Check valve assembly - ensure unidirectional flow!!!!
BRNIWC
The check valve assembly of the hanger yoke prevents: Select 2.
A. gas from entering machine when theres not cylinder in the yoke
B. gas from being transferred from a cylinder with lower pressure to one with higher pressure
C. gas from exiting the machine when there is no cylinder in the yoke
D. gas from being transferred from a cylinder with higher pressure to one with lower pressure
C. Prevent gas from exiting the machine when there is no cylinder in the yoke
D. Prevent gas from being transferred from a cylinder with higher pressure to one with lower pressure (IF both are in a yoke and ON) (so uses the oldest one first)
Cylinder pressure indicators work by using a __ gauge which consists of a tube bent into a coil or an arc.
A. thread
B. snap
C. bourdon
D. plug
C. Bourdon gauge consists of a tube bent into a coil or an arc.
Gauge required to be calibrated to kPa or psi
Describe the bourdon gauge inside of the cylinder pressure indicator:
As the pressure in the tube __ (increases or decreases) , the coil __ (winds up or straightens).
As the pressure in the tube increases, the coil unwinds/straightens.
- A pointer connected to the end of the tube can be attached to a lever and a pointer calibrated to indicate pressure.
required to be calibrated in kilopascals (kPa)
What describes the intermediate pressure system? Select 2
A. receives pressure from the pressure regulator at 35 psi
B. receives pressure from the pipeline at 50-55 psi
C. it is downstream of flow control devices
D. pressure is slightly above atm
E. if master switch is OFF, pressure is zero
B. Receives pressure from the pressure regulator (45 psi) or from the pipeline (50-55 psi)
E. if master switch is OFF, pressure is zero
What is included in the intermediate pressure system? Select 3
A. Pneumatic part of the master switch
B. Pipeline inlet connections
C. Oxygen flush valve
D. Check valve assembly
E. Hanger Yoke
F. Flowmeters
A. Pneumatic part of the master switch
B. Pipeline inlet connections
C. Oxygen flush valve
also:
* Piping
* Oxygen pressure failure devices
* Flow control valves
D & E are part of high pressure system ; F is part of low pressure system
What is the pipeline inlet connection? What safety system accompanies this connection?
A. entry point for gases from pipelines; PISS
B. entry point for gases from pipelines; DISS
C. exit point for gases from pipelines; PISS
D. exit point for gases from pipelines; DISS
B. entry point for gases into anesthesia machine from pipelines; DISS
Pipeline inlet connects are fitted with a diameter index safety system (DISS)
The anesthesia machines are required to have pipeline inlets for what 2 gases?
Required: Oxygen and Nitrous
and most also have air
Where are the pipeline pressure indicators usually found?
And where should these pipeline pressure indicators be measuring pressure from?
On the front of the anesthesia machine!
digital or newer machines have LED
Should be measuring pressure on pipeline side!!
* if downstream and cylinder valve is open, then the indicator would display an adequte pressure reading until cylinder is 0 and fully empty…
What are the standards for the oxygen flush?
A. must be operable w/ 1 hand
B. multi purpose
C. self-closing
D. designed to minimize accidental use
E. have flow between 35-75 L/min
F. all but B
G. all but B and C
H. all of the above
F. ALL BUT B
Entire list:
* Must be operable with 1 hand
* Single purpose
* Self-closing
* Designed to minimize accidental use
* Have flow between 35-75 L/min (can cause barotrauma)
What details must the flow adjustment control (knobs) have? Select 2.
A. can have 2 controls for each gas
B. only one control for each gas
C. must be on opposite side of flowmeter
D. must be adjacent to its flowmeter
B. only one control (knob) for each gas
D. must be adjacent to its flowmeter
can be mechanical or electronic
What is unique about the oxygen flow knob?
A. smooth and larger than other gases
B. smooth smaller than other gases
C. fluted and smaller than other gases
D. fluted and larger than other gases
D. It must be fluted and larger than other gases (looks and feels different)
The flowmeter indicates the rate that gas is passing through. Describe the design of a flowmeter: Select 2.
A. horizontal glass tube
B. smallest diameter at top
C. free floating indicator
D. a stop at top of tube
E. larger diameter at bottom
C. free floating indicator
D. with a stop at top of tube
It’s a Thorpe (vertical glass) tube with smallest diameter at the bottom and a flow scale
What is the flowmeter sequence for normal gas flow?
A. left to right: top to bottom
B. right to right: top to bottom
C. bottom to top; left to right
D. bottom to top; right to left
C. Normal gas flow = bottom to top and left to right
we want either C (Drager) or D (Ohmeda) in the picture aka fail-safe bc O2 is on the far right!
The minimum oxygen ratio is a gas ratio between:
A. air and O2
B. O2 and nitrous
C. CO2 and O2
D. O2 and volatile anesthetic
B. Gas ratio between oxygen and nitrous
What component receives all gases from the machine and delivers the mixture to the circle system?
A. flowmeter
B. unidirectional valves
C. thorpe tubes
D. common gas outlet
D. Common gas outlet
it MUST be difficult to disconnect
What can deliver oxygen in case of an electronic power failure?
A. common gas outlet
B. flow adjustment control
C. alternate o2 control
D. o2 flush
C. Alternate Oxygen Control
If you press this button, everything shuts off but this oxygen back up supply.
