Gas Machine Flashcards
What type of equipment was involved (and the percentage)in 88% of cases which had mortality/ morbidity noted.
- breathing circuit 39%
- Oxygen supply tanks/ lines 11%
Gas Machine Definition
A device which delivers a precise-known but variable gas mixture, including anesthetizing & life sustaining gases
Misuse of equipment counted for what percentage in cases leading to mortality/ morbidity?
75% (3x more common than equipment failure at 24%)
Vaporizers accounted for what percentage of the 83% of claims from 1990-2011?
35%
How much did the breathing circuit accounted death/morbidity in 83% of claims from 1990-2011. What was the cause of this?
4 cases r/t obstruction of circuit due to sticking inspiratory or expiratory unidirectional valves
85% of all errors involve_____
provider error
What’s the normal working pressure of the machine?
50 psi
How much flow from the oxygen flush?
35-75L/min
NIOSH Standard for halogen WAG (with & w/out N2O)
2 ppm
0.5 ppm with N2O
what is WAG
waste anesthesia gas
NIOSH standard for nitrous oxide WAG
25ppm
What are scavenger tube sizes
19 or 30mm
Size of ETT or CGO (common gas outlet)
15mm
Size of the breathing circuit
22mm
What is the gas machine standard
ASTN F1850 Anesthesia workstation standard (per the industry advising group)
How many liters per second is 35-75L/min O2
1L/sec
What helps prevent exposure to WAG
scavenging
What is the function of the ASTM F1850
Specifies what is needed for an anesthesia work station (typically built into new machines)
ASTN F1850 required components
not sure if on exam…each topic has more details written in notes/ N&P
- Back up batteries for 30 min.
- Alarms (high, medium, and low priority alarms)
- Required monitors (ex. O2 supply failure, ETCO2, EKG, etc.)
- Pressure in breathing circuit limited to 12.5kPa (125cm H20)
- Non-detachable/ resistant to detaching electric supply cord
- Cylinder supplies
- Flow meters
- O2 flush capable of 35-75L/min flow that doesn’t proceed through any vaporizers
- Vaporizers
- Only 1 common gas outlet @ 22-mm outer diameter, 15mm inner diameter designed to prevent accidental disconnection
- Pipeline gas supply
- Checklist provided
- Digital data interface
Five tasks of O2
- Ventilator
- Oxygen Pressure fail alarm (decrease pressure)
- Flush valve
- Flowmeter
- “Fail Safe” (pressure sensor shutoff valve)
That does “SPPD” (model) mean?
- Supply
- Processing
- Delivery
- Demand
What components of the gas machine are in the “High” pressure category? (5)
- Pressure Regulator
- Hanger Yoke
- Yoke block with check valves
- Check Valve
- Cylinder Pressure Gauge
High-Pressure system is exposed to what type of pressure?
Cylinder pressure
Low Pressure Circuit components of AGM & its location
(Located distal to flowmeter needle valve)
- Flowmeters (tubes)
- Vaporizers (calibrated)
- Check valve (if present)
- common gas outlet
- Flow control valve (on handout)
Intermediate parts of AGM and its location
(exposed to pipeline pressure, 50psi)
- Pipeline inlets
- Ventilator power outlet
- O2 pressure-failure devices
- Flowmeter valve
- O2 2nd stage regulator
- Flush valve (oxygen)
***Where is O2 added to the machine and why that location
Added to the COMMON MANIFOLD downstream to prevent O2 lost if there’s a leak (leak more likely to happen upstream)
***Where does O2 first mix with other gases
common manifold
What part of the AGM seperates components wMin the machine from external components
The common gas outlet (machine outlet)
How many tasks does N20 & air have each w/in the AGM
One
How many tasks does O2 have & what are they
(5)
- Low pressure alarm (Oxygen pressure failure alarm) (Notifies if loss or decrease in pressure)
- Ventilator driving gas
- O2 flush valkve
- Fail safe
- Flow meter
***What are shrader valves & what component of the AGM do they belong?
- part of the supply system
- “quick connects” where machine connects & disconnects from wall gases
What are the concerns of the concept of supply
- How gases & electrical power come into the AGM
- What are the likely faults & hazards (Naglehout p. 245)
What 2 things are included with “Supply”
Pipeline & cylinders
**Supply of gases pipeline source includes….
- The primary gas source
- DISS (Diameter index safety system) pipeline connector
- Pipeline check valve (prevents gas from leaking)
- Pipeline gauges
***What equipments are part of the pipeline
- Wall outlets
- Connecting valves & holes
- Filters & check valves
- Pressure gauges
Parts of the Cylinder
- hanger yokes, (Yoke block)
- filters & check valves
- Pressure gauge
- pressure regulator
What is a hanger yoke
part that allows cylinder tank to orient to machine
