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Parts of anesthesia machine
Terms in this set (40)
master switch. turns on electrical ad pneumatic power
electrical outlets on back of anesthesia machine protected by circuit breakers. only for anesthesia equipment and nothing that heats
E cylinder. used in emergency situations
hanger yoke. orients and secures cylinder, providers a gas tight seal and ensures unidirectional gas flow
cylinder valve. allows cylinder to be filled and discharged
PISS. prevents wrong cylinder in wrong hanger yoke
gas inlet. (F)
airway pressure gauge. responds to pressure changes within the breathing system. can provide info such as increased airway pressure, circuit disconnect or airway obstruction
Adjustable Pressure Limiting Valve (APL). releases gases to a scavenging system. used to control pressures in the breathing system
anesthesia breathing bag. (adult= 3L)
1. The anesthesia breathing bags allow gas to accumulate during expiration. This provides a reservoir of gas for the next inspiration.
2. The bag allows ventilation to be spontaneous, assisted, or controlled.
3. It can serve as a visual or tactile monitor of spontaneous respirations.
4. Because it is the most distensible part of the breathing system, it protects patients from excessive pressure in the breathing system.
Two breathing tubes carry gases to and from the patient. Each tube is connected to inspiratory and expiratory ports on the absorber at one end with a Y piece on the other end. A large bore corrugated plastic breathing tube (hose) provides a flexible, low resistance, lightweight and disposable connection.
Y piece connector
three way connector with a 22-mm port for connection to a 15-mm patient connector for endotracheal tubes, supra glottis devices or masks
chemtron quick-coupled connector
Carbon dioxide (CO2) exhaled by the patient is removed as it passes through the absorbent.
Common Gas Outlet
receives all of the gases and vapors from the machine and delivers the mixture to the breathing system
cylinder pressure gauge
DISS (diameter index safety system)
makes it physically impossible to connect the wrong hose to the wrong pipeline
flow control knob
regulates the flow of oxygen, air and other gases to the flowmeters. The flow of gas is controlled by the ON-OFF function of the master switch
flowmeters (Thorpe Tube)
indicate the rate of flow of a gas passing through them
prevent more than one vaporizer from being turned on
switches from internal flow of gas to external flow of gas
switches from manual to mechanical ventilation
negative pressure relief valve of scavenging system
prevents vacuum (suction) from being transmitted to the breathing circuit
ohmeda quick-coupled connector
only device that detects a hypoxic mixture
O2 flush valve
works with the machine on or off. It supplies O2 directly to the common gas outlet at a flow rate of 35 to 75 liters per minute
pipeline pressure gauge
should read 50 psi
positive pressure relief valve in scavenging system
protect the patient from occlusion of the scavenging system. When the pressure in the scavenging interface exceeds 5 cm H2O pressure, this valve will open, allowing the gas to escape into the atmosphere.
pressure indicator gauge
reservoir bag of scavenging system
necessary to match the intermittent flow from the gas collecting assembly to the continuous flow from the disposal system. A distensible bag allows the gas removal by the scavenging system to be monitored. If the reservoir bag is over distended or collapsed flat, this indicates the scavenging system should be adjusted.
interface protects the patient from excessive buildup of positive pressure and from exposure to suction. There are two types of interfaces: closed and open.
select-a-tec mounting system
prevents wrong vaporizer placement
ensure that the gases flow towards the patient (inspiratory) in one breathing tube and away from the patient in the other (expiratory). A light, thin disc sits horizontally on top of the valve. The gas enters at the bottom and flows through the center of the valve, raising the disc from it seat.
(Inhalation opens the inspiratory unidirectional valve, allowing the patient to breath a mixture of fresh gas and exhaled gas that has passed through the carbon dioxide (CO2) absorber. Simultaneously, the expiratory valve closes to prevent rebreathing of the exhaled gas that still contains CO2. The subsequent flow of gas away from the patient during exhalation opens the expiratory valve and closes the inspiratory valve. The expired gas passes through the CO2 absorber and is rebreathed by the patient.)
vacuum control valve
changes a liquid anesthetic agent into a vapor and adds a controlled amount of vapor to the breathing system
are housed in a pressure chamber and the inside of the bellows is connected to the breathing system. During inspiration, drive gas (oxygen) is delivered to the space between the housing and the bellows. This causes the bellows to be compressed so that gas flows into the breathing system. At the same time, the spill valve (which vents excessive gas to the scavenging system) and the exhaust valve (which vents the drive gas) are closed. During exhalation, the bellows re-expand as the breathing system gases flow into it. The drive gas is exhausted to the atmosphere through the exhaust valve. After the bellows are fully expanded the excess gas from the breathing system is vented to the scavenging (gas disposal) system through the spill valve.
waste gas inlet
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