Exam 3- Anesthesia Machine I (7/11/23) Flashcards
What group oversees the standards of the anesthesia machine?
- American Society for Testing and Materials
What should the anesthesia machine do/provide?
- Provide accurate and safe gas delivery
- Provide a means for ventilating patients
- Provide electrical outlets
- Provide a housing for monitoring devices
- Provide storage/shelving
What features of the anesthesia works if the Master Switch is OFF?
- Battery charger
- Electrical outlets
- Oxygen flush valve is active
- Auxiliary oxygen flowmeter
Only if machine is plugged into electrical outlet
What is the best way to save power on your ventilator if you lose power during an operation?
- Switch from control ventilator to manual ventilation
What are the electrical outlets on the anesthesia machine used to power?
- Anesthesia monitors
- Other appliances should be plugged into hospital’s main outlets
- If requirements exceed outlet; circuit breaker will activate
What are the 3 parts of the pneumatic system?
- High Pressure
- Intermediate Pressure
- Low Pressure
The high-pressure system receives gas from the _______ at high variable pressure.
- Cylinders
The pressure needs to be reduced to a lower, more constant pressure suitable for use in the anesthesia machine
What is the purpose of the Hanger Yoke?
- Orients and support the cylinder
- Provide a gas-tight seal
- Ensures unidirectional flow
It is required to have one hanger yoke for oxygen and one hanger yoke for nitrous
What are the parts of the Hanger Yoke?
- Body- principal framework
- Retaining screw- tightens cylinder (clamp)
- Nipple- thru which gas enters the machine
- Index pins- prevents attaching an incorrect cylinder (PISS)
- Washer- forms seal between cylinder and yoke
- Check valve assembly- ensure unidirectional flow
What is the purpose of the check valve assembly of the hanger yoke?
- Ensures unidirectional flow
- Prevent gas from exiting the machine when there is no cylinder in the yoke
- Prevent gas from being transferred from a cylinder with higher pressure to one with lower pressure
How do cylinder pressure indicators work?
- The Bourdon gauge consists of a tube bent into a coil or an arc.
- As the pressure in the tube increases, the coil unwinds/straightens.
- A pointer connected to the end of the tube can be attached to a lever and a pointer calibrated to indicate pressure.
Gauge required to be calibrated to kPa or psi
What is the purpose of pressure regulators?
- Reduce high, variable pressure in cylinders to lower constant pressure for the machine.
- One pressure regulator must be present for each cylinder
Pressure regulators are also called reducing valves
What were the components of the high-pressure system?
- Cylinder
- Hanger Yoke
- Bourdon Gauge
- Pressure Reducing Valve (Pressure regulator)
Where does the intermediate system get its pressure from?
- Receives pressure from the pressure regulator (45 psi 1st stage regulator)
- Receives pressure from the pipeline (50-55 psi)
What is the intermediate pressure system pressure if the master switch is OFF?
- 0 mmHg
What is included in the intermediate pressure system?
- Pneumatic part of the master switch
- Pipeline inlet connections
- Piping
- Oxygen pressure failure devices
- Oxygen flush valve
- Flow control valves