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How long will the anesthesia machine backup battery last?
What does it depend upon?
What society creates the standard for the current anesthesia machines? And, the policy name
- 1. American Society for Testing & Materials.
- 2. F1850
How are anesthesia machine alarms grouped?
How long does a High priority alarm last?
Examples of Alarms
- 1. Low, medium, & high.
- 2. High priority alarms can not be silence > 120 seconds.
- 3. Breathing circuit pressure, O2 conc., Exhaled vol. or CO2.
What are the 1st 7 of the 13 Required safety components?
- 1. High priority Pressure alarms
- 2. Disconnect alarms
- 3. Required Monitors
- 4. A Hypoxic guard prevent < 21% O2
- 5. Vapor concentration monitor
- 6. Must have Pulse Ox, B/P monitor, & EKG
- 7. Breathing circuit limit 12.5kPa (125mmHg H20).
What are the last 6 or the 13 required safety components?
- 8. Electric supply cord
- 9. O2 cylinder
- 10. Flowmeter
- 11. Auxiliary strongly recommended
- 12. O2+ flush Highly recommended 35-75L/min
- which bypasses vaporizers.
- 13. Vaporizer Features
Key O2 component of 13 safety requirements.
- 1. O2 flowmeter must have a unique knob
- 2. must be all the way to the right
- 3. O2 enters downstream of gases.
Whats the different between the Master and Mains power switch?
- 1. Master switch is the on/off button of the machine. ex. computer on/off button.
- 2. Mains switch controls all incoming electrical flow. ex. computer power cord that plugs into back of computer.
What are the 4 C's if one were to loose mains power?
- 1. communicate
- 2. check power cord
- 3. check power outlet
- 4. CONSERVE power
ASTM requires how much batter reserve time?
Where can you find battery status amnt?
- 1. 30 mins.
- 2. System status menu
Electrical outlets should only be used for?
Electrical outlets should especially not be used for?
When are these outlets inactivated?
- 1. Monitors
- 2. Anything that produces heat. b/c only capable of delivering <360 watts = 3 amps
- 3. When mains switch is off
What are the 3 sub-systems of of Pneumatic system?
- 1. High, intermediate, and low pressure stages.
- 2. Each stage/system has a parallel line for each individual gas.
Where is the primary 1st stage regulator, and what does it do?
- 1. between the High pressure stage 800- 1800 psi and the intermediate stage (50psi).
- 2. Down regulates the high pressure of O2 cylinders
O2 cylinder is primarily used for back up? T/F
O2 cylinder should be fully opened when using and only cracked open to check for pressure.
1. The 1st stage regulator down regulates tank pressure to what psi? Why is this?
2. What prevents back flow?
3. What is intermediate pipeline pressure?
- 1. 1st stage 45-50 psi pipe pressure.
- 2. If This wasn't done, tank would be used. so, regulated down to just below intermediate/wall pressure so that wall gas is utilized rather than tank. Wall pressure then is slightly higher than down regulated 1st stage.
- 3. 50-55 psig
- 3. Check valve
What valve prevents increase in pressure from either pipeline surge or failure of the high pressure regulator?
1. Pressure relief valve
What is the last point of the intermediate system?
Flow meters to O2, N20, Fresh gas.
What is DISS?
1. Diameter Index Safety System. Prevents N2O hoses from being connected to O2 inlet and vice versa.
What are US gas color correlation?
- O2 = green
- Air = yellow
- blue = Nitrous Oxide
1. What is the pressure and flow of O2 bypass/O2 flush/emergency flush and why?
2. Where does O2 flush come from and where does it empty?
- 1. 45-55 bc it comes from/just after 1st stage regulation. So, it will come from pipeline pressure 50-55, or tank pressure 45-55 if pipeline pressure is low.
- 2. Just after 1st stage regulator and Directly into Common Gas Outlet (CGO)
1. In the event of a surge in Pipeline pressure or pressure regulator failure, what valve will open to prevent to much pressure in the system?
2. What valves prevent back flow from tank to tank, pipeline to tank, and tank to pipeline?
- 1. Pressure relief valve.
- 2. Tank check valves and Pipeline check valves.
1. What does the Oxygen Bypass Bypass?
- 1. Sec. pressure regulator
- 2. flowmeters
- 3. Master switch
1. If master switch is off, will the flowmeters work.
2. Will the O2 flush work?
1. What are the two names of the systems that prevents O2 mixture from becoming hypoxic and how do they function?
- 1. Oxygen failure safety device (aka-Fail Safe)
- - In gasline and senses O2 amnt. Will decrease or shut off the non-O2 gas flow.
- 2. Oxygen supply failure alarm. Will alarm is <5 seconds if pressure drops below 30psi.
- Both depend on pressure not flow.
1. What two gases should never be used together?
1. Nitrous Oxide and Air
1. What is the second stage pressure regulator and what pressure does it down regulate too?
- 1. 14psi for O2
- 2. 16psi for N2O
- - prevents pressure fluctuations at flowmeters.
1. Atmospheric pressure, 760 torr, is equal to how many psi?
2. low pressure stage is slightly above atmospheric pressure? T/F.
1. Flowmeters are calibrated to what pressure atm and what temp? Why?
2. Flow rate depends on What 3 things?
- 1. 760 Torr and 20 C. This will fluctuate with changes in altitude and temp. Higher elevation will be higher flow bc less resistance.
- 2. a. pressure drop across constriction
- b. Size of annulus
- c. Physical properties of gas.
What is the Auxillary, sideport meter or courtesy flowmeter?
1. Does not require machine to be on.
1. Problems with flowmeters?
- 1. Must be level to work
- 2. leaks distally will deliver less flow
- 3. Flowmeter sequence of O2 and AIR alters flow.
- 4. Gas specific.
1. What is a hypoxia prevention device?
2. Give example
- 1. prevents N2O flow from becoming a hypoxic mixture.
- 2. link 25, and ORMC - Oxygen Ration Monitor System.
What do the unidirection check valves do after the vaporizers?
1. Prevent backflow during PPV positive pressure ventilation back the CGO to Vaporizers.
1. What is the common gas outlet?
2. What should it not be used for?
- 1. It delivers ALL gas and vapors to the breathing system.
- 2. Supplemental O2 delivery.
1. What is the APL valve?
2. What must be turned off for APL valve to work?
- 1. Adjustable Pressure Limiting Valve "Pop-off" valve.
- - Only used during manual or spontaneous ventilation. Only gas exit from breathing circ. unless ventilator is being used. Spill valve to scavenger is used when vent is on and APL used when vent. is off.
- 2. Ventilator or
1. During spontaneous ventilation APL valve should be fully?
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