Anesthesia Machine Components Flashcards
Compressed Gases
Gases / Liquids under high pressure
* used as carrier gas for inhaled anesthetics
* examples: oxygen and nitrogen
* color coded
* attach to machine via yoke or high-pressure hose
Pressure Regulator
Indicates amount of gas contained in cylinder
* reduces the high pressure gas exiting cylinder to a low pressure
* allows machine to operate on lower pressure - easier and safer for patient
Flowmeter
Controls the rate that a carrier gas is delivered
* gas specific
* mL/ min or L/ min
Anesthetic Vaporizers
Used to deliver precise concentration of specific inhaled anesthetic
* converts liquid anesthetic into a vaporized form
* can be located VIC or VOC
* examples: isoflurane or sevoflurane
Oxygen Flush Valves
Delivers fresh oxygen to common gas outlet
* bypasses the vaporizer
* used for pressure-testing and flushing the system
CO2 Absorbent Canister
Chemically removes CO2 from patient’s exhaled air
* change every 6-8 hours of use
* granules color change to blue when exhausted - can change back to white over time
Pressure Relief Valve
(Pop-Off)
Allows excess pressure in the system to escape
* valve can be closed to manually breathe for patient or pressure testing machine
Scavenging Systems
Collects waste gases and disposes of them properly
* passive: canister of activated charcoal used
* active: vacuum or other device to draw waste gas towards the outside
Reservoir Bag
Collects oxygen and anesthetic gas before being delivered to patient
* can be used to manually breathe for patient
* prevent immediate pressure buildup if pop-off is closed
* different sizes depending on patient’s tidal volume
Rebreathing Tubes
Connects anesthetic machine to patient
* pediatric: less than 5 kg
* adult: more than 5 kg
* universal-F
Universal-F
Rebreathing Tube
Inspiratory tube runs inside of expiratory tube
* expired air warms inspired air - aids patient’s warmth
Pressure Manometer
Indicates amount of positive pressure in system
* unit measured in cm of H2O
