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41 Cards in this Set
- Front
- Back
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to prevent depletion of backup gas supplies do this after cracking cylinder to check pressure
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close valve
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"fail-safe" mechanism uses a ___ to detect decreased O2 ___
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diaphragm, pressure
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positive pressure leak check by Y-connector manual occlusion only detects leaks to ___
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check valve
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positive pressure leak check is a ___ dependent check
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volume
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When the O2 flush valve is depressed, the line will be depressurized (T/F).
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Only if there is no open O2 supply, e.g. open cylinder or connected wall hose.
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4 circuits
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high pressure
low pressure breathing scavenging |
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In the event that the wall supply is pressurized, what would you have to do to switch to cylinder supply?
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Disconnect wall supply because its higher pressure will activate cylinder check valve.
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A thorough leak check includes each vaporizer (independently, simultaneously).
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independently
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possible cause of CO2 in inspiratory line
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stuck expiratory valve due to humidity
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normal CO2 concentration in inspiratory line
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zero
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hose compliance and extra tubing length (increases/decreases) dead air space and (increases/decreases) tidal volume needed for ventilation
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increases, increases
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breathing circuit disconnect would be more difficult to detect in which type of ventilator bellows
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hanging
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pressure dependent leak check
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negative pressure or bulb at CGO
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CGO
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common gas outlet
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volume dependent leak check
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positive pressure occlusion at APL and Y-connector
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because it is volume dependent, this leak check is not sensitive enough to detect leaks upstream from the CGO
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positive pressure check
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full O2 tank pressure
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1900 psi
130 atm |
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full N2O tank pressure
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745 psi
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half N2O tank pressure
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745 psi
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half O2 tank pressure
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950 psi
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O2 pipeline supply pressure
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55 psi
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O2 cylinder supply pressure
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40-45 psi
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Which is greater? Pipeline supply pressure or cylinder supply pressure? Why?
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pipeline, so switches to cylinder when falls below cylinder supply pressure
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list in order the major components of the anesthesia machine before the CGO
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O2 supply
on/off switch O2 low pressure alarm anesthesia ventilator driving gas circuit fail-safe or OFPD second stage regulator flowmeters vaporizers pressure relief valve outlet check valve CGO |
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OFPD
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oxygen failure protection device
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line pressure after second stage regulator
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14 psig
2 atm |
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reason for second stage regulator
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upstream pressure variation will not affect downstream O2 concentration
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functional difference between fail-safe and OFPD
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diaphragm vs. spring/pin
positive on/off of N2O vs. gradual decrease |
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vaporizer interlock system consequence
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only one vaporizer can contribute to line at a time
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uses for O2 flush valve
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emergency O2 delivery
quick charge circuit depressurize system |
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modifications for insuring delivery of min. O2
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fail-safe or OFPD
linked valves minimum O2 flow built in bobbin spins flowmeter order DISS/PISS |
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gas flow through vaporizer depends on positive pressure upstream
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plenum vaporizer
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gas flow through vaporizer depends on negative pressure downstream
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draw-over vaporizer
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early plenum vaporizer
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Boyle's bottle
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effect on temperature of anesthetic as gas passes through it
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decreases due to vaporization
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effect of cooling of anesthetic on vaporization rate
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decreases
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concentration of anaesthetic leaving a Boyle's bottle depends on...
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gas flow
temperature |
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partially overcomes problem of flow dependence in vaporizer
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vapor saturation in vaporizing chamber
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vaporizers are made of metal because...
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metal conducts heat and stabilizes temperature during vaporization
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liquid injection of anesthetic adjustable by throttle is designed to avoid...
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temperature related changes in anesthetic concentration
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a heated chamber and variable rate solenoid release a certain number of moles of anesthetic independently of...
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gas flow rate
adiabatic changes |
